Posted in Cloud, Linux, Openstack

Basic Cinder (volume) service functionality in Openstack – Part1

In this post I am going to show you basic functionality of openstack cinder (volume) service functionality by creating volume on internal storage. Attaching that volume to VM. Create partition on that volume in client machine and test partition remove and detaching volume from VM.

Lets take one running state vm for cinder testing as we can do this operation on the fly. I have one VM name testvm.

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Check the disk and partitions on the VM. I can access the testvm using private IP and public IP. Lets access it using private IP using unique network namespace.

First check private-net network ID and test the ping to private IP of VM using network namespace. For more details about basic networking in openstack check my last blog posts.

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Posted in Linux

Manage local Users and Groups in Centos 7/RHEL 7

1.  To create user use command useradd.

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2. Whenever new user is created without specifying any other values then default values will be taken after creating user. You can check default values for any user creation using following commands.

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user chris is created with id 1001 and user private group created named chris with 1001 group id (the group created with same name as user is called user private group).

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Posted in Linux

How to turn off GUI screen lock on rhel 7/centos 7

It was very annoying when I work on rhel 7 and screen gets locked when it was idle for some period and again I have to logged in from virtual box and then on server. I search on web to turn off screen lock on rhel 7 and it was hard to find out.
rhel 7 have different options to turn off screen than in previous versions.
So I thought to create this post so that people can easily turn off their screen lock without wasting their time searching for it.

1. Open the rhel 7 GUI. In Applications go to System Tools.5

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