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 instrument (with a number of different methods up its sleeve). This publication is helping these conversant in the command line and easy shell scripting commence utilizing Ansible to provision and deal with wherever from one to hundreds of thousands of servers.
The booklet starts off with basics, like fitting Ansible, developing a simple stock dossier, and simple recommendations, then courses you thru Ansible's many makes use of, together with ad-hoc instructions, easy and complex playbooks, software 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 resources for Ansible for DevOps: Server and configuration management for humans
However, filenames must be unique for this to work, so it’s not as useful when copying down files from multiple hosts. Only use flat=yes if you’re copying files from a single host. Chapter 3 - Ad-Hoc Commands 35 Create directories and files You can use the file module to create files and directories (like touch), manage permissions and ownership on files and directories, modify SELinux properties, and create symlinks. Here’s how to create a directory: $ ansible multi -m file -a "dest=/tmp/test mode=644 state=directory" Here’s how to create a symlink (set state=link): $ ansible multi -m file -a "src=/src/symlink dest=/dest/symlink \ owner=root group=root state=link" Delete directories and files You can set the state to absent to delete a file or directory.
You could also specify special time values like reboot, yearly, or monthly using special_time=[value]. You can also set the user the job will run under via user=[user], and create a backup of the current crontab by passing backup=yes. What if we want to remove the cron job? 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.
The past decade has seen the growth of many virtualization tools that allow for flexible and very powerful infrastructure emulation, all from your local workstation! 9 Chapter 2 - Local Infrastructure Development: Ansible and Vagrant 10 It’s empowering to be able to play around with a config file, or to tweak the order of a server update to perfection, over and over again, with no fear of breaking an important server. 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.