CentOS Stream 8
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Ceph Octopus : Configure Ceph Cluster #2
2021/04/01
 
Install Distributed File System Ceph to Configure Storage Cluster.
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]
[2] Configure OSD (Object Storage Device) to each Node from Admin Node.
Block devices ([/dev/sdb] on this example) are formatted for OSD, Be careful if some existing data are saved.
# if Firewalld is running on each Node, allow ports

[root@node01 ~]# for NODE in node01 node02 node03
do
    ssh $NODE "firewall-cmd --add-service=ceph --permanent; firewall-cmd --reload"
done 

# configure settings for OSD to each Node

[root@node01 ~]# for NODE in node01 node02 node03
do
    if [ ! ${NODE} = "node01" ]
    then
        scp /etc/ceph/ceph.conf ${NODE}:/etc/ceph/ceph.conf
        scp /etc/ceph/ceph.client.admin.keyring ${NODE}:/etc/ceph
        scp /var/lib/ceph/bootstrap-osd/ceph.keyring ${NODE}:/var/lib/ceph/bootstrap-osd
    fi
    ssh $NODE \
    "chown ceph. /etc/ceph/ceph.* /var/lib/ceph/bootstrap-osd/*; \
    parted --script /dev/sdb 'mklabel gpt'; \
    parted --script /dev/sdb "mkpart primary 0% 100%"; \
    ceph-volume lvm create --data /dev/sdb1"
done 

Running command: /usr/bin/ceph-authtool --gen-print-key
Running command: /usr/bin/ceph --cluster ceph --name client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring -i - osd new 4321d2ac-ba79-4947-a19f-65205c08e416
Running command: /usr/sbin/vgcreate --force --yes ceph-42ee91b6-b00c-4f52-a54b-ba03ed897365 /dev/sdb1
 stdout: Physical volume "/dev/sdb1" successfully created.
 stdout: Volume group "ceph-42ee91b6-b00c-4f52-a54b-ba03ed897365" successfully created
Running command: /usr/sbin/lvcreate --yes -l 20479 -n osd-block-4321d2ac-ba79-4947-a19f-65205c08e416 ceph-42ee91b6-b00c-4f52-a54b-ba03ed897365
 stdout: Logical volume "osd-block-4321d2ac-ba79-4947-a19f-65205c08e416" created.
Running command: /usr/bin/ceph-authtool --gen-print-key
Running command: /usr/bin/mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-0
Running command: /usr/sbin/restorecon /var/lib/ceph/osd/ceph-0
Running command: /usr/bin/chown -h ceph:ceph /dev/ceph-42ee91b6-b00c-4f52-a54b-ba03ed897365/osd-block-4321d2ac-ba79-4947-a19f-65205c08e416
Running command: /usr/bin/chown -R ceph:ceph /dev/dm-2
Running command: /usr/bin/ln -s /dev/ceph-42ee91b6-b00c-4f52-a54b-ba03ed897365/osd-block-4321d2ac-ba79-4947-a19f-65205c08e416 /var/lib/ceph/osd/ceph-0/block
Running command: /usr/bin/ceph --cluster ceph --name client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring mon getmap -o /var/lib/ceph/osd/ceph-0/activate.monmap
 stderr: got monmap epoch 2
Running command: /usr/bin/ceph-authtool /var/lib/ceph/osd/ceph-0/keyring --create-keyring --name osd.0 --add-key AQCDEGRgw8DjGhAAw40Vh0+A1rvAL4Hvh06fVQ==
 stdout: creating /var/lib/ceph/osd/ceph-0/keyring
added entity osd.0 auth(key=AQCDEGRgw8DjGhAAw40Vh0+A1rvAL4Hvh06fVQ==)
Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-0/keyring
Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-0/
Running command: /usr/bin/ceph-osd --cluster ceph --osd-objectstore bluestore --mkfs -i 0 --monmap /var/lib/ceph/osd/ceph-0/activate.monmap --keyfile - --osd-data /var/lib/ceph/osd/ceph-0/ --osd-uuid 4321d2ac-ba79-4947-a19f-65205c08e416 --setuser ceph --setgroup ceph
 stderr: 2021-03-31T15:02:44.963+0900 7f60425aef40 -1 bluestore(/var/lib/ceph/osd/ceph-0/) _read_fsid unparsable uuid
 stderr: 2021-03-31T15:02:45.554+0900 7f60425aef40 -1 freelist read_size_meta_from_db missing size meta in DB
--> ceph-volume lvm prepare successful for: /dev/sdb1
Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-0
Running command: /usr/bin/ceph-bluestore-tool --cluster=ceph prime-osd-dir --dev /dev/ceph-42ee91b6-b00c-4f52-a54b-ba03ed897365/osd-block-4321d2ac-ba79-4947-a19f-65205c08e416 --path /var/lib/ceph/osd/ceph-0 --no-mon-config
Running command: /usr/bin/ln -snf /dev/ceph-42ee91b6-b00c-4f52-a54b-ba03ed897365/osd-block-4321d2ac-ba79-4947-a19f-65205c08e416 /var/lib/ceph/osd/ceph-0/block
Running command: /usr/bin/chown -h ceph:ceph /var/lib/ceph/osd/ceph-0/block
Running command: /usr/bin/chown -R ceph:ceph /dev/dm-2
Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-0
Running command: /usr/bin/systemctl enable ceph-volume@lvm-0-4321d2ac-ba79-4947-a19f-65205c08e416
 stderr: Created symlink /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-0-4321d2ac-ba79-4947-a19f-65205c08e416.service -> /usr/lib/systemd/system/ceph-volume@.service.
Running command: /usr/bin/systemctl enable --runtime ceph-osd@0
 stderr: Created symlink /run/systemd/system/ceph-osd.target.wants/ceph-osd@0.service -> /usr/lib/systemd/system/ceph-osd@.service.
Running command: /usr/bin/systemctl start ceph-osd@0
--> ceph-volume lvm activate successful for osd ID: 0
--> ceph-volume lvm create successful for: /dev/sdb1
.....
.....

# confirm cluster status

# that's OK if [HEALTH_OK]

[root@node01 ~]#
ceph -s

  cluster:
    id:     7def6ab9-42d6-4385-af46-79ba8ccefdcd
    health: HEALTH_OK

  services:
    mon: 1 daemons, quorum node01 (age 23m)
    mgr: node01(active, since 21m)
    osd: 3 osds: 3 up (since 4m), 3 in (since 4m)

  data:
    pools:   1 pools, 1 pgs
    objects: 0 objects, 0 B
    usage:   3.0 GiB used, 237 GiB / 240 GiB avail
    pgs:     1 active+clean

# confirm OSD tree

[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

[root@node01 ~]# ceph df 
--- RAW STORAGE ---
CLASS  SIZE     AVAIL    USED     RAW USED  %RAW USED
hdd    240 GiB  237 GiB  7.6 MiB   3.0 GiB       1.25
TOTAL  240 GiB  237 GiB  7.6 MiB   3.0 GiB       1.25

--- POOLS ---
POOL                   ID  PGS  STORED  OBJECTS  USED  %USED  MAX AVAIL
device_health_metrics   1    1     0 B        0   0 B      0     75 GiB

[root@node01 ~]# ceph osd df 
ID  CLASS  WEIGHT   REWEIGHT  SIZE     RAW USE  DATA     OMAP  META   AVAIL    %USE  VAR   PGS  STATUS
 0    hdd  0.07809   1.00000   80 GiB  1.0 GiB  2.5 MiB   0 B  1 GiB   79 GiB  1.25  1.00    1      up
 1    hdd  0.07809   1.00000   80 GiB  1.0 GiB  2.5 MiB   0 B  1 GiB   79 GiB  1.25  1.00    1      up
 2    hdd  0.07809   1.00000   80 GiB  1.0 GiB  2.4 MiB   0 B  1 GiB   79 GiB  1.25  1.00    1      up
                       TOTAL  240 GiB  3.0 GiB  7.4 MiB   0 B  3 GiB  237 GiB  1.25
MIN/MAX VAR: 1.00/1.00  STDDEV: 0
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