Pulling local repository docker image from kubernetes - kubernetes

Question

Trying to install a sample container App using Pod in my local environment
I'm using kubernates cluster coming with docker desktop.
I'm creating the Pod using bellow command with the YML file
kubectl create -f test_image_pull.yml
apiVersion: v1
kind: Pod
metadata:
# value must be lower case
name: sample-python-web-app
spec:
containers:
- name: sample-hello-world
image: local/sample:latest
imagePullPolicy: Always
command: ["echo", "SUCCESS"]
docker file used to build the image and this container running without any issue if u run with docker run
# Use official runtime python
FROM python:2.7-slim
# set work directory to app
WORKDIR /app
# Copy current directory
COPY . /app
# install needed packages
RUN pip install --trusted-host pypi.python.org -r requirement.txt
# Make port 80 available to outside container
EXPOSE 80
# Define environment variable
ENV NAME World
# Run app.py when the container launches
CMD ["python" , "app.py"]
from flask import Flask
from redis import Redis, RedisError
import os
import socket
#connect to redis
redis = Redis(host="redis", db=0, socket_connect_timeout=2, socket_timeout=2)
app = Flask(__name__)
#app.route("/")
def hello():
try:
visits = redis.incr("counter")
except RedisError:
visits = "<i>cannot connect to Redis, counter disabled</i>"
html = "<h3>Hello {name}!</h3>" \
"<b>Hostname:</b> {hostname}<br/>" \
"<b>Visits:</b> {visits}"
return html.format (
name=os.getenv("NAME", "world"),
hostname=socket.gethostname(),
visits=visits
)
if __name__ == "__main__":
app.run(host="0.0.0.0", port=80)
Flask
Redis
Once I describe the pod it shows me below error
kubectl describe pod sample-python-web-app
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 3m25s default-scheduler Successfully assigned default/sample-python-web-app to docker-desktop
Normal Pulling 97s (x4 over 3m22s) kubelet, docker-desktop Pulling image "local/sample:latest"
Warning Failed 94s (x4 over 3m17s) kubelet, docker-desktop Failed to pull image "local/sample:latest": rpc error: code = Unknown desc = Error response from daemon: pull access denied for local/sample, repository does not exist or may require 'docker login': denied: requested access to the resource is denied
Warning Failed 94s (x4 over 3m17s) kubelet, docker-desktop Error: ErrImagePull
Normal BackOff 78s (x6 over 3m16s) kubelet, docker-desktop Back-off pulling image "local/sample:latest"
Warning Failed 66s (x7 over 3m16s) kubelet, docker-desktop Error: ImagePullBackOff

Answer 1

Kubernetes pulls container images from a Docker Registry. Per the doc:
You create your Docker image and push it to a registry before
referring to it in a Kubernetes pod.
Moreover:
The image property of a container supports the same syntax as the
docker command does, including private registries and tags.
So, the way the image is referenced in the pod's spec - "image: local/sample:latest" - Kubernetes looks on Docker Hub for the image in repository named "local".
You can push the image to Docker Hub or some other external Docker Registry, public or private; you can host Docker Registry on the Kubernetes cluster; or, you can run a Docker Registry locally, in a container.
To run a Docker registry locally:
docker run -d -p 5000:5000 --restart=always --name registry registry:2
Next, find what is the IP address of the host - below I'll use 10.0.2.1 as an example.
Then, assuming the image name is "local/sample:latest", tag the image:
docker tag local/sample:latest 10.0.2.1:5000/local/sample:latest
...and push the image to the local registry:
docker push 10.0.2.1:5000/local/sample:latest
Next, change in pod's configuration YAML how the image is referenced - from
image: local/sample:latest
to
image: 10.0.2.1:5000/local/sample:latest
Restart the pod.
EDIT: Most likely the local Docker daemon will have to be configured to treat the local Docker registry as insecure. One way to configure that is described here - just replace "myregistrydomain.com" with the host's IP (e.g. 10.0.2.1). Docker Desktop also allows to edit daemon's configuration file through the GUI.

Answer 2

If you want to setup local repository for Kubernetes cluster, you might follow this guide .
I would recommend using Trow.io which is a image Management for Kubernetes to quickly create a registry that runs wihtin Kubernetes and provides a secure and fast way to get containers running on the cluster.
We're building an image management solution for Kubernetes (and possibly other orchestrators). At its heart is the Trow Registry, which runs inside the cluster, is simple to set-up and fully integrated with Kubernetes, including support for auditing and RBAC.
Why "Trow"
"Trow" is a word with multiple, divergent meanings. In Shetland folklore a trow is a small, mischievous creature, similar to the Scandanavian troll. In England, it is a old style of cargo boat that transported goods on rivers. Finally, it is an archaic word meaning "to think, believe, or trust". The reader is free to choose which interpretation they like most, but it should be pronounced to rhyme with "brow".
Whole installation process is described here.