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Ceph Quincy : Cephadm #1 Configure Cluster
2022/06/15
 
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]
[Cephadm] uses Python 3 to configure Nodes,
so Install Python 3 on all Nodes, refer to here [1].
[2] [Cephadm] deploys Container based Ceph Cluster,
so Install Podman on all Nodes.
[root@node01 ~]#
dnf -y install podman

[3] Install [Cephadm] on a Node.
(it's [node01] on this example)
[root@node01 ~]#
dnf -y install centos-release-ceph-quincy epel-release
[root@node01 ~]#
dnf -y install cephadm
[4] Bootstrap new Ceph Cluster.
[root@node01 ~]#
mkdir -p /etc/ceph

[root@node01 ~]#
cephadm bootstrap --mon-ip 10.0.0.51 --allow-fqdn-hostname

Verifying podman|docker is present...
Verifying lvm2 is present...
Verifying time synchronization is in place...
Unit chronyd.service is enabled and running
Repeating the final host check...
podman (/usr/bin/podman) version 4.1.0 is present
systemctl is present
lvcreate is present
Unit chronyd.service is enabled and running
Host looks OK
Cluster fsid: 5bde1018-ec3b-11ec-9cfd-5254006ea317
Verifying IP 10.0.0.51 port 3300 ...
Verifying IP 10.0.0.51 port 6789 ...
Mon IP `10.0.0.51` is in CIDR network `10.0.0.0/24`
- internal network (--cluster-network) has not been provided, OSD replication will default to the public_network
Pulling container image quay.io/ceph/ceph:v17...

.....
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Enabling firewalld port 8443/tcp in current zone...
Ceph Dashboard is now available at:

             URL: https://node01.srv.world:8443/
            User: admin
        Password: h2t6k5uj20

Enabling client.admin keyring and conf on hosts with "admin" label
Enabling autotune for osd_memory_target
You can access the Ceph CLI with:

        sudo /usr/sbin/cephadm shell --fsid 5bde1018-ec3b-11ec-9cfd-5254006ea317 -c /etc/ceph/ceph.conf -k /etc/ceph/ceph.client.admin.keyring

Please consider enabling telemetry to help improve Ceph:

        ceph telemetry on

For more information see:

        https://docs.ceph.com/docs/master/mgr/telemetry/

Bootstrap complete.

# enable Ceph Cli

[root@node01 ~]#
alias ceph='cephadm shell -- ceph'

[root@node01 ~]#
echo "alias ceph='cephadm shell -- ceph'" >> ~/.bash_profile
[root@node01 ~]#
ceph -v

Inferring fsid 5bde1018-ec3b-11ec-9cfd-5254006ea317
Using recent ceph image quay.io/ceph/ceph@sha256:12a0a4f43413fd97a14a3d47a3451b2d2df50020835bb93db666209f3f77617a
ceph version 17.2.0 (43e2e60a7559d3f46c9d53f1ca875fd499a1e35e) quincy (stable)

# OK for [HEALTH_WARN] because OSDs are not added yet

[root@node01 ~]#
ceph -s

Inferring fsid 5bde1018-ec3b-11ec-9cfd-5254006ea317
Using recent ceph image quay.io/ceph/ceph@sha256:12a0a4f43413fd97a14a3d47a3451b2d2df50020835bb93db666209f3f77617a
  cluster:
    id:     5bde1018-ec3b-11ec-9cfd-5254006ea317
    health: HEALTH_WARN
            OSD count 0 < osd_pool_default_size 3

  services:
    mon: 1 daemons, quorum node01.srv.world (age 5m)
    mgr: node01.srv.world.ujqdmo(active, since 3m)
    osd: 0 osds: 0 up, 0 in

  data:
    pools:   0 pools, 0 pgs
    objects: 0 objects, 0 B
    usage:   0 B used, 0 B / 0 B avail
    pgs:

# containers are running for each service

[root@node01 ~]#
podman ps

CONTAINER ID  IMAGE                                                                                      COMMAND               CREATED        STATUS            PORTS       NAMES
41fd2e6dbb8b  quay.io/ceph/ceph:v17                                                                      -n mon.node01.srv...  6 minutes ago  Up 6 minutes ago              ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317-mon-node01-srv-world
c5f620f424ed  quay.io/ceph/ceph:v17                                                                      -n mgr.node01.srv...  6 minutes ago  Up 6 minutes ago              ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317-mgr-node01-srv-world-ujqdmo
d5c29b494578  quay.io/ceph/ceph@sha256:12a0a4f43413fd97a14a3d47a3451b2d2df50020835bb93db666209f3f77617a  -n client.crash.n...  5 minutes ago  Up 5 minutes ago              ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317-crash-node01
a8abedebb75b  quay.io/prometheus/node-exporter:v1.3.1                                                    --no-collector.ti...  4 minutes ago  Up 4 minutes ago              ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317-node-exporter-node01
501a250346b8  quay.io/prometheus/prometheus:v2.33.4                                                      --config.file=/et...  4 minutes ago  Up 4 minutes ago              ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317-prometheus-node01
3079863fbb8e  quay.io/prometheus/alertmanager:v0.23.0                                                    --cluster.listen-...  4 minutes ago  Up 4 minutes ago              ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317-alertmanager-node01
848c0c1a1750  quay.io/ceph/ceph-grafana:8.3.5                                                            /bin/bash             4 minutes ago  Up 4 minutes ago              ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317-grafana-node01

# systemd service for each containers

[root@node01 ~]#
systemctl status ceph-* --no-pager

*  ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317@node-exporter.node01.service - Ceph node-exporter.node01 for 5bde1018-ec3b-11ec-9cfd-5254006ea317
     Loaded: loaded (/etc/systemd/system/ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317@.service; enabled; vendor preset: disabled)
     Active: active (running) since Wed 2022-06-15 08:42:27 JST; 5min ago
   Main PID: 7199 (conmon)
      Tasks: 14 (limit: 100441)
     Memory: 42.9M
        CPU: 2.753s
     CGroup: /system.slice/system-ceph\x2d5bde1018\x2dec3b\x2d11ec\x2d9cfd\x2d5254006ea317.slice/ceph-5bde1018-ec3b-11ec-9cfd-5254006ea317@node-exporter.node01.service
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