Docker

What is Docker?
Why Docker?
How Docker works?
How to install docker?
Component of Docker?
	docker soft
	docker image
	docker registry
	docker container

Lifecycle of Container?
Working / Accessing Containers
Troubleshooting Containers?

How to create image?
How to share with?
====================================
Linux?
Linux Kernel
VMS
--------------------------
What is VirtualBox?
	Vms mgmt platform
	create -> start -> stop -> restart -> pause -> unpause -> kill --> rm

What is Docker?
	Container mgmt platform
	Release
		Comm -- FREE
		Enterprise - PAID
	Wriiten in Go
	by Solomna hykes
	Version
		22.X
	

	platform/tool
	- Save cost
		VMS--APP	Container
		========	==========
		  1C1GB		 1/5 of the of vm
	- Save time
		VMS		Container
		5mins		1 sec
	- IMp Quality
		Code quality
		test quality

	mgmt
	create -> start -> stop -> restart -> pause -> unpause -> kill --> rm


	Container
	----------------------------
	How APP runs?
	What are the resources we need to run 1 APPS?

	Func - Lightweight APP running env
	Tech - Container is 
				1 PID NS 	1 USER NS	1 NET nS 	1 MNT NS
						Requestd by Docker
								Created by Kernal

	HARDWARE
			OS
		===================
		BOOTFILE + ROOTFILE
		===================
	        Kernel   + ROOTFILE

			====================
Kernel - The kernel is a computer program at the core of a computer's operating system and generally has complete control over everything in the system.

	Kernel
		Namespace		CAN		ALLOWED			NEED	
			USER		- N		MULTPLE			1
			NET		- N		1			1
			PIDTREE		- N		1			1
			MNT(RFS)	- N		1			1
		Cgroups
			Allocating CPU and RAM to PID
		Capabilities
			ubuntu
			root

===================================================
How to start with Docker?

Step 1 - install docker?
https://www.devopsschool.com/blog/how-to-install-docker-in-linux/

Step 2 - Download docker image - httpd

Step 3 - FROM Registry - https://hub.docker.com/

Step 4 - create -> start -> stop -> restart -> pause -> unpause -> kill --> rm

 11  clear
   12  docker images
   13  docker pull httpd
   14  docker images
   15  clear
   16  docker version
   17  clear
   18  docker info
   19  clear
   20  docker  images
   21  docker ps
   22  docker ps -a
   23  docker create httpd
   24  docker ps -a
   25  docker create --name raj1 httpd
   26  docker ps -a
   27  docker start 57b4b52a7cc2
   28  docker ps -a
   29  docker start 85f139f50fcb
   30  docker ps -a
   31  docker stop 85f139f50fcb
   32  docker ps -a
   33  clear
   34  docker restart 57b4b52a7cc2
   35  docker ps -a
   36  docker pause 57b4b52a7cc2
   37  docker ps -a
   38  docker stats
   39  docker ps -a
   40  docker unpause 57b4b52a7cc2
   41  docker ps -a
   42  docker kill 57b4b52a7cc2
   43  docker ps -a
   44  clear
   45  docker ps -a
   46  docker rm 57b4b52a7cc2
   47  docker ps -a
   48  history


Step 5 - how to access a container.
===============================================
		RUN
-----------------------------------
pull -> create -> start --> attached

		RUN -d 
-----------------------------------
pull -> create -> start --> DO NOT attached(PID1)

Concept
======================================================
PS is running		Vm is running		container is running
---------------------------------------------------------------------
coz of
first pid		firstpid		firstpid
==============================================================
kernal			kernal			any executable - java - python



docker run -d -p 80:80 httpd
docker run -d -p 81:80 httpd
docker run -d -p 82:80 httpd


  49  clear
   50  docker ps -a
   51  docker start 85f139f50fcb
   52  clear
   53  docker ps -a
   54  docker inspect 85f139f50fcb
   55  clear
   56  ls
   57  curl http://172.17.0.2
   58  ifconfig
   59  ip a
   60  clear
   61  docker ps
   62  docker ps -a
   63  docker run httpd
   64  docker ps
   65  docker ps -a
   66  cler
   67  clear
   68  docker run -d httpd
   69  docker ps
   70  clear
   71  ls
   72  docker ps
   73  docker inspect 8119bd677b1e
   74  cler
   75  curl http://172.17.0.8
   76  clear
   77  ls
   78  docker run -d -p 80:80 httpd
   79  docker run -d -p 81:80 httpd
   80  docker ps
   81  clear
   82  docker ps
   83  docker exec -it  897efea17c0f /bin/bash
   84  docker run -itd ubuntu
   85  docker ps
   86  clear
   87  docker exec -it 9e91e50f937a /bin/bash
   88  clear
   89  docker ps
   90  docker exec 9e91e50f937a git
   91  git
   92  docker exec 9e91e50f937a git
   93  clear
   94  docker ps
   95  docker logs 897efea17c0f
   96  clear
   97  history



    2  docker ps -a
    3  clear
    4  docker ps
    5  docker inspect c682bdbf4e0b
    6  clear
    7  curl http://172.17.0.3
    8  clear
    9  ps -eaf
   10  clear
   11  history

Docker Day 2 Session

Docker Image
===============================
collection of filesystem
layered over each others
VM Image == Machine Image
BOOTFS + ROOTFS + USERFS + APPS FS + + APPS
Kernel +  Ubuntu + root + Java + Tomcat
ex - iso, ami, vmimage
Docker Image
ROOTFS + USERFS + APPS FS + + APPS
Ubuntu + root + Java + Tomcat
10  docker images
11  docker info
12  clear
13  docker pull httpd
14  cd /var/lib/docker/
15  clear
16  ls
17  cd overlay2
18  ls
19  du -h --max-depth=1
20  cd ./ea389c2e7aa25c1d15ad09ebbea8688ed98180f45de506481520e50701ff53d7
21  clear
22  ls
23  cd diff
24  ls
25  cd ..
26  ls
27  du -h --max-depth=1
28  cd ./3a1168752426f134f3939fbe5fe1d0fcf29d2177712f3e6199b92e112f833a29
29  clear
30  ls
31  cd diff
32  ls
33  cd
34  clear
35  doker images
36  clear
37  docker images
38  docker inspect httpd
39  clear
40  ls
41  docker history httpd
42  cd -
43  cd ..
44  clear
45  ls
46  cd ..
47  ls
48  cd ..
49  ls
50  history
=============================================
How to create an image?
Project
=================================
UBUNTU + Update + GIT + Apache + index.html == 	
=========================================
UBUNTU + Update + xammpp + app == devopsschool
=========================================
UBUNTU + Update + JAVA + Tomcat + App = DevOpsX
Method 1 - using container
Method 2 - using dockerfile
----------------------------------------
FROM ubuntu
MAINTAINER Rajesh Kumar
RUN apt-get update
RUN apt-get install git -y
RUN apt-get install apache2 -y
COPY index.html /var/www/html/index.html
ENV JAVA_HOME=/tmp
CMD	- Can be replaced
ENTRYPOINT - cant be replaced
========================================
is used to SET PID 1 for the container.
docker-entrypoint.sh mysqld
=========================================================================
51  clear
52  cd
53  clear
54  docker run -itd ubuntu
55  docker ps
56  docker exec 631a832e87c6 git
57  docker exec -it 631a832e87c6 /bin/bash
58  vi index.html
59  docker cp  631a832e87c6://var/www/html
60  docker cp  631a832e87c6:/var/www/html
61  docker cp index.html 631a832e87c6:/var/www/html
62  clear
63  ls
64  docker ps
65  docker exec 631a832e87c6 git
66  clear
67  docker exec 631a832e87c6 which apache2
68  ls
69  docker ps
70  docker commit -m"ub-git-up-apa-in" 631a832e87c6 wizbrand
71  docker images
72  docker history ubuntu
73  docker history wizbrand
74  clear
75  docker history wizbrand
76  clear
77  ls
78  vi dockerfile
79  cleat
80  clear
81  docker build -t wizbrand1 .
82  docker images
83  docker history wizbrand1
84  clear
85  ls
86  docker images
87  docker ps
88  docker run -d httpd
89  docker ps
90  clear
91  docker images
92  docker run -itd wizbrand1
93  docker ps
94  df -kh
95  docker ps
96  docker stop 631a832e87c6
97  docker ps
98  df -kh
99  clear
100  docker run -itd ubuntu
101  docker ps
102  docker run -itd ubuntu ls
103  docker ps
104  docker ps -a
105  docker run -it ubuntu ls
106  clear
107  docker run -d jenkins/jenkins ls
108  docker ps -a
109  docker run -d jenkins/jenkins
110  docker ps -a
111  clear
112  docker run -d mysql
113  docker ps
114  clear
115  docker ps -a
116  docker run -it d mysql
117  docker run -itd mysql
118  docker ps
119  clear
120  docker ps -a
121  docker logs e35f0f657f09
122  clear
123  docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:tag
124  docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql
125  docker ps
126  clear
127  docker pull xampp/appdocker pull xampp/app
128  docker pull xampp/app
129  clear
130  docker images
131  docker run -itd xampp/app
132  docker ps
133  docker ps  -a
134  docker logs dc59b8196f45
135  clear
136  ocker run --name myXampp -p 41061:22 -p 41062:80 -d -v ~/my_web_pages:/www tomsik68/xampp
137  docker run --name myXampp -p 41061:22 -p 41062:80 -d -v ~/my_web_pages:/www tomsik68/xampp
138  docker ps
139  clear
140  ls
141  docker images
142  docker save -o wizbrand.tar wizbrand1
143  ls
144  clear
145  docker images
146  docker ps -a
147  docker container stop $(docker container ls -aq)
148  docker rm -vf $(docker ps -a -q)
149  docker rmi -f $(docker images -a -q)
150  clear
151  l;s
152  ls
153  docker images
154  docker run -itd ubuntu
155  clear
156  docker ps
157  docker commit -m"demo" -a"rajesh" 9d9493b4f68e rajesh
158  docker images
159  docker save -o rajesh.tar rajesh
160  ls
161  docker load -i rajesh.tar
162  docker images
163  docker tag rajesh devopsschools/nov2023
164  docker images
165  docker login
166  docker push devopsschools/nov2023
167  clear
168  history
Code language: PHP (php)