Patroni has a command-line interface named patronictl , which is used basically to interact with Patroni’s REST API and with the DCS. It is intended to make it easier to perform operations in the cluster, and can easily be used by humans or scripts.

Configuration

patronictl uses 3 sections of the configuration:

  • ctl : how to authenticate against the Patroni REST API, and how to validate the server identity. Refer to ctl settings for more details;

  • restapi : how to authenticate against the Patroni REST API, and how to validate the server identity. Only used if ctl configuration is not enough. patronictl is mainly interested in restapi.authentication section (in case ctl.authentication is missing) and restapi.cafile setting (in case ctl.cacert is missing). Refer to REST API settings for more details;

  • DCS (e.g. etcd ): how to contact and authenticate against the DCS used by Patroni.

Those configuration options can come either from environment variables or from a configuration file. Look for the above sections in Environment Configuration Settings or YAML Configuration Settings to understand how you can set the options for them through environment variables or through a configuration file.

If you opt for using environment variables, it’s a straight forward approach. Patronictl will read the environment variables and use their values.

If you opt for using a configuration file, you have different ways to inform patronictl about the file to be used. By default patronictl will attempt to load a configuration file named patronictl.yaml , which is expected to be found under either of these paths, according to your system:

  • Mac OS X: ~/Library/Application Support/patroni

  • Mac OS X (POSIX): ~/.patroni

  • Unix: ~/.config/patroni

  • Unix (POSIX): ~/.patroni

  • Windows (roaming): C:\Users\\AppData\Roaming\patroni

  • Windows (not roaming): C:\Users\\AppData\Local\patroni

You can override that behavior either by:

  • Setting the environment variable PATRONICTL_CONFIG_FILE with the path to a custom configuration file;

  • Using the -c / --config-file command-line argument of patronictl with the path to a custom configuration file.

Note

If you are running patronictl in the same host as patroni daemon is running, you may just use the same configuration file if it contains all the configuration sections required by patronictl .

Usage

patronictl exposes several handy operations. This section is intended to describe each of them.

Before jumping into each of the sub-commands of patronictl , be aware that patronictl itself has the following command-line arguments:

-c / --config-file

As explained before, used to provide a path to a configuration file for patronictl .

-d / --dcs-url / --dcs

Provide a connection string to the DCS used by Patroni.

This argument can be used either to override the DCS and namespace settings from the patronictl configuration, or to define it if it’s missing in the configuration.

The value should be in the format DCS://HOST:PORT/NAMESPACE , e.g. etcd3://localhost:2379/service to connect to etcd v3 running on localhost with Patroni cluster stored under service namespace. Any part that is missing in the argument value will be replaced with the value present in the configuration or with its default.

-k / --insecure

Flag to bypass validation of REST API server SSL certificate.

This is the synopsis for running a command from the patronictl : 

patronictl [ { -c | --config-file } CONFIG_FILE ]
  [ { -d | --dcs-url | --dcs } DCS_URL ]
  [ { -k | --insecure } ]
  SUBCOMMAND

Note

This is the syntax for the synopsis:

  • Options between square brackets are optional;

  • Options between curly brackets represent a "choose one of set" operation;

  • Options with [, ... ] can be specified multiple times;

  • Things written in uppercase represent a literal that should be given a value to.

We will use this same syntax when describing patronictl sub-commands in the following sub-sections. Also, when describing sub-commands in the following sub-sections, the commands’ synposis should be seen as a replacement for the SUBCOMMAND in the above synopsis.

In the following sub-sections you can find a description of each command implemented by patronictl . For sake of example, we will use the configuration files present in the GitHub repository of Patroni (files postgres0.yml , postgres1.yml and postgres2.yml ).

patronictl dsn

Synopsis 

dsn
  [ CLUSTER_NAME ]
  [ { { -r | --role } { leader | primary | standby-leader | replica | standby | any } | { -m | --member } MEMBER_NAME } ]
  [ --group CITUS_GROUP ]

Description

patronictl dsn gets the connection string for one member of the Patroni cluster.

If multiple members match the parameters of this command, one of them will be chosen, prioritizing the primary node.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

-r / --role

Choose a member that has the given role.

Role can be one of:

  • leader : the leader of either a regular Patroni cluster or a standby Patroni cluster; or

  • primary : the leader of a regular Patroni cluster; or

  • standby-leader : the leader of a standby Patroni cluster; or

  • replica : a replica of a Patroni cluster; or

  • standby : same as replica ; or

  • any : any role. Same as omitting this parameter; or

-m / --member

Choose a member of the cluster with the given name.

MEMBER_NAME is the name of the member.

--group

Choose a member that is part of the given Citus group.

CITUS_GROUP is the ID of the Citus group.

Examples

Get DSN of the primary node: 

$ patronictl -c postgres0.yml dsn batman -r primary
host=127.0.0.1 port=5432

Get DSN of the node named postgresql1 : 

$ patronictl -c postgres0.yml dsn batman --member postgresql1
host=127.0.0.1 port=5433

patronictl edit-config

Synopsis 

edit-config
  [ CLUSTER_NAME ]
  [ --group CITUS_GROUP ]
  [ { -q | --quiet } ]
  [ { -s | --set } CONFIG="VALUE" [, ... ] ]
  [ { -p | --pg } PG_CONFIG="PG_VALUE" [, ... ] ]
  [ { --apply | --replace } CONFIG_FILE ]
  [ --force ]

Description

patronictl edit-config changes the dynamic configuration of the cluster and updates the DCS with that.

Note

When invoked through a TTY the command attempts to show a diff of the dynamic configuration through a pager. By default, it attempts to use either less or more . If you want a different pager, set the PAGER environment variable with the desired one.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Change dynamic configuration of the given Citus group.

If not given, patronictl will attempt to fetch that from the citus.group configuration, if it exists.

CITUS_GROUP is the ID of the Citus group.

-q / --quiet

Flag to skip showing the configuration diff.

-s / --set

Set a given dynamic configuration option with a given value.

CONFIG is the name of the dynamic configuration path in the YAML tree, with levels joined by . .

VALUE is the value for CONFIG . If it is null , then CONFIG will be removed from the dynamic configuration.

-p / --pg

Set a given dynamic Postgres configuration option with the given value.

It is essentially a shorthand for --s / --set with CONFIG prepended with postgresql.parameters. .

PG_CONFIG is the name of the Postgres configuration to be set.

PG_VALUE is the value for PG_CONFIG . If it is nulll , then PG_CONFIG will be removed from the dynamic configuration.

--apply

Apply dynamic configuration from the given file.

It is similar to specifying multiple -s / --set options, one for each configuration from CONFIG_FILE .

CONFIG_FILE is the path to a file containing the dynamic configuration to be applied, in YAML format. Use - if you want to read from stdin .

--replace

Replace the dynamic configuration in the DCS with the dynamic configuration specified in the given file.

CONFIG_FILE is the path to a file containing the new dynamic configuration to take effect, in YAML format. Use - if you want to read from stdin .

--force

Flag to skip confirmation prompts when changing the dynamic configuration.

Useful for scripts.

Examples

Change max_connections Postgres GUC: 

patronictl -c postgres0.yml edit-config batman --pg max_connections="150" --force
---
+++
@@ -1,6 +1,8 @@
loop_wait: 10
maximum_lag_on_failover: 1048576
postgresql:
+  parameters:
+    max_connections: 150
  pg_hba:
  - host replication replicator 127.0.0.1/32 md5
  - host all all 0.0.0.0/0 md5

Configuration changed

Change loop_wait and ttl settings: 

patronictl -c postgres0.yml edit-config batman --set loop_wait="15" --set ttl="45" --force
---
+++
@@ -1,4 +1,4 @@
-loop_wait: 10
+loop_wait: 15
maximum_lag_on_failover: 1048576
postgresql:
  pg_hba:
@@ -6,4 +6,4 @@
  - host all all 0.0.0.0/0 md5
  use_pg_rewind: true
retry_timeout: 10
-ttl: 30
+ttl: 45

Configuration changed

Remove maximum_lag_on_failover setting from dynamic configuration: 

patronictl -c postgres0.yml edit-config batman --set maximum_lag_on_failover="null" --force
---
+++
@@ -1,5 +1,4 @@
loop_wait: 10
-maximum_lag_on_failover: 1048576
postgresql:
  pg_hba:
  - host replication replicator 127.0.0.1/32 md5

Configuration changed

patronictl failover

Synopsis 

failover
  [ CLUSTER_NAME ]
  [ --group CITUS_GROUP ]
  [ { --leader | --primary } LEADER_NAME ]
  --candidate CANDIDATE_NAME
  [ --force ]

Description

patronictl failover performs a manual failover in the cluster.

It is designed to be used when the cluster is not healthy, e.g.:

  • There is no leader; or

  • There is no synchronous standby available in a synchronous cluster.

It also allows to fail over to an asynchronous node if synchronous mode is enabled.

Note

Nothing prevents you from running patronictl failover in a healthy cluster. However, we recommend using patronictl switchover in those cases.

Warning

Triggering a failover can cause data loss depending on how up-to-date the promoted replica is in comparison to the primary.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Perform a failover in the given Citus group.

CITUS_GROUP is the ID of the Citus group.

--leader / --primary

Indicate who is the expected leader at failover time.

If given, a switchover is performed instead of a failover.

LEADER_NAME should match the name of the current leader in the cluster.

Warning

This argument is deprecated and will be removed in a future release.

--candidate

The node to be promoted on failover.

CANDIDATE_NAME is the name of the node to be promoted.

--force

Flag to skip confirmation prompts when performing the failover.

Useful for scripts.

Examples

Fail over to node postgresql2 : 

$ patronictl -c postgres0.yml failover batman --candidate postgresql2 --force
Current cluster topology
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  3 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  3 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  3 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
2023-09-12 11:52:27.50978 Successfully failed over to "postgresql2"
+ Cluster: batman (7277694203142172922) -+---------+----+-----------+
| Member      | Host           | Role    | State   | TL | Lag in MB |
+-------------+----------------+---------+---------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Replica | stopped |    |   unknown |
| postgresql1 | 127.0.0.1:5433 | Replica | running |  3 |         0 |
| postgresql2 | 127.0.0.1:5434 | Leader  | running |  3 |           |
+-------------+----------------+---------+---------+----+-----------+

patronictl flush

Synopsis 

flush
  CLUSTER_NAME
  [ MEMBER_NAME [, ... ] ]
  { restart | switchover }
  [ --group CITUS_GROUP ]
  [ { -r | --role } { leader | primary | standby-leader | replica | standby | any } ]
  [ --force ]

Description

patronictl flush discards scheduled events, if any.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

MEMBER_NAME

Discard scheduled events for the given Patroni member(s).

Multiple members can be specified. If no members are specified, all of them are considered.

Note

Only used if discarding scheduled restart events.

restart

Discard scheduled restart events.

switchover

Discard scheduled switchover event.

--group

Discard scheduled events from the given Citus group.

CITUS_GROUP is the ID of the Citus group.

-r / --role

Discard scheduled events for members that have the given role.

Role can be one of:

  • leader : the leader of either a regular Patroni cluster or a standby Patroni cluster; or

  • primary : the leader of a regular Patroni cluster; or

  • standby-leader : the leader of a standby Patroni cluster; or

  • replica : a replica of a Patroni cluster; or

  • standby : same as replica ; or

  • any : any role. Same as omitting this parameter.

Note

Only used if discarding scheduled restart events.

--force

Flag to skip confirmation prompts when performing the flush.

Useful for scripts.

Examples

Discard a scheduled switchover event: 

$ patronictl -c postgres0.yml flush batman switchover --force
Success: scheduled switchover deleted

Discard scheduled restart of all standby nodes: 

$ patronictl -c postgres0.yml flush batman restart -r replica --force
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+---------------------------+
| Member      | Host           | Role    | State     | TL | Lag in MB | Scheduled restart         |
+-------------+----------------+---------+-----------+----+-----------+---------------------------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  5 |           | 2023-09-12T17:17:00+00:00 |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  5 |         0 | 2023-09-12T17:17:00+00:00 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  5 |         0 | 2023-09-12T17:17:00+00:00 |
+-------------+----------------+---------+-----------+----+-----------+---------------------------+
Success: flush scheduled restart for member postgresql1
Success: flush scheduled restart for member postgresql2

Discard scheduled restart of nodes postgresql0 and postgresql1 : 

$ patronictl -c postgres0.yml flush batman postgresql0 postgresql1 restart --force
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+---------------------------+
| Member      | Host           | Role    | State     | TL | Lag in MB | Scheduled restart         |
+-------------+----------------+---------+-----------+----+-----------+---------------------------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  5 |           | 2023-09-12T17:17:00+00:00 |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  5 |         0 | 2023-09-12T17:17:00+00:00 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  5 |         0 | 2023-09-12T17:17:00+00:00 |
+-------------+----------------+---------+-----------+----+-----------+---------------------------+
Success: flush scheduled restart for member postgresql0
Success: flush scheduled restart for member postgresql1

patronictl history

Synopsis 

history
  [ CLUSTER_NAME ]
  [ --group CITUS_GROUP ]
  [ { -f | --format } { pretty | tsv | json | yaml } ]

Description

patronictl history shows a history of failover and switchover events from the cluster, if any.

The following information is included in the output:

TL

Postgres timeline at which the event occurred.

LSN

Postgres LSN at which the event occurred.

Reason

Reason fetched from the Postgres .history file.

Timestamp

Time when the event occurred.

New Leader

Patroni member that has been promoted during the event.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Show history of events from the given Citus group.

CITUS_GROUP is the ID of the Citus group.

If not given, patronictl will attempt to fetch that from the citus.group configuration, if it exists.

-f / --format

How to format the list of events in the output.

Format can be one of:

  • pretty : prints history as a pretty table; or

  • tsv : prints history as tabular information, with columns delimited by \t ; or

  • json : prints history in JSON format; or

  • yaml : prints history in YAML format.

The default is pretty .

--force

Flag to skip confirmation prompts when performing the flush.

Useful for scripts.

Examples

Show the history of events: 

$ patronictl -c postgres0.yml history batman
+----+----------+------------------------------+----------------------------------+-------------+
| TL |      LSN | Reason                       | Timestamp                        | New Leader  |
+----+----------+------------------------------+----------------------------------+-------------+
|  1 | 24392648 | no recovery target specified | 2023-09-11T22:11:27.125527+00:00 | postgresql0 |
|  2 | 50331864 | no recovery target specified | 2023-09-12T11:34:03.148097+00:00 | postgresql0 |
|  3 | 83886704 | no recovery target specified | 2023-09-12T11:52:26.948134+00:00 | postgresql2 |
|  4 | 83887280 | no recovery target specified | 2023-09-12T11:53:09.620136+00:00 | postgresql0 |
+----+----------+------------------------------+----------------------------------+-------------+

Show the history of events in YAML format: 

$ patronictl -c postgres0.yml history batman -f yaml
- LSN: 24392648
  New Leader: postgresql0
  Reason: no recovery target specified
  TL: 1
  Timestamp: '2023-09-11T22:11:27.125527+00:00'
- LSN: 50331864
  New Leader: postgresql0
  Reason: no recovery target specified
  TL: 2
  Timestamp: '2023-09-12T11:34:03.148097+00:00'
- LSN: 83886704
  New Leader: postgresql2
  Reason: no recovery target specified
  TL: 3
  Timestamp: '2023-09-12T11:52:26.948134+00:00'
- LSN: 83887280
  New Leader: postgresql0
  Reason: no recovery target specified
  TL: 4
  Timestamp: '2023-09-12T11:53:09.620136+00:00'

patronictl list

Synopsis 

list
  [ CLUSTER_NAME [, ... ] ]
  [ --group CITUS_GROUP ]
  [ { -e | --extended } ]
  [ { -t | --timestamp } ]
  [ { -f | --format } { pretty | tsv | json | yaml } ]
  [ { -W | { -w | --watch } TIME } ]

Description

patronictl list shows information about Patroni cluster and its members.

The following information is included in the output:

Cluster

Name of the Patroni cluster.

Member

Name of the Patroni member.

Host

Host where the member is located.

Role

Current role of the member.

Can be one among:

  • Leader : the current leader of a regular Patroni cluster; or

  • Standby Leader : the current leader of a Patroni standby cluster; or

  • Sync Standby : a synchronous standby of a Patroni cluster with synchronous mode enabled; or

  • Replica : a regular standby of a Patroni cluster.

State

Current state of Postgres in the Patroni member.

Some examples among the possible states:

  • running : if Postgres is currently up and running;

  • streaming : if a replica and Postgres is currently streaming WALs from the primary node;

  • in archive recovery : if a replica and Postgres is currently fetching WALs from the archive;

  • stopped : if Postgres had been shut down;

  • crashed : if Postgres has crashed.

TL

Current Postgres timeline in the Patroni member.

Lag in MB

Amount worth of replication lag in megabytes between the Patroni member and its upstream.

Besides that, the following information may be included in the output:

System identifier

Postgres system identifier.

Note

Shown in the table header.

Only shown if output format is pretty .

Group

Citus group ID.

Note

Shown in the table header.

Only shown if a Citus cluster.

Pending restart

* indicates that the node needs a restart for some Postgres configuration to take effect. An empty value indicates the node does not require a restart.

Note

Shown as a member attribute.

Shown if:

  • Printing in pretty or tsv format and with extended output enabled; or

  • If node requires a restart.

Scheduled restart

Timestamp at which a restart has been scheduled for the Postgres instance managed by the Patroni member. An empty value indicates there is no scheduled restart for the member.

Note

Shown as a member attribute.

Shown if:

  • Printing in pretty or tsv format and with extended output enabled; or

  • If node has a scheduled restart.

Tags

Contains tags set for the Patroni member. An empty value indicates that either no tags have been configured, or that they have been configured with default values.

Note

Shown as a member attribute.

Shown if:

  • Printing in pretty or tsv format and with extended output enabled; or

  • If node has any custom tags, or any default tags with non-default values.

Scheduled switchover

Timestamp at which a switchover has been scheduled for the Patroni cluster, if any.

Note

Shown in the table footer.

Only shown if there is a scheduled switchover, and output format is pretty .

Maintenance mode

If the cluster monitoring is currently paused.

Note

Shown in the table footer.

Only shown if the cluster is paused, and output format is pretty .

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Show information about members from the given Citus group.

CITUS_GROUP is the ID of the Citus group.

-e / --extended

Show extended information.

Force showing Pending restart , Scheduled restart and Tags attributes, even if their value is empty.

Note

Only applies to pretty and tsv output formats.

-t / --timestamp

Print timestamp before printing information about the cluster and its members.

-f / --format

How to format the list of events in the output.

Format can be one of:

  • pretty : prints history as a pretty table; or

  • tsv : prints history as tabular information, with columns delimited by \t ; or

  • json : prints history in JSON format; or

  • yaml : prints history in YAML format.

The default is pretty .

-W

Automatically refresh information every 2 seconds.

-w / --watch

Automatically refresh information at the specified interval.

TIME is the interval between refreshes, in seconds.

Examples

Show information about the cluster in pretty format: 

$ patronictl -c postgres0.yml list batman
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  5 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  5 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  5 |         0 |
+-------------+----------------+---------+-----------+----+-----------+

Show information about the cluster in pretty format with extended columns: 

$ patronictl -c postgres0.yml list batman -e
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+-----------------+-------------------+------+
| Member      | Host           | Role    | State     | TL | Lag in MB | Pending restart | Scheduled restart | Tags |
+-------------+----------------+---------+-----------+----+-----------+-----------------+-------------------+------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  5 |           |                 |                   |      |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  5 |         0 |                 |                   |      |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  5 |         0 |                 |                   |      |
+-------------+----------------+---------+-----------+----+-----------+-----------------+-------------------+------+

Show information about the cluster in YAML format, with timestamp of execution: 

$ patronictl -c postgres0.yml list batman -f yaml -t
2023-09-12 13:30:48
- Cluster: batman
  Host: 127.0.0.1:5432
  Member: postgresql0
  Role: Leader
  State: running
  TL: 5
- Cluster: batman
  Host: 127.0.0.1:5433
  Lag in MB: 0
  Member: postgresql1
  Role: Replica
  State: streaming
  TL: 5
- Cluster: batman
  Host: 127.0.0.1:5434
  Lag in MB: 0
  Member: postgresql2
  Role: Replica
  State: streaming
  TL: 5

patronictl pause

Synopsis 

pause
  [ CLUSTER_NAME ]
  [ --group CITUS_GROUP ]
  [ --wait ]

Description

patronictl pause temporarily puts the Patroni cluster in maintenance mode and disables automatic failover.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Pause the given Citus group.

CITUS_GROUP is the ID of the Citus group.

If not given, patronictl will attempt to fetch that from the citus.group configuration, if it exists.

--wait

Wait until all Patroni members are paused before returning control to the caller.

Examples

Put the cluster in maintenance mode, and wait until all nodes have been paused: 

$ patronictl -c postgres0.yml pause batman --wait
'pause' request sent, waiting until it is recognized by all nodes
Success: cluster management is paused

patronictl query

Synopsis 

query
  [ CLUSTER_NAME ]
  [ --group CITUS_GROUP ]
  [ { { -r | --role } { leader | primary | standby-leader | replica | standby | any } | { -m | --member } MEMBER_NAME } ]
  [ { -d | --dbname } DBNAME ]
  [ { -U | --username } USERNAME ]
  [ --password ]
  [ --format { pretty | tsv | json | yaml } ]
  [ { { -f | --file } FILE_NAME | { -c | --command } SQL_COMMAND } ]
  [ --delimiter ]
  [ { -W | { -w | --watch } TIME } ]

Description

patronictl query executes a SQL command or script against a member of the Patroni cluster.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Query the given Citus group.

CITUS_GROUP is the ID of the Citus group.

-r / --role

Choose a member that has the given role.

Role can be one of:

  • leader : the leader of either a regular Patroni cluster or a standby Patroni cluster; or

  • primary : the leader of a regular Patroni cluster; or

  • standby-leader : the leader of a standby Patroni cluster; or

  • replica : a replica of a Patroni cluster; or

  • standby : same as replica ; or

  • any : any role. Same as omitting this parameter.

-m / --member

Choose a member that has the given name.

MEMBER_NAME is the name of the member to be picked.

-d / --dbname

Database to connect and run the query.

DBNAME is the name of the database. If not given, defaults to USERNAME .

-U / --username

User to connect to the database.

USERNAME name of the user. If not given, defaults to the operating system user running patronictl query .

--password

Prompt for the password of the connecting user.

As Patroni uses libpq , alternatively you can create a ~/.pgpass file or set the PGPASSWORD environment variable.

--format

How to format the output of the query.

Format can be one of:

  • pretty : prints query output as a pretty table; or

  • tsv : prints query output as tabular information, with columns delimited by \t ; or

  • json : prints query output in JSON format; or

  • yaml : prints query output in YAML format.

The default is tsv .

-f / --file

Use a file as source of commands to run queries.

FILE_NAME is the path to the source file.

-c / --command

Run the given SQL command in the query.

SQL_COMMAND is the SQL command to be executed.

--delimiter

The delimiter when printing information in tsv format, or \t if omitted.

-W

Automatically re-run the query every 2 seconds.

-w / --watch

Automatically re-run the query at the specified interval.

TIME is the interval between re-runs, in seconds.

Examples

Run a SQL command as postgres user, and ask for its password: 

$ patronictl -c postgres0.yml query batman -U postgres --password -c "SELECT now()"
Password:
now
2023-09-12 18:10:53.228084+00:00

Run a SQL command as postgres user, and take password from libpq environment variable: 

$ PGPASSWORD=zalando patronictl -c postgres0.yml query batman -U postgres -c "SELECT now()"
now
2023-09-12 18:11:37.639500+00:00

Run a SQL command and print in pretty format every 2 seconds: 

$ patronictl -c postgres0.yml query batman -c "SELECT now()" --format pretty -W
+----------------------------------+
| now                              |
+----------------------------------+
| 2023-09-12 18:12:16.716235+00:00 |
+----------------------------------+
+----------------------------------+
| now                              |
+----------------------------------+
| 2023-09-12 18:12:18.732645+00:00 |
+----------------------------------+
+----------------------------------+
| now                              |
+----------------------------------+
| 2023-09-12 18:12:20.750573+00:00 |
+----------------------------------+

Run a SQL command on database test and print the output in YAML format: 

$ patronictl -c postgres0.yml query batman -d test -c "SELECT now() AS column_1, 'test' AS column_2" --format yaml
- column_1: 2023-09-12 18:14:22.052060+00:00
  column_2: test

Run a SQL command on member postgresql2 : 

$ patronictl -c postgres0.yml query batman -m postgresql2 -c "SHOW port"
port
5434

Run a SQL command on any of the standbys: 

$ patronictl -c postgres0.yml query batman -r replica -c "SHOW port"
port
5433

patronictl reinit

Synopsis 

reinit
  CLUSTER_NAME
  [ MEMBER_NAME [, ... ] ]
  [ --group CITUS_GROUP ]
  [ --wait ]
  [ --force ]

Description

patronictl reinit rebuilds a Postgres standby instance managed by a replica member of the Patroni cluster.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

MEMBER_NAME

Name of the replica member for which the Postgres instance will be rebuilt.

Multiple replica members can be specified. If no members are specified, the command does nothing.

--group

Rebuild a replica member of the given Citus group.

CITUS_GROUP is the ID of the Citus group.

--wait

Wait until the reinitialization of the Postgres standby node(s) is finished.

--force

Flag to skip confirmation prompts when rebuilding Postgres standby instances.

Useful for scripts.

Examples

Request a rebuild of all replica members of the Patroni cluster and immediately return control to the caller: 

$ patronictl -c postgres0.yml reinit batman postgresql1 postgresql2 --force
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  5 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  5 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  5 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
Success: reinitialize for member postgresql1
Success: reinitialize for member postgresql2

Request a rebuild of postgresql2 and wait for it to complete: 

$ patronictl -c postgres0.yml reinit batman postgresql2 --wait --force
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  5 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  5 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  5 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
Success: reinitialize for member postgresql2
Waiting for reinitialize to complete on: postgresql2
Reinitialize is completed on: postgresql2

patronictl reload

Synopsis 

reload
  CLUSTER_NAME
  [ MEMBER_NAME [, ... ] ]
  [ --group CITUS_GROUP ]
  [ { -r | --role } { leader | primary | standby-leader | replica | standby | any } ]
  [ --force ]

Description

patronictl reload requests a reload of local configuration for one or more Patroni members.

It also triggers pg_ctl reload on the managed Postgres instance, even if nothing has changed.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

MEMBER_NAME

Request a reload of local configuration for the given Patroni member(s).

Multiple members can be specified. If no members are specified, all of them are considered.

--group

Request a reload of members of the given Citus group.

CITUS_GROUP is the ID of the Citus group.

-r / --role

Select members that have the given role.

Role can be one of:

  • leader : the leader of either a regular Patroni cluster or a standby Patroni cluster; or

  • primary : the leader of a regular Patroni cluster; or

  • standby-leader : the leader of a standby Patroni cluster; or

  • replica : a replica of a Patroni cluster; or

  • standby : same as replica ; or

  • any : any role. Same as omitting this parameter.

--force

Flag to skip confirmation prompts when requesting a reload of the local configuration.

Useful for scripts.

Examples

Request a reload of the local configuration of all members of the Patroni cluster: 

$ patronictl -c postgres0.yml reload batman --force
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  5 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  5 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  5 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
Reload request received for member postgresql0 and will be processed within 10 seconds
Reload request received for member postgresql1 and will be processed within 10 seconds
Reload request received for member postgresql2 and will be processed within 10 seconds

patronictl remove

Synopsis 

remove
  CLUSTER_NAME
  [ --group CITUS_GROUP ]
  [ { -f | --format } { pretty | tsv | json | yaml } ]

Description

patronictl remove removes information of the cluster from the DCS.

It is an interactive action.

Warning

This operation will destroy the information of the Patroni cluster from the DCS.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

--group

Remove information about the Patroni cluster related with the given Citus group.

CITUS_GROUP is the ID of the Citus group.

-f / --format

How to format the list of members in the output when prompting for confirmation.

Format can be one of:

  • pretty : prints members as a pretty table; or

  • tsv : prints members as tabular information, with columns delimited by \t ; or

  • json : prints members in JSON format; or

  • yaml : prints members in YAML format.

The default is pretty .

Examples

Remove information about Patroni cluster batman from the DCS: 

$ patronictl -c postgres0.yml remove batman
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  5 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  5 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  5 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
Please confirm the cluster name to remove: batman
You are about to remove all information in DCS for batman, please type: "Yes I am aware": Yes I am aware
This cluster currently is healthy. Please specify the leader name to continue: postgresql0

patronictl restart

Synopsis 

restart
  CLUSTER_NAME
  [ MEMBER_NAME [, ...] ]
  [ --group CITUS_GROUP ]
  [ { -r | --role } { leader | primary | standby-leader | replica | standby | any } ]
  [ --any ]
  [ --pg-version PG_VERSION ]
  [ --pending ]
  [ --timeout TIMEOUT ]
  [ --scheduled TIMESTAMP ]
  [ --force ]

Description

patronictl restart requests a restart of the Postgres instance managed by a member of the Patroni cluster.

The restart can be performed immediately or scheduled for later.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

--group

Restart the Patroni cluster related with the given Citus group.

CITUS_GROUP is the ID of the Citus group.

-r / --role

Choose members that have the given role.

Role can be one of:

  • leader : the leader of either a regular Patroni cluster or a standby Patroni cluster; or

  • primary : the leader of a regular Patroni cluster; or

  • standby-leader : the leader of a standby Patroni cluster; or

  • replica : a replica of a Patroni cluster; or

  • standby : same as replica ; or

  • any : any role. Same as omitting this parameter.

--any

Restart a single random node among the ones which match the given filters.

--pg-version

Select only members which version of the managed Postgres instance is older than the given version.

PG_VERSION is the Postgres version to be compared.

--pending

Select only members which are flagged as Pending restart .

timeout

Abort the restart if it takes more than the specified timeout, and fail over to a replica if the issue is on the primary.

TIMEOUT is the amount of seconds to wait before aborting the restart.

--scheduled

Schedule a restart to occur at the given timestamp.

TIMESTAMP is the timestamp when the restart should occur. Specify it in unambiguous format, preferrably with time zone. You can also use the literal now for the restart to be executed immediately.

--force

Flag to skip confirmation prompts when requesting the restart operations.

Useful for scripts.

Examples

Restart all members of the cluster immediately: 

$ patronictl -c postgres0.yml restart batman --force
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  6 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  6 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  6 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
Success: restart on member postgresql0
Success: restart on member postgresql1
Success: restart on member postgresql2

Restart a random member of the cluster immediately: 

$ patronictl -c postgres0.yml restart batman --any --force
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  6 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  6 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  6 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
Success: restart on member postgresql1

Schedule a restart to occur at 2023-09-13T18:00-03:00 : 

$ patronictl -c postgres0.yml restart batman --scheduled 2023-09-13T18:00-03:00 --force
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  6 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  6 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  6 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
Success: restart scheduled on member postgresql0
Success: restart scheduled on member postgresql1
Success: restart scheduled on member postgresql2

patronictl resume

Synopsis 

resume
  [ CLUSTER_NAME ]
  [ --group CITUS_GROUP ]
  [ --wait ]

Description

patronictl resume takes the Patroni cluster out of maintenance mode and re-enables automatic failover.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Resume the given Citus group.

CITUS_GROUP is the ID of the Citus group.

If not given, patronictl will attempt to fetch that from the citus.group configuration, if it exists.

--wait

Wait until all Patroni members are unpaused before returning control to the caller.

Examples

Put the cluster out of maintenance mode: 

$ patronictl -c postgres0.yml resume batman --wait
'resume' request sent, waiting until it is recognized by all nodes
Success: cluster management is resumed

patronictl show-config

Synopsis 

show-config
  [ CLUSTER_NAME ]
  [ --group CITUS_GROUP ]

Description

patronictl show-config shows the dynamic configuration of the cluster that is stored in the DCS.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Show dynamic configuration of the given Citus group.

CITUS_GROUP is the ID of the Citus group.

If not given, patronictl will attempt to fetch that from the citus.group configuration, if it exists.

Examples

Show dynamic configuration of cluster batman : 

$ patronictl -c postgres0.yml show-config batman
loop_wait: 10
postgresql:
  parameters:
    max_connections: 250
  pg_hba:
  - host replication replicator 127.0.0.1/32 md5
  - host all all 0.0.0.0/0 md5
  use_pg_rewind: true
retry_timeout: 10
ttl: 30

patronictl switchover

Synopsis 

switchover
  [ CLUSTER_NAME ]
  [ --group CITUS_GROUP ]
  [ { --leader | --primary } LEADER_NAME ]
  --candidate CANDIDATE_NAME
  [ --force ]

Description

patronictl switchover performs a switchover in the cluster.

It is designed to be used when the cluster is healthy, e.g.:

  • There is a leader;

  • There are synchronous standbys available in a synchronous cluster.

Note

If your cluster is unhealthy you might be interested in patronictl failover instead.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Perform a switchover in the given Citus group.

CITUS_GROUP is the ID of the Citus group.

--leader / --primary

Indicate who is the leader to be demoted at switchover time.

LEADER_NAME should match the name of the current leader in the cluster.

--candidate

The node to be promoted on switchover, and take the primary role.

CANDIDATE_NAME is the name of the node to be promoted.

--scheduled

Schedule a switchover to occur at the given timestamp.

TIMESTAMP is the timestamp when the switchover should occur. Specify it in unambiguous format, preferrably with time zone. You can also use the literal now for the switchover to be executed immediately.

--force

Flag to skip confirmation prompts when performing the switchover.

Useful for scripts.

Examples

Switch over with node postgresql2 : 

$ patronictl -c postgres0.yml switchover batman --leader postgresql0 --candidate postgresql2 --force
Current cluster topology
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  6 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  6 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  6 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
2023-09-13 14:15:23.07497 Successfully switched over to "postgresql2"
+ Cluster: batman (7277694203142172922) -+---------+----+-----------+
| Member      | Host           | Role    | State   | TL | Lag in MB |
+-------------+----------------+---------+---------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Replica | stopped |    |   unknown |
| postgresql1 | 127.0.0.1:5433 | Replica | running |  6 |         0 |
| postgresql2 | 127.0.0.1:5434 | Leader  | running |  6 |           |
+-------------+----------------+---------+---------+----+-----------+

Schedule a switchover between postgresql0 and postgresql2 to occur at 2023-09-13T18:00:00-03:00 : 

$ patronictl -c postgres0.yml switchover batman --leader postgresql0 --candidate postgresql2 --scheduled 2023-09-13T18:00-03:00 --force
Current cluster topology
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  8 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  8 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  8 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
2023-09-13 14:18:11.20661 Switchover scheduled
+ Cluster: batman (7277694203142172922) -+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   |  8 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming |  8 |         0 |
| postgresql2 | 127.0.0.1:5434 | Replica | streaming |  8 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
Switchover scheduled at: 2023-09-13T18:00:00-03:00
                    from: postgresql0
                    to: postgresql2

patronictl topology

Synopsis 

topology
  [ CLUSTER_NAME [, ... ] ]
  [ --group CITUS_GROUP ]
  [ { -W | { -w | --watch } TIME } ]

Description

patronictl topology shows information about the Patroni cluster and its members with a tree view approach.

The following information is included in the output:

Cluster

Name of the Patroni cluster.

Note

Shown in the table header.

System identifier

Postgres system identifier.

Note

Shown in the table header.

Member

Name of the Patroni member.

Note

Information in this column is shown as a tree view of members in terms of replication connections.

Host

Host where the member is located.

Role

Current role of the member.

Can be one among:

  • Leader : the current leader of a regular Patroni cluster; or

  • Standby Leader : the current leader of a Patroni standby cluster; or

  • Sync Standby : a synchronous standby of a Patroni cluster with synchronous mode enabled; or

  • Replica : a regular standby of a Patroni cluster.

State

Current state of Postgres in the Patroni member.

Some examples among the possible states:

  • running : if Postgres is currently up and running;

  • streaming : if a replica and Postgres is currently streaming WALs from the primary node;

  • in archive recovery : if a replica and Postgres is currently fetching WALs from the archive;

  • stopped : if Postgres had been shut down;

  • crashed : if Postgres has crashed.

TL

Current Postgres timeline in the Patroni member.

Lag in MB

Amount worth of replication lag in megabytes between the Patroni member and its upstream.

Besides that, the following information may be included in the output:

Group

Citus group ID.

Note

Shown in the table header.

Only shown if a Citus cluster.

Pending restart

* indicates the node needs a restart for some Postgres configuration to take effect. An empty value indicates the node does not require a restart.

Note

Shown as a member attribute.

Shown if node requires a restart.

Scheduled restart

Timestamp at which a restart has been scheduled for the Postgres instance managed by the Patroni member. An empty value indicates there is no scheduled restart for the member.

Note

Shown as a member attribute.

Shown if node has a scheduled restart.

Tags

Contains tags set for the Patroni member. An empty value indicates that either no tags have been configured, or that they have been configured with default values.

Note

Shown as a member attribute.

Shown if node has any custom tags, or any default tags with non-default values.

Scheduled switchover

Timestamp at which a switchover has been scheduled for the Patroni cluster, if any.

Note

Shown in the table footer.

Only shown if there is a scheduled switchover.

Maintenance mode

If the cluster monitoring is currently paused.

Note

Shown in the table footer.

Only shown if the cluster is paused.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

If not given, patronictl will attempt to fetch that from the scope configuration, if it exists.

--group

Show information about members from the given Citus group.

CITUS_GROUP is the ID of the Citus group.

-W

Automatically refresh information every 2 seconds.

-w / --watch

Automatically refresh information at the specified interval.

TIME is the interval between refreshes, in seconds.

Examples

Show topology of the cluster batman – postgresql1 and postgresql2 are replicating from postgresql0 : 

$ patronictl -c postgres0.yml topology batman
+ Cluster: batman (7277694203142172922) ---+-----------+----+-----------+
| Member        | Host           | Role    | State     | TL | Lag in MB |
+---------------+----------------+---------+-----------+----+-----------+
| postgresql0   | 127.0.0.1:5432 | Leader  | running   |  8 |           |
| + postgresql1 | 127.0.0.1:5433 | Replica | streaming |  8 |         0 |
| + postgresql2 | 127.0.0.1:5434 | Replica | streaming |  8 |         0 |
+---------------+----------------+---------+-----------+----+-----------+

patronictl version

Synopsis 

version
  [ CLUSTER_NAME [, ... ] ]
  [ MEMBER_NAME [, ... ] ]
  [ --group CITUS_GROUP ]

Description

patronictl version gets the version of patronictl application. Besides that it may also include version information about Patroni clusters and their members.

Parameters

CLUSTER_NAME

Name of the Patroni cluster.

MEMBER_NAME

Name of the member of the Patroni cluster.

--group

Consider a Patroni cluster with the given Citus group.

CITUS_GROUP is the ID of the Citus group.

Examples

Get version of patronictl only: 

$ patronictl -c postgres0.yml version
patronictl version 3.1.0

Get version of patronictl and of all members of cluster batman : 

$ patronictl -c postgres0.yml version batman
patronictl version 3.1.0

postgresql0: Patroni 3.1.0 PostgreSQL 15.2
postgresql1: Patroni 3.1.0 PostgreSQL 15.2
postgresql2: Patroni 3.1.0 PostgreSQL 15.2

Get version of patronictl and of members postgresql1 and postgresql2 of cluster batman : 

$ patronictl -c postgres0.yml version batman postgresql1 postgresql2
patronictl version 3.1.0

postgresql1: Patroni 3.1.0 PostgreSQL 15.2
postgresql2: Patroni 3.1.0 PostgreSQL 15.2