c12s-kubespray/docs/fcos.md

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# Fedora CoreOS
Tested with stable version 31.20200223.3.0.
Because package installation with `rpm-ostree` requires a reboot, playbook may fail while bootstrap.
Restart playbook again.
## Containers
Tested with
- docker
- crio
### docker
OS base packages contains docker.
### cri-o
To use `cri-o` disable docker service with ignition:
```yaml
#workaround, see https://github.com/coreos/fedora-coreos-tracker/issues/229
systemd:
units:
- name: docker.service
enabled: false
contents: |
[Unit]
Description=disable docker
[Service]
[Install]
WantedBy=multi-user.target
```
## Network
### calico
To use calico create sysctl file with ignition:
```yaml
files:
- path: /etc/sysctl.d/reverse-path-filter.conf
contents:
inline: |
net.ipv4.conf.all.rp_filter=1
```
## libvirt setup
### Prepare
Prepare ignition and serve via http (a.e. python -m http.server )
```json
{
"ignition": {
"version": "3.0.0"
},
"passwd": {
"users": [
{
"name": "ansibleUser",
"sshAuthorizedKeys": [
"ssh-rsa ..publickey.."
],
"groups": [ "wheel" ]
}
]
}
}
```
### create guest
```shell script
fcos_version=31.20200223.3.0
kernel=https://builds.coreos.fedoraproject.org/prod/streams/stable/builds/${fcos_version}/x86_64/fedora-coreos-${fcos_version}-live-kernel-x86_64
initrd=https://builds.coreos.fedoraproject.org/prod/streams/stable/builds/${fcos_version}/x86_64/fedora-coreos-${fcos_version}-live-initramfs.x86_64.img
ignition_url=http://mywebserver/fcos.ign
kernel_args="ip=dhcp rd.neednet=1 console=tty0 coreos.liveiso=/ console=ttyS0 coreos.inst.install_dev=/dev/sda coreos.inst.stream=stable coreos.inst.ignition_url=${ignition_url}"
sudo virt-install --name ${machine_name} --ram 4048 --graphics=none --vcpus 2 --disk size=20 \
--network bridge=virbr0 \
--install kernel=${kernel},initrd=${initrd},kernel_args_overwrite=yes,kernel_args="${kernel_args}"
```