一、环境
$ cat /etc/redhat-release
CentOS Linux release 7.0.1406 (Core)
node1: 192.168.111.128
node2: 192.168.111.129
vip-master: 192.168.111.228
vip-slave: 192.168.111.229
配置主机名
hostnamectl set-hostname postgres128
hostnamectl set-hostname postgres129
[root@postgres128 ~]# vi /etc/hosts
192.168.111.128 postgres128
192.168.111.129 postgres129
二、配置Linux集群环境
1. 安装Pacemaker和Corosync
在所有节点执行：
[root@postgres128 ~]# yum install -y pacemaker pcs psmisc policycoreutils-python
2. 禁用防火墙
在所有节点执行：
[root@postgres128 ~]# systemctl disable firewalld.service
[root@postgres128 ~]# systemctl stop firewalld.service
3. 启用pcs
在所有节点执行：
[root@postgres128 ~]# systemctl start pcsd.service
[root@postgres128 ~]# systemctl enable pcsd.service
[root@postgres128 ~]# echo hacluster | sudo passwd hacluster --stdin
4. 集群认证
在任何一个节点上执行，这里选择node1：
[root@postgres128 ~]# pcs cluster auth -u hacluster -p hacluster 192.168.111.128 192.168.111.129
5. 同步配置
在node1上执行：
[root@postgres128 ~]# pcs cluster setup --last_man_standing=1 --name pgcluster 192.168.111.128 192.168.111.129
Shutting down pacemaker/corosync services...
Redirecting to /bin/systemctl stop pacemaker.service
Redirecting to /bin/systemctl stop corosync.service
Killing any remaining services...
Removing all cluster configuration files...
192.168.111.128: Succeeded
192.168.111.129: Succeeded
6. 启动集群
在node1上执行：
[root@postgres128 ~]# pcs cluster start --all
192.168.111.128: Starting Cluster...
192.168.111.129: Starting Cluster...
7. 检验
1）检验corosync
在node1上执行：
$ sudo pcs status corosync
Membership information
----------------------
Nodeid Votes Name
1 1 192.168.111.128 (local)
2 1 192.168.111.129
2）检验pacemaker
[root@postgres128 ~]# pcs status
Cluster name: pgcluster
WARNING: no stonith devices and stonith-enabled is not false
Last updated: Wed Sep 6 02:20:28 2017
Last change:
Current DC: NONE
0 Nodes configured
0 Resources configured
Full list of resources:
PCSD Status:
192.168.111.128: Online
192.168.111.129: Online
Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/enabled
三、安装和配置PostgreSQL
配置参考
查看PG流复制结果。
[postgres@localhost ~]$ psql
psql (9.6.0)
Type "help" for help.
postgres=# \x
Expanded display is on.
postgres=# select * from pg_stat_replication ;
-[ RECORD 1 ]----+------------------------------
pid | 2111
usesysid | 16384
usename | replica
application_name | standby01
client_addr | 192.168.111.129
client_hostname |
client_port | 45608
backend_start | 2017-09-06 05:13:29.766227-04
backend_xmin | 1756
state | streaming
sent_location | 0/50000D0
write_location | 0/50000D0
flush_location | 0/50000D0
replay_location | 0/5000098
sync_priority | 1
sync_state | sync
停止PostgreSQL服务
$ pg_stop
waiting for server to shut down...... done
server stopped
四、配置自动切换
1. 配置
在node1执行：
将配置步骤先写到脚本
# 将cib配置保存到文件
[root@postgres128 postgres]# vi cluster_setup.sh
pcs cluster cib pgsql_cfg
# 在pacemaker级别忽略quorum
pcs -f pgsql_cfg property set no-quorum-policy="ignore"
# 禁用STONITH
pcs -f pgsql_cfg property set stonith-enabled="false"
# 设置资源粘性，防止节点在故障恢复后发生迁移
pcs -f pgsql_cfg resource defaults resource-stickiness="INFINITY"
# 设置多少次失败后迁移
pcs -f pgsql_cfg resource defaults migration-threshold="3"
# 设置master节点虚ip
pcs -f pgsql_cfg resource create vip-master IPaddr2 ip="192.168.111.228" cidr_netmask="24" op start timeout="60s" interval="0s" on-fail="restart" op monitor timeout="60s" interval="10s" on-fail="restart" op stop timeout="60s" interval="0s" on-fail="block"
# 设置slave节点虚ip
pcs -f pgsql_cfg resource create vip-slave IPaddr2 ip="192.168.111.229" cidr_netmask="24" op start timeout="60s" interval="0s" on-fail="restart" op monitor timeout="60s" interval="10s" on-fail="restart" op stop timeout="60s" interval="0s" on-fail="block"
# 设置pgsql集群资源
# pgctl、psql、pgdata和config等配置根据自己的环境修改,node list填写节点的hostname，master_ip填写虚master_ip
pcs -f pgsql_cfg resource create pgsql pgsql pgctl="/opt/pgsql96/bin/pg_ctl" psql="/opt/pgsql96/bin/psql" pgdata="/home/postgres/data" config="/home/postgres/data/postgresql.conf" rep_mode="sync" node_list="postgres128 postgres129" master_ip="192.168.111.228" repuser="replica" primary_conninfo_opt="password=replica keepalives_idle=60 keepalives_interval=5 keepalives_count=5" restore_command="cp /home/postgres/arch/%f %p" restart_on_promote=‘true‘ op start timeout="60s" interval="0s" on-fail="restart" op monitor timeout="60s" interval="4s" on-fail="restart" op monitor timeout="60s" interval="3s" on-fail="restart" role="Master" op promote timeout="60s" interval="0s" on-fail="restart" op demote timeout="60s" interval="0s" on-fail="stop" op stop timeout="60s" interval="0s" on-fail="block"
# 设置master/slave模式，clone-max=2，两个节点
pcs -f pgsql_cfg resource master pgsql-cluster pgsql master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=true
# 配置master ip组
pcs -f pgsql_cfg resource group add master-group vip-master
# 配置slave ip组
pcs -f pgsql_cfg resource group add slave-group vip-slave
# 配置master ip组绑定master节点
pcs -f pgsql_cfg constraint colocation add master-group with master pgsql-cluster INFINITY
# 配置启动master节点
pcs -f pgsql_cfg constraint order promote pgsql-cluster then start master-group symmetrical=false score=INFINITY
# 配置停止master节点
pcs -f pgsql_cfg constraint order demote pgsql-cluster then stop master-group symmetrical=false score=0
# 配置slave ip组绑定slave节点
pcs -f pgsql_cfg constraint colocation add slave-group with slave pgsql-cluster INFINITY
# 配置启动slave节点
pcs -f pgsql_cfg constraint order promote pgsql-cluster then start slave-group symmetrical=false score=INFINITY
# 配置停止slave节点
pcs -f pgsql_cfg constraint order demote pgsql-cluster then stop slave-group symmetrical=false score=0
# 把配置文件push到cib
pcs cluster cib-push pgsql_cfg
2. 执行加载命令
[root@postgres128 postgres]# chmod +x cluster_setup.sh
[root@postgres128 postgres]# ./cluster_setup.sh
Adding pgsql-cluster master-group (score: INFINITY) (Options: symmetrical=false score=INFINITY first-action=promote then-action=start)
Adding pgsql-cluster master-group (score: 0) (Options: symmetrical=false score=0 first-action=demote then-action=stop)
Adding pgsql-cluster slave-group (score: INFINITY) (Options: symmetrical=false score=INFINITY first-action=promote then-action=start)
Adding pgsql-cluster slave-group (score: 0) (Options: symmetrical=false score=0 first-action=demote then-action=stop)
CIB updated
3. 启动数据库
3查看pcs status
[root@postgres129 ~]# pcs status
Cluster name: pgcluster
Last updated: Wed Sep 6 22:13:39 2017
Last change: Wed Sep 6 06:00:26 2017 via cibadmin on postgres128
Stack: corosync
Current DC: postgres128 (1) - partition with quorum
Version: 1.1.10-29.el7-368c726
2 Nodes configured
4 Resources configured
Online: [ postgres128 postgres129 ]
Full list of resources:
Master/Slave Set: pgsql-cluster [pgsql]
Stopped: [ postgres128 postgres129 ]
Resource Group: master-group
vip-master (ocf::heartbeat:IPaddr2): Started postgres128
Resource Group: slave-group
vip-slave (ocf::heartbeat:IPaddr2): Started postgres129
PCSD Status:
192.168.111.128: Unable to authenticate
192.168.111.129: Unable to authenticate
Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/enabled
参考文献：
搭建+维护
https://my.oschina.net/aven92/blog/518928
https://my.oschina.net/aven92/blog/519458
时间： 2024-12-25 06:12:06