Create docker image from docker file, run it and push to ibm registry

Introductory work and hello-world running

• First check the docker cli is installed
  • that can be done by following command docker --version
• Check ibmcloud cli is installed or not. imbcloud version will tell you whether ibmcloud is installed or not
• Change to project folder
  • cd /home/project
  • [ ! -d 'CC201' ] && git clone https://github.com/ibm-developer-skills-network/CC201.git
  • cd CC201/labs/1_ContainersAndDocker/
  • see available images docker images
  • pull first dokcer image from docker hub docker run hello-world
  • Now we can see all the running images by docker ps -a
  • Now we can remove the container by its container id docker container rm <container id>
  • lets check whether it still running or not docker ps

Build an image using docker file

• We already cloned the docker filea and app

• docker file is the following.

    
  FROM node:9.4.0-alpine
  COPY app.js .
  COPY package.json .
  RUN npm install &&\
    apk update &&\
    apk upgrade
  EXPOSE  8080
  CMD node app.js
  

• we can build the image by running dockcer build . -t myimage:v1
• let see all the images docker images

Runing the image

• Now that we have built the image, we can run it docker run -dp 8080:8080 my_image:v1
• Now check whether app is running . curl lacalhost:8080, this will tell some output which confirms that the app is running

Stop the image

• Now we can stop it by running docker stop <container id>
• We can actually actually stop all the containers docker stop $(docker ps -q)
• docker ps will tell whether everything is stopped or something is running

Push image to container registry

• First need to logiin ibmcloud
• then following command will tell information regarding the account ibmcloud target
• Need to create an IBM cloud container Registry(ICR) namespace. Since Container Registry is multitenant, namespace will devide the registry among different users
• ibmcloud cr namespaces
• target the desired region, here in coursera the region is set us-south, ibmcloud cr region-set us-south
• Now need to login to account ibmcloud cr login
• export namespace as environment variable so that, it can be used later. export MY_NAMESPACE=sn-labs-$USERNAME
• Tag the image so that it can be pushed docker tag myimage:v1 us.icr.io/$MY_NAMESPACE/hello-world:1
• Now push the image docker push us.icr.io/$MY_NAMESPACE/hello-world:1
• Verify the images are available or not ibmcloud cr images
• If we want to see only the image availabe we can see it imbcloud cr images --restrict $MY_NAMESPACE

Delete the project

• From Open shift console goto project -> click action->delete project