[ClusterLabs] IPaddr2 RA and bonding

Ken Gaillot kgaillot at redhat.com
Thu Aug 10 16:32:56 CEST 2017 

On Thu, 2017-08-10 at 11:02 +0000, Tomer Azran wrote:
> That looks exactly what I needed - it works.
> I had to change the RA since I don't want to give an interface name as a parameter (it might change from server to server and I want to create a cloned resource).
> I changed the RA a little bit to be able to guess the interface name based on a IP address parameter.
> The new RA is published on my github repo: https://github.com/tomerazran/Pacemaker-Resource-Agents/blob/master/ipspeed 

Nice! Feel free to open a PR against the ClusterLabs/pacemaker
repository with your changes. You could make it so the user has to
specify one of iface or ip, or you could have another parameter
iface_from_ip=true/false and put the IP in iface.

> Just to document the solution in case anyone will need it also, I run the following setup:
> 
>  # pcs resource create vip ocf:heartbeat:IPaddr2 ip=192.168.1.3 op monitor interval=30
>  # pcs resource create vip_speed ocf:heartbeat:ipspeed ip=192.168.1.3 name=vip_speed op monitor interval=5s --clone
>  # pcs constraint location vip rule score=-INFINITY vip_speed lt 1 or not_defined vip_speed
> 
> Thank you for the support,
> Tomer.
> 
> 
> -----Original Message-----
> From: Vladislav Bogdanov [mailto:bubble at hoster-ok.com] 
> Sent: Monday, August 7, 2017 9:22 PM
> To: users at clusterlabs.org
> Subject: Re: [ClusterLabs] IPaddr2 RA and bonding
> 
> 07.08.2017 20:39, Tomer Azran wrote:
> > I don't want to use this approach since I don't want to be depend on pinging to other host or couple of hosts.
> > Is there any other solution?
> > I'm thinking of writing a simple script that will take a bond down 
> > using ifdown command when there are no slaves available and put it on 
> > /sbin/ifdown-local
> 
> For the similar purpose I wrote and use this one - https://github.com/ClusterLabs/pacemaker/blob/master/extra/resources/ifspeed
> 
> It sets a node attribute on which other resources may depend via location constraint  - http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/ch08.html#ch-rules
> 
> It is not installed by default, and that should probably be fixed.
> 
> That RA supports bonds (and bridges), and even tries to guess actual resulting bond speed based on a bond type. For load-balancing bonds like LACP (mode 4) one it uses coefficient of 0.8 (iirc) to reflect actual possible load via multiple links.
> 
> >
> >
> > -----Original Message-----
> > From: Ken Gaillot [mailto:kgaillot at redhat.com]
> > Sent: Monday, August 7, 2017 7:14 PM
> > To: Cluster Labs - All topics related to open-source clustering 
> > welcomed <users at clusterlabs.org>
> > Subject: Re: [ClusterLabs] IPaddr2 RA and bonding
> >
> > On Mon, 2017-08-07 at 10:02 +0000, Tomer Azran wrote:
> >> Hello All,
> >>
> >>
> >>
> >> We are using CentOS 7.3 with pacemaker in order to create a cluster.
> >>
> >> Each cluster node ha a bonding interface consists of two nics.
> >>
> >> The cluster has an IPAddr2 resource configured like that:
> >>
> >>
> >>
> >> # pcs resource show cluster_vip
> >>
> >> Resource: cluster_vip (class=ocf provider=heartbeat type=IPaddr2)
> >>
> >>   Attributes: ip=192.168.1.3
> >>
> >>   Operations: start interval=0s timeout=20s (cluster_vip
> >> -start-interval-0s)
> >>
> >>               stop interval=0s timeout=20s (cluster_vip
> >> -stop-interval-0s)
> >>
> >>               monitor interval=30s (cluster_vip 
> >> -monitor-interval-30s)
> >>
> >>
> >>
> >>
> >>
> >> We are running tests and want to simulate a state when the network 
> >> links are down.
> >>
> >> We are pulling both network cables from the server.
> >>
> >>
> >>
> >> The problem is that the resource is not marked as failed, and the 
> >> faulted node keep holding it and does not fail it over to the other 
> >> node.
> >>
> >> I think that the problem is within the bond interface. The bond 
> >> interface is marked as UP on the OS. It even can ping itself:
> >>
> >>
> >>
> >> # ip link show
> >>
> >> 2: eno3: <NO-CARRIER,BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc mq 
> >> master bond1 state DOWN mode DEFAULT qlen 1000
> >>
> >>     link/ether 00:1e:67:f6:5a:8a brd ff:ff:ff:ff:ff:ff
> >>
> >> 3: eno4: <NO-CARRIER,BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc mq 
> >> master bond1 state DOWN mode DEFAULT qlen 1000
> >>
> >>     link/ether 00:1e:67:f6:5a:8a brd ff:ff:ff:ff:ff:ff
> >>
> >> 9: bond1: <NO-CARRIER,BROADCAST,MULTICAST,MASTER,UP> mtu 1500 qdisc 
> >> noqueue state DOWN mode DEFAULT qlen 1000
> >>
> >>     link/ether 00:1e:67:f6:5a:8a brd ff:ff:ff:ff:ff:ff
> >>
> >>
> >>
> >> As far as I understand the IPaddr2 RA does not check the link state 
> >> of the interface – What can be done?
> >
> > You are correct. The IP address itself *is* up, even if the link is down, and it can be used locally on that host.
> >
> > If you want to monitor connectivity to other hosts, you have to do that separately. The most common approach is to use the ocf:pacemaker:ping resource. See:
> >
> > http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Pacemak
> > er_Explained/index.html#_moving_resources_due_to_connectivity_changes
> >
> >> BTW, I tried to find a solution on the bonding configuration which 
> >> disables the bond when no link is up, but I didn't find any.
> >>
> >>
> >>
> >> Tomer.
> >>
> >>
> >> _______________________________________________
> >> Users mailing list: Users at clusterlabs.org 
> >> http://lists.clusterlabs.org/mailman/listinfo/users
> >>
> >> Project Home: http://www.clusterlabs.org Getting started:
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> >
> > --
> > Ken Gaillot <kgaillot at redhat.com>
> >
> >
> >
> >
> >
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> >
> 
> 
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-- 
Ken Gaillot <kgaillot at redhat.com>

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