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Spacewalk Red Hat Satellite v5 in a Docker container PoC
Spacewalk was the upstream project to provide a Linux systems management layer on which Red Hat Satellite was based, was based at least until RH Satellite version 5. Newer versions are not anymore based on Spacewalk, instead Satellite is a federation of several upstream open source projects, including Katello, Foreman, Pulp, and Candlepin.
Some weeks ago, a friend asked me if I knew a Docker container image for Satellite. | I have not found any image. What I found was some Spacewalk images, but sadly none of them worked for me. | I decided to create an image for this purpose.
While developing the image, I found serious troubles to make it run with systemd (I\'m a fan of systemd, but not inside containers yet). | The result was a semi functional working image. I said semi functional because some Spacewalk features are not working (probably an issue with systemd again). | The main problem was that spacewalk-setup script starts and uses systemd to configure the database and the other needed services, that\'s OK in a VM but not in a container. | So i needed to hack into postgres setup and start the services with the typical
command --config-file file.conf executed from supervisord as Docker entrypoint. Currently there is an issue with osa-dispatcher, on which I can\'t find a fix to make it run.This image is primarily created just for test Spacewalk interface and be more comfortable with it aka testing/development purposes, or just to have fun hacking with Docker containers.
Now, I\'m going to make a short description of what the Dockerfile makes and then start the container. | Have fun.
I used centos as image base for this PoC
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FROM centos:7
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Typical Maintainer line
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MAINTAINER Eduardo Gonzalez Gutierrez
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Add jpackage repo which provides Java packages for Linux
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COPY jpackage-generic.repo /etc/yum.repos.d/jpackage-generic.repo
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Install EPEL and Spacewalk repositories, after install, clean all stored cache to minimize image size
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RUN yum install -y http://yum.spacewalkproject.org/2.5/RHEL/7/x86_64/spacewalk-repo-2.5-3.el7.noarch.rpm \
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epel-release && \
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yum clean all
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Import Keys to allow installation from these repositories
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RUN rpm --import http://www.jpackage.org/jpackage.asc && \
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rpm --import https://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7 && \
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rpm --import http://yum.spacewalkproject.org/RPM-GPG-KEY-spacewalk-2015 && \
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yum clean all
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Install spacewalk and supervisord packages
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RUN yum -y install \
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spacewalk-setup-postgresql \
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spacewalk-postgresql \
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supervisor \
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yum clean all
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Copy the example file used to sync spacewalk database in a later step
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COPY answerfile.txt /tmp/answerfile.txt
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Open necessary ports
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EXPOSE 80 443 5222 68 69
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Change to postgres user
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USER postgres
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Initialize the database
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RUN /usr/bin/pg_ctl initdb -D /var/lib/pgsql/data/
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Create spacewalk database, user, role and create pltclu language
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RUN /usr/bin/pg_ctl start -D /var/lib/pgsql/data/ -w -t 300 && \
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psql -c 'CREATE DATABASE spaceschema' && \
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psql -c "CREATE USER spaceuser WITH PASSWORD 'spacepw'" && \
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psql -c 'ALTER ROLE spaceuser SUPERUSER' && \
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createlang pltclu spaceschema
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Change to root user
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USER root
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Start the database and execute spacewalk configuration script
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RUN su -c "/usr/bin/pg_ctl start -D /var/lib/pgsql/data/ -w -t 300" postgres && \
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su -c "spacewalk-setup --answer-file=/tmp/answerfile.txt --skip-db-diskspace-check --skip-db-install" root ; exit 0
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Copy supervisord configuration
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ADD supervisord.conf /etc/supervisord.d/supervisord.conf
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Use supervisord command to start all services at container launch time
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ENTRYPOINT supervisord -c /etc/supervisord.d/supervisord.conf
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You can check or download the source code at GitHub https://github.com/egonzalez90/docker-spacewalk​
I uploaded the image to DockerHub, which is auto-build from my GitHub repository, you can find it with the following command.
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[[email protected] ~]$ docker search spacewalk
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INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED
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docker.io docker.io/ruo91/spacewalk Spacewalk is an open source Linux systems ... 3 [OK]
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docker.io docker.io/jamesnetherton/spacewalk Spacewalk running under Docker 1
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docker.io docker.io/coffmant/spacewalk-docker Spacewalk 0 [OK]
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docker.io docker.io/csabakollar/spacewalk Spacewalk 2.4 in a CentOS6 container 0
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docker.io docker.io/egonzalez90/spacewalk Spacewalk docker image 0 [OK]
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docker.io docker.io/jdostal/spacewalk-clients Repository containing spacewalk-clients 0
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docker.io docker.io/jhutar/spacewalk-client 0
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docker.io docker.io/norus/spacewalk-reposync 0
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docker.io docker.io/pajinek/spacewalk-client 0 [OK]
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docker.io docker.io/perfectweb/spacewalk spacewalk 0 [OK]
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docker.io docker.io/researchiteng/docker-spacewalk spacewalk is the open source version of Re... 0 [OK]
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docker.io docker.io/varhoo/spacewalk-proxy 0 [OK]
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To start the container use the following command. If you don\'t have the image locally, it will download the image from DockerHub
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[[email protected] ~]$ docker run -d --privileged=True egonzalez90/spacewalk
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Unable to find image 'egonzalez90/spacewalk:latest' locally
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Trying to pull repository docker.io/egonzalez90/spacewalk ...
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latest: Pulling from docker.io/egonzalez90/spacewalk
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a3ed95caeb02: Already exists
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da71393503ec: Already exists
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519093688e2c: Pull complete
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97bbffaa9fc9: Pull complete
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63bfb115f62d: Pull complete
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929bbb68aff9: Pull complete
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532bc4af8e1a: Pull complete
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3eb667dda9ee: Pull complete
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275894897aa4: Pull complete
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93bcddf9cedb: Pull complete
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266c3b70754f: Pull complete
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Digest: sha256:a4dd98548f9dbb405fb4c6bb4a2a07b83d5f2bf730f29f71913b72876b1a61ab
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Status: Downloaded newer image for docker.io/egonzalez90/spacewalk:latest
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ded4a8b7eb1ee61fecc8ddc2eb1b092917a361bc36f7f752b32d76e79501d70a
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Now you have the container running, check if all the ports are properly exposed
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[[email protected] ~]$ docker ps --latest --format 'table {{.ID}}\t{{.Image}}\t{{.Ports}}'
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CONTAINER ID IMAGE PORTS
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ded4a8b7eb1e egonzalez90/spacewalk 68-69/tcp, 80/tcp, 443/tcp, 5222/tcp
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Get the container IP address in order to enter from a Web Browser
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[[email protected] ~]$ docker inspect ded4a8b7eb1e | egrep IPAddress
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"SecondaryIPAddresses": null,
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"IPAddress": "172.17.0.3",
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"IPAddress": "172.17.0.3",
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| Open A browser and go to the container IP address, if you use HTTP, by default it will redirect you to HTTPS. | The container uses an auto-signed SSL certificate, you have to add an exception in the Browser you use to allow connections to Spacewalk. | Once in the Welcome page, create an Organization.
| Now you are in Spacewalk and can play/test some features.
| There is an issue I was not able to fix, so osa-dispatcher and some other features will not work with this image. | If someone can give me an input to fix the issue it will appreciated.
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[[email protected] ~]$ docker logs ded4a8b7eb1e | egrep FATAL
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2016-07-12 18:13:32,220 INFO gave up: osa-dispatcher entered FATAL state, too many start retries too quickly
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Thanks for your time and hopes this image at least serves you to learn and play with the interface.
Regards, Eduardo Gonzalez
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