Category: Ansible

Ansible – Ad hoc Commands ”; Previous Next Ad hoc commands are commands which can be run individually to perform quick functions. These commands need not be performed later. For example, you have to reboot all your company servers. For this, you will run the Adhoc commands from ‘/usr/bin/ansible’. These ad-hoc commands are not used for configuration management and deployment, because these commands are of one time usage. ansible-playbook is used for configuration management and deployment. Parallelism and Shell Commands Reboot your company server in 12 parallel forks at time. For this, we need to set up SSHagent for connection. $ ssh-agent bash $ ssh-add ~/.ssh/id_rsa To run reboot for all your company servers in a group, ”abc”, in 12 parallel forks − $ Ansible abc -a “/sbin/reboot” -f 12 By default, Ansible will run the above Ad-hoc commands form current user account. If you want to change this behavior, you will have to pass the username in Ad-hoc commands as follows − $ Ansible abc -a “/sbin/reboot” -f 12 -u username File Transfer You can use the Ad-hoc commands for doing SCP (Secure Copy Protocol) lots of files in parallel on multiple machines. Transferring file to many servers/machines $ Ansible abc -m copy -a “src = /etc/yum.conf dest = /tmp/yum.conf” Creating new directory $ Ansible abc -m file -a “dest = /path/user1/new mode = 777 owner = user1 group = user1 state = directory” Deleting whole directory and files $ Ansible abc -m file -a “dest = /path/user1/new state = absent” Managing Packages The Ad-hoc commands are available for yum and apt. Following are some Ad-hoc commands using yum. The following command checks if yum package is installed or not, but does not update it. $ Ansible abc -m yum -a “name = demo-tomcat-1 state = present” The following command check the package is not installed. $ Ansible abc -m yum -a “name = demo-tomcat-1 state = absent” The following command checks the latest version of package is installed. $ Ansible abc -m yum -a “name = demo-tomcat-1 state = latest” Gathering Facts Facts can be used for implementing conditional statements in playbook. You can find adhoc information of all your facts through the following Ad-hoc command − $ Ansible all -m setup Print Page Previous Next Advertisements ”;

Ansible Tutorial PDF Version Quick Guide Resources Job Search Discussion Ansible is simple open source IT engine which automates application deployment, intra service orchestration, cloud provisioning and many other IT tools. Audience This tutorial is prepared for the beginners to help them understand the basics of Ansible. It can also help as a guide to engineers. Prerequisites Before you start doing practice with various types of examples given in this tutorial, it is being assumed that you have hands-on experience with running commands into a Linux shell. This will help you the Ansible tasks in a better way. Print Page Previous Next Advertisements ”;

Ansible – Environment Setup ”; Previous Next In this chapter, we will learn about the environment setup of Ansible. Installation Process Mainly, there are two types of machines when we talk about deployment − Control machine − Machine from where we can manage other machines. Remote machine − Machines which are handled/controlled by control machine. There can be multiple remote machines which are handled by one control machine. So, for managing remote machines we have to install Ansible on control machine. Control Machine Requirements Ansible can be run from any machine with Python 2 (versions 2.6 or 2.7) or Python 3 (versions 3.5 and higher) installed. Note − Windows does not support control machine. By default, Ansible uses ssh to manage remote machine. Ansible does not add any database. It does not require any daemons to start or keep it running. While managing remote machines, Ansible does not leave any software installed or running on them. Hence, there is no question of how to upgrade it when moving to a new version. Ansible can be installed on control machine which have above mentioned requirements in different ways. You can install the latest release through Apt, yum, pkg, pip, OpenCSW, pacman, etc. Installation through Apt on Ubuntu Machine For installing Ansible you have to configure PPA on your machine. For this, you have to run the following line of code − $ sudo apt-get update $ sudo apt-get install software-properties-common $ sudo apt-add-repository ppa:ansible/ansible $ sudo apt-get update $ sudo apt-get install ansible After running the above line of code, you are ready to manage remote machines through Ansible. Just run Ansible–version to check the version and just to check whether Ansible was installed properly or not. Print Page Previous Next Advertisements ”;