“MySQL server has gone away” error.

Devstack deployment one node openstack, the 2nd day login error occurs everytime.

Log on the login web GUI:

Error: Unable to communicate with identity service: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/eventlet/wsgi.py", line 336, in handle_one_response result = self.application(self.environ, start_response) File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 203, in __call__ return app(environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 147, in __call__ resp = self.call_func(req, *args, **self.kwargs) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 208, in call_func return self.func(req, *args, **kwargs) File "/opt/stack/keystone/keystone/common/wsgi.py", line 284, in __call__ response = request.get_response(self.application) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1053, in get_response application, catch_exc_info=False) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1022, in call_application app_iter = application(self.environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 147, in __call__ resp = self.call_func(req, *args, **self.kwargs) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 208, in call_func return self.func(req, *args, **kwargs) File "/opt/stack/keystone/keystone/common/wsgi.py", line 284, in __call__ response = request.get_response(self.application) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1053, in get_response application, catch_exc_info=False) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1022, in call_application app_iter = application(self.environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 147, in __call__ resp = self.call_func(req, *args, **self.kwargs) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 208, in call_func return self.func(req, *args, **kwargs) File "/opt/stack/keystone/keystone/common/wsgi.py", line 284, in __call__ response = request.get_response(self.application) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1053, in get_response application, catch_exc_info=False) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1022, in call_application app_iter = application(self.environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 147, in __call__ resp = self.call_func(req, *args, **self.kwargs) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 208, in call_func return self.func(req, *args, **kwargs) File "/opt/stack/keystone/keystone/common/wsgi.py", line 284, in __call__ response = request.get_response(self.application) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1053, in get_response application, catch_exc_info=False) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1022, in call_application app_iter = application(self.environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 147, in __call__ resp = self.call_func(req, *args, **self.kwargs) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 208, in call_func return self.func(req, *args, **kwargs) File "/opt/stack/keystone/keystone/common/wsgi.py", line 307, in __call__ resp = req.get_response(self.application) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1053, in get_response application, catch_exc_info=False) File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1022, in call_application app_iter = application(self.environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 159, in __call__ return resp(environ, start_response) File "/usr/lib/pymodules/python2.7/routes/middleware.py", line 131, in __call__ response = self.app(environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 159, in __call__ return resp(environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 159, in __call__ return resp(environ, start_response) File "/usr/lib/pymodules/python2.7/routes/middleware.py", line 131, in __call__ response = self.app(environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 159, in __call__ return resp(environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 159, in __call__ return resp(environ, start_response) File "/usr/lib/pymodules/python2.7/routes/middleware.py", line 131, in __call__ response = self.app(environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 159, in __call__ return resp(environ, start_response) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 147, in __call__ resp = self.call_func(req, *args, **self.kwargs) File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 208, in call_func return self.func(req, *args, **kwargs) File "/opt/stack/keystone/keystone/common/wsgi.py", line 181, in __call__ result = method(context, **params) File "/opt/stack/keystone/keystone/identity/core.py", line 273, in get_tenants_for_token context, user_ref['id']) File "/opt/stack/keystone/keystone/common/manager.py", line 34, in _wrapper return f(*args, **kw) File "/opt/stack/keystone/keystone/identity/backends/sql.py", line 244, in get_tenants_for_user .filter_by(user_id=user_id)\ File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 1611, in all return list(self) File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 1721, in __iter__ return self._execute_and_instances(context) File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 1726, in _execute_and_instances mapper=self._mapper_zero_or_none()) File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 724, in execute clause, params or {}) File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1191, in execute params) File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1271, in _execute_clauseelement return self.__execute_context(context) File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1302, in __execute_context context.parameters[0], context=context) File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1401, in _cursor_execute context) File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1394, in _cursor_execute context) File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/default.py", line 299, in do_execute cursor.execute(statement, parameters) File "/usr/lib/pymodules/python2.7/MySQLdb/cursors.py", line 174, in execute self.errorhandler(self, exc, value) File "/usr/lib/pymodules/python2.7/MySQLdb/connections.py", line 36, in defaulterrorhandler raise errorclass, errorvalue OperationalError: (OperationalError) (2006, 'MySQL server has gone away') 'SELECT user_tenant_membership.user_id AS user_tenant_membership_user_id, user_tenant_membership.tenant_id AS user_tenant_membership_tenant_id \nFROM user_tenant_membership \nWHERE user_tenant_membership.user_id = %s' ('bd6e6216e7984ea8be4fe510b98fa384',) . (HTTP 500)

Error: No tenants present for user: admin