Unable To Start pf9-ostackhost Service After python-gssapi Module Installation

Problem

• Not able to start pf9-ostackhost service on the KVM host.
• The below logs are observed in /var/log/pf9/ostackhost.log

None

2020-05-06 09:40:32.985 CRITICAL nova [req-xxxxx None None] Unhandled error: AttributeError: 'module' object has no attribute 'GSSException'2020-05-06 09:40:32.985 TRACE nova Traceback (most recent call last):2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/bin/pf9-ostackhost", line 20, in [module]2020-05-06 09:40:32.985 TRACE nova    sys.exit(main())2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/vev/lib/python2.7/site-packages/nova/cmd/compute.py", line 57, in main2020-05-06 09:40:32.985 TRACE nova    topic=compute_rpcapi.RPC_TOPIC)2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/nova/service.py", line 259, in create2020-05-06 09:40:32.985 TRACE nova    periodic_interval_max=periodic_interval_max)2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/nova/service.py", line 131, in __init__2020-05-06 09:40:32.985 TRACE nova    self.manager = manager_class(host=self.host, *args, **kwargs)2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/nova/compute/manager.py", line 506, in __init__2020-05-06 09:40:32.985 TRACE nova    self.compute_api = compute.API()2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/nova/compute/__init__.py", line 39, in API2020-05-06 09:40:32.985 TRACE nova    return importutils.import_object(class_name, *args, **kwargs)2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/oslo_utils/importutils.py", line 44, in import_object2020-05-06 09:40:32.985 TRACE nova    return import_class(import_str)(*args, **kwargs)2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/oslo_utils/importutils.py", line 30, in import_class2020-05-06 09:40:32.985 TRACE nova    __import__(mod_str)2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/nova/compute/api.py", line 57, in [module]2020-05-06 09:40:32.985 TRACE nova    from nova import crypto2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/nova/crypto.py", line 35, in [module]2020-05-06 09:40:32.985 TRACE nova    import paramiko2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/paramiko/__init__.py", line 22, in [module]2020-05-06 09:40:32.985 TRACE nova    from paramiko.transport import SecurityOptions, Transport2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/paramiko/transport.py", line 38, in [module]2020-05-06 09:40:32.985 TRACE nova    from paramiko.auth_handler import AuthHandler2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/paramiko/auth_handler.py", line 48, in [module]2020-05-06 09:40:32.985 TRACE nova    from paramiko.ssh_gss import GSSAuth, GSS_EXCEPTIONS2020-05-06 09:40:32.985 TRACE nova  File "/opt/pf9/venv/lib/python2.7/site-packages/paramiko/ssh_gss.py", line 54, in [module]2020-05-06 09:40:32.985 TRACE nova    GSS_EXCEPTIONS = (gssapi.GSSException,)2020-05-06 09:40:32.985 TRACE nova AttributeError: 'module' object has no attribute 'GSSException'

Environment

• Platform9 Managed OpenStack - All Versions
• Nova

Cause

After installing the python-gssapi module pf9-ostackhost service fails to start.

None

$ rpm -qa | grep gssapipython-gssapi-1.2.0-3.el7.x86_64

Resolution

1. Check if the python-gssapi module is installed

None

$ rpm -qi python-gssapi-1.2.0-3.el7.x86_64Name        : python-gssapiVersion     : 1.2.0Release     : 3.el7Architecture: x86_64

1. Uninstall the module.

None

$ sudo yum remove python-gssapi.x86_64

1. Restart the pf9-ostackhost service.

None

$ systemctl restart pf9-ostackhost

Additional Information

For more information, you can refer to the GitHub discussion for issue 1068.