致命错误锁定文件"postmaster.pid"已经存在 [英] FATAL ERROR lock file "postmaster.pid" already exists

问题描述

我最近使用Homebrew在我的Mac(El Capitan 10.11.4，Postgres是9.5.1版)上安装了PostGIS，我正在遵循以下说明-

I have recently installed PostGIS on my Mac (El Capitan 10.11.4, Postgres is version 9.5.1) using Homebrew, and I am following these instructions - http://morphocode.com/how-to-install-postgis-on-mac-os-x/

当我尝试使用Postgres启动

When I try to start Postgres using

pg_ctl -D /usr/local/var/postgres start 

我收到以下错误:

$ FATAL:  lock file "postmaster.pid" already exists
HINT:  Is another postmaster (PID 280) running in data directory "/usr/local/var/postgres"?

所以我花了几个小时研究如何解决这个问题，但无济于事.

So I spent a few hours researching how to address this, but to no avail.

值得注意的是，我尝试按照超级用户的答案中的建议杀死PID-

Notably, I tried to kill the PID as recommended in an answer on Superuser - https://superuser.com/questions/553045/fatal-lock-file-postmaster-pid-already-exists- (in the case above, I ran kill 208), but as soon as I tried to start Postgres again, I got the same error, albeit with a different PID number. I saw a few people recommended deleting the postmaster.pid file, but I feel like maybe I should save that as a last resort...

我不确定如何解决此问题的部分原因在于，我甚至还不清楚邮局局长是什么-我才刚刚开始学习所有这一切.

Admittedly part of the reason I'm not sure how to fix this is that I'm not really clear on what the postmaster even is - I'm just starting to learn about all of this.

通过psql db_name命令跳入Postgres数据库就可以了，因为它值得.

Hopping into a Postgres database via the psql db_name command works just fine, for what it's worth.

推荐答案

Postmaster 是PostgreSQL的主要过程.您正在尝试启动已经运行的PostgreSQL(您说自己可以连接到它).只需跳过过程的这一步即可.

Postmaster is the main PostgreSQL process. You're trying to start PostgreSQL that's already running (and you're saying yourself you can connect to it). Just skip that step of your process.

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