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Enabling autologin and setting a custom hostname
Make sure that you have completed the steps described in the xref:tutorial-setup.adoc[initial setup page] before starting this tutorial.
Provisioning Fedora CoreOS
Fedora CoreOS does not have a separate install disk. Instead, every instance starts from a generic disk image which is customized on first boot via https://github.com/coreos/ignition[Ignition].
Set the system hostname by dropping a file at `/etc/hostname`,
Raise kernel console logging level to hide audit messages from the console.
Booting Fedora CoreOS
Now that we have an Ignition config, we can boot a virtual machine with it. This tutorial uses the QEMU image with `libvirt`, but you should be able to use the same Ignition config on all the platforms supported by Fedora CoreOS.
We use the `backing_store` option to `virt-install --disk` to quickly create a new disk image and avoid writing to the original image we have downloaded. This new disk image can be easily thrown away.
Once the machine is booted up you should see a few prompts and then you should be automatically logged in and presented with a bash shell:
[ OK ] Started rpm-ostree System Management Daemon.
Fedora CoreOS 32.20200715.3.0
Kernel 5.7.8-200.fc32.x86_64 on an x86_64 (ttyS0)
SSH host key: SHA256:XlbayjbgDKNoAAHQxsEL5Q7BdwLxxWSw4NXN9SALLmo (ED25519)
SSH host key: SHA256:3sx5jseteO4BvdOMWIi0J4koQL015mLonnD0UPTtnZk (ECDSA)
SSH host key: SHA256:K0fn5/TMJOoMs7Fu7RRkE7IBEf2t8OYCfVaVc+GJWGs (RSA)
ens2: 192.168.122.127 fe80::5054:ff:feb9:3d97
Ignition: user provided config was applied
No ssh authorized keys provided by Ignition or Afterburn
tutorial login: core (automatic login)
[core@tutorial ~]$
Let's verify that our configuration has been correctly applied. As we were automatically logged in to the terminal, we can safely assume that the systemd dropin has been created:
[core@tutorial ~]$ systemctl cat serial-getty@ttyS0.service
# /usr/lib/systemd/system/serial-getty@.service
...
# /etc/systemd/system/serial-getty@ttyS0.service.d/autologin-core.conf
[Service]
# Override Execstart in main unit
ExecStart=
# Add new Execstart with `-` prefix to ignore failure`
ExecStart=-/usr/sbin/agetty --autologin core --noclear %I $TERM
We can also check that the hostname has correctly been set:
[core@tutorial ~]$ cat /etc/hostname
tutorial
[core@tutorial ~]$ hostnamectl
Static hostname: tutorial
Icon name: computer-vm
Chassis: vm
Machine ID: d06466128a1c4a6ab255d9581748755c
Boot ID: 2a19abb9681e442cb1e10271350bfff3
Virtualization: kvm
Operating System: Fedora CoreOS 32.20200715.3.0
CPE OS Name: cpe:/o:fedoraproject:fedora:32
Kernel: Linux 5.7.8-200.fc32.x86_64
Architecture: x86-64
Exploring Fedora CoreOS internals