Create new pool and place new osd¶

• Table of contents
• Create new pool and place new osd
  • 1. create a new pool
    • check a current pool
    • create a new pool
  • 2. create a crush rule for new pool
    • check a current rule
    • create a new crush rule(copy from existing rule)
  • 3. assign a crush rule to new pool
  • 4. update a key infro to access a new pool
    • check the current key
  • 5. set ceph application enable
  • * remove pool and crush rule

1. create a new pool¶

manual
https://docs.ceph.com/docs/jewel/rados/operations/pools/#create-a-pool

check a current pool¶

ceph osd lspools

create a new pool¶

ceph osd pool create {pool-name} {pg-num} [{pgp-num}] [replicated] \
     [crush-ruleset-name] [expected-num-objects]

osds are 5~10 --> pg_num 512
osds are 10~50 --> pg_num 4096
osds are more than 50 --> need to calculation(pgcalc)

ex) ceph osd pool create xruk-ssd-pool 128 128

2. create a crush rule for new pool¶

manual
https://docs.ceph.com/docs/master/rados/operations/crush-map/#creating-a-rule-for-a-replicated-pool

check a current rule¶

ceph osd crush rule ls

create a new crush rule(copy from existing rule)¶

ceph osd crush rule create-replicated <rule-name> <root> <failure-domain> <class>

ex) ceph osd crush rule create-replicated xruk-ssd-rule default host xruk-ssd

3. assign a crush rule to new pool¶

manual
https://docs.ceph.com/docs/master/rados/operations/crush-map/#device-classes

- assgin a new crush-rule to a new pool

ceph osd pool set <pool-name> crush_rule <rule-name>

ex) ceph osd pool set xruk-ssd-pool crush_rule xruk-ssd-rule

4. update a key infro to access a new pool¶

manual
https://docs.ceph.com/en/latest/rados/operations/user-management/

check the current key¶

- check the list of key

ceph auth ls

- get info about the opennbula's key

ceph auth get client.libvirt

- update a key's info

ceph auth caps USERTYPE.USERID {daemon} 'allow [r|w|x|*|...] [pool={pool-name}] [namespace={namespace-name}]' [{daemon} 'allow [r|w|x|*|...] [pool={pool-name}] [namespace={namespace-name}]']

mon 'profile {name}' 
osd 'profile {name} [pool={pool-name} [namespace={namespace-name}]]'

ex) ceph auth caps client.libvirt mon 'profile rbd' osd 'profile rbd pool=xruk-ssd-pool, profile rbd pool=hdd, profile rbd pool=ssd'

- verify a updated key

ceph auth get client.libvirt

5. set ceph application enable¶

ceph osd pool application enable <pool-name> <app-name>', where <app-name> is 'cephfs', 'rbd', 'rgw', or freeform for custom applications

ex)
~# ceph osd pool application enable xruk-ssd-pool rbd
enabled application 'rbd' on pool 'xruk-ssd-pool'

* remove pool and crush rule¶

https://docs.ceph.com/en/latest/rados/operations/pools/?highlight=ceph%20osd%20pool#delete-a-pool
https://docs.ceph.com/en/latest/rados/operations/crush-map/#device-classes

- check current pool's rule

ex) ceph osd pool get ssd-pool crush_rule

- To remove a pool the mon_allow_pool_delete flag must be set to true in the Monitor’s configuration. Otherwise they will refuse to remove a pool.

ex) ceph tell mon.\* injectargs '--mon-allow-pool-delete=true'

- remove pool

ex) ceph osd pool delete ssd-pool ssd-pool --yes-i-really-really-mean-it

- disavle monitor flag

ex) ceph tell mon.\* injectargs '--mon-allow-pool-delete=false'

- check pool list

ceph osd lspools

- remove crush rule

ex) ceph osd crush rule rm ssd-rule

- check rule list

ceph osd crush rule ls