Immutable Root Filesystem
The immutable rootfs concept in cOS is provided by a dracut module which is basically the contents of the immutable-rootfs package provided as part of the cOS repository tree.
By default, cos and derivatives will inherit an immutable setup.
A running system will look like as follows:
/usr/local - persistent (COS_PERSISTENT)
/oem - persistent (COS_OEM)
/etc - ephemeral
/usr - read only
/ immutable
This means that any changes that are not specified as cloud-init configuration are not persisting across reboots.
You can place persisting cloud-init files either in /oem or /usr/local/oem, cOS already supports cloud-init datasources, so you can use also load cloud-init configuration as standard userdata, depending on the platform. For more details on the cloud-init syntax, see the cloud-init configuration reference.
Note
You can check the package documentation reference for a detailed explaination of the configuration and how to override default settings. Immutability, as of other aspects, can be disabled.Feedback
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