12.2. Modifying kernel arguments by using bootc install configurations

You can use the bootc install command with the --karg option to inject kernel arguments during installation time in the following ways:

Use the kernel arguments on Day 2 operations, by adding the arguments and applying them on a switch, upgrade, or edit.

Prerequisites

Procedure

Create files within /usr/lib/bootc/kargs.d with kernel arguments.

$ sudo tee /usr/lib/bootc/kargs.d/console.kargs << EOF
console=tty0 console=ttyS0,115200n8
EOF

Fetch the container image to get the OSTree commit.

$ podman pull quay.io/<your_org>/<your_bootc_image>:latest

Use the OSTree commit to return the file tree.

# bootc install to-filesystem --karg=root=<UUID>=<uuid of /mnt> --imgref $self /mnt

Navigate to the /usr/lib/bootc/kargs.d kernel arguments directory.
```
cd /usr/lib/bootc/kargs.d
```

Read each file within the kernel arguments directory.

$ find /usr/lib/bootc/kargs.d -name ".kargs" -exec cat {} \;*

Push the contents of each kargs file into a file containing all the needed kargs.
```
$ CONSOLIDATED_KARGS="/tmp/all-kargs.txt"
```
Pass the kargs to the stage() function.
```
$ bootc kargs --append="$KARGS_STRING"
```

Apply the kernel arguments to switch, upgrade, or edit during operations.

$ bootc switch --transport=registry quay.io/<your_org>/<your_bootc_image>:latest