pgBouncer - A Lightweight Connection Pooler for PostgreSQL
Lightweight connection pooler for PostgreSQL.
PgBouncer depends on few things to get compiled:
- GNU Make 3.81+
- libevent 2.0
- (optional) OpenSSL 1.0.1 for TLS support.
- (optional) c-ares as alternative to libevent's evdns.
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|
|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|
- EDNS0 is required to have more than 8 addresses behind one hostname.
- SOA lookup is needed to re-check hostnames on zone serial change
- 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() .
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 https://github.com/pgbouncer/pgbouncer.git $ cd pgbouncer $ git submodule init $ git submodule update $ ./autogen.sh $ ./configure ... $ make $ make install
Additional packages required: autoconf, automake, 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