postgresql12 流复制搭建
作者:互联网
基于上次的postgresql单机安装,部署postgresql异步流复制
环境准备:
IP | 配置 | 角色 |
192.168.56.117 | 1C/2G/20GB centos7 | 主 |
192.168.56.118 | 1C/2G/20GB centos7 | 从 |
主库执行:
创建用户:
groupadd postgresuseradd -g postgres postgres
创建目录:
mkdir -p /postgresql/datachown -R postgres.postgres /postgresql/datamkdir -p /postgresql/archivechown -R postgres.postgres /postgresql/archive
初始化主库:
initdb -D /postgresql/data
修改主库配置:
vim /postgresql/data/postgresql.conf
listen_addresses = '*'port = 5432max_wal_senders = 10wal_level = replicaarchive_mode = onarchive_command = 'cp %p /postgresql/archive/%f'hot_standby = on
vim /data/pg/pg_hba.conf
在最后添加一行
host replication repl 192.168.56.0/24 md5
重启主库:
su - postgrespg_ctl -D /postgresql/data/ restart
创建复制用户:
psqlCREATE USER repl replication LOGIN CONNECTION LIMIT 5 ENCRYPTED PASSWORD '123456';
备库执行:
创建用户:
groupadd postgresuseradd -g postgres postgres
创建数据目录:
mkdir -p /postgresql/datachown -R postgres.postgres /postgresql/datamkdir -p /postgresql/archivechown -R postgres.postgres /postgresql/archive
创建基于主库的基础备份:
su - postgrespg_basebackup -h 192.168.56.117 -U repl -W -p 5432 -Fp -Xs -v -P -D /postgresql/data -l backup_label -R
[postgres@localhost data]$ pg_basebackup -h 192.168.56.117 -U repl -W -p 5432 -Fp -Xs -v -P -D /postgresql/data -l backup_label -RPassword: pg_basebackup: initiating base backup, waiting for checkpoint to completepg_basebackup: checkpoint completedpg_basebackup: write-ahead log start point: 0/6000028 on timeline 1pg_basebackup: starting background WAL receiverpg_basebackup: created temporary replication slot "pg_basebackup_2964"32554/32554 kB (100%), 1/1 tablespace pg_basebackup: write-ahead log end point: 0/6000100pg_basebackup: waiting for background process to finish streaming ...pg_basebackup: syncing data to disk ...pg_basebackup: base backup completed
不同于postgresql11版本及之前,postgresql12在建立流复制方面有所改动:
recovery.conf is no longer used, and the server will not start if the file exists. recovery.signal and standby.signal are now used to switch into non-primary mode. trigger_file has been renamed to promote_trigger_file. The standby_mode setting has been removed.
大致包含如下改动:
recover.conf不再支持,其中的参数合并至postgresql.conf,如该文件存在,则数据库启动失败
不再支持standby_mode参数
增加recover.signal文件,表示数据库处于recover模式
增加standby.signal文件,表示数据库处于standby模式
trigger_file参数重命名为promote_trigger_file
在基础备份pb_basebackup中指定-R则会在数据目录生成standby.signal
在postgresql.auto.conf中,也生成了primary_conninfo参数配置
[postgres@localhost data]$ cat postgresql.auto.conf # Do not edit this file manually!# It will be overwritten by the ALTER SYSTEM command.primary_conninfo = 'user=repl password=123456 host=192.168.56.117 port=5432 sslmode=disable sslcompression=0 gssencmode=disable krbsrvname=postgres target_session_attrs=any'
启动备库:
pg_ctl -D /data/pg start
验证流复制状态:
主库执行:
select * from pg_stat_replication;\x
查看流复制状态:
postgres=# select * from pg_stat_replication;\x
-[ RECORD 1 ]----+------------------------------
pid | 3048
usesysid | 16384
usename | repl
application_name | walreceiver
client_addr | 192.168.56.118
client_hostname |
client_port | 60894
backend_start | 2020-09-04 10:37:11.915897+08
backend_xmin |
state | streaming
sent_lsn | 0/7000148
write_lsn | 0/7000148
flush_lsn | 0/7000148
replay_lsn | 0/7000148
write_lag | 00:00:00.030901
flush_lag | 00:00:00.032029
replay_lag | 00:00:00.032136
sync_priority | 0
sync_state | async
reply_time | 2020-09-04 10:37:11.939726+08
Expanded display is off.
标签:postgresql,postgres,192.168,postgresql12,复制,pg,搭建,data,basebackup 来源: https://blog.51cto.com/15080020/2655565