CephFS: Difference between revisions

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If you do not already have a quota for the service, you will need to request this through [mailto:cloud@tech.alliancecan.ca cloud@tech.alliancecan.ca]. In your request please provide the following:
If you do not already have a quota for the service, you will need to request this through [mailto:cloud@tech.alliancecan.ca cloud@tech.alliancecan.ca]. In your request please provide the following:
* OpenStack project name
* OpenStack project name
* amount of quota required in GB
* amount of quota required (in GB)
* number of shares required
* number of shares required


== Openstack Configuration: Create CephFS share == <!--T:6-->
== OpenStack configuration: Create a CephFS share == <!--T:6-->


<!--T:7-->
<!--T:7-->
[[File:Cephfs config.png|thumb|Configuration of CephFS on Horizon Gui]]
; Create the share.
[[File:Cephfs created.png|thumb|Porperly configured CephFS]]
: In <i>Project --> Share --> Shares</i>, click on <i>+Create Share</i>.
# Create the share.
: <i>Share Name</i> = enter a name that identifies your project (e.g. <i>project-name-shareName</i>)
#* In <i>Project --> Share --> Shares</i>, click on <i>+Create Share</i>.
: <i>Share Protocol</i> = CephFS
#* <i>Share Name</i> = enter a name that identifies your project (e.g. <i>project-name-shareName</i>)
: <i>Size</i> = size you need for this share
#* <i>Share Protocol</i> = CephFS
: <i>Share Type</i> = cephfs
#* <i>Size</i> = size you need for this share
: <i>Availability Zone</i> = nova
#* <i>Share Type</i> = cephfs
: Do not check <i>Make visible for all</i>, otherwise the share will be accessible by all users in all projects.
#* <i>Availability Zone</i> = nova
: Click on the <i>Create</i> button.
#* Do not check <i>Make visible for all</i>, otherwise the share will be accessible by all users in all projects.
[[File:Cephfs config.png|450px|thumb|left|Configuration of CephFS on Horizon GUI]]
#* Click on the <i>Create</i> button.
<br clear=all>
# Create an access rule to generate an access key.
 
#* In <i>Project --> Share --> Shares --> Actions</i> column, select <i>Manage Rules</i> from the drop-down menu.  
<!--T:20-->
#* Click on the <i>+Add Rule</i> button (right of page).
; Create an access rule to generate access key.
#* <i>Access Type</i> = cephx
: In <i>Project --> Share --> Shares --> Actions</i> column, select <i>Manage Rules</i> from the drop-down menu.  
#* <i>Access Level</i> = select <i>read-write</i> or <i>read-only</i> (you can create multiple rules for either access level if required)
: Click on the <i>+Add Rule</i> button (right of the page).
#* <i>Access To</i> = select a key name that describes the key, this name is important, it will be used in the cephfs clien config on the VM, we will use <i>MyCephFS-RW</i> on this page.
: <i>Access Type</i> = cephx
# Note the share details which you will need later.
: <i>Access Level</i> = select <i>read-write</i> or <i>read-only</i> (you can create multiple rules for either access level if required)
#* In <i>Project --> Share --> Shares</i>, click on the name of the share.
: <i>Access To</i> = select a key name that describes the key. This name is important because it will be used in the cephfs client configuration on the VM; on this page, we use <i>MyCephFS-RW</i>.
#* In the <i>Share Overview</i>, note the three element circled in red in the "Properly configured" image: <i>Path</i>, wich will be used in the  mount command on the VM, the <i>Access Rules</i>, which will be the client name and the <i>Access Key</i> that will let the VM's client connnect.
[[File:Cephfs created.png|450px|thumb|left||Properly configured CephFS]]
<br clear=all>
 
<!--T:21-->
; Note the share details which you will need later.
: In <i>Project --> Share --> Shares</i>, click on the name of the share.
: In the <i>Share Overview</i>, note the three elements circled in red in the "Properly configured" image: <i>Path</i>, which will be used in the  mount command on the VM, the <i>Access Rules</i>, which will be the client name and the <i>Access Key</i> that will let the VM's client connect.


== Attatch the CephFS network to your vm == <!--T:6-->
== Attach the CephFS network to your VM == <!--T:8-->


=== On Arbutus ===
=== On Arbutus === <!--T:22-->
On <code>Arbutus</code> the cephFS network is already exposed to your VM, there is nothing to do here, '''go the the next section'''.
On <code>Arbutus</code>, the cephFS network is already exposed to your VM; there is nothing to do here, '''[[CephFS#VM_configuration:_install_and_configure_CephFS_client|go to the VM configuration section]]'''.


=== On SD4H/Juno ===
=== On SD4H/Juno === <!--T:23-->
On <code>SD4H/Juno</code> the cephFS network, there you need to explicitely attatch the network to the VM.
On <code>SD4H/Juno</code>, you need to explicitly attach the cephFS network to the VM.


==== With the Web Gui ====
<!--T:24-->
For each Vm you need to attach, select <i>Instance --> Action --> Attach interface</i>  select the CephFS-Network, leave the Fixed IP Address box empty.
;With the Web Gui
For each VM you need to attach, select <i>Instance --> Action --> Attach interface</i>  select the CephFS-Network, leave the <i>Fixed IP Address</i> box empty.
[[File:Select CephFS Network.png|750px|thumb|left|]]
[[File:Select CephFS Network.png|750px|thumb|left|]]
<br clear=all>
<br clear=all>
==== With the [[OpenStack_command_line_clients|Openstack client]] ====
;With the [[OpenStack_command_line_clients|Openstack client]]
List the server select the id of the server you need to attach to the CephFS  
List the servers and select the id of the server you need to attach to the CephFS  
<source lang='bash'>
<source lang='bash'>
$ openstack  server list  
$ openstack  server list  
Line 68: Line 75:
</source>
</source>


Select The ID od the VM you want to attach, will pick the first one here and run
<!--T:25-->
Select the ID of the VM you want to attach, will pick the first one here and run
<source lang='bash'>
<source lang='bash'>
$ openstack  server add network 1b2a3c21-c1b4-42b8-9016-d96fc8406e04 CephFS-Network
$ openstack  server add network 1b2a3c21-c1b4-42b8-9016-d96fc8406e04 CephFS-Network
$ openstack --os-cloud test server list  
$ openstack  server list  
+--------------------------------------+--------------+--------+---------------------------------------------------------------------+--------------------------+----------+
+--------------------------------------+--------------+--------+---------------------------------------------------------------------+--------------------------+----------+
| ID                                  | Name        | Status | Networks                                                            | Image                    | Flavor  |
| ID                                  | Name        | Status | Networks                                                            | Image                    | Flavor  |
Line 81: Line 89:
</source>
</source>


<!--T:26-->
We can see that the CephFS network is attached to the first VM.
We can see that the CephFS network is attached to the first VM.


== VM configuration: install and configure CephFS client == <!--T:8-->
== VM configuration: install and configure CephFS client == <!--T:9-->


<ol>
=== Required packages for the Red Hat family (RHEL, CentOS, Fedora, Rocky, Alma ) === <!--T:27-->
<li><p>Install the required packages.</p>
Check the available releases at [https://download.ceph.com/ https://download.ceph.com/] and look for recent <code>rpm-*</code> directories.
<ul>
As of July 2024, <code>quincy</code> is the latest stable release.  
<li><p>Red Hat family (RHEL, CentOS, Fedora, Rocky, Alma ):</p>
The compatible distributions (distros) are listed at [https://download.ceph.com/rpm-quincy/ https://download.ceph.com/rpm-quincy/].
<ol>
Here we show configuration examples for <code>Enterprise Linux 8</code> and <code>Enterprise Linux 9</code>.
Check the available releases here https://download.ceph.com/ and look for recent <code>rpm-*</code> directories, quincy is the right/latest stable release at the time of this writing. The compatible distro are listed here
https://download.ceph.com/rpm-quincy/, we will show the full installation for <code>el8</code>.


<li>Install relevant repositories for access to ceph client packages:
<!--T:28-->
; Install relevant repositories for access to ceph client packages:


<!--T:29-->
<tabs>
<tab name="Enterprise Linux 8 - el8">
{{File
{{File
   |name=/etc/yum.repos.d/ceph.repo
   |name=/etc/yum.repos.d/ceph.repo
Line 107: Line 118:
gpgkey=https://download.ceph.com/keys/release.asc
gpgkey=https://download.ceph.com/keys/release.asc


<!--T:51-->
[Ceph-noarch]
[Ceph-noarch]
name=Ceph noarch packages
name=Ceph noarch packages
Line 115: Line 127:
gpgkey=https://download.ceph.com/keys/release.asc
gpgkey=https://download.ceph.com/keys/release.asc


<!--T:52-->
[ceph-source]
[ceph-source]
name=Ceph source packages
name=Ceph source packages
Line 123: Line 136:
gpgkey=https://download.ceph.com/keys/release.asc
gpgkey=https://download.ceph.com/keys/release.asc
}}
}}
</tab>
<tab name="Enterprise Linux 9 - el9">
{{File
  |name=/etc/yum.repos.d/ceph.repo
  |lang="ini"
  |contents=
[Ceph]
name=Ceph packages for $basearch
baseurl=http://download.ceph.com/rpm-quincy/el9/$basearch
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc


The epel repo also need to be in place
<!--T:53-->
[Ceph-noarch]
name=Ceph noarch packages
baseurl=http://download.ceph.com/rpm-quincy/el9/noarch
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc
 
<!--T:54-->
[ceph-source]
name=Ceph source packages
baseurl=http://download.ceph.com/rpm-quincy/el9/SRPMS
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc
}}
</tab>
</tabs>
 
<!--T:32-->
The epel repo also needs to be in place
  sudo dnf install epel-release
  sudo dnf install epel-release


You can now install the ceph lib, cephfs client and other denpendencies:
<!--T:33-->
You can now install the ceph lib, cephfs client and other dependencies:
  sudo dnf install -y libcephfs2 python3-cephfs ceph-common python3-ceph-argparse
  sudo dnf install -y libcephfs2 python3-cephfs ceph-common python3-ceph-argparse




<ul>
=== Required packages for the Debian family (Debian, Ubuntu, Mint, etc.) === <!--T:34-->
<li><p>Debian family (Debian, Ubuntu, Mint, etc.):</p></li></ul>
You can get the repository once you have figured out your distro <code>{codename}</code> with <code>lsb_release -sc</code>
You can get the repository one you have figured out your distro <code>{codename}</code> with <code>lsb_release -sc</code>
<source lang='bash'>
sudo apt-add-repository 'deb https://download.ceph.com/debian-quincy/ {codename} main'
</source>
 
<!--T:50-->
You can now install the ceph lib, cephfs client and other dependencies:
<source lang='bash'>
sudo apt-get install -y libcephfs2 python3-cephfs ceph-common python3-ceph-argparse
</source>


<pre>    sudo apt-add-repository 'deb https://download.ceph.com/debian-quincy/ {codename} main'
=== Configure ceph client === <!--T:35-->
</pre></li></ul>
</li>
<li><p>Configure ceph client:</p>


Once the client is install, you can create a <code>ceph.conf</code> file, note the different Mon host for the different cloud.  
<!--T:36-->
Once the client is installed, you can create a <code>ceph.conf</code> file.
Note the different <code>mon host</code> for the different cloud.  
<tabs>
<tabs>
<tab name="Arbutus">
<tab name="Arbutus">
Line 174: Line 230:
</tabs>
</tabs>


You can find the monitor information in the share details <i>Path</i> field that will be use to mount the volume. If the value from the web page is different than what is seen here, it means that the wiki page is out of date.  
<!--T:37-->
You can find the monitor information in the share details <i>Path</i> field that will be used to mount the volume. If the value of the web page is different than what is seen here, it means that the wiki page is out of date.  


You aslo need to put your cient name and secret in the <code>ceph.keyring</code> file  
<!--T:38-->
You also need to put your client name and secret in the <code>ceph.keyring</code> file  


<!--T:39-->
{{File
{{File
   |name=/etc/ceph/ceph.keyring
   |name=/etc/ceph/ceph.keyring
Line 186: Line 245:
}}
}}


Again, the acces key and client name (here MyCephFS-RW) are found under access rules on your project web page, hereL Project --> Share --> Shares, click on the name of the share.
<!--T:40-->
Again, the access key and client name (here MyCephFS-RW) are found under the access rules on your project web page.
Look for <i>Project --> Share --> Shares</i>, then click on the name of the share.


<!--T:41-->
; Retrieve the connection information from the share page for your connection:
: Open up the share details by clicking on the name of the share in the <i>Shares</i> page.
: Copy the entire path of the share to mount the filesystem.


</li>
<!--T:42-->
<li><p>Retrieve the connection information from the share page for your connection:</p>
;Mount the filesystem
<ul>
:Create a mount point directory somewhere in your host (<code>/cephfs</code>, is used here)</li>
<li>Open up the share details by clicking the name of the share in the <i>Shares</i> page.</li>
<li>Copy the entire path of the share for mounting the filesystem.</li></ul>
</li>
<li><p>Mount the filesystem</p>
<ul>
<li>Create a mount point directory somewhere in your host (<code>/cephfs</code>, is used here)</li>
<source lang="bash">
<source lang="bash">
  mkdir /cephfs
  mkdir /cephfs
</source>
</source>
<li>Via kernel mount using the ceph driver. You can do a permanent mount by adding the followin in the VM fstab
:You can use the ceph driver to permanently mount your CephFS device by adding the following in the VM fstab
<tabs>
<tabs>
<tab name="Arbutus">
<tab name="Arbutus">
Line 221: Line 280:
</tabs>
</tabs>


Note
<!--T:43-->
<li> There is a non-standar/funky <code>:</code> before the device path, it is not a typo!  
'''Notice''' the non-standard <code>:</code> before the device path. It is not a typo!  
The mount options are different on different systems.  
The mount options are different on different systems.  
The namespace option is requires for SD4H/Juno while other option are performance tweaks.
The namespace option is required for SD4H/Juno, while other options are performance tweaks.


<li>It can also be done from the command line:</li>
<!--T:44-->
You can also do the mount directly from the command line:
<tabs>
<tabs>
<tab name="Arbutus">
<tab name="Arbutus">
Line 240: Line 300:
</tabs>
</tabs>


<li>Or via ceph-fuse if the file system needs to be mounted in user space
<!--T:45-->
CephFS is can also be mounted directly in user space via ceph-fuse.


<li>Install ceph-fuse</li>
<!--T:46-->
Install the ceph-fuse lib


<!--T:47-->
<source lang="bash">
<source lang="bash">
sudo dnf install ceph-fuse
sudo dnf install ceph-fuse
</source>
</source>
<li>Let the fuse mount be accessible in userspace by uncommenting  <code>user_allow_other</code> in the <code>fuse.conf</code> file
Let the fuse mount be accessible in userspace by uncommenting  <code>user_allow_other</code> in the <code>fuse.conf</code> file.


<!--T:48-->
{{File
{{File
   |name=/etc/fstab
   |name=/etc/fuse.conf
   |lang="txt"
   |lang="txt"
   |contents=
   |contents=
Line 257: Line 321:
}}
}}


<li> You can now mount cephFS in a user home:
<!--T:49-->
You can now mount cephFS in a user’s home:
<source lang="bash">
<source lang="bash">
mkdir ~/my_cephfs
mkdir ~/my_cephfs
ceph-fuse my_cephfs/ --id=MyCephFS-RW --conf=~/ceph.conf --keyring=~/ceph.keyring  --client-mountpoint=/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c
ceph-fuse my_cephfs/ --id=MyCephFS-RW --conf=~/ceph.conf --keyring=~/ceph.keyring  --client-mountpoint=/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c
</source>
</source>
Note that the client name is here the <code>--id</code>. The <code>ceph.conf</code> and <code>ceph.keyring</code> filed are exactly the same than for the ceph kernel mount, but now they can be store in your favorite location.
Note that the client name is here the <code>--id</code>. The <code>ceph.conf</code> and <code>ceph.keyring</code> content are exactly the same as for the ceph kernel mount.
 
</li></ul>
</li></ul>
</li></ol>


=Notes= <!--T:17-->
=Notes= <!--T:10-->


<!--T:18-->
<!--T:11-->
* A particular share can have more than one user key provisioned for it.
A particular share can have more than one user key provisioned for it. This allows a more granular access to the filesystem, for example, if you needed some hosts to only access the filesystem in a read-only capacity. If you have multiple keys for a share, you can add the extra keys to your host and modify the above mounting procedure. This service is not available to hosts outside of the OpenStack cluster.
** This allows a more granular access to the filesystem, for example if you needed some hosts to only access the filesystem in a read-only capacity.
** If you have multiple keys for a share, you can add the extra keys to your host and modify the above mounting procedure.
* This service is not available to hosts outside of the OpenStack cluster.


<!--T:19-->
<!--T:12-->
[[Category:Cloud]]
[[Category:Cloud]]


</translate>
</translate>

Latest revision as of 18:59, 16 October 2024

Other languages:


CephFS provides a common filesystem that can be shared amongst multiple OpenStack VM hosts. Access to the service is granted via requests to cloud@tech.alliancecan.ca.

This is a fairly technical procedure that assumes basic Linux skills for creating/editing files, setting permissions, and creating mount points. For assistance in setting up this service, write to cloud@tech.alliancecan.ca.

Procedure

Request access to shares

If you do not already have a quota for the service, you will need to request this through cloud@tech.alliancecan.ca. In your request please provide the following:

  • OpenStack project name
  • amount of quota required (in GB)
  • number of shares required

OpenStack configuration: Create a CephFS share

Create the share.
In Project --> Share --> Shares, click on +Create Share.
Share Name = enter a name that identifies your project (e.g. project-name-shareName)
Share Protocol = CephFS
Size = size you need for this share
Share Type = cephfs
Availability Zone = nova
Do not check Make visible for all, otherwise the share will be accessible by all users in all projects.
Click on the Create button.
Configuration of CephFS on Horizon GUI


Create an access rule to generate access key.
In Project --> Share --> Shares --> Actions column, select Manage Rules from the drop-down menu.
Click on the +Add Rule button (right of the page).
Access Type = cephx
Access Level = select read-write or read-only (you can create multiple rules for either access level if required)
Access To = select a key name that describes the key. This name is important because it will be used in the cephfs client configuration on the VM; on this page, we use MyCephFS-RW.
Properly configured CephFS


Note the share details which you will need later.
In Project --> Share --> Shares, click on the name of the share.
In the Share Overview, note the three elements circled in red in the "Properly configured" image: Path, which will be used in the mount command on the VM, the Access Rules, which will be the client name and the Access Key that will let the VM's client connect.

Attach the CephFS network to your VM

On Arbutus

On Arbutus, the cephFS network is already exposed to your VM; there is nothing to do here, go to the VM configuration section.

On SD4H/Juno

On SD4H/Juno, you need to explicitly attach the cephFS network to the VM.

With the Web Gui

For each VM you need to attach, select Instance --> Action --> Attach interface select the CephFS-Network, leave the Fixed IP Address box empty.

Select CephFS Network.png


With the Openstack client

List the servers and select the id of the server you need to attach to the CephFS 

$ openstack  server list 
+--------------------------------------+--------------+--------+-------------------------------------------+--------------------------+----------+
| ID                                   | Name         | Status | Networks                                  | Image                    | Flavor   |
+--------------------------------------+--------------+--------+-------------------------------------------+--------------------------+----------+
| 1b2a3c21-c1b4-42b8-9016-d96fc8406e04 | prune-dtn1   | ACTIVE | test_network=172.16.1.86, 198.168.189.3   | N/A (booted from volume) | ha4-15gb |
| 0c6df8ea-9d6a-43a9-8f8b-85eb64ca882b | prune-mgmt1  | ACTIVE | test_network=172.16.1.64                  | N/A (booted from volume) | ha4-15gb |
| 2b7ebdfa-ee58-4919-bd12-647a382ec9f6 | prune-login1 | ACTIVE | test_network=172.16.1.111, 198.168.189.82 | N/A (booted from volume) | ha4-15gb |
+--------------------------------------+--------------+--------+----------------------------------------------+--------------------------+----------+

Select the ID of the VM you want to attach, will pick the first one here and run 

$ openstack  server add network 1b2a3c21-c1b4-42b8-9016-d96fc8406e04 CephFS-Network
$ openstack  server list 
+--------------------------------------+--------------+--------+---------------------------------------------------------------------+--------------------------+----------+
| ID                                   | Name         | Status | Networks                                                            | Image                    | Flavor   |
+--------------------------------------+--------------+--------+---------------------------------------------------------------------+--------------------------+----------+
| 1b2a3c21-c1b4-42b8-9016-d96fc8406e04 | prune-dtn1   | ACTIVE | CephFS-Network=10.65.20.71; test_network=172.16.1.86, 198.168.189.3 | N/A (booted from volume) | ha4-15gb |
| 0c6df8ea-9d6a-43a9-8f8b-85eb64ca882b | prune-mgmt1  | ACTIVE | test_network=172.16.1.64                                            | N/A (booted from volume) | ha4-15gb |
| 2b7ebdfa-ee58-4919-bd12-647a382ec9f6 | prune-login1 | ACTIVE | test_network=172.16.1.111, 198.168.189.82                           | N/A (booted from volume) | ha4-15gb |
+--------------------------------------+--------------+--------+------------------------------------------------------------------------+--------------------------+----------+

We can see that the CephFS network is attached to the first VM.

VM configuration: install and configure CephFS client

Required packages for the Red Hat family (RHEL, CentOS, Fedora, Rocky, Alma )

Check the available releases at https://download.ceph.com/ and look for recent rpm-* directories. As of July 2024, quincy is the latest stable release. The compatible distributions (distros) are listed at https://download.ceph.com/rpm-quincy/. Here we show configuration examples for Enterprise Linux 8 and Enterprise Linux 9.

Install relevant repositories for access to ceph client packages
File : /etc/yum.repos.d/ceph.repo

[Ceph]
name=Ceph packages for $basearch
baseurl=http://download.ceph.com/rpm-quincy/el8/$basearch
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc

[Ceph-noarch]
name=Ceph noarch packages
baseurl=http://download.ceph.com/rpm-quincy/el8/noarch
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc

[ceph-source]
name=Ceph source packages
baseurl=http://download.ceph.com/rpm-quincy/el8/SRPMS
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc


File : /etc/yum.repos.d/ceph.repo

[Ceph]
name=Ceph packages for $basearch
baseurl=http://download.ceph.com/rpm-quincy/el9/$basearch
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc

[Ceph-noarch]
name=Ceph noarch packages
baseurl=http://download.ceph.com/rpm-quincy/el9/noarch
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc

[ceph-source]
name=Ceph source packages
baseurl=http://download.ceph.com/rpm-quincy/el9/SRPMS
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc


The epel repo also needs to be in place 

sudo dnf install epel-release

You can now install the ceph lib, cephfs client and other dependencies: 

sudo dnf install -y libcephfs2 python3-cephfs ceph-common python3-ceph-argparse


Required packages for the Debian family (Debian, Ubuntu, Mint, etc.)

You can get the repository once you have figured out your distro {codename} with lsb_release -sc 

sudo apt-add-repository 'deb https://download.ceph.com/debian-quincy/ {codename} main'

You can now install the ceph lib, cephfs client and other dependencies: 

 sudo apt-get install -y libcephfs2 python3-cephfs ceph-common python3-ceph-argparse

Configure ceph client

Once the client is installed, you can create a ceph.conf file. Note the different mon host for the different cloud.

File : /etc/ceph/ceph.conf

[global]
admin socket = /var/run/ceph/$cluster-$name-$pid.asok
client reconnect stale = true
debug client = 0/2
fuse big writes = true
mon host = 10.30.201.3:6789,10.30.202.3:6789,10.30.203.3:6789
[client]
quota = true


File : /etc/ceph/ceph.conf

[global]
admin socket = /var/run/ceph/$cluster-$name-$pid.asok
client reconnect stale = true
debug client = 0/2
fuse big writes = true
mon host = 10.65.0.10:6789,10.65.0.12:6789,10.65.0.11:6789
[client]
quota = true


You can find the monitor information in the share details Path field that will be used to mount the volume. If the value of the web page is different than what is seen here, it means that the wiki page is out of date.

You also need to put your client name and secret in the ceph.keyring file


File : /etc/ceph/ceph.keyring

[client.MyCephFS-RW]
    key = <access Key>


Again, the access key and client name (here MyCephFS-RW) are found under the access rules on your project web page. Look for Project --> Share --> Shares, then click on the name of the share.

Retrieve the connection information from the share page for your connection
Open up the share details by clicking on the name of the share in the Shares page.
Copy the entire path of the share to mount the filesystem.
Mount the filesystem
Create a mount point directory somewhere in your host (/cephfs, is used here)
 mkdir /cephfs
You can use the ceph driver to permanently mount your CephFS device by adding the following in the VM fstab
File : /etc/fstab

:/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c /cephfs/ ceph name=MyCephFS-RW 0  2


File : /etc/fstab

:/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c /cephfs/ ceph name=MyCephFS-RW,mds_namespace=cephfs_4_2,x-systemd.device-timeout=30,x-systemd.mount-timeout=30,noatime,_netdev,rw 0  2


Notice the non-standard : before the device path. It is not a typo! The mount options are different on different systems. The namespace option is required for SD4H/Juno, while other options are performance tweaks.

You can also do the mount directly from the command line:

sudo mount -t ceph :/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c /cephfs/ -o name=MyCephFS-RW

sudo mount -t ceph :/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c /cephfs/ -o name=MyCephFS-RW,mds_namespace=cephfs_4_2,x-systemd.device-timeout=30,x-systemd.mount-timeout=30,noatime,_netdev,rw

CephFS is can also be mounted directly in user space via ceph-fuse.

Install the ceph-fuse lib 

sudo dnf install ceph-fuse

Let the fuse mount be accessible in userspace by uncommenting user_allow_other in the fuse.conf file.


File : /etc/fuse.conf

# mount_max = 1000
user_allow_other


You can now mount cephFS in a user’s home: 

mkdir ~/my_cephfs
ceph-fuse my_cephfs/ --id=MyCephFS-RW --conf=~/ceph.conf --keyring=~/ceph.keyring   --client-mountpoint=/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c

Note that the client name is here the --id. The ceph.conf and ceph.keyring content are exactly the same as for the ceph kernel mount.

Notes

A particular share can have more than one user key provisioned for it. This allows a more granular access to the filesystem, for example, if you needed some hosts to only access the filesystem in a read-only capacity. If you have multiple keys for a share, you can add the extra keys to your host and modify the above mounting procedure. This service is not available to hosts outside of the OpenStack cluster.

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