Comments on: High availability for MySQL on Amazon EC2 â€“ Part 2 – Setting up the initial instances

By: Dimitri

Dimitri — Tue, 12 Oct 2010 03:51:37 +0000

ap1285,

Run the crm status command as root.

By: ap1285

ap1285 — Sat, 09 Oct 2010 10:05:33 +0000

Dear Yves Trudeau,

Thank You very much for the article.

I’m trying to setup heartbeat and pacemaker on two Ubuntu 10.04 servers. I followed your setups. I can see in the output of “tcpdump -i eth0 port 694″ that msgs sent and received. But “crm status” give me error “Connection to cluster failed: connection failed”.

Any Idea, I’m quite new to heartbeat and pacemaker

Thanks in advance

By: Florian Haas

Florian Haas — Mon, 12 Jul 2010 16:53:16 +0000

Running heartbeat with non-identical ha.cf files is a bad idea. You can just use identical ha.cf files with two ucast lines in there. Any heartbeat node will happily ignore any ucast line that matches a locally configured IP address. Check out the ucast entry in the ha.cf man page (http://www.linux-ha.org/doc/re-hacf.html).

By: Morgan

Morgan — Wed, 30 Jun 2010 13:50:05 +0000

It’s important to keep in mind that EC2 network performance degrades significantly if you attempt to cross availability zones (e.g. going from us-east-1c to us-east-1b). You’ve chosen correctly to put the HA servers in the same zone. This goes for any internal communication that might take place.

By: Yves Trudeau

Yves Trudeau — Tue, 29 Jun 2010 07:00:01 +0000

Luke,

which version of the tool are you using and could you sent a sample output of ec2-describe-instance

By: Luke

Luke — Tue, 29 Jun 2010 07:00:01 +0000

Cleared the print line statement. now when running the line is just printed in a loop. It seems that for some reason the ec2-describe-instances isn’t being handled by the perl script, unless im mistaken.

By: Yves Trudeau

Yves Trudeau — Tue, 29 Jun 2010 07:00:01 +0000

Luke,
remove the “#” in #print “Processing: $_n”; and look at the output. maybe we don’t use the same version of the tool and that cause the regexp to fail.

By: john

john — Tue, 29 Jun 2010 07:00:01 +0000

You can set the hostname and have it stick after reboot on ec2.

vi /etc/rc.local
then add a line at the bottom
hostname hamysql

By: Luke

Luke — Tue, 29 Jun 2010 07:00:01 +0000

Great article! really been informative.

However i am having a problem with the filtre_instances.pl script, whenever it is run the command line hangs then does nothing. any ideas? as you know this script is important in order to get the killing script working correctly.

failing command
ec2-describe-instances -K /usr/local/bin/pk-******.pem -C /usr/local/bin/cert-******.pem | /usr/local/bin/filtre_instance.pl