How to configure virtualized storage (like Ceph) on Linux

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

Introduction:
Virtualized storage is an integral part of modern data center architecture, which can provide high availability and scalability and data redundancy. On Linux, Ceph is a widely used virtualization storage solution. This article will introduce how to configure Ceph on Linux. We'll cover the basic steps for installing, configuring, and using Ceph, and provide some code examples to help you understand better.

Part 1: Install Ceph

1. Update the system
Before installing Ceph, we first need to update the system. Open the terminal and execute the following command:

sudo apt-get update
sudo apt-get upgrade

2. Install the Ceph software package
Execute the following command to install the Ceph software package:

sudo apt-get install ceph-deploy

Part 2: Configure Ceph

1. Create a Ceph cluster
Before configuring Ceph, we need to create a Ceph cluster. Open a terminal and execute the following command:

mkdir my-cluster
cd my-cluster
ceph-deploy new {ceph-mon-node1} {ceph-mon-node2} {ceph-mon-node3}

Among them, ceph-mon-node1, ceph-mon-node2, ceph-mon-node3 is the hostname or IP address of the node you want to configure as a Ceph monitor.

2. Install Ceph Monitor
Execute the following command to install and configure Ceph Monitor:

ceph-deploy install {ceph-mon-node1} {ceph-mon-node2} {ceph-mon-node3}
ceph-deploy mon create-initial

3. Add OSD Node
In order to add an Object Storage Device (OSD), We need to perform the following steps on each OSD node. First, open a terminal and execute the following command:

ceph-deploy install {ceph-osd-node1} {ceph-osd-node2} {ceph-osd-node3}
ceph-deploy osd create --data /dev/{osd-device} {ceph-osd-node1}

where, ceph-osd-node1, ceph-osd-node2, ceph-osd-node3 is the hostname or IP address of the node you want to configure as a Ceph OSD, and osd-device is the device you want to use as the OSD.

Part 3: Using Ceph

1. Create and import the pool
Execute the following commands to create a Ceph pool and import data:

ceph osd pool create {pool-name} {pg-num}
rados put {object-name} {file-path} --pool {pool-name}

Among them, pool-name is the name of the pool you want to create, pg-num is the number of PGs in each pool, object-name is the name of the object you want to import, file-path is the path of the object you want to import.

2. Reading and writing data
To read and write data from the Ceph pool, you can execute the following commands:

rados -p {pool-name} get {object-name} {output-file}
rados -p {pool-name} put {object-name} {input-file}

Where, pool-name is the name of the pool you want to read or write, object-name is the name of the object you want to read or write, output-file is the read result The output file, input-file is the input file for the write operation.

Conclusion:
In this article, we introduced how to configure virtualized storage (such as Ceph) on Linux. We cover the basic steps for installing, configuring, and using Ceph, and provide some code examples to help you understand better. I hope this article can help you successfully complete the configuration of Ceph and achieve a high-availability and scalable virtualized storage solution. Good luck!

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