Redis HA Implementation Options

This is high level description of Redis HA Implementation Options. There are couple of ways to setup Redis in HA mode as per business requirements. Main concern in Redis HA is how we are going to distribute Writes and Reads. Sometimes RedisHA is handled at Application level as well. Option 1: Manual This is the…

HowTo: Add CentOS7 machine to Windows AD

Microsoft Active Directory(AD) is widely used in Enterprise for Centralized Authentication, Pushing Security related Policies, etc. Administrator may need to add CentOS7 machines to AD to use same user credentials. This blog will provide steps to add CentOS7 Linux machine to AD. There are multiple ways to achieve this and it is one of the way.…

Linux: Troubleshooting Filesystem Full issue due to open files

We face filesystem Full issue in our day to day Linux Administration. This issue is mainly related with /var, /home filesystems. If both are in / filesystem then it will impact / filesystem as well. When we face this type of issue, our first solution is to delete or truncate log files, temp files, hidden…

Install Ansible 2.x and Manage Windows Machines

This notes contains steps to install Ansible 2.x on Ubuntu 14.04 server and manage Windows Server. – Install git – Clonning git repo – Install Development Tools – Setup Ansible Environment Note: Add above lines in your ~/.bashrc – Create Ansible Configuration File – Create Ansible group variables   Note: As we are storing password…

Ansible Basics

Introduction Ansible is an IT automation tool. It can be used to deploy applications, configure services on multiple servers in less efforts. It works agentless using SSH for connection. Configuration files are written in YAML and file extension is yml Ansible has controller machine in which Ansible is installed and all playbooks, required templates, files…

Floating IPs with Digital Ocean !

Hurrey !! Digital Ocean Guys Rocks again! Now Digital Ocean have implemented Floating IP service. As per previous services from DO the beauty of the service is easiness. It is very essential service for High Availability cloud solutions. Even Pro Cloud organizations like AWS also does not provide such services in easy way. Hats Off…

LinuxAcademy.com ! Certification Trainings !

With 1,871 videos, obtain experience you need as you learn and practice on your lab servers, provided by the Linux Academy, to master the concepts. All of our courses are self-paced, so work at your convenience, at a speed that is comfortable for… LinuxAcademy.com is really an awesome place to learn Linux and Cloud related…

Setting up Cassandra using Datastax OpsCenter

CassandraDB is basically distributed Database system and used to deal with huge Data. To setup Cassandra cluster, we can use Datastax OpsCenter community tools or enterprise edition. It is the easiest way to manage Cassandra cluster graphically.In this case major Components of Cassandra cluster are: 1. OpsCenter for Managing Cassandra Cluster 2. Datastax Agent 3.…

Exim Mailqueue Monitoring Script

This script will count number of mails in queue and validate with threshold value. If it is more than it will send an email using thirdparty tool called SendEmail. One important point to note, that is we need to use SMTP hosted on other server. Thats why we are using SendEmail perl script. We need…

Configure Mail Notification with icinga2

Configuring Mail Notification in Icinga2 is very easy. We will use third party SMTP to send email notifications using thirdparty tool “sendEmail.pl”. sendEmail.pl is Perl script which send email to mailserver to send email. /etc/icinga2/scripts/mail-service-notification.sh : This script actually does work of sending emails. By default it uses inbuild “mail” utility. /etc/icinga2/users.conf: This conf file has user…