snapd was updated in bug 1640978 ** No longer affects: snapd (Ubuntu)
** No longer affects: snapd (Ubuntu Xenial) -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1621336 Title: snapd.boot-ok.service hangs eternally on cloud image upgrades Status in cloud-init package in Ubuntu: Fix Released Status in cloud-init source package in Xenial: Fix Released Bug description: ==== Begin SRU Template [cloud-init] ==== [Impact] One of cloud-init's features is to upgrade the system during first boot so that it is fully up to date when the user code starts running. [Test Case] launch an old instance of 16.04 that will need an update to snapd with user-data that indicates a package upgrade should be done. $ lxc image show ubuntu:74a491804877 autoupdate: false properties: aliases: 16.04,default,lts,x,xenial architecture: amd64 description: ubuntu 16.04 LTS amd64 (release) (20160830) label: release os: ubuntu release: xenial serial: "20160830" version: "16.04" public: true $ printf "#%s\n%s\n" cloud-config "packages: [snapd]" > user-data $ lxc launch ubuntu:74a491804877 xrecreate "--config=user.user-data=$(cat user-data)" $ lxc exec xrecreate -- tail -f /var/log/cloud-init-output.log # you will see the output log hang at: # Setting up snapd (2.14.2~16.04) ... ## Now get new container and patch in cloud-init $ lxc launch ubuntu:74a491804877 xpatched # let it boot, with no user-data saying to update. $ sleep 10 # update the container to new cloud-init, then clean it to make # it look like first boot again. $ lxc file push - xpatched/etc/cloud/cloud.cfg.d/update.cfg < user-data $ lxc exec xpatched -- sh -c ' p=/etc/apt/sources.list.d/proposed.list echo deb http://archive.ubuntu.com/ubuntu xenial-proposed main > "$p" && apt-get update -q && apt-get -qy install cloud-init' $ lxc exec xpatched -- sh -c ' cd /var/lib/cloud && for d in *; do [ "$d" = "seed" ] || rm -Rf "$d"; done rm -Rf /var/log/cloud-init*' $ lxc exec xpatched reboot $ lxc exec xpatched -- tail -f /var/log/cloud-init-output.log # snapd installed and a 'Cloud-init finished' message. [Regression Potential] The change to running package installation later in boot will likely affect some things. However, previously a larger set of things were unreliable. This will make things over all more reliable. ==== End SRU Template [cloud-init] ==== I reproducibly run into an eternal hang when deploying services with Juju, when it prepares a new xenial testbed. The current xenial cloud image does not have the latest snapd, so snapd gets dist-upgraded: Preparing to unpack .../snapd_2.14.2~16.04_amd64.deb ... Warning: Stopping snapd.service, but it can still be activated by: snapd.socket Unpacking snapd (2.14.2~16.04) over (2.13) ... Setting up snapd (2.14.2~16.04) ... [...] hangs The postinst tries to start snapd.boot-ok.service on upgrade: |-cloud-init(311)-+-apt-get(577)---dpkg(845)---snapd.postinst(846)---perl(919)---systemctl(922) | `-sh(354)---tee(355) root 922 0.0 0.0 25316 1412 pts/0 S+ 06:09 0:00 /bin/systemctl start snapd.boot-ok.service This hangs eternally because: - cloud-init's dist-upgrade runs *during* the boot process, so that the system is not fully booted yet when this happens (see bug 1576692); thus multi-user.target is *not* yet active - snapd.boot-ok.service is After=multi-user.target - "systemctl start" is synchronous by default, i. e. it waits until the service is started unless you use --no-block. Thus snapd.postinst waits on snapd.boot-ok.service waits on multi- user.target waits on cloud-init to finish waits on snapd.postinst to finish. I think conceptually you shouldn't start snapd.boot-ok.service in the postinst; if the system is already booted (manual dist-upgrade) it should already be running, and if it does get upgraded during boot (with cloud-init) then you shouldn't pretend that booting is already finished. So I suggest to use dh_installinit with --no-scripts for snapd.boot-ok.service. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1621336/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~group.of.nepali.translators Post to : group.of.nepali.translators@lists.launchpad.net Unsubscribe : https://launchpad.net/~group.of.nepali.translators More help : https://help.launchpad.net/ListHelp
