Deploying a Ceph cluster with Docker

To build a Ceph cluster using Docker on a Linux server, follow these steps:

Install Docker: Install Docker on the Linux server using the command line or by downloading the installation package from the Docker official website.
Download Ceph image: Download the Ceph image from Docker Hub using the following command:
```
docker pull ceph/daemon
```
Create Ceph cluster configuration: Create the Ceph cluster configuration file on the Linux server using the following command:
```
mkdir -p /etc/ceph
cd /etc/ceph
cephadm bootstrap --mon-ip <your-server-ip>
```
This command will create a Ceph cluster configuration file that includes the Ceph administrator key and the IP address of the monitor node.

Create Ceph cluster containers: Use Docker to create Ceph cluster containers using the following commands:

docker run --name=ceph-mon -d --net=host -v /etc/ceph:/etc/ceph -e CEPH_PUBLIC_NETWORK=<your-network> -e MON_IP=<your-server-ip> ceph/daemon mon
docker run --name=ceph-osd -d --net=host -v /etc/ceph:/etc/ceph -v <your-osd-path>:/var/lib/ceph/osd/ceph-0 -e CEPH_PUBLIC_NETWORK=<your-network> ceph/daemon osd_directory
docker run --name=ceph-mgr -d --net=host -v /etc/ceph:/etc/ceph ceph/daemon mgr
docker run --name=ceph-mds -d --net=host -v /etc/ceph:/etc/ceph ceph/daemon mds

This command will create containers for the Ceph monitor node, storage nodes, manager node, and metadata server.

Verify Ceph cluster: Use the following command to verify if the Ceph cluster is working properly:
```
docker exec ceph-mon ceph -s
```
This command will display the status information of the Ceph cluster.

These are the steps to build a Ceph cluster using Docker on a Linux server.