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From Cloud List <cloud-l...@sg.or.id>
Subject CloudStack 4.8.0 with LXC - LibvirtException: unsupported configuration: System lacks NETNS support
Date Fri, 10 Jun 2016 10:39:32 GMT
Dear all,

We tried to setup an LXC cluster and add an LXC host into a test CloudStack
4.8.0.1 environment. The cluster is created and the LXC host is created
successfully. We also tried to follow below documentation to create an
Ubuntu LXC template -- we are running Ubuntu 12.04.5 LTS.

https://cwiki.apache.org/confluence/display/CLOUDSTACK/LXC+Template+creation

===
Install lxc: apt-get install lxc

Create  a container with any name, in our case 'ubuntu':

sudo lxc-create -t download -n ubuntu -- --dist ubuntu --release trusty
--arch amd64

Creation of the LXC container will take a lot of time, it will be stored
here: /var/lib/lxc/ubuntu

Next stop the container:
sudo lxc-stop -n ubuntu

Next create a temp director, tar the rootfs and export the template:
mkdir -p /tmp/lxc-template
cd /tmp/lxc-template
sudo tar --numeric-owner -czf /tmp/lxc-template/template.tar.gz
/var/lib/lxc/ubuntu/rootfs/
===

As per suggestion from Rohit on another thread, I saved the template file
as .tar and register it to cloudstack with HVM disabled. I then tried to
create an LXC container instance using the template, but after a long
"Creating" process, the provisioning will fail with insufficient capacity
error.

===
2016-06-10 18:24:45,468 DEBUG [o.a.c.f.j.i.AsyncJobManagerImpl]
(API-Job-Executor-44:ctx-c8a4afdc job-232) (logid:523a0c37) Complete async
job-232, jobStatus: FAILED, resultCode: 530, result:
org.apache.cloudstack.api.response.ExceptionR
esponse/null/{"uuidList":[],"errorcode":530,"errortext":"Unable to start a
VM due to insufficient capacity"}
===

Further check on the LXC host's agent.log shows that the provisioning
failed due to libvirt exception, which says that the configuration is
unsupported because the system lacks NETNS support

"LibvirtException: unsupported configuration: System lacks NETNS support"

See excerpts of the logs below:

===
2016-06-10 18:24:43,740 DEBUG [resource.wrapper.LibvirtStartCommandWrapper]
(agentRequest-Handler-1:null) starting i-2-42-VM: <domain type='lxc'>
<name>i-2-42-VM</name>
<uuid>c29a74fb-e4bc-4aa2-bef4-3c8844de87df</uuid>
<description>Ubuntu 14.04 (64-bit)</description>
<clock offset='utc'>
<timer name='kvmclock' >
</timer>
</clock>
<features>
<pae/>
<apic/>
<acpi/>
</features>
<devices>
<emulator></emulator>
<interface type='bridge'>
<source bridge='cloudbr0'/>
<mac address='06:a5:1c:00:00:2a'/>
<model type='virtio'/>
</interface>
<filesystem type='mount'>
  <source
dir='/mnt/d7678837-9f9f-32ab-99f3-b508feb3595a/6d26a879-999f-4cba-bfcc-1d2d9e70af5c'/>
  <target dir='/'/>
</filesystem>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target port='0'/>
</console>
</devices>
<memory>1048576</memory>
<devices>
<memballoon model='none'/>
</devices>
<vcpu>1</vcpu>
<os>
<type>exe</type>
<init>/sbin/init</init>
</os>
<cputune>
<shares>1000</shares>
</cputune>
<cpu></cpu><on_reboot>restart</on_reboot>
<on_poweroff>destroy</on_poweroff>
<on_crash>destroy</on_crash>
</domain>

2016-06-10 18:24:43,743 WARN  [resource.wrapper.LibvirtStartCommandWrapper]
(agentRequest-Handler-1:null) LibvirtException
org.libvirt.LibvirtException: unsupported configuration: System lacks NETNS
support
        at org.libvirt.ErrorHandler.processError(Unknown Source)
        at org.libvirt.ErrorHandler.processError(Unknown Source)
        at org.libvirt.Connect.domainCreateXML(Unknown Source)
        at
com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.startVM(LibvirtComputingResource.java:1293)
        at
com.cloud.hypervisor.kvm.resource.wrapper.LibvirtStartCommandWrapper.execute(LibvirtStartCommandWrapper.java:82)
        at
com.cloud.hypervisor.kvm.resource.wrapper.LibvirtStartCommandWrapper.execute(LibvirtStartCommandWrapper.java:46)
        at
com.cloud.hypervisor.kvm.resource.wrapper.LibvirtRequestWrapper.execute(LibvirtRequestWrapper.java:75)
        at
com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:1317)
        at com.cloud.agent.Agent.processRequest(Agent.java:522)
        at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:830)
        at com.cloud.utils.nio.Task.call(Task.java:83)
        at com.cloud.utils.nio.Task.call(Task.java:29)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
2016-06-10 18:24:43,744 DEBUG [kvm.storage.KVMStoragePoolManager]
(agentRequest-Handler-1:null) Disconnecting disk
6d26a879-999f-4cba-bfcc-1d2d9e70af5c
2016-06-10 18:24:43,744 INFO  [kvm.storage.LibvirtStorageAdaptor]
(agentRequest-Handler-1:null) Trying to fetch storage pool
d7678837-9f9f-32ab-99f3-b508feb3595a from libvirt
2016-06-10 18:24:43,744 DEBUG [kvm.resource.LibvirtConnection]
(agentRequest-Handler-1:null) Looking for libvirtd connection at: lxc:///
2016-06-10 18:24:43,751 DEBUG [kvm.storage.LibvirtStorageAdaptor]
(agentRequest-Handler-1:null) Succesfully refreshed pool
d7678837-9f9f-32ab-99f3-b508feb3595a Capacity: 483387244544 Used:
127107334144 Available: 356279910400
2016-06-10 18:24:43,757 DEBUG [cloud.agent.Agent]
(agentRequest-Handler-1:null) Seq 7-8790463522673787745:  { Ans: , MgmtId:
181122461655966, via: 7, Ver: v1, Flags: 10,
[{"com.cloud.agent.api.StartAnswer":{"vm":{"id":42,"name":"i-2-42-VM","type":"User","cpus":1,"minSpeed":1000,"maxSpeed":2000,"minRam":1073741824,"maxRam":1073741824,"arch":"x86_64","os":"Ubuntu
14.04 (64-bit)","platformEmulator":"Ubuntu
14.04","bootArgs":"","enableHA":true,"limitCpuUse":true,"enableDynamicallyScaleVm":false,"vncPassword":"hOWX3h7K6kkOpL316OApzQ","vncAddr":"192.168.3.202","params":{"memoryOvercommitRatio":"1.0","cpuOvercommitRatio":"2.0","Message.ReservedCapacityFreed.Flag":"false"},"uuid":"c29a74fb-e4bc-4aa2-bef4-3c8844de87df","disks":[{"data":{"org.apache.cloudstack.storage.to.VolumeObjectTO":{"uuid":"6d26a879-999f-4cba-bfcc-1d2d9e70af5c","volumeType":"ROOT","dataStore":{"org.apache.cloudstack.storage.to.PrimaryDataStoreTO":{"uuid":"d7678837-9f9f-32ab-99f3-b508feb3595a","id":5,"poolType":"NetworkFilesystem","host":"192.168.0.242","path":"/export/cloudstack3","port":2049,"url":"NetworkFilesystem://
192.168.0.242/export/cloudstack3/?ROLE=Primary&STOREUUID=d7678837-9f9f-32ab-99f3-b508feb3595a"}},"name":"ROOT-42","size":479057920,"path":"6d26a879-999f-4cba-bfcc-1d2d9e70af5c","volumeId":50,"vmName":"i-2-42-VM","accountId":2,"format":"DIR","provisioningType":"THIN","id":50,"deviceId":0,"cacheMode":"NONE","hypervisorType":"LXC"}},"diskSeq":0,"path":"6d26a879-999f-4cba-bfcc-1d2d9e70af5c","type":"ROOT","_details":{"managed":"false","storagePort":"2049","storageHost":"192.168.0.242","volumeSize":"479057920"}},{"data":{"org.apache.cloudstack.storage.to.TemplateObjectTO":{"id":0,"format":"ISO","accountId":0,"hvm":false}},"diskSeq":3,"type":"ISO"}],"nics":[{"deviceId":0,"networkRateMbps":100,"defaultNic":true,"pxeDisable":false,"nicUuid":"938ed009-54fa-4dd9-be7c-e5c95ab4fd27","uuid":"4b8f3aa8-21bb-4362-b695-ab4e41141227","ip":"192.168.0.192","netmask":"255.255.255.0","gateway":"192.168.0.1","mac":"06:a5:1c:00:00:2a","dns1":"8.8.8.8","dns2":"8.8.4.4","broadcastType":"Native","type":"Guest","broadcastUri":"vlan://untagged","isSecurityGroupEnabled":true}]},"result":false,"details":"unsupported
configuration: System lacks NETNS support","wait":0}}] }
2016-06-10 18:24:43,935 DEBUG [cloud.agent.Agent]
(agentRequest-Handler-2:null) Request:Seq 7-8790463522673787746:  { Cmd ,
MgmtId: 181122461655966, via: 7, Ver: v1, Flags: 100011,
[{"com.cloud.agent.api.StopCommand":{"isProxy":false,"executeInSequence":false,"checkBeforeCleanup":false,"vmName":"i-2-42-VM","wait":0}}]
}
2016-06-10 18:24:43,936 DEBUG [cloud.agent.Agent]
(agentRequest-Handler-2:null) Processing command:
com.cloud.agent.api.StopCommand
2016-06-10 18:24:43,936 DEBUG [kvm.resource.LibvirtConnection]
(agentRequest-Handler-2:null) Looking for libvirtd connection at:
qemu:///system
2016-06-10 18:24:43,937 DEBUG [kvm.resource.LibvirtConnection]
(agentRequest-Handler-2:null) Can not find KVM connection for Instance:
i-2-42-VM, continuing.
2016-06-10 18:24:43,938 DEBUG [kvm.resource.LibvirtConnection]
(agentRequest-Handler-2:null) Looking for libvirtd connection at: lxc:///
2016-06-10 18:24:43,939 DEBUG [kvm.resource.LibvirtConnection]
(agentRequest-Handler-2:null) Can not find LXC connection for Instance:
i-2-42-VM, continuing.
2016-06-10 18:24:43,939 WARN  [kvm.resource.LibvirtConnection]
(agentRequest-Handler-2:null) Can not find a connection for Instance
i-2-42-VM. Assuming the default connection.
2016-06-10 18:24:43,939 DEBUG [kvm.resource.LibvirtConnection]
(agentRequest-Handler-2:null) Looking for libvirtd connection at: lxc:///
2016-06-10 18:24:43,940 DEBUG [kvm.resource.LibvirtComputingResource]
(agentRequest-Handler-2:null) Failed to get dom xml:
org.libvirt.LibvirtException: Domain not found: No domain with matching
name 'i-2-42-VM'
2016-06-10 18:24:43,941 DEBUG [kvm.resource.LibvirtComputingResource]
(agentRequest-Handler-2:null) Failed to get dom xml:
org.libvirt.LibvirtException: Domain not found: No domain with matching
name 'i-2-42-VM'
2016-06-10 18:24:43,941 DEBUG [kvm.resource.LibvirtComputingResource]
(agentRequest-Handler-2:null) Try to stop the vm at first
2016-06-10 18:24:43,942 DEBUG [kvm.resource.LibvirtComputingResource]
(agentRequest-Handler-2:null) VM i-2-42-VM doesn't exist, no need to stop it
2016-06-10 18:24:43,943 DEBUG [cloud.agent.Agent]
(agentRequest-Handler-2:null) Seq 7-8790463522673787746:  { Ans: , MgmtId:
181122461655966, via: 7, Ver: v1, Flags: 10,
[{"com.cloud.agent.api.StopAnswer":{"result":true,"wait":0}}] }
2016-06-10 18:25:02,268 DEBUG [kvm.resource.LibvirtConnection]
(UgentTask-5:null) Looking for libvirtd connection at: lxc:///
2016-06-10 18:25:02,271 DEBUG [kvm.resource.LibvirtConnection]
(UgentTask-5:null) Looking for libvirtd connection at: qemu:///system
===

I checked and the system indeed supports namespace as per below result:

===
root@sc-test-kvm-04:/var/log/cloudstack/agent# ip netns show
blue
===

Any pointers on how we can resolve the problem?

Looking forward to your reply, thank you.

Cheers.

-ip-

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