[lvs-users] ldirectord + mysql woes
malcolm at loadbalancer.org
Mon Jun 29 09:04:11 BST 2015
I think you are just looking for the fallback functionality.
i.e. if my one server dies then use the fallback server.
> real=172.16.31.103:3306 gate 1 # mysql-1
> fallback=172.16.31.102:3306 gate
On 27 June 2015 at 20:02, <support at remsnet.de> wrote:
> Hello Tom,
> remove any sql real node weight's and use wrr scheduler , see below.
> I had used sutch ldirectord +mysql setup some years ago ....
> see old howto : https://www.howtoforge.com/loadbalanced_mysql_cluster_debian_p6
> ...stopped using it with heartbeat3 due funtionality on my systems replaced by keepalived due quite faster IP handover..
> "section 6.3 Configure ldirectord sample configuration file for ldirectord, on the load balancers:
> "loadb1.example.com" / "loadb2.example.com":
> vi /etc/ha.d/ldirectord.cf
> # Global Directives
> virtual = 192.168.0.105:3306
> service = mysql
> real = 192.168.0.101:3306 gate
> real = 192.168.0.102:3306 gate
> checktype = negotiate
> login = "ldirector"
> passwd = "ldirectorpassword"
> database = "ldirectordb"
> request = "SELECT * FROM connectioncheck"
> scheduler = wrr
> Please fill in the correct virtual IP address (192.168.0.105) and the correct IP addresses of your MySQL cluster nodes (192.168.0.101 and 192.168.0.102).
> 3306 is the port that MySQL runs on by default. We also specify a MySQL user (ldirector) and password (ldirectorpassword), a database (ldirectordb) and an SQL query.
> ldirectord uses this information to make test requests to the MySQL cluster nodes to check if they are still available.
> We are going to create the ldirector database with the ldirector user in the next step."
> besides of that..
> Today i am use keepalived for that Mysql N+3 sized ndb cluster with realtime storange sync and + one offside clone node equal like this : http://www.databaseskill.com/1396079/
> I suggest you to install & setup an Galea-Mariadb mysql cluster + keepalived as an 5 node concept, 3 sql/storange nodes and 2 for the loadbalancers.
> Google has a lot of howtow's for keepalived...
> Hope this helps.
> Mit freundlichen Grüßen / Best Regards
> Horst Venzke ; PGP NET : 1024G/082F2E6D ; http://www.remsnet.de - 1995 - 2015 - 20 Jahre Linux/Unix Support.
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>> Gesendet: Montag, 22. Juni 2015 um 12:34 Uhr
>> Von: "Tom Hendrikx" <tom at whyscream.net>
>> An: lvs-users at linuxvirtualserver.org
>> Betreff: [lvs-users] ldirectord + mysql woes
>> I've been trying to get mysql failover working using ldirectord. The
>> general idea is to have 2 mysql instances running in master-master setup
>> (works), then have a ldirectord in front of that sending all queries to
>> server mysql-1 (works), and have it send the queries to the other mysql
>> server (mysql-2) when server mysql-1 goes down (does not work).
>> I've tried several options in ldirectord config, but no luck. Current
>> config is:
>> real=172.16.31.103:3306 gate 65535 # mysql-1
>> real=172.16.31.102:3306 gate 1 # mysql-2
>> request="SELECT COUNT(1) from mytable"
>> When I stop mysql at mysql-1, the queries all fail, they don't seem to
>> be sent to mysql-2.
>> When I switch the weights in the real= lines, all traffic goes to
>> mysql-2 (so mysql-2 + ldirectord setup seems to be functional), but when
>> I take down mysql on server mysql-2, the traffic does not go to mysql-1
>> and queries fail again.
>> I also tried to configure one server as real, and the other as fallback,
>> but this does not work either. ldirectord documentation is not really
>> clear on this, but it seems that the fallback directive is explicitly
>> deviced for returning http traffic?
>> Can somebody shed any light on how to get this working? Or how to debug
>> why the queries are failing (when the setup is deemed correct)?
>> Kind regards,
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