repmgr學習記錄（搭建主從複製）

1.在master和standby上安裝PG、repmgr，建立postgres角色(rsync is available and passwordless SSH connections are possible between both servers)

【　　[postgres@node1 ~]$ ssh-keygen -t rsa

　　　[postgres@node1 ~]$ ssh-copy-id -i .ssh/id_rsa.pub postgres@node2

　　　[postgres@node1 ~]$ ssh node2 date

　　　　 Tue Apr 15 01:17:20 CST 2014

　　   [postgres@node2 ~]$ ssh-keygen -t rsa

　　   [postgres@node2 ~]$ ssh-copy-id -i .ssh/id_rsa.pub postgres@node1

　　  [postgres@node2 ~]$ ssh node1 date

　　　　Tue Apr 15 01:18:13 CST 2014

】；

2.master初始化數據庫，建立配置文件postgresql.replication.conf：

max_wal_senders = 10

wal_level = 'hot_standby'

hot_standby = on

archive_mode = on

archive_command = '/bin/true'

# wal_keep_segments = 5000
，並修改postgresql.conf： include ‘postgresql.replication.conf’

3.master建立用戶、數據庫：createuser -s repmgr | createdb repmgr -O repmgr

4.master配置pg_hba.conf：

host    replication     repmgr  127.0.0.1/32    trust
host    replication     repmgr  192.168.98.0/24 trust

host    repmgr          repmgr  192.168.98.0/24 trust

5.master建立repmgr.conf配置文件：

cluster=test　　【全部節點保持一致】
node=1
node_name=node1
conninfo='host=repmgr_node1 user=repmgr dbname=repmgr'
6.master修改repmgr的搜索路徑：ALTER USER repmgr SET search_path TO repmgr_test, "$user", public;
7.master節點初始化master：repmgr -f repmgr.conf master register
8.standby節點建立repmgr.conf：
ALTER USER repmgr SET search_path TO repmgr_test, "$user", public;repmgr -f repmgr.conf master register

9.克隆standby:repmgr -h 192.168.98.55 -U repmgr -d repmgr -D /home/postgres/PG-9.6.1/ -f /home/postgres/repmgr.conf standby clone10.調整配置文件，啓動standby數據庫：pg_ctl -D /home/postgres/PG-9.6.1/ start11.註冊standy數據庫:repmgr -f repmgr.conf standby registercluster=test
node=2
node_name=node2
conninfo='host=repmgr_node2 user=repmgr dbname=repmgr'