Ceph Nautilus : Configure Ceph Cluster #12021/03/31 |
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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)
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+----------------------------+----------------------------+
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|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 | | | | |
+-----------------------+ +-----------------------+ +-----------------------+
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| [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. |
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[root@node01 ~]# ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): Created directory '/root/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: SHA256:cFNKujKBUJZnuJFlnQJvdbfQQpYq+JCigVl1gsX0DJY root@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 root@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 "dnf -y install centos-release-ceph-nautilus; dnf -y install ceph"
done
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| [3] | Configure [Monitor Daemon], [Manager Daemon] on Admin Node. |
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[root@node01 ~]#
uuidgen ea021e0d-d3ac-45b0-b4b6-c1174aa3966b # 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 = ea021e0d-d3ac-45b0-b4b6-c1174aa3966b # 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 ea021e0d-d3ac-45b0-b4b6-c1174aa3966b 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 --force
# 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.$NODENAME mon 'allow profile mgr' osd 'allow *' mds 'allow *'
[mgr.node01]
key = AQCaxWNghWOyMBAAxKkUECOrrp6LcF1zg0Yt1w==
[root@node01 ~]# ceph auth get-or-create mgr.node01 > /etc/ceph/ceph.mgr.admin.keyring [root@node01 ~]# cp /etc/ceph/ceph.mgr.admin.keyring /var/lib/ceph/mgr/ceph-node01/keyring [root@node01 ~]# chown ceph. /etc/ceph/ceph.mgr.admin.keyring [root@node01 ~]# chown -R ceph. /var/lib/ceph/mgr/ceph-node01 [root@node01 ~]# systemctl enable --now ceph-mgr@$NODENAME |
| [4] | On Admin Node, If Firewalld is running, allow service ports. |
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[root@node01 ~]# firewall-cmd --add-service=ceph-mon --permanent success [root@node01 ~]# firewall-cmd --reload success |
| [5] | 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 problem if [HEALTH_WARN] at this point. |
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[root@node01 ~]# ceph -s
cluster:
id: ea021e0d-d3ac-45b0-b4b6-c1174aa3966b
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 3m)
mgr: node01(active, since 20s)
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:
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