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  • Libvirt packages with RDB support have to be installed on host
  • Enable ceph repo to install rbd dependencies

[ceph-noarch]

name=Ceph noarch packages

baseurl=http://ceph.com/rpm-{ceph-release}/{distro}/noarch 

  • When RBD storage pool is added as primary storage following xml is sent for pool creation on host

<pool type='rbd'>
<name>ae84381b-c273-3c8e-925f-8e384d3216b4</name>
<uuid>ae84381b-c273-3c8e-925f-8e384d3216b4</uuid>
<source>
<host name='10.147.59.89' port='6789'/> - Monitor host
<name>rbd</name> - Pool name
<auth username='admin' type='ceph'>
<secret uuid='ae84381b-c273-3c8e-925f-8e384d3216b4'/> - secret containing auth key
</auth>
</source>
</pool>

  • Secret contains authentication details. Secret is created when RBD pool is created

<secret ephemeral='no' private='no'>
<uuid>ae84381b-c273-3c8e-925f-8e384d3216b4</uuid>
<usage type='ceph'>
<name>admin@10.147.59.89:6789/rbd</name>
</usage>
</secret>

  • When Cloudstack created rbd Data disks, rbd images are created in the pool
  • Rbd image is mappped on to host using "rbd map" command
  • Mapped rbd device on host is then made available to container during attach disk

 

Template

Registering a template and  Launching container from template is already supported. Additional functionality:

...

 KVM system Vms are used and both VPC and non-VPC are supported. Networking services Source NAT, DNS, PF, LB, Vpn, Firewall, Security Groups, Network ACL are supported. Additionally nic hot-plug to userVm (container) is also supported.  Secondary IPs are also supported. 

Console Access

CLOUDSTACK-4990

...

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
  • 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

Open Issues

Min required libvirt version should be documented

  • 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 1.2.11.1

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.