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HTTP 502: Whoops, GitLab is taking too much time to respond.

撸了今年阿里、腾讯和美团的面试,我有一个重要发现.......>>

最近有台云上的服务器需要释放,然后上面跑的 gitlab 也要挪个地方,因资源有限,于是借在其他的服务器上搭建环境(可用内存小于4G),然鹅启动的时候莫名出现 502,Excuse me?接着搜了一些 issue 博客上的解决方案(如修改端口、重启或 hup 某个服务)无果,后来在调整的过程中从日志里发现了一些信息。

这次排错过程主要是思路,视野打开后会觉得豁然开朗,原来这其实是个小问题。

1、不清楚应用启动的各服务以及用途,只会简单查看 status;

2、看到错误第一时间想到的是 Baidu(没其他意思),找找 logpath 先看日志不好吗?

3、未认识到服务之间的关联关系(比如 postgresql 与 unicorn 之间),前面一直知道 unicorn 启动后没正常监听到端口,但是日志并没啥特别信息(嗯,可能是因为看错了文件)[苦笑]

一、错误信息

二、排错过程

1、启动 unicorn 未监听端口

日志路径 :   /var/log/gitlab/unicorn/unicorn_stderr.log

PG::ConnectionBad: could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/var/opt/gitlab/postgresql/.s.PGSQL.5432"?

  /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `initialize'
  /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `new'
  /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `connect'
  /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize'
  /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `new'
  /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/activerecord-4.2.10/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `postgresql_connection'

··· ···
··· ···

信息显示是因为连不上PG,所以启动 postgresql 后重启即可正常(嗯,是这样的)。

 

2、postgresql down

down: postgresql: 0s, normally up, want up; run: log: (pid 623) 15816094s

通过 PG 的日志路径 : /var/log/gitlab/postgresql/current 可以查看到如下信息

2018-11-01_08:18:09.49669 FATAL:  could not map anonymous shared memory: Cannot allocate memory
2018-11-01_08:18:09.49671 HINT:  This error usually means that PostgreSQL's request for a shared memory segment exceeded available memory, swap space, or huge pages. To reduce the request size (currently 4292984832 bytes), reduce PostgreSQL's shared memory usage, perhaps by reducing shared_buffers or max_connections.
2018-11-01_08:18:09.49671 LOG:  database system is shut down

也可以通过命令 `gitlab-ctl tail postgresql`,得到一样的信息,于是可以确定问题。。

This error usually means that PostgreSQL's request for a shared memory segment exceeded available memory, swap space, or huge pages. To reduce the request size (currently 4292984832 bytes), reduce PostgreSQL's shared memory usage, perhaps by reducing shared_buffers or max_connections.
2018-11-01_07:52:06.63024 LOG:  database system is shut down

于是在配置文件中对 postgresql 的 shared_buffers 和 max_connections 两项进行了限制

[root@V2 ~]# cat /etc/gitlab/gitlab.rb |grep -v ^$ |grep -v ^#
external_url 'http://xxx.xxx.xxx.xxx.xxx:8090'
unicorn['worker_timeout'] = 60
unicorn['worker_processes'] = 3
unicorn['listen'] = 'xxx.xxx.xxx.xxx.xxx'
unicorn['port'] = 8870
postgresql['enable'] = true
postgresql['data_dir'] = "/var/opt/gitlab/postgresql/data"
postgresql['shared_buffers'] = "256MB"   # ! **recommend value is 1/4 of total RAM, up to 14GB.**      
postgresql['max_connections'] = 200
nginx['listen_addresses'] = ['*']
nginx['listen_port'] = 8090

配置完成保存,之后更新配置,重启应用即可。

gitlab-ctl reconfigure   # 更新配置
gitlab-ctl restart       # 重启应用
gitlab-ctl status        # 查看服务状态

 

 

 

 

参考资料:

1. 502-Whoops, GitLab is taking too much time to respond

2. gitlab安装以及安装过程中遇到的问题

3. Postgresql down

4. centos7安装部署gitlab服务器

5. 我所遇到的GitLab 502问题的解决

6. HTTP 502: Whoops, GitLab is taking too much time to respond. Even after Server restart


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