How to set up a cluster with CephAdm

hii.. what happen if admin1 is crash and need to reinstall from scratch?

Thank you for talking us through this setup. While this was helpful, it was hard for me to understand and follow along. I think the primary reason was you explained “how” but very little of “what” you were doing or “why”.

is there no automated way to install ceph - say via ansible ?

What hardware did you use for your Ceph Cluster? Rasperries?

Hey Daniel, if I already have a couple ceph clusters running, is it feasible to install cephadm on top of them just as a visualization tool? I already have graphs so I don't need that necessarily, and I don't need all the actual administration it does, but I do like its dashboard

hello Daniel
Thanks for this detailed video.
Did you ever tried migrating an OSD from one node to another node without backfilling or reallocation of data so that the device can be automatically recognized by the ceph cluster on another node or is there a way to do that?

For me not listing the devices. I only added 1 hosts. Now have 2 hosts in total. But unable to add OSD its not listing devices as in this video.

Hello Daniel,

First, I would like to thank you for your great content..
I have faced an issue with cephadm being unable to bring some osds up after host reboot...
My ceph cluster version is pacific 16.2.10 deployed on ubuntu 20.04 LTS servers with docker version 20.10.12..
I tried restarting/redeploying the osds using the dashboard service and also restarting their service with systemctl..
After 6 hours of trying, i couldn't bring them up. So, I deleted/recreated them to get health_ok again..
I suspect that there is a permission error with ceph user to manage the docker containers..
This is my current ceph user permissions on /etc/passwd..
ceph:x:64045:64045:Ceph storage service:/var/lib/ceph:/usr/sbin/nologin
I searched on it and some folks refer to change it to
ceph:x:167:167:Ceph storage service:/var/lib/ceph:/usr/sbin/nologin
Do you recommend that?

Regards <3

when I am runing cephadm boootstrap cmd getting error "Verifying IP 192.x.x.x port 3300 ...
ERROR: [Errno 99] Cannot assign requested address. Please help

after node2 reboot.. 1 osd under node2 cant up. status is IN.. but how to bring back to UP?
systemctl status ceph-osd@0 not working..

Hello Daniel, great Cephadm video. Can I ask you one question - we want to install Ceph PoS on bare metal servers HPE Synergy. We have the HW configuration ready - we have 3 servers HPE Synergy 480 Gen10 Compute Module (each server with 2xCPUs Intel Xeon-Gold 6252 (2.1GHz/24-core), 192GB RAM, 2x300GB HDD for OS RHEL 8.6 (already installed) and we have DAS (direct-attached-storage) with 18 x 1.6TB SSD drives inside. I attached 6 x1.6TB SSD from the DAS to each of the 3 servers (as JBOD). Now I can see these 6 SSDs as 12 devices because the DAS storage has two paths (for redundancy) to the disks (sda, sdb, sdc, sdd, sde, sdf, sdg, sdh, sdi, sdj, sdk, sdl). My question is shall I configure multipath from RHEL 8.6 OS (for example sda+sdbb=md0) or cephadm will handle the multipath by itself?

I had hopes this might work on the latest Raspbian / Raspberry Pi arch but I'm sad to report it fails at installing cephadm package, which is not available.

amazing

I got "mgr is not available" error after executing "cephadm bootstrap --mon-ip <IP>" command.
What is the problem? :(

Question for you. When I go to the Dashboard Create OSD step, the [add] button is grayed out (No Devices Available). Any ideas what is wrong. Need to fdisk the drives? Thanks in advance

You're a wizard! Your level is what I strive for! Tell me, will there be a video about deploying OpenStack using Kolla Ansible?

Best video about Cephadm. Thank you a lot. I have tried this step by step. All is fine, but I set mon service 3 on my host, it is only runs 1 mon service on cephadm-1, not starts other mon services. Are there any tips for this? Thanks for the best video about deploy Ceph

I have installed my cephadm using sudo apt install -y cephadm, is this practically the same thing?

Nice video, we are now in a stage to deploy ceph in production. In first step is our goal to connect it to vSphere and we are not decided if we will do it with NFS or ISCSI. Can you make some video about this topics ? Especially we are interested with NFS ingress service. We need to migrate all data from SAN to Ceph and then to connect Ceph to new OpenStack cluster.

As the next video, would it be interesting to configure bi directional synchronization between two ceph clusters, now that's so easy to set up ceph clusters 😁?

This is amazing! Thank you!

Yeah finally ^^ Thank you very much!