We hit this error during "glance-manage db_sync": *ImportError: cannot import name greenpool.* Any idea what the root cause is and how to fix it? We have the following rpms installed (thought related). python2-greenlet-0.4.9-1.el7.x86_64.rpm python2-eventlet-0.18.4-2.el7.noarch.rpm python2-gevent-1.1.2-2.el7.x86_64.rpm Debug: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: Sleeping for 5 seconds between tries Debug: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: Exec try 10/10 Debug: Exec[neutron-db-sync](provider=posix): Executing 'neutron-db-manage upgrade heads' Debug: Executing: 'neutron-db-manage upgrade heads' Debug: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: Sleeping for 5 seconds between tries Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: Traceback (most recent call last): Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/bin/neutron-db-manage", line 10, in <module> Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: sys.exit(main()) Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/neutron/db/migration/cli.py", line 657, in main Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: return_val |= bool(CONF.command.func(config, CONF.command.name)) Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/neutron/db/migration/cli.py", line 179, in do_upgrade Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: run_sanity_checks(config, revision) Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/neutron/db/migration/cli.py", line 641, in run_sanity_checks Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: script_dir.run_env() Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/alembic/script/base.py", line 425, in run_env Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: util.load_python_file(self.dir, 'env.py') Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/alembic/util/pyfiles.py", line 81, in load_python_file Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: module = load_module_py(module_id, path) Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/alembic/util/compat.py", line 141, in load_module_py Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: mod = imp.load_source(module_id, path, fp) Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/neutron/db/migration/alembic_migrations/env.py", line 24, in <module> Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: from neutron.db.migration.models import head # noqa Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/neutron/db/migration/models/head.py", line 28, in <module> Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: from neutron.common import utils Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/neutron/common/utils.py", line 35, in <module> Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: import eventlet Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/eventlet/__init__.py", line 10, in <module> Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: from eventlet import convenience Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: File "/usr/lib/python2.7/site-packages/eventlet/convenience.py", line 4, in <module> Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: from eventlet import greenpool Notice: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]/returns: ImportError: cannot import name greenpool Error: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]: Failed to call refresh: 'neutron-db-manage upgrade heads' returned 1 instead of one of [0] Error: /Stage[main]/Neutron::Db::Sync/Exec[neutron-db-sync]: 'neutron-db-manage upgrade heads' returned 1 instead of one of [0] Notice: /Stage[main]/Neutron::Deps/Anchor[neutron::dbsync::end]: Dependency Exec[neutron-db-sync] has failures: true -- <https://smart.salesforce.com/sig/peiyong.zhang//us_mb/default/link.html>