To accomplish this example we are going to use two commands together so we must opt to shell module. In the earlier versions of ansible there is an option named as sudo deprecated , Since ansible 2. In this example, we are going to access one of the privileged configuration files. Using SUDO module deprecated and will be removed in ansible 2. Using become module. Here we are creating a user name group named weblogic using the ansible group module, the same task can be reversed to delete the group if you change the state to absent.
In this example, we are going to create a new directory with permisssion this is done using the ansible file module. In this example, we are going to change the ownership of the file using ansible ad hoc command with ansible file module. Most of us would like to quickly check the disk space of many machines with a single command. You really do not have to log in to start or stop the service running in your Linux system.
These are set of commands you have to execute to install the Django application server and Mysql libraries. We can easily manage the Cron jobs with Ansible cron module. Here are the list commands you can keep handy. By Default the polling interval is 10 seconds, but can modify it using -P option. In this example we are going to reboot the remote system using the shell module and Poll 0, it represents fire and forget.
To know more about Ansible async and poll refer this article. Here is the execution output of this ad hoc command. This directory was created with the fetch operation. You can check the directory structure of this directory:. Now I am sure most users wouldn't want this entire directory structure to be downloaded when all we want is just a file. In this section I will share the ansible ad hoc commands examples to create a file or directory on the managed nodes i. This can help you take backup of any configuration file before performing any configuration changes.
The command has executed successfully. We can see a couple of default values which has been applied to the new file such as gid , group , mode , owner etc. We also have the flexibility to define a mode for the new file which we create. To remove a file we will use " absent " module with following ansible ad hoc commands syntax :. Let's use this syntax to delete one of the files we created earlier:. We can use the file module to also create a new directory but with a slightly different syntax as follows:.
Let's use this in an example:. By default, umask value from server2 is considered to create the directory but again you can modify the modes and permission while creating the directory as we did for the file earlier. We will again use the absent as the state with file module to delete the directory with following syntax:.
Output from my controller node: :. In all the examples we learned till now was performed as ansible user. But what if you try to execute a command which requires root level privilege. Let's try to check the available partitions and storage devices using " fdisk -l " command which can only be executed as root user:. We have got permission denied error as " fdisk -l " command can be executed only as root user.
In such case we must use -b or --become to execute the command with sudo privilege. For example, using double rather than single quotes in the above example would evaluate the variable on the box you were on. An ad hoc task can harness the power of Ansible and SCP to transfer many files to multiple machines in parallel. To transfer a file directly to all servers in the [atlanta] group:.
If you plan to repeat a task like this, use the ansible. The ansible. These same options can be passed directly to the copy module as well:. The file module can also create directories, similar to mkdir -p :. You might also use an ad hoc task to install, update, or remove packages on managed nodes using a package management module like yum. To ensure a package is installed without updating it:. Ansible has modules for managing packages under many platforms. If there is no module for your package manager, you can install packages using the command module or create a module for your package manager.
Privilege Escalation File Transfer 1. Upload File to Host 2. Install Package 2. Remove Package 3. Autoremove Manage Services 1. Start Services 2. Restart Service 3. Stop a Service Checking the System 1. Disk Available 2. RAM Memory Usage 3. CPU Usage 4. Open Ports 5. Suggested articles. Hi Arul, Thanks for useful info. What is "hakase-testing" in the command. By: New Devops learner.
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