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

By Jeff Geerling

Covers Ansible 2.0!

Ansible is a straightforward, yet robust, server and configuration administration software (with a couple of different tips up its sleeve). This publication is helping these acquainted with the command line and uncomplicated shell scripting begin utilizing Ansible to provision and deal with at any place from one to millions of servers.

The publication starts off with basics, like fitting Ansible, establishing a easy stock dossier, and uncomplicated recommendations, then courses 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 thing is defined with pertinent real-world examples, usually utilizing Vagrant-managed digital machines.

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Example Suppose you’re running a pipeline of commands cmd1, cmd2, and cmd3: $ cmd1 | cmd2 | cmd3 > file1 This sequence puts the ultimate output of the pipeline into file1. However, you may also be interested in the intermediate result of cmd1. 12117 Page 45 Tuesday, October 9, 2001 1:46 PM The results in file1 will be the same as in the original example, and the intermediate results of cmd1 will be placed in file_cmd1. Objective 5: Create, Monitor, and Kill Processes Processes Each program running on your system is considered to be a process by the kernel.

Your shell is a process, and each command you type into the shell starts one or more processes during its execution. Attributes and concepts associated with processes include: Lifetime Each process “lives” as it executes. Short commands such as ls will execute for a very short time, generate results, and terminate on their own. User programs such as web browsers run for extended periods until terminated by the user. Daemons such as web servers run continuously from boot to shutdown or restart.

The tee utility is helpful in this situation. tee Syntax tee [options] files Description Read from standard input and write both to one or more files and to standard output (analogous to a tee junction in a pipe). Option –a Append to files rather than overwriting them. Example Suppose you’re running a pipeline of commands cmd1, cmd2, and cmd3: $ cmd1 | cmd2 | cmd3 > file1 This sequence puts the ultimate output of the pipeline into file1. However, you may also be interested in the intermediate result of cmd1.

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