** Description changed: [Impact] If a user is tracking a process with PID > 32767 keepalived will not be able to work as expected. This bug was fixed upstream here: https://github.com/acassen/keepalived/commit/23a5b8113bf0b8ec4718443df0406882e8e4d831 [Test Plan] Launch a Focal VM and run the following commands: # install keepalived and nginx $ apt install -y nginx keepalived # configure keepalived to track the nginx process $ cat << EOF > /etc/keepalived/keepalived.conf global_defs { - enable_script_security + enable_script_security } vrrp_track_process track_nginx { - process nginx - weight 10 - delay 1 + process nginx + weight 10 + delay 1 } vrrp_instance lb { - interface enp5s0 - state MASTER - priority 100 - virtual_router_id 50 - authentication { - auth_type PASS - auth_pass password - } - track_process { - track_nginx - } - virtual_ipaddress { - 10.191.226.19 - } + interface enp5s0 + state MASTER + priority 100 + virtual_router_id 50 + authentication { + auth_type PASS + auth_pass password + } + track_process { + track_nginx + } + virtual_ipaddress { + 10.191.226.19 + } } EOF $ systemctl restart keepalived # stop nginx process to loose quorum $ systemctl stop nginx $ journalctl -u keepalived | grep Quorum Feb 07 20:13:04 keepalived-debug Keepalived_vrrp[3346]: Quorum lost for tracked process track_nginx # start nginx process to gain quorum $ systemctl start nginx $ pidof nginx 3282 3281 $ journalctl -u keepalived | grep Quorum Feb 07 20:13:04 keepalived-debug Keepalived_vrrp[3346]: Quorum lost for tracked process track_nginx Feb 07 20:19:58 keepalived-debug Keepalived_vrrp[3346]: Quorum gained for tracked process track_nginx # stop nginx process to loose quorum again $ systemctl stop nginx $ journalctl -u keepalived | grep Quorum Feb 07 20:13:04 keepalived-debug Keepalived_vrrp[3346]: Quorum lost for tracked process track_nginx Feb 07 20:19:58 keepalived-debug Keepalived_vrrp[3346]: Quorum gained for tracked process track_nginx Feb 07 20:21:39 keepalived-debug Keepalived_vrrp[3346]: Quorum lost for tracked process track_nginx # start nginx process forcing its PID to be > 32767 $ echo 32767 > /proc/sys/kernel/ns_last_pid; systemctl start nginx $ pidof nginx 32773 32772 # quorum is not gained again $ journalctl -u keepalived | grep Quorum Feb 07 20:13:04 keepalived-debug Keepalived_vrrp[3346]: Quorum lost for tracked process track_nginx Feb 07 20:19:58 keepalived-debug Keepalived_vrrp[3346]: Quorum gained for tracked process track_nginx Feb 07 20:21:39 keepalived-debug Keepalived_vrrp[3346]: Quorum lost for tracked process track_nginx + To make sure the bug is fixed we need to install the fixed keepalived + package, then stop and start the nginx process (with PID > 32767). After + that, the quorum will be lost again and then regained: + + $ systemctl stop nginx + $ systemctl start nginx + $ pidof nginx + 33505 33504 + $ journalctl -u keepalived | grep Quorum + Feb 08 14:46:47 keepalived-debug2 Keepalived_vrrp[8079]: Quorum lost for tracked process track_nginx + Feb 08 14:47:00 keepalived-debug2 Keepalived_vrrp[8079]: Quorum gained for tracked process track_nginx + Feb 08 14:47:19 keepalived-debug2 Keepalived_vrrp[8079]: Quorum lost for tracked process track_nginx + Feb 08 14:49:01 keepalived-debug2 Keepalived_vrrp[33346]: Quorum lost for tracked process track_nginx + Feb 08 14:49:14 keepalived-debug2 Keepalived_vrrp[33346]: Quorum gained for tracked process track_nginx [Where problems could occur] The upstream fix is quite straightforward but if a problem would occur it would be manifested in any tracking process feature in keepalived. Since keepalived is widely used in HA, this might be reflected in some specific setups using keepalived. [Original description] Keepalived doesn't regain quorum when using tracked process due to a bug in high numbered pids The upstream has already fixed in a patch release 2.0.20 https://serverfault.com/questions/993432/keepalived-doesnt-gain-quorum- when-tracked-process-comes-up Could we please get the 2.0.20 released to 20.04
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1960036 Title: [SRU] Doesn't regain quorum when tracked process restarts with PID > 32767 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/keepalived/+bug/1960036/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
