[Kea-users] Kea 1.5 with MySQL Cluster

Fernando Ruza Rodriguez fernandor at sescam.jccm.es
Mon Apr 29 10:41:57 UTC 2019


Hi again!

I've read in the kea 1.5.0 release notes:
https://ftp.isc.org/isc/kea/1.5.0/Kea150ReleaseNotes.txt the following:


**Configuration Backend design** - The Configuration Backend feature is 
now planned for Kea 1.6.0. It will provide the ability to use a database as 
a source of configuration information for the Kea DHCP servers. Even though 
the Configuration Backend is not functional in the Kea 1.5.0 release, the 
design for this feature was created and some basic elements implementing 
this design are included in the current version. The most prominent change 
is the update of the MySQL schema to include new tables, constraints and 
indexes to be used by the Configuration Backend feature once it is 
implemented. These elements are currently unused, but they will be created 
in the existing database instances once the MySQL database is upgraded to 
the version supported by Kea 1.5.0 release. The design of the Configuration 
Backend is available at 
https://gitlab.isc.org/isc-projects/kea/wikis/designs/configuration-in-db-des
ign.


And I see in the "Kea Configuration Backend Design:
https://gitlab.isc.org/isc-projects/kea/wikis/designs/configuration-in-db-design" that the both tables what I'm having problems with MySQL NDB cluster are for this Configuration Backend feature that it's not used by kea version 1.5.0 yet. So, Could I obviate these tables and keep engine to innodb in them and still use kea version 1.5.0 in MySQL NDB cluster ?? What do you think ??.

Thanks for any reply.

Regards, Fernando.


-----Mensaje original-----
De: Fernando Ruza Rodriguez <fernandor at sescam.jccm.es>
Para: Kea-users at lists.isc.org
Asunto: Re: [Kea-users] Kea 1.6 with MySQL Cluster
Fecha: Mon, 29 Apr 2019 11:53:53 +0200

Sorry, I said kea version 1.6 and I wanted to say: kea version 1.5. It
is a restriction regarding foreign keys and on update cascade:

https://dev.mysql.com/doc/mysql-cluster-excerpt/5.7/en/mysql-cluster-limitations-syntax.html

Restrictions on foreign keys.  Support for foreign key constraints in
NDB 7.5 is comparable to that provided by InnoDB, subject to the
following restrictions:


      * ON UPDATE CASCADE is not supported when the reference is to the
        parent table's primary key.
        
        This is because an update of a primary key is implemented as a
        delete of the old row (containing the old primary key) plus an
        insert of the new row (with a new primary key). This is not
        visible to the NDB kernel, which views these two rows as being
        the same, and thus has no way of knowing that this update should
        be cascaded.
        

I have downloaded and installed kea version 1.4.0-P1 and replaced in
mysql script the engine from INNODB to NDBCLUSTER and now the database
is created correctly.

Thanks and regards,

Fernando. 


-----Mensaje original-----
De: Fernando Ruza Rodriguez <fernandor at sescam.jccm.es>
Para: Kea-users at lists.isc.org
Asunto: [Kea-users] Kea 1.6 with MySQL Cluster
Fecha: Fri, 26 Apr 2019 14:55:19 +0200

Hi, I'm trying to setup kea 1.6 with MySQL NDB Cluster backend. Has
someone experienced with them?

I have changed the "ENGINE" in all create tables statements with
ENGINE=NDBCLUSTER in the script dhcpdb_create.mysql however when I run
it I get the following errors, I think, when created the tables
keadhcp.dhcp4_pool and keadhcp.dhcp6_pool for the foreign keys they
have:

...

ERROR 1215 (HY000): Cannot add foreign key constraint
Query OK, 0 rows affected (0,46 sec)

Query OK, 0 rows affected (1,50 sec)
Records: 0  Duplicates: 0  Warnings: 0

Query OK, 0 rows affected (1,77 sec)
Records: 0  Duplicates: 0  Warnings: 0

Query OK, 0 rows affected (0,48 sec)

ERROR 1146 (42S02): Table 'keadhcp.dhcp4_pool' doesn't exist
Query OK, 0 rows affected (0,48 sec)

...

ERROR 1215 (HY000): Cannot add foreign key constraint
ERROR 1215 (HY000): Cannot add foreign key constraint
Query OK, 0 rows affected (1,65 sec)
Records: 0  Duplicates: 0  Warnings: 0

Query OK, 0 rows affected (1,36 sec)
Records: 0  Duplicates: 0  Warnings: 0

Query OK, 0 rows affected (0,57 sec)

ERROR 1146 (42S02): Table 'keadhcp.dhcp6_pool' doesn't exist
Query OK, 1 row affected (0,03 sec)
Rows matched: 1  Changed: 1  Warnings: 0


Thanks in advanced for any help.

Regards, Fernando.


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