What is host vars in Ansible?
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What is host vars in Ansible?
hostvars is a hash with inventory hostnames as keys. To access fields of each host, use hostvars[‘test-1’] , hostvars[‘test2-1’] , etc. ansible_ssh_host is deprecated in favor of ansible_host since 2.0.
How do you call an Ansible VARS file?
The include_vars module can be used in a playbook or role to load variables from a file. Simply set the value of include_vars to a local file to load the variables it contains: — # ./hello_world. yml – name: print greeting hosts: “*” tasks: – include_vars: name_vars.
How do I make an Ansible host file?
Two or more Ansible Hosts: two or more remote Ubuntu 20.04 servers.
- Step 1 — Creating a Custom Inventory File.
- Step 2 — Organizing Servers Into Groups and Subgroups.
- Step 3 — Setting Up Host Aliases.
- Step 4 — Setting Up Host Variables.
- Step 5 — Using Patterns to Target Execution of Commands and Playbooks.
Where is host file Ansible?
/etc/ansible/hosts
The default location for the inventory file is /etc/ansible/hosts. You can also create project-specific inventory files in alternate locations. The inventory file can list individual hosts or user-defined groups of hosts.
What is the use of group host Vars?
It uses hosts file and group_vars directory to set variables for host groups and deploying Ansible plays/tasks against each host/group. Files under group_var directory are named after the host group’s name or all, accordingly, the variables will be assigned to that host group or all the hosts.
How do you pass variables in Ansible playbook?
To pass a value to nodes, use the –extra-vars or -e option while running the Ansible playbook, as seen below. This ensures you avoid accidental running of the playbook against hardcoded hosts.
How do I see Ansible hosts?
You can use the option –list-hosts. It will show all the host IPs from your inventory file.
How do I use Ansible playbook on remote host?
It is possible to have ansible installed on the remote machine and run it there, not just from your local machine connecting to the remote machine. Your hosts file will need to use localhost , and whenever you run playbooks with ansible-playbook -i hosts playbook. yml , you will need to add -c local to your command.
What is inventory Host_vars and Group_vars in Ansible?
The host_vars is a similar folder to group_vars in the repository structure. It contains data models that apply to individual hosts/devices in the hosts. ini file. Hence, there is a YAML file created per device containing specific information about that device.
What is the difference between roles and playbook in Ansible?
Playbooks and roles are similar. Different at the same time. A playbook is a standalone file that Ansible can run that contains all of the information required to set a machine’s state to what you expect. A playbook can contain variables, tasks, handlers, roles, and even other playbooks, all in the same file.
How do you pass multiple vars in Ansible?
To solve this issue, we can use the Ansible extra vars feature. We can define a variable representing the hosts’ group and specify its value when running the playbook. Now that we have an example playbook as above, we can pass the value to the “group” variable using the –extra-vars option while running the playbook.
What is Host_vars and Group_vars in Ansible?
What is Remote_user in Ansible?
remote_user is the account that logs into the machine ( ssh vagrant@tmp_ansible_test_vm would have vagrant as the remote user). If this user is going to do perform tasks as root or another user, it should have sudo permissions (i.e., be added to the wheel group on CentOS).
Does Ansible need to be installed on remote host?
Ansible is agent-less, that means no need of any agent installation on remote nodes, so it means there are no any background daemons or programs are executing for Ansible, when it’s not managing any nodes.
How do I run Ansible Yaml file?
- Run Your First Command and Playbook. Install Ansible. Establish a manual connection to a managed node. Run your first network Ansible command. Create and run your first network Ansible Playbook.
- Use Ansible network roles.
- Beyond the basics.
- Working with network connection options.
- Resources and next steps.
What is the difference between Group_vars & Host_vars directory?
When should I use role vs Playbook?
playbooks organize and launch tasks. roles organize bunches of tasks, handlers, etc that perform a particular function. Some playbook is needed to launch the role (s).
Can there be n number of plays inside a playbook?
A playbook can have ‘n’ number of plays in a list. In the following example, the first play has set of tasks for ubuntu servers and the second for centos servers.
How do you use extra vars in Ansible-playbook?
Ansible treats values of the extra variables as strings. To pass values that are not strings, we need to use JSON format. To pass extra vars in JSON format we need to enclose JSON in quotation marks: ansible-playbook extra_var_json.
