[ClusterLabs] Regarding IP tables and IP Address clone
somanath.jeeva at ericsson.com
Wed Dec 23 02:17:29 EST 2015
> I am trying to use ip loadbalancing using cloning feature in pacemaker. but After 15 min the virtual ip becomes unreachable. Below is the pacemaker cluster config
> # pcs status
> Cluster name: DES
> Last updated: Tue Dec 22 08:57:55 2015
> Last change: Tue Dec 22 08:10:22 2015
> Stack: cman
> Current DC: node-01 - partition with quorum
> Version: 1.1.11-97629de
> 2 Nodes configured
> 2 Resources configured
> Online: [ node-01 node-02 ]
> Full list of resources:
> Clone Set: ClusterIP-clone [ClusterIP] (unique)
> ClusterIP:0 (ocf::heartbeat:IPaddr2): Started node-01
> ClusterIP:1 (ocf::heartbeat:IPaddr2): Started node-02
> #pcs config
> Cluster Name: DES
> Corosync Nodes:
> node-01 node-02
> Pacemaker Nodes:
> node-01 node-02
> Clone: ClusterIP-clone
> Meta Attrs: clone-max=2 clone-node-max=2 globally-unique=true
> Resource: ClusterIP (class=ocf provider=heartbeat type=IPaddr2)
> Attributes: ip=10.61.150.55 cidr_netmask=23 clusterip_hash=sourceip
> Operations: start interval=0s timeout=20s (ClusterIP-start-timeout-20s)
> stop interval=0s timeout=20s (ClusterIP-stop-timeout-20s)
> monitor interval=5s (ClusterIP-monitor-interval-5s)
> Stonith Devices:
> Fencing Levels:
> Location Constraints:
> Ordering Constraints:
> Colocation Constraints:
> Cluster Properties:
> cluster-infrastructure: cman
> cluster-recheck-interval: 0
> dc-version: 1.1.11-97629de
> stonith-enabled: false
> Pacemaker and Corosync version:
> Pacemaker - 1.1.12-4
> Corosync - 1.4.7
> Is the issue due to configuration error or firewall issue.
> With Regards
> Somanath Thilak J
>The configuration looks fine (aside from fencing not being configured),
>so I'd suspect a network issue.
>The IPaddr2 cloning relies on multicast MAC addresses (at the Ethernet
>level, not multicast IP), and many switches have issues with that. Make
>sure your switch supports multicast MAC (and if necessary, has it
>enabled on the relevant ports).
>Some people have found it necessary to add a static ARP entry for the
>cluster IP/MAC in their firewall and/or switch.
Thanks for the quick reply.
I will check with our IT team regarding the multicast MAC at switch level.
But the Virtual IP is reachable for 15 minutes or so after I start the pacemaker/Corosync service. After which it becomes unreachable. However when I restart the iptables service it becomes reachable again for another 15 min.
Would this be because of firewall configurations.
Somanath Thilak J
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