测试环境pg10.5 两节点集群
之前由于主库的报错，把主从切换了。以至于后来解决这个问题。
psql: FATAL: index "pg_opclass_oid_index" contains unexpected zero page at block 0
==备库 [root@pg01 keepalived]# su - postgres Last login: Fri May 7 17:09:46 CST 2021 on pts/0 -bash-4.2$ psql psql: FATAL: index "pg_opclass_oid_index" contains unexpected zero page at block 0 HINT: Please REINDEX it.
==主库 postgres=# select client_addr,sync_state from pg_stat_replication; client_addr | sync_state -------------+------------ 10.15.9.13 | async (1 row)
根据之前的经验 reindex index ；
在主库执行 reindex index pg_opclass_oid_index; 从库还是无法登陆。
由于这个是系统表的索引，索引无法通过 drop，create的方式重新创建索引，只有从新通过 pg_basebackup 同步
1 停止备库、备份配置文件、删除数据目录
-bash-4.2$ pg_ctl stop -D /home/pgdata/ -bash-4.2$ cp pg_hba.conf postgresql.conf recovery.conf /opt/pgcnf/ -bash-4.2$ cd /home/pgdata -bash-4.2$ rm -rf * rm: cannot remove ‘base/90112/95992_fsm’: Structure needs cleaning ##报错，这个文件夹删不掉 rm: cannot remove ‘base/98794’: Structure needs cleaning -bash-4.2$ ll total 0 drwx------ 4 postgres postgres 32 May 10 14:47 base [root@pg01 pgcnf]# df -i Filesystem Inodes IUsed IFree IUse% Mounted on /dev/mapper/centos-root 26214400 44141 26170259 1% / devtmpfs 998571 361 998210 1% /dev tmpfs 1001321 1 1001320 1% /dev/shm tmpfs 1001321 467 1000854 1% /run tmpfs 1001321 16 1001305 1% /sys/fs/cgroup /dev/sda1 524288 328 523960 1% /boot /dev/mapper/centos-home 73986048 2941 73983107 1% /home tmpfs 1001321 1 1001320 1% /run/user/0 [root@pg01 pgcnf]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 199G 0 part ├─centos-root 253:0 0 50G 0 lvm / ├─centos-swap 253:1 0 7.9G 0 lvm [SWAP] └─centos-home 253:2 0 141.1G 0 lvm /home sr0 11:0 1 1024M 0 rom [root@pg01 pgcnf]# mount -l /dev/sda1 on /boot type xfs (rw,relatime,attr2,inode64,noquota) /dev/mapper/centos-home on /home type xfs (rw,relatime,attr2,inode64,noquota) -bash-4.2$ cd base/ -bash-4.2$ ll ls: cannot access 98794: Structure needs cleaning total 32 drwx------ 2 postgres postgres 16384 Sep 28 2020 90112 d????????? ? ? ? ? ? 98794 [root@pg01 pgcnf]# df -Th Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/centos-root xfs 50G 3.0G 47G 6% / devtmpfs devtmpfs 3.9G 0 3.9G 0% /dev tmpfs tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs tmpfs 3.9G 401M 3.5G 11% /run tmpfs tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/sda1 xfs 1014M 143M 872M 15% /boot /dev/mapper/centos-home xfs 142G 5.9G 136G 5% /home tmpfs tmpfs 783M 0 783M 0% /run/user/0 [root@pg01 pgcnf]# umount /dev/mapper/centos-home umount: /home: target is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) [root@pg01 pgcnf]# lsof |grep /dev/mapper/centos-home -bash: lsof: command not found [root@pg01 yum.repos.d]# yum-config-manager --add-repo=http://10.15.10.199/repo [root@pg01 yum.repos.d]# yum install lsof -y [root@pg01 yum.repos.d]# lsof |grep /dev/mapper/centos-home [root@pg01 yum.repos.d]# lsof |grep /home bash 32197 postgres cwd DIR 253,2 32 134266468 /home/pgdata/base [root@pg01 yum.repos.d]# ps -ef|grep 32197 root 1705 32361 0 15:09 pts/0 00:00:00 grep --color=auto 32197 postgres 32197 32196 0 14:45 pts/1 00:00:00 -bash [root@pg01 yum.repos.d]# kill -9 32197 [root@pg01 yum.repos.d]# lsof |grep /home ##操作前备份 /home的所有重要文件 [root@pg01 yum.repos.d]# umount /home [root@pg01 yum.repos.d]# xfs_repair /dev/mapper/centos-home #如果是ext4：fsck.ext4 /dev/mapper/centos-home disconnected inode 275099398, moving to lost+found disconnected inode 275099400, moving to lost+found Phase 7 - verify and correct link counts... resetting inode 134266468 nlinks from 4 to 3 done [root@pg01 yum.repos.d]# reboot 重启后 ，由于有自动挂载，所以开机自动挂载成功 [root@pg01 ~]# cat /etc/fstab /dev/mapper/centos-home /home xfs defaults 0 0 /dev/mapper/centos-swap swap swap defaults 0 0 [root@pg01 ~]# cd /home/pgdata [root@pg01 pgdata]# ll total 0 drwx------ 3 postgres postgres 19 May 10 14:47 base [root@pg01 pgdata]# rm -rf base/ #删除该目录
2 同步主从、回复配置文件
-bash-4.2$ pg_basebackup -D /home/pgdata -F p -X stream -R -v -P -h 10.15.9.150 -p 5432 -U repuser Password: pg_basebackup: initiating base backup, waiting for checkpoint to complete pg_basebackup: checkpoint completed pg_basebackup: write-ahead log start point: 4/C000028 on timeline 2 pg_basebackup: starting background WAL receiver 4657982/4657982 kB (100%), 1/1 tablespace pg_basebackup: write-ahead log end point: 4/C000130 pg_basebackup: waiting for background process to finish streaming ... pg_basebackup: base backup completed -bash-4.2$ vim pg_hba.conf -bash-4.2$ vim recovery.conf recovery_target_timeline = 'latest' standby_mode = 'on' -bash-4.2$ chmod 700 /home/pgdata -bash-4.2$ pg_ctl -D /home/pgdata start waiting for server to start....2021-05-10 15:22:03.181 CST [1275] LOG: listening on IPv4 address "0.0.0.0", port 5432 2021-05-10 15:22:03.181 CST [1275] LOG: listening on IPv6 address "::", port 5432 2021-05-10 15:22:03.185 CST [1275] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" 2021-05-10 15:22:03.194 CST [1275] LOG: listening on Unix socket "/tmp/.s.PGSQL.5432" 2021-05-10 15:22:03.319 CST [1275] LOG: redirecting log output to logging collector process 2021-05-10 15:22:03.319 CST [1275] HINT: Future log output will appear in directory "log". done server started
3 主库查看同步状态正常
postgres=# select client_addr,sync_state from pg_stat_replication; client_addr | sync_state -------------+------------ 10.15.9.13 | async (1 row) 从库 正常登陆 -bash-4.2$ psql psql (10.11) Type "help" for help. postgres=# l List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges ------------+----------+----------+-------------+-------------+----------------------- postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres + | | | | | postgres=CTc/postgres template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres + | | | | | postgres=CTc/postgres test1 | yhq | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =Tc/yhq + | | | | | yhq=CTc/yhq test2 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =Tc/postgres + | | | | | postgres=CTc/postgres+ | | | | | yhq=CTc/postgres (5 rows) postgres=# c test1 You are now connected to database "test1" as user "postgres". ^ test1=# d List of relations Schema | Name | Type | Owner --------+----------+-------+---------- public | user_tbl | table | postgres (1 row) test1=# select * from user_tbl; name | signup_date ---------+------------- yhqtest | 2019-07-19 (1 row)