Installing cron via apt-get fails in a docker ubuntu:12.04 container from permissions problems
I’m attempting to install cron (among other packages) via apt-get install in my Dockerfile.
I’ve simplified my Dockerfile down to a bare minimum of:
FROM ubuntu:12.04 RUN apt-get update RUN apt-get install -y cron
The error that I’m seeing during the install process is:
Step 4 : RUN apt-get install -y cron ---> Running in 991339f4be58 Reading package lists... Building dependency tree... Reading state information... Suggested packages: anacron logrotate checksecurity exim4 postfix mail-transport-agent The following NEW packages will be installed: cron 0 upgraded, 1 newly installed, 0 to remove and 12 not upgraded. Need to get 85.0 kB of archives. After this operation, 308 kB of additional disk space will be used. Get:1 http://archive.ubuntu.com/ubuntu/ precise-updates/main cron amd64 3.0pl1-120ubuntu4 [85.0 kB] debconf: delaying package configuration, since apt-utils is not installed Fetched 85.0 kB in 0s (204 kB/s) Selecting previously unselected package cron. (Reading database ... 7551 files and directories currently installed.) Unpacking cron (from .../cron_3.0pl1-120ubuntu4_amd64.deb) ... Setting up cron (3.0pl1-120ubuntu4) ... Adding group `crontab' (GID 102) ... groupadd: failure while writing changes to /etc/group addgroup: `/usr/sbin/groupadd -g 102 crontab' returned error code 10. Exiting. dpkg: error processing cron (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: cron E: Sub-process /usr/bin/dpkg returned an error code (1) 2014/07/03 10:09:13 The command [/bin/sh -c apt-get install -y cron] returned a non-zero code: 100
Running $ groupadd /etc/group manually inside the docker container results in the same error “groupadd: failure while writing changes to /etc/group”.
Other packages such as wget and curl are installed fine. Is there a process that docker needs to have running to be able to perform groupadds? Or is there a step in the Dockerfile that needs to happen first that I’m missing?
Thanks in advance.
One Solution collect form web for “Installing cron via apt-get fails in a docker ubuntu:12.04 container from permissions problems”
I had to disable SELinux on my fedora machine running docker. Doing a setenforce 0, editing /etc/selinux/conf to disabled and rebooting my machine fixed it. I didn’t realize that my docker container would inherit permissions problems from the machine running it.