You can migrate any existing standalone role into a collection and host the collection on Galaxy. With Ansible collections, you can distribute many roles in a single cohesive unit of re-usable automation. Inside a collection, you can share custom plugins across all roles in the collection instead of duplicating them in each role’s library/` directory.
You must migrate roles to collections if you want to distribute them as certified Ansible content.
Sometimes you want a task to run only when a change is made on a machine. For example, you may want to restart a service if a task updates the configuration of that service, but not if the configuration is unchanged. Ansible uses handlers to address this use case. Handlers are tasks that only run when notified. Each handler should have a globally unique name.
Collections are a distribution format for Ansible content. You can use collections to package and distribute playbooks, roles, modules, and plugins. You can publish and use collections through Ansible Galaxy.
Ansible is an open-source IT automation software that automates the IT infrastructure. It creates an automated and consistent IT environment which makes IT task much easier and faster. Such an environment is self-regulating that can manage all the IT services without using any additional agent. It set up an automated environment for server, OS, Application and other IT services and configures them for better access. It also manages the deployment of any application on the system. Ansible uses to configure a variety of IT materials such as network devices, servers, database storage, cloud infrastructure, firewall, and any other virtual/physical platform. It automates the administrator’s task and allows fast access to various IT services. Ansible uses YAML language that describes system configuration to manage the IT services.
Ansible provides feature named handlers, which is like a task but will only run when called by a notifier in another task. This feature is important because your requirements for running a task may depend on the state of a service, existence of a file or a follow up tasks when state changed. We can make use of variables in notify and handlers which makes it more flexible. Ansible Handlers are used extensively in production and live environments as you always depend on something else to decide whether a task should run or not.
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