Docker数据卷容器。我似乎无法备份

问题描述

阅读这些链接：

2. 然后在：

   （在这种情况下不是 / var / db 但 / root ）

   因此，在这种情况下， z 或 Z 是合适的，但通常可能更喜欢 Z 为隔离。

   
   

   Reading these links:

   1. https://docs.docker.com/userguide/dockervolumes/#backup-restore-or-migrate-data-volumes
   2. Backing up data volume containers off machine

   My understanding is I can take a data volume container and archive its backup.However reading the first link I can't seem to get it to work.

   docker create -v /sonatype-work --name sonatype-work sonatype/nexus /bin/true
   

   I launch sonatype/nexus image in a container using:

   --volumes-from sonatype-nexus
   

   All good, after running nexus, i inspect the data volume, i can see the innards created, and stop and remove nexus and start again, all changes saved.

   CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
   f84abb054d2e        sonatype/nexus      "/bin/sh -c 'java   -"   22 seconds ago      Up 21 seconds       0.0.0.0:8081->8081/tcp   nexus
   1aea2674e482        sonatype/nexus      "/bin/true"              25 seconds ago      Created                                      sonatype-work
   

   I want to now back up sonatype-work, but with no luck.

   [root@ansible22 ~]# pwd
   /root
   [root@ansible22 ~]# docker run --volumes-from sonatype-work -v $(pwd):/backup ubuntu tar cvf /backup/sonatype-work-backup.tar /sonatype-work
   tar: /backup/sonatype-work-backup.tar: Cannot open: Permission denied
   tar: Error is not recoverable: exiting now
   

   I have tried running as -u root, I also tried with:

   /root/sonatype-work-backup.tar
   

   When doing so, i can see it taring stuff, but I don't see the tar file. Based on the example and my understanding I don't think thats right anyway.

   Can anyone see what I'm doing wrong?

   EDIT: Linux Version Info

   Fedora release 22 (Twenty Two)
   NAME=Fedora
   VERSION="22 (Twenty Two)"
   ID=fedora
   VERSION_ID=22
   PRETTY_NAME="Fedora 22 (Twenty Two)"
   ANSI_COLOR="0;34"
   CPE_NAME="cpe:/o:fedoraproject:fedora:22"
   HOME_URL="https://fedoraproject.org/"
   BUG_REPORT_URL="https://bugzilla.redhat.com/"
   REDHAT_BUGZILLA_PRODUCT="Fedora"
   REDHAT_BUGZILLA_PRODUCT_VERSION=22
   REDHAT_SUPPORT_PRODUCT="Fedora"
   REDHAT_SUPPORT_PRODUCT_VERSION=22
   PRIVACY_POLICY_URL=https://fedoraproject.org/wiki/Legal:PrivacyPolicy
   VARIANT="Server Edition"
   VARIANT_ID=server
   Fedora release 22 (Twenty Two)
   Fedora release 22 (Twenty Two)
   

   解决方案

   The reason for this is related to selinux labelling. There are a couple of good Project Atomic pages on this:

   Docker and Linux

   Then in Using Volumes with Docker can Cause Problems with SELinux:

   (In this case not /var/db but /root)

   So either z or Z are suitable in this case but one might usually prefer Z for the isolation.

   这篇关于Docker数据卷容器。我似乎无法备份的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！