PG_RMAN备份遇到 domain socket

在用pg_rman做数据全备时；出现异常错误！

[postgres@sdserver40_210 run]$ pg_rman backup --backup-mode=full --progress
   ERROR: could not connect to database postgres: could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

根据提示错误去找ll -alrt /var/run | grep "5432" 是不存在socket "/var/run/postgresql/.s.PGSQL.5432"?； 肯定是不存在的；存在的话就不会出现上面异常错误；

[postgres@sdserver40_210 pgdata]$ ll -alrt /"
[postgres@sdserver40_210 pgdata]$ 

既然不存在；然道是数据库没启动；端口并不是5432；重启下数据库 ；查下端口也是5432；但是/tmp/.s.PGSQL.5432；并不是/var/run/postgresql/.s.PGSQL.5432。

[postgres@sdserver40_210 pgdata]$ netstat -nlp | grep
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp                               /postgres
unix        [ ACC ]     STREAM     LISTENING      /postgres      /tmp/.s.PGSQL.

【解决方案】

[root@sdserver40_210 run]# ln -s /tmp/.s.PGSQL. /
[root@sdserver40_210 run]#
[postgres@sdserver40_210 ~]$ pg_rman backup --backup-mode=full --progress
INFO: copying database files
Processed  of  files, skipped
NOTICE:  pg_stop_backup complete, all required WAL segments have been archived
INFO: copying archived WAL files
Processed  of  files, skipped
INFO: backup complete
HINT: Please execute 'pg_rman validate' to verify the files are correctly copied.