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fix: reduce hosts plugin refresh interval #8620

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fix: reduce hosts plugin refresh interval #8620

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baf6c08
Reduce hosts plugin refresh interval
Jun 1, 2026
b3d5d92
Address hosts refresh timer feedback
Jun 2, 2026
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14 changes: 8 additions & 6 deletions parts/linux/cloud-init/artifacts/aks-localdns-hosts-setup.timer
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Original file line number Diff line number Diff line change
Expand Up @@ -4,13 +4,15 @@ Description=Run AKS LocalDNS hosts setup periodically
[Timer]
# Run immediately on boot
OnBootSec=0
# Refresh every 15 minutes. AKS critical FQDN IPs can change due to load balancer
# rotation, Traffic Manager failover, or regional DNS updates. 15 minutes balances
# freshness against unnecessary DNS traffic — stale IPs would cause the hosts plugin
# to serve unreachable addresses until the next refresh.
OnUnitActiveSec=15min
# Refresh 10 seconds after each run completes. AKS critical FQDN IPs can change
# due to load balancer rotation, Traffic Manager failover, or regional DNS updates.
# Frequent refreshes keep stale IPs from causing the hosts plugin to serve
Comment on lines 5 to +9
# unreachable addresses for long.
OnUnitInactiveSec=10s
# De-synchronize nodes so refreshes do not all hit DNS at the same time.
RandomizedDelaySec=5s
# Timer accuracy (how much systemd can delay)
AccuracySec=1min
AccuracySec=1s

[Install]
WantedBy=timers.target
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