pgpool安装配置整理

安装PostgreSQL并配置三节点流复制环境,就不仔细说了,大致步骤如下:

1.下载源码

2.解压安装,如果在./configure --prefix=/usr/pgsql-10执行时提示要--without-readline,而系统已经有了readline一般是没有安装devel库

3.initdb 

4.修改data目录下的postgresql.conf文件,主要有三个地方:listen_address='*',  wal_level=replica(10好像是默认的,9要改为hot_standby),hot_standby=on

5.修改data目录下的pg_hba.conf,添加网段允许

6.备节点上data目录下执行pg_basebackup -Fp -R -h 主IP -D ./ ,然后修改recovery.conf文件,添加trigger_file='/tmp/.tfile'到最后一行,启动数据库就与主节点保持异步了。如果想保持同步,则在主节点的postgresql.conf中修改synchronse_names='frist 1(*)' , 备节点的recovery.conf的primary_info添加application_name='standby1'即可。

7.其他备节点同上操作。

 

安装pgpool

1. 下载源码安装:

wget http://www.pgpool.net/download.php?f=pgpool-II-3.7.4.tar.gz

 

2. 解压并安装

tar -xzvf download.php\?f\=pgpool-II-3.7.4.tar.gz

cd pgpool-II-3.7.4/

./configure --prefix=/usr/pgpool --with-pgsql=/usr/pgsql-10/

make && make install

 

3.配置节点互信

ssh-keygen

然后将所有的id_rsa.pub汇总到au里面,然后分发到每个节点

 

4.添加环境变量

echo "export PATH=$PATH:/usr/pgpool/bin">>~/.bash_profile

source ~/.bash_profile

 

5.修改pcp.conf

cd /usr/pgpool/etc

cp pcp.conf.sample pcp.conf

 

pg_md5 -u postgres postgres 生成的密码是错的,很奇怪。

pg_md5 -u postgres postgres 

e8a48653851e28c69d0506508fb27fc5

添加-m参数会在该目录下生成一个pool_passwd文件,里面的md5密码又是对的

 

通过SQL语句查出来的密码是:

postgres=# select passwd from pg_shadow where usename='postgres';

md53175bce1d3201d16594cebf9d7eb3f9d

 

echo "postgres:md53175bce1d3201d16594cebf9d7eb3f9d">>pcp.conf

 

6.生成pool_passwd

pg_md5 -m -u postgres postgres (使用该命令会自动生成文件)

 

7.修改pgpool.conf

cp pgpool.conf.sample pgpool.conf

listen_addresses = '*'

......

backend_hostname0 = '10.9.8.185'
# Host name or IP address to connect to for backend 0
backend_port0 = 5432
# Port number for backend 0
backend_weight0 = 1
# Weight for backend 0 (only in load balancing mode)
backend_data_directory0 = '/var/lib/pgsql/10/data'
# Data directory for backend 0
backend_flag0 = 'ALLOW_TO_FAILOVER'
# Controls various backend behavior
# ALLOW_TO_FAILOVER, DISALLOW_TO_FAILOVER
# or ALWAYS_MASTER
backend_hostname1 = '10.9.8.189'
backend_port1 = 5432
backend_weight1 = 1
backend_data_directory1 = '/var/lib/pgsql/10/data'
backend_flag1 = 'ALLOW_TO_FAILOVER'

backend_hostname2 = '10.9.8.191'
backend_port2 = 5432
backend_weight2 = 1
backend_data_directory2 = '/var/lib/pgsql/10/data'
backend_flag2 = 'ALLOW_TO_FAILOVER'

......

follow_master_command = '/usr/pgpool/etc/failover.sh %H %R'

 

 

8.修改failover.sh脚本

new_master=$1
pgdata=$2

# Do nothing if standby goes down.
if [ $failed_node = 1 ]; then
    exit 0;
fi

# Create the trigger file.
#/usr/bin/ssh -T $new_master /bin/touch $trigger_file
/usr/bin/ssh -T $new_master /usr/pgsql-10/bin/pg_ctl promote -D $pgdata

exit 0;

 

9.修改pool_hba.conf文件

echo "host    all         all         10.9.8.1/24           md5" >> pool_hba.conf

 

10.启动pgpool 查看节点状态

pgpool -n>/var/log/pgpool.log 2>&1 &

psql -h 10.9.8.187 -U postgres -p 9999 -d postgres

postgres=# show pool_nodes;
 node_id |  hostname  | port | status | lb_weight |  role  | select_cnt | load_balance_node | replication_delay
---------+------------+------+--------+-----------+--------+------------+-------------------+-------------------
 0       | 10.9.8.185 | 5432 | up     | 0.333333  | master | 0          | true              | 0
 1       | 10.9.8.189 | 5432 | up     | 0.333333  | slave  | 0          | false             | 0
 2       | 10.9.8.191 | 5432 | up     | 0.333333  | slave  | 0          | false             | 0
(3 行记录)

postgres=#

 

后面需要验证的问题有:

1.主从切换后,另外一个slave会不会和新的主节点保持同步?

2.主从切换是找同步节点吗,还是在两个slave节点中node_id顺序靠前的这个?

3.如果两个slave都是异步节点,会找xlog(wal)lsn最大的节点做master吗?

4.主节点重新上线,会自动跟新主节点保持同步吗?

 

转载于:https://www.cnblogs.com/kuang17/p/9264449.html

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