Corosync - Mysterious reboot after network flapping

Oct 11, 2020

I have four servers in a cluster. The last night, we faced to a big network flapping on 'srva' (private network and public network) with an impact to the private network ''. The expected behavior was to get the three nodes (srvb, srvc, srvd) working together and the node srva getting out of the cluster.
But after a delay, every three nodes (srvb, srvc, srvd) were rebooted by the system and only the node 'srva' stayed up and never be rebooted... In summary, only the node on which there was a problem remained active. Why?

Note that public network was 100% available during the outage (ring1) expected for the node A (srva).

Here is my corosync configuration :

logging {
  debug: off
  to_syslog: yes

nodelist {
  node {
    name: srvb
    nodeid: 2
    quorum_votes: 1
  node {
    name: srvd
    nodeid: 4
    quorum_votes: 1
  node {
    name: srvc
    nodeid: 3
    quorum_votes: 1
  node {
    name: srva
    nodeid: 1
    quorum_votes: 1

quorum {
  provider: corosync_votequorum
  wait_for_all: 1
  two_node: 0
  last_man_standing: 1
  last_man_standing_window: 10000
  auto_tie_breaker: 1
  auto_tie_breaker_node: lowest

totem {
  cluster_name: Cluster
  config_version: 6
  interface {
    knet_ping_interval: 200
    knet_ping_timeout: 5000
    knet_pong_count: 1
    linknumber: 0
  interface {
    knet_ping_interval: 200
    knet_ping_timeout: 5000
    knet_pong_count: 1
    linknumber: 1
  ip_version: ipv4
  link_mode: passive
  secauth: on
  version: 2

Datacenter configuration :

ha: shutdown_policy=migrate
migration: insecure,network=

Can you help me to find the guilty in my configuration?

Thank you for your time,

Best regards,

$ pveversion -v
proxmox-ve: 6.2-2 (running kernel: 5.4.65-1-pve)
pve-manager: 6.2-15 (running version: 6.2-15/48bd51b6)
pve-kernel-5.4: 6.2-7
pve-kernel-helper: 6.2-7
pve-kernel-5.4.65-1-pve: 5.4.65-1
pve-kernel-5.4.34-1-pve: 5.4.34-2
ceph-fuse: 12.2.11+dfsg1-2.1+b1
corosync: 3.0.4-pve1
criu: 3.11-3
glusterfs-client: 5.5-3
ifupdown: 0.8.35+pve1
ksm-control-daemon: 1.3-1
libjs-extjs: 6.0.1-10
libknet1: 1.16-pve1
libproxmox-acme-perl: 1.0.5
libpve-access-control: 6.1-3
libpve-apiclient-perl: 3.0-3
libpve-common-perl: 6.2-4
libpve-guest-common-perl: 3.1-3
libpve-http-server-perl: 3.0-6
libpve-storage-perl: 6.2-9
libqb0: 1.0.5-1
libspice-server1: 0.14.2-4~pve6+1
lvm2: 2.03.02-pve4
lxc-pve: 4.0.3-1
lxcfs: 4.0.3-pve3
novnc-pve: 1.1.0-1
proxmox-backup-client: 1.0.1-1
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.3-10
pve-cluster: 6.2-1
pve-container: 3.2-2
pve-docs: 6.2-6
pve-edk2-firmware: 2.20200531-1
pve-firewall: 4.1-3
pve-firmware: 3.1-3
pve-ha-manager: 3.1-1
pve-i18n: 2.2-2
pve-qemu-kvm: 5.1.0-6
pve-xtermjs: 4.7.0-2
qemu-server: 6.2-19
smartmontools: 7.1-pve2
spiceterm: 3.1-1
vncterm: 1.6-2
zfsutils-linux: 0.8.4-pve2
All servers, same result as above.
Last edited:


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