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Using cloud-init with Scaleway API and CLI

Cloud-init is a package that contains utilities for early initialization of cloud Instances. It enables automatic configuration of cloud Instances as it boots into the cloud, turning it from a generic Ubuntu image into a configured server in a few seconds, quickly and easily.

The cloud-init program is available on recent distributions (Ubuntu, Fedora, Debian) and can consume and execute data from the user-data field of the Scaleway service. This process behaves differently depending on the format of the information it finds. One of the most popular formats for scripts within user-data is the cloud-config file format.

Cloud-config files are special scripts designed to be run by the cloud-init process. These are generally used for initial configuration on the very first boot of a server.

Before you start

To complete the actions presented below, you must have:

Provisioning your Instance with Cloud-Init

You can give provisioning instructions to cloud-init using the cloud-init key of the user_data facility.

For user_data to be effective, it has to be added prior to the creation of the Instance since cloud-init gets activated early in the first phases of the boot process.

  • Server ID refers to the unique identification string of your server. It will be displayed when you create your server. You can also recover it from the list of your servers, by typing scw instance server list.

  1. Create your Instance by specifying the path to your cloud-init configuration file.

    scw instance server create image=ubuntu_focal name=myinstance cloud-init=@/path/to/cloud-config-file
    Note

    @/path/to/cloud-config-file is the path of your Cloud-Init configuration file. Edit it as you wish.

  2. Start your Instance

    scw start {server Id}

    Since version 2.3.1 of the Scaleway CLI a shorter command is available:

    scw instance server create image=ubuntu_focal name=myinstance cloud-init=@/path/to/cloud-config-file

Cloud-Init CLI (Command Line Interface)

The command line documentation is accessible on any cloud-init installed system.

% cloud-init --help
usage: cloud-init [-h] [--version] [--file FILES]

                  [--debug] [--force]
                  {init,modules,single,dhclient-hook,features,analyze,devel,collect-logs,clean,status}
                  ...

optional arguments:
  -h, --help            show this help message and exit
  --version, -v         show program's version number and exit
  --file FILES, -f FILES
                        additional yaml configuration files to use
  --debug, -d           show additional pre-action logging (default: False)
  --force               force running even if no datasource is found (use at
                        your own risk)

Subcommands:
  {init,modules,single,dhclient-hook,features,analyze,devel,collect-logs,clean,status}
    init                initializes cloud-init and performs initial modules
    modules             activates modules using a given configuration key
    single              run a single module
    dhclient-hook       run the dhclient hookto record network info
    features            list defined features
    analyze             Devel tool: Analyze cloud-init logs and data
    devel               Run development tools
    collect-logs        Collect and tar all cloud-init debug info
    clean               Remove logs and artifacts so cloud-init can re-run.
    status              Report cloud-init status or wait on completion.

For detailed information on cloud-init, refer to the official cloud-init documentation.

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