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2016-05-04 05:23:19 -0600 commented question Controller default config for nova

Hi chrido,

"Unfortunately apt-get install nova-api does not create a default config in /etc/nova/nova.conf": Please check Mitaka repository.

You can use guide:

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2015-09-16 05:33:57 -0600 asked a question How to edit a table in Nova Database?

Hi everyone,

I want insert a column to table instances. I'm editing class Instance in /usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/ but its not reflecting there.

How this issue can be resolved? Thanks.

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2015-05-03 15:25:03 -0600 asked a question [Sahara] Run jobs with input multiple files

Hi everyone,

I want run a job "word count" with 2 (or more) file input: 1.txt and 2.txt on Cluster Vanilla Sahara (OpenStack Juno).

But, sahara only allow run with 1 file input. So i must ssh to cluster and run command line.

We have a other way? Thanks.

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2015-04-28 01:08:25 -0600 asked a question Bandwidth limits network for instances running

Hi everyone,

My OpenStack (Juno) use Neutron with GRE. I create a instance ubuntu server. Now, i want Limit bandwidth network (in/out) for this instance (instance running).

I have references:

But my problem unresolved. I need to configure how (libvirt, Open vSwitch,...)?

Edit instance-x.xml

<interface type='bridge'>
  <mac address='...'/>
  <source bridge='...'/>
  <target dev='...'/>
  <model type='virtio'/>
  <address .../>
           <inbound average='12000'/>   Incomming traffic in KiB\s
           <outbound average='12000'/>  Outgoing traffic in KiB\s

Thank you!

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2015-04-25 08:43:24 -0600 commented answer Resize image: Smallest?

Thanks jdexter and SamYaple :)

2015-04-25 03:07:50 -0600 commented answer Resize image: Smallest?

Hi SamYaple,

I've updated my question.

Thank you.

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2015-04-24 20:57:12 -0600 asked a question Resize image: Smallest?

Hi everyone,

I have a file image qcow2(Ubuntu cloud-image ~ 244M, download from And now, i want convert this file image to raw type, so that file image size the smallest possible.


Usually, i use --disk-format qcow2 to upload glance. Now, I convert file image from qcow2 to raw, example:

qemu-img convert -f qcow2 ubuntu-qcow2.img -O raw ubuntu_raw.img

Size of file image:

Before convert: ubuntu-qcow2.img: 244MB

After: ubuntu-raw.img: 2.2GB

We can create instances from both ubuntu-qcow2.img and ubuntu_raw.img

Here, I want resize (down) file ubuntu-raw.img < 2.2GB the smallest possible, without making error image.

You have a new idea for this problem? Thank you :)

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2015-03-20 10:31:02 -0600 answered a question Call to api sahara?

Hi! Please note that: Authentication required

You can try:

curl -H "X-Auth-Token: $tokenId" http://$ip_openstack:8386/v1.1/$tenantId/plugins/
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2014-08-14 11:13:33 -0600 commented answer Sahara: Error database when reboot server

Thanks alazarev :)

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2014-08-13 12:52:43 -0600 commented answer Sahara: Error database when reboot server

Thanks @alazarev,

After VM restart, if i want restart all processes of hadoop. I will have to run what commands? Because "/etc/init.d/hadoop-* restart" or "service hadoop-* restart" is not running and i can not find the file start hadoop.


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2014-08-13 07:29:49 -0600 commented answer Sahara: Error database when reboot server

Thanks @dmitrymex,

I did as you said: /tmp/sahara.db changed to /home/cloud (example). Then, when start sahara-api, it's worked, that error 's been resolved.

However, when I ssh into the cluster (it was created before rebooting the server). When i run the job, message:

14/08/13 11:33:12 INFO ipc.Client: Retrying connect to server: demo-cluster-01-aio-node-001/ Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
java.lang.RuntimeException: Call to demo-cluster-01-aio-node-001/ failed on connection exception: Connection refused

If i create a new cluster, it run nomally.