How to configure a cluster file system on Linux

How to configure a cluster file system on Linux

Introduction:
In the modern technology era, it is becoming more and more important to achieve high availability and high performance file systems on Linux servers by configuring a cluster file system. The more important it is. The cluster file system can provide support for multiple hosts to share the file system, so that multiple hosts can read and write files at the same time. This article will introduce how to configure a basic cluster file system on Linux and provide corresponding code examples.

Part One: Overview
A cluster file system is basically a distributed file system running on multiple hosts simultaneously. It achieves shared and redundant storage of data by connecting multiple storage nodes to a shared storage device. Before setting up the cluster file system, we need to ensure that all nodes can share storage devices and have the same network connection.

Part 2: Install and configure the file system

1. Installing dependent software packages
   On the Linux system, we need to install some dependent software packages to support the cluster Normal operation of the file system. For example, on Ubuntu you can use the following command to install the required packages:

   sudo apt-get install pacemaker corosync ocfs2-tools

2. Configure Network Connection
   In order for multiple hosts to communicate with each other, we need to configure the network connection. You can configure the parameters of a network connection by editing the network configuration file. For example, on Ubuntu you can edit the /etc/network/interfaces file:

   sudo vi /etc/network/interfaces

   and add the following:

   auto eth0
   iface eth0 inet static
    address 192.168.1.10
    netmask 255.255.255.0
    gateway 192.168.1.1

3. Configuring Cluster Software
   Before configuring the cluster software, we need to create a shared storage device. Shared storage can be created using technologies like iSCSI. First, we need to install the iSCSI software package:

   sudo apt-get install tgt

   Then, configure the shared storage device according to the needs of the server. For example, on Ubuntu you can use the following command to create an iSCSI device:

   sudo tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2021-01.com.example:storage
   sudo tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/sdb

4. Configure cluster
   Install and configure cluster software, such as pacemaker and corosync, on all nodes. You can install it using the following command:

   sudo apt-get install pacemaker corosync

   Then, edit the /etc/corosync/corosync.conf file to configure the cluster parameters:

   sudo vi /etc/corosync/corosync.conf

   For example, the following is an example Configuration file:

   totem {
    version: 2
    secauth: on
    cluster_name: mycluster
    transport: udpu
   }
   
   nodelist {
    node {
        name: node1
        ring0_addr: 10.0.0.1
    }
    node {
        name: node2
        ring0_addr: 10.0.0.2
    }
    node {
        name: node3
        ring0_addr: 10.0.0.3
    }
   }
   
   quorum {
    provider: corosync_votequorum
    two_node: 1
   }
   
   logging {
    to_logfile: yes
    logfile: /var/log/corosync.log
    to_syslog: yes
   }

Part Three: Testing and Troubleshooting

1. Start the cluster software
   Start the cluster software on each node :

   sudo service corosync start
   sudo service pacemaker start

2. Configure cluster resources
   Configure cluster resources by using cluster management tools, such as crmsh or pcs. The following is an example command to use pcs to configure cluster resources:

   sudo pcs resource create fs ocf:heartbeat:Filesystem device="/dev/sdb" directory="/mnt" fstype="ocfs2" cluster_options="noatime" op start timeout="90s" op stop timeout="100s" op monitor interval="10s"

3. Test the cluster file system
   Mount the cluster file system on a node and perform read and write operations:

   sudo mount /dev/sdb /mnt

Conclusion:
Through the introduction of this article, we learned how to configure a basic cluster file system on Linux. In a real production environment, you may need more complex configurations to achieve more advanced functionality and performance. However, this basic configuration can help you get started with a clustered file system and provide you with a platform for learning and experimentation.

References:

1. Ubuntu official documentation: https://help.ubuntu.com/
2. Linux Cluster HOWTO: http://linux-ha. org/
3. Corosync official documentation: https://corosync.github.io/corosync/

Code sample:

#!/bin/bash

# Set up network interfaces
echo "auto eth0" >> /etc/network/interfaces
echo "iface eth0 inet static" >> /etc/network/interfaces
echo "address 192.168.1.10" >> /etc/network/interfaces
echo "netmask 255.255.255.0" >> /etc/network/interfaces
echo "gateway 192.168.1.1" >> /etc/network/interfaces

# Install required packages
apt-get update
apt-get install -y pacemaker corosync ocfs2-tools

# Create iSCSI storage device
tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2021-01.com.example:storage
tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/sdb

# Install and configure cluster software
apt-get install -y pacemaker corosync
cat << EOF > /etc/corosync/corosync.conf
totem {
    version: 2
    secauth: on
    cluster_name: mycluster
    transport: udpu
}

nodelist {
    node {
        name: node1
        ring0_addr: 10.0.0.1
    }
    node {
        name: node2
        ring0_addr: 10.0.0.2
    }
    node {
        name: node3
        ring0_adddr: 10.0.0.3
    }
}

quorum {
    provider: corosync_votequorum
    two_node: 1
}

logging {
    to_logfile: yes
    logfile: /var/log/corosync.log
    to_syslog: yes
}
EOF

# Start cluster software
service corosync start
service pacemaker start

# Configure cluster resource
pcs resource create fs ocf:heartbeat:Filesystem device="/dev/sdb" directory="/mnt" fstype="ocfs2" cluster_options="noatime" op start timeout="90s" op stop timeout="100s" op monitor interval="10s"

# Mount cluster filesystem
mount /dev/sdb /mnt

This article introduces how to Configure the cluster file system and provide corresponding code examples. By following the steps in this article, you can implement a highly available, high-performance file system on your Linux server. Hope this article can be helpful to you.

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