KVM images – maintenance guidelines

KVM images – maintenance guidelines

This document will list the guidelines for maintaining kvmimages.

kvm images are generally qcow2 formatted images that are precreated and used as base images for all types of setups across nCodeIT environments.

Such an image is called Golden Image.

currently Golden Images are available for multiple OSes.

ncd-centos7x86gimgv2-280618.qcow2  –  Golden Image  for – CentOS7 , X86_64, Version 2 , created on 28th June 2018.

ncd-centos7x86gimgv2-280618.meta – each image will also have a .meta file with the same name.  meta file will have information related to qcow2. The meta file will also have information on Integrity Checks. And how to use that qcow2 image.

No setup should use , unapproved images.

VM launching and base image :

All activities in nCodeIT should be done on the approved ncodeit custom images only.

Naming Method for any images :

Golden Images are for Operating Systems only.

Specific products/softwares are installed on top of these Golden Images.

For eg: tomcat9 can be installed on CentOS7 golden images

Puppet5 can be installed on CentOS7 golden image

jdk+tomcat9+puppet5 can be installed on CentOS7 golden image.

After installing the software an image will be taken again.

Such image is named as

ncd-<golden-image-details>-<software-details-with-version>-<version-of-image>-<date-of-creation-of-image>.qcow2

Eg:   ncd-centos7x86gimgv2-puppet552-agent-v1-070718.qcow2

Above image is

Golden Image – CentOS7 , X86, gimg (golden image) , Version 2

software – Puppet 5.5.2  Agent

Image version – Version 1

created on – 07th July 2018.

A meta file   ncd-centos7x86gimgv2-puppet552-agent-v1-070718.meta will exist at the same location as the image. This meta file will have complete information about the qcow2 image.

Read the meta file completely before proceeding to use any qcow2 image.

Locations Of Images

There are 3 locations for Images.

1 2 3 4 5 6 7

Location 1  - Hyderabad Data Center  ( 192.168.12.142:/home/ncdftp/kvmimages ) Location 2 - Bangalore Data Center    ( 192.168.22.14:/home/ncdftp/kvmimages ) Location 3 - Ground Zero (G0) Data center.  ( 192.168.6.41:/home/ncdftp/kvmimages ) Location 4 - Cloud -                                           (193.200.241.161:/home/ncdftp/kvmimages )

Important Guidelines About Image Servers :

1.  All image servers will allow upload/download of the images ( check the channel for login information)
2.  For high speed upload/download , Jobseekers should try to upload/download images from the server that is nearest to their location.
3. Look at the location of source and destination to decide the best server for upload/download. Eg. If you are transferring an image between two servers location in Hyderabad, its best to choose Hyderabad data center
4. If you are not sitting at any of the locations, and are connected thru internet, the best server is cloud server.

For any clarifications or login details please post your queries to the channel.