Postgres文件所有者更改造成異常處理 本地一臺測試機，被同事一不小將根目錄下所有文件的屬主都改成了root( chown -R root:root /，這是個坑爹而且危險的操作)，postgres數據庫是用其他用戶安裝的，上面還有其他應用，這里簡單說下postgres數據庫的恢復過程

Postgres文件所有者更改造成異常處理

本地一臺測試機，被同事一不小將根目錄下所有文件的屬主都改成了root( chown -R root:root /，這是個坑爹而且危險的操作)，postgres數據庫是用其他用戶安裝的，上面還有其他應用，這里簡單說下postgres數據庫的恢復過程。

1.環境

OS:CentOS 6.2

DB:postgres 9.2.4

2.異常現象

a.數據庫進程沒了

b.日志情況

[postgresql@localhost pg_log]$ tail -f postgresql-2013-05-06_000000.csv

2013-05-06 17:11:21.923 CST,"test","testdb",664,"172.25.10.1:13906",51876c10.298,3,"idle",2013-05-06 16:38:40 CST,37/0,0,WARNING,57P02,"terminating connection because of crash of another server process","The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.","In a moment you should be able to reconnect to the database and repeat your command.",,,,,,,""

2013-05-06 17:11:21.921 CST,"test","testdb",2633,"172.25.10.88:45681",5187730e.a49,3,"idle",2013-05-06 17:08:30 CST,14/0,0,WARNING,57P02,"terminating connection because of crash of another server process","The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.","In a moment you should be able to reconnect to the database and repeat your command.",,,,,,,""

.....

2013-05-06 17:11:21.926 CST,,,24842,,5162b7b7.610a,8,,2013-04-08 20:27:35 CST,,0,LOG,00000,"all server processes terminated; reinitializing",,,,,,,,,""

2013-05-06 17:11:21.955 CST,,,24842,,5162b7b7.610a,9,,2013-04-08 20:27:35 CST,,0,LOG,42501,"could not open file ""postmaster.pid"": Permission denied",,,,,,,,,""

2013-05-06 17:11:22.011 CST,,,24842,,5162b7b7.610a,10,,2013-04-08 20:27:35 CST,,0,PANIC,42501,"could not open control file ""global/pg_control"": Permission denied",,,,,,,,,""

3.恢復過程

a.首先改回用戶權限

[root@localhost ~]#chown -R postgresql:postgresql /var/postgres

[root@localhost ~]#chown -R postgresql:postgresql /data/pgdata

b.重新啟動

[postgresql@localhost pg_log]$ pg_start

server starting

[postgresql@localhost pg_log]$ FATAL: could not open lock file "/tmp/.s.PGSQL.lock": Permission denied

could not open control file ""global/pg_control"": Permission denied

重新啟動的時候發現數據庫仍然不能起來，但是這里給出了一個信息，tmp下socket文件權限不夠

返回到root用戶下授權，再啟動

[root@localhost home]#cd /tmp

[root@localhost tmp]#ls -a .s.PGSQL*

.s.PGSQL.5432 .s.PGSQL.5432.lock

[root@localhost tmp]#chown postgresql:postgresql ./.s.PGSQL*

[root@localhost tmp]#su - postgresql

[postgresql@localhost ~]$ pg_start

--還是報上面的錯誤，因為socket文件是本地通信文件，故先刪除再啟動DB，平時沒事不要手賤去刪

[root@localhost tmp]#rm -f ./.s.PGSQL*

[postgresql@localhost ~]$ pg_start

server starting

[postgresql@localhost ~]$ LOG: could not bind Unix socket: Address already in use

HINT: Is another postmaster already running on port 5432? If not, remove socket file "/tmp/.s.PGSQL.5432" and retry.

WARNING: could not create Unix-domain socket

c.登陸檢查

[postgresql@localhost ~]$ psql

psql: could not connect to server: No such file or directory

Is the server running locally and accepting

connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

[postgresql@localhost ~]$ psql -h 192.168.10.38

Password:

psql (9.2.4)

Type "help" for help.

postgres=# \q

檢查了一下，剛才啟動的時候在tmp下面socket文件沒有生成，導致psql登陸直接報錯。若想psql能直接登陸，再重啟一下DB，socket文件會隨著服務器的啟動而生成。

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