2. DOCKER & KUBERNETES : INSTALLATION

2. DOCKER & KUBERNETES : INSTALLATION

https://drive.google.com/file/d/1eq5ZGs9JH9F7R1z3wtUcKIWJi8HFr7MM/view?usp=sharing

Docker & Kubernaties

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LINUX FUNDAMENTALS

https://hub.docker.com/

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search for docker images

oraclelinux

Its free

In Tag : check size and version

oracle database

Its enterprice product

Its not free : it will ask for payment

oracle weblogic Server

Its not free : it will ask for payment

httpd

its free : no check out process

docker

click on explore

click - DOCKER CE

click - DOCKER EE

AWS

Azure

EE and CE difference is same as open jdk and oracle jdk

Eg:

Application performance

memory leakage support

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for oracle employees/customers

container-registry.oracle.com

Sign in

Docker is Architecture

Kubernaties is a framework

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Step6:

https://github.com  

                username : pavankumarmadhu123

                password : Pavan_123g

Step7:

https://hub.docker.com/

                username : pavankumarmadhu123

                password : Pavan_123d

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As per the diagram we will install one by one now:

VM with Linux - TCL (Tiny Core Linux)

Docker Installed (Docker CLI)

Network of Host - NAT (Communicating externally)

VM - IP (DHCP) - HOA

SSH Keys (RSA) (Internal)

from VM should 

Step8: Already we have laptop with Windows10

Step9: Oracle VM VirtualBox

Step10: 

docs.docker.com

 -> Search for "Docker Toolbox"

OR https://github.com/docker/toolbox/releases

 -> download - DockerToolbox-19.03.1.exe

 -> Install

################ EVERY DAY ACTIVITY ##############################

double click on "Docker Quickstart Terminal"

wait for sometime to generate IP address...

putty

192.168.99.100

username: docker

password: tcuser

open another terminal

Create duplicate session

username: docker

password: tcuser

sudo -i

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docker prompt

------

docker info

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Docker Architecture

SWARM

Docker Host

Docker machine

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//Search Docker Image

Go to -> hub.docker.com -> search for -> oraclelinux

OR

//Through docker command

docker search oraclelinux  (to search)

//Create Docker Image (below we are creating total 3 images - oraclelinux, httpd, ubuntu)

docker pull oraclelinux

docker pull httpd  (it will pull latest)

//pull particular version

docker pull ubuntu:20.04

//Verify ALL Docker Images

docker images

//Inspect Docker Image

docker inspect oraclelinux 

OR

docker inspect 0f4  (Using Image Id)

docker history oraclelinux  (how this image is built)

docker inspect httpd  (Inspect this image)

docker images

docker system df

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//Create container of httpd and verify what happens to container

//container name can be upper or lower

//image name should be lower case

docker create --name TestApache httpd

//container is a docker process so we should be able to see

docker ps -a

//start the container

docker start TestApache

docker ps -a

docker top TestApache

ps ax | grep containerd

docker inspect TestApache  (it has lot of secured data we should not share to every one)

docker ps -a

ls /dev | grep tty

//go inside container and see what we can see this is just to verify..

docker exec -i -t TestApache bash  (i - interactive, -t - default terminal)

ps   //will not work bez we are in child process

curl //will not work bez we are in child process

docker stop TestApache

docker ps -a  //u see it as Exited

docker top TestApache //since container is not running so there is no containerd available

docker start TestApache

docker top TestApache  //now you will see containerd, bez above we have started the container, but will give different Id

docker images

//now we will create container for Docker Image - "oraclelinux"

docker create --name TestOL oraclelinux  //it will run for milisec and exit immediately, bez we have not used -i, -t to run in foreground

docker start TestOL

docker ps -a | grep TestOL  //we see as status as Exited, because its not running in foreground

docker rm TestOL  //physical remove, means remove file itself

docker kill <<ContinerName>>     //immediate kill

docker create -i -t --name TestOL oraclelinux  //you will see created Id, to run in foreground (when we use shell then we can use this command)

docker ps -a | grep TestOL

docker top TestOL  //to see containerd Id

docker ps -a

//go inside a container and check the IP address created for that container.

//exec will always create child process

docker exec TestOL cat /etc/hosts     //its not bash command so no need of -i -t, means only if its a bash then use -i -t to go inside container

docker exec TestOL -i -t TestOL bash //it will create one more child process and entered in to child

exit  //exiting from child process

//go to parent process

docker attach TestOL

ps ax

exit  //exiting from parent process

docker ps -a

docker create -i -t --restart=always --name TestOL2 oraclelinux  //create with restart policy, so that when ever exit from parent it should restart automatically

docker start TestOL2

docker attach TestOL2

exit  //exit from parent

docker ps -a | gerp TestOL2  //it will be still running...

exit

docker-machine stop default