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Part 1: Openstack TripleO Architecture and Step By Step Guide for installation of undercloud and overcloud nodes (compute, controller, ceph-storage)

In the article we will cover below topics Undercloud Overcloud TripleO architecture Undercloud Director Virtual Machine Validate FQDN of the undercloud director Register your undercloud node Installing the Director Packages Creating user for undercloud deployment Configure undercloud deployment parameters Deploy the undercloud You can also configure a HA cluster on your Openstack setup and move … Read more

What is paranoia mode in nscd?

This variable can be used in nscd.conf file if you wish nscd daemon to restart itself after a provided amount of time interval. This argument is used in combination with “restart-interval”Open nscd.conf in edit mode # vi /etc/nscd.conf # enable paranoia for One NDS for 1h restart interval paranoia … Read more

Understanding nscd daemon for hosts cache

nscd stands for Name Service Cache Daemon and is used to provide cache for common name service request. For providing hosts cache nscd daemon uses /etc/hosts file as it’s database and any changes made to the database is immediately noticd ny nscd and it will flush the cache once these are changed. However, this will … Read more

Why is Linux considered more safer than windows or any other OS ?

Now we hear many times from most of the people around us claiming that Linux is much more secure than Windows or Linux is very secure. But what are the things in Linux that makes it secure than Windows or any other Operating System. Here I will try to throw some light on some of … Read more

What is umask and how to change the default value permanently?

In my last article I had shared the steps to assign permission to individual user even if the umask denies access to a file. umask is a command that determines the settings of a mask that controls which file permissions are set for files and directories when they are created. Octal Symbolic Octal method … Read more

Understanding Partition Scheme MBR vs GPT

In this article I will try to explain the most basic and common things about partitions and partition scheme which one should know as it will be used on your day to day life if you are a system administrator. To start of lets start with the most basic question What is a partition? Partition … Read more