安装配置PgBouncer for PostgreSQL

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1、安装pgbounce

PgBounce的安装有两种方式，源代码安装和安装rpm二进制软件包。这里使用rpm软件安装，如下：

[root@hdp06 ~]# yum -y install pgbouncer 
[root@hdp06 ~]# rpm -ql pgbouncer
/etc/logrotate.d/pgbouncer
/etc/pgbouncer
/etc/pgbouncer/mkauth.py
/etc/pgbouncer/mkauth.pyc
/etc/pgbouncer/mkauth.pyo
/etc/pgbouncer/pgbouncer.ini
/etc/sysconfig/pgbouncer
/usr/bin/pgbouncer
/usr/lib/systemd/system/pgbouncer.service
/usr/lib/tmpfiles.d/pgbouncer.conf
/usr/share/doc/pgbouncer
/usr/share/doc/pgbouncer/NEWS.rst
/usr/share/doc/pgbouncer/README.rst
/usr/share/doc/pgbouncer/pgbouncer.ini
/usr/share/doc/pgbouncer/userlist.txt
/usr/share/licenses/pgbouncer-1.9.0
/usr/share/licenses/pgbouncer-1.9.0/COPYRIGHT
/usr/share/man/man1/pgbouncer.1.gz
/usr/share/man/man5/pgbouncer.5.gz
/var/run/pgbouncer

2、配置pgbounce

编辑配置文件，修改以下内容：

[databases]
kkdb= host=192.168.120.149 port=5432 user=kkuser password=redhat
postgres= host=192.168.120.149 port=5432 user=postgres password=redhat
[pgbouncer]
logfile = /var/log/pgbouncer/pgbouncer.log
pidfile = /var/run/pgbouncer/pgbouncer.pid
listen_addr = *
listen_port = 6432
auth_type = md5
auth_file = /etc/pgbouncer/userlist.txt
admin_users = postgres,kkuser
pool_mode = session
server_reset_query = DISCARD ALL
ignore_startup_parameters = extra_float_digits
max_client_conn = 1000
default_pool_size = 200

上面的认证模式md5，所以指定认证文件的路径，并加入以下内容：

[root@hdp06 pgbouncer]# vi userlist.txt 
"postgres" "md5fe4b5cfa57349c59d9b18d6920de5f59"
"kkuser" "md5ad9501a851743f17648b943395f791e0"

其中的md5值，可以在数据库中通过md5将密码进行编码，如下：

postgres=# SELECT ‘md5‘||md5(‘redhat‘||‘postgres‘);

如果安装的是rpm二进制软件包，则使用下面的方法：

[root@hdp06 ~]# cd /etc/pgbouncer
[root@hdp06 pgbouncer]# ./mkauth.py userlist.txt "host=192.168.120.149 port=5432 dbname=kkdb user=kkuser password=redhat"
[root@hdp06 pgbouncer]# chown pgbouncer:pgbouncer userlist.txt
--或者直接查询数据库
postgres=# select usename, passwd from pg_shadow order by 1;

3、启动pgbouncer

如果通过源代码安装，只能使用非root用户启动。

[root@hdp06 pgbouncer]# systemctl enable pgbouncer
[root@hdp06 pgbouncer]# systemctl start pgbouncer
[root@hdp06 pgbouncer]# systemctl status pgbouncer
● pgbouncer.service - A lightweight connection pooler for PostgreSQL
   Loaded: loaded (/usr/lib/systemd/system/pgbouncer.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2018-12-13 17:13:07 CST; 5s ago
  Process: 21134 ExecStart=/usr/bin/pgbouncer -d -q ${BOUNCERCONF} (code=exited, status=0/SUCCESS)
 Main PID: 21136 (pgbouncer)
   CGroup: /system.slice/pgbouncer.service
           └─21136 /usr/bin/pgbouncer -d -q /etc/pgbouncer/pgbouncer.ini

Dec 13 17:13:07 hdp06 systemd[1]: Starting A lightweight connection pooler for PostgreSQL...
Dec 13 17:13:07 hdp06 systemd[1]: PID file /var/run/pgbouncer/pgbouncer.pid not readable (yet?) after start.
Dec 13 17:13:07 hdp06 systemd[1]: Started A lightweight connection pooler for PostgreSQL.
[root@hdp06 pgbouncer]# netstat -antpl|grep 6432
tcp        0      0 0.0.0.0:6432            0.0.0.0:*               LISTEN      21136/pgbouncer     
tcp6       0      0 :::6432                 :::*                    LISTEN      21136/pgbouncer     

4、测试pgbouncer

[postgres@pg07 ~]$ psql -Upostgres -dpostgres -p6432 -h192.168.120.104
Password for user postgres: 
psql (10.6)
Type "help" for help.
postgres=# \l

5、管理PgBouncer

PgBouncer有一个管理控制台，可以登录到pgbouncer虚拟数据库来访问它。该控制台接受类SQL命令，这些命令允许用户监控、重新配置和管理PgBouncer。

[postgres@pg07 ~]$ psql -Upostgres -dpgbouncer -p6432 -h192.168.120.104
Password for user postgres: 
psql (10.6, server 1.9.0/bouncer)
Type "help" for help.

pgbouncer=# show clients;
pgbouncer=# show servers;

如果变更了pgbouncer配置文件，不用重启，直接reload下就ok。

pgbouncer=# reload;

更多pgbouncer管理，请参考官方文档。

安装配置PgBouncer for PostgreSQL

标签：访问   mode   而不是   一个用户   new   启动   share   组合   bounce   

原文地址：http://blog.51cto.com/candon123/2330143