Introduction to Docker

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docker image

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docker pull centos:6.8
docker pull ubuntu:14.04
docker pull centos # downloads latest image

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docker rmi <image_id>

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# show running containers
docker ps

# show all containers (running and stopped)
docker ps -a

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# detached mode, with pseudo-tty. if pseudo-tty is not used, the container 
# will exit immediately after running as daemon
# with -d container keeps running in background as daemon
# -d Detached mode: Run container in the background
# -t Allocate a pseudo-tty

docker run -t -d centos:6.8

# specifying container memory
docker run -t -d --memory="1g" centos:6.8 

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# interactive mode
# run container, attached interactively to local command line session and run /bin/bash
# in this case, the container exits when we exit from /bin/bash

docker run -i -t centos:6.8 /bin/bash

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docker exec -it <container id or name> bash

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docker stop <container id or name>

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docker start <container id or name>

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docker rm <container name or id>

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docker run -t -d --name centos_container -p 80:80 centos:6.8

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# -v /host/directory:/container/directory 
docker run -i -t -v $(pwd):/opt centos:6.8 /bin/bash

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docker inspect <container_id> | grep IPAddress | cut -d '"' -f 4

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docker stats

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# 192.168.0.103 is host ip
docker run -t -d --add-host=docker:192.168.0.103 centos:6.8

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docker ps -aq -f status=exited

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docker ps -aq --no-trunc | xargs docker rm

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docker images -q --filter dangling=true | xargs docker rmi