Situation:
There are 12 virtual machines running on a single server. While 5 of them were working, there were no problems. As soon as they started all of them, some machines started to stop working (the status is "Working", but the machines themselves froze did not allow any reboot, nothing).
If "Poweroff" or "reset", then the machine hung with the status "Stopping". When trying to "Kill" the VM process, the HOST machine freezes, from which only reset saves. At the same time, the RAM is fine (there is about 100GB left in the stock, the SWAP is empty, the total CPU load is about 50%). PostgreSQL 12 is installed on the VMs. I didn't find anything in the logs.
HOST machine: Ubuntu 20.04, 256GB ram, 12TB ssd, VirtualBox version: 6.1.18.
sysctl.conf:
Code: Select all
vm.swappiness=5
vm.zone_reclaim_mode=0
vm.overcommit_memory=2
vm.overcommit_ratio=90
vm.vfs_cache_pressure=100
vm.min_free_kbytes=16384
kernel.shmmax=17179869184
kernel.shmmni=6144
kernel.sched_migration_cost_ns=5000000
kernel.sched_autogroup_enabled=0
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
Logs in the attached files (approximate crash time: 2021.04.26 11: 27: 00, restarted the HOST machine at 11: 30: 00)
1) KartyFarmani_PG.vbox - config of the falling virtual machine
2) syslog.HOST.log - logs of the HOST machine for the 26th number
3) syslog.VM.log - logs of the virtual machine
4) VBox.log-VirtualBox logs.
5) PG - PostgreSQL logs on the VM.