Public bug reported: An upgrade from Ubuntu 12.04 to 14.04 using 'sudo do-release-upgrade -d' takes a long time (over 3 minutes) to start after answering "yes" to the question: If you continue, an additional SSH daemon will be started at port '1022'. Do you want to continue?
Running 'ps afx' at this time shows that 'iptables -L' is being run from '/usr/bin/python /tmp/update-manager-djUfxZ/trusty --mode=server --frontend=DistUpgradeViewText' I think this is because there is an iptables blacklist created by the shorewall package. So running 'iptables' without the '-n' option to disable DNS lookups means that a DNS query is launched for every IP address in the blacklist, some of which do not resolve and so the upgrade scripts has to wait for a timeout on each of them. Example of iptables being run with DNS lookups: $ sudo time -p iptables -L > /dev/null real 174.34 user 0.08 sys 0.09 Example of iptables being run without DNS lookups: $ sudo time -p iptables -nL > /dev/null real 0.08 user 0.00 sys 0.00 The code that runs the 'iptables -L' command seems to be in the utils.py in the update-manager temp directory in /tmp/ (/tmp/update-manager- djUfxZ/utils.py in this case) and as far as I can tell is only run to see if iptabes is active or not. So would it be possible to change the iptables command to be 'iptables -nL' so that DNS queries are disabled? I think this bug may also effect other upgrades, for example 10.04 to 12.04. ** Affects: update-manager (Ubuntu) Importance: Undecided Status: New ** Tags: dist-upgrade ** Tags added: dist-upgrade ** Summary changed: - Upgrade using takes a long time to start because 'iptables -L' runs with DNS lookups enabled + Upgrade using do-release-upgrade takes a long time to start because 'iptables -L' runs with DNS lookups enabled -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1290825 Title: Upgrade using do-release-upgrade takes a long time to start because 'iptables -L' runs with DNS lookups enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1290825/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs