How to backup and restore gitlab in docker

Backup

??进入要备份的主机，执行备份操作命令。

[root@xtwj27 ~]# docker exec -t gitlab gitlab-backup create STRATEGY=copy
2019-12-12 02:44:13 +0000 -- Dumping database ... 
Dumping PostgreSQL database gitlabhq_production ... [DONE]
2019-12-12 02:44:16 +0000 -- done
2019-12-12 02:44:16 +0000 -- Dumping repositories ...* xtwj/doc/default (@hashed/4e/07/4e07408562bedb8b60ce05c1decfe3ad16b72230967de01f640b7e4729b49fce) ... [DONE]
[DONE] Wiki* xtwj/sample/spring-cloud-alibaba-sample (@hashed/7a/61/7a61b53701befdae0eeeffaecc73f14e20b537bb0f8b91ad7c2936dc63562b25) ... [DONE]
[SKIPPED] Wiki
2019-12-12 02:45:31 +0000 -- done
2019-12-12 02:45:31 +0000 -- Dumping uploads ... 
2019-12-12 02:45:32 +0000 -- done
2019-12-12 02:45:32 +0000 -- Dumping builds ... 
2019-12-12 02:45:32 +0000 -- done
2019-12-12 02:45:32 +0000 -- Dumping artifacts ... 
2019-12-12 02:45:32 +0000 -- done
2019-12-12 02:45:32 +0000 -- Dumping pages ... 
2019-12-12 02:45:32 +0000 -- done
2019-12-12 02:45:32 +0000 -- Dumping lfs objects ... 
2019-12-12 02:45:32 +0000 -- done
2019-12-12 02:45:32 +0000 -- Dumping container registry images ... 
2019-12-12 02:45:32 +0000 -- [DISABLED]
Creating backup archive: 1576118732_2019_12_12_12.4.0_gitlab_backup.tar ... done
Uploading backup archive to remote storage  ... skipped
Deleting tmp directories ... done
done
done
done
done
done
done
done
Deleting old backups ... skipping
Warning: Your gitlab.rb and gitlab-secrets.json files contain sensitive data 
and are not included in this backup. You will need these files to restore a backup.
Please back them up manually.
Backup task is done.
[root@xtwj27 ~]# 

Restore

??备份完成以后，我们接下来需要进入gitlab容器中做如下两件事：
（1）将目录/etc/gitlab/里面文件gitlab-secrets.json和gitlab.rb传输到待恢复的目标主机上gitlab容器中相应的位置。
（2）将目录 /var/opt/gitlab/backups/里面的*_gitlab_backup.tar文件传输到待恢复的目标主机上gitlab容器中相应的位置。

??这里，我们先进入源主机gitlab容器中，查看相关文件。

[root@xtwj27 ~]# docker exec -it gitlab /bin/bash
root@gitlab:/# ll /etc/gitlab/
total 136
drwxrwxr-x. 4 root root   250 Oct 31 02:27 ./
drwxr-xr-x. 1 root root    22 Oct 24 07:29 ../
-rw-------. 1 root root 15453 Oct 31 02:36 gitlab-secrets.json
-rw-------. 1 root root 96439 Oct 24 08:01 gitlab.rb
-rw-------. 1 root root   227 Oct 24 07:29 ssh_host_ecdsa_key
-rw-r--r--. 1 root root   182 Oct 24 07:29 ssh_host_ecdsa_key.pub
-rw-------. 1 root root   411 Oct 24 07:29 ssh_host_ed25519_key
-rw-r--r--. 1 root root   102 Oct 24 07:29 ssh_host_ed25519_key.pub
-rw-------. 1 root root  1679 Oct 24 07:29 ssh_host_rsa_key
-rw-r--r--. 1 root root   402 Oct 24 07:29 ssh_host_rsa_key.pub
drwxr-xr-x. 2 root root    95 Oct 24 07:59 ssl/
drwxr-xr-x. 2 root root     6 Oct 24 07:30 trusted-certs/
root@gitlab:/# ll -h /var/opt/gitlab/backups/
total 1.2G
drwx------.  2 git  root   60 Dec 12 02:46 ./
drwxr-xr-x. 20 root root 4.0K Oct 31 02:36 ../
-rw-------.  1 git  git  1.2G Dec 12 02:46 1576118732_2019_12_12_12.4.0_gitlab_backup.tar
root@gitlab:/# exit
exit
[root@xtwj27 ~]#

??接下来，我们从容器中将相关文件复制到宿主机上。

[root@xtwj27 ~]# docker cp gitlab:/etc/gitlab/gitlab-secrets.json data/
[root@xtwj27 ~]# docker cp gitlab:/etc/gitlab/gitlab.rb data/
[root@xtwj27 data]# docker cp gitlab:/var/opt/gitlab/backups/1576118732_2019_12_12_12.4.0_gitlab_backup.tar ./
[root@xtwj27 ~]# ll data/
total 16
drwxr-xr-x. 2 root root    33 Dec 12 11:01 .
dr-xr-x---. 6 root root   203 Dec 11 17:03 ..
-rw-------. 1 root root 96439 Oct 24 08:01 gitlab.rb
-rw-------. 1 root root 15453 Oct 31 10:36 gitlab-secrets.json
[root@xtwj27 data]#root@xtwj27 data]#

??传输相关备份文件到目录主机

[root@xtwj27 data]# scp gitlab-secrets.json 192.168.3.78:~/
gitlab-secrets.json                                                                                                                                                                                         100%   15KB   2.1MB/s   00:00    
[root@xtwj27 data]# scp gitlab.rb 192.168.3.78:~/
gitlab.rb                                                                                                                                                                                                          100%   94KB   2.1MB/s   00:00    
[root@xtwj27 data]# scp 1576118732_2019_12_12_12.4.0_gitlab_backup.tar 192.168.3.78:~/
1576118732_2019_12_12_12.4.0_gitlab_backup.tar                                                                                                                                                              100% 1146MB  10.9MB/s   01:45    
[root@xtwj27 data]#

??进入目标主机，将相关文件从宿主机复制到gitlab容器中。

[root@xtwj78 ~]# docker cp 1576118732_2019_12_12_12.4.0_gitlab_backup.tar gitlab:/var/opt/gitlab/backups/
[root@xtwj78 ~]#
[root@xtwj78 ~]# docker exec -it gitlab /bin/bash
root@gitlab:/# ll -h /var/opt/gitlab/backups/
total 1.2G
drwx------.  2 git  root   60 Dec 12 03:36 ./
drwxr-xr-x. 20 root root 4.0K Dec 12 01:52 ../
-rw-------.  1 root root 1.2G Dec 12 03:35 1576118732_2019_12_12_12.4.0_gitlab_backup.tar
root@gitlab:/# exit
exit
[root@xtwj78 ~]# docker exec -it gitlab gitlab-backup restore
Unpacking backup ... tar: 1576118732_2019_12_12_12.4.0_gitlab_backup.tar: Cannot open: Permission denied
tar: Error is not recoverable: exiting now
unpacking backup failed
[root@xtwj78 ~]# docker exec -it gitlab /bin/bash
root@gitlab:/# ll /var/opt/gitlab/backups/
total 1173984
drwx------.  2 git  root         60 Dec 12 03:36 ./
drwxr-xr-x. 20 root root       4096 Dec 12 01:52 ../
-rw-------.  1 root root 1202155520 Dec 12 03:35 1576118732_2019_12_12_12.4.0_gitlab_backup.tar
root@gitlab:/# chown git:git /var/opt/gitlab/backups/1576118732_2019_12_12_12.4.0_gitlab_backup.tar 
root@gitlab:/# exit
exit
[root@xtwj78 ~]# docker exec -it gitlab gitlab-backup restore
Unpacking backup ... done
GitLab version mismatch:Your current GitLab version (12.5.4) differs from the GitLab version in the backup!Please switch to the following version and try again:version: 12.4.0Hint: git checkout v12.4.0
[root@xtwj78 ~]# 

这说明，主机xtwj78上的gitlab docker image tag与主机xtwj27上的gitlab docker image tag不一致。究其原因是因为在启动docker容器的时候，我们采用如下的命令：

docker run --detach \
--publish 443:443 --publish 80:80 --publish 2222:22 \
--name gitlab \
--restart always \
--volume /opt/gitlab/config:/etc/gitlab \
--volume /opt/gitlab/logs:/var/log/gitlab \
--volume /opt/gitlab/data:/var/opt/gitlab \
gitlab/gitlab-ce:latest

而latest始终指向最新版本的gitlab docker image tag，这就导致过一段时间以后，再次执行上述命令，就会导致安装的版本不一致。

这个时候，为了系统迁移成功，我们必须使目标主机上的gitlab docker image tag与源主机上的的gitlab docker image tag保持一致，于是，我们需要将目标主机上的gitlab docker container实例停机并删除掉，用如下命令重新启动一个实例。

[root@xtwj78 ~]# cd /opt/gitlab/
[root@xtwj78 gitlab]# rm -rf *
[root@xtwj78 gitlab]# mkdir -p config logs data
[root@xtwj78 gitlab]# cd
[root@xtwj78 ~]# tree /opt/gitlab/
/opt/gitlab/
├── config
├── data
└── logs3 directories, 0 files
[root@xtwj78 ~]#

docker run --detach \
--publish 443:443 \
--publish 80:80 \
--publish 2222:22 \
--name gitlab \
--restart always \
--volume /opt/gitlab/config:/etc/gitlab \
--volume /opt/gitlab/logs:/var/log/gitlab \
--volume /opt/gitlab/data:/var/opt/gitlab \
gitlab/gitlab-ce:12.4.0-ce.0

参考文献

• GitLab Docker images
• Backing up and restoring GitLab
• Gitlab Installation
• 【Linux】【gitlab】gitlab安装、备份、恢复、升级、内存消耗问题
  -plantuml/plantuml-server