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DAY 10

Notes ~

  • repl.it ~ > a website where one can work over any platform , and over any programming language

  • Virtual Box reads resource information from OS

  • Virtual Box creates a free Hardware from the resources available free in your system

  • time required to create an OS using docker maximum takes 1.2 sec

  • PAS - > Platform as a Service

  • every 3 years a new Redhat OS is launched

  • Backend project of redhat is Fedora that is fedora is developed for 3 years which after completion is produced with name Redhat

  • Fedora is more powerful then Redhat

  • in a terminal , by default bash is always running

  • To generate qr code in shell we have a package called qrencode

qrencode -s 32x32 -o akshayimage.png
http://www.akshaybengani.github.io

LINUX Commands ~

  • $ tac file-name.txt # reverse the order of reading from bottom to top
  • $ rev file-name.txt # reverse the words in file reading from top to bottom
  • $ qrencode -s 16x16 -o file-name.png web-site-link # Creates a QR code for the websites, -o shows output to save
  • $ systemctl enable docker # start the docker each time OS
  • $ systemctl start docker # initiate docker

Docker

  • Provides Environment for different OS and technologies
  • Docker uses kernel of base OS to develop more OS images for the use.
           [ Docker]
         [   RHEL    ]    
        [   Hardware  ]
  • it runs an OS for some dedicated purpose like running only Python that is running an micro Service
  • Docker is like a ship with containers of OS
  • the base OS doesn't know or have no information about the OS installed in containers.
  • Each container has its own IP, MAC to connect with outside world.
  • It is a technology provider
  • it works on GO language
  • search OS iso in hub.docker.com or run Command
$ docker search technology-name
  • to install image from docker use
$ docker pull image-name
  • to check installed images
$ docker images
  • to run a docker image
$ docker run -it fedora

Working

  • in backend , it talks to the kernel of based OS and creates a new container with OS of given image which contains all those micro services that you need to work with
  • after work completion , the container shutdowns itself
  • to check for shutdown container run Command
$ docker ps -a
  • Docker is an application oriented system - > as soon as the application for which container was created is closed the container also shutdowns itself
  • Single process oriented system - > no more then one process can run on this container

Install Shellinabox

  • It is a program which allows us to use shell in our browser insteed of a ssh or a putty.

Docker Basics

  • To install a OS in docker we need a docker-image.
  • You can explore docker-images online on https://www.hub.docker.com
  • To search a docker image we have a command docker search java
  • To download a image from docker liberary we use a command docker pull
docker pull hello-world
docker pull python
docker pull fedora

[root@ip-172-31-9-238 ~]# docker pull fedora
Using default tag: latest
Trying to pull repository docker.io/library/fedora ...
latest: Pulling from docker.io/library/fedora
8f6ac7ed4a91: Pull complete
Digest: sha256:9c78c69f748953ba8fdb6eb9982e1abefe281d9b931a13f251eb8aec988353de
Status: Downloaded newer image for docker.io/fedora:latest
  • To check how many images we have installed on docker we have a command docker images
[root@ip-172-31-9-238 ~]# docker images
REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
docker.io/python        latest              34a518642c76        28 hours ago        929 MB
docker.io/fedora        latest              289289d1a15b        30 hours ago        318 MB
docker.io/hello-world   latest              fce289e99eb9        5 months ago        1.84 kB
  • We can make container from any image.
  • To build a OS from docker we have a command called docker run
docker run -it fedora date
  • i stands here for interactive
  • t stands here for terminal
  • date stands here for the application program date.
  • To know how many docker containers exist in current time either in shutdown or running we have a command called docker ps -a
  • Docker is a process maintainer it can run that single process only.
  • If we want container not to stop then we can open a program bash.
[ec2-user@ip-172-31-9-238 /]$ sudo docker run -it fedora bash
[root@ef3271f6d299 /]#
  • To start an existing container we have a command docker start with the container name and you can get the container name using docker ps -a
docker start blissful_blackwell
  • To view the running containers we have a command docker ps this will give list of running containers.
  • To use the container we have already created or shutdown container we have a command called docker attach CONTAINER_NAME
docker start gracious_borg
docker attach gracious_borg
  • First we need to start the shutdowned container then we can attach the existing container.
  • To delete a conatiner we have a command docker container rm CONTAINER_ID
  • To list all the containers we have a command
docker container ls -a
  • Full form of ps is Process Status
  • To give a custom name to the container we can use the attribute --name and assign the name of the container.
docker run -it --name akshayc1 fedora bash
  • It is not important that there are all basic packages of linux installed in the image.
  • To run a docker image without exiting at the exit code use the command exec.
docker exec -it Akshayc1 bash
  • We can use internet in docker container also install ping using yum
  • ping command includes in iputils

login to Browser instead of putty

  • install shell in a box software
  • search shellinaboc centos 7
  • copy binary package link location
  • root login
  • $ rpm -ivh paste link
  • $ systemctl start shellinaboxd
  • $ systemctl enable shellinaboxd
  • $ setenforce 0
  • $ nano /etc/selinux/config
  • change enforcing to disabled
  • in inbound allow a port 4200 to anywhere which is a port of shellinabox
  • shellinabox is a socket which uses TCP protocol
  • change ec2-user password
  • in browser open url
 https://public:4200
  • for warning go to advance and proceed

docker rmi docker.io/python

*   To delete a container we use ```docker rm CONTAINER_ID```

docker rm 3346e5f5280c

*   To delete all the containers in one run

docker rm $(docker ps -qa)

*    To create n number of docker containers we can use shell scripting loop

for((i=1;i<100;i++)) do docker run fedora done

*   To get the continer IP use this command

docker inspect CONTAINER_NAME | grep -i ipadd


# Day 10

*   There is a command in linux which reverse the lines order in cat command, the command is ```tac```.

tac Day1.md

*   There is a command to reverse the string characters in a line ```rev``` is a command we can use.

rev Day1.md

*   To generate qr code in shell we have a package called ```qrencode```

qrencode -s 32x32 -o akshayimage.png http://www.akshaybengani.github.io

## Docker
*   It is a technology which provide us platform to do multiple type of things in a single platform or a system.
*   Docker is a platform provider.
*   We can use Docker to provide enviorment for website, Apps, Console applications etc.
*   Docker can be used to build hadoop platform.
*   It is a platform which can run on any platform.
*   Docker uses your base OS Kernel to build new operating systems. 
*   It means if you have windows as your base system on which docker is installed, then Windows NT kernel will be used to build new OS in Docker.
*   Windows Server 2016 supports Docker support.
*   Docker is developed in Go which is a superfast language.

## Install Shellinabox
*   It is a program which allows us to use shell in our browser insteed of a ssh or a putty.
*   Download shell in a box from from[here](https://centos.pkgs.org/7/epel-x86_64/shellinabox-2.20-5.el7.x86_64.rpm.html)
*  Download the binary file in AWS using wget or use ```rpm -ivh link```
*   

## Docker Basics
*   To install a OS in docker we need a docker-image.
*   You can explore docker-images online on https://www.hub.docker.com
*   To search a docker image we have a command ```docker search java```
*   To download a image from docker liberary we use a command ```docker pull```

docker pull hello-world docker pull python docker pull fedora

[root@ip-172-31-9-238 ~]# docker pull fedora Using default tag: latest Trying to pull repository docker.io/library/fedora ... latest: Pulling from docker.io/library/fedora 8f6ac7ed4a91: Pull complete Digest: sha256:9c78c69f748953ba8fdb6eb9982e1abefe281d9b931a13f251eb8aec988353de Status: Downloaded newer image for docker.io/fedora:latest

*   To check how many images we have installed on docker we have a command ```docker images```

[root@ip-172-31-9-238 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/python latest 34a518642c76 28 hours ago 929 MB docker.io/fedora latest 289289d1a15b 30 hours ago 318 MB docker.io/hello-world latest fce289e99eb9 5 months ago 1.84 kB

*   We can make container from any image.
*   To build a OS from docker we have a command called ```docker run```

docker run -it fedora date

*   ```i``` stands here for interactive
*   ```t``` stands here for terminal
*   ```d``` stands here for detach
*   ```date``` stands here for the application program date.
*   To know how many docker containers exist in current time either in shutdown or running we have a command called ```docker ps -a```
*   Docker is a process maintainer it can run that single process only.
*   If we want container not to stop then we can open a program ```bash```.

[ec2-user@ip-172-31-9-238 /]$ sudo docker run -it fedora bash [root@ef3271f6d299 /]#

*   To start an existing container we have a command ```docker start``` with the container name and you can get the container name using ```docker ps -a```

docker start blissful_blackwell

*   To view the running containers we have a command ```docker ps``` this will give list of running containers.
*   To use the container we have already created or shutdown container we have a command called ```docker attach CONTAINER_NAME```

docker start gracious_borg docker attach gracious_borg

*   First we need to start the shutdowned container then we can attach the existing container.
*   To delete a conatiner we have a command ```docker container rm CONTAINER_ID```
*   To list all the containers we have a command

docker container ls -a

*   Full form of ```ps``` is ```Process Status```
*   To give a custom name to the container we can use the attribute --name and assign the name of the container.

docker run -it --name akshayc1 fedora bash

*  It is not important that there are all basic packages of linux installed in the image.
*   To run a docker image without exiting at the exit code use the command ```exec```.

docker exec -it Akshayc1 bash

*   We can use internet in docker container also install ping using yum
*   ping command includes in iputils
*   To delete an image from docker liberary we have command ```docker rmi DOCKER_IMAGE_```

docker rmi docker.io/python

*   To delete a container we use ```docker rm CONTAINER_ID```

docker rm 3346e5f5280c

*   To delete all the containers in one run

docker rm $(docker ps -qa)

* To delete via a python program use this
```py
#!/usr/bin/python3
import os
print("Hello World")
filehandle = open("dockerContainers.txt","r")
for i in filehandle:
        command = "docker rm "+i
        os.system(command)
  • To create n number of docker containers we can use shell scripting loop
for((i=1;i<100;i++))
do
docker run fedora
done
  • To get the continer IP use this command
docker inspect CONTAINER_NAME | grep -i ipadd