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Before booting FCOS, you must have an Ignition configuration file. If you do not have one, see xref:producing-ign.adoc[Producing an Ignition File].
If you're booting from PXE or iPXE, you must host the Ignition config on a reachable HTTP(S) or TFTP server. Booting the live PXE image requires at least 2 GiB of RAM with the `coreos.live.rootfs_url` kernel argument, and 4 GiB otherwise.
Booting via ISO
The live ISO image can be booted from a physical DVD disc, from a USB stick, or from a virtual CD drive via lights-out management (LOM) firmware.
To boot from the ISO image, follow these steps:
Download the ISO image:
podman run --security-opt label=disable --pull=always --rm -v .:/data -w /data \
quay.io/coreos/coreos-installer:release download -f iso
Use `coreos-installer iso customize` to customize the ISO for your needs. In this example we assume an Ignition config exists in a file `config.ign`. We also add the optional `coreos.liveiso.fromram` kernel argument to the live boot.
The `coreos.liveiso.fromram` is optional and is used in cases where you want to have no references to the booted media (ISO) once the system is up and running. This enables use cases like removing the media after boot or rewriting the disk the booted media is on, but does require more memory.
KERNEL_ARG='--live-karg-append=coreos.liveiso.fromram'
IGNITION_ARG='--live-ignition=./config.ign'
podman run --security-opt label=disable --pull=always --rm -v .:/data -w /data \
quay.io/coreos/coreos-installer:release iso customize $KERNEL_ARG $IGNITION_ARG \
-o customized.iso fedora-coreos-{stable-version}-live.x86_64.iso
Burn the ISO to disk. On Linux and macOS, you can use `dd`. On Windows, you can use https://rufus.ie/[Rufus] in "DD Image" mode.
Boot it on the target system.
Booting via PXE
To boot from PXE, follow these steps:
Download an FCOS PXE kernel, initramfs, and rootfs image:
podman run --security-opt label=disable --pull=always --rm -v .:/data -w /data \
quay.io/coreos/coreos-installer:release download -f pxe
Follow this example `pxelinux.cfg` for booting the installer images with PXELINUX and running Ignition:
DEFAULT pxeboot
TIMEOUT 20
PROMPT 0
LABEL pxeboot
KERNEL fedora-coreos-{stable-version}-live-kernel-x86_64
APPEND initrd=fedora-coreos-{stable-version}-live-initramfs.x86_64.img,fedora-coreos-{stable-version}-live-rootfs.x86_64.img ignition.firstboot ignition.platform.id=metal ignition.config.url=http://192.168.1.101/config.ign
IPAPPEND 2
Booting via iPXE
An iPXE-capable machine needs to be provided with a relevant Boot Script to fetch and load FCOS artifacts.
The example below shows how to load those directly from Fedora infrastructure. For performance and reliability reasons it is recommended to mirror them on the local infrastructure, and then tweak the `BASEURL` as needed.
#!ipxe
set STREAM stable
set VERSION {stable-version}
set CONFIGURL https://example.com/config.ign
set BASEURL https://builds.coreos.fedoraproject.org/prod/streams/$\{STREAM}/builds/$\{VERSION}/x86_64
kernel $\{BASEURL}/fedora-coreos-$\{VERSION}-live-kernel-x86_64 initrd=main coreos.live.rootfs_url=$\{BASEURL}/fedora-coreos-$\{VERSION}-live-rootfs.x86_64.img ignition.firstboot ignition.platform.id=metal ignition.config.url=$\{CONFIGURL}
initrd --name main $\{BASEURL}/fedora-coreos-$\{VERSION}-live-initramfs.x86_64.img
boot
Using persistent state
By default, the Fedora CoreOS live environment does not store any state on disk, and is reprovisioned from scratch on every boot. However, you may choose to store some persistent state (such as container images) in a filesystem that persists across reboots. For example, here's a Butane config that configures a persistent `/var`:
variant: fcos
version: 1.1.0
storage:
disks:
- device: /dev/sda
wipe_table: true
partitions:
- label: var
filesystems:
- device: /dev/disk/by-partlabel/var
label: var
format: xfs
wipe_filesystem: false
path: /var
with_mount_unit: true
When booting a live environment, the Ignition config runs on every boot, so it should avoid wiping LUKS volumes and filesystems that you want to reuse. Instead, configure such structures so that they're created on the first boot and preserved on subsequent boots.
In particular, note the following guidelines:

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9835014 String information

Source string description
type: delimited block -
Flags
no-wrap, placeholders:r"`[\w.\/\-_=@&*:$●+~()\] ]*`", read-only
Source string location
./pages/live-booting.adoc:53
String age
2 years ago
Last updated
a year ago
Source string age
2 years ago
Translation file
pot/master/pages/live-booting.pot, string 20