Home / server / Questions / 529550
Accepted
Iain Hallam
Asked: 2013-08-09 02:11:27 +0800 CST

Why has Red Hat Cluster Suite stopped working?

  • 772

I've been testing the Cluster Suite on CentOS 6.4, and had it working fine, but I noticed today [8th August, when this question was originally asked] that it's not liking the config that was previously working. I tried to recreate a configuration from scratch using CCS, but that gave validation errors.

Edited 21st August:

I've now reinstalled the box completely from CentOS 6.4 x86_64 minimal install, adding the following packages and their dependencies:

yum install bind-utils dhcp dos2unix man man-pages man-pages-overrides nano nmap ntp rsync tcpdump unix2dos vim-enhanced wget

and

yum install rgmanager ccs

The following commands all worked:

ccs -h ha-01 --createcluster test-ha
ccs -h ha-01 --addnode ha-01
ccs -h ha-01 --addnode ha-02
ccs -h ha-01 --addresource ip address=10.1.1.3 monitor_link=1
ccs -h ha-01 --addresource ip address=10.1.1.4 monitor_link=1
ccs -h ha-01 --addresource ip address=10.110.0.3 monitor_link=1
ccs -h ha-01 --addresource ip address=10.110.8.3 monitor_link=1
ccs -h ha-01 --addservice routing-a autostart=1 recovery=restart
ccs -h ha-01 --addservice routing-b autostart=1 recovery=restart
ccs -h ha-01 --addsubservice routing-a ip ref=10.1.1.3
ccs -h ha-01 --addsubservice routing-a ip ref=10.110.0.3
ccs -h ha-01 --addsubservice routing-b ip ref=10.1.1.4
ccs -h ha-01 --addsubservice routing-b ip ref=10.110.8.3

and resulted in the following config:

<?xml version="1.0"?>
<cluster config_version="13" name="test-ha">
    <fence_daemon/>
    <clusternodes>
        <clusternode name="ha-01" nodeid="1"/>
        <clusternode name="ha-02" nodeid="2"/>
    </clusternodes>
    <cman/>
    <fencedevices/>
    <rm>
        <failoverdomains/>
        <resources>
            <ip address="10.1.1.3" monitor_link="1"/>
            <ip address="10.1.1.4" monitor_link="1"/>
            <ip address="10.110.0.3" monitor_link="1"/>
            <ip address="10.110.8.3" monitor_link="1"/>
        </resources>
        <service autostart="1" name="routing-a" recovery="restart">
            <ip ref="10.1.1.3"/>
            <ip ref="10.110.0.3"/>
        </service>
        <service autostart="1" name="routing-b" recovery="restart">
            <ip ref="10.1.1.4"/>
            <ip ref="10.110.8.3"/>
        </service>
    </rm>
</cluster>

However, if I use ccs_config_validate or try to start the cman service, it fails with:

Relax-NG validity error : Extra element rm in interleave
tempfile:10: element rm: Relax-NG validity error : Element cluster failed to validate content
Configuration fails to validate

What's going on? This used to work!

centos

2 Answers

  1. I think you are missing the failover domains, if you wanna define a service on redhat cluster, first you need to define a failoverdomain, you can use a failoverdomain for many services or one per service.

    If you need more information about the failover domain "man clurgmgrd"

    A failover domain is an ordered subset of members to which a service may be bound. The following

    is a list of semantics governing the options as to how the different configuration options affect the behavior of a failover domain:

    • 0
  2. Best Answer

    It's just started working again, after more yum update dancing. I have compared the old and new /var/lib/cluster/cluster.rng and, surprise, surprise, there's a difference. The one on the systems that didn't work was missing any definitions for the <ip> element.

    The current incarnation of the system was installed from the same minimal CD, and I have a step-by-step procedure of commands to cut and paste, which worked several times while I was developing it, then failed for nearly two months, now starts working again. I've built the box about half a dozen times, so I guess it's not the procedure.

    A slip up on Red Hat's part, perhaps, but I'm not sure how to find out what changes were checked into this file in the last two months.

    • 0