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Index: head/en_US.ISO8859-1/books/handbook/jails/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/handbook/jails/chapter.xml
+++ head/en_US.ISO8859-1/books/handbook/jails/chapter.xml
@@ -535,8 +535,33 @@
to maintain jails instead. Use <option>-b</option> to specify
the path of the jail to be updated.</para>
+ <para>To update the jail to the latest patch release of the
+ version of &os; it is already running, then execute the
+ following commands on the host:</para>
+
<screen>&prompt.root; <userinput>freebsd-update -b <replaceable>/here/is/the/jail</replaceable> fetch</userinput>
&prompt.root; <userinput>freebsd-update -b <replaceable>/here/is/the/jail</replaceable> install</userinput></screen>
+
+ <para>To upgrade the jail to a new major or minor version,
+ first upgrade the host system as described in
+ <xref linkend="freebsdupdate-upgrade" />. Once the host has been
+ upgraded and rebooted, the jail can then be upgraded.
+ For example to upgrade from 12.0-RELEASE to 12.1-RELEASE,
+ on the host run:</para>
+
+ <screen>&prompt.root; <userinput>freebsd-update -b <replaceable>/here/is/the/jail</replaceable> --currently-running <replaceable>12.0-RELEASE</replaceable> -r <replaceable>12.1-RELEASE</replaceable> upgrade</userinput>
+&prompt.root; <userinput>freebsd-update -b <replaceable>/here/is/the/jail</replaceable> install</userinput>
+&prompt.root; <userinput>service jail restart <replaceable>myjail</replaceable></userinput>
+&prompt.root; <userinput>freebsd-update -b <replaceable>/here/is/the/jail</replaceable> install</userinput></screen>
+
+ <para>Then, if it was a major version upgrade, reinstall all
+ installed packages and restart the jail again. This is
+ required because the ABI version changes when upgrading
+ between major versions of &os;. From the host:</para>
+
+ <screen>&prompt.root; <userinput>pkg -j <replaceable>myjail</replaceable> upgrade -f</userinput>
+&prompt.root; <userinput>service jail restart <replaceable>myjail</replaceable></userinput></screen>
+
</sect2>
</sect1>

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