if running redhat 7 BIND9 note the below
Please find the below link which describes the list of unsupported bash prompts.
# echo $PS1
SolarWinds solutions are rooted in our deep connection to our user base in the THWACK® online community. More than 150,000 members are here to solve problems, share technology and best practices, and directly contribute to our product development process. Learn more today by joining now.