There seems to be a non-infinite open files limit in containerd in eoan (checked in a vm, not lxd, just to be sure):
root@eoan-containerd:~# cat /proc/$(pidof containerd)/limits |grep "Max open files" Max open files 1048576 1048576 files root@eoan-containerd:~# systemctl cat containerd.service # /lib/systemd/system/containerd.service [Unit] Description=containerd container runtime Documentation=https://containerd.io After=network.target [Service] ExecStartPre=-/sbin/modprobe overlay ExecStart=/usr/bin/containerd RestartSec=2 Restart=always Delegate=yes KillMode=process # Having non-zero Limit*s causes performance problems due to accounting overhead # in the kernel. We recommend using cgroups to do container-local accounting. LimitNPROC=infinity LimitCORE=infinity LimitNOFILE=infinity # Comment TasksMax if your systemd version does not supports it. # Only systemd 226 and above support this version. TasksMax=infinity OOMScoreAdjust=-999 [Install] WantedBy=multi-user.target root@eoan-containerd:~# sysctl fs.nr_open fs.nr_open = 1048576 root@eoan-containerd:~# grep nr_open -r /etc/ root@eoan-containerd:~# root@eoan-containerd:~# grep NOFILE -r /lib/systemd/ 2>/dev/null | grep -v ^Binary /lib/systemd/system/containerd.service:LimitNOFILE=infinity /lib/systemd/system/systemd-logind.service:LimitNOFILE=524288 /lib/systemd/system/systemd-journald.service:LimitNOFILE=524288 /lib/systemd/system/rsyslog.service:LimitNOFILE=16384 root@eoan-containerd:~# grep NOFILE -r /etc/ 2>/dev/null | grep -v ^Binary /etc/systemd/user.conf:#DefaultLimitNOFILE= /etc/systemd/system.conf:#DefaultLimitNOFILE=1024:524288 eoan is using systemd 240: root@eoan-containerd:~# apt-cache policy systemd systemd: Installed: 240-6ubuntu9 Candidate: 240-6ubuntu9 Version table: *** 240-6ubuntu9 500 500 http://br.archive.ubuntu.com/ubuntu eoan/main amd64 Packages No relevant entry about limits in systemd's d/changelog. Ubuntu will get the upstream change when a new release is made, so the questions are: a) should we change this now? b) do we even have to, given we already seem to be running witn a non-infinite limit (unclear how we got there, though, maybe a system-wide setting?) -- You received this bug notification because you are a member of Ubuntu Server, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1839445 Title: systemd's service unit should set LimitNOFILE to 1048576 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/containerd/+bug/1839445/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
