pgbouncer / Pgbouncer
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PgBouncer
Lightweight connection pooler for PostgreSQL.
Homepage: https://www.pgbouncer.org/
Sources, bug tracking: https://github.com/pgbouncer/pgbouncer
Building
PgBouncer depends on few things to get compiled:
- GNU Make 3.81+
- Libevent 2.0+
- pkg-config
- OpenSSL 1.0.1+ for TLS support
- (optional) c-ares as alternative to Libevent's evdns
- (optional) PAM libraries
When dependencies are installed just run:
$ ./configure --prefix=/usr/local
$ make
$ make install
If you are building from Git, or are building for Windows, please see separate build instructions below.
DNS lookup support
PgBouncer does host name lookups at connect time instead of just once at configuration load time. This requires an asynchronous DNS implementation. The following table 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-glibc |
| getaddrinfo, libc | no | yes (3) | yes | no | requires pthreads |
- EDNS0 is required to have more than 8 addresses behind one host name.
- SOA lookup is needed to re-check host names on zone serial change.
- To enable EDNS0, add
options edns0to/etc/resolv.conf.
c-ares is the most fully-featured implementation and is recommended for most uses and binary packaging (if a sufficiently new version is available). Libevent's built-in evdns is also suitable for many uses, with the listed restrictions. The other backends are mostly legacy options at this point and don't receive much testing anymore.
By default, c-ares is used if it can be found. Its use can be forced
with configure --with-cares or disabled with --without-cares. If
c-ares is not used (not found or disabled), then specify --with-udns
to pick udns, else Libevent is used. Specify --disable-evdns to
disable the use of Libevent's evdns and fall back to a libc-based
implementation.
PAM authentication
To enable PAM authentication, ./configure has a flag --with-pam
(default value is no). When compiled with PAM support, a new global
authentication type pam is available to validate users through PAM.
systemd integration
To enable systemd integration, use the configure option
--with-systemd. This allows using Type=notify service units as
well as socket activation. See etc/pgbouncer.service and
etc/pgbouncer.socket for examples.
Building from Git
Building PgBouncer from Git requires that you fetch the libusual
submodule and generate the header and configuration 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, pandoc
Building on Windows
The only supported build environment on Windows is MinGW. Cygwin and Visual $ANYTHING are not supported.
To build on MinGW, do the usual:
$ ./configure ...
$ make
If cross-compiling from Unix:
$ ./configure --host=i586-mingw32msvc ...
Running on Windows
Running from the command line goes as usual, except that the -d (daemonize),
-R (reboot), and -u (switch user) switches will not work.
To run PgBouncer as a Windows service, you need to configure the
service_name parameter to set name for service. Then:
$ pgbouncer -regservice config.ini
To uninstall service:
$ pgbouncer -unregservice config.ini
To use the Windows event log, set syslog = 1 in the configuration file.
But before that you need to register pgbevent.dll:
$ regsvr32 pgbevent.dll
To unregister it, do:
$ regsvr32 /u pgbevent.dll