Download Ansible for DevOps: Server and configuration management for by Jeff Geerling PDF

By Jeff Geerling

Covers Ansible 2.0!

Ansible is an easy, yet strong, server and configuration administration software (with a number of different tips up its sleeve). This publication is helping these acquainted with the command line and easy shell scripting begin utilizing Ansible to provision and deal with anyplace from one to hundreds of thousands of servers.

The publication starts off with basics, like fitting Ansible, establishing a simple stock dossier, and easy suggestions, then courses you thru Ansible's many makes use of, together with ad-hoc instructions, uncomplicated and complex playbooks, software deployments, multiple-provider server provisioning, or even Docker orchestration! every little thing is defined with pertinent real-world examples, usually utilizing Vagrant-managed digital machines.

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Sample text

The major difference is that files will be copied down to the local dest in a directory structure that matches the host from which you copied them. For example, use the following command to grab the hosts file from the servers: $ ansible multi -s -m fetch -a "src=/etc/hosts dest=/tmp" Fetch will, by default, put the /etc/hosts file from each server into a folder in the destination with the name of the host (in our case, the three IP addresses), then in the location defined by src. 6/etc/hosts. You can add the parameter flat=yes, and set the dest to dest=/tmp/ (add a trailing slash), to make Ansible fetch the files directly into the /tmp directory.

We’ll get into the details of Ansible playbooks later, but for now, we’re going to edit our Vagrantfile to use Ansible to provision our virtual machine. Open the Vagrantfile that was created when we used the vagrant init command earlier. Add the following lines just before the final ‘end’ (Vagrantfiles use Ruby syntax, in case you’re wondering): 1 2 3 4 # Provisioning configuration for Ansible. yml" end This is a very basic configuration to get you started using Ansible with Vagrant. There are many other Ansible options⁴⁷ you can use once we get deeper into using Ansible.

To ensure you have a good idea of your servers’ past and present resource usage! in. 23 Chapter 3 - Ad-Hoc Commands Discover Ansible’s parallel nature First, I want to make sure Vagrant configured the VMs with the right hostnames. Use ansible with the -a argument ‘hostname’ to run hostname against all the servers: $ ansible multi -a "hostname" Ansible will run this command against all three of the servers, and return the results (if Ansible can’t reach one a server, it will show an error for that server, but continue running the command on the others).

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