You have been subscribed to a public bug: If i launch a new cloud instance, and then ssh to it, my ssh login blocks, stopping me from doing useful work while '/usr/lib/update- notifier/apt-check' runs.
By far, the biggest offender of this slow login is /usr/lib/update-notifier/apt-check. To demonstrate, a fresh cloud instance on azure. ## ssh to the instance and run a non-interactive command: $ time ssh $cloudhost /bin/true real 0m5.066s user 0m0.045s sys 0m0.004s ## ssh in and disable updates-available so it wont run at all $ ssh $cloudhost sudo chmod -x /etc/update-motd.d/90-updates-available $ time ssh $cloudhost /bin/true real 0m2.459s user 0m0.026s sys 0m0.015s ## so disabling that bought us 2.5 seconds back. ## How about entirely disabling update-motd $ ssh $cloudhost "sudo cp /etc/pam.d/sshd /etc/pam.d/sshd.dist" $ ssh $cloudhost "sudo sed -i '/^[^#].*pam_motd/s/^/#/' /etc/pam.d/sshd" $ time ssh $cloudhost /bin/true real 0m0.650s user 0m0.041s sys 0m0.004s Note, that these things happen even for non-interactive logins, where the message of the day is completely swallowed. Automation tools suffer this ever time they ssh to a ubuntu system. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: update-notifier-common 3.157 ProcVersionSignature: User Name 3.16.0-30.40-generic 3.16.7-ckt3 Uname: Linux 3.16.0-30-generic x86_64 ApportVersion: 2.14.7-0ubuntu8.2 Architecture: amd64 Date: Thu Feb 26 16:27:02 2015 PackageArchitecture: all ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: update-notifier UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: openssh (Ubuntu) Importance: Undecided Status: New ** Affects: update-notifier (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug uec-images utopic -- apt-check should not be run from update-motd https://bugs.launchpad.net/bugs/1426023 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in Ubuntu. -- 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