By Jeff Geerling
Covers Ansible 2.0!
Ansible is an easy, yet strong, server and configuration administration instrument (with a couple of different tips up its sleeve). This e-book is helping these accustomed to the command line and easy shell scripting commence utilizing Ansible to provision and deal with anyplace from one to hundreds of thousands of servers.
The ebook starts off with basics, like fitting Ansible, constructing a easy stock dossier, and simple innovations, then courses you thru Ansible's many makes use of, together with ad-hoc instructions, uncomplicated and complex playbooks, program deployments, multiple-provider server provisioning, or even Docker orchestration! every little thing is defined with pertinent real-world examples, frequently utilizing Vagrant-managed digital machines.
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Additional resources for Ansible for DevOps: Server and configuration management for humans
Also, check out the ‘official’ Vagrant Ubuntu boxes on the Vagrant wiki⁴¹. 5. Create a default virtual server configuration using the box you just downloaded: vagrant init geerlingguy/centos7 6. Boot your CentOS server: vagrant up Vagrant has downloaded a pre-built 64-bit CentOS 7 virtual machine (you can build your own⁴² virtual machine ‘boxes’, if you so desire), loaded it into VirtualBox with the configuration defined in the default Vagrantfile (which is now in the folder you created earlier), and booted the virtual machine.
D). Ansible denotes Ansible-managed crontab entries by adding a comment on the line above the entry like #Ansible: daily-cron-all-servers. It’s best to leave things be in the crontab itself, and always manage entries via ad-hoc commands or playbooks using Ansible’s cron module. Chapter 3 - Ad-Hoc Commands 41 Deploy a version-controlled application For simple application deployments, where you may need to update a git checkout, or copy a new bit of code to a group of servers, then run a command to finish the deployment, Ansible’s ad-hoc mode can help.
A simple vagrant up again will re-create it from the base box you originally downloaded. Now that you have a running server, you can use it just like you would any other server, and you can connect via SSH. To connect, enter vagrant ssh from the folder where the Vagrantfile is located. If you want to connect manually, or connect from another application, enter vagrant ssh-config to get the required SSH details. Using Ansible with Vagrant Vagrant’s ability to bring up preconfigured boxes is convenient on its own, but you could do similar things with the same efficiency using VirtualBox’s (or VMWare’s, or Parallels’) GUI.