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88 lines
2.3 KiB
Markdown
88 lines
2.3 KiB
Markdown
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# Capabilities of an user required for a ceph-csi in an Ceph cluster
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Ceph uses the term capabilities to describe authorizing an authenticated user
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to exercise the functionality of the monitors, OSDs and metadata servers.
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Capabilities can also restrict access to data within a pool or pool namespace.
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A Ceph administrative user sets a user's capabilities when creating or
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updating a user. In secret we have user id and user key and in order to
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perform certain actions, the user needs to have some specific capabilities.
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Hence, those capabilities are documented below.
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## RBD
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We have provisioner, controller expand and node stage secrets in storage class.
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For the provisioner and controller expand stage secret in storageclass, the
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user needs to have the below mentioned ceph capabilities.
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```text
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"mon", "profile rbd",
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"mgr", "allow rw",
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"osd", "profile rbd"
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```
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And for the node stage secret in storageclass, the user needs to have the
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below mentioned ceph capabilities.
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```text
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"mon", "profile rbd",
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"osd", "profile rbd",
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"mgr", "allow rw"
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```
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## CephFS
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Similarly in CephFS, for the provisioner and controller expand stage secret in
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storageclass, the user needs to have the below mentioned ceph capabilities.
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```text
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"mon", "allow r",
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"mgr", "allow rw",
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"osd", "allow rw tag cephfs metadata=*"
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```
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And for node stage secret in storageclass, the user needs to have
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the below mentioned ceph capabilities.
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```text
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"mon", "allow r",
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"mgr", "allow rw",
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"osd", "allow rw tag cephfs *=*",
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"mds", "allow rw"
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```
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To get more insights on capabilities of cephfs you can refer
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[this document](https://ceph.readthedocs.io/en/latest/cephfs/client-auth/)
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## Command to a create user with required capabilities
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`kubernetes` in the below commands represents an user which is subjected
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to change as per your requirement.
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### create user for RBD
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The command for provisioner and node stage secret for rbd will be same as
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they have similiar capability requirements.
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```bash
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ceph auth get-or-create client.kubernetes \
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mon 'profile rbd' \
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osd 'profile rbd' \
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mgr 'allow rw'
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```
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### create user for CephFS
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```bash
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ceph auth get-or-create client.kubernetes \
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mon 'allow r' \
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osd 'allow rw tag cephfs metadata=*' \
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mgr 'allow rw'
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```
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```bash
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ceph auth get-or-create client.kubernetes \
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mon 'allow r' \
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osd 'allow rw tag cephfs *=*' \
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mgr 'allow rw' \
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mds 'allow rw'
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```
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