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authorMichele Baldessari <michele@acksyn.org>2016-09-27 18:18:33 +0200
committerMichele Baldessari <michele@acksyn.org>2016-09-29 07:41:28 +0200
commitad07a29f9474ef68d0edf218638fe6030c019629 (patch)
tree14bb0597325f6f77af01fe0d2cb6d0f2565b0aa3 /environments/net-single-nic-with-vlans-v6.yaml
parent89efa79599ca4bd5669136eca1e5670926f02b76 (diff)
Fix races in major-upgrade-pacemaker Step2
tripleo-heat-templates/extraconfig/tasks/major_upgrade_controller_pacemaker_2.sh has the following code: ... check_resource mongod started 600 if [[ -n $(is_bootstrap_node) ]]; then ... tstart=$(date +%s) while ! clustercheck; do sleep 5 tnow=$(date +%s) if (( tnow-tstart > galera_sync_timeout )) ; then echo_error "ERROR galera sync timed out" exit 1 fi done # Run all the db syncs cinder-manage db sync ... fi start_or_enable_service rabbitmq check_resource rabbitmq started 600 start_or_enable_service redis check_resource redis started 600 start_or_enable_service openstack-cinder-volume check_resource openstack-cinder-volume started 600 systemctl_swift start for service in $(services_to_migrate); do manage_systemd_service start "${service%%-clone}" check_resource_systemd "${service%%-clone}" started 600 done """ The problem with the above code is that it is open to the following race condition: 1) Bootstrap node is busy checking the galera status via cluster check 2) Non-bootstrap node has already reached: start_or_enable_service rabbitmq and later lines. These lines will be skipped because start_or_enable_service is a noop on non-bootstrap nodes and check_resource rabbitmq only checks that pcs status |grep rabbitmq returns true. 3) Non-bootstrap node can then reach the manage_systemd_service start and it will fail with stuff like: "Job for openstack-nova-scheduler.service failed because the control process exited with error code. See \"systemctl status openstack-nova-scheduler.service\" and \"journalctl -xe\" for details.\n" (because the db tables are not migrated yet) This happens because 3) was started on non-bootstrap nodes before the db-sync statements are complete on the bootstrap node. I did not feel like changing the semantics of check_resource and remove the noop on non-bootstrap nodes as other parts of the tree might rely on this behaviour. Depends-On: Ia016264b51f485b97fa150ebd357b109581342ed Change-Id: I663313e183bb05b35d0c5af016c2d1705c772bd9 Closes-Bug: #1627965
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