Cluster is Unable to Start with cb_ssh Error Message

Products

• Carbon Black EDR

Issue/Introduction

When attempting to startup a new cluster, error messages for the cb_ssh key. 

Validating privileges on remote nodes.
sed: can't read /etc/cb/cb_ssh: No such file or directory
sed: cannot rename /etc/cb/cb_ssh: No such file or directory
sed: warning: failed to get security context of /etc/cb/cb_ssh: No such file or directory
..
can only concatenate str (not "NoneType") to str
multiprocessing.pool.RemoteTraceback:
"""
Traceback (most recent call last):
...
File "/usr/share/cb/virtualenv/lib/python3.10/site-packages/cb/maintenance/cbcluster/ssh_client.py", line 113, in _ensure_pkey_has_proper_header

Environment

• Carbon Black EDR Server: All Versions
• Clustered

Cause

Paramiko requires the ssh key to have the RSA header, the application is unable to use sed to modify the header context of the /etc/cb/cb_ssh key

Resolution

1. Run this command to change the format. 

   ssh-keygen -p -m PEM -f /etc/cb/cb_ssh

2. Attempt to start the cluster again.