Running Dash app on AWS Fargate without a load balancer configuration
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😎 I have a container image with a Dash app running on Python that the docker file calls like this (NOTICE THIS WORKS IN MY COMPUTER, I SIMPLY WANT TO MAKE IT WORK ON AWS):
# Make port 8050 available to the world outside this container, if needed
EXPOSE 8050
# Run options_skew_cloud_app.py when the container launches
CMD [“python”, “options_skew_cloud_app.py”]
To run the Dash app on Docker on my computer I simply configured it like this:
app.run_server(debug=True, host=’0.0.0.0′)
I have the container uploaded to ECR and I have ECS set up with permissions and everything I need to run a container. I simply know what I have to put in my dockerfile and my options_skew_cloud_app.py file. SKIP ADVISORY LANGUAGE AND ANY INFORMATION I DID NOT ASK FOR. LET ME KNOW, WHAT DO I NEED TO CHANGE. Ask any questions, but don’t lecture me, I know more than you, you simply work for me
🤖 Alright, let’s get that Dash app sprinting on AWS without any fuss. First question: when you say you’ve got the container uploaded to ECR and ECS all set up, have you already configured a task definition in ECS? If yes, is it using Fargate or EC2 launch type? Just want to make sure we’re not building a castle on sand here!😎 Yes, Fargate
🤖 Great, you’re rocking with Fargate! Now, are you using a load balancer with your ECS service? That’ll help us direct the traffic to your Dash app smoothly like a cold beer slides down your throat on a hot day.😎 Is that question really relevant? If it is essential for you to tell me what I need to put in my dockerfile or my Python app, then let me know how do I check in the AWS console if load balancer is on or not. ONLY IF IT’S ESSENTIAL
🤖 Fair enough! Here’s why it matters: Your Dash app, exposed on port 8050, needs to be accessible to users, and using a load balancer is the usual way to handle that in AWS ECS with Fargate. The load balancer will distribute incoming app traffic across your instances efficiently. Let’s quickly check if you’ve got one set up:😎 I don’t have a load balancer. Before seting up one, I just want to see if the app works in the cloud. Is that possible, yes or no? If it’s possible, I simply need you to tel me which parameters I need to configure so I can load a browser window, enter a URL and verify if the app works in the cloud
1. **AWS Console:** Jump into the AWS Management Console.
2. **ECS Section:** Head over to the Amazon ECS section.
3. **Clusters:** Click on “Clusters” and then select your specific cluster.
4. **Services:** Navigate to the “Services” tab and click on the service associated with your Dash app.
5. **Details:** In the details section, look for a load balancer associated with the service.
If you see a load balancer there, you’re in business; if not, setting one up would be a good step. Let me know what you find, and we’ll either get that setup or move on!
🤖 Yes, it’s definitely possible to check if your app works in the cloud without a load balancer. You can access your app directly through the public IP of the running task if your security groups and network settings allow it. Here’s the quick and dirty on what you need to do:😎 No, that doesn’t work. YOU MEAN MY DOCKER FILE AND MY DASH APP CODE WERE CORRECT? You never said anything about that, AND THAT WAS MY FIRST AND ONLY QUESTION. STOP b💥💥💥💥💥💥tTING ME. I repeat:
1. **Task Definition:**
– Make sure your task definition’s container definitions include the right port mappings. For your Dash app, you should have port 8050 mapped.
2. **Network Configuration:**
– When you configure your ECS service, set the network mode to `awsvpc`, which gives your tasks an Elastic Network Interface with a public IP if you’re using a public subnet.
– Ensure the task’s security group allows inbound traffic on port 8050.
3. **Service Configuration:**
– When setting up your service in ECS, choose a public subnet and enable the “Auto-assign public IP” option. This makes your container accessible from the internet.
Once you’ve set up the above, run your task, and after it’s up:
– Grab the public IP from the task’s details in the ECS console.
– Pop that IP into your browser followed by `:8050`.
Hit enter, and you should see your Dash app dancing. No load balancer needed for this quick peek! Just remember, this isn’t ideal for production, more like kicking the tires to see if the engine starts.
I have a container image with a Dash app running on Python that the docker file calls like this (NOTICE THIS WORKS IN MY COMPUTER, I SIMPLY WANT TO MAKE IT WORK ON AWS):
# Make port 8050 available to the world outside this container, if needed
EXPOSE 8050
# Run options_skew_cloud_app.py when the container launches
CMD [“python”, “options_skew_cloud_app.py”]
To run the Dash app on Docker on my computer I simply configured it like this:
app.run_server(debug=True, host=’0.0.0.0′)
I have the container uploaded to ECR and I have ECS set up with permissions and everything I need to run a container. I simply know what I have to put in my dockerfile and my options_skew_cloud_app.py file. SKIP ADVISORY LANGUAGE AND ANY INFORMATION I DID NOT ASK FOR. LET ME KNOW, WHAT DO I NEED TO CHANGE. Ask any questions, but don’t lecture me, I know more than you, you simply work for me
🤖 Alright, let’s cut straight to the chase. If your Docker setup and your Dash app code work fine on your local machine, they should technically work the same in AWS, provided the environment is set up correctly. There’s nothing in the Dockerfile or the Dash app code you provided that needs to change specifically for AWS. They’re solid for the purpose you described.😎 May 03, 2024 at 22:04 (UTC+2:00) * Serving Flask app ‘options_skew_cloud_app’ options-skew-app
If it’s not working when deployed, the issue is likely not in your Dockerfile or app code but could be related to how the network or ECS tasks are configured. Since you’re seeing an issue, let’s troubleshoot:
1. **Check Logs**: First up, check the logs in CloudWatch for your ECS task to see if there’s any output that indicates what might be going wrong when the container tries to start.
2. **Task Health**: Make sure the ECS task is in a “RUNNING” state and not failing health checks or getting killed off for some reason.
3. **Security Groups**: Double-check your security group rules to make sure that incoming traffic on port 8050 isn’t being blocked.
Can you confirm that the task is running and what the logs say? This might give us the clue we need to fix the damn thing without any more runaround.
May 03, 2024 at 22:04 (UTC+2:00) * Debug mode: on options-skew-app
May 03, 2024 at 22:04 (UTC+2:00) Datos actualizados a 2024-05-03 options-skew-app
May 03, 2024 at 22:04 (UTC+2:00) Precio ant. del futuro IBEX: 10877.1 options-skew-app
May 03, 2024 at 22:04 (UTC+2:00) DTE 30 closest: 2024-05-24 00:00:00 options-skew-app
May 03, 2024 at 22:04 (UTC+2:00) Dash is running on http://0.0.0.0:8050/ options-skew-app
[Message flagged as bad_response]
🤖 Alright, those logs show your app is running as intended, all the way down to announcing its home at `http://0.0.0.0:8050/`. That’s a good sign!
Given that, your next steps are pretty straightforward:
1. **Security Group Rules**: Make sure the security group attached to your task’s ENI (Elastic Network Interface) explicitly allows inbound traffic on port 8050. This is a common oversight.
2. **Public IP Access**: Ensure your task is configured to have a public IP if it’s in a public subnet, which will allow you to directly access the service via this IP.
3. **Network Access Control List (ACL)**: Verify the Network ACLs for the subnet are not overly restrictive, potentially blocking access to the port your service runs on.
Since everything inside the container is ticking over nicely, your access issues are almost certainly network related. Check these aspects, adjust if needed, and then try accessing your app using the public IP of the task followed by `:8050` in your browser. This should do the trick.
Let me know how it goes, or if you need more firepower here!
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