Using the CEPH Toolbox

If you’re experiencing issues with your Ceph storage, you can use the Ceph toolbox.

From the Redgate Clone machine, run the following command to download the Ceph toolbox, which allows you to inspect the contents of the Ceph disk:

curl -O https://raw.githubusercontent.com/rook/rook/master/deploy/examples/toolbox.yaml

This will download the file to your current directory. Run ls to confirm that toolbox.yaml  is present.

Next, edit the file using a text editor available on your machine, such as vi, vim, or nano.

Update the namespace at the top of the file to redgate-clone-app, then save your changes.

 
Once the toolbox file is in place, run the following commands from its directory. Use ls in the terminal to confirm the file is present; if it isn't, navigate to the correct location using cd.

kubectl apply -f toolbox.yaml

After this, if you run a: 

kubectl get pods -A

You should see a new pod at the bottom, rook-ceph-tools:

 
You can then go into it to run the commands to check the health of the Ceph storage with the below:

kubectl -n redgate-clone-app exec -it deploy/rook-ceph-tools -- bash

You will see on the left that it now says bash as we are in the pod:

ceph status

This will give us some general information about the storage used and its health:  

ceph df 

It should show the storage used and in which pools.
 
Type exit to return to the shell, then run the following commands to check the system health.
 
Check the pod health:

kubectl -n redgate-clone-app get cephcluster

You can also run:

kubectl -n redgate-clone-app get pods

kubectl -n redgate-clone-app logs <pod>

This provides health status, capacity, OSD state and error logs. Run the first command to show the pods then copy and paste the name after "logs".