How to configure highly available virtualized storage (such as Ceph) on Linux

How to configure highly available virtualized storage (such as Ceph) on Linux

Introduction:
In modern cloud computing environments, highly available virtualized storage is crucial. Ceph is an open source distributed storage system that provides high availability and scalability and is widely used in virtualized environments. This article will introduce how to configure highly available virtualized storage on Linux and provide relevant code examples.

Part One: Installation and Configuration of Ceph

Step One: Install Ceph
Use the following command to install Ceph on the Linux system:

sudo apt-get install ceph

Step Two: Configure Ceph cluster
Edit the /etc/ceph/ceph.conf file and add the following content:

[global]
fsid = <fsid>
mon initial members = <mon-node1>, <mon-node2>, <mon-node3>
mon host = <ip-node1>, <ip-node2>, <ip-node3>

[osd]
osd journal size = 1024

[mon]
mon data = /var/lib/ceph/mon/$cluster-$id
mon initial members = <mon-node1>, <mon-node2>, <mon-node3>

[mds]
mds data = /var/lib/ceph/mds/$cluster-$id

Replace <fsid>, <mon-node1>, <mon-node2>, <mon-node3>, <ip-node1>,<ip-node2> and <ip-node3> are the corresponding values. These values ​​can be set according to the specific environment.

Step 3: Start the Ceph cluster
Execute the following command to start the Ceph cluster:

sudo systemctl start ceph-mon.target
sudo systemctl start ceph-osd.target
sudo systemctl start ceph-mds.target

Part 2: Configure high availability

Step 1: Install Corosync and Pacemaker
Use the following commands to install Corosync and Pacemaker on your Linux system:

sudo apt-get install corosync pacemaker

Step 2: Configure Corosync
Edit the /etc/corosync/corosync.conf file, And add the following:

totem {
        cluster_name: <cluster-name>
        token: <token>
        secauth: off
        transport: udpu
        interface {
                ringnumber: 0
                bindnetaddr: <ip-node1>
                mcastaddr: <mcast-addr>
                mcastport: <mcast-port>
        }
        interface {
                ringnumber: 1
                bindnetaddr: <ip-node2>
                mcastaddr: <mcast-addr>
                mcastport: <mcast-port>
        }
        interface {
                ringnumber: 2
                bindnetaddr: <ip-node3>
                mcastaddr: <mcast-addr>
                mcastport: <mcast-port>
        }
}

quorum {
        provider: corosync_votequorum
        expected_votes: <num-nodes>
        two_node: 1
}

nodelist {
        node {
                ring0_addr: <ip-node1>
                nodeid: 1
        }
        node {
                ring0_addr: <ip-node2>
                nodeid: 2
        }
        node {
                ring0_addr: <ip-node3>
                nodeid: 3
        }
}

Replace <cluster-name>, <token>, <ip-node1>, <ip-node2>, <ip-node3>, <mcast-addr>, <mcast-port> and <num-nodes> are the corresponding values.

Step 3: Start Corosync and Pacemaker
Execute the following command to start Corosync and Pacemaker:

sudo systemctl enable corosync
sudo systemctl enable pacemaker
sudo systemctl start corosync
sudo systemctl start pacemaker

Step 4: Configure Ceph resources
Execute the following command to configure Ceph resources :

sudo pcs resource create ceph_mon ocf:ceph:mon 
--params mon_name=mon 
op monitor interval=10s

sudo pcs resource create ceph_osd ocf:ceph:osd 
--params osd_device=/dev/sdb 
op start timeout=90s 
op stop timeout=90s 
op monitor interval=10s

sudo pcs resource create ceph_mds ocf:ceph:mds 
--params mds_name=mds 
op monitor interval=10s

These commands will create Ceph's mon, osd and mds resources and specify some parameters.

Conclusion:
The above is how to configure highly available virtualized storage on Linux. By using Ceph and Corosync-Pacemaker, we can easily implement a highly available virtualized storage environment. I hope this article can provide some help to readers in configuring highly available virtualized storage on Linux.

Reference materials:

• Ceph official documentation: https://docs.ceph.com/
• Corosync official documentation: https://corosync.github. io/corosync-docs/index.html
• Pacemaker official documentation: http://clusterlabs.org/
• Linux State Manager User Guide: https://access.redhat.com/ documentation/en-us/red_hat_enterprise_linux/7/html/high_availability_add-on_reference/
• Linux Cluster Package Guide: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/high_availability_add -on_guide/

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