day1.txt

What is Docker?
=================================
https://www.devopsschool.com/blog/

		AKA Docker Engine
- Container mgmt tool
- Release
			Community 
			Enterprise
- Written in Go
- by Soloman Hykes
- 


tool
	save time
				PS(1 day) + vms(5 mins) + container(1 sec)
	improve the quality
				Quality coding and Quality testing	
	save cost
				while running apps with container

mgmt
		create -> start -> stop -> removing

Container --????
is a app run time env where we have seprate one net + mnt + pid + user powered by Kernal(ns+_cgr+cap)
is a lightweight app run time env.



=================================
How a APP run in Laptop| VMs?
What are the RESOURCES needed to run a app?
What are the components you need to run a app in OS?
=================================================

HARDWARE
		OS
		--------
		Kernel + System util			ALLOWED by OS				CAN
		----------------------------------------------------------------
		Namespace
		MNT NS		ROOT FILESYSTEM		1					N
		USR NS		USER					N					N
		PID NS		PID					1					N
		NET NS		NETWORK				1					N

		CGROUPS		CPU+RAM 	 
		CAPABILITIES	USER PERM
				
		==========================================


HUMAN ---> Docker Client -> Docker Server --> ContainerD ---> Kernel

-------------------------
other interactives
=======================================
ContainerD is off container interface for kuber
================================================================
Dcoker architecture
======================================

HUMAN ---> Docker Client ---API---> Docker Server --> ContainerD ---> Kernel
		 ===========================================
				Docker Engine



How to install docker?
==========================

Lets Proof that what is container?



Docker Component
===========================================
1. Docker engine

2. Docker Image

Vm Image ->
Bootfs + Rootfs + UserFs + Appfs

Container Image = 	Rootfs + UserFs + Appfs
			    ubuntu	root	  + java + tomcat + app
				centos	apache

From One Image - You can get as many container.
	
===================

3. Registry
		repos
			version of filesystem === docker image

		hub.docker.com
		google reg
		artifactory
		nexus

4. container
=========================================================


==================================================
Container lifecycle
---------------------------------------------------------
Create -> Start -> Stop -> start -> restart -> pause -> unpause -> kill -> remove



 30  docker ps
   31  ls /
   32  docker exec 93a842fd7119 ls /
   33  clear
   34  ls
   35  ps
   36  w
   37  ps -eaf | grep container
   38  clear
   39  ls
   40  w
   41  docker ps
   42  docker exec -it 93a842fd7119 /bin/bash
   43  docker insect 93a842fd7119
   44  docker inspect 93a842fd7119
   45  ip a
   46  clear
   47  ps -eaf
   48  clear
   49  ls
   50  docker ps
   51  docker exec 93a842fd7119 ps -eaf
   52  docker info
   53  docker version
   54  clear
   55  which docker
   56  which dockerd
   57  which containerd
   58  ps -eaf | grep dock
   59  ps -eaf | grep contain
   60  clear
   61  ls
   62  docker images
   63  docker pull httpd
   64  clear
   65  docker images
   66  docker ps
   67  docker ps -a
   68  docker stop 93a842fd7119
   69  docker rm 93a842fd7119
   70  clear
   71  docker ps -a
   72  docker create httpd
   73  docker ps -a
   74  docker create --name raj1 httpd
   75  docker ps -a
   76  clear
   77  docker create --name raj2 httpd
   78  docker ps -a
   79  docker start 7c8afaedc1f9
   80  docker ps -a
   81  clear
   82  docker start rajq1
   83  docker start raj1
   84  docker ps -a
   85  docker stop raj1
   86  docker ps -a
   87  docker start raj1
   88  docker ps -a
   89  docker restart 7c8afaedc1f9
   90  docker ps -a
   91  clear
   92  docker ps -a
   93  docker pause 175d3e949c6f
   94  docker ps -a
   95  docker unpause 175d3e949c6f
   96  cler
   97  clear
   98  docker ps -a
   99  docker kill 7c8afaedc1f9
  100  docker ps -a
  101  docker rm 4b0e9a3bb569
  102  docker ps -a
  103  docker rm 175d3e949c6f
  104  history



Assignment 
-------------------
Diff between docker stop and docker kill?
Diff between docker pause and docker unpause?

=============================================================
docker stats


https://www.devopsschool.com/blog/the-docker-command-line-complete-referenece/

PS					VS					Container
===============================================
Coz of PID1		Coz of PID1		Coz of PID1
systemd			systemd			Anything

run
=============================
pull + create + start + attach

run -d
=============================
pull + create + start + attach

attach = terminal attached to the PID 1 excutable of the container.

How to use container?
==============================
Go inside
- exec would execute an executable inside a container.
- SHELL
		docker exec -it 175d3e949c6f /bin/bash

Access a container from outside?
$ docker run -d httpd
$ docker run -d -p 80:80 httpd
$ docker run -d -p 81:80 httpd

docker run -itd httpd


 105  clear
  106  docker ps
  107  docker exec 175d3e949c6f ls
  108  docker exec 175d3e949c6f df
  109  clear
  110  docker exec 175d3e949c6f du
  111  clear
  112  docker exec 175d3e949c6f ps
  113  sssss
  114  clear
  115  docker exec -it 175d3e949c6f /bin/bash
  116  docker ps
  117  docker inspect 175d3e949c6f
  118  clear
  119  http://172.17.0.3
  120  curl http://172.17.0.3
  121  ps -eaf
  122  clear
  123  docker ps
  124  docker exec 175d3e949c6f ps -eaf
  125  docker run -itd ubuntu
  126  docker ps
  127  docker exec 175d3e949c6f ps -eaf
  128  docker exec de3df8a6b81f ps -eaf
  129  clear
  130  docker ps
  131  docker attach de3df8a6b81f
  132  docker ps
  133  docker attach 175d3e949c6f
  134  clear
  135  docker ps
  136  docker ps -a
  137  docker start 175d3e949c6f 7c8afaedc1f9
  138  clear
  139  docker ps -a
  140  docker ps
  141  docker run httpd
  142  clear
  143  docker run -d httpd
  144  docker ps
  145  clear
  146  docker run -itd httpd
  147  docker run -itd ubuntu
  148  docker ps
  149  clear
  150  docker ps
  151  docker container stop $(docker container ls -aq)
  152  docker rm -vf $(docker ps -a -q)
  153  clear
  154  ls
  155  docker ps
  156  docker run -d httpd
  157  docker ps
  158  docker run -d -p 80:80 httpd
  159  docker run -d -p 81:80 httpd
  160  clear
  161  docker ps
====================================================
https://www.devopsschool.com/blog/the-docker-command-line-complete-referenece/

 166  docker ps
  167  docker exec 56ef2b5d077f ls /tmp
  168  ls
  169  docker cp anaconda-ks.cfg 56ef2b5d077f:/tmp
  170  docker exec 56ef2b5d077f ls /tmp
  171  ls
  172  rm -rf anaconda-ks.cfg
  173  clear
  174  ls
  175  docker cp 56ef2b5d077f:/tmp/anaconda-ks.cfg .
  176  ls
  177  docker ps
  178  docker diff 56ef2b5d077f
  179  clear
  180  docker port
  181* docker ps
  182  docker port 56ef2b5d077f
  183  docker port 7ad0e799c881
  184  clear
  185  docker ps
  186  docker rename 7ad0e799c881 raju
  187  docker ps
  188  clear
  189  docker ps
  190  docker inspect 56ef2b5d077f
  191  clear
  192  docker logs 56ef2b5d077f
  193  curl http://172.17.0.2
  194  clear
  195  docker logs 56ef2b5d077f
  196  docker stats
  197  clear
  198  docker ps
  199  ps -eaf | grep containerd
  200  docker top 56ef2b5d077f
  201  clear
  202  docker events



Assignment - www.debug.school
---------------------
update	Update configuration of one or more containers
wait	Block until one or more containers stop, then print their exit codes