如何实现Git服务间同步

Posted 2021-03-01

好久没写博客了，虽然也没写几篇^_^...露个脸，表示还活跃在互联网行业中...不说没用的了，分享一下如何实现Git服务间的同步。
Git服务我们一般多会使用gitlab-rake工具定时做备份，当出现问题时利用备份恢复，那是否有一种需求是另外一个环境也需要部署一套Git服务，且需要和前一套Git服务去同步的，即使做冷备，既省去了恢复时间，也达到了定时做恢复演练的目的。
目前我们另外一个环境就遇到了这样的需求，当然可以研究学习Git API去实现，但由于目前需求对同步实时性要求不高，于是我准备用一个直接简单粗暴的方式来实现，其实就是拿Git备份去另外一套环境做自动恢复，交互问题我们交给expect工具来解决。
下面分别分享下Python和Shell脚本作为参考学习，同步时间则可以调整定时备份的时间及恢复时间即可，内容大同小异，思路基本一致：

#!/usr/bin/python
# -*- coding: utf-8 -*-

import os
import sys
import pexpect
import paramiko

# 备份服务器的IP地址、用户名
git_src_host = "xxx.xxx.xxx.xxx"
git_src_user = "xxx"
git_src_port = "22"
# 地址自行根据环境变更
private_key  = paramiko.RSAKey.from_private_key_file(‘/xxx/xxx/xxx/.ssh/id_rsa‘)

git_bak_dir  = "/var/opt/gitlab/backups"

# Copy backup to xxx.xxx.xxx.xxx(查找备份服务器一天以内的备份传到恢复服务器所在备份目录)

try:
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh.connect(
        hostname=git_src_host,
        username=git_src_user,
        port=git_src_port,
        password=private_key)

    cmd=("find " + git_bak_dir + " -type f -ctime -1")
    stdin, stdout, stderr = ssh.exec_command(cmd)

    for item in stdout.readlines():
        chown_cmd="chown git:git " + git_bak_dir + "/*;chmod 700 " + git_bak_dir
        rsync_cmd=(‘rsync -avzP ‘
                    + git_src_user + ‘@‘
                    + git_src_host + ‘:‘
                    + item.strip(‘
‘) + ‘ ‘
                    + git_bak_dir)

        #print(rsync_cmd)
        os.system(rsync_cmd)
        os.system(chown_cmd)

    ssh.close()
except Exception, e:
    print e

# Restore backup

ls_cmd="ls -t " + git_bak_dir + " |         head -n 1 |         sed -r ‘s/^([0-9]+_[0-9]+_[0-9]+_[0-9]+_.*)_gitlab_backup.tar/\1/g‘"

rs=os.popen(ls_cmd)
restore_file=rs.read()
# print(restore_file)

os.system("gitlab-ctl stop unicorn;gitlab-ctl stop sidekiq")

expectations=["Do you want to continue (yes/no)?","Do you want to continue (yes/no)?",]
child = pexpect.spawn(‘gitlab-rake gitlab:backup:restore BACKUP=‘ + restore_file,timeout=1800)
child.logfile = sys.stdout
while True:
    try:
        i = child.expect(expectations)
        if i == 0:
            child.sendline(‘yes‘)
        elif i == 1:
            child.sendline(‘yes‘)
    except pexpect.EOF:
        print(‘Exiting fexpect for EOF.‘)
        break

os.system("gitlab-ctl restart")

#!/bin/bash
#

git_src_host="xxx.xxx.xxx.xxx"
git_src_user="xxx"

git_bak_dir="/var/opt/gitlab/backups"
git_bak_file=`ssh ${git_src_user}@${git_src_host} "find ${git_bak_dir} -type f -ctime -1"`

# Copy backup to xxx.xxx.xxx.xxx

for bakfiles in $git_bak_file ; do

    echo "------------------------------------"
    rsync -avzP ${git_src_user}@${git_src_host}:${bakfiles} ${git_bak_dir}
    echo $bakfiles
    echo "------------------------------------"

done

chown git:root $git_bak_dir
chmod 700 $git_bak_dir

# Restore backup

restore_file=`ls -t $git_bak_dir | head -n 1 | sed -r ‘s/^([0-9]+_[0-9]+_[0-9]+_[0-9]+_.*)_gitlab_backup.tar/1/g‘`

gitlab-ctl stop unicorn
gitlab-ctl stop sidekiq

/bin/expect <<EOF
set time 30
spawn gitlab-rake gitlab:backup:restore BACKUP=$restore_file
expect "Do you want to continue (yes/no)?" { 
    send "yes
";
}
expect "Do you want to continue (yes/no)?" { 
    send "yes
";
}
expect "Do you want to continue (yes/no)?" { 
    send "yes
";
}
expect "Do you want to continue (yes/no)?" { 
    send "yes
";
}
expect "Do you want to continue (yes/no)?" { 
    send "yes
";
}
expect eof
EOF

#gitlab-ctl reconfigure
gitlab-ctl restart