解決GitLab提交MergeRequest時，提示502 GitLab is not responding.的問題

最近使用GitLab提交MergeRequest時，提示502 GitLab is not responding。

使用gitlab-ctl tail檢視錯誤資訊如下：

2016/06/28 11:50:50 [error] 6565#0: *1 upstream prematurely closed connection while reading response header from upstream, client: 1
0.xx.xx.xx, server: 10.xx.xx.xx, request: "GET /xxx/webopinion/merge_requests/new?utf8=%E2%9C%93&merge_request%5Bsource_project_id
%5D=6&merge_request%5Bsource_branch%5D=develop&merge_request%5Btarget_project_id%5D=4&merge_request%5Btarget_branch%5D=develop HTTP/
1.1", upstream: "http://unix:/home/gitlab/gitlab-rails/tmp/sockets/gitlab.socket:/xxx/webopinion/merge_requests/new?utf8=%E2%9C%9
3&merge_request%5Bsource_project_id%5D=6&merge_request%5Bsource_branch%5D=develop&merge_request%5Btarget_project_id%5D=4&merge_reque
st%5Btarget_branch%5D=develop", host: "10.xx.xx.xx", referrer: "http://10.xx.xx.xx/xxx/webopinion/merge_requests/new"

原因及解決方案

上面的問題是由於unicron的超時時間設定偏低，再加上我用的伺服器效能不好導致的。

解決方案：

修改檔案{GIT_LAB}/gitlab-rails/etc/unicorn.rb，將其中的timeout修改的高一些，比如90，然後gitlab-ctl restart重新啟動即可。

更多GitLab相關教學見以下內容：

Ubuntu 14.04下安裝GitLab指南  http://www.linuxidc.com/Linux/2015-12/126876.htm

如何在Ubuntu Server 14.04下安裝Gitlab中文版  http://www.linuxidc.com/Linux/2015-12/126875.htm

CentOS原始碼安裝GitLab漢化版  http://www.linuxidc.com/Linux/2015-10/124648.htm

在 Ubuntu 12.04 上安裝 GitLab http://www.linuxidc.com/Linux/2012-12/75249.htm

GitLab 5.3 升級注意事項 http://www.linuxidc.com/Linux/2013-06/86473.htm

在 CentOS 上部署 GitLab (自託管的Git專案倉庫) http://www.linuxidc.com/Linux/2013-06/85754.htm

在RHEL6/CentOS6/ScientificLinux6上安裝GitLab 6.0.2 http://www.linuxidc.com/Linux/2014-03/97831.htm

CentOS 6.5安裝GitLab教學及相關問題解決 http://www.linuxidc.com/Linux/2014-05/101526.htm

升級GitLab到8.2.0  http://www.linuxidc.com/Linux/2015-12/126220.htm