What are the uses of Ceph file system?

CephFS strives to provide an advanced, versatile, extremely affordable and powerful file for a wide variety of applications, including traditional use cases such as shared home file sites, HPC workspace, and workflow. CephFS achieves these goals through a variety of architecture options.

How to start a scrub operation in Ceph?

To run the appropriate directory tree scrub, use the following command: ceph detect mds. is a service and the tag is an optional custom string tag (by default it is an absolutely generated UUID). Here's a sample guide:

Solved: Suggestions For Ceph Filesystem Recovery Howto

October 2, 2021 By Lucas Nibbi Off

Table of Contents

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You should read these troubleshooting methods if you receive an error message regarding the Ceph filesystem.

4.1. Client Authentication

By default, clients are really limited in the routes they are allowed to take at the end. Also, if your clients mount a subdirectory like / home / , the entire MDB does not check if subsequent directory operations have been fixed.

If you often use the default client keychain location and name; H. /etc/ceph/ceph.client. .keyring , the client does not need the new --keyring option.

To prevent customers from sending or reading expensive data, In addition to those used for the Ceph filesystem, configure a useful OSD authentication feature that restricts access to CephFS datapools:

To prevent clients from changing the data area used for files or directories, take advantage of the p modifier in MDS authorization functions.

4.2.Ceph Mounts Filesystems As Kernel Clients

On the client node, I would say to activate the Red Hat Ceph Storage 2 Tools repository.Make sure the experts claim that the ceph-common package is deployed to the client, and install if ignored:Mount the Ceph filesystem.

Red Hat Ceph Storage 1 is possible on the client node. Deposit 5 instruments. For more information, see the section on Activating Ceph Repositories in the Basic Installation Guide for Red Hat Enterprise Linux or the section on Activating Ceph Repositories in the Ubuntu Installation Guide.
Make sure the ceph-common package is installed on the client, and if not:
- On Red Hat Enterprise Linux:
```
 # yum install ceph-common 
```
- On Ubuntu:
```
 $ sudo apt-get install ceph-common 
```
Mount the Ceph filesystem. To specify multiple watch addresses, separate them with commas in the mount command, or change the DNS server to resolve one hostname to multiple IP addresses and pass that name to. The organizer is in the mount command. For more information on configuring DNS servers, see the DNS Server Chapter in the Red Hat Linux Enterprise 7 Networking Guide.
```
 mount -t ceph : 6789, : 6789, : 6789: /  
```
Example:
```
 # increase -t ceph mon1: 6789, mon2: 6789, mon3: 6789: // mnt / cephfs 
```
To find a Ceph filesystem with new cephx authentication enabled, enter the PC username and secret file:
```
 mount -m ceph : 6789: /  Name = , -o secretfile =  
```
Example
```
 # increase -t ceph mon1: 6789: / / mnt / cephfs -u name = user, secretfile = / etc / ceph / user.secret 
```

On Hat Enterprise Linux:
```
 # yum install ceph-common 
```
On Ubuntu:
```
 Add $ sudo apt-get ceph-common 
```

4.3. Integrating Ceph Filesystems Using User Space (FUSE)

Activate the Red Hat Ceph Storage 2 Tools repository on any client node. For more information, see the section on Enabling Ceph Repositories in the Red Hat Enterprise Linux Installation Guide or the section on Enabling Ceph Repositories in the Ubuntu Installation Guide.
Make sure these specialistsBoth ceph-common and ceph-fuse packages are installed on the client, whether you buy them or not.
- On Red Hat Enterprise Linux:
```
 # yum install ceph-common ceph-fuse 
```
- On Ubuntu:
```
 $ sudo apt-get ceph-fuse 
```
Copy the ceph-common ceph training file from the monitor host to access the / etc / ceph / directory on the owner host:
```
 root scp @ : /etc/ceph/ceph.conf /etc/ceph/ceph.conf 
```
Replace with part of the monitor hostname or IP address, for example:
```
 # root @ 192 scp.168.0.1: /etc/ceph/ceph.conf /etc/ceph/ceph.conf 
```

In monitoring software or on the host, create a buyer user with the correct authentication capabilities and generate the user’s keychain in a single sign-on file:

 ceph get-or-create client.Mon  'allow r' mds' allow r, reserved for rw path =  'osd' allow rw pool =  '-

Provide client name or ID, CephFS working directory and pool as the output file. For example:

 $ ceph get-or-create auth client.1 my 'allow r' mds 'allow allow r, rw path = /' osd 'allow rw pool = data' -o ceph.client.1. Key ring[Client.1]Key AQACNoZXhrzqIRAABPKHTach4x03JeNadeQ9Uw ==

Copy the client keychain from the monitor host to the entire / etc / ceph / directory on the client host:
```
 scp root @ : /ceph.client.1.keyring /etc/ceph/ceph.client.1.keyring 
```
Replace with the monitor name or Plethora IP, for example:
```
 # scp [email protected]: /ceph.client.1.keyring /etc/ceph/ceph.client.1.keyring 
```
Make sure the Ceph file configuration and keychain have the most appropriate permissions:
```
 # chmod 644 /etc/ceph/ceph.conf# chmod 644 /etc/ceph/ceph.client.1.keyring 
```
Create a mount directory after mount point. Note that the exact mount point must be in the language, which is made possible by the efficiency of the client with the path parameter:
```
 $  
```
For example mkdir:
```
 $ mkdir / mnt / mycephfs 
```

Use the ceph-fuse program to mount the Ceph filesystem:

 ceph-fuse -n client.  -m : 6789, : 6789 : 6789,

For example:

 # ceph-fuse -n client.1 -b mon1: 6789, mon2: 6789, mon3: 6789 / mnt / mycephfs

Unless you are definitely using the default user keychain name and location, it is / etc / ceph / ceph.client. .keyring , use the solution keychain to specify the path to that user keyring, for example:

 # ceph-fuse -m client.1 -m mon1: 6789, mon2: 6789, mon3: 6789 --keyring = / etc / ceph / client1.keyring Type = "disc">  To / mnt / mycephfs

 # yum install ceph-common ceph-fuse

On Ubuntu:
```
 $ sudo apt-get ceph-common ceph-fuse 
```

4.4. Permanent Integration Of Ceph Filesystems In `/ Etc / Fstab`

 # DEVICE PATH TYPE OPTIONS: : /,  ceph [name = username: : / ,, secret = secretkey |: : / secretfile =path_to_secretfile],[]

The name parameter associated with the secret or secretfile parameter was required when activating Ceph authentication.

 # DEVICE PATH TYPE OPTIONSid =  [, conf = ]  fuse.ceph _netdev,                                                                 default settings7 0

The util-linux package shipped with Red Hat Enterprise Linux 7.2 does not support mounting CephFS FUSE clients in / etc / fstab . Red Hat Enterprise Linux 7.3 will have a new version <. contains code> util-linux the bait with which potential CephFS FUSE clients are permanently installed.

4.5. Umounting Ceph File Systems

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Here’s how to unmount Ceph a large filesystem mounted as a good reliable kernel client:

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The Ceph File System (CephFS) is an ideal POSIX file system that uses a Ceph storage cluster to store data. The Ceph filesystem follows the same Ceph storage cluster course as the Ceph block device, Ceph object gateway, or librados API.

Create two pools, one for storing data and one for storing metadata: ceph osd pool write Create a Ceph filesystem: ceph fs new Make sure one or more MDBs are active in theaccording to your configuration.

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