Single Host Ceph Server

yum install -y python3 podman chrony lvm2 wget 
wget -O /root/cephadm https://github.com/ceph/ceph/raw/octopus/src/cephadm/cephadm
chmod +x /root/cephadm

./cephadm add-repo --release octopus
./cephadm install

mkdir -p /etc/ceph

Bootstrap monitor med egen IP

cephadm bootstrap --mon-ip 192.168.2.206   

Installer basic ceph tools

cephadm add-repo --release octopus
cephadm install ceph-common
cephadm install ceph 

Opret OSD'er med alle diske (få lige specifik kommando fra Hoerup)

ceph orch apply osd --all-available-devices
ceph status

Lav ny regel der bruger failure domain på OSD (istedet for 3 hosts)

ceph osd crush rule create-replicated repl1 default osd
ceph osd pool ls
ceph osd pool set device_health_metrics crush_rule repl1

EC stuff, her med 4+1

ceph osd pool create rbdmeta replicated repl1
ceph osd erasure-code-profile get default
ceph osd erasure-code-profile set ec41 k=4 m=1 crush-failure-domain=osd
ceph osd pool create rbddata erasure ec41

Hint at denne pool skal bruges til block storage

ceph osd pool application enable rbddata rbd
ceph osd pool application enable rbdmeta rbd

Tillad EC blok overwrites

ceph osd pool set rbddata allow_ec_overwrites true

rbd create --size 40G --data-pool rbddata rbdmeta/ectestimage1
rbd ls rbdmeta

Mapper et rbd image ind som blockdevice

rbd map rbdmeta/ectestimage1

Husk at rette /etc/ceph/rbdmap f.eks.

rbdmeta/ectestimage1    id=admin,keyring=/etc/ceph/ceph.client.admin.keyring

systemctl enable rbdmap.service

Mount and shit

mkfs.xfs /dev/rbd0 
mkdir /storage
mount -t xfs /dev/rbd0 /storage/
df -h /storage/

Filesystem Size Used Avail Use% Mounted on /dev/rbd0 40G 319M 40G 1% /storage

1. 1. /etc/fstab

/dev/rbd0       /storage/       xfs     defaults,_netdev        0       0

1. 1. HERFRA

Clean shutdown / reboot ? ceph logs ? Scrubbing ? Overvågning / prometheus ?

1. 1. https://docs.ceph.com/en/latest/cephadm/install/
   2. https://medium.com/@balderscape/setting-up-a-virtual-single-node-ceph-storage-cluster-d86d6a6c658e
   3. https://linoxide.com/linux-how-to/hwto-configure-single-node-ceph-cluster/

--- Diverse, rod == Diverse ceph dashboard ac-user-create <username> <password> administrator

// Zap disk for re-use ceph-volume lvm zap /dev/sdX eller dd if=/dev/zero of=/dev/vdc bs=1M count=10

== Cloud Ceph URL: https://217.61.236.225:8443/ User: admin Password: 6x52bzvkad =< Admin9000

INFO:cephadm:You can access the Ceph CLI with:

sudo /usr/sbin/cephadm shell --fsid 1e57f65a-0d17-11eb-8201-00163ef9d22a -c /etc/ceph/ceph.conf -k /etc/ceph/ceph.client.admin.keyring

INFO:cephadm:Please consider enabling telemetry to help improve Ceph:

ceph telemetry on