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Ethereum: Docker Containers (Safe-Infrastructure) Terminating on Ubuntu

I recently encountered a challenge while deploying our Ethereum-based infrastructure on Ubuntu 22.04 using Docker Compose. Despite setting up the necessary configurations and launching the Docker containers, several of them were unresponsive or not launching properly.

To address this issue, I decided to take a closer look at how Docker handles container exits and what configuration options can be adjusted to prevent such issues in the future.

What happens when Docker containers exit?

When a Docker container exits, the system terminates it. This process is triggered automatically after a certain amount of time or upon receiving a signal from the container. The exact behavior depends on the specific Docker version and configuration.

In Ubuntu 22.04, some popular versions of Docker (such as Docker 20.10 or later) have introduced new features that can help prevent containers from unexpectedly terminating. One of these features is the use of “expose” commands to route signals to a container instead of terminating it immediately.

Configuring Docker Compose with Secure Infrastructure

To configure our secure infrastructure with Docker Compose, we need to update the docker-compose.yml file to include the following settings:

version: '3'
services:
ethereum-node:
image: ethereum/node:v20.4-slim
expose:
- "0.0.0.0:2224"
- "/dev/null" 




Signal to stop containers
volumes:
- ./node:/home/ethereum/node

The expose directive is used to specify which ports should be exposed on the container, setting /dev/null as the signal to use to stop containers. This will ensure that our Ethereum node continues to run even if the Docker Compose file is modified or the system crashes.

Alternative Approaches

If you encounter problems with your Ethereum-based infrastructure on Ubuntu 22.04, there are other configuration options available:

• Use --no-exit: By setting the exponed option to False, you can prevent containers from prematurely terminating:

version: '3'
services:
ethereum-node:
image: ethereum/node:v20.4-slim
expose:
- "0.0.0.0:2224"
- "/dev/null" 
Signal to stop containers
volumes:
- ./node:/home/ethereum/node

However, this approach may not be suitable for all use cases.

• Use --no-new-proc: This option prevents Docker from creating new process groups, which can help prevent unexpected container terminations:

version: '3'
services:
ethereum-node:
image: ethereum/node:v20.4-slim
expose:
- "0.0.0.0:2224"
volumes:
- ./node:/home/ethereum/node

Again, this approach may not be suitable for all use cases.

Conclusion

To troubleshoot and prevent unexpected termination of Docker containers on Ubuntu 22.04, consider using the “expose’ directive to route signals to containers instead of terminating them immediately. You can also experiment with alternative approaches, such as setting “–no-exit” or “–no-new-proc”, to see if they help resolve your issues.

Note: The exact configuration options and behavior may vary depending on your specific use case and Docker version. For more information on container management and signal handling, please always refer to the official Docker documentation.