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130 lines
4.7 KiB
XML
130 lines
4.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
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<article>
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<!--$Id$-->
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<articleinfo>
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<title>Docker Support</title>
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<authorgroup>
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<author>
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<firstname>Tom</firstname>
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<surname>Eastep</surname>
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</author>
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<author>
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<surname>J Cliff Armstrong</surname>
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</author>
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</authorgroup>
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<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
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<copyright>
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<year>2016</year>
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<year>2020</year>
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<holder>Thomas M. Eastep</holder>
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</copyright>
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<legalnotice>
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<para>Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version
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1.2 or any later version published by the Free Software Foundation; with
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no Invariant Sections, with no Front-Cover, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled
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<quote><ulink url="GnuCopyright.htm">GNU Free Documentation
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License</ulink></quote>.</para>
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</legalnotice>
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</articleinfo>
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<section>
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<title>Shorewall 5.0.5 and Earlier</title>
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<para>Both Docker and Shorewall assume that they 'own' the iptables
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configuration. This leads to problems when Shorewall is restarted or
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reloaded, because it drops all of the rules added by Docker. Fortunately,
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the extensibility features in Shorewall allow users to <ulink
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url="https://blog.discourse.org/2015/11/shorewalldocker-two-great-tastes-that-taste-great-together/#">create
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their own solution</ulink> for saving the Docker-generated rules before
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these operations and restoring them afterwards.</para>
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</section>
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<section>
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<title>Shorewall 5.0.6 and Later</title>
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<para>Beginning with Shorewall 5.0.6, Shorewall has native support for
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simple Docker configurations. This support is enabled by setting
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DOCKER=Yes in shorewall.conf. With this setting, the generated script
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saves the Docker-created ruleset before executing a
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<command>stop</command>, <command>start</command>,
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<command>restart</command> or <command>reload</command> operation and
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restores those rules along with the Shorewall-generated ruleset.</para>
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<important>
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<para>Shorewall currently doesn't support Docker Swarm mode.</para>
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</important>
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<warning>
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<para>On Debian and Debian-derived systems, <command>systemctl restart
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shorewall</command> will lose Docker rules. You can work around this
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issue using a method provided by J Cliff Armstrong:</para>
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<para>Type as root:</para>
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<programlisting><command>systemctl edit shorewall.service</command></programlisting>
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<para>This will open the default terminal editor to a blank file in
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which you can paste the following:</para>
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<programlisting>[Service]
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# reset ExecStop
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ExecStop=
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# set ExecStop to "stop" instead of "clear"
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ExecStop=/sbin/shorewall $OPTIONS stop
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</programlisting>
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<para> Then type <command>systemctl daemon-reload </command>to activate
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the changes. This change will survive future updates of the shorewall
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package from apt repositories. The override file itself will be saved to
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`/etc/systemd/system/shorewall.service.d/`. </para>
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</warning>
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<para>This support assumes that the default Docker bridge (docker0) is
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being used. It is recommended that this bridge be defined to Shorewall in
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<ulink
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url="manpages/shorewall-interfaces.html">shorewall-interfaces(8)</ulink>.
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As shown below, you can control inter-container communication using the
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<option>bridge</option> and <option>routeback</option> options. If docker0
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is not defined to Shorewall, then Shorewall will save and restore the
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FORWARD chain rules involving that interface.</para>
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<para><filename>/etc/shorewall/shorewall.conf</filename>:</para>
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<programlisting>DOCKER=Yes</programlisting>
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<para><filename>/etc/shorewall/zones</filename>:</para>
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<programlisting>#ZONE TYPE OPTIONS
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dock ipv4 #'dock' is just an example -- call it anything you like</programlisting>
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<para><filename>/etc/shorewall/policy</filename>:</para>
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<programlisting>#SOURCE DEST POLICY LEVEL
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dock $FW REJECT
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dock all ACCEPT</programlisting>
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<para><filename>/etc/shorewall/interfaces</filename>:</para>
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<programlisting>#ZONE INTERFACE OPTIONS
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dock docker0 bridge #Allow ICC (bridge implies routeback=1)</programlisting>
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<para>or</para>
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<programlisting>#ZONE INTERFACE OPTIONS
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dock docker0 bridge,routeback=0 #Disallow ICC</programlisting>
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</section>
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</article>
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