这篇文章主要讲解了“PostgreSQL数据库启动时socket存储目录的配置是什么”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“PostgreSQL数据库启动时socket存储目录的配置是什么”吧！
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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 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
尝试连接数据库
[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 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指定为socket所在目录
[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 ~]$
感谢各位的阅读，以上就是“PostgreSQL数据库启动时socket存储目录的配置是什么”的内容了，经过本文的学习后，相信大家对PostgreSQL数据库启动时socket存储目录的配置是什么这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！
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