Thursday, December 26, 2013

RedHat Cluster Suite using Luci and Ricci

This how to describe an easy step by step installation of the RadHat Cluster Suite on three Centos Nodes and prepare two of them as nodes of cluster and one as a shared storage of cluster.

Here we create a cluster with IP  which shares the services from and nodes, and use a GFS filesystem reachable with iSCSI on .

Hardware requirements:
One bare-metal server for the cluster master, and two servers (virtual or physical) for the cluster / Storage nodes.

Software requirements:
RHEL6, and a RHEL subscription to the High Availability package/add-on channel. We will be working with the packages luci, ricci, rgmanager, and cman.

On all the Nodes 
#service iptables stop
#service  ip6tables stop
#chkconfig iptables off
#chkconfig ip6tables off

Disable Selinux.
#vi /etc/selinux/config

[root@node1 ~]# /etc/init.d/NetworkManager stop
[root@node1 ~]# chkconfig NetworkManager off

You will probably need to set the fully qualified domain name of each cluster node as its host name, and in its own /etc/hosts file, such as :
[root@node1 ~]# cat /etc/hosts               localhost.localdomain localhost
::1             localhost6.localdomain6 localhost6 
[Add these entry to all the Nodes]

/etc/sysconfig/network [Change on Second node and on Storage Node]

Package Installation:

[root@node1 ~]# yum install cman rgmanager luci  

At the computer running luci, initialize the luci server using the luci_admin init command. For example:
# luci_admin init
Initializing the Luci server
Creating the 'admin' user
Enter password:  <Type password and press ENTER.>
Confirm password: <Re-type password and press ENTER.>
Please wait...
The admin password has been successfully set.
Generating SSL certificates...
Luci server has been successfully initialized
Restart the Luci server for changes to take effect
eg. service luci restart

   [root@node1 ~]# service luci start
Start luci...                                              [  OK  ]
Point your web browser to (or equivalent) to access luci

 [root@node1 ~]# yum install  ricci ; passwd ricci ; service ricci start ; chkconfig ricci on ;service rgmanager start ; chkconfig rgmanager on ; service cman start ; chkconfig cman on

At a Web browser, place the URL of the luci server into the URL address box and click Go (or the equivalent). The URL syntax for the luci server is The first time you access luci, two SSL certificate dialog boxes are displayed. Upon acknowledging the dialog boxes, your Web browser displays the luci login page

[root@node2 ~]# yum install cman rgmanager ricci ; passwd ricci ; service ricci start ; chkconfig ricci on ; service rgmanager start ; chkconfig rgmanager on ; service cman start ; chkconfig cman on

#yum install lvm2 -y

#yum install iscsi-initiator-utils* -y

ON Storage Node
[root@isci ~]# yum install iscsi-target-utils* -y

[root@iscsi ~]# rpm -qa | grep target*



vi /etc/tgt/targets.conf

# Sample target with one LUN only. Defaults to allow access for all initiators:
    backing-store /dev/sdb

#/etc/init.d/tgtd start
# chkcongif tgtd on

Proof of Concept:

[root@node1 ~]#  iscsiadm -m node -T -p --login
Logging in to [iface: default, target:, portal:,3260] (multiple)
Login to [iface: default, target:, portal:,3260] successful.

[root@node2 ~]# iscsiadm -m node -T -p --login
Logging in to [iface: default, target:, portal:,3260] (multiple)

Login to [iface: default, target:, portal:,3260] successful.

check the iSCSI mapped device is /dev/sdb (otherwise change the following commands), then proceed creating a new Physical Volume, a new Volume Group and a new Logical Volume to use as a shared storage for cluster nodes, by using the following commands :

[root@node1 ~]dmesg
sdb: unknown partition table
sd 3:0:0:1: [sdb] Attached SCSI disk

[root@node1 ~]pvcreate /dev/sdb1

[root@node1 ~]# vgcreate -c y redhat /dev/sdb1
  Clustered volume group "redhat" successfully created

[root@node1 ~]# lvcreate -L 1GB redhat -n gfscluster
  Error locking on node Volume group for uuid not found: 7Tx6QN8ayQZ8FoAJZa6uX7qgP81FpwpOfcYKWhOLks0JESQ3snRbJxmXO25hf0Rx
  Failed to activate new LV.

Solution for the above issue :
To resolve the issue, updated lvm cache on all nodes using:
#clvmd -R
Then scanned volumes using
[root@node1 ~]# lvcreate -L 1GB redhat -n gfscluster
  Logical volume "gfscluster" created
[root@node1 ~]# lvs
  LV         VG       Attr       LSize Pool Origin Data%  Move Log Cpy%Sync Convert
  gfscluster redhat   -wi-a----- 1.00g
  lv_root    vg_node1 -wi-ao---- 7.54g
  lv_swap    vg_node1 -wi-ao---- 1.97g

[root@node1 ~]# mkfs.gfs2 -plock_nolock  -j2 /dev/redhat/gfscluster
This will destroy any data on /dev/redhat/gfscluster.
It appears to contain: symbolic link to `../dm-2'

Are you sure you want to proceed? [y/n] y

Device:                    /dev/redhat/gfscluster
Blocksize:                 4096
Device Size                1.00 GB (262144 blocks)
Filesystem Size:           1.00 GB (262142 blocks)
Journals:                  2
Resource Groups:           4
Locking Protocol:          "lock_nolock"
Lock Table:                ""
UUID:                      383c06a0-faea-23af-d49d-1c45220e357b

Edit fstab and add
/dev/redhat/gfscluster /mnt/gfs2 gfs defaults,acl 0 0
#mount -a [Mount the devices on all the cluster nodes]

[root@node1 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
                      7.5G  2.2G  5.2G  30% /
tmpfs                 497M   26M  472M   6% /dev/shm
/dev/sda1             485M   34M  426M   8% /boot
                      1.0G  259M  766M  26% /mnt/gfs2

Check the LUN
[root@iscsi ~]# tgtadm --lld iscsi --op show --mode target
Target 1:
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags:
        LUN: 1
            Type: disk
            SCSI ID: IET     00010001
            SCSI SN: beaf11
            Size: 2147 MB, Block size: 512
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/sdb
            Backing store flags:
    Account information:
    ACL information:

configure apache to use one or more virtual host on folder on the same storage.
for example, on both nodes, add to the end of /etc/httpd/conf/httpd.conf
#vi /etc/httpd/conf/httpd.conf
ServerAdmin webmaster@mgmt.local
DocumentRoot /data/websites/default
ServerName rhel-cluster.mgmt.local
ErrorLog logs/rhel-cluster_mgmt_local-error_log
CustomLog logs/rhel-cluster_mgmt_local-access_log common
save and exit
create two directories under /data,
#mkdir /data/websites
#mkdir /data/websites/default
create an index file
#vi /data/websites/default/index.html
Cluster Nodes Conf…..
apache set to start at boot time
#chkconfig httpd on
#service httpd start
check in browser to access luci
1. select the cluster tab.
2. Click Create a New Cluster.
3. At the Cluster Name text box, enter cluster name “rhel-cluster.
Add the node name and password for each cluster node.
4. Click Submit to download, install, cofigure & start cluster software in each node
Add a resource,
choose IP Address and use
Create a service named “cluster”, add the resource “IP Address” you had created before,
check “Automatically start this service”
check “Run exclusive”
choose “Recovery policy” as “Relocate”
Save the service.
enable it, and start it on one cluster node.
check cluster configuration file
#cat /etc/cluster/cluster.conf
check  shared IP Address
#/sbin/ip addr list
Check the Cluster

shutdown/unplug one host  from network & you should be able to see the website still on is reachable.

1 comment:

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