aliyun-ack-debug

Container image for debugging Alibaba Cloud ACK clusters

Usage

After building the image and pushing to a repository, quickly spin up a pod debug with the given image which does nothing but sleep infinity. Assume the image is called debug, with REG_HOSTNAME, REG_NAMESPACE and IMG_TAG set accordingly.

kubectl run debug --image="$REG_HOSTNAME/$REG_NAMESPACE/debug:$IMG_TAG"

Now, to test network-related stuff within the cluster, it suffices to spawn a shell inside the pod and utilize common networking tools such as ping, curl and dig. The following packages have been pre-installed:

• which: provides which command for quickly checking whether a command is available
• bind-utils: provides dig for DNS queries
• iputils: provides ping for ICMP ping

kubectl exec -it debug -- /bin/bash

Note that the image is based on Alibaba Cloud Linux which uses package mirrors and repositories only available within Alibaba Cloud, so it can only be built and used inside Alibaba Cloud, e.g. built within an ECS instance and deployed to an ACK cluster.

Build

Build the image as usual using Docker, Podman or otherwise. Assuming Docker is used:

docker build -t debug .