My Kubernetes Debug Container

When I’m Debuggin some problems inside Kubernetes or Openshift environment, I usually need some more tools to work throught the issue. For this purpose I have created separate debugging container that I can deploy and access the tools in that way,

The Dockerfile is quite simple:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11


FROM ubuntu:22.04
ENV TZ=Europe/Helsinki
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
RUN apt update && \
    apt install  -y openssh-client inetutils-ping curl wget sudo bind9-dnsutils inetutils-telnet mysql-client nano vim postgresql-client mongo-tools && \
    apt autoremove --yes && rm -rf /var/lib/{apt,dpkg,cache,log} 

RUN groupadd -g 1001 tiki && useradd -m -g 1001 tiki && echo "%tiki ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers 
USER tiki
WORKDIR /home/tiki
CMD ["tail", "-f", "/dev/null"]

I have published the Docker Image freely to Quay. It can be pulled from url: quay.io/joonast/ubuntu-debug

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16


$ podman pull quay.io/joonast/ubuntu-debug
Trying to pull quay.io/joonast/ubuntu-debug:latest...
Getting image source signatures
Copying blob fcec9b1d30c9 done  
Copying blob 08c01a0ec47e done  
Copying blob 0ddbb7d5bd84 done  
Copying blob 75ecb79da144 done  
Copying config 6baf222f26 done  
Writing manifest to image destination
Storing signatures
6baf222f26688850ea908f94fa8f4fa120fc16516fe7cc2b9a6fbc79c5f79eef


$ podman images quay.io/joonast/ubuntu-debug
REPOSITORY                    TAG         IMAGE ID      CREATED        SIZE
quay.io/joonast/ubuntu-debug  latest      6baf222f2668  21 months ago  312 MB

When I deploy pod from the built Docker image i use this pod.yml configs:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10


kind: Pod
apiVersion: v1
metadata:
  name: ubuntu-debug
  labels:
    app: ubuntu-debug
spec:
  containers:
    - name: ubuntu-debug
      image: quay.io/joonast/ubuntu-debug

1

$ kubectl apply -f pod.yml