Ceph practice summary: the configuration of the RBD block device client in Centos, cephrbd

Ceph practice summary: the configuration of the RBD block device client in Centos, cephrbd

Before proceeding to this chapter, you need to complete the basic cluster building, please refer to the http://blog.csdn.net/eric_sunah/article/details/40862215

Ceph Block devices are also calledRBDOrRADOS. Block Device

During the experiment, a virtual machine can be used as the ceph-client node. To ensure cluster stability, do not perform the following operations on the cluster node.

Install Ceph

1. Use OS Recommendations to determine whether your client OS meets the basic requirements.

2. Use on Management NodesCeph-deployInCeph-clientIf ceph is installed on the node, it is called cephclient.

   ceph-deploy install cephclient

3. Use on Management Nodesceph-deployCopy the ceph configuration file andCeph. client. admin. keyringToOn cephclient

   ceph-deploy admin cephclient

   Ceph-deployWill copy the keyring file/Etc/ceph directory. To ensure security, you can set the appropriate permissions for the file (e.g .,Sudo chmod + r/etc/ceph. client. admin. keyring).

Configure Block devices

1. Create a block device image on the cephclient Node

   rbd create testdevice --size 40960 [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring]

2. Map the image to a block device on the cephclient Node

   sudo rbd map foo --pool rbd --name client.admin [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring]

3. Format Block devices on the cephclient Node

   sudo mkfs.ext4 -m0 /dev/rbd/rbd/testdevice

4. Mount the device.

   sudo mkdir /mnt/ceph-block-devicesudo 

   sudo mount -t ext4 /dev/rbd/rbd/testdevice /mnt/ceph-block-devicesudo

   cd /mnt/ceph-block-devicesudo

   Check Result

"Cocould not find module RBD" error occurs when the problem maps rbd.

Cause and solution: if the above prompt appears, it indicates that the kernel has not compiled the rbd module. The solution is to upgrade the kernel version. For specific steps to upgrade, see: http://blog.csdn.net/eric_sunah/article/details/41282379
In the steps of make menuconfig, you can find rbd in block drive and select it.