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We can now create a Butane config that will include the script and systemd unit file contents by picking up the local `public-ipv4.sh` and `issuegen-public-ipv4.service` files using local file references. The final Butane config, stored in `services.bu`, will be:
variant: fcos
version: {butane-latest-stable-spec}
systemd:
units:
- name: serial-getty@ttyS0.service
dropins:
- name: autologin-core.conf
contents: |
[Service]
# Override Execstart in main unit
ExecStart=
# Add new Execstart with `-` prefix to ignore failure`
ExecStart=-/usr/sbin/agetty --autologin core --noclear %I $TERM
- name: issuegen-public-ipv4.service
enabled: true
contents_local: issuegen-public-ipv4.service
storage:
files:
- path: /etc/hostname
mode: 0644
contents:
inline: |
tutorial
- path: /etc/profile.d/systemd-pager.sh
mode: 0644
contents:
inline: |
# Tell systemd to not use a pager when printing information
export SYSTEMD_PAGER=cat
- path: /usr/local/bin/public-ipv4.sh
mode: 0755
contents:
local: public-ipv4.sh
Check the Butane https://coreos.github.io/butane/examples/[Examples] and https://coreos.github.io/butane/specs/[Configuration specifications] for more details about local file includes.
With the files `public-ipv4.sh`, `issuegen-public-ipv4.service`, and `services.bu` in the current working directory we can now convert to Ignition:
butane --pretty --strict --files-dir=./ services.bu --output services.ign
Testing
Just as before we will use the following to boot the instance:
# Setup the correct SELinux label to allow access to the config
chcon --verbose --type svirt_home_t services.ign
# Start a Fedora CoreOS virtual machine
virt-install --name=fcos --vcpus=2 --ram=2048 --os-variant=fedora-coreos-stable \
--import --network=bridge=virbr0 --graphics=none \
--qemu-commandline="-fw_cfg name=opt/com.coreos/config,file=${PWD}/services.ign" \
--disk=size=20,backing_store=${PWD}/fedora-coreos.qcow2
And view on the console that the `Detected Public IPv4` is shown in the console output right before you are dropped to a login prompt:
Fedora CoreOS 38.20230709.3.0
Kernel 6.3.11-200.fc38.x86_64 on an x86_64 (ttyS0)
SSH host key: SHA256:tYHKk26+NZ/+ZytWLXClGz813PQJDGP/2+AiuZ8fiqk (ECDSA)
SSH host key: SHA256:jJASZec/91zXd4or0uiFsvsfaLC6viLronfxIwQlNCs (ED25519)
SSH host key: SHA256:2XlSZAehEu666fmXeM8d47lpIJd92MBOqgMazT4GsVw (RSA)
enp1s0: 192.168.124.150 fe80::475a:7a10:2302:b670
Ignition: ran on 2023/08/03 16:40:45 UTC (this boot)
Ignition: user-provided config was applied
No SSH authorized keys provided by Ignition or Afterburn
Detected Public IPv4: is 3.252.102.80
tutorial login: core (automatic login)
Fedora CoreOS 38.20230709.3.0
[core@tutorial ~]$
And the service shows it was launched successfully:
[core@tutorial ~]$ systemctl status --full issuegen-public-ipv4.service
● issuegen-public-ipv4.service
Loaded: loaded (/etc/systemd/system/issuegen-public-ipv4.service; enabled; preset: enabled)
Drop-In: /usr/lib/systemd/system/service.d
└─10-timeout-abort.conf
Active: active (exited) since Thu 2023-08-03 16:40:55 UTC; 1min 7s ago
Process: 1423 ExecStart=/usr/local/bin/public-ipv4.sh (code=exited, status=0/SUCCESS)
Process: 1460 ExecStartPost=/usr/bin/touch /var/lib/issuegen-public-ipv4 (code=exited, status=0/SUCCESS)
Main PID: 1423 (code=exited, status=0/SUCCESS)
CPU: 84ms
Aug 03 16:40:55 tutorial systemd[1]: Starting issuegen-public-ipv4.service...
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: % Total % Received % Xferd Average Speed Time Time Time Current
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: Dload Upload Total Spent Left Speed
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: [158B blob data]
Aug 03 16:40:55 tutorial systemd[1]: Finished issuegen-public-ipv4.service.
Cleanup
Now let's take down the instance for the next test. First, disconnect from the serial console by pressing `CTRL` + `]` and then destroy the machine:
virsh destroy fcos
virsh undefine --remove-all-storage fcos
You may now proceed with the xref:tutorial-containers.adoc[next tutorial].

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String updated in the repository
Aug 03 16:40:55 tutorial systemd[1]: Starting issuegen-public-ipv4.service...
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: % Total % Received % Xferd Average Speed Time Time Time Current
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: Dload Upload Total Spent Left Speed
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: [158B blob data]
Aug 03 16:40:55 tutorial systemd[1]: Finished issuegen-public-ipv4.service.
Aug 03 16:40:55 tutorial systemd[1]: Starting issuegen-public-ipv4.service...
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: % Total % Received % Xferd Average Speed Time Time Time Current
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: Dload Upload Total Spent Left Speed
Aug 03 16:40:55 tutorial public-ipv4.sh[1424]: [158B blob data]
Aug 03 16:40:55 tutorial systemd[1]: Finished issuegen-public-ipv4.service.
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14881125 String information

Source string description
type: delimited block -
Flags
no-wrap, placeholders:r"`[\w.\/\-_=@&*:$●+~()\] ]*`", read-only
Source string location
./pages/tutorial-services.adoc:156
String age
a year ago
Last updated
a year ago
Source string age
a year ago
Translation file
pot/master/pages/tutorial-services.pot, string 32