如何判断我的 Postgresql 服务器是否正在运行？
我收到这条消息：
[~/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
检查正在运行的进程的最简单方法：
ps auxwww | grep postgres
并寻找一个看起来像这样的命令（你的版本可能不是 8.3）：
/Library/PostgreSQL/8.3/bin/postgres -D /Library/PostgreSQL/8.3/data
要启动服务器，请执行以下操作：
/Library/PostgreSQL/8.3/bin/pg_ctl start -D /Library/PostgreSQL/8.3/data -l postgres.log
