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There have many container running on the host. And I want to capture packets for the one container of these. Is there any way to do this?
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Can we have a single container with multiple image like nginx + Redis + alpine ? You can have multiple processes inside a container but it wouldn't really be a best practice. Having NGINX and Redis in separate containers but inside the same pod would be better.
It's ok to have multiple processes, but to get the most benefit out of Docker, avoid one container being responsible for multiple aspects of your overall application. You can connect multiple containers using user-defined networks and shared volumes.
In later versions of Docker, it provides the use of multi-stage dockerfiles. Using multi-stage dockerfiles, you can use several base images as well as previous intermediate image layers to build a new image layer.
You can bind to the network namespace of one container to another:
docker run -it --rm --net container:<container_name> \ nicolaka/netshoot tcpdump ... To see more about the netshoot image used above, see: https://github.com/nicolaka/netshoot
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