PostgreSQL数据库启动时socket存储目录的配置是什么

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unix_socket_directories参数默认为/tmp，由于该目录是临时目录，以免误操作，一般设置在其他目录中。
下面把unix_socket_directories设置为/data/pg12，重新启动

[pg12@localhost pg120db]$ grep 'unix' postgresql.conf unix_socket_directories = '/data/pg12' # comma-separated list of directories#unix_socket_directories = '/tmp'   # comma-separated list of directories#unix_socket_group = ''       # (change requires restart)#unix_socket_permissions = 0777     # begin with 0 to use octal notation[pg12@localhost pg120db]$ [pg12@localhost pg120db]$ pg_ctl restartpg_ctl: PID file "/data/pgsql/pg120db/postmaster.pid" does not existIs server running?trying to start server anywaywaiting for server to start....2019-11-18 18:17:35.123 CST [15542] LOG:  starting PostgreSQL 12.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit2019-11-18 18:17:35.123 CST [15542] LOG:  listening on IPv4 address "0.0.0.0", port 54322019-11-18 18:17:35.123 CST [15542] LOG:  listening on IPv6 address "::", port 54322019-11-18 18:17:35.155 CST [15542] LOG:  listening on Unix socket "/data/pg12/.s.PGSQL.5432"2019-11-18 18:17:35.237 CST [15542] LOG:  redirecting log output to logging collector process2019-11-18 18:17:35.237 CST [15542] HINT:  Future log output will appear in directory "pg_log". doneserver started

尝试连接数据库

[pg12@localhost pg120db]$ psql -d testdbpsql: error: could not connect to server: 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"?

提示找不到socket（默认在/tmp下），可使用指定主机&端口连接

但这样的连接方式不是本地连接

[pg12@localhost ~]$ netstat -anpo|grep psql(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.)tcp6       0      0 ::1:52206               ::1:5432                ESTABLISHED 16200/psql           keepalive (7207.79/0/0)

设置参数PGHOST，使用本地连接(PGHOST behaves the same as the host connection parameter.)

[pg12@localhost pg120db]$ export PGHOST=/data/pg12[pg12@localhost pg120db]$ psql -d testdbExpanded display is used automatically.psql (12.0)Type "help" for help....[pg12@localhost ~]$ netstat -anpo|grep psql(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.)unix  3      [ ]         STREAM     CONNECTED     876042   15681/psql           [pg12@localhost ~]$

或者使用-h指定为socket所在目录

[pg12@localhost ~]$ psql -h /data/pg12Expanded display is used automatically.psql (12.0)Type "help" for help.[local:/data/pg12]:5432 pg12@testdb=# ...[pg12@localhost ~]$ netstat -anpo|grep psql(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.)unix  3      [ ]         STREAM     CONNECTED     880596   16309/psql           [pg12@localhost ~]$

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