By Jeff Geerling
Covers Ansible 2.0!
Ansible is a straightforward, yet strong, server and configuration administration device (with a number of different tips up its sleeve). This booklet is helping these acquainted with the command line and uncomplicated shell scripting commence utilizing Ansible to provision and deal with wherever from one to hundreds of thousands of servers.
The publication starts off with basics, like fitting Ansible, developing a easy stock dossier, and uncomplicated suggestions, then publications you thru Ansible's many makes use of, together with ad-hoc instructions, easy and complicated 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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Extra info for Ansible for DevOps: Server and configuration management for humans
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. Managing this virtual server is extremely easy: vagrant halt will shut down the VM, vagrant up will bring it back up, and vagrant destroy will completely delete the machine from VirtualBox.
Check log files Sometimes, when debugging application errors, or diagnosing outages or other problems, you need to check server log files. ) works through the ansible command, with a few caveats: Chapter 3 - Ad-Hoc Commands 39 1. Operations that continuously monitor a file, like tail -f, won’t work via Ansible, because Ansible only displays output after the operation is complete, and you won’t be able to send the Control-C command to stop following the file. Someday, the async module might have this feature, but for now, it’s not possible.
If you use a local virtual machine, there’s no downtime for a server rebuild; just re-run the provisioning on a new VM, and you’re back up and running in minutes—with no one the wiser. Vagrant³⁵, a server provisioning tool, and VirtualBox³⁶, a local virtualization environment, make a potent combination for testing infrastructure and individual server configurations locally. Both applications are free and open source, and work well on Mac, Linux, or Windows hosts. We’re going to set up Vagrant and VirtualBox for easy testing with Ansible to provision a new server.