Kubernetes/SAN-Storage

Ceph

Configure access to ceph cluster

# Ubuntu 20.04
sudo apt install ceph-common

# Config file
cat > ~/.ceph/ceph.conf <<EOF
[global]
mon_host = XXXXXXX
keyring = /home/myuser/.ceph/ceph.client.admin.keyring # requires full absolute path
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
EOF

cat > ~/.ceph/ceph.client.admin.keyring <<EOF
[client.admin]
    key = XXXXXXXXXXXX==
EOF

# Test
ceph -c ~/.ceph/ceph.conf status 
  cluster:
    id:     aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeeee
    health: HEALTH_OK
 
  services:
    mon: 3 daemons, quorum dc1ceph11-2222,dc2ceph21-3333,dc3ceph31-4444 (age 4h)
    mgr: dc1ceph11-2222.dddddd(active, since 51m), standbys: dc2ceph21-3333.eeeeee
    mds: devcephfs:1 {0=devcephfs.dc3ceph31-4444.nmngty=up:active} 2 up:standby
    osd: 20 osds: 19 up (since 4d), 19 in (since 4d)
    rgw: 1 daemon active (admin)
 
  task status:
    scrub status:
        mds.devcephfs.dc3ceph31-4444.nmngty: idle
 
  data:
    pools:   22 pools, 449 pgs
    objects: 10.77M objects, 25 TiB
    usage:   54 TiB used, 85 TiB / 139 TiB avail
    pgs:     447 active+clean
             2   active+clean+scrubbing+deep
 
  io:
    client:   27 MiB/s rd, 5.6 MiB/s wr, 3.88k op/s rd, 191 op/s wr

# Aliases
alias ceph="ceph -c ~/.ceph/ceph.conf"
alias rbd="rbd -c ~/.ceph/ceph.conf"

Operations

# List block device images
rbd ls {poolname} -c ~/.ceph/ceph.conf 
kubernetes-dynamic-pvc-aaa9e0ff-14d9-479e-a425-aaaaaaaaaaaa
kubernetes-dynamic-pvc-aaa194fb-cdc3-4cb4-85e9-aaaaaaaaaaaa
myapp-postgresql-pv-0
myapp-postgresql-pv-1
otheapp-pg-data-0-volume

# Create a block device image
rbd create {image-name} --size {megabytes} --pool {pool-name}
rbd create dev-prometheus-data-0-vol --size 3072 --pool DEV_block # 3Gb

rbd info --image dev-prometheus-data-0-vol --pool DEV_block -c ~/.ceph/ceph.conf 
rbd image 'dev-prometheus-data-0-vol':
	size 3 GiB in 768 objects
	order 22 (4 MiB objects)
	snapshot_count: 0
	id: 0f582d6be65aaa
	block_name_prefix: rbd_data.0f582d6be65aaa
	format: 2
	features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
	op_features: 
	flags: 
	create_timestamp: Tue Nov 11 13:30:53 2021
	access_timestamp: Tue Nov 11 13:30:53 2021
	modify_timestamp: Tue Nov 11 13:30:53 2021

# Resize the image
rbd resize --image dev-prometheus-data-0-vol --size 4096 --pool DEV_block -c ~/.ceph/ceph.conf
Resizing image: 100% complete...done.