Dear Readers,
In this article,we will see Launch 2 Hosts and Set-Up in Inventory File.
What is Inventory file?
- Ansible works against multiple managed hosts in your infrastructure at the same time, using a list or group of lists is known as the inventory.
- The Ansible inventory file defines the hosts and groups of hosts upon which commands, modules, and tasks in a playbook operate.
- The file can be in one of many formats depending on your Ansible environment and plugins.
- The default location for the inventory file is /etc/ansible/hosts.If necessary, you can also create project-specific inventory files in alternate locations.
- The inventory file can list individual hosts or user-defined groups of hosts.
Steps to Follow
- Launch 2 Hosts “Ansible-Node-1” and “Ansible-Node-2”.
- Create a group and mention Hosts Private IP under the group in the Inventory file “/etc/ansible/hosts”.
- Uncomment two files “inventory = /etc/ansible/hosts” and “sudo_user = root” in the ansible configuration file “/etc/ansible/ansible.cfg”.
1. Launch 2 Hosts “Ansible-Node-1” and “Ansible-Node-2”
Check Availability Zone of your Ansible Machine
we can see the Availability Zone “ap-south-1b” of your Ansible machine.
Note
Ansible machine is in ap-south-1b AZ.
we create 2 nodes at the same time by selecting 2 instances in the same Availability Zone “ap-south-1b”.
we need to open SSH and HTTP ports.
Create 2 Nodes “Ansible-Node-1” and “Ansible-Node-2”
Launch Linux EC2 Instance
Check below link to Launch Linux EC2 Instance.
We can see the 2 nodes “Ansible-Node-1” and “Ansible-Node-” which was created earlier.
Whenever we install ansible By default ,we will get two files “ansible.cfg” and “hosts” in the /etc/ansible” directory.
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[root@ip-172-31-6-252 ec2-user]# ls /etc/ansible/ ansible.cfg hosts roles |
2. Create a group and mention Hosts Private IP under the group in the Inventory file “/etc/ansible/hosts”
Copy Private IP of 2 Hosts
Copy Host 1 “Ansible-Node-1” private IP
Copy Host 2 “Ansible-Node-2” private IP
Open the file “/etc/ansible/hosts” and create group “Ktexperts-Nodes-Group” and mention above 2 nodes IP addresses under group.
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[root@ip-172-31-6-252 ec2-user]# vi /etc/ansible/hosts This is the default ansible 'hosts' file. # # It should live in /etc/ansible/hosts # # - Comments begin with the '#' character # - Blank lines are ignored # - Groups of hosts are delimited by [header] elements # - You can enter hostnames or ip addresses # - A hostname/ip can be a member of multiple groups # Ex 1: Ungrouped hosts, specify before any group headers. <span style="color: #ff6600;"><strong>[Ktexperts-Group] 172.31.5.201 172.31.1.221</strong></span> ## green.example.com ## blue.example.com ## 192.168.100.1 ## 192.168.100.10 # Ex 2: A collection of hosts belonging to the 'webservers' group ## [webservers] ## alpha.example.org ## beta.example.org ## 192.168.1.100 ## 192.168.1.110 # If you have multiple hosts following a pattern you can specify # them like this: ## www[001:006].example.com # Ex 3: A collection of database servers in the 'dbservers' group ## [dbservers] |
Note
:wq! —- to quit.
Now on wards ansible server push code to 2 nodes but ansible main configuration file is not recognizing the 2 hosts.
So,we need to uncomment two files in the main configuration file “ansible.cfg”
3. Uncomment two files “inventory = /etc/ansible/hosts” and “sudo_user = root” in the ansible configuration file “/etc/ansible/ansible.cfg”
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[root@ip-172-31-6-252 ec2-user]# vi /etc/ansible/ansible.cfg # config file for ansible -- https://ansible.com/ # =============================================== # nearly all parameters can be overridden in ansible-playbook # or with command line flags. ansible will read ANSIBLE_CONFIG, # ansible.cfg in the current working directory, .ansible.cfg in # the home directory or /etc/ansible/ansible.cfg, whichever it # finds first [defaults] # some basic default values... <span style="color: #ff6600;"><strong>inventory = /etc/ansible/hosts</strong></span> #library = /usr/share/my_modules/ #module_utils = /usr/share/my_module_utils/ #remote_tmp = ~/.ansible/tmp #local_tmp = ~/.ansible/tmp #plugin_filters_cfg = /etc/ansible/plugin_filters.yml #forks = 5 #poll_interval = 15 <span style="color: #ff6600;"><strong>sudo_user = root</strong></span> #ask_sudo_pass = True #ask_pass = True #transport = smart #remote_port = 22 #module_lang = C #module_set_locale = False # plays will gather facts by default, which contain information about # the remote system. # # smart - gather by default, but don't regather if already gathered # implicit - gather by default, turn off with gather_facts: False # explicit - do not gather by default, must say gather_facts: True #gathering = implicit # This only affects the gathering done by a play's gather_facts directive, |
Note
:wq! —- to quit.
Now on wards ansible server push code to 2 hosts automatically by running playbooks.
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