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[release-4.5] Bug 1853400: templates: add node-valid-hostname.service for hostname check #1901

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[release-4.5] Bug 1853400: templates: add node-valid-hostname.service for hostname check #1901

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24 changes: 24 additions & 0 deletions templates/common/_base/units/node-valid-hostname.service
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Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
name: node-valid-hostname.service
enabled: true
contents: |
[Unit]
Description=Ensure hostname is not localhost
# Only run when the host has a localhost name.
ConditionHost=|localhost
ConditionHost=|localhost.localdomain
Before=network-online.target

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStartPre=/bin/echo "Node has localhost hostname. Waiting for new hostname."
# Get the short hostname. This is more reliable than a regex.
ExecStartPre=/bin/bash -c 'while [ `hostname -s` == "localhost" ]; do sleep 1; done;'
ExecStart=/bin/sh -c "echo Node changed hostname to `hostname`"
# Wait up to 5min for the node to get a real hostname.
TimeoutSec=300

[Install]
WantedBy=multi-user.target
# Ensure that network-online.target will not complete until the node has a real hostname.
RequiredBy=network-online.target