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``INSTANCE_ID`` will be set to the current instance id for all run
commands. Commands can be specified either as lists or strings. For
invocation details, see ``runcmd``.
.. note::
bootcmd should only be used for things that could not be done later
in the boot process.
.. note::
when writing files, do not use /tmp dir as it races with
systemd-tmpfiles-clean LP: #1707222. Use /run/somedir instead.
z� bootcmd:
- echo 192.168.1.130 us.archive.ubuntu.com > /etc/hosts
- [ cloud-init-per, once, mymkfs, mkfs, /dev/vdb ]
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