2021-12-09 23:25:44 +00:00
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#!/bin/sh -e
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#
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# ip-dhcp-host.sh - add or remove a mac address --> ipv4 mapping
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action="$1"
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network_name="$2"
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mac_address="$3"
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ipv4_address="$4"
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[ "$action" != 'add' ] && [ "$action" != 'delete' ] && printf 'you must set $action to either add or delete (1st arg)\n' && exit 1
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[ "$network_name" = '' ] && printf 'you must set $network_name (2nd arg)\n' && exit 1
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[ "$mac_address" = '' ] && printf 'you must set $mac_address (3rd arg)\n' && exit 1
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[ "$ipv4_address" = '' ] && printf 'you must set $ipv4_address (4th arg)\n' && exit 1
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2021-12-09 23:34:39 +00:00
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# for some reason libvirt appears to remember every dhcp lease even after it has expired.
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# adding a new ip-dhcp-host will fail if there already is one with the same ip address.
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# so we will try to delete any that already exist with that IP address just in case!
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if [ "$action" == 'add' ]; then
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printf "trying to delete any existing (probably expired) dhcp associations for $ipv4_address..."
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virsh net-update "$network_name" delete ip-dhcp-host "<host ip='$ipv4_address' />" --live --config || true
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fi
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printf "adding $mac_address --> $ipv4_address to $network_name"
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2021-12-09 23:25:44 +00:00
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virsh net-update "$network_name" "$action" ip-dhcp-host "<host mac='$mac_address' ip='$ipv4_address' />" --live --config
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