Cassandra is one the popular and robust distributed database management system. It is known for providing high availability with no single point of failure. It has one of the awesome feature that is asynchronous replication between multiple nodes without requiring master nodes. While working on Cassandra cluster, I was introduced with terms called Data Center…
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The post explains a useful sed command trick to remove all lines between two keywords. The lines which has these keywords will also be removed. The below given command will show you the output on terminal and do not make any changes inside the file. So it is safe to use as preview output. sed…
In this post we will install php 5.4 on CentOS 6 with yum command . In available default repo of CentOS, we will get the php 5.3 version. Some PHP developers uses the PHP 5.4 version for application, hence we need PHP 5.4 to be installed on CentOS 6.x . It is known that in…
In this post, we will learn command to attach security groups to existing instance with AWS cli. Working with command line is always fun. We can use the command in our scripts which also help us to do automation work. Requirement : 1. AWS cli must be installed on system 2. Access and secret keys…
In this post we will learn, how we can upgrade to Cent 6.6 from CentOS 6.x series. By this method, you can upgrade from CentOS 6.0/6.1/6.2/6.3/6.4/6.5 . Doing regularly update is recommended practice. Whereas we have to check and consider many things.Hence, before upgrading to CentOS 6.6 we highly recommend you to read the release…
This is a quick post on how to enable verbose mode while gem install of package. When we install package with gem command, it takes time to fetch the spec file from site . We require the verbose mode to check the progress of installation. It helps in troubleshooting in case there is any problem…
Elasticsearch is a popular search server based on Lucene. It is well developed in Java and with awesomeness of Open source, it is available to all. In this tutorial we will talk about how to install and configure elasticsearch cluster on Ubuntu 14.04 LTS. Details Of Elasticsearch Cluster Architecture Operating System : Ubuntu 14.04 LTS…
In this tutorial we will learn , how to install and set Java on Ubuntu 14.04 LTS with tar ball. Currently on Oracle official site the .deb package is not available. We will first download the JDK tar package and then simply set the environment. Steps to set Java environment is same with Debian, Ubuntu,…
Whenever we transfer the files from Windows to Linux / Unix system generally it has CONTROL-M character inside. Which appears as ^M inside the files . To prevent this you can first copy paste the content in notepad then again copy to file in linux system. Here, notepad will help you to transfer the ASCII character.
Learn how to Install Maxthon cloud browser on Ubuntu. It is very easy to install. Browser like Firefox, google Chrome, Opera this is also another Web browser.
In this tutorial we will learn simple bash script to prompt user yes / no for confirmation. It means when user run the script, it will first ask user to confirm by typing yes or no. Once user confirm it take appropriate action. Whereas in case, the user type apart of yes/no , it will…
When we launch a new EC2 instance in AWS Cloud , to access the server we need the ssh keys. In EC2 instances password are not set , we have to use ssh key to get access whereas keys are based on public–key cryptography. Here, we are quickly going through with creating/removing/listing the ssh keys…
Today, we are sharing a quick tip on AWS cloud computing. We will learn how to set Name of EC2 instance by aws cli. This task you can also do through AWS console dashboard but as a System Administrator it is good practice to use command line. At present AWS is top Cloud Computing provider….
We have recently wrote a post on Protect ssh with Google Authenticator on Ubuntu 14.04 LTS . After writing the post, we were determined to share info on the Google Authenticator Apps for Linux / Windows / Smart Phones / Web Browsers. Google Authenticator apps is used for generating codes even you are not connected…
The tutorial is about how we can protect ssh with Google Authenticator on Ubuntu 14.04 LTS server . Google authenticator is a security application which implements time based one time password (TOTP) security tokens. It is often also called as “Two steps verification” . The server in which Google Authenticator has been setup , to…