How to customize cloud-init

This article introduces you how to customize cloud-init, the content is very detailed, interested friends can refer to, hope to be helpful to you.

For Linux images, cloud-init is responsible for initializing instance. Cloud-init is very powerful and can do a lot of things, and we can flexibly customize cloud-init by modifying the configuration file.

The configuration file of cloud-init is / etc/cloud/cloud.cfg. Here are several application scenarios:

1. If you want root to log in to instance directly (root login is not allowed by default), set:

Disable_root: 0

two。 If you want to be able to log in as ssh passwod (by default, you can only log in through private key), set:

Ssh_pwauth: 1

3. If you want to be able to modify the hostname of instance (by default, cloud-init will restore the hostname to its original value after each restart of instance), delete or comment out the following two items in the cloud_init_modules list:

-set_hostname

-update_hostname

Instance performs initialization every time it starts cloud-init. If you want to change the initialization behavior of all instance, modify the mirrored / etc/cloud/cloud.cfg file; if you only want to change the initialization behavior of an instance, modify the / etc/cloud/cloud.cfg of instance directly.

There are many options for cloud-init, and only a few common customization scenarios are listed here to give you an important idea: you can change the initialization behavior of instance through cloud-init. Please refer to the official website https://cloud-init.io/ for more information

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