Hmm, on a cloud instance this looks different, even when logged in
multiple time, the output only shows the master process:
# systemctl status ssh
● ssh.service - OpenBSD Secure Shell server
Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset:
enabled)
Active: active (running) since Fri 2016-04-01 06:00:11 UTC; 1h 44min ago
Main PID: 971 (sshd)
Tasks: 1 (limit: 512)
Memory: 5.3M
CPU: 169ms
CGroup: /system.slice/ssh.service
└─971 /usr/sbin/sshd -D
Package versions are identical in both systems:
root@jr-xeni1:~# apt-cache policy systemd
systemd:
Installed: 229-3ubuntu1
Candidate: 229-3ubuntu1
Version table:
*** 229-3ubuntu1 500
500 http://nova.clouds.archive.ubuntu.com/ubuntu xenial/main amd64
Packages
100 /var/lib/dpkg/status
root@jr-xeni1:~# apt-cache policy openssh-server
openssh-server:
Installed: 1:7.2p2-2
Candidate: 1:7.2p2-2
Version table:
*** 1:7.2p2-2 500
500 http://nova.clouds.archive.ubuntu.com/ubuntu xenial/main amd64
Packages
100 /var/lib/dpkg/status
So I'm wondering what else could be causing the different behaviour
here.
** Also affects: systemd
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1564451
Title:
User processes are counted towards systemd limit for sshd processes
Status in systemd:
New
Status in openssh package in Ubuntu:
New
Bug description:
When running Xenial, user processes are counted towards the limit for
the ssh.service, with a limit of 512. So if I login as a normal user
via ssh and start 512 processes, nobody will be able to login any more
and even all other users currently logged in will not be able to start
any new tasks. I'm not certain whether this behaviour is by design,
but to me it looks like a critical DOS possibility, so tagging as
security bug.
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https://bugs.launchpad.net/systemd/+bug/1564451/+subscriptions
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