23 Feb
2021
23 Feb
'21
12:09 p.m.
Hi Everyone,
Let me apologise upfront:
If this isn't the correct List to post to
If this has been answered already (& I've missed it in my searching)
If this has ended up double posted
If I've in any way given (or about to give) offence to anyone
I really need some help.
I'm trying to get a simple single host Pilot/Test Cluster up and running. I'm
using CentOS 8 (fully updated), and Ceph-Octopus (latest version from the Ceph Repo). I
have both ceph-mon and ceph-mgr working/running (although ceph-mge keeps stopping/crashing
after about 1-3 hours or so - but that's another issue), and my first osd (and only
osd at this point) *appears* to be working, but when I issue the command 'systemctl
start ceph-osd@0' the ceph-osd daemon won't spin up and thus when I issue
'ceph -s' the result says the 'osd: 1 osds: 0 up, 0 in'.
I've gone through the relevant logs but I can't seem to find the issue.
I'm doing this as a Manual Install because I want to actually *learn* what's going
on during the install/etc. I know I can use cephadmin (in a production environment), but
as I said, I'm trying to learn how everything "fits together".
I've read and re-read the official Ceph Documentation and followed the following
steps/commands to get Ceph installed and running:
Ran the following commands:
su -
useradd -d /home/ceph -m ceph -p <password>
mkdir /home/ceph/.ssh
Added a public SSH Key to /home/ceph/.ssh/authorized_keys.
Ran the following commands:
chmod 600 /home/ceph/.ssh/*
chown ceph:ceph -R /home/ceph/.ssh
Added the ceph.repo details to /etc/yum.repos.d/ceph.repo (as per the Ceph
Documentation).
Ran the following command:
dnf -y install qemu-kvm qemu-guest-agent libvirt gdisk ceph
Created the /etc/ceph/ceph.conf file (see listing below).
Ran the following commands:
ceph-authtool --create-keyring /etc/ceph/ceph.mon.keyring --gen-key -n mon. --cap mon
'allow *'
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 *'
ceph-authtool --create-keyring /var/lib/ceph/bootstrap-osd/keyring --gen-key -n
client.bootstrap-osd --cap mon 'profile bootstrap-osd' --cap mgr 'allow
r'
ceph-authtool /etc/ceph/ceph.mon.keyring --import-keyring
/etc/ceph/ceph.client.admin.keyring
ceph-authtool /etc/ceph/ceph.mon.keyring --import-keyring
/var/lib/ceph/bootstrap-osd/keyring
chown -R ceph:ceph /etc/ceph/
chown -R ceph:ceph /var/lib/ceph/
monmaptool --create --add ceph01 192.168.0.10 --fsid 98e84f97-031f-4958-bd54-22305f6bc738
/etc/ceph/monmap
mkdir /var/lib/ceph/mon/ceph-ceph01
chown -R ceph:ceph /var/lib/ceph
sudo -u ceph ceph-mon --mkfs -i ceph01 --monmap /etc/ceph/monmap --keyring
/etc/ceph/ceph.mon.keyring
firewall-cmd --add-service=http --permanent
firewall-cmd --add-service=ceph --permanent
firewall-cmd --add-service=ceph-mon --permanent
firewall-cmd --reload
chmod -R 750 /var/lib/ceph/
systemctl start ceph-mon@ceph01
ceph mon enable-msgr2
mkdir /var/lib/ceph/mgr/ceph-ceph01
chown ceph:ceph /var/lib/ceph/mgr/ceph-ceph01
ceph auth get-or-create mgr.ceph01 mon 'allow profile mgr' mds 'allow *'
osd 'allow *' -o /var/lib/ceph/mgr/ceph-ceph01/keyring
ceph-mgr -i ceph01
Fdisked 3 hdds (sdb, sdc, sdd) as GPT partitions.
Ran the following commands:
mkfs.xfs /dev/sdb1
mkfs.xfs /dev/sdc1
mkfs.xfs /dev/sdd1
mkdir -p /var/lib/ceph/osd/ceph-{0,1,2}
chown -R ceph:ceph /var/lib/ceph/osd
mount /dev/sdb1 /var/lib/ceph/osd/ceph-0
mount /dev/sdc1 /var/lib/ceph/osd/ceph-1
mount /dev/sdd1 /var/lib/ceph/osd/ceph-2
So, at this point everything is working, although 'ceph -s' does give a Health
Warning about not having the required number of osds (as per the /etc/ceph/ceph.conf
file).
Here is what I did to create and (fail to) run my first osd (osd.0):
Ran the following commands:
sudo -u ceph ceph osd new $(uuidgen)
sudo -u ceph ceph auth get-or-create osd.0 osd 'allow *' mon 'allow profile
osd' mgr 'allow profile osd' -o /var/lib/ceph/osd/ceph-0/keyring
sudo -u ceph ceph-osd -i 0 --mkfs
ceph osd crush add 0 2 host=ceph01
systemctl start ceph-osd@0
The osd shows up when I issue the command 'ceph osd ls'.
The key shows up when I issue the command 'ceph auth ls'.
But as I said above, when I issue the command 'ceph -s' it shows 'osd: 1 osds:
0 up, 0 in'.
And when I look at the systemctl status for ceph-osd@0 it simply said it failed with
'exit code'.
The /etc/ceph/ceph.conf listing:
[global]
auth_client_required = cephx
auth_cluster_required = cephx
auth_service_required = cephx
fsid = 98e84f97-031f-4958-bd54-22305f6bc738
mon_host = ceph01
public_network = 192.168.0.0/24
[mgr]
mgr_initial_modules = dashboard alerts balancer restful status
[mgr.ceph01]
log_file = /var/log/ceph/ceph-mgr.ceph01.log
[mon]
mon_initial_members = ceph01
mon_data_size_warn = 8589934592
mon_allow_pool_delete = true
[mon.ceph01]
host = ceph01
mon_addr = 192.168.0.10
log_file = /var/log/ceph/ceph-mon.ceph01.log
[osd]
allow_ec_overwrites = true
osd_crush_chooseleaf_type = 1
osd_journal_size = 10240
osd_pool_default_min_size = 2
osd_pool_default_pg_num = 128
osd_pool_default_pgp_num = 128
osd_pool_default_size = 3
osd_scrub_auto_repair = true
osd_scrub_begin_hour = 3
osd_scrub_end_hour = 11
pg_autoscale_mode = on
[osd.0]
host = ceph01
log_file = /var/log/ceph/ceph-osd.0.log
[osd.1]
host = ceph01
log_file = /var/log/ceph/ceph-osd.1.log
[osd.2]
host = ceph01
log_file = /var/log/ceph/ceph-osd.2.log
So, could someone please point out to me where I'm going wrong - I know its got to be
something super-simple, but this has been driving me mad for over a week now.
Thanks in advance
Dulux-Oz