An SSH login slow problem tracking record

SSH login to a server yesterday, but SSH login is slow, almost half a minute to log in successfully, so it is tracked check

①, ssh ip-vvv, or ssh ip-v

Used to check where SSH is the longest

Then we find that the longest wait time after entering interactive session statement, more than 20 seconds, indicates the problem of password authentication during non-SSH login.

②, this can not see what the problem, so use Starce to track

Starce-o ~/starce_ssh.txt-t SSH IP

Cat ~/starce_ssh.txt found:

Clock_gettime (0x7/* clock_??? */, {5243451, 134078578}) = 0 <0.000026>

Select (7, [3], [], NULL, NULL) = 1 (in [3]) <25.026978>

But I can't read this place, and I'm sad.

③, so try to check the messages log of the server logged in, there is a significant discovery

DBUS[7782]: [System] Failed to activate service ' org.freedesktop.login1 ': Timed out

DBUS-DAEMON:DBUS[7782]: [System] Failed to activate service ' org.freedesktop.login1 ': Timed out

Show that the service timed out, the Internet to find information, the main effect is as follows:

Dbus Service restart, Systemd-logind service does not restart, you can view the status of Systemctl status Systemd-logind, the workaround is to restart the service Systemctl restart Systemd-logind

Reference Document: Http://serverfault.com/questions/707377/slow-ssh-login-activation-of-org-freedesktop-login1-timed-out

An SSH login slow problem tracking record