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@@ -4,10 +4,12 @@ page_keywords: Docker, Docker documentation, requirements, linux, centos, epel,
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# CentOS
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-While the Docker package is provided by default as part of CentOS-7,
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-it is provided by a community repository for CentOS-6. Please note that
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-this changes the installation instructions slightly between versions.
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-
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+While the Docker package is provided by default as part of CentOS-7,
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+it is provided by the EPEL repository for CentOS-6. Please note that
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+this changes the installation instructions slightly between versions. If you
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+need the latest version, you can always use the latest binary which works on
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+kernel 3.8 and above.
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+
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These instructions work for CentOS 6 and later. They will likely work for
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other binary compatible EL6 distributions such as Scientific Linux, but
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they haven't been tested.
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@@ -25,6 +27,30 @@ simply run the following command.
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$ sudo yum install docker
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+### Manual installation of latest version
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+
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+While using a package is the recommended way of installing Docker,
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+the above package might not be the latest version. If you need the latest
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+version, [you can install the binary directly](
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+https://docs.docker.com/installation/binaries/).
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+
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+When installing the binary without a package, you may want
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+to integrate Docker with systemd. For this, simply install the two unit files
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+(service and socket) from [the github
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+repository](https://github.com/docker/docker/tree/master/contrib/init/systemd)
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+to `/etc/systemd/system`.
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+
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+### FirewallD
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+
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+CentOS-7 introduced firewalld, which is a wrapper around iptables and can
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+conflict with Docker.
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+
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+When firewalld is started or restarted it will remove the `DOCKER` chain
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+from iptables, preventing Docker from working properly.
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+
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+When using systemd, firewalld is started before Docker, but if you
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+start or restart firewalld after Docker, you will have to restart the Docker daemon.
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+
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## Installing Docker - CentOS-6
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Please note that this for CentOS-6, this package is part of [Extra Packages
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for Enterprise Linux (EPEL)](https://fedoraproject.org/wiki/EPEL), a community effort
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Sven Dowideit