如何知道我的Postgresql服务器是否正在运行？
我收到此消息：
[~/dev/working/sw] sudo bundle exec rake db:migrate
rake aborted!
could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port 5432?
更新：
> which postgres /usr/local/bin/postgres > pg_ctl -D /usr/local/bin/postgres -l /usr/local/bin/postgres/server.log start pg_ctl: could not open PID file "/usr/local/bin/postgres/postmaster.pid": Not a directory
更新2：
>pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start server starting sh: /usr/local/var/postgres/server.log: No such file or directory
