在Ubuntu上运行docker：挂载主机卷不能从容器写入 [英] Running docker on Ubuntu: mounted host volume is not writable from container

问题描述

Docker对于Mac而言在Mac上表现非常出色，但是由于Mac内核不支持docker，所以我必须在VirtualBox（或Parallels或VMWare Fusion）中运行Docker主机。

所以我试图在Ubuntu桌面上设置我的应用程序和docker-compose，其中docker客户端和docker主机都在同一个系统上运行。这是有效的，但是我的运行中的docker容器不能写入挂载的主机卷。

我使用docker-compose进行以下设置：

 卷：
  -  ./api:/usr/src/app 
  

所以我将主机Ubuntu操作系统的api目录装载到/ usr / src / app下的docker容器中。

docker inspect< container ID> 显示该卷可写

 Destination：/ usr / src / app，
Mode：rw，
RW：true 
  / pre> 
 
 
但是它不是：当我尝试创建目录或编辑文件时，我得到权限被拒绝从Docker容器中。
 
 
 
当然，我在google上搜索了这个问题，我遇到了几个关于CentOS / RHEL的SELinux问题，但是运行Ubuntu 15.10,64位版本，而不是CentOS。
解决方案
如果您的 uid 在主机上与$ docker容器中的用户的 uid 不一样（通常是docker）， id -u  ）那么你可以有这个问题。您可以尝试：
 
 
使您的用户和Docker容器中的用户之间的UID相同。
 
  
 
您还可以使用核选项：
 
 
  chmod a + rwx -R project-dir / 
  
 
 
 
核选项将使您的 git 工作空间污秽，这将大大刺激您，所以不是最好的长期解决方案。 
 
 
 
为了进一步了解问题，您可能会发现这些有用：
 
 
  https://github.com/docker/docker/issues/7906 
 
 
  https://github.com/docker/docker / issues / 7198  
 
 
 
Docker works great on a Mac for me, but I have to run docker host inside of a VirtualBox (or Parallels, or VMWare Fusion), since Mac's kernel doesn't support docker.

So I tried to setup my application and a docker-compose on an Ubuntu Desktop - natively, where both docker client and docker host run physically on the same system. This worked, but my running docker containers can't write into a mounted host volume.

I use docker-compose with the following settings:
volumes:
   - ./api:/usr/src/app
So I'm mounting the "api" directory of the host Ubuntu OS into docker container under /usr/src/app.

docker inspect <container ID> shows that the volume is writable
"Destination": "/usr/src/app",
"Mode": "rw",
"RW": true
However it is not: I get permission denied when I try to create a directory or edit a file from within the docker container.

I googled for this issue, of course, and I came across a few SELinux issues of CentOS/RHEL, but I'm running Ubuntu 15.10, 64 bit edition, not CentOS.
解决方案
If your uid on the host (id -u) isn't the same as the uid of the user in the docker container (often "docker") then you can have this problem.  You can try:

Making the UIDs the same between your user and the user in the docker container.
Setting the group permissions on the directory to be writable for a group that both you and docker belong to.
You could also use the nuclear option:
chmod a+rwx -R project-dir/


The nuclear option will make your git workspace filthy, which will annoy you greatly, so isn't the best long-term solution.  It stops the bleeding tho.

For further understanding the problem, you might find these useful:  

https://github.com/docker/docker/issues/7906
https://github.com/docker/docker/issues/7198


                        
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