Control

Leases

Leases are stored in memfile, by default. But you can also have them written to a CSV file:

 "lease-database": {
     "type": "memfile", // write leases to memfile...
     "persist": true,
     "name": "/tmp/kea-leases4.csv", // ...but also write them to csv
     "lfc-interval": 3600,
     "max-row-errors": 100
 },

MySQL

To use host reservations from MySQL, you need to add the "hosts-database" section to the "Dhcp4" section of the config file, like this:

 "hosts-database": {
     "type": "mysql",
     "name": "kea_db",
     "user": "kea-user",
     "password": "super-secret-password",
     "host": "localhost",
     "port": 3306
 },

Subnet-Ids need to be defined in your subnet declarations, too.

You can use both the hosts database and the configuration file for host reservations at the same time.

IPv4 Reservations

Insert Statement Example:

 SELECT host_id,dhcp_identifier,dhcp4_subnet_id,ipv4_address,hostname FROM hosts;
 
 START TRANSACTION;
 SET @ipv4_reservation='10.1.70.11';
 SET @hostname = 'windows-pc';
 SET @identifier_type='hw-address';
 SET @identifier_value='be:ef:be:ef:be:ef';
 SET @dhcp4_subnet_id=70;
 
 INSERT INTO hosts (dhcp_identifier,
                    dhcp_identifier_type,
                    dhcp4_subnet_id,
                    ipv4_address,
                    hostname)
 VALUES (UNHEX(REPLACE(@identifier_value, ':', )),
 	(SELECT type FROM host_identifier_type WHERE name=@identifier_type),
         @dhcp4_subnet_id,
         INET_ATON(@ipv4_reservation),
         @hostname);
 
 COMMIT;

Sync db Between Two Hosts

Manual Dump of Host Reservations

 mysqldump kea_db -u kea-user -p --tables hosts > kea-hosts.sql

Crontab for use on Standby peers

 */5 * * * * mysqldump -h net1.lambnet.us -u net2 -p<password> --single-transaction kea_db hosts | mysql -u net2 -p<password> kea_db

...

MySQL Performance Tuning

Configure in /etc/mysql/my.cnf:

[mysqld]
innodb_flush_log_at_trx_commit=2

Kea-Shell

Commands

[ { "arguments": [ "build-report", "config-backend-pull", "config-get", "config-reload", "config-set", "config-test", "config-write", "dhcp-disable", "dhcp-enable", "ha-continue", "ha-heartbeat", "ha-maintenance-cancel", "ha-maintenance-notify", "ha-maintenance-start", "ha-reset", "ha-scopes", "ha-sync", "ha-sync-complete-notify", "lease4-add", "lease4-del", "lease4-get", "lease4-get-all", "lease4-get-by-client-id", "lease4-get-by-hostname", "lease4-get-by-hw-address", "lease4-get-page", "lease4-resend-ddns", "lease4-update", "lease4-wipe", "lease6-add", "lease6-bulk-apply", "lease6-del", "lease6-get", "lease6-get-all", "lease6-get-by-duid", "lease6-get-by-hostname", "lease6-get-page", "lease6-resend-ddns", "lease6-update", "lease6-wipe", "leases-reclaim", "libreload", "list-commands", "server-tag-get", "shutdown", "statistic-get", "statistic-get-all", "statistic-remove", "statistic-remove-all", "statistic-reset", "statistic-reset-all", "statistic-sample-age-set", "statistic-sample-age-set-all", "statistic-sample-count-set", "statistic-sample-count-set-all", "status-get", "version-get" ], "result": 0 } ]

Get Status

 kea-shell --host 10.144.30.8 --service dhcp4 status-get

Links

ISC-Kea: https://kea.readthedocs.io/en/latest/arm/config.html
Stork: https://stork.readthedocs.io/en/v1.8.0/; https://gitlab.isc.org/isc-projects/stork/-/wikis/Screenshots

Kea DHCP

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