PostgreSQL 三节点集群故障模拟及恢复
(postgreSQL9.5.1)
正常状态：
10.2.208.10:node1:master
10.2.208.11:node2:standby1同步
10.2.208.12:node3:standby2异步
10.2.208.13:node4:备用机
故障模拟及恢复
1 主库故障
1 停止主库(master)[M]服务[10.2.208.10]
pg_ctl –D ../data stop –m fast
2 更改S1的postgresql.conf[10.2.208.11]
synchronous_standby_names = 'node3'
3 更改S2 recovery.conf[10.2.208.12]
primary_conninfo = 'host=node2IP[10.2.208.11] port=6432 user=replica password=replica application_name=node3'
4 提升S1为新的主库Master
pg_ctl –D ../data promote[10.2.208.11]
5 重新启动S2[10.2.208.12] 使S2成为新的同步节点
pg_ctl –D ../data restart
6使node4[10.2.208.13]成为异步节点
mkdir data
chmod 0700 data
pg_basebackup -h 10.2.208.11 -P -Fp -x -v -p 6432 -U replica -D /home/replica/data/
7 node4[10.2.208.13]recovery文件处理
mv recovery.done recovery.conf
primary_conninfo = 'host=10.2.208.11 port=6432 user=replica password=replica'
8 node4[10.2.208.13]postgresql.conf文件处理
#synchronous_standby_names = ' '
9 启动node4[10.2.208.13]
pg_ctl -D ../data/ start
2备库1故障
1停止standby1服务
pg_ctl -D ../data/ stop -m fast
2更改node1[10.2.208.10]postgresql.conf
synchronous_standby_names = 'node3'
3更改S2[10.2.208.12]recovery.conf文件
primary_conninfo = 'host=10.2.208.10 port=6432 user=replica password=replica application_name=node3'
4重启主库Master
pg_ctl –D ../data restart
5重启S2成为同步节点
6 node4[10.2.208.13]成为异步节点
pg_basebackup -h 10.2.208.10 -P -Fp -x -v -p 6432 -U replica -D /home/replica/data/
mv recovery.done recovery.conf
primary_conninfo = 'host=10.2.208.10 port=6432 user=replica password=replica '
postgresql.conf文件
#synchronous_standby_names = ' '
7启动node4
pg_ctl –D ../data start
3 备库2故障
1 停止备库2 node3[10.2.208.12]的服务
pg_ctl –D ../data stop –m fast
2 node4[10.2.208.13]成为异步节点
pg_basebackup -h 10.2.208.10 -P -Fp -x -v -p 6432 -U replica -D /home/replica/data/
mv recovery.done recovery.conf
primary_conninfo = 'host=10.2.208.10 port=6432 user=replica password=replica '
postgresql.conf文件
#synchronous_standby_names = ' '
3启动node4
pg_ctl –D ../data start