gitlab 升级到5.0的严重注意事项
我这里只讨论从4.2到5.0升级过程，并且用的是Nginx和启用HTTPS配置。

第一，使用正确的版本的gitlab-shell

参考升级文档https:-//github.-com/gitlabhq/gitlabhq/wiki/From-4.2-to-5.0

注意其中第二步，git clone gitlab-shell之后要立刻让gitlab-shell切换到v1.1.0 tag.

先查看一下有几个tag

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01.root@ubuntu1204-dell:/home/git/gitlab-shell# git tag 
02.v1.0.3 
03.v1.1.0 
04.v1.2.0 
root@ubuntu1204-dell:/home/git/gitlab-shell# git tag
v1.0.3
v1.1.0
v1.2.0

然后查找v1.1.0的commit id论文网 

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01.git log --oneline --decorate 
02.e8d93d0 (HEAD, tag: v1.1.0, master) up to 1.1.0 
git log --oneline --decorate
e8d93d0 (HEAD, tag: v1.1.0, master) up to 1.1.0

然后用reset命令切到这个tag

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01.git reset --hard e8d93d0 
git reset --hard e8d93d0
第二步，修改gitlab-shell中的配置文件

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01.# Url to gitlab instance. Used for api calls                                                                                                   
02.gitlab_url: "# Url to gitlab instance. Used for api calls                                                                                                 
gitlab_url: "

这里要用https, 注意最后/结尾

第三步，让gitlab-shell访问本地gitlab server的REST API时禁止启用SSL证书
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01.so i had to add string not to check certificate at /home/git/gitlab-shell/lib/gitlab_net.rb 
02.from: 
03. 
04.http = Net::HTTP.new(url.host, url.port) 
05.http.use_ssl = (url.port == 443) 
06.request = Net::HTTP::Get.new(url.request_uri) 
07.http.start {|http| http.request(request) } 
08.to: 
09

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