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Re: [Linux-cluster] Basic Active Active File Server



Hi All

thanks for all the advice guys, I will run through these tomorrow, (Pearl Jam last night, enough said!)

Jay

On Jun 23, 2010 8:32am, Kit Gerrits <kitgerrits gmail com> wrote:
>
>
> Hey Jay,
>
>
>
> I'm not at work at the moment, but this should get you started:
>
>
>
> 1/ The simplest test is to tell clustering to use broadcast instead of
>
> multicast.
>
> # In a single ESX server, you can use a host-only vSwitch for that.
>
> # Disable multicast by removing the multicast reference from the cluster
>
> configuration and restart the cluster
>
>
>
>
>
> You can check multicast traffic between nodes in 2 ways:
>
> 2/ dumping packets
>
> #relatively simple
>
>
>
> tcpdump -i ip multicast
>
> # I'm not sure (can't test from here), else try:
>
> tcpdump -i ether multicast
>
>
>
> # That should show multicast packets traveling over the interface to and
>
> from the hosts and the multicast IP
>
>
>
>
>
> 3/ ping tests
>
>
>
> # By enabling responses to broadcast pings in both Host O/S'es and pinging
>
> them on their multicast address:
>
> # http://kerneltrap.org/node/16225
>
> echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
>
>
>
> # find out the multicast IP of the cluster
>
> cman_tool status
>
> # Ex: Multicast addresses: 239.192.12.239
>
>
>
> # ping the multicast IP from each host
>
> ping -L 239.192.12.239
>
> #You should see ping replies.
>
>
>
>
>
> About DNS:
>
> Clustering will use the IP that the hostname resolves to.
>
> The interface that IP resolves to will be used for multicast traffic.
>
> If you need to use another interface, give the IP on that interface its own
>
> hostname and put that in the cluster config.
>
>
>
> About 224.0.0.1
>
> I'm not sure, either.
>
> I will try It out at the office.
>
>
>
>
>
> Footnote:
>
> http://sourceware.org/cluster/doc/usage.txt
>
> Advanced Network Configuration
>
> ------------------------------
>
>
>
> * UDP Port
>
>
>
> CMAN uses UDP port 6809 by default.  A different port number can be used by:
>
>
>
>
>
>
>
>
>
>
>
> * Multicast
>
>
>
> CMAN can be configured to use multicast instead of broadcast (broadcast is
>
> used by default if no multicast parameters are given.)  To configure
>
> multicast
>
> add one line under the section and another under the
>
> section:
>
>
>
>
>
>    
>
>
>
>
>
>
>
>    
>
>
>
>
>
> The multicast addresses must match and the address must be usable on the
>
> interface name given for the node.
>
>
>
>
>
>
>
> Regards,
>
>
>
> Kit
>
>
>
> -----Original Message-----
>
> From: Jason Fitzpatrick [mailto:jayfitzpatrick gmail com]
>
> Sent: dinsdag 22 juni 2010 10:40
>
> To: Kit Gerrits
>
> Cc: linux clustering
>
> Subject: Re: [Linux-cluster] Basic Active Active File Server
>
>
>
> Hi Kit..
>
>
>
> Awesome and all as I am when it comes to computers, networking is a serious
>
> weak point ;0)
>
>
>
> How would I go about checking if multicast traffic is making it between the
>
> two nodes, they are now hosted of the same ESX server and therefore only
>
> hitting the virtual switch in the ESX and should not have to traverse our
>
> network at all.
>
>
>
> I will review the ESX switch config and DNS (I have a horrible feeling that
>
> the DNS gremlins are responsible, but am pretty sure that this should not
>
> affect Multicast)
>
>
>
> Also the multicast address that should be used, I am using 244.0.0.1
>
> which I believe is      The All Hosts multicast group that contains all
>
> systems on the same network segment, but am not a 100% sure if this is the
>
> correct setting.
>
>
>
> Thanks again
>
>
>
> Jay
>
>
>
> On 22 June 2010 09:12, Kit Gerrits kitgerrits gmail com> wrote:
>
> >
>
> > Keep in mind that multicast requires a multicast router to handle the
>
> > traffic.
>
> > Mere Layer2 connectivity is not enough.
>
> >
>
> > If broadcast does work, that might be your problem.
>
> >
>
> > Kit
>
> >
>
> > -----Original Message-----
>
> > From: linux-cluster-bounces redhat com
>
> > [mailto:linux-cluster-bounces redhat com] On Behalf Of Jason
>
> > Fitzpatrick
>
> > Sent: maandag 21 juni 2010 18:14
>
> > To: linux clustering
>
> > Subject: Re: [Linux-cluster] Basic Active Active File Server
>
> >
>
> > Hi..
>
> >
>
> > I have tried both multicast and broadcast to no avail, as above I am
>
> > moving the systems to the same ESX to try and rule out the networking
>
> > end of things, I have not tried the tcpdump but was running wireshark
>
> > in an attempt to do the same as you recommended
>
> >
>
> > Jay
>
> >
>
> > On 21 June 2010 16:49, Kaloyan Kovachev kkovachev varna net> wrote:
>
> >> Hi,
>
> >> On Mon, 21 Jun 2010 16:07:34 +0100, Jason Fitzpatrick
>
> >> jayfitzpatrick gmail com> wrote:
>
> >>> Hi all
>
> >>>
>
> >>> I am having no end of trouble getting a basic Active Active Cluster
>
> >>> working. at the moment it is in test / proof of concept and has
>
> >>> manual fencing in place but I cannot for the life of me get the 2
>
> >>> nodes to join to the one cluster (they both report joined in
>
> >>> crm_tool status but only to a local clustered instance if that makes
>
> >>> any
>
> >>> sence)
>
> >>>
>
> >>> I have tried to use luci and system-config-cluster to get this up
>
> >>> and running and have been at it over a week, the network guys swear
>
> >>> that there is nothing blocking multicast traffic between them and
>
> >>> the firewalls have been disabled (they are on the same VLAN but
>
> >>> connected to different switches) servers have been rebuilt and have
>
> >>> RHEL 5.5 installed
>
> >>>
>
> >>
>
> >> your problem is the multicast traffic - check with tcpdump if it is
>
> >> comming to the other server at all (network) and if it is, then
>
> >> doublecheck the firewall.
>
> >> alternatively you may try using broadcast instead of multicast
>
> >>
>
> >>> Shared Storage is being provided by an Active Active DRBD setup
>
> >>> (tested and working)
>
> >>>
>
> >>> I have attached a copy of my cluster.conf
>
> >>>
>
> >>> Thanks in advance
>
> >>>
>
> >>> Jay
>
> >>>
>
> >>> --
>
> >>>
>
> >>> "The only difference between saints and sinners is that every saint
>
> >>> has a past while every sinner has a future. "
>
> >>> - Oscar Wilde
>
> >>
>
> >> --
>
> >> Linux-cluster mailing list
>
> >> Linux-cluster redhat com
>
> >> https://www.redhat.com/mailman/listinfo/linux-cluster
>
> >
>
> >
>
> >
>
> > --
>
> >
>
> > "The only difference between saints and sinners is that every saint
>
> > has a past while every sinner has a future. "
>
> > - Oscar Wilde
>
> >
>
> > --
>
> > Linux-cluster mailing list
>
> > Linux-cluster redhat com
>
> > https://www.redhat.com/mailman/listinfo/linux-cluster
>
> > No virus found in this incoming message.
>
> > Checked by AVG - www.avg.com
>
> > Version: 9.0.829 / Virus Database: 271.1.1/2952 - Release Date:
>
> > 06/20/10 20:36:00
>
> >
>
> >
>
>
>
>
>
>
>
> --
>
>
>
> "The only difference between saints and sinners is that every saint has a
>
> past while every sinner has a future. "
>
> - Oscar Wilde
>
> No virus found in this incoming message.
>
> Checked by AVG - www.avg.com
>
> Version: 9.0.829 / Virus Database: 271.1.1/2954 - Release Date: 06/21/10
>
> 20:36:00
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