Running commands during boot using cloud-init
When bootstrapping a new server or instance, the first boot is often very different from all the other boots the instance will experience in its life, and most often we want some commands to be executed very early or very late in the boot process. For example, let's say our cloud instance is launched with an attached block storage. We might want to format this storage space and be sure it's mounted on the host, but while we always want the disk to mount, we probably don't want it to be formatted at each boot! The bootcmd directive is there to handle everything related to commands to be executed very early in the boot process, while the runcmd directive is executed much later in the boot process (and only once).
Note
bootcmd will be executed at every boot of the instance.
Getting ready
To step through this recipe, you will need:
Access to a cloud-config enabled infrastructure
How to do it…
We'll launch three commands during boot. The first one is a...
