ansible/roles/isc_dhcp_server/templates/dhcp/dhcp-failover.conf.j2

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failover peer "dhcp-failover" {
{% if inventory_hostname == dhcp_failover.primary_host %}
primary;
# MCLT = Maximum Client Lead Time.
# Must be specified on the primary, forbidden on the secondary.
mclt 3600;
# Address or DNS name on which this node listens for connections
# from its failover peer.
address {{ dhcp_failover.primary_host }};
peer address {{ dhcp_failover.secondary_host }};
# Load balancing.
split 128;
{% endif %}
{% if inventory_hostname == dhcp_failover.secondary_host %}
secondary;
# Address and peer address are reversed on the secondary node.
address {{ dhcp_failover.secondary_host }};
peer address {{ dhcp_failover.primary_host }};
{% endif %}
# The following options can be shared between primary and
# secondary failover peers.
port 647;
peer port 647;
max-response-delay 30;
max-unacked-updates 10;
load balance max seconds 3;
}