pgBouncer - A Lightweight Connection Pooler for PostgreSQL


Lightweight connection pooler for PostgreSQL.

Sources, bugtracking


PgBouncer depends on few things to get compiled:

When dependencies are installed just run:

$ ./configure --prefix=/usr/local --with-libevent=libevent-prefix
$ make
$ make install

If you are building from git, or are building for Windows, please see separate build instructions below.

DNS lookup support

Starting from PgBouncer 1.4, it does hostname lookups at connect time instead just once at config load time. This requires proper async DNS implementation. Following list shows supported backends and their probing order:

backend parallel EDNS0 (1) /etc/hosts SOA lookup (2) note
c-ares yes yes yes yes ipv6+CNAME buggy in <=1.10
udns yes yes no yes ipv4-only
evdns, libevent 2.x yes no yes no does not check /etc/hosts updates
getaddrinfo_a, glibc 2.9+ yes yes (3) yes no N/A on non-linux
getaddrinfo, libc no yes (3) yes no N/A on win32, requires pthreads
evdns, libevent 1.x yes no no no buggy
  1. EDNS0 is required to have more than 8 addresses behind one hostname.
  2. SOA lookup is needed to re-check hostnames on zone serial change
  3. To enable EDNS0, add options edns0 to /etc/resolv.conf

./configure also has flags --enable-evdns and --disable-evdns which turn off automatic probing and force use of either evdns or getaddrinfo_a() .

PAM authorization

To enable PAM authorization ./configure has a flag --with-pam (default value is no). When compiled with PAM support new global authorization type pam appears which can be used to validate users through PAM.

Building from GIT

Building PgBouncer from GIT requires that you fetch libusual submodule and generate the header and config files before you can run configure:

$ git clone
$ cd pgbouncer
$ git submodule init
$ git submodule update
$ ./
$ ./configure ...
$ make
$ make install

Additional packages required: autoconf, automake, libevent-dev, libtool, autoconf-archive, python-docutils, and pkg-config.

Building for WIN32

At the moment only build env tested is MINGW32 / MSYS. Cygwin and Visual $ANYTHING are untested. Libevent 2.x is required for DNS hostname lookup.

Then do the usual:

$ ./configure ...
$ make

If cross-compiling from Unix:

$ ./configure --host=i586-mingw32msvc ...

Running on WIN32

Running from command-line goes as usual, except -d (daemonize), -R (reboot) and -u (switch user) switches will not work.

To run pgbouncer as a Windows service, you need to configure service_name parameter to set name for service. Then:

$ pgbouncer -regservice config.ini

To uninstall service:

$ pgbouncer -unregservice config.ini

To use Windows Event Log, set "syslog = 1" in config file. But before you need to register pgbevent.dll:

$ regsvr32 pgbevent.dll

To unregister it, do:

$ regsvr32 /u pgbevent.dll