[postgres@rhel73 data]$ [postgres@rhel73 data]$ psql -l -p 5432 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 test | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | (4 rows) [postgres@rhel73 data]$ psql -l -p 5433 psql: Could not connect to server: No such file or directory ------>>>从此处可以看出,PG是用端口号来区分不同的cluster. Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGsql.5433"? [postgres@rhel73 data]$ exit [root@rhel73 ~]# netstat -lpntu| grep --color -i -E 'listen|listening' | grep 5432 tcp 0 0 127.0.0.1:5432 0.0.0.0:* LISTEN 2632/postgres---->>2632是ospid,见下面的命令 tcp6 0 0 ::1:5432 :::* LISTEN 2632/postgres [root@rhel73 ~]# ps -ef | grep 2632 postgres 2632 1 0 03:51 pts/0 00:00:00 /usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data postgres 2634 2632 0 03:51 ? 00:00:00 postgres: checkpointer process postgres 2635 2632 0 03:51 ? 00:00:00 postgres: writer process postgres 2636 2632 0 03:51 ? 00:00:00 postgres: wal writer process postgres 2637 2632 0 03:51 ? 00:00:00 postgres: autovacuum launcher process postgres 2638 2632 0 03:51 ? 00:00:00 postgres: stats collector process root 8190 2501 0 13:41 pts/0 00:00:00 grep --color=auto 2632 [root@rhel73 ~]#额外说一句:SAP Sybase ASE也是用端口号来区分不同的数据库服务.
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