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gitlab搭建之互备模式

gitlab搭建之互备模式

前言:gitlab目前默认的部署方式是本地单机部署,为了提高gitlab环境的可靠性和稳定性,必须构建一套互备搭建方案:借助gitolilte的mirror功能可以实现此功能;

搭建环境:

2台服务器 -- RedHat 5.4

内核版本 -- linux 2.6.18 x86_64

概要:

1. 搭建两套gitlab标准环境

2. 构建互备模式

1. 搭建两套gitlab标准环境

  参考之前博文:http://www.cnblogs.com/lenolix/archive/2013/02/06/2906466.html

      这里假设两台gitlab环境分别是A和B,在下文中,$A:代表在A机中操作,$B:代表在B机中操作

2. 配置A、B环境的互访权限

     关于gitolite的mirror功能请参考官方文档:http://gitolite.com/gitolite/mirroring.html

     1. 克隆本地的gitolite-admin.git

$A: sudo -u gitlab -H git clone git@localhost:gitolite-admin.git  /home/gitlab/gitolite-admin
$B: sudo -u gitlab -H git clone git@localhost:gitolite-admin.git /home/gitlab/gitolite-admin

  2. 修改.gitolilte.rc 设置hostname

$A: sudo -u git -H vi /home/git/.gitolite.rc       修改 HOSTNAME                    =>  ‘hostA‘,$B: sudo -u git -H vi /home/git/.gitolite.rc       修改 HOSTNAME                    =>  ‘hostB‘,

  3. 更新gitolite的配置,添加A、B主机的互访权限

#更新A、B主机上gitlab账户的配置,这一步很重要,因为A、B的gitolite账户体系中都有gitlab账户,但是其ssh-key是不一样的,如果同步成相同的值,会影响其中一套gitlab环
#境的运行,解决方案是给gitlab账户更换用户名,并且在A、B上都添加gitlab账户,避免同步覆盖
$A: sudo -u git mv /home/git/.gitolite/keydir/gitlab.pub /home/git/.gitolite/keydir/gitlab-hostA.pub
$A: sudo -u git scp /home/git/.gitolite/keydir/gitlab-hostA.pub git@hostB:/home/git/.gitolite/keydir/
$A: sudo -u git vi /home/git/.gitolite/conf/gitolite.conf
添加:
      repo gitolite-admin
           RW+ = gitlab-hostA
           RW+ = gitlab-hostB
$B: sudo -u git mv /home/git/.gitolite/keydir/gitlab.pub /home/git/.gitolite/keydir/gitlab-hostB.pub
$B: sudo -u git scp /home/git/.gitolite/keydir/gitlab-hostB.pub git@hostA:/home/git/.gitolite/keydir
$B: sudo -u git vi /home/git/.gitolite/conf/gitolite.conf
添加:
      repo gitolite-admin
           RW+ = gitlab-hostA
           RW+ = gitlab-hostB
 
#添加A、B主机上git账户的互访权限
$A: sudo -u git -H ssh-keygen $A: sudo cp /home/git/.ssh/id_rsa.pub /tmp/server-hostA.pub$A: sudo -u git -H cp /tmp/server-hostA.pub /home/git/.gitolite/keydir/$A: sudo scp /tmp/server-hostA.pub git@B:home/git/.gitolite/keydir/
$A: sudo -u git -H vi /home/git/.gitolite/conf/gitolite.conf
添加:
repo @all
RW+ = gitlab-host47
RW+ = gitlab-host48
RW+ = server-host47
RW+ = server-host48
$B: sudo -u git -H ssh-keygen $B: sudo cp /home/git/.ssh/id_rsa.pub /tmp/server-hostB.pub$B: sudo -u git-H cp /tmp/server-hostB.pub /home/git/.gitolite/keydir
$B: sudo scp /tmp/server-hostB.pub git@A:home/gitlab/.gitolite/keydir/
$B: sudo -u git -H vi /home/git/.gitolite/conf/gitolite.conf
添加:
repo @all
RW+ = gitlab-host47
RW+ = gitlab-host48
RW+ = server-host47
RW+ = server-host48
#重新安装gitolite,更新conf
$A: sudo -u git /home/git/bin/gitolite setup
$B: sudo -u git /home/git/bin/gitolite setup

#安装ssh key,很奇怪,用setup只能更新授权配置,却不能更新keydir中的key,没办法,这里只能再搞一次
$A: sudo cd /home/gitlab/gitolite-admin
$A: sudo -u gitlab -H git pull (这里你会发现更新之后,conf/gitolite.conf已经更新了,但是keydir/里面却没有新添的文件)
$A: sudo cp /home/git/.gitolite/keydir/* keydir/
$A: sudo chown -R gitlab:git keydir/
$A: sudo -u gitlab git add keydir/*
$A: sudo -u gitlab git commit -m "update"
$A: sudo -u gitlab git push

$B: sudo cd /home/gitlab/gitolite-admin
$B: sudo -u gitlab -H git pull
$B: sudo cp /home/git/.gitolite/keydir/* keydir/
$B: sudo chown -R gitlab:git keydir/
$B: sudo -u gitlab git add keydir/*
$B: sudo -u gitlab git commit -m "update"
$B: sudo -u gitlab git push

      4. 配置ssh的config文件

$A: sudo -u git -H vi /home/git/.ssh/confighost hostB  user git  hostname hostB‘s ip/hostname  port 22  identityfile ~/.ssh/id_rsa
$A: sudo -u git -H chmod 644 /home/git/.ssh/config$B: sudo -u git -H vi /home/git/.ssh/confighost hostA user git hostname hostA‘s ip/hostname port 22 identityfile ~/.ssh/id_rsa
$B: sudo -u git -H chmod 644 /home/git/.ssh/config

  测试连通性

$A: sudo -u git ssh hostB$B: sudo -u git ssh hostA

  如果出现 " hello server-hostA/B, this is ..." 就表示A、B的连通性没有问题

      测试gitlab账户的配置

$A :sudo -u gitlab -H git clone git@localhost:gitolite-admin.git /tmp/gitolite-admin$A: rm -rf /tmp/gitolite-admin$B :sudo -u gitlab -H git clone git@localhost:gitolite-admin.git /tmp/gitolite-admin$B: rm -rf /tmp/gitolite-admin

  如果能正常clone,说明配置正确

 3. 借助post-receive hooks,实现实时同步

$A: sudo -u git -H vi home/git/.gitolite/hooks/common/post-receive 添加:repo_name=`pwd`repo_name=${repo_name#*/home/git/repositories/}repo_name=${repo_name%.git*}/home/git/bin/gitolite mirror push hostB $repo_name > /dev/null 2>&1$B: sudo -u git -H vi home/git/.gitolite/hooks/common/post-receive 添加:repo_name=`pwd`repo_name=${repo_name#*/home/git/repositories/}repo_name=${repo_name%.git*}/home/git/bin/gitolite mirror push hostA $repo_name > /dev/null 2>&1

  修改下gitolite的代码,去除一个权限限制:

$A: sudo -u git /home/git/gitolite/src/commands/mirror 修改:sub valid_slave {    my ( $host, $repo ) = @_;     _die "invalid repo ‘$repo‘" unless $repo =~ $REPONAME_PATT;    #注释掉下面几行    #my $ref = git_config( $repo, "^gitolite-options\\.mirror\\.slaves.*" );    #my %list = map { $_ => 1 } map { split } values %$ref;    #_die "‘$host‘ not a valid slave for ‘$repo‘" unless $list{$host};}

 4. 测试

  在A的环境上创建一个仓库 root/p1, 然后提交代码,你会发现B上面也创建了/root/p1仓库,然后通过B修改仓库代码,可以发现A上面的代码也修改了.

      如果这个测试可以通过,那么恭喜你,gitlab的互备模式已经构建成功了!

 5. 后续

      待解决问题:  

  1. 虽然仓库可以同步,但是satellites不能同步,这样的话在线提交的功能就不能用。

         暂时解决方案:在主备切换的时候,需要手动执行下 rake gitlab:enable_automerge RAILS_ENV=production, 重新生成satellites

      2. 主备模式的缺点是资源利用率低,总是有一台服务器处于空闲状态

         优化方案:在互备模式的基础上实现分布式部署,在通过VIP做LoadBlance,提供机器利用率和系统性能 。(进行中...)

      3. 数据库目前是主备模式(master-master),但是没有实现主备的自动切换,需要手动支持。

 6. 补充问题

      1. 在使用Http协议提交代码的时候,发现很奇怪的问题,我将错误输出重定向到/tmp/mirror.log

      vi /home/git/.gitolite/hooks/common/post-receive 

      /home/git/bin/gitolite mirror push hostA $repo_name >/tmp/mirror.log 2>&1

      发现错误信息:

      FATAL: errors found before logfile could be created

      FATAL:unknown host hostA 

      。。。

      通过跟踪gitolite的mirror命令执行过程,发现问题所在:

      http协议提交代码的功能是gilab的web服务器支持的,而gitlab的WEB服务是以gitlab的用户身份运行的,导致post-receive这个钩子脚本也是以gitlab的用户身份调用的,这样就会以gitlab用户的上下文环境来执行脚本,所以会触发很过奇怪的问题

       解决方案:

       vi /home/git/.gitolite/hooks/common/post-receive

       更改:

#强制指定HOME变量
export HOME=/home/gitrepo_name=`pwd`repo_name=${repo_name#*/home/git/repositories/}repo_name=${repo_name%.git*}
#这里也明确指定ssh的host地址,不能使用git账户的ssh/config配置/home/git/bin/gitolite mirror push git@hostA‘s ip $repo_name > /dev/null 2>&1

      vi /home/git/gitolite/src/lib/Gitolite/Common.pm

      更改gitolite源码,修改日志文件的访问权限,允许git组账户可写

sub gl_log {    # the log filename and the timestamp come from the environment.  If we get    # called even before they are set, we have no choice but to dump to STDERR    # (and probably call "logger").    # tab sep if there‘s more than one field    my $msg = join( "\t", @_ );    $msg =~ s/[\n\r]+/<<newline>>/g;    my $ts = gen_ts();    my $tid = $ENV{GL_TID} ||= $$;     my $fh;    logger_plus_stderr( "errors found before logging could be setup", "$msg" ) if not $ENV{GL_LOGFILE};    chmod 0664,$ENV{GL_LOGFILE}; #更改日志访问属性    open my $lfh, ">>", $ENV{GL_LOGFILE}      or logger_plus_stderr( "errors found before logfile could be created", "$msg" );    print $lfh "$ts\t$tid\t$msg\n";    close $lfh;}

gitlab搭建之互备模式