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Following steps need to be performed before adding installing agent on LXC host to management server

• set kvmclock.disable=true in /etc/cloudstack/agent/agent.properties
• When cpu,cpuacct are co-mounted, libvirt fails to create containers. This issue is fixed in later versions of libvirt. For libvirt 1.1.1 which comes with RHEL7, below work-around is required
• Fix cgroup co-mounting error in RHEL7: 
  • unmount all cgroups:  
    • umount /sys/fs/cgroup/cpu,cpuacct
    • umount /sys/fs/cgroup/cpuset
    • umount  /sys/fs/cgroup/memory
    • umount  /sys/fs/cgroup/devices
    • umount  /sys/fs/cgroup/freezer
    • umount  /sys/fs/cgroup/net_cls
    • umount  /sys/fs/cgroup/blkio
  • rm /sys/fs/cgroup/cpu /sys/fs/cgroup/cpuacct
  • Add following in /etc/cgconfig.conf

mount {
           cpuset = /sys/fs/cgroup/cpuset;
           cpu = /sys/fs/cgroup/cpu;
           cpuacct = /sys/fs/cgroup/cpuacct;
           memory = /sys/fs/cgroup/memory;
           devices = /sys/fs/cgroup/devices;
           freezer = /sys/fs/cgroup/freezer;
           net_cls = /sys/fs/cgroup/net_cls;
           blkio = /sys/fs/cgroup/blkio;
}

• • service cgconfig stop
  • service cgconfig start
• ToDo: cloudstack-setup-agent script should check if cgroup is properly mounted and raise exception if cgroups are not properly configured

• on RHEL7, NetworkManager resets mac address of the Vm: CLOUDSTACK-7515
• Disable NetworkManager  to work-around this issue:
  • service NetworkManager stop
  • chkconfig NetworkManager off

Versions

LXC version 1.0

Libvirt Version 1.21.1

Open Issues

LXC hosts need not be hvm enabled. So, a VM can also act as a host for LXC conatiners. Currently, cloudstack doesn't allow hosts which are not hvm enabled. This check has to be relaxed for LXC.

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