** Description changed: [Impact] - + Service/host restart or upgrade of the ovn-host package may render a host participating in a OVN network unusable as the ovn-controller process fails to complete programming of the local Open vSwitch switch flows. [Test Case] - + The issue was discovered when migrating a 3-node OpenStack cloud with 1000 instances deployed in our test lab. A test case could be to repeat that setup. [Regression Potential] - + None, the change of behavior was introduced upstream in [0] and later reversed in [1]. Keeping an idle probe for a unix socket type connection is clearly unnecessary. [Original Bug Report] A change [0] prior to the release of OVN v20.03.0 introduced a change of behavior where the inactivity probe for the ofctrl connection defaults to 5 seconds. Since this normally is a unix socket the default was not to have a inactivity probe at all. On a busy system a inactivity probe of 5 seconds is not enough for the OVN Controller to complete programming of the switch. The change of behavior was corrected in [1] and I think it would be beneficial if Ubuntu backported this fix to the OVN package rather than having charms and/or end users work around the issue by manually configuring the timeout through the `external-ids:ovn-openflow-probe- interval` key in the Open_vSwitch table. Symptoms of this problem is that a OVN controller is either unable to do initial programming of a switch for a host with many ports and flows or that updates are lost on a functional system. The following will be printed in the log: 2020-10-11T18:56:09.355Z|30186|rconn|ERR|unix:/var/run/openvswitch/br- int.mgmt: no response to inactivity probe after 5 seconds, disconnecting 0: https://github.com/ovn-org/ovn/commit/c99069c8934c9ea55d310a8b6d48fb66aa477589 1: https://github.com/ovn-org/ovn/commit/b8af8549396e62d6523be18e104352e334825783
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1899369 Title: ovn-controller: Disable ofctrl probe by default To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1899369/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
