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Enabling autologin and setting a custom hostname
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Make sure that you have completed the steps described in the xref:tutorial-setup.adoc[initial setup page] before starting this tutorial.
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Provisioning Fedora CoreOS
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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].
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Set the system hostname by dropping a file at `/etc/hostname`,
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Raise kernel console logging level to hide audit messages from the console.
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Booting Fedora CoreOS
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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.
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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.
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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:
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[ OK ] Started rpm-ostree System Management Daemon.
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Fedora CoreOS 32.20200715.3.0
Kernel 5.7.8-200.fc32.x86_64 on an x86_64 (ttyS0)
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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)
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[core@tutorial ~]$
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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:
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[core@tutorial ~]$ systemctl cat serial-getty@ttyS0.service
# /usr/lib/systemd/system/serial-getty@.service
...
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# /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 $TERM
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We can also check that the hostname has correctly been set:
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[core@tutorial ~]$ 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
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Exploring Fedora CoreOS internals
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