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Cloud-init is a third-party tool that can automate a variety of system initial configurations for Linux virtual machines. As a non-resident service, cloud-init only performs actions during the virtual machine's boot process, and will quit immediately when it's done. Therefore, it does not keep any monitoring ports open.
AVE supports cloud-init, allowing you to create virtual machines from templates that have cloud-init configured. New virtual machines built from the templates will contain the initialization data and will be automatically configured on their first boot.
Below are the configurations supported by cloud-init:
Hostname.
Default user's password.
The default user configured by cloud-init is root.
SSH public keys for remote login.
DNS server.
IP address. DHCP and static IP configuration are supported.
Custom user data. You can automate more configurations by configuring scripts.
You can refer to the official cloud-init documentation for more details about cloud-init.
You can only have one cloud.cfg file under the /etc/cloud/ configuration file path. Any other cloud.cfg files, even if displayed as cloud.cfg_bak, under this path will cause the root user's failure to use the system once booted.