puppet-prod/doc/ceph

managing ceph

Always refer back to the official documentation at https://docs.ceph.com/en/latest

adding new cephfs

• create a erasure code profile which will allow you to customise the raid level
  • raid5 with 3 disks? k=2,m=1
  • raid5 with 6 disks? k=5,m=1
  • raid6 with 4 disks? k=2,m=2, etc
• create osd pool using custom profile for data
• create osd pool using default replicated profile for metadata
• enable ec_overwrites for the data pool
• create the ceph fs volume using data/metadata pools
• set ceph fs settings
  • specify minimum number of metadata servers (mds)
  • set fs to be for bulk data
  • set mds fast failover with standby reply

    sudo ceph osd erasure-code-profile set ec_4_1 k=4 m=1
    sudo ceph osd pool create media_data 128 erasure ec_4_1
    sudo ceph osd pool create media_metadata 32 replicated_rule
    sudo ceph osd pool set media_data allow_ec_overwrites true
    sudo ceph osd pool set media_data bulk true
    sudo ceph fs new mediafs media_metadata media_data --force
    sudo ceph fs set mediafs allow_standby_replay true
    sudo ceph fs set mediafs max_mds 2

creating authentication tokens

• this will create a client keyring named media
• this client will have the following capabilities:
  • mon: read
  • mds:
    • read /
    • read/write /media
    • read/write /common
  • osd: read/write to cephfs_data pool

    sudo ceph auth get-or-create client.media \
      mon 'allow r' \
      mds 'allow r path=/, allow rw path=/media, allow rw path=/common' \
      osd 'allow rw pool=cephfs_data'

list the authentication tokens and permissions

ceph auth ls

change the capabilities of a token

this will overwrite the current capabilities of a given client.user

sudo ceph auth caps client.media \
  mon 'allow r' \
  mds 'allow rw path=/' \
  osd 'allow rw pool=media_data'