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bootc-install-to-filesystem - Man Page

Install to an externally created filesystem structure


bootc install to-filesystem [--root-mount-spec] [--boot-mount-spec] [--replace] [--acknowledge-destructive] [--skip-finalize] [--source-imgref] [--target-transport] [--target-imgref] [--enforce-container-sigpolicy] [--target-ostree-remote] [--skip-fetch-check] [--disable-selinux] [--karg] [--root-ssh-authorized-keys] [--generic-image] [-h|--help] <ROOT_PATH>


Install to an externally created filesystem structure.

In this variant of installation, the root filesystem alongside any necessary platform partitions (such as the EFI system partition) are prepared and mounted by an external tool or script. The root filesystem is currently expected to be empty by default.



Source device specification for the root filesystem.  For example, UUID=2e9f4241-229b-4202-8429-62d2302382e1

If not provided, the UUID of the target filesystem will be used.


Mount specification for the /boot filesystem.

This is optional. If `/boot` is detected as a mounted partition, then its UUID will be used.


Initialize the system in-place; at the moment, only one mode for this is implemented. In the future, it may also be supported to set up an explicit "dual boot" system

Possible values:

  • wipe: Completely wipe the contents of the target filesystem.  This cannot be done if the target filesystem is the one the system is booted from
  • alongside: This is a destructive operation in the sense that the bootloader state will have its contents wiped and replaced.  However, the running system (and all files) will remain in place until reboot

If the target is the running system's root filesystem, this will skip any warnings


The default mode is to "finalize" the target filesystem by invoking `fstrim` and similar operations, and finally mounting it readonly.  This option skips those operations.  It is then the responsibility of the invoking code to perform those operations


Install the system from an explicitly given source.

By default, bootc install and install-to-filesystem assumes that it runs in a podman container, and it takes the container image to install from the podman's container registry. If --source-imgref is given, bootc uses it as the installation source, instead of the behaviour explained in the previous paragraph. See skopeo(1) for accepted formats.

--target-transport=TARGET_TRANSPORT [default: registry]

The transport; e.g. oci, oci-archive, containers-storage.  Defaults to `registry`


Specify the image to fetch for subsequent updates


This is the inverse of the previous `--target-no-signature-verification` (which is now a no-op).  Enabling this option enforces that `/etc/containers/policy.json` includes a default policy which requires signatures


Enable verification via an ostree remote


By default, the accessiblity of the target image will be verified (just the manifest will be fetched). Specifying this option suppresses the check; use this when you know the issues it might find are addressed.

A common reason this may fail is when one is using an image which requires registry authentication, but not embedding the pull secret in the image so that updates can be fetched by the installed OS "day 2".


Disable SELinux in the target (installed) system.

This is currently necessary to install *from* a system with SELinux disabled but where the target does have SELinux enabled.


Add a kernel argument.  This option can be provided multiple times.

Example: --karg=nosmt --karg=console=ttyS0,114800n8


The path to an `authorized_keys` that will be injected into the `root` account.

The implementation of this uses systemd `tmpfiles.d`, writing to a file named `/etc/tmpfiles.d/bootc-root-ssh.conf`.  This will have the effect that by default, the SSH credentials will be set if not present.  The intention behind this is to allow mounting the whole `/root` home directory as a `tmpfs`, while still getting the SSH key replaced on boot.


Perform configuration changes suitable for a "generic" disk image. At the moment:

- All bootloader types will be installed - Changes to the system firmware will be skipped

-h,  --help

Print help (see a summary with '-h')


Path to the mounted root filesystem.

By default, the filesystem UUID will be discovered and used for mounting. To override this, use `--root-mount-spec`.



Referenced By


bootc 0.1.13