david.lang at digitalinsight
Dec 1, 2009, 2:20 PM
Post #2 of 3
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On Tue, 1 Dec 2009, Marcus Bointon wrote:
> I'm trying to set up HA on an ubuntu cluster. The docs are fairly comprehensive, but I still can't make sufficient sense out of them or find any sufficiently matching examples.
> My scenario is pretty standard - two nodes running pound and HA managing two floating IPs between the two. I'm using the stock Ubuntu 2.1.4 package with an HA 1.0 style config. The main thing I can't quite figure out is exactly what to do with the floating IPs. As far as I can see, the floating IPs are purely resources to be shared by my nodes and as such are not nodes themselves, and don't need to appear in ha.cf. Having said that, I have use of another HA config done by someone else that lists a floating IP as a node and ucast, and it works fine, which has me confused.
>
> Say that my two nodes are 192.158.1.1 and 192.168.1.2, call them www1 and www2, and my floating IPs are 192.168.1.3 and 192.168.1.4.
>
> So far my ha.cf looks like this:
>
> node www1 www2
I thought you needed a different node line for each server
node www1
node www2
> ucast eth0 192.158.1.1
> ucast eth0 192.158.1.2
> deadtime 5
> deadping 5
> debug 0
>
> and haresources looks like this:
>
> www1 192.158.1.3
> www1 192.158.1.4
unless you have a specific reason to allow the two IP addresses to exist on two
different machines you should put them both in the same line
www1 182.158.1.3 192.158.1.4
> I've added this to my /etc/sysctl.conf, which was apparently necessary to allow the floating IPs to exist:
> net.ipv4.ip_nonlocal_bind=1
this isn't needed to let floating IPs exist, but it is needed to let software
startup that wants to use these IP addresses when the box isn't active.
> Does all that look right? Anything I've missed? Do the floating IPs need to
> appear in ha.cf as ucast lines (like my other setup)? Is my other setup wrong?
other than the nodes above, this looks reasonable.
what I am currently using is
keepalive 2
deadtime 10
udpport 1107
bcast eth0 eth1 eth2 eth3 eth4 eth5 eth6 eth7
node primary
node backup
debugfile /var/log/ha-debug
logfile /var/log/ha-log
auto_failback off
apiauth cl_status gid=haclient
this is using udp broadcase instead of unicast
you may want to add debugfile and logfile options, then if things don't work
look at what those files have to say
David Lang
> Thanks,
>
> Marcus
>
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