docker container run -d -p 6379:6379 --name redis redis # run redis container in detached mode
docker container run -d -p 5000:5000 --name qna_app qna_app # run qna_app container in detached mode
docker container run -d -p 5000:5000 --name qna_app --link redis:redis qna_app # run qna_app container in detached mode and link it to redis container
docker container run -d -p 5000:5000 --name qna_app --link redis:redis -e REDIS_HOST=redis qna_app # run qna_app container in detached mode and link it to redis container and set environment variable REDIS_HOST to redis