Shulou(Shulou.com)06/03 Report--

What is CephFS

1. Distributed file system (Distributed File System) means that the physical storage resources managed by the file system are not necessarily directly connected to the local node, but through the computer network and the node necklace.

2. CephFS uses Ceph clusters to provide POSIX-compatible file systems

3. Allow Linux to directly mount Ceph storage locally

4. It can provide shared folders like NFS or SAMBA, and the client can use the storage provided by Ceph by mounting the directory.

II. CephFS application

1. Network topology

When using CephFS, you need a MDS (metadata) server, so what is metadata?

The so-called Metadata:

①, data in any file system is divided into data and metadata

②, actual data in ordinary files at the time of data

③, and metadata refers to the system data used to describe the characteristics of a file

④, such as access rights, file owners, and distribution information (inode...) of file blocks, etc.

Therefore, the CephFS must have a MDS node

2. Deploy the metadata server

①, log in to ceph-d, and install the ceph-mds package

[root@ceph-d ~] # yum-y install ceph-mds

②, log in to ceph-a, deploy node operations

[root@ceph-a ~] # cd / etc/ceph/ [root@ceph-a ceph] # ceph-deploy mds create ceph-d

③, synchronization profile, and key

[root@ceph-a ceph] # ceph-deploy admin ceph-d

④, check the / etc/ceph directory of ceph-d, and find that the configuration file and key file have been synchronized

⑤, create two pools, one named cephfs-data to store data, and one named cephfs-metadata to store metadata

[root@ceph-a ceph] # ceph osd pool create cephfs-data 128 [root@ceph-a ceph] # ceph osd pool create cephfs-metadata 64

128indicates that the number of PG is 128. PG is the configuration group, files are saved in PG, and PG is stored in the pool

⑥, create a file system named cephfs1

[root@ceph-a ceph] # cephfs new cephfs1 cephfs-metadata cephfs-data

⑦, View statu

[root@ceph-a ceph] # ceph mds stat

⑧ view file system information

[root@ceph-a ceph] # ceph fs ls

⑨, client mount use

Create a mount directory cephfs on ceph-f

[root@ceph-f ~] # mkdir / cephfs

Mounting

[root@ceph-f] # mount-t ceph 192.168.20.144 ceph 6789 name=admin,secret=AQBBhQ9cJh/tDxAAzdcwBz3QZzPsCfWbQE0qjg== / / cephfs/-o name=admin,secret=AQBBhQ9cJh/tDxAAzdcwBz3QZzPsCfWbQE0qjg==

Parameter resolution:

-t: restrict the collection of file system types

-o: mounting option

⑩, check the mount status

[root@ceph-f] # df-h

3. View the statistics of cluster free space

[root@ceph-a ~] # ceph df

For the implementation of Ceph cluster, please refer to another blog post: https://blog.51cto.com/4746316/2329558

For the application of Ceph block devices, please refer to another blog post: https://blog.51cto.com/4746316/2330070

For Ceph object storage, please refer to my other blog post: https://blog.51cto.com/4746316/2330455

III. Summary

CephFS is rarely used in the actual production environment, because it is not mature enough, we only need to understand it here, there is no need to go too deep, and we can find out again after it is stable in the later stage.

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