without lxc.kmsg = 0 in the /etc/lxc/lxc.conf, systemd's journalctl consumes 100% cpu when containers are started. https://wiki.archlinux.org/index.php/Lxc-systemd "By default lxc symlinks /dev/kmsg to /dev/console, this leads to journald running 100% cpu usage all the time."
(lxc.kmsg = 0 actually needs to go into each lxc container config... I assume putting it in /etc/lxc/lxc.conf will make that happen? I need to test this)
I think this bug is a duplicate of bug 1141456. The issue is fixed in upstream commit e8a16654.
lxc-1.0.7-4.fc21 has been submitted as an update to Fedora 21. https://bodhi.fedoraproject.org/updates/FEDORA-2015-ebfe46536f
lxc-1.0.7-4.fc21 has been pushed to the Fedora 21 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with $ su -c 'dnf --enablerepo=updates-testing update lxc' You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-ebfe46536f
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lxc-1.0.7-4.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.