我有一个构建过程,通过将它们安装在docker容器中来操作一些软盘映像(文件)。
一个容器运行良好,但如果我运行第二个容器,我不能安装任何东西,虽然我使用不同的循环设备。
如果我然后回到第一个容器并做一个umount
我可以安装在第二个容器中没有任何问题。
有两种行为我观察到mount命令永远挂起或者它立即失败:
mount: /tmp/ng-mmi7Ao-NGFW-Fresh-72x-Box/NGFW-Fresh-72x-Box.flp: failed to setup loop device: No such file or directory
任何想法如何解决这个问题所以我能够通过多个容器上的环回接口挂载图像?
额外细节:
容器概述并尝试在第二个容器中安装软盘映像:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4181a8e5e8c7 10.0.0.201:5000/jenkins_autotest_slave:latest "/usr/local/bin/setu…" 40 hours ago Up 40 hours 127.0.0.1:32800->22/tcp gallant_saha
0218fdce8ed7 10.0.0.201:5000/jenkins_autotest_slave:latest "/usr/local/bin/setu…" 47 hours ago Up 47 hours 127.0.0.1:32798->22/tcp reverent_feistel
[qa@jenkins-staging ~]$ docker exec -ti 4181 bash
[root@4181a8e5e8c7 /]# sudo /usr/bin/mount -o loop=/dev/loop1,uid=1000 /tmp/ng-mmi7Ao-NGFW-Fresh-72x-Box/NGFW-Fresh-72x-Box.flp /tmp/ng-mmi7Ao-NGFW-Fresh-72x-Box/mp
mount: /tmp/ng-mmi7Ao-NGFW-Fresh-72x-Box/NGFW-Fresh-72x-Box.flp: failed to setup loop device: No such file or directory
[root@4181a8e5e8c7 /]# exit
现在卸载第一个容器
[qa@jenkins-staging ~]$ docker exec -ti 0218fdce8ed7 bash
[root@0218fdce8ed7 /]# sudo umount /tmp/ng-blabla-NGFW-Fresh-72x-Box/mp ## UMOUNT SO OTHER COTAINER CAN MOUNT
[root@0218fdce8ed7 /]# exit
现在第二个容器可以装载
[qa@jenkins-staging ~]$ docker exec -ti 4181 bash
[root@4181a8e5e8c7 /]# sudo /usr/bin/mount -o loop=/dev/loop1,uid=1000 /tmp/ng-mmi7Ao-NGFW-Fresh-72x-Box/NGFW-Fresh-72x-Box.flp /tmp/ng-mmi7Ao-NGFW-Fresh-72x-Box/mp
[root@4181a8e5e8c7 /]# exit ### MOUNT WAS SUCCESSFULL IN SECOND CONTAINER
在第一个容器中再试一次:
[qa@jenkins-staging ~]$ docker exec -ti 0218fdce8ed7 bash
[root@0218fdce8ed7 /]# date
Tue Apr 16 13:50:28 UTC 2019
[root@0218fdce8ed7 /]# sudo /usr/bin/mount -o loop=/dev/loop0,uid=1000 /tmp/ng-blabla-NGFW-Fresh-72x-Box/NGFW-Fresh-72x-Box.flp /tmp/ng-blabla-NGFW-Fresh-72x-Box/mp # MOUNT KEEPS HANGING NOW ON FIRST CONTAINER
^C
[root@0218fdce8ed7 /]# date
Tue Apr 16 13:57:21 UTC 2019
Docker和OS版本:
[qa@jenkins-staging ~]$ docker -v
Docker version 18.09.5, build e8ff056
[qa@jenkins-staging ~]$ uname -a
Linux jenkins-staging 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
[qa@jenkins-staging ~]$ cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
Docker运行命令:
docker run --privileged --device-cgroup-rule="b 7:* rmw" -p :22 10.0.0.201:5000/jenkins_autotest_slave:latest qa@jenkins-staging"
虽然我不知道为什么docker / linux / mount表现得如此愚蠢,我找到了一个解决方法(或者说更好的解决方案),因为我的问题是允许在不挂载的情况下创建软盘映像。
create a virtual floppy image without mount?
另外,这有一个好处,它不需要任何额外的权限,所以我可以做一个没有docker run
的--privileged --device-cgroup-rule="b 7:* rmw"