docker

docker/scenarios/1.install-docker-on-ubuntu-linux.md

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+# Install Docker `Using Script`
+
+```
+sudo wget https://raw.githubusercontent.com/lerndevops/labs/master/scripts/installDocker.sh -P /tmp
+sudo chmod 755 /tmp/installDocker.sh
+sudo bash /tmp/installDocker.sh
+```
+
+
+# Install Docker With `Manual Steps`
+
+```
+sudo su -
+sudo apt-get remove docker docker-engine docker.io containerd runc
+sudo apt-get update
+sudo apt-get install -y apt-transport-https ca-certificates curl gnupg-agent software-properties-common
+sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+sudo apt-get update
+sudo apt-get install -y docker-ce docker-ce-cli containerd.io
+
+## Test the installation by running a simple container:
+
+	docker run hello-world
+
+## FYI Only ## Check Available Version for Install
+
+	apt-cache madison docker-ce | awk '{print $3}'
+```

docker/scenarios/2.how-to-run-containers.md

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+### there are many docker images available on [DockerHub](https://hub.docker.com), we can just pull them & start running containers
+
+# Get Images from `DockerHub`
+```
+docker pull tomcat:latest      -- to pull a docker image from docker hub	
+
+docker image ls                -- to display the images on your local machine
+docker inspect tomcat:latest   -- to view the detaied information in JSON output
+docker image rm tomcat:latest  -- to remove a image from local machine
+docker image prune -a          -- to remove all unused images from local machine
+```	
+
+# how to run containers from a docker image 
+
+### two ways we can run the images 
+
+## run a container in `foreground mode`  
+```
+docker run tomcat:latest 
+
+Note: 
+-- the terminal will be stuck after running above commnd
+-- use Ctrl + C to come out 
+```
+## run a container in `detached mode`
+```
+docker run -d nginx:latest
+
+Note:
+-- always creates new container & detaches from the terminal you are working on ( goes in background process )) 
+```
+
+## how to see running/stopped containers 
+```
+docker ps      -- to see all running containers 
+docker ps -a   -- to see all running and exited/stopped containers
+```
+
+## container LifeCycle 
+```
+docker stop <container id>              -- to stop a container 
+docker start <container id>             -- to start a stopped container 
+docker restart <container id>           -- to restart a container 
+docker rm <container id>                -- to remove a stopped/exited container
+docker rm -f <container id>             -- to remove a container forcefully though it is in running state 
+docker inspect <container id>           -- to view detailed information about the continaer in JSON format
+``` 

docker/scenarios/3.how-to-login-to-container.md

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+## how to login/get inside a running container
+
+### Create a Container
+```
+docker run -d tomcat:latest   -- creates a new container in detached mode
+docker ps                     -- displays the running containers, note the container id
+```
+
+### login to container 
+```
+docker exec -it <container id> /bin/bash
+
+Ex: 
+    root@vm1:~# docker exec -it fda4e3ccd59d /bin/bash
+    root@fda4e3ccd59d:/usr/local/tomcat#
+```
+
+### Logout of Container 
+```
+use "exit" to come out of container 
+
+Ex: 
+    root@fda4e3ccd59d:/usr/local/tomcat# exit
+    exit
+    root@vm1:~#
+```
+

docker/scenarios/4.how-to-access-application-running-in-container.md

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+## how to access the applications running inside the container `from external world (browser)`
+
+> **services running inside a container can never be accessed direcltry, we always need to publish/expose them on to docker host while we create the containers** 
+	
+> **we need to publish/expose the services using `-P (capital)` OR `-p (small)` with in the docker run command** 
+	
+## use `-P ( capital )` 
+
+### Create a Container & Publish 
+```	
+docker run -d -P nginx 
+  -- docker will publish/expose the port number dynamically on docker host & maps with port running inside the cont
+
+docker ps 
+  -- to check the container port 
+```
+### Access Application
+```
+to access: 
+-- in the browser http://<docker-host-IP>:<exposed port>  
+-- ex: http://52.14.62.88:32768
+```	
+
+## use `-p ( small )` 
+
+### Create a Container & Publish 
+```	
+docker run -d -p 9090:80 nginx 
+  -- docker will publish/expose the port numbr as defined on docker host & maps with port running inside the cont
+
+docker ps 
+  -- to check the container port 
+```
+### Access Application
+```
+to access: 
+-- in the browser http://<docker-host-IP>:<exposed port>  
+-- ex: http://52.14.62.88:9090
+```

docker/scenarios/install-docker-compose.md

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+# Install DockerCompose
+
+### Install Using Script 
+``` 
+sudo wget https://raw.githubusercontent.com/lerndevops/labs/master/scripts/installDockerCompose.sh -P /tmp
+sudo chmod 755 /tmp/installDockerCompose.sh
+sudo bash /tmp/installDockerCompose.sh
+```
+
+### Manual Installation Steps 
+```
+sudo curl -L https://github.com/docker/compose/releases/download/$DC_VERSION/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
+sudo chmod +x /usr/local/bin/docker-compose
+```

docker/scenarios/install-docker-on-other-linux-os.md

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+# Install Docker on CentOS/Fedora/amznLinux
+
+### Install Docker `Using Script`
+
+```
+sudo wget https://raw.githubusercontent.com/lerndevops/labs/master/scripts/installDocker.sh -P /tmp
+sudo chmod 755 /tmp/installDocker.sh
+sudo bash /tmp/installDocker.sh
+```
+
+
+### Install Docker With `Manual Steps`
+
+```
+sudo yum install -y device-mapper-persistent-data lvm2
+sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+sudo yum install -y docker-ce docker-ce-cli containerd.io
+sudo systemctl start docker
+sudo systemctl enable docker
+
+## Test the installation by running a simple container:
+	docker run hello-world
+```
+
+# Add your user to the docker group
+```
+## Add your user to the docker group, giving the user permission to run docker commands:
+
+        sudo usermod -aG docker devops
+```