[Linux-cluster] Two nodes DRBD - Fail-Over Actif/Passif Cluster.

vincent.blondel at ing.be vincent.blondel at ing.be
Mon Feb 14 21:02:40 UTC 2011

Hello all,

I just installed last week two servers, each of them with Redhat Linux Enterprise 6.0 on it for hosting in a near future Blue Coat Reporter. Installation is ok but now I am trying to configure these both servers in cluster. 

First of all, I never configured any cluster with Linux ...

Servers are both HP DL380R06 with disk cabinet directly attached on it. (twice exactly same hardware specs).

What I would like to get is simply getting an Actif/Passif clustering mode with bidirectional disk space synchronization. This means, both servers are running. Only, the first one is running Reporter. During this time, disk spaces are continuously synchronized. When first one is down, second one becomes actif and when first one is running again, it synchronizes the disks and becomes primary again.

server 1 is reporter1.lab.intranet with ip
server 2 is reporter2.lab.intranet with ip

the load balanced ip should be ..

After some days of research on the net, I came to the conclusion that I could be happy with a solution including, DRBD/GFS2 with Redhat Cluster Suite.

I am first trying to get a complete picture running on two vmware fusion (Linux Redhat Enterprise Linux 6) on my macosx before configuring my real servers.

So, after some hours of research on the net, I found some articles and links that seem to describe what I wanna get ...


and the DRBD packages for RHEL6 that I did not find anywhere ..


I just only configured till now the first part, meaning cluster services but the first issue occur ..

below the cluster.conf file ...

<?xml version="1.0"?>
<cluster name="cluster" config_version="6">
  <!-- post_join_delay: number of seconds the daemon will wait before
                        fencing any victims after a node joins the domain
       post_fail_delay: number of seconds the daemon will wait before
            	        fencing any victims after a domain member fails
       clean_start    : prevent any startup fencing the daemon might do.
		        It indicates that the daemon should assume all nodes
		        are in a clean state to start. -->
  <fence_daemon clean_start="0" post_fail_delay="0" post_join_delay="3"/>
    <clusternode name="reporter1.lab.intranet" votes="1" nodeid="1">
        <!-- Handle fencing manually -->
        <method name="human">
          <device name="human" nodename="reporter1.lab.intranet"/>
    <clusternode name="reporter2.lab.intranet" votes="1" nodeid="2"> 
        <!-- Handle fencing manually -->
        <method name="human">
          <device name="human" nodename="reporter2.lab.intranet"/>
  <!-- cman two nodes specification -->
  <cman expected_votes="1" two_node="1"/>
    <!-- Define manual fencing -->
    <fencedevice name="human" agent="fence_manual"/>
        <failoverdomain name="example_pri" nofailback="0" ordered="1" restricted="0">
           <failoverdomainnode name="reporter1.lab.intranet" priority="1"/>
           <failoverdomainnode name="reporter2.lab.intranet" priority="2"/>
           <ip address="" monitor_link="on" sleeptime="10"/>
           <apache config_file="conf/httpd.conf" name="example_server" server_root="/etc/httpd" shutdown_wait="0"/>
      <service autostart="1" domain="example_pri" exclusive="0" name="example_apache" recovery="relocate">
                <ip ref=""/>
                <apache ref="example_server"/>

and this is the result I get on both servers ...

[root at reporter1 ~]# clustat
Cluster Status for cluster @ Mon Feb 14 22:22:53 2011
Member Status: Quorate

 Member Name                                      ID   Status
 ------ ----                                      ---- ------
 reporter1.lab.intranet                               1 Online, Local, rgmanager
 reporter2.lab.intranet                               2 Online, rgmanager

 Service Name                            Owner (Last)                            State         
 ------- ----                            ----- ------                            -----         
 service:example_apache                  (none)                                  stopped       

as you can see, everything is stopped or in other words nothing runs .. so my question are :

did I forget something in my conf file ?
did I make something wrong in my conf file ?
do I have to configure manually load balanced ip as an alias ip on both sides or is it done automatically by redhat cluster ?
I just made a simple try with apache but I do not find anywhere reference to the start/stop script for apache in the examples, is that normal ??
do you have some best practice regarding this picture ??

many thks to help me because I certainly have a bad understanding on some points.

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