question 1: {explaination} STEP 1 : first for building an image, we initially create a dockerfile STEP 2 : we follow the syntax of dockerfile step 3 : FROM : image name step 4 : ENV : This specefies the environment variables like username,password step 5 : RUN : make directory and we specify the directory step 6 : CMD : specifies the instruction that is to be executed when a Docker container starts

question 2a: {explaination} STEP 1 : Initially we first create a network using docker create network network_name STEP 2 : Then we connect the two running containers(application container and database container STEP 3 : then both the containers are connected to each other and are present in the local host

question 6:{explaination} for connecting two or more containers easily can be done using the dockercompose method STEP 1 : intially we create a file in .yaml STEP 2 : then we specify the version (which indicates the version of dockercompose file STEP 3 : then we type services: STEP 4 : Mention the container name STEP 5 : Mention the ports, environment variables STEP 6 : Then we repeat these steps for each container