Retrieving Container IP/Hostname Dynamically Using Ansible and Configuring a WebServer Inside the Container
Welcome guys! In this article I’ve showed you the way of how one can retrieve container’s IP / Hostname Using Ansible and then Configuring Webserver inside the Container. So, guys get deep dive into it…
What is Ansible?
Ansible is an open source IT configuration management (CM) and automation platform, provided by Red Hat. Ansible is well known for its Configuration Management. Ansible is Python Product. Ansible works on Declarative Approach. Ansible loves to do the repetitive tasks which is very tedious in the Agile World. Ansible works on PUSH mechanism. Ansible is a DevOps tool which basically used to automate the things. Ansible works in the concept of Idempotence-means if the desire already exists then it won’t do that task again. It uses playbook to describe automation jobs. Playbook uses a simple language called YAML. One Playbook can contain one or more Plays.
Ansible is good at automation but if it comes to inventory then there’s come one challenge in Ansible which is Static Inventory. In some situation, we need to update our Inventory manually which is really very time consuming as well as in this Agile World it is very tedious kind of Work. So, here comes the solution to it which is none other than Dynamic Inventory.
What is Dynamic Inventory?
Dynamic inventory is an inventory which can add the the Inventory /Host on the fly from dynamic sources, including cloud sources, by using the supplied inventory script.
Why we need Dynamic Inventory?
Static Inventory doesn’t help when we’ve complex infrastructure ,especially when we keep on installing the Operating System. In that case, Dynamic Inventory takes place.
What is Docker?
Docker is a software which has the capability to launch the Entire Operating System / Container within one second of time span.
What is Apache Web Server?
Apache HTTP Server is a web server that delivers web content through the internet. It is commonly referred to as Apache and after development, it quickly became the most popular HTTP client on the web.
- Ansible installed and configured.
- Docker to be installed.
- Some basics of Ansible is required.
So, lets implement the Practical →
There’s a Python pre-created script that’s available to retrieve the Dynamic Inventory…
Step1: Configuring Ansible Inventory
Step 2: Writing Ansible Playbook that will Configure Yum Repo for Docker, Install the Docker , Then launch the Docker Container for the same.
Here is the Playbook for same
Step 3: Download the Python Scripts.
Download the script in your System. You can download from this location docker.py
First make one separate directory. In my case, I’ve created /etc/dynamic_host/
After Downloading the script, make the scripts executable
chmod +x docker.py
Step 4:Doing some Modification in the script downloaded
After Downloading the files , we need to do some modification to it…
Go inside the file called docker.py using vim command and in the first line itself make some changes. Instead of #!/usr/bin/env python write #!/usr/bin/python3
Now we’re good to go…
Step 5: Retrieving the Tags of the Container using the Dynamic Inventory script of Docker
Step 6: Finally, Retrieving the hosts
ansible all --list-hosts
Step 7: Testing the Webserver
Fetch the IP of your System and the port 9999 and browse it in your browser
Knowing extra is always a Good thing
Step 1: Creating Docker that enables SSH
Ansible uses SSH Protocol to go inside the System for Configuration Management.
Step 2: Building the Docker Image
Step 3: Running the Playbook that will Launch the Container and Dynamically retrieve the IP of Container and then will launch the WebServer over it.
Here is the playbook for same
And here is the output for same:
Step 5: Testing the Webserver
Voila!! Web Server has been successfully Deployed inside the Docker Container..
Hope you find this Blog easy🤞!!
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