pf9-hostagent Failing With Error "No module named 'apt_pkg'"

Problem

The host is disconnected from Management Plane and pf9-hostagent service is failing and hostagent-daemon.log shows error No module named 'apt_pkg'

hostagent-daemon.log

customlogger.py INFO - from pf9app.pf9_app_db import Pf9AppDb as AppDb, Pf9AgentDb
customlogger.py INFO -   File "/opt/pf9/hostagent/lib/python3.9/site-packages/pf9app/pf9_app_db.py", line 21, in <module>

customlogger.py INFO - import apt
customlogger.py INFO -   File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>

customlogger.py INFO - import apt_pkg
customlogger.py INFO - ModuleNotFoundError
customlogger.py INFO - :
customlogger.py INFO - No module named 'apt_pkg'

Environment

• pf9-hostagent
• Python3

Cause

When a newer python version is installed the link will update to point to the newest python version, which leads to the error of apt_pkg module not being found.

Resolution

• Make sure package python3-apt is installed on the host.
• Fix the python symblink:

command

# cd /usr/lib/python3/dist-packages
# ln -s apt_pkg.cpython-35m-x86_64-linux-gnu.so apt_pkg.so
# ln -s apt_inst.cpython-35m-x86_64-linux-gnu.so  apt_inst.so

• Restart pf9-hostagent service:

command

# systemctl restart pf9-hostagent