Ansible uses modules to complete the task on the remote server. The most commonly used command modules are “command”, “shell”, and “raw”. Each module has its own advantages and disadvantages. In Ad-hoc command mode, unless you specify the module name, it uses “command” module by default. In this article, we will see the functionality of […]
Ansible – How to Setup Inventory for Easy Operations ?
In Ansible, Setting up inventory is one of the most important tasks. Ansible can work with multiple servers at the same time but the challenge is how to classify the servers. While setting up Ansible environment, you need to classify the hosts as much a possible using the ansible inventory. For an example, By looking […]
Ansible – How to Prepare and Setup Client Nodes ?
Ansible doesn’t require an agent to push the changes but it needs few configurations on the client side to access the server and perform the tasks without prompting for username/ password/other authentication. I would recommend using non-root user for Ansible setup but ensure that user is consistent across your environment. Let’s setup the servers for Ansible […]
How to Install Ansible Engine on CentOS / RHEL
Installing the Ansible engine and set up the environment is pretty straightforward. Ansible engine can be installed on the majority of Linux flavors which includes CentOS, RHEL, Ubuntu, and Debian but it doesn’t support Windows, Solaris, and AIX. But there are no restrictions to participate as ansible clients. Ansible uses the SSH protocol to manage the Unix and Linux […]
What is Ansible ? How it Works ? Why do we need to use ?
Why do we need Configuration Management tool? Anyone who works as an operations engineer has witnessed a bunch of issues with manual configuration approach and more repetitive tasks which are time-consuming. How many times key resources left the company and new engineer struggle to understand the environment and start performing the tasks without escalation? Server configuration is a […]
Docker Basic Operations – Images and Containers
This article will help you to understand the basic operations of dockers images and containers. Images and containers are two basic components of Docker’s architecture. A container is launched using an image. An image is a fully packed stack which has everything that needed by an application i.e runtime libraries, environment variable, and configuration files. […]
How to Install docker on Redhat Linux (RHEL)- CentOS ?
How to install docker on Redhat Linux (RHEL) and CentOS? How to setup the docker environment to start the first container to start exploring the container world? In this article, we are going to demonstrate the docker community edition deployment on RHEL/CentOS. We will also launch the Docker containers to test the deployment. Docker […]
What is Docker ? How its different from Virtual Machine ?
What is Docker? Docker is a container run time engine. Docker provides the power of operating system using minimal resources. Docker support application development in monolithic situations. In other words, developers can develop the applications, ship the container and deploy it anywhere. The destination could be a virtual machine, physical server or cloud instances (AWS, […]
VxVM – Disk group has no valid configuration copies
Veritas volume manager is robust volume manager software and mostly used on Oracle Solaris, HP-UX and Linux Operating systems. In some cases, after the host reboot, you might get an error that “Disk group has no valid configuration copies” when you try to import the existing Veritas disk group. This error common in SRDF environment […]
Self Managing Kubernetes – Turbonomic 6.1
I have been worked on Unix and then move to Linux, then virtualized Linux Environment using VMware vSphere and now overseeing the journey to cloud-native. Technology just keeps changing and we need to adopt new technologies, make it more efficient and more profitable to the customer. Service-based IT firms and vendors are forced to evolving and innovating to stay […]