![]() This makes it possible to use shell-specific features and functions such as pipe |, redirection, >, and others. ![]() Unlike the command module, shell module does not execute directly on the target but in a shell environment on the target. Next, let’s define some cases where we should prefer one over the other. Previously, we discussed in detail the usage of shell and command modules and went through various examples. Here’s a basic example showcasing how to leverage the command module in a task: When using the command module, you can be sure the command will execute exactly as you’ve written it, without any unexpected side effects from shell processing. This behavior makes the command module safer and more predictable than the shell module that we will discuss later. This means that variables like $HOSTNAME won’t work, and shell-specific functions like piping commands and redirection operators (, >, |, etc.) won’t be interpreted correctly. It’s important to note that commands aren’t processed through the local shell with the command module. If you are targeting Windows nodes, use the _command instead. It’s one of the most straightforward modules it takes the command name followed by a list of space-delimited arguments. The command module in Ansible executes commands on all selected hosts. We’ve already seen the shell module, and next, we will look at the command, expect, script, and raw modules for this purpose. ![]() Ansible provides several ways to execute commands on remote nodes. We can use Ansible to execute commands directly on remote hosts in these cases. On some occasions, you might not be able to leverage any task-specific module to achieve your desired outcome. Ansible modules can report whether they made a change on the remote system, which helps to understand better changes performed to the targeted systems. If something goes wrong, they often provide helpful error messages to aid in troubleshooting and are safer to use than arbitrary shell commands, which can inadvertently open up security risks. Task-specific Ansible modules are designed to be idempotent and to abstract away the underlying complexities of tasks, which makes them preferable to directly executing commands via the shell or command modules, for example.Įven more, specialized modules handle errors gracefully. We generally prefer using specialized Ansible modules over raw shell or command scripts.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |