/usr/share/doc/cloud-init/examples/cloud-config-boot-cmds.txt is in cloud-init 0.7.7~bzr1212-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #cloud-config
# boot commands
# default: none
# this is very similar to runcmd, but commands run very early
# in the boot process, only slightly after a 'boothook' would run.
# bootcmd should really only be used for things that could not be
# done later in the boot process. bootcmd is very much like
# boothook, but possibly with more friendly.
# * bootcmd will run on every boot
# * the INSTANCE_ID variable will be set to the current instance id.
# * you can use 'cloud-init-boot-per' command to help only run once
bootcmd:
- echo 192.168.1.130 us.archive.ubuntu.com > /etc/hosts
- [ cloud-init-per, once, mymkfs, mkfs, /dev/vdb ]
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