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Ethereum: Docker Containers (Secure Infrastructure) Exited on Ubuntu OS

I recently faced a challenge while deploying our Ethereum-based infrastructure on Ubuntu 22.04 using Docker Compose. Although I had set up the necessary configurations and launched the Docker containers, many of them were not responding or exiting correctly.

To address this issue, I decided to take a closer look at how Docker handles container exits and what configuration options can be changed 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 period of time or when a signal is received 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 exiting unexpectedly. One such feature is the use of “expose” commands to forward signals to a container instead of terminating it immediately.

Configuring Docker Compose with Secure Infrastructure

To configure our secure infrastructure using 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 in the container, while 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.

version: '3'
services:
ethereum node:
image: ethereum/node:v20.4-slim
exhibit:
- "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 exits:

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

This approach may not be suitable for all use cases either.

Conclusion

To troubleshoot and prevent Docker containers from unexpectedly exiting on Ubuntu 22.04, consider using the `expose’ directive to route signals to containers instead of terminating them immediately. You can also try 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. Always refer to the official Docker documentation for more information on container management and signal management.