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@ppanyukov
Created June 18, 2022 14:04
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Using Docker in Kubernetes
---
# This creates a deployment where each pod has two containers:
# - Docker Server: the actual docker engine.
# - Docker Client: simple Ubuntu instance with docker cli so we can
# test the docker things. In practice this would be some CI agent
# like Azure Devops agent or Jenkins or anything at all.
#
# After this deployment is created, wait for a bit for docker CLI to be installed
# in the client container. Then shell into it and use docker commands like docker build etc
# to test that things actually work.
apiVersion: apps/v1
kind: Deployment
metadata:
name: docker-demo
labels:
app: docker-demo
spec:
replicas: 1
selector:
matchLabels:
app: docker-demo
template:
metadata:
labels:
app: docker-demo
spec:
tolerations:
# So we can run on spot instances in Azure AKS, add your own as required.
- effect: NoSchedule
key: kubernetes.azure.com/scalesetpriority
operator: Equal
value: spot
containers:
# Docker server
- name: server
image: docker:20.10.17-dind
env:
# Required to talk plain HTTP, until we figure out how to talk over HTTPS or SSH.
- name: DOCKER_TLS_CERTDIR
value: ""
securityContext:
privileged: true
# Docker client. Installs docker cli. All docker commands talk to docker server.
#
# Once this is running we can shell into this container and try out docker commands.
- name: client
image: ubuntu:20.04
env:
- name: DOCKER_HOST
value: "tcp://localhost:2375"
command: ["/bin/bash"]
args:
- "-c"
- |
set -e
echo "Installing docker client"
(
set -x
# Install docker client form MSFT repository
apt-get update
apt-get install --no-install-recommends -y ca-certificates
apt-get install --no-install-recommends -y curl
# Install repository configuration
# Install Microsoft GPG public key
curl -sSL https://packages.microsoft.com/config/ubuntu/20.04/prod.list | tee /etc/apt/sources.list.d/microsoft-prod.list
curl -sSL https://packages.microsoft.com/keys/microsoft.asc | tee /etc/apt/trusted.gpg.d/microsoft.asc
# Finally docker client
apt-get update
apt-get install -y moby-cli
)
# Finally a sleep loop
while true
do
echo -n 'sleeping: '; date; sleep 10;
done
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