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This article mainly introduces "how CentOS monopolizes the activation of volume groups". In daily operation, I believe many people have doubts about how CentOS monopolizes the activation of volume groups. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "how CentOS monopolizes the activation of volume groups". Next, please follow the editor to study!

Background: exclusive activation of the shared disk needs to be implemented on the dual computers of the CentOS, that is, the shared disk can only be mounted on one of the machines, and the other machine cannot be mounted at the same time. If necessary, you can manually switch and mount to another machine.

Implementation method: relying on rhcs cluster function, exclusive activation using vgchange-a / e

I. Environmental preparation

# cat / etc/redhat-release

CentOS release 6.6 (Final)

Vim / etc/hosts

192.168.58.20 vm-test01

192.168.58.21 vm-test02

Second, install the cluster

1. Install rhcs cluster related software packages

Yum install-y cluster-glue resource-agents pacemaker

Yum install-y luci ricci cman openais rgmanager lvm2-cluster gfs2-utils

2. Start the cluster service

Service luci start

Service ricci start

Service rgmanager start

Service cman start

If there is an error in starting cman:

Starting cman... Xmlconfig cannot find / etc/cluster/cluster.conf [FAILED] is because the node has not joined the cluster and no configuration file / etc/cluster/cluster.conf has been generated

Negligible

3. Set the cluster service to start itself.

Chkconfig luci on

Chkconfig ricci on

Chkconfig rgmanager on

Chkconfig cman on

4. Modify the password of ricci user

Use the passwd ricci command to set the user's ricci password to the password of root

Third, configure clusters

Log in to https://192.168.58.20:8084 with ie

Create cluster

Create a volume group with a shared disk

Pvcreate / dev/sdb

Vgcreate vgrhcs1 / dev/sdb

Lvcreate-L 20m-n lvtest1 vgrhcs1

Mkfs.ext3 / dev/vgrhcs1/lvtest1

Mkdir / rhcs1

Synchronize volume group information on another node

Pvscan

Vgscan

Vgchange-an vgrhcs1

Execute on both nodes:

Vim / etc/lvm/lvm.conf

Locking_type = 3

In the node activated by vg, add the cluster attribute of the node and execute

Vgchange-an vgrhcs1

Vgchange-c y vgrhcs1

Exclusive Activation Volume Group

Vgchange-an e vgrhcs1

On mount / dev/vgrhcs1/lvtest1 / rhcs1 mount, it is guaranteed that the vg cannot be deactivated at any node.

Note:

Vgchange-a y vgxx means to activate a volume group on all nodes

Vgchange-an vgxx means to deactivate the volume group on all nodes

Vgchange-an e vgxx means to activate the volume group exclusively on a node

At this point, the study on "how CentOS monopolizes the activation of volume groups" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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