Okteto Cloud gives you free access to secure Kubernetes namespaces, fully integrated with remote development capabilities. Develop your Kubernetes applications in Okteto Cloud and forget about slow and tedious local development forever.
This tutorial will show you how to create an account in Okteto Cloud and how to develop a Python sample application.
Get a local version of the Python Sample App by executing the following commands:
git clone https://github.com/okteto/python-getting-started
k8s.yml file contains the Kubernetes manifests of the Python Sample App. Deploy a dev version of the application by executing:
kubectl apply -f k8s.yml
deployment.apps "hello-world" created
Open your browser and go to the URL of the application. You can get the URL by logging into Okteto Cloud and clicking on the application’s endpoint:
Did you notice that you are accessing your application through an HTTPs endpoint? This is because Okteto Cloud will automatically create them for you when you deploy your application. Cool no 😎?
We are going to use the dev version of the Python Sample App we just deployed as our remote development environment. To do that, run the following command:
✓ Development environment activated
okteto up command starts a remote development environment, which means:
okteto/python:3. This image contains the required dev tools to build, test, debug and run a Python application.
All of this (and more) can be customized via the
okteto.ymlmanifest file. You can also use the file
.stignoreto skip files from file synchronization. This is useful to avoid synchronizing virtual environments or git metadata.
Working in your remote development environment is the same as working on your local machine. You first create your virtual environment using the remote shell:
python3 -m venv venv
pip install -r requirements.txt
Collecting Click==7.0 (from -r requirements.txt (line 1))
Using a virtual environment in your development environment has two great benefits: You don’t need to rebuild your docker image every time you add new dependencies, and the virtual environment will be cached and restored automatically when you relaunch your development environment.
And then start the application:
Starting hello-world server...
app.py file in your favorite local IDE and modify the response message on line 7 to be Hello world from the cluster!. Save your changes.
Okteto will synchronize your changes to your development environment in Kubernetes. Flask’s auto-reloader will detect the changes automatically and restart the application with the new code.
* Detected change in '/okteto/app.py', reloading
Go back to the browser and reload the page. Your code changes were instantly applied. No commit, build or push required 😎!
Okteto enables you to debug your applications directly from your favorite IDE. Let’s take a look at how that works in one of python’s most popular IDE’s, PyCharm.
First, open the project in PyCharm, remove the comments on
if __name__ == '__main__':
Second, launch the Remote Debug Server by clicking on the Debug button on the top right. Ensure that the Debug Tool Window shows the
Waiting for process connection.. message. This message will be shown until you launch your app on the remote shell and it connects to the Debug Server.
Finally, stop and star the app again:
Starting hello-world server...
On your local machine, switch to the Debug Tool Window. Once the app connects it will show the connection to the pydev debugger. Press the
resume button to let the execution continue.
Add a breakpoint on
app.py, line 10. Go back to the browser, and reload the page.
The execution will halt at your breakpoint. You can then inspect the request, the available variables, etc.
Your code is executing in Okteto Cloud, but you can debug it from your local machine without any extra services or tools. Pretty cool no? 😉
Congratulations, you just developed your first Kubernetes application in Okteto Cloud 🚀.
Okteto lets you develop your applications directly in Kubernetes. This way you can:
- Reduce local setup and eliminate integration issues by developing the same way your application runs in production
- Test your application as fast as you type code, without typing either
kubectlin your inner loop cycle
- No more CPU cycles wasted in your machine. Hardware and network just limited by the power of the cloud
Okteto uses the
okteto.yml file to determine the name of your development environment, the docker image to use and where to upload your code. Check the Okteto manifest docs to customize your development environments with your own dev tools, images, and dependencies to adapt Okteto to your own application.