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這篇文章主要講解了“PostgreSQL 數據庫啟動時 socket 存儲目錄的配置是什么”，文中的講解內容簡單清晰，易于學習與理解，下面請大家跟著丸趣 TV 小編的思路慢慢深入，一起來研究和學習“PostgreSQL 數據庫啟動時 socket 存儲目錄的配置是什么”吧！
unix_socket_directories 參數默認為 /tmp，由于該目錄是臨時目錄，以免誤操作，一般設置在其他目錄中。
[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 restart
pg_ctl: PID file /data/pgsql/pg120db/postmaster.pid does not exist
Is server running?
trying to start server anyway
waiting 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-bit
2019-11-18 18:17:35.123 CST [15542] LOG: listening on IPv4 address 0.0.0.0 , port 5432
2019-11-18 18:17:35.123 CST [15542] LOG: listening on IPv6 address :: , port 5432
2019-11-18 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 process
2019-11-18 18:17:35.237 CST [15542] HINT: Future log output will appear in directory pg_log .
done
server started嘗試連接數據庫
[pg12@localhost pg120db]$ psql -d testdb
psql: 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（默認在 /tmp 下），可使用指定主機 端口連接
但這樣的連接方式不是本地連接
[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)設置參數 PGHOST，使用本地連接 (PGHOST behaves the same as the host connection parameter.)
[pg12@localhost pg120db]$ export PGHOST=/data/pg12
[pg12@localhost pg120db]$ psql -d testdb
Expanded 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 ~]$或者使用 - h 指定為 socket 所在目錄
[pg12@localhost ~]$ psql -h /data/pg12
Expanded 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 ~]$感謝各位的閱讀，以上就是“PostgreSQL 數據庫啟動時 socket 存儲目錄的配置是什么”的內容了，經過本文的學習后，相信大家對 PostgreSQL 數據庫啟動時 socket 存儲目錄的配置是什么這一問題有了更深刻的體會，具體使用情況還需要大家實踐驗證。這里是丸趣 TV，丸趣 TV 小編將為大家推送更多相關知識點的文章，歡迎關注！
正文完
發表至： 數據庫
2023-07-26
