Ceph Tentacle : Add or Remove Monitors2025/09/25 |
|
This is how to add or remove Monitor Daemons from existing Cluster.
|
+--------------------+ | +----------------------+
| [dlp.srv.world] |10.0.0.30 | 10.0.0.31| [www.srv.world] |
| Ceph Client +-----------+-----------+ RADOSGW |
| | | | |
+--------------------+ | +----------------------+
+----------------------------+----------------------------+
| | |
|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] | For example, Add a [node04] node for Monitor Daemon on Admin Node. |
|
# transfer public key [root@node01 ~]# ssh-copy-id node04 # if Firewalld is running, allow service [root@node01 ~]# ssh node04 "firewall-cmd --add-service=ceph-mon; firewall-cmd --runtime-to-permanent" # install required packages [root@node01 ~]# ssh node04 "dnf -y install centos-release-ceph-tentacle epel-release; dnf --enablerepo=crb -y install ceph"
# configure monitor map [root@node01 ~]# FSID=$(grep "^fsid" /etc/ceph/ceph.conf | awk {'print $NF'}) [root@node01 ~]# NODENAME="node04" [root@node01 ~]# NODEIP="10.0.0.54" [root@node01 ~]# monmaptool --add $NODENAME $NODEIP --fsid $FSID /etc/ceph/monmap monmaptool: monmap file /etc/ceph/monmap monmaptool: set fsid to 4b46d240-7b97-412e-b5b6-8c58e8d25835 monmaptool: writing epoch 0 to /etc/ceph/monmap (2 monitors) # configure Monitor Daemin [root@node01 ~]# scp /etc/ceph/ceph.conf node04:/etc/ceph/ceph.conf [root@node01 ~]# scp /etc/ceph/ceph.mon.keyring node04:/etc/ceph [root@node01 ~]# scp /etc/ceph/monmap node04:/etc/ceph [root@node01 ~]# ssh node04 "ceph-mon --cluster ceph --mkfs -i node04 --monmap /etc/ceph/monmap --keyring /etc/ceph/ceph.mon.keyring" [root@node01 ~]# ssh node04 "chown -R ceph:ceph /etc/ceph /var/lib/ceph" [root@node01 ~]# ssh node04 "ceph auth get mon. -o /etc/ceph/ceph.mon.keyring" [root@node01 ~]# ssh node04 "systemctl enable --now ceph-mon@node04" [root@node01 ~]# ssh node04 "ceph mon enable-msgr2"
ceph -s
cluster:
id: 4b46d240-7b97-412e-b5b6-8c58e8d25835
health: HEALTH_OK
services:
mon: 2 daemons, quorum node01,node04 (age 7s)
mgr: node01(active, since 37m)
osd: 3 osds: 3 up (since 7m), 3 in (since 11m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
pools: 6 pools, 161 pgs
objects: 198 objects, 454 KiB
usage: 209 MiB used, 480 GiB / 480 GiB avail
pgs: 161 active+clean
|
| [2] | On the new Monitor Daemin Node, If SELinux is enabled, change policy. |
|
[root@node04 ~]#
vi cephmon.te # create new
module cephmon 1.0;
require {
type ceph_t;
type ptmx_t;
type initrc_var_run_t;
type sudo_exec_t;
type chkpwd_exec_t;
type shadow_t;
class file { execute execute_no_trans lock getattr map open read };
class capability { audit_write sys_resource };
class process setrlimit;
class netlink_audit_socket { create nlmsg_relay };
class chr_file getattr;
}
#============= ceph_t ==============
allow ceph_t initrc_var_run_t:file { lock open read };
allow ceph_t self:capability { audit_write sys_resource };
allow ceph_t self:netlink_audit_socket { create nlmsg_relay };
allow ceph_t self:process setrlimit;
allow ceph_t sudo_exec_t:file { execute execute_no_trans open read map };
allow ceph_t ptmx_t:chr_file getattr;
allow ceph_t chkpwd_exec_t:file { execute execute_no_trans open read map };
allow ceph_t shadow_t:file { getattr open read };
checkmodule -m -M -o cephmon.mod cephmon.te [root@node04 ~]# semodule_package --outfile cephmon.pp --module cephmon.mod [root@node04 ~]# semodule -i cephmon.pp |
| [3] | To remove a Monitor Daemon from existing Cluster, run commands like follows. For example, Remove [node04] node. |
|
[root@node01 ~]# ceph -s
cluster:
id: 4b46d240-7b97-412e-b5b6-8c58e8d25835
health: HEALTH_OK
services:
mon: 2 daemons, quorum node01,node04 (age 84s)
mgr: node01(active, since 39m)
osd: 3 osds: 3 up (since 9m), 3 in (since 12m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
pools: 6 pools, 161 pgs
objects: 198 objects, 454 KiB
usage: 209 MiB used, 480 GiB / 480 GiB avail
pgs: 161 active+clean
# remove Monitor Daemon [root@node01 ~]# ceph mon remove node04
# disable monitor daemon [root@node01 ~]# ssh node04 "systemctl disable --now ceph-mon@node04.service" ceph -s
cluster:
id: 4b46d240-7b97-412e-b5b6-8c58e8d25835
health: HEALTH_OK
services:
mon: 1 daemons, quorum node01 (age 8s)
mgr: node01(active, since 39m)
osd: 3 osds: 3 up (since 9m), 3 in (since 13m)
rgw: 1 daemon active (1 hosts, 1 zones)
data:
pools: 6 pools, 161 pgs
objects: 198 objects, 454 KiB
usage: 209 MiB used, 480 GiB / 480 GiB avail
pgs: 161 active+clean
|
| Sponsored Link |
|
|