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rl-21.03: describe EC2 instance user/meta data reloading

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This commit is contained in:
Jack Kelly 2020-11-21 11:59:30 +10:00
parent 43bfd7e5b1
commit 6fd871dec4
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nixos/doc/manual/release-notes/rl-2103.xml
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@ -211,6 +211,22 @@
and <literal>slaptest</literal> is buggy with schemas directly in the config file.
</para>
</listitem>
<listitem>
<para>
Amazon EC2 and OpenStack Compute (nova) images now re-fetch instance meta data and user data from the instance
metadata service (IMDS) on each boot. For example: stopping an EC2 instance, changing its user data, and
restarting the instance will now cause it to fetch and apply the new user data.
</para>
<warning>
<para>
Specifically, <literal>/etc/ec2-metadata</literal> is re-populated on each boot. Some NixOS scripts that read
from this directory are guarded to only run if the files they want to manipulate do not already exist, and so
will not re-apply their changes if the IMDS response changes. Examples: <literal>root</literal>'s SSH key is
only added if <literal>/root/.ssh/authorized_keys</literal> does not exist, and SSH host keys are only set from
user data if they do not exist in <literal>/etc/ssh</literal>.
</para>
</warning>
</listitem>
</itemizedlist>
</section>