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Create a custom nginx image

How to build a custom nginx for a static web site

Install docker on Ubuntu 19.04

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu disco stable test"
sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io
sudo adduser $(whoami) docker

Create a folder for this project

Create "Dockerfile" file

FROM ubuntu:xenial
RUN apt update && apt install -y nginx
EXPOSE 80
COPY . /var/www/html
CMD ["nginx", "-g", "daemon off;"]

Create your index.html file, this must be in the same directory than the Dockerfile

<html>
<head>
  <title>Raspberry Kubernetes</title>
</head>
<body>
  <h1>My static web site running on Raspberry Kubernetes</h1>
</body>
</html>

Build the image

docker build -t <replace by your image name> .
ie: docker build -t some-content-nginx .
Note the point at the end is important dont delete

List image

docker images
You should be able to see you image listed.
REPOSITORY           TAG                 IMAGE ID            CREATED             SIZE
my-nginx             v1.0                4e3c3cfc6dbf        12 minutes ago      205MB
some-content-nginx   latest              4e3c3cfc6dbf        12 minutes ago      205MB
ubuntu               xenial              56bab49eef2e        7 days ago          123MB

Run the image

docker run --name some-nginx -d -p 8080:80 some-content-nginx
Note the name of the image is at the end.

See running containers

docker ps -a
Use name for docker stop [container name

See it...

go to http://localhost:8080/
and you should be able to see the index.html content displayed

Push image to hub repository

Create a repository

Login into your docker account, if you dont have create one
Create a private repository

Login to docker hub

docker login -u "username" -p "password" docker.io

Tag the image prior push

The tagname should be identical to your respository ie:

sudo docker tag some-content-nginx:latest crhostservices/custom_nginx:latest
See the crhostservices/custom_ngnix

docker tag local-image:tagname new-repo:tagname

if you run:

docker images
You should see your tag image

Pushing the image to Docket io

same case here , push the image with the whole repository name
docker push new-repo:tagname

If you dont use the full repository name, you will get an error "requested access to resource is denied"

Other useful docker commands

To remove images use

docker rmi -f [image_id]
Note: if you are trying to remove a image and is in use by a container you will get an error like this
image is being used by running container xxx
so you will need to stop container first, see below

Stop a container

docker ps -a
It will show all containers
without -a will show only running containers
get the container_id to stop

docker stop [container_id]

Pull you image to docker

docker pull crhostservices/custom_nginx:latest
Need to specify full repository
Please note you need to make it public or login if it's private
Go to run image example , to make it available on localhost.

Deploy in Kube node

you may need to loing in docker.
kubectl run <YOUR_DEPLOYMENT_NAME> --image=docker.io/$docker_username/<YOUR_PUBLIC_REPO_IMAGE_NAME>:<TAG>

Good repository for arm images - ARM is the processor of Pi, so images must comply with this standard

https://github.com/alexellis/docker-arm/tree/master/images/armhf

https://hub.docker.com/_/nginx