LUKI NOTES

Ansible is a reliable configuration management tool. It is shipped with a lot of modules including those provided by the communities. Some modules are essential and come in very handy in everyday tasks. Ansible is pushed-based and works by generating a Python script that will be run on the target server. It means the target server is required to have Python which is also commonly shipped in any Linux distros. package The module is used to manage packages in the target host. It is like running apt , yum , or aptitude . The following snippet is an example of its usage to install the Nginx package using the package manager. tasks: - name: Install Nginx package: name: nginx state: present update_cache: True file It is used to manage files, symlinks, links, or folders on the target host. These are the two examples. tasks: - name: Create a directory file: path: "/home/luki/mydir" state: directory mode: 0750 - name: C...

If we maintain a Linux machine with a low memory capacity while we are required to run an application with high memory consumption, enabling swap memory is an option. Ansible can be utilized as a helper tool to automate the creation of swap memory. A swap file can be allocated in the available storage of the machine. The swap file then can be assigned as a swap memory. Firstly, we should prepare the inventory file. The following snippet is an example, you must provide your own configuration. [server] 192.168.1.2 [server:vars] ansible_user=root ansible_ssh_private_key_file=~/.ssh/id_rsa Secondly, we need to prepare the task file that contains not only the tasks but also some variables and connection information. For instance, we set /swapfile  as the name of our swap file. We also set the swap memory size to 2GB and the swappiness level to 60. - hosts: server become: true vars: swap_vars: size: 2G swappiness: 60 For simplicity, we only check the...