postgresql pgpool搭建及高可用简单配置

pgpool安装配置

安装环境：

系统debian-6.0.4

数据库：postgresql-9.3

pgpool：pgpool-II-3.3.1

pgpool机器

pgpool ip:172.16.2.150

pgpool ip:172.16.2.151

两台流复制机器

Mast:172.16.2.151

slave:172.16.2.152

中文手册：http://www.pgpool.net/docs/latest/pgpool-zh_cn.html

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安装postgresql-9.3

vi /etc/apt/sources.list.d/pgdg.list

deb http://apt.postgresql.org/pub/repos/apt/ squeeze-pgdg main

vi /etc/apt/sources.list

deb-src http://ftp.debian.org/debian/ squeeze-updates main

deb http://ftp.tw.debian.org/debian wheezy main

wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -

apt-get update

过程中会报错

W: There is no public key available for the following key IDs:

8B48AD6246925553

解决： gpg --keyserver subkeys.pgp.net --recv 8B48AD6246925553

gpg --export --armor 8B48AD6246925553 | apt-key add -

apt-get update

aptitude install postgresql-9.3

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安装pgpool-II-3.3.1

安装编译环境

aptitude install build-essential

tar -zxvf pgpool-II-3.3.1.tar.gz

cd pgpool-II-3.3.1

./configure

make

make install

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编译过程中会报没有postgresql-server-dev-X.Y错误

aptitude install flex

aptitude install postgresql-server-dev-9.3

aptitude install postgresql-contrib-9.3

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master配置

vi /etc/postgresql/9.3/main/postgresql.conf

listen_addresses = '*'

vi /etc/postgresql/9.3/main/pg_hba.conf 加入以下

host all all 127.0.0.1/32 trust

host all all 172.16.2.0/32 trust

host all all 172.16.2.152/32 trust

host all all 172.16.2.151/32 trust

host all all 172.16.2.150/32 trust

cp /usr/local/etc/pgpool.conf.sample /usr/local/etc/pgpool.conf

cd /usr/local/etc

vi pgpool.conf

修改如下

listen_addresses = '*'

parallel_mode = off

load_balance_mode = on

socket_dir = '/var/run/postgresql'

pcp_socket_dir = '/var/run/postgresql'

pid_file_name = '/var/run/postgresql/pgpool.pid'

backend_hostname0 = '172.16.2.151'

backend_port0 = 5432

backend_weight0 = 9

backend_data_directory0 = '/var/lib/postgresql/9.3/main/'

backend_hostname1 = '172.16.2.152'

backend_port1 = 5432

backend_weight1 = 9

backend_data_directory1 = '/var/lib/postgresql/9.3/main/'

backend_flag1 = 'ALLOW_TO_FAILOVER'

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cp pool_hba.conf.sample pool_hba.conf

vi pool_hba.conf

# IPv4 local connections:

host all all 127.0.0.1/32 trust

host all all 172.16.2.0/32 trust

host all all 172.16.2.152/32 trust

host all all 172.16.2.151/32 trust

host all all 172.16.2.150/32 trust

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su postgres

createuser -p 5432 pgpool

createdb -p 5432 -O pgpool pgpool

cp pcp.conf.sample pcp.conf

/usr/local/bin/pg_md5 postgres

vi pcp.conf

加入如下：

postgres:e8a48653851e28c69d0506508fb27fc5

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pgpool看门狗配置

172.16.2.150上的配置采用心跳模式（查询模式则注释掉）

vi pgpool.conf

需要修改的地方如下

use_watchdog = on

trusted_servers = '172.16.2.151,172.16.2.152'

wd_hostname = '172.16.2.150'

# - Virtual IP control Setting -

delegate_IP = '172.16.2.153'（虚拟ip，也就是两台pgpool对外的ip地址）

# -- heartbeat mode --

heartbeat_destination0 = '172.16.2.150'

heartbeat_destination1 = '172.16.2.151'

# -- query mode --

此模式下注释掉

# - Other pgpool Connection Settings -

other_pgpool_hostname1 = '172.16.2.151'（指定需要监控的 pgpool-II 服务器主机）

other_wd_port1 = 9000

172.16.2.151上配置同样采用心跳模式

需要修改的地方如下

vi pgpool.conf

use_watchdog = on

trusted_servers = '172.16.2.151,172.16.2.152'

wd_hostname = '172.16.2.151'

# - Virtual IP control Setting -

delegate_IP = '172.16.2.153'（虚拟ip，也就是两台pgpool对外的ip地址）

# -- heartbeat mode --

heartbeat_destination0 = '172.16.2.150'

heartbeat_destination1 = '172.16.2.151'

# -- query mode --

此模式下注释掉

# - Other pgpool Connection Settings -

other_pgpool_hostname0 = '172.16.2.150'（指定需要监控的 pgpool-II 服务器主机）

other_wd_port0 = 9000

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启动pgpool

在此过程中先启动的则会成为主，另一台作为备机启动没有先后顺序

/usr/local/bin/pgpool -dn -f /usr/local/etc/pgpool.conf -a /usr/local/etc/pool_hba.conf -F /usr/local/etc/pcp.conf