Ansible — tool designed to automate various tasks, such as managing several hosts simultaneously, changing config files, and deploying applications. In this article, we provide guidance in installing Ansible on CentOS and use It's to simplify routine tasks.
Update OS
A prerequisite for deployment Ansible is updating system.
Execute:
sudo yum update Installing EPEL RepositoryHaving the EPEL repository is required for Ansible installation. Execute this:
sudo yum install epel-releaseAnsible Installation
After obtaining the EPEL repository, proceed to deploy:
sudo yum install ansibleInstallation check
Check the successful deploying :
ansible --versionAn interruption installation prompts user.
Configuring Hosts
After installation, configuration files will be created, which are located in the locations:
- /etc/ansible/hosts — list of hosts to manage
- /etc/ansible/ansible.cfg — directly ansible settings
Host configurations are first before starting Ansible. It is achievable by creating an special inventory file and list hosts in them hosts.
Listing file snippet:
[mc]
server1
server2
[database]
db1
db2The next step is the creation of the so-called playbook. Playbook - a file that describes the order of actions to be performed on the hosts.
Playbook file provide details on operations that will be undertaken. Make file called playbook.yml and then insert to him the following code:
- hosts: mc
tasks:
- name: Install mc
yum:
name: mc
state: present
- hosts: database
tasks:
- name: Install postgresql
yum:
name: postgresql-server
state: present
This plays mc installation on all hosts within the group named mc and Postgresql installations within the database group.
Running it:
ansible-playbook -i inventory playbook.ymlTasks in the playbook will run on every hosts listed within the inventory file.
Conclusion
Ansible may be used in automatic application deployments, managing user groups, copying files, and many other options, which require creating the necessary playbooks and running them on the intended hosts.
Ansible is a potent automation tool, allowing for server management simultaneously. It is easy to install on CentOS and automates various tasks, simplifying server administration.
