實驗環境git
名稱github |
IPsql |
系統數據庫 |
Mastercentos |
172.17.10.190bash |
Centos 6.5ide |
Slavepost |
172.17.10.189ui |
Centos 6.5url |
1.yun安裝
rpm -ivh https://download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-6-x86_64/pgdg-centos96-9.6-3.noarch.rpm yum install postgresql96.x86_64 postgresql96-server.x86_64 -y
2.主從配置
2.1 主數據庫配置
啓動master
/etc/init.d/postgresql-9.6 initdb /etc/init.d/postgresql-9.6 start su - postgres psql
受權
create role repl login replication encrypted password '51idc.com';
編輯hba文件
/var/lib/pgsql/9.6/data/pg_hba.conf
新增
host replication repl 172.17.10.0/24 md5 host all repl 172.17.10.0/24 trust
編輯配置文件
/var/lib/pgsql/9.6/data/postgresql.conf
listen_addresses = 172.17.10.190 wal_level = hot_standby #熱備模式 max_wal_senders= 6 #能夠設置最多幾個流複製連接,差很少有幾個從,就設置多少 wal_keep_segments = 10240 #重要配置 wal_send_timeout = 60s max_connections = 512 #從庫的 max_connections要大於主庫 archive_mode = on #容許歸檔 archive_command = 'cp %p /url/path%f' #根據實際狀況設置
2.2 從數據庫配置
su - postgres
若是開始爲啓動數據庫可忽略下一步
rm -rf /var/lib/pgsql/9.6/data/* #開始沒有啓動從數據庫,這一步能夠省略 pg_basebackup -h 172.17.10.190 -U repl -D /var/lib/pgsql/9.6/data -X stream -P cp /usr/pgsql-9.6/share/recovery.conf.sample /var/lib/pgsql/9.6/data/recovery.conf
修改配置文件recovery.conf
standby_mode = on primary_conninfo = 'host=172.17.10.190 port=5432 user=repl password=51idc.com' trigger_file = '/var/lib/pgsql/9.6/data/trigger.kenyon' #主從切換時後的觸發文件 recovery_target_timeline = 'latest'
配置postgresql.conf文件
listen_addresses = 172.17.10.189 wal_level = hot_standby max_connections = 1000 #通常從的最大連接要大於主的。 hot_standby = on #說明這臺機器不單單用於數據歸檔,也用於查詢 max_standby_streaming_delay = 30s wal_receiver_status_interval = 10s #多久向主報告一次從的狀態。 hot_standby_feedback = on #若是有錯誤的數據複製,是否向主進行範例
檢測
select client_addr,sync_state from pg_stat_replication;
查看主從狀態
select * from pg_stat_replication;
腳本監控主從
#!/bin/bash # mail xuel@51idc.com data=`date +%Y-%M-%d" "%H:%m` netstat -lntup|grep 5432 && ps -ef|grep postmaster if [ $? -eq 0 ];then for IP in 172.17.10.188 172.17.10.189 do /usr/bin/psql -h 172.17.10.190 -p 5432 -U repl -d postgres --command "select * from pg_stat_replication"|grep $IP if [ "$?" != "0" ];then echo "postgresql master-slave status is error! please login check!"|mail -r "xuel@51idc.com" -s "postgresql master-slave status is error" xuel@51idc.com \ && echo "$data postgresql postgresql master-slave status is error!">>/var/log/postgresql-error.log fi done else echo "postgresql master-slave status is error! please login check!"|mail -r "xuel@51idc.com" -s "postgresql master-slave status is error" xuel@51idc.com \ && echo "$data postgresql postgresql master-slave status is error!">>/var/log/postgresql-error.log fi
2.3主從切換
主庫查看進程爲sender
備庫
中止主庫
查看slave的日誌
建立觸發文件,切換主
touch trigger.kenyon
查看slave的日誌,面前已經切換爲主
使用pg_controldata
備機狀態爲: in archive recovery
主庫狀態爲:in production