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把玩jenkins docker镜像遇到的volume权限问题

image

这两天在玩jenkins,但是在挂在数据卷的时候遇到了权限问题,如下,

docker启动命令

docker run -d -v /root/jenkins:/var/jenkins_home -P --name jenkins-server jenkins

这个命令看似没有什么问题,但容器就是启动不起来,执行docker ps -a,查看container,如下,

[root@esslog-shqs-6 ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                     PORTS               NAMES
274d92964edb        jenkins             "/bin/tini -- /usr/lo"   2 minutes ago       Exited (1) 2 minutes ago                       jenkins-server

接着执行docker logs jenkins-server查看container日志,如下

Can not write to /var/jenkins_home/copy_reference_file.log. Wrong volume permissions?
touch: cannot touch ‘/var/jenkins_home/copy_reference_file.log’: Permission denied

日志中出现了一个Permission denied错误,,以我目前的功力还不清楚是什么问题造成的,但是在谈谈Docker Volume 之权限管理持续集成(Continuous integration)两篇博客中找到了答案,在执行docker run命令的时候增加一个-u参数,如下改进后的命令,

docker run -d -v /root/jenkins:/var/jenkins_home -u 0 -P --name jenkins-server jenkins

这命令的意思是覆盖容器中内置的帐号,该用外部传入,这里传入0代表的是root帐号Id。这样再启动的时候就应该没问题了。

如果按照上面做还是出现Permission denied错误,那么可以检查一下selinux状态,开启的情况下会导致一些服务安装、使用不成功。

查看selinux状态,

[root@localhost ~]# sestatus  
SELinux status:                 enabled  
SELinuxfs mount:                /sys/fs/selinux  
SELinux root directory:         /etc/selinux  
Loaded policy name:             targeted  
Current mode:                   enforcing  
Mode from config file:          enforcing  
Policy MLS status:              enabled  
Policy deny_unknown status:     allowed  
Max kernel policy version:      28

临时关闭,

[root@localhost ~]# setenforce 0

永久关闭,可以修改配置文件/etc/selinux/config,将其中SELINUX设置为disabled,如下,

[root@localhost ~]# cat /etc/selinux/config   
   
# This file controls the state of SELinux on the system.  
# SELINUX= can take one of these three values:  
#     enforcing - SELinux security policy is enforced.  
#     permissive - SELinux prints warnings instead of enforcing.  
#     disabled - No SELinux policy is loaded.  
#SELINUX=enforcing  
SELINUX=disabled  
# SELINUXTYPE= can take one of three two values:  
#     targeted - Targeted processes are protected,  
#     minimum - Modification of targeted policy. Only selected processes are protected.   
#     mls - Multi Level Security protection.  
SELINUXTYPE=targeted
 
[root@rdo ~]# sestatus  
SELinux status:                 disabled

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参考文章:

http://www.cnblogs.com/99fu/p/6042744.html

https://yq.aliyun.com/articles/53990

http://blog.csdn.net/one_clouder/article/details/39224767

http://www.orcs.cc/post/6.html