By Daniel Hall
Leverage the ability of Ansible to control your infrastructure efficiently
About This Book
- Configure Ansible in your Linux and home windows machines effectively
- Extend Ansible so as to add beneficial properties resembling looping, conditional executions, and job delegations
- Explore the services of Ansible from easy to extra complicated subject matters with the aid of this step by step guide
Who This e-book Is For
This publication is meant for a person who desires to examine Ansible ranging from the fundamentals. a few adventure of ways to establish and configure Linux machines and a operating wisdom of BIND, MySQL, and different Linux daemons is expected.
What you'll Learn
- Manage your home windows machines with Ansible
- Use Ansible's command-line instruments to interrogate systems
- Interact with modules and install cloud infrastructures
- Process information within Ansible and expand the performance of Ansible
- Learn the right way to shop secrets and techniques in Ansible's vault and notice different resource code administration techniques
- Build maintainable configurations for big environments
- Write customized Ansible plugins efficiently
- Extend the performance of Ansible through writing your individual modules
Ansible is an open resource software program platform for configuring and coping with pcs. It offers a transparent and concise method to deal with the configuration of your Linux infrastructure. This booklet is a step by step consultant that gives you with the data you require to successfully deal with your platforms in an easy, quickly, and maintainable manner, with real-world examples.
You will start by way of studying the fundamentals of Ansible after which circulation directly to exploring extra complicated themes. you are going to then examine the elemental and complicated operations of playbooks and engage with modules to control home windows machines and install them. additionally, you will get accustomed to Ansible's extra complicated gains akin to serially updating machines, delegating projects to different machines, complex makes use of of variables, looping and prerequisites, copying entire directories, and utilizing filters to method variables. in the direction of the top of the publication, you'll the way to bring up the performance of Ansible itself by way of writing your personal modules and plugins.
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Additional info for Ansible Configuration Management
The value of poll indicates to Ansible how often to poll to check if the command has been completed. If you wanted to run updatedb across an entire cluster of machines, it might look like the following code: - hosts: all tasks: - name: Install mlocate yum: name=mlocate state=installed - name: Run updatedb command: /usr/bin/updatedb async: 300 poll: 10 You will notice that when you run the previous example on more than five machines, the yum module acts differently to the command module. The yum module will run on the first five machines, then the next five, and so on.
Cnf - shadow - fstab In addition to looping over fixed items, or a variable, Ansible also provides us a tool called lookup plugins. These plugins allow you to tell Ansible to fetch the data from somewhere externally. For example, you might want to find all the files that match a particular pattern, and then upload them. ssh/authorized_keys mode: 0600 owner: root group: root Repeating modules can be used in the following situations: • Repeating a module many times with similar settings • Iterating over all the values of a list • Creating many files for later use with the assemble module to combine into one large file • Copying a directory of files when combined with the with_fileglob lookup plugin Conditional execution Some modules, such as the copy module, provide mechanisms to configure it to skip the execution of the module.
The host-pattern-matching features of Ansible were also discussed in the previous chapter. In the next line, the user tells the Ansible playbook which user to connect to the machine as. The other lines that we can provide in this section are as follows: Name sudo Description user This defines the username to connect to the machine originally, before running sudo if configured. sudo_user This is the user that Ansible will try and become using sudo. For example, if we set sudo to yes and user to daniel, setting sudo_user to kate will cause Ansible to use sudo to get from daniel to kate once logged in.
Ansible Configuration Management by Daniel Hall