REDHAT CLUSTER part 3 - Adding cluster resources and services

Make sure selinux is disabled or in permissive for testing


Adding cluster resources and services

Cluster SERVICE = 1 or more RESOURCES            

resource are defined within <rm>  </rm> eg.

<rm>
<resources> ...
...
</resources>
</rm>

cluster resources are configured with resource scripts and located at /usr/share/cluster along with cluster resources



[root@c1 cluster]# ls /usr/share/cluster/
apache.metadata                 lvm.metadata          oralistener.metadata
apache.sh                       lvm.sh                oralistener.sh
...
..


On any one node for example im on node 3 edit /etc/cluster/cluster.conf





 [root@c3 cluster]# cat cluster.conf

<?xml version="1.0"?>
<cluster config_version="4" name="hacluster">
    <logging debug="off"/>
    <clusternodes>
        <clusternode name="c1" nodeid="1"/>
        <clusternode name="c2" nodeid="2"/>
        <clusternode name="c3" nodeid="3"/>
    </clusternodes>
    <rm>
        <failoverdomains>
            <failoverdomain name="simple" nofailback="1" ordered="0" restricted="0">
                <failoverdomainnode name="c1"/>
                <failoverdomainnode name="c2"/>
                <failoverdomainnode name="c3"/>
            </failoverdomain>
        </failoverdomains>
        <resources>
            <ip address="192.168.0.88" family="IPv4" prefer_interface="eth1"/>
            <apache config_file="conf/httpd.conf" name="apache" server_root="/etc/httpd" shutdown_wait="60"/>
        </resources>
    </rm>
</cluster>

validate configuration

[root@c3]# ccs_config_validate
Configuration validates

Distribute cluster conf with below command and enter ricci user password for all nodes respectively

[root@c3]# cman_tool version -r
You have not authenticated to the ricci daemon on c3
Password:
You have not authenticated to the ricci daemon on c2
Password:
You have not authenticated to the ricci daemon on c1
Password:

SERVICES

We can configure a web server cluster service with respect to the configured IP address and Apache web server resources with the following CMAN configuration file syntax:

 Make sure to increase config_version here i have number "8"

[root@c1 ~]# ccs_config_dump
<?xml version="1.0"?>
<cluster config_version="8" name="hacluster">
    <logging debug="off"/>
    <clusternodes>
        <clusternode name="c1" nodeid="1"/>
        <clusternode name="c2" nodeid="2"/>
        <clusternode name="c3" nodeid="3"/>
    </clusternodes>
    <rm>
        <failoverdomains>
            <failoverdomain name="simple" nofailback="1" ordered="0" restricted="0">
                <failoverdomainnode name="c1"/>
                <failoverdomainnode name="c2"/>
                <failoverdomainnode name="c3"/>
            </failoverdomain>
        </failoverdomains>
        <resources>
            <ip address="192.168.0.88" family="IPv4" prefer_interface="eth0"/>
            <apache config_file="conf/httpd.conf" name="apache" server_root="/etc/httpd" shutdown_wait="60"/>
        </resources>
        <service autostart="1" name="webserver" recovery="relocate">
            <ip ref="192.168.0.88"/>
            <apache ref="apache"/>
        </service>
    </rm>
    <cman nodename="c1" cluster_id="10117"/>
</cluster>

[root@c3 ~]# clustat
Cluster Status for hacluster @ Fri Aug 28 17:00:32 2015
Member Status: Quorate

 Member Name                             ID   Status
 ------ ----                             ---- ------
 c1                                          1 Online, rgmanager
 c2                                          2 Online, rgmanager
 c3                                          3 Online, Local, rgmanager

 Service Name                   Owner (Last)                   State        
 ------- ----                   ----- ------                   -----        
 service:webserver              c3                             started 

[root@c3 ~]# ip ad | grep inet
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
    inet 192.168.0.77/24 brd 192.168.0.255 scope global eth0
    inet 192.168.0.88/24 scope global secondary eth0 #virtual ip
    inet6 fe80::a00:27ff:fe2e:2480/64 scope link