99-troubleshooting.md

Troubleshooting

Shell

A command line is a text-based interface which can be used to input instructions to a computer system. The Linux command line is provided by a program called the shell. When a shell is used interactively, it displays a string when it is waiting for a command from the user. This is called the shell prompt. When a regular user starts a shell, the default prompt ends with a $ character, as shown below.

[user@host ~]$

The $ character is replaced by a # character if the shell is running as the superuser, root. The superuser shell prompt is shown below.

[root@host ~]#

host is the short hostname of the machine the shell is running on. This tutorial will require you to run commands on two machines. One of them is the hypervisor machine which is the machine where all virtual machines (VM) will be installed. Shell prompts for the hypervisor look like this:

# regular user
[okd@okd ~]$

 # superuser
[root@okd ~]#

The other machine is the services VM. Shell prompts for the services VM look like this:

# regular user
[okd@services ~]$

 # superuser
[okd@services ~]$ sudo

Persistent volume claims for filesystem stuck at pending

In some cases, persistent volume claims for the storage class filesystem are stuck at pending state. This can be easily solved by forcing a restart of the csi-cephfsplugin-provisioner pods.

oc delete pod -l app=csi-cephfsplugin-provisioner --grace-period=0 --force