Ceph Octopus : Configure Cluster #12020/08/31

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]	Generate SSH key-pair on [Monitor Daemon] Node (call it Admin Node on here) and set it to each Node. Configure key-pair with no-passphrase as [root] account on here. If you use a common account, it also needs to configure Sudo. If you set passphrase to SSH kay-pair, it also needs to set SSH Agent.

root@node01:~#

ssh-keygen

Generating public/private rsa key pair.
Enter file in which to save the key (/home/ubuntu/.ssh/id_rsa):
Created directory '/home/ubuntu/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/ubuntu/.ssh/id_rsa
Your public key has been saved in /home/ubuntu/.ssh/id_rsa.pub
The key fingerprint is:
SHA256:jKbVHHWzfLv+IO4vBI12U2/6GhLjo7/zOupYtbhfmNc ubuntu@node01.srv.world
The key's randomart image is:
.....
.....

root@node01:~#

vi ~/.ssh/config

# create new (define each Node and SSH user)

Host node01
    Hostname node01.srv.world
    User root
Host node02
    Hostname node02.srv.world
    User root
Host node03
    Hostname node03.srv.world
    User root

root@node01:~#

chmod 600 ~/.ssh/config

# transfer public key

root@node01:~#

ssh-copy-id node01

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/ubuntu/.ssh/id_rsa.pub"
The authenticity of host 'node01.srv.world (10.0.0.51)' can't be established.
ECDSA key fingerprint is SHA256:0TfV//D7JSem+SOtN5rksAvfE0bXlFw3dWX+w5ri8i8.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
ubuntu@node01.srv.world's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'node01'"
and check to make sure that only the key(s) you wanted were added.

root@node01:~#

ssh-copy-id node02

root@node01:~#

ssh-copy-id node03

[2]	Install Ceph to each Node from Admin Node.

root@node01:~# for NODE in node01 node02 node03
do
    ssh $NODE "apt update; apt -y install ceph"
done

[3]	Configure [Monitor Daemon], [Manager Daemon] on Admin Node.

root@node01:~#

uuidgen

72840c24-3a82-4e28-be87-cf9f905918fb

# create new config

# file name ⇒ (any Cluster Name).conf

# set Cluster Name [ceph] (default) on this example ⇒ [ceph.conf]

root@node01:~#

vi /etc/ceph/ceph.conf

[global]
# specify cluster network for monitoring
cluster network = 10.0.0.0/24
# specify public network
public network = 10.0.0.0/24
# specify UUID genarated above
fsid = 72840c24-3a82-4e28-be87-cf9f905918fb
# specify IP address of Monitor Daemon
mon host = 10.0.0.51
# specify Hostname of Monitor Daemon
mon initial members = node01
osd pool default crush rule = -1

# mon.(Node name)
[mon.node01]
# specify Hostname of Monitor Daemon
host = node01
# specify IP address of Monitor Daemon
mon addr = 10.0.0.51
# allow to delete pools
mon allow pool delete = true

# generate secret key for Cluster monitoring

root@node01:~#

ceph-authtool --create-keyring /etc/ceph/ceph.mon.keyring --gen-key -n mon. --cap mon 'allow *'

creating /etc/ceph/ceph.mon.keyring

# generate secret key for Cluster admin

root@node01:~#

ceph-authtool --create-keyring /etc/ceph/ceph.client.admin.keyring --gen-key -n client.admin --cap mon 'allow *' --cap osd 'allow *' --cap mds 'allow *' --cap mgr 'allow *'

creating /etc/ceph/ceph.client.admin.keyring

# generate key for bootstrap

root@node01:~#

ceph-authtool --create-keyring /var/lib/ceph/bootstrap-osd/ceph.keyring --gen-key -n client.bootstrap-osd --cap mon 'profile bootstrap-osd' --cap mgr 'allow r'

creating /var/lib/ceph/bootstrap-osd/ceph.keyring

# import generated key

root@node01:~#

ceph-authtool /etc/ceph/ceph.mon.keyring --import-keyring /etc/ceph/ceph.client.admin.keyring

importing contents of /etc/ceph/ceph.client.admin.keyring into /etc/ceph/ceph.mon.keyring
root@node01:~#

ceph-authtool /etc/ceph/ceph.mon.keyring --import-keyring /var/lib/ceph/bootstrap-osd/ceph.keyring

importing contents of /var/lib/ceph/bootstrap-osd/ceph.keyring into /etc/ceph/ceph.mon.keyring

# generate monitor map

root@node01:~#

FSID=$(grep "^fsid" /etc/ceph/ceph.conf | awk {'print $NF'})

root@node01:~#

NODENAME=$(grep "^mon initial" /etc/ceph/ceph.conf | awk {'print $NF'})

root@node01:~#

NODEIP=$(grep "^mon host" /etc/ceph/ceph.conf | awk {'print $NF'})

root@node01:~#

monmaptool --create --add $NODENAME $NODEIP --fsid $FSID /etc/ceph/monmap

monmaptool: monmap file /etc/ceph/monmap
monmaptool: set fsid to 72840c24-3a82-4e28-be87-cf9f905918fb
monmaptool: writing epoch 0 to /etc/ceph/monmap (1 monitors)

# create a directory for Monitor Daemon

# directory name ⇒ (Cluster Name)-(Node Name)

root@node01:~#

mkdir /var/lib/ceph/mon/ceph-node01

# assosiate key and monmap to Monitor Daemon

# --cluster (Cluster Name)

root@node01:~#

ceph-mon --cluster ceph --mkfs -i $NODENAME --monmap /etc/ceph/monmap --keyring /etc/ceph/ceph.mon.keyring

root@node01:~#

chown ceph. /etc/ceph/ceph.*

root@node01:~#

chown -R ceph. /var/lib/ceph/mon/ceph-node01 /var/lib/ceph/bootstrap-osd

root@node01:~#

systemctl enable --now ceph-mon@$NODENAME

# enable Messenger v2 Protocol

root@node01:~#

ceph mon enable-msgr2

# enable Placement Groups auto scale module

root@node01:~#

ceph mgr module enable pg_autoscaler

# create a directory for Manager Daemon

# directory name ⇒ (Cluster Name)-(Node Name)

root@node01:~#

mkdir /var/lib/ceph/mgr/ceph-node01

# create auth key

root@node01:~#

ceph auth get-or-create mgr.$NODENAME mon 'allow profile mgr' osd 'allow *' mds 'allow *'


[mgr.node01]
        key = AQC3IEZfESetLhAA/rnFCLkpvopkARxyLKLJAA==

root@node01:~#

ceph auth get-or-create mgr.node01 | tee /etc/ceph/ceph.mgr.admin.keyring

root@node01:~#

cp /etc/ceph/ceph.mgr.admin.keyring /var/lib/ceph/mgr/ceph-node01/keyring

root@node01:~#

chown ceph. /etc/ceph/ceph.mgr.admin.keyring

root@node01:~#

chown -R ceph. /var/lib/ceph/mgr/ceph-node01

root@node01:~#

systemctl enable --now ceph-mgr@$NODENAME

[4]	Confirm Cluster status. That's OK if [Monitor Daemon] and [Manager Daemon] are enabled like follows. For OSD (Object Storage Device), Configure them on next section, so it's no ploblem if [HEALTH_WARN] at this point.

root@node01:~#

ceph -s

  cluster:
    id:     72840c24-3a82-4e28-be87-cf9f905918fb
    health: HEALTH_WARN
            OSD count 0 < osd_pool_default_size 3

  services:
    mon: 1 daemons, quorum node01 (age 2m)
    mgr: node01(active, since 23s)
    osd: 0 osds: 0 up, 0 in

  data:
    pools:   1 pools, 1 pgs
    objects: 0 objects, 0 B
    usage:   0 B used, 0 B / 0 B avail
    pgs:     100.000% pgs unknown
             1 unknown

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