Whit, Here is my conf file : # # Location of the ucarp pid file UCARP_PIDFILE=/var/run/ucarp0.pid
# Define if this host is the prefered MASTER ( this aadd or remove the -P option) UCARP_MASTER="yes" # # ucarp base, Interval monitoring time #lower number will be perfered master # set to same to have master stay alive as long as possible UCARP_BASE=1 #Priority [0-255] #lower number will be perfered master ADVSKEW=0 # # Interface for Ipaddress INTERFACE=bond0:0 # # Instance id # any number from 1 to 255 # Master and Backup need to be the same INSTANCE_ID=42 # # Password so servers can trust who they are talking to PASSWORD=glusterfs # # The Application Address that will failover VIRTUAL_ADDRESS=10.68.217.3 VIRTUAL_BROADCAST=10.68.217.255 VIRTUAL_NETMASK=255.255.255.0 # #Script for configuring interface UPSCRIPT=/etc/ucarp/script/vip-up.sh DOWNSCRIPT=/etc/ucarp/script/vip-down.sh # The Maintanence Address of the local machine SOURCE_ADDRESS=10.68.217.85 Cmd on master : /usr/sbin/ucarp -z -B -P -b 1 -i bond0:0 -v 42 -p glusterfs -k 0 -a 10.68.217.3 -s 10.68.217.85 --upscript=/etc/ucarp/script/vip-up.sh --downscript=/etc/ucarp/script/vip-down.sh Cmd on slave : usr/sbin/ucarp -z -B -M -b 1 -i bond0:0 \ -v 42 -p glusterfs -k 50 -a 10.68.217.3 -s 10.68.217.86 --upscript=/etc/ucarp/script/vip-up.sh --downscript=/etc/ucarp/script/vip-down.sh To me, to have a prefered master is necessary because I'm using RR DNS and I want to do a kind of "active/active" failover.I'll explain the whole idea : SERVER 1<---------------> SERVER 2 VIP1 VIP2 When I access the URL glusterfs.preprod.inetpsa.com, RRDNS gives me one of the VIP(load balancing). The main problem here is if I use only RRDNS, if a server goes down the client currently binded on this server will fail to. So to avoid that I need a VIP failover. By this way, If a server goes down, all the client on this server will be binded on the other one. Because I want loadbalacing, I need a prefered master, so by default need that VIP 1 stay on server 1 and VIP 2 stay on server 2. Currently I trying to make it works with one VIP only. Anthony > Date: Thu, 8 Sep 2011 09:32:59 -0400 > From: [email protected] > To: [email protected] > CC: [email protected] > Subject: Re: [Gluster-users] UCARP with NFS > > On Thu, Sep 08, 2011 at 01:02:41PM +0000, anthony garnier wrote: > > > I got a client mounted on the VIP, when the Master fall, the client switch > > automaticaly on the Slave with almost no delay, it works like a charm. But > > when > > the Master come back up, the mount point on the client freeze. > > I've done a monitoring with tcpdump, when the master came up, the client > > send > > paquets on the master but the master seems to not establish the TCP > > connection. > > Anthony, > > Your UCARP command line choices and scripts would be worth looking at here. > There are different UCARP behavior options for when the master comes back > up. If the initial failover works fine, it may be that you'll have better > results if you don't have a preferred master. That is, you can either have > UCARP set so that the slave relinquishes the IP back to the master when the > master comes back up, or you can have UCARP set so that the slave becomes > the new master, until such time as the new master goes down, in which case > the former master becomes master again. > > If you're doing it the first way, there may be a brief overlap, where both > systems claim the VIP. That may be where your mount is failing. By doing it > the second way, where the VIP is held by whichever system has it until that > system actually goes down, there's no overlap. There shouldn't be a reason, > in the Gluster context, to care which system is master, is there? > > Whit
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