How to set up highly available network storage (such as NFS) on Linux

How to set up highly available network storage (such as NFS) on Linux

Introduction:
Network File System (NFS) is a commonly used distributed file system that allows different computers to shared documents. In a Linux environment, we can ensure system stability and reliability by setting up highly available network storage. This article will explain how to set up highly available NFS on Linux and provide some code examples.

Step 1: Install NFS
First, we need to install the NFS package on all nodes. In most Linux distributions, you can install it using the following command:

$ sudo apt-get install nfs-kernel-server

Step Two: Configure NFS
Next, we NFS needs to be configured on the master node. Edit the /etc/exports file and add the configuration of the shared directory. For example, if we want to share the directory /var/nfsdata and allow all nodes to access it, we can add the following line to the /etc/exports file:

/var/nfsdata *(rw,sync,no_subtree_check )

You can also set other options as needed, such as only allowing access to specific nodes, read-only permissions, etc.

Step 3: Start the NFS service
After completing the configuration, we need to start the NFS service and ensure that it starts automatically when the system starts. In most Linux distributions, you can use the following command to start and set up auto-start at boot:

$ sudo systemctl start nfs-kernel-server
$ sudo systemctl enable nfs-kernel-server

Step 4: Set up high availability of network storage
In order to achieve high availability of network storage, we can use the Linux-HA toolkit to monitor and manage NFS services. The following is a simple code example that demonstrates how to use the Linux-HA toolkit to set up highly available NFS.

Step 1: Install the Linux-HA toolkit
In most Linux distributions, you can use the following command to install the Linux-HA toolkit:

$ sudo apt-get install pacemaker corosync

Step 2: Configure Linux-HA
Next, we need to configure Linux-HA to achieve high availability of network storage. First, edit the /etc/ha.d/authkeys file on all nodes and add the following:

auth 3
3 md5 YourSharedSecretKey

Then, edit /etc/ha. d/ha.cf file and set the following content:

logfile /var/log/ha-log
logfacility local0
keepalive 2
deadtime 30
warntime 10
initdead 120
udpport 694
auto_failback on
node node1
node node2

Step 3: Configure the resource agent
We also need to configure the resource agent to achieve high availability of the NFS service . Create a new file /etc/ha.d/groups and add the following lines:

group nfs-group node1 node2
resource nfs_res_nfs1

  exclusive lockfile
  fsid=0
  block_device /dev/nfs_share
  script /usr/lib/ocf/resource.d/filesystem/nfs
  op monitor interval="10s"

In the above configuration, we create Create a resource group named nfs-group and assign the nfs_res_nfs1 resource to the resource group. You can modify the resource's name and other parameters as needed.

Step 4: Start the Linux-HA service
After completing the configuration, we can start the Linux-HA service and ensure that it starts automatically when the system starts. In most Linux distributions, you can use the following command to start and set up auto-start at boot:

$ sudo systemctl start pacemaker
$ sudo systemctl enable pacemaker

Conclusion:
Through the above steps, we can set up highly available network storage (such as NFS) on Linux. This improves system stability and reliability and ensures data security and accessibility. Hope this article is helpful to you.

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