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Diffstat (limited to 'doc/apt_preferences.5.xml')
| -rw-r--r-- | doc/apt_preferences.5.xml | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/doc/apt_preferences.5.xml b/doc/apt_preferences.5.xml index 4ef5282e7..23f2d2d6b 100644 --- a/doc/apt_preferences.5.xml +++ b/doc/apt_preferences.5.xml @@ -102,7 +102,8 @@ algorithm to set the priorities of the versions of a package. Assign: <term>priority 1</term> <listitem><simpara>to the versions coming from archives which in their <filename>Release</filename> files are marked as "NotAutomatic: yes" but <emphasis>not</emphasis> as "ButAutomaticUpgrades: yes" -like the Debian <literal>experimental</literal> archive.</simpara></listitem> +like the Debian <literal>experimental</literal> archive.</simpara></listitem>, +as well as versions that are not phased on this systems. </varlistentry> <varlistentry> @@ -175,6 +176,22 @@ because at least <emphasis>one</emphasis> of the available versions has a higher priority than the installed version.</para> </refsect2> +<refsect2><title>Phased Updates</title> +<para>APT understands a field called <literal>Phased-Update-Percentage</literal> +which can be used to control the rollout of a new version. It is an integer between +0 and 100.</para> + +<para>A system's eligibility to a phased update is determined by seeding +random number generator with the package source name, the version number, +and /etc/machine-id, and then calculating an integer in the range [0, 100]. +If this integer is larger than the <literal>Phased-Update-Percentage</literal>, +the version is pinned to 1, and thus held back. Otherwise, normal policy rules apply. +</para> + +<para>In case you have multiple systems that you want to receive the same set of updates, you can set +<code>APT::Machine-ID</code> to a UUID such that they all phase the same, or set <code>APT::Get::Never-Include-Phased-Updates</code> +or <code>APT::Get::Always-Include-Phased-Updates</code> to true such that APT will never/always consider phased updates.</para> +</refsect2> <refsect2><title>The Effect of APT Preferences</title> <para>The APT preferences file allows the system administrator to control the |