CB Response: System boot hangs on startup with cb-enterprise running

Products

• Carbon Black EDR (formerly Cb Response)

Issue/Introduction

• OS fails to complete boot process, and hangs with no errors once loading bar at bottom of screen completes.
• Hitting Esc key shows CB-Enterprise services partially starting, but hung after RabbitMQ shows OK.
• Terminal window will not recognize any commands.

Environment

• CB Response Server: 6.3.1
• CentOS: 6.X

Cause

DNS Server was updated, but the Response Server was never updated with the correct records, causing DNS resolution to fail.

Resolution

1. Login as single user mode to access the system. 
2. Disable Response services from automatically starting:

   chkconfig cb-enterprise off

3. Adjust /etc/resolv.conf and /etc/sysconfig/network-scripts/ifcfg-eth0 to reflect the correct DNS server entries. 
4. Run the following command to read the configuration changes:

   /etc/init.d/network restart

5. Start Response services:

   sudo service cb-enterprise start