++++++++++++++
To start mysql as container, open interactive terminal in it, create a sample table.
docker run –name mydb -d -e MYSQL_ROOT_PASSWORD=sunil mysql:5
docker container ls
I want to open bash terminal of mysql
docker exec -it mydb bash
To connect to mysql database
mysql -u root -p
enter the password, we get mysql prompt
TO see list of databases
show databases;
TO switch to a databse
use db_name
use mysql
TO create emp tables and dept tables
exit
exit
exit
++++++++++++++++++
Multi container architecture using docker
This can be done in 2 ways
1) –link
2) docker-compose
1) –link option
Use case:
Start two busybox containers and create link between them
Create 1st busy box container
docker run –name c10 -it busybox
/ #
How to come out of the container without exit
( ctrl + p + q)
Create 2nd busy box container and establish link to c1 container
docker run –name c20 –link c10:c10-alias -it busybox ( c10-alias is alias name)
/ #
How to check link is established for not?
/ # ping c1
Ctrl +c ( to come out from ping )
( ctrl + p + q)
+++++++++++++++++++++++++++++++++
Ex 2: Creating development environment using docker
Start mysql as container and link it with wordpress container.
Developer should be able to create wordpress website
1) TO start mysql as container
docker run –name mydb -d -e MYSQL_ROOT_PASSWORD=sunil mysql:5
( if container is already in use , remove it
docker rm -f mydb )
Check whether the container is running or not
docker container ls
2) TO start wordpress container
docker run –name mysite -d -p 5050:80 –link mydb:mysql wordpress
13.232.183.233:5050
Check wordpress installed or not
Open browser
public_ip:5050
18.138.58.3:5050
++++++++++++++++++++++++++++++++++++++++++++++
Ex 3: Create LAMP Architecture using docker
L — linux
A — apache tomcat
M — mysql
P — php
( Linux os we already have )
Lets remove all the docker containers
docker rm -f $(docker ps -aq)
docker container ls ( we have no containers now )
1) TO start mysql as container
docker run –name mydb -d -e MYSQL_ROOT_PASSWORD=sunil mysql:5
2) TO start tomcat as container
docker run –name apache -d -p 6060:8080 –link mydb:mysql tomee
TO see the list of containers
docker container ls
To check if tomcat is linked with mysql
docker inspect apache ( apache is the name of the container )
3) TO start php as container
docker run –name php -d –link apache:tomcat –link mydb:mysql php
++++++++++++++++++++
Ex 4:
Create CI-CD environment, where jenkins container is linked with two tomcat containers.
Lets delete all the container
docker rm -f $(docker ps -aq)
To start jenkins as a container
docker run –name devserver -d -p 7070:8080 jenkins/jenkins
to check jenkins is running or not?
Open browser
public_ip:7070
http://18.138.58.3:7070
We need two tomcat containers ( qa server and prod server )
docker run –name qaserver -d -p 8080:8080 –link devserver:jenkins tomee
to check the tomcat use public_ip but port number will be 8080
http://18.138.58.3:8080
docker run –name prodserver -d -p 9090:8080 –link devserver:jenkins tomee
to check the tomcat of prodserver
http://18.138.58.3:9090
+++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++
Creating testing environment using docker
Create selenium hub container, and link it with two node containers.
One node with firefox installed, another node with chrome installed.
Tester should be able to run selenuim automation programs for testing the application on multiple browsers.
To delete all the running containers
docker rm -f $(docker ps -aq)
In Browser — open – hub.docker.com
Search for selenium
We have a image – selenium/hub
To start selenium/hub as container
docker run –name hub -d -p 4444:4444 selenium/hub
In hub.docker.com
we also have- selenium/node-chrome-debug ( It is ubuntu container with chrome)
To start it as a container and link to hub ( previous container)
docker run –name chrome -d -p 5901:5900 –link hub:selenium selenium/node-chrome-debug
In hub.docker.com
we also have- selenium/node-firefox-debug
To start it as a container and link to hub ( It is ubuntu container with firefox)
docker run –name firefox -d -p 5902:5900 –link hub:selenium selenium/node-firefox-debug
To see the list of container
docker container ls
Note: firefox and chrome containers are GUI containers.
To see the GUI interface to chrome / firefox container
Download and install vnc viewer
In VNC viewer search bar
public_ip_dockerhost:5901
18.136.211.65:5901
Password – secret
++++++++++++++++++++++++++++++++++++++++++++++++++++++
All the commands we learnt till date are adhoc commands.
In the previous usecase we have installed two containers ( chrome and firefox)
Lets say you need 80 containers?
Do we need to run 80 commands?
Instead of 80 commands, we can use docker compose
++++++++++++++++++++++++
Docker compose
This is a feature of docker using which we can create multicontainer architecture using yaml files. This yaml file contains information about the containers that we want to launch and how they have to be linked with each other.Yaml is a file format. It is not a scripting language.
Yaml will store the data in key value pairs
Lefthand side – Key
Righthand side – Value
Yaml file is space indented.
Sample Yaml file
logiclabs:
trainers:
sunil: Devops
raj: Python
Coordinators:
lakshmi: Devops
rani: AWS
…
++++++++++++++++++++++
logiclabs — root element
+++++++++++++++++++++++++
To validate the abvove Yaml file
Open http://www.yamllint.com/
Paste the above code — Go button
++++++++++++++++++++++++++
Installing Docker compose
1) Open https://docs.docker.com/compose/install/
2) Go to linux section
Copy and pase the below two commands
sudo curl -L “https://github.com/docker/compose/releases/download/1.24.0/docker-compose-$(uname -s)-$(uname -m)” -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
How to check docker compose is installed or not?
docker-compose –version
+++++++++++++++++++++++++