Ceph Pacific : Cephadm #2 Configure Cluster2021/07/08

Configure Ceph Cluster with [Cephadm] that is a Ceph Cluster Deploy tool.

For example on here, Configure Ceph Cluster with 3 Nodes like follows.
Furthermore, each Storage Node has a free block device to use on Ceph Nodes.
(use [/dev/sdb] on this example)

                                         |
            +----------------------------+----------------------------+
            |                            |                            |
            |10.0.0.51                   |10.0.0.52                   |10.0.0.53 
+-----------+-----------+    +-----------+-----------+    +-----------+-----------+
|   [node01.srv.world]  |    |   [node02.srv.world]  |    |   [node03.srv.world]  |
|     Object Storage    +----+     Object Storage    +----+     Object Storage    |
|     Monitor Daemon    |    |                       |    |                       |
|     Manager Daemon    |    |                       |    |                       |
+-----------------------+    +-----------------------+    +-----------------------+

[1]	Configure basic Cluster settings with [Cephadm], refer to here.
[2]	To add Nodes to Cluster, run like follows. For example, add [node02], [node03].

# transfer SSH public key

[root@node01 ~]#

ssh-copy-id -f -i /etc/ceph/ceph.pub root@node02


Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@node02'"
and check to make sure that only the key(s) you wanted were added.

[root@node01 ~]#

ssh-copy-id -f -i /etc/ceph/ceph.pub root@node03


Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@node03'"
and check to make sure that only the key(s) you wanted were added.

# add target Nodes to Cluster

[root@node01 ~]#

ceph orch host add node02

Inferring fsid 6df4185a-dfb3-11eb-adb7-525400238cef
Inferring config /var/lib/ceph/6df4185a-dfb3-11eb-adb7-525400238cef/mon.node01/config
Using recent ceph image docker.io/ceph/ceph@sha256:54e95ae1e11404157d7b329d0bef866ebbb214b195a009e87aae4eba9d282949
Added host 'node02'

[root@node01 ~]#

ceph orch host add node03

Inferring fsid 6df4185a-dfb3-11eb-adb7-525400238cef
Inferring config /var/lib/ceph/6df4185a-dfb3-11eb-adb7-525400238cef/mon.node01/config
Using recent ceph image docker.io/ceph/ceph@sha256:54e95ae1e11404157d7b329d0bef866ebbb214b195a009e87aae4eba9d282949
Added host 'node03'

[root@node01 ~]#

ceph orch host ls

Inferring fsid 6df4185a-dfb3-11eb-adb7-525400238cef
Inferring config /var/lib/ceph/6df4185a-dfb3-11eb-adb7-525400238cef/mon.node01/config
Using recent ceph image docker.io/ceph/ceph@sha256:54e95ae1e11404157d7b329d0bef866ebbb214b195a009e87aae4eba9d282949
HOST    ADDR    LABELS  STATUS
node01  node01
node02  node02
node03  node03

[3]	To configure OSD, run like follows. For example, configure [node01], [node02], [node03].

# list available devices

# possible to set if [AVAIL = True]

[root@node01 ~]#

ceph orch device ls

Hostname  Path      Type  Serial  Size   Health   Ident  Fault  Available
node01    /dev/sdb  hdd           85.8G  Unknown  N/A    N/A    Yes
node02    /dev/sdb  hdd           85.8G  Unknown  N/A    N/A    Yes
node03    /dev/sdb  hdd           85.8G  Unknown  N/A    N/A    Yes

# configure OSD

[root@node01 ~]#

ceph orch daemon add osd node01:/dev/sdb

Created osd(s) 0 on host 'node01'
[root@node01 ~]#

ceph orch daemon add osd node02:/dev/sdb

Created osd(s) 1 on host 'node02'
[root@node01 ~]#

ceph orch daemon add osd node03:/dev/sdb

Created osd(s) 2 on host 'node03'

# after few minutes, status turns to [HEALTH_OK]

[root@node01 ~]#

ceph -s

  cluster:
    id:     6df4185a-dfb3-11eb-adb7-525400238cef
    health: HEALTH_OK

  services:
    mon: 3 daemons, quorum node01,node02,node03 (age 4m)
    mgr: node01.ftzoaf(active, since 23m), standbys: node02.ypaecy
    osd: 3 osds: 3 up (since 22s), 3 in (since 45s)

  data:
    pools:   1 pools, 1 pgs
    objects: 0 objects, 0 B
    usage:   15 MiB used, 240 GiB / 240 GiB avail
    pgs:     1 active+clean

[4]	To remove OSD, run like follows.

[root@node01 ~]#

ceph osd tree

ID  CLASS  WEIGHT   TYPE NAME        STATUS  REWEIGHT  PRI-AFF
-1         0.23428  root default
-3         0.07809      host node01
 0    hdd  0.07809          osd.0        up   1.00000  1.00000
-5         0.07809      host node02
 1    hdd  0.07809          osd.1        up   1.00000  1.00000
-7         0.07809      host node03
 2    hdd  0.07809          osd.2        up   1.00000  1.00000

# for example, remove OSD ID [2]

[root@node01 ~]#

ceph orch osd rm 2

Scheduled OSD(s) for removal

# show removal status

# completes if no entries are shown

# takes many times

[root@node01 ~]#

ceph orch osd rm status

OSD_ID  HOST    STATE     PG_COUNT  REPLACE  FORCE  DRAIN_STARTED_AT
2       node03  draining  1         False    False  2021-07-08 06:38:42.239748

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