Problem statement: In multi node docker environment, make private registry as default registry

Environment detail: Oracle virtual box has two centos 7 instance installed. 
- node 1: docker and docker registry setup
    yum install docker*
    enable the docker service and start it:
     systemctl enable docker
     systemctl start docker
    running a registry in container form: 
     docker run -d -p 5000:5000 --restart=always --name registry registry:2
    push any local image to local registry [below is the example to setup image from docker.io to private registry]
     docker pull ubuntu:16.04 /*it will pull from docker.io*/
     docker tag ubuntu:16.04 localhost:5000/my-ubuntu
     docker push localhost:5000/my-ubuntu
    docker image remove ubuntu:16.04
    docker image remove localhost:5000/my-ubuntu
- node 2: only docker installed
    yum install docker*
 Note: we will pull local image from node1

Steps to make private registry default registry and accessible remotely

 Stop docker service : systemclt stop docker
- Check docker info command: docker info /* check for registry and insecure registry)
- Add entry in /etc/sysconfig/docker file on all the node(node1 and node 2 in this case)
   vi /etc/sysconfig/docker
   ADD_REGISTRY='--add-registry 192.168.0.108:5000'
- Add entry in /etc/docker/daemon.json 
 vi /etc/docker/daemon.json 
{
"insecure-registries" : [ "192.168.0.108:5000" ]
}
- start the docker service
  systemctl start docker
check the docker info command
 docker info
Registry: https://192.168.0.108:5000/v1/
Experimental: false
Insecure Registries:
 192.168.0.108:5000
 127.0.0.0/8
from node 2 pull the image
 docker pull my-ubuntu

[root@target-2 /]# docker pull my-ubuntu
Using default tag: latest
Trying to pull repository 192.168.0.108:5000/my-ubuntu ...
latest: Pulling from 192.168.0.108:5000/my-ubuntu
7b378fa0f908: Pull complete
4d77b1b29f2e: Pull complete
7c793be88bae: Pull complete
ecc05c8a19c0: Pull complete

I am writing my experience, it is well documented on k8s site as well. Below is the link to refer: https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/

Step 1: login to docker from command line: “docker login”. It will prompt for username and password. Provide that, it will create on json file “~/.docker/config.json”

Output of json : cat ~/.docer/config.json

We will use that json file and create the secret

kubectl create secret generic regcred \
    --from-file=.dockerconfigjson=<path/to/.docker/config.json> \
    --type=kubernetes.io/dockerconfigjson

once it create the secret, we can just check the output
kubectl get secret regcred -o yaml

Now this secret we can use in any pod/deployment for image pulling. Check this blog: http://www.openwriteup.com/pull-image-from-a-private-registry-k8s-using-secret/

If you created a private registry, and want to pull the image in k8s deployment. So how to use username/password for registry in k8s deployment or pod.

It would be great to use secret, Documented in k8s as well

https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/

1. Create secret for your registry

kubectl create secret docker-registry regcred –docker-server=<your-registry-server> –docker-username=<your-name> –docker-password=<your-pword> –docker-email=<your-email>

2. Kubectl get secret regcred –output=yaml

3. Use secret while creating pod

This blog we will talk about vsphere development center. This is for vsphere admin, those who want to automate day to day task, they can make use of it. Development center is integrated with vSphere, and it has record facility. Whenever we start activity, we have to start recording. Development center convert into the code.

vSphere 7 it provides to convert the task in the following: PowerCli, vRO Javascript, python and go

vSphere 6.7 it was having the option to convert the code for powercli only.

As you can see in below screenshot, we need to enable code capture and start recording. Then start capturing using development center.

I have started code capturing using powercli and created datacenter called test.

Same code i have converted in python