CephFS: Difference between revisions

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=Procedure= <!--T:3-->
=Procedure= <!--T:3-->


==Request Access to Shares == <!--T:4-->
==Request access to shares == <!--T:4-->


<!--T:5-->
<!--T:5-->
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


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


<!--T:7-->
<!--T:7-->
# Create the share.
; Create the share.
#* In ''Project --> Share --> Shares'', click on ''+Create Share''.
: In <i>Project --> Share --> Shares</i>, click on <i>+Create Share</i>.
#* ''Share Name'' = enter a name that identifies your project (e.g. ''project-name-shareName'')
: <i>Share Name</i> = enter a name that identifies your project (e.g. <i>project-name-shareName</i>)
#* ''Share Protocol'' = CephFS
: <i>Share Protocol</i> = CephFS
#* ''Size'' = size you need for this share
: <i>Size</i> = size you need for this share
#* ''Share Type'' = cephfs
: <i>Share Type</i> = cephfs
#* ''Availability Zone'' = nova
: <i>Availability Zone</i> = nova
#* Do not check ''Make visible for all'', otherwise the share will be accessible by all users in all projects.
: Do not check <i>Make visible for all</i>, otherwise the share will be accessible by all users in all projects.
# Create an access rule to generate an access key.
: Click on the <i>Create</i> button.
#* In ''Project --> Share --> Shares --> Actions'' column, select ''Manage Rules'' from the dropdown menu.
[[File:Cephfs config.png|450px|thumb|left|Configuration of CephFS on Horizon GUI]]
#* Click on the ''+Add Rule'' button (right of page).
<br clear=all>
#* ''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 (e.g. ''def-project-shareName-read-write'')
# Note the share details
#* In ''Project --> Share --> Shares'', click on the name of the share.
#* In the ''Share Overview'', note the ''Path'' which you will need later.
#* Under ''Access Rules'', note the ''Access Key'' which you will need later (the access key is approximately 40 characters and ends with the ''=''; sign; if you do not see an access key, you probably didn't add an access rule of type ''cephx''.


== Configure Host == <!--T:8-->
<!--T:20-->
; Create an access rule to generate access key.
: In <i>Project --> Share --> Shares --> Actions</i> column, select <i>Manage Rules</i> from the drop-down menu.
: Click on the <i>+Add Rule</i> button (right of the page).
: <i>Access Type</i> = cephx
: <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)
: <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>.
[[File:Cephfs created.png|450px|thumb|left||Properly configured CephFS]]
<br clear=all>


<!--T:9-->
<!--T:21-->
<ol>
; Note the share details which you will need later.
<li><p>Install the required packages.</p>
: In <i>Project --> Share --> Shares</i>, click on the name of the share.
<ul>
: 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.
<li><p>Red Hat family (RHEL, CentOS, Fedora, Scientific Linux, SUSE, etc.):</p>
<ol>
<li>Install relevant repositories for access to ceph client packages:
<pre>ceph-stable (nautilus is current as of this writting)
    https://docs.ceph.com/en/nautilus/install/get-packages/
epel (sudo yum install epel-release)


<!--T:12-->
== Attach the CephFS network to your VM == <!--T:8-->
</pre></li>
 
<li>Install packages to enable the ceph client on all the instances where you plan on mounting the share:
=== On Arbutus === <!--T:22-->
<pre>libcephfs2
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]]'''.
python-cephfs
 
ceph-common
=== On SD4H/Juno === <!--T:23-->
python-ceph-argparse
On <code>SD4H/Juno</code>, you need to explicitly attach the cephFS network to the VM.
ceph-fuse (only if you intend a fuse mount)
 
</pre></li></ol>
<!--T:24-->
;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|]]
<br clear=all>
;With the [[OpenStack_command_line_clients|Openstack client]]
List the servers and select the id of the server you need to attach to the CephFS
<source lang='bash'>
$ 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 |
+--------------------------------------+--------------+--------+----------------------------------------------+--------------------------+----------+
</source>
 
<!--T:25-->
Select the ID of the VM you want to attach, will pick the first one here and run
<source lang='bash'>
$ 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 |
+--------------------------------------+--------------+--------+------------------------------------------------------------------------+--------------------------+----------+
</source>
 
<!--T:26-->
We can see that the CephFS network is attached to the first VM.
 
== VM configuration: install and configure CephFS client == <!--T:9-->
 
=== Required packages for the Red Hat family (RHEL, CentOS, Fedora, Rocky, Alma ) === <!--T:27-->
Check the available releases at [https://download.ceph.com/ https://download.ceph.com/] and look for recent <code>rpm-*</code> directories.
As of July 2024, <code>quincy</code> is the latest stable release.
The compatible distributions (distros) are listed at [https://download.ceph.com/rpm-quincy/ https://download.ceph.com/rpm-quincy/].
Here we show configuration examples for <code>Enterprise Linux 8</code> and <code>Enterprise Linux 9</code>.
 
<!--T:28-->
; Install relevant repositories for access to ceph client packages:
 
<!--T:29-->
<tabs>
<tab name="Enterprise Linux 8 - el8">
{{File
  |name=/etc/yum.repos.d/ceph.repo
  |lang="ini"
  |contents=
[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
 
<!--T:51-->
[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
 
<!--T:52-->
[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
}}
</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
 
<!--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
 
<!--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
 
 
=== Required packages for the Debian family (Debian, Ubuntu, Mint, etc.) === <!--T:34-->
You can get the repository once 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>
 
=== Configure ceph client === <!--T:35-->
 
<!--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>
<tab name="Arbutus">
{{File
  |name=/etc/ceph/ceph.conf
  |lang="ini"
  |contents=
[global]
admin socket = /var/run/ceph/$cluster-$name-$pid.asok
client reconnect stale = true
debug client = 0/2
fuse big writes = true
mon host = 10.30.201.3:6789,10.30.202.3:6789,10.30.203.3:6789
[client]
quota = true
}}
</tab>
<tab name="SD4H/Juno">
{{File
  |name=/etc/ceph/ceph.conf
  |lang="ini"
  |contents=
[global]
admin socket = /var/run/ceph/$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
}}
</tab>
</tabs>
 
<!--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.
 
<!--T:38-->
You also need to put your client name and secret in the <code>ceph.keyring</code> file
 
<!--T:39-->
{{File
  |name=/etc/ceph/ceph.keyring
  |lang="ini"
  |contents=
[client.MyCephFS-RW]
    key = <access Key>
}}
 
<!--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.
 
<!--T:42-->
;Mount the filesystem
:Create a mount point directory somewhere in your host (<code>/cephfs</code>, is used here)</li>
<source lang="bash">
mkdir /cephfs
</source>
:You can use the ceph driver to permanently mount your CephFS device by adding the following in the VM fstab
<tabs>
<tab name="Arbutus">
{{File
  |name=/etc/fstab
  |lang="txt"
  |contents=
:/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c /cephfs/ ceph name=MyCephFS-RW 0  2
}}
</tab>
<tab name="SD4H/Juno">
{{File
  |name=/etc/fstab
  |lang="txt"
  |contents=
:/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
}}
</tab>
</tabs>
 
<!--T:43-->
'''Notice''' the non-standard <code>:</code> 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.
 
<!--T:44-->
You can also do the mount directly from the command line:
<tabs>
<tab name="Arbutus">
<code>
sudo mount -t ceph :/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c /cephfs/ -o name=MyCephFS-RW
</code>
</tab>
<tab name="SD4H/Juno">
<code>
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
</code>
</tab>
</tabs>
 
<!--T:45-->
CephFS is can also be mounted directly in user space via ceph-fuse.


<!--T:13-->
<!--T:46-->
<ul>
Install the ceph-fuse lib
<li><p>Debian family (Debian, Ubuntu, Mint, etc.):</li></ul>


<!--T:14-->
<!--T:47-->
<pre>   https://docs.ceph.com/en/nautilus/install/get-packages/
<source lang="bash">
</pre></li></ul>
sudo dnf install ceph-fuse
</li>
</source>
<li><p>Configure Keys:</p>
Let the fuse mount be accessible in userspace by uncommenting  <code>user_allow_other</code> in the <code>fuse.conf</code> file.
<ul>
<li><p>Create two files in your instance, each containing the access key. This key can be found in the rule definition, or in the ''Access Rules'' section of your share definition.</p></li>
<li><p>File 1: /etc/ceph/client.fullkey.shareName (e.g. client.fullkey.def-project-shareName-read-write)</p>
<ul>
<li>contents:
<pre>[client.shareName]
    key = AccessKey
</pre></li></ul>
</li>
<li><p>File 2: /etc/ceph/client.keyonly.shareName (e.g ''client.keyonly.def-project-shareName-read-write'')</p>
<ul>
<li>contents:
<pre>AccessKey
</pre></li>
<li>This file only contains the access key.</li></ul>
</li>
<li><p>Own these files correctly to protect the key information:</p>
<ul>
<li>Each file should be own to root</li></ul>


<!--T:15-->
<!--T:48-->
<pre>sudo chown root.root filename
{{File
</pre>
  |name=/etc/fuse.conf
<ul>
  |lang="txt"
<li>Each file should be only readable by root</li></ul>
  |contents=
# mount_max = 1000
user_allow_other
}}


<!--T:16-->
<!--T:49-->
<pre>sudo chmod 600 filename
You can now mount cephFS in a user’s home:
</pre></li></ul>
<source lang="bash">
</li>
mkdir ~/my_cephfs
<li><p>Create <code>/etc/ceph/ceph.conf</code> with contents:</p>
ceph-fuse my_cephfs/ --id=MyCephFS-RW --conf=~/ceph.conf --keyring=~/ceph.keyring  --client-mountpoint=/volumes/_nogroup/f6cb8f06-f0a4-4b88-b261-f8bd6b03582c
<pre>[client]
</source>
    client quota = true
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.
    mon host = 10.30.201.3:6789,10.30.202.3:6789,10.30.203.3:6789
</pre>
<ul>
<li>Note: these are the monitors for the Arbutus cluster. If connecting to a different cluster, you will need the monitor information specific to that cluster.
<ul>
<li>You can find the monitor information in the share details for your share in the ''Path'' field.</li></ul>
</li></ul>
</li>
<li><p>Retrieve the connection information from the share page for your connection:</p>
<ul>
<li>Open up the share details by clicking the name of the share in the ''Shares'' 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 (likely under /mnt/ - e.g. /mnt/ShareName)</li>
<li>Via kernel mount using the ceph driver:
<ul>
<li>Syntax: <code>sudo mount -t ceph &lt;path information&gt; &lt;mountPoint&gt; -o name=&lt;shareKeyName&gt;, secretfile=&lt;/path/to/keyringfileOnlyFile&gt;</code></li>
<li><code>sudo mount -t ceph mon1:6789,mon2:6789,mon3:6789:/volumes/_nogroup/share_instance_id </code>
<ul>
<li>e.g <code>sudo mount -t ceph 192.168.17.13:6789,192.168.17.14:6789,192.168.17.15:6789:/volumes/_nogroup/a87b5ef3-b266-4664-a5ed-026cddfdcdb7 /mnt/WebServerShare -o name=def-project-shareName-read-write,secretfile=/etc/ceph/client.keyonly.def-project-sharename-read-write</code></li></ul>
</li></ul>
</li>
<li>Via ceph-fuse
<ul>
<li>Need to install ceph-fuse</li>
<li>Syntax: <code>sudo ceph-fuse &lt;mountPoint&gt; --id=&lt;shareKeyName&gt; --conf=&lt;pathtoCeph.conf&gt; --keyring=&lt;fullKeyringLocation&gt; --client-mountpoint=pathFromShareDetails</code>
<ul>
<li>e.g. <code>sudo ceph-fuse /mnt/WebServerShare --id=def-project-shareName-read-write --conf=/etc/ceph/ceph.conf --keyring=/etc/ceph/client.fullkey.def-project-shareName-read-write --client-mountpoint=/volumes/_nogroup/a87b5ef3-b266-4664-a5ed-026cddfdcdb7</code></li></ul>
</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:CC-Cloud]]
[[Category:Cloud]]


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Latest revision as of 18:59, 16 October 2024

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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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