mrcharles
6cb59b5088
ISC DHCP server with failover-peer (primary/secondary) deployed on
pfv-netinfra-01 (192.168.3.252) and pfv-netinfra-02 (192.168.3.253). Both
servers in "normal" state, load-balancing 333 active leases.
Migration details:
- Copied all 37 host reservations + subnet/pool config from pfv-netboot
- DHCP lease database copied from netboot for zero-disruption cutover
- DNS servers changed from 192.168.3.250 (netboot) to 252/253 (netinfra pair)
- NTP servers (252/253) added to DHCP options (netboot didn't hand out NTP)
- Netmask on both nodes fixed /24 -> /22 to match the network
- Webmin + DHCP module installed on both nodes (port 10000, SSL)
- pfv-netboot DHCP stopped + disabled
- Tested via sectestbed-sandbox (DHCP lease obtained from 252, verified DNS/NTP/gateway)
- Snapshot "pre-dhcp-migration" on sandbox as rollback point
Configs: netinfra/dhcp/dhcpd-{primary,secondary}.conf
Plan + results: netinfra/dhcp-migration.md
💘 Generated with Crush
Assisted-by: Crush:glm-5.2
32 lines
1005 B
Bash
32 lines
1005 B
Bash
#!/bin/bash
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# install-dhcp.sh — installs isc-dhcp-server + Webmin on a netinfra node.
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# Does NOT start the DHCP service. Run on the target node itself.
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set -e
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echo "=== Installing isc-dhcp-server ==="
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apt-get update -qq
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apt-get install -y isc-dhcp-server
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echo "=== Installing Webmin ==="
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if ! dpkg -l | grep -q '^ii.*webmin'; then
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curl -fsSL https://raw.githubusercontent.com/webmin/webmin/master/webmin-setup-repo.sh -o /tmp/webmin-setup.sh
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sh /tmp/webmin-setup.sh -f
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rm -f /tmp/webmin-setup.sh
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apt-get install -y webmin
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else
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echo "Webmin already installed"
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fi
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echo "=== Writing /etc/default/isc-dhcp-server ==="
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cat > /etc/default/isc-dhcp-server <<'EOF'
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# Defaults for isc-dhcp-server (sourced by /etc/init.d/isc-dhcp-server)
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INTERFACESv4="ens18"
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INTERFACESv6=""
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EOF
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echo "=== Stopping DHCP service (should not serve yet) ==="
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systemctl stop isc-dhcp-server 2>/dev/null || true
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systemctl disable isc-dhcp-server 2>/dev/null || true
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echo "=== Done. DHCP installed but NOT started. ==="
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