How can I use a local docker image in Kubernetes? - docker

Question

I have this basic Dockerfile:
FROM nginx
RUN apt-get -y update && apt install -y curl
In the master node of my Kubernetes cluster I build that image:
docker build -t cnginx:v1 .
docker images shows that the image has been correctly generated:
REPOSITORY TAG IMAGE ID CREATED SIZE
cgninx v1 d3b1b19d069e 39 minutes ago 141MB
I use this deployment referencing this custom image:
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: nginx-deployment
spec:
selector:
matchLabels:
app: nginx
replicas: 2
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: cnginx
image: cnginx:v1
imagePullPolicy: Never
ports:
- containerPort: 80
nodeSelector:
nodetype: webserver
However the image is not found:
NAME READY STATUS RESTARTS AGE
nginx-deployment-7dd98bd746-lw6tp 0/1 ErrImageNeverPull 0 4s
nginx-deployment-7dd98bd746-szr9n 0/1 ErrImageNeverPull 0 4s
Describe pod info:
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 1m default-scheduler Successfully assigned nginx-deployment-7dd98bd746-szr9n to kubenode2
Normal SuccessfulMountVolume 1m kubelet, kubenode2 MountVolume.SetUp succeeded for volume "default-token-bpbpl"
Warning ErrImageNeverPull 9s (x9 over 1m) kubelet, kubenode2 Container image "cnginx:v1" is not present with pull policy of Never
Warning Failed 9s (x9 over 1m) kubelet, kubenode2 Error: ErrImageNeverPull
I have also tried using the default imagePullPolicy, and some other things such as tagging the image with latest...
So, how can I make Kubernetes use a locally generated docker image?

Answer 1

Your PODs are scheduled on your worker nodes. Since you set imagePullPolicy to Never you need to make your image available to both nodes. In other words, you need to build it on both nodes as you did on the master.
As a sidenote, it would be probably easier in the long term if you setup a custom docker registry and push your images there.