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// This is an example configuration file for the DHCPv4 server in Kea.
// It provides parameters controlling processing of expired leases,
// a.k.a. leases reclamation.
{ "Dhcp4":
{
// Kea is told to listen on eth0 interface only.
"interfaces-config": {
"interfaces": [ "eth0" ]
},
// We need to specify the database used to store leases. As of
// June 2022, three database backends are supported: MySQL,
// PostgreSQL and the in-memory database, Memfile.
// We'll use memfile because it doesn't require any prior set up.
// Note, we're setting the maximum number of row read errors to 100,
// (defaults to 0, meaning unlimited).
"lease-database": {
"type": "memfile",
"lfc-interval": 3600,
"max-row-errors": 100
},
// The following parameters control processing expired leases. Expired
// leases will be reclaimed periodically according to the
// "reclaim-timer-wait-time" parameter. Reclaimed leases will be held in
// the database for 1800s to facilitate lease affinity. After this
// period the leases will be removed. The frequency of removal is
// controlled by the "flush-reclaimed-timer-wait-time" parameter. The
// lease reclamation routine will process at most 500 leases or will
// last for at most 100ms, during a single run. If there are still some
// unreclaimed leases after 10 attempts, a warning message is issued.
// If both "flush-reclaimed-timer-wait-time" and "hold-reclaimed-time" are not
// 0, when the client sends a release message the lease is expired instead of
// being deleted from lease storage.
"expired-leases-processing": {
"reclaim-timer-wait-time": 5,
"hold-reclaimed-time": 1800,
"flush-reclaimed-timer-wait-time": 10,
"max-reclaim-leases": 500,
"max-reclaim-time": 100,
"unwarned-reclaim-cycles": 10
},
// Addresses will be assigned with a lifetime of 4000 seconds.
"valid-lifetime": 4000,
// The following list defines subnets. We have only one subnet
// here. We tell Kea that it is directly available over local interface.
"subnet4": [
{
"pools": [ { "pool": "192.0.2.1 - 192.0.2.200" } ],
"id": 1,
"subnet": "192.0.2.0/24",
"interface": "eth0"
}
],
// The following configures logging. It assumes that messages with at
// least informational level (info, warn, error and fatal) should be
// logged to stdout.
"loggers": [
{
"name": "kea-dhcp4",
"output_options": [
{
"output": "stdout"
}
],
"severity": "INFO"
}
]
}
}
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