Troubleshooting Networking

Troubleshooting Networking

Missing tools

• Images are minimal
• Shell is available
• Containers are considered immutable

Share namespaces

• Create container image with required tools
• Run and share network/pid namespace
• Install tools as required

k8s 1.16 introduces ephemeral containers to troubleshoot pods

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Demo: Namespace sharing

Join namespaces with existing container:

docker run -d --name nginx nginx
docker run -it --rm \
    --net container:nginx \
    --pid container:nginx \
    alpine