Docker enables developers to easily pack, ship, and run any application as a lightweight, portable, self-sufficient container, which can run virtually anywhere. In nutshell, "Containers gives you instant application portability."
Follow steps from https://www.docker.com/get-started
Docker build will create docker images
git clone https://github.com/aveeva-devops/docker
javac Helloworld.java
docker build --tag "docker-hello-world:latest" .
--tag is name of docker image. This image can be used anywhere now.
Docker pull is used to pull remote image
docker pull jenkinsci/slave
docker run docker-hello-world:latest
docker run -it --rm -d -v "localdir":remotedir image_name
docker run -it --rm -d -v "/tmp":/home/user docker-hello-world:latest
docker run -it -d jenkinsci/slave
--rm will help to remove docker container once you are logged out of container -d will execute docker in backend -v volume mounted for localdir, where localdir is directory on host server
Docker exec can be used to execute command on docker container, for instance, below command will login on container
docker exec -it name_of_container bash
docker exec -it jenkins bash
Docker inspect is used to inspect meta-deta of docker services, for example, it gives information on docker containers, images etc
docker inspect name_of_container
docker inspect image
docker inspect jenkins
docker inspect jenkinsci/slave
Docker logs can be used to troubleshoot docker runtime issues, for example, docker logs dockerid will give your logs info for container
docker logs jenkins
docker logs container_id
docker images (Display docker images)
docker inspect image_name (inspect properties of image)
docker rmi image_name (remove image)
Check docker open ports
docker port container_name
Each docker connect with other docker container on a default network called bridge
Get IP Address of docker container
docker inspect --format '{{ .NetworkSettings.IPAddress }}' container_name
Check connectivity between two docker containers
docker exec -ti container_1 ping conatiner_2
docker restart container_id
docker stop container_id
docker start container_id
docker start $(docker ps -a -q)
docker inspect --format {{.GraphDriver.Data.DeviceSize}} $(docker ps -lq)
for i in $(docker ps -q); do echo $i; docker exec $i ps -eo pid,cmd,%mem,%cpu --sort=-%cpu | head -5;echo ======; done
for i in $(docker ps -a -q); do echo $i;docker exec -u 0 $i bash -c 'du -sch / 2> /dev/null'; echo "======";done
docker inspect containerid -f "{{json .NetworkSettings.Networks }}"
docker exec -it -u 0 containerid bash
Docker inspect -f '{{.State.Running}}' container_name
sudo /usr/sbin/lvs -o lv_name,data_percent,metadatapercent|awk '$1 == "docker-pool" {print $2,$3}'
docker ps -f status=exited
docker rm $( docker ps -q -f status=exited )
docker rmi $(docker images --quiet --filter "dangling=true")
docker volume rm $( docker volume ls -q -f dangling=true)
Management Commands:
builder Manage builds
config Manage Docker configs
container Manage containers
image Manage images
network Manage networks
node Manage Swarm nodes
plugin Manage plugins
secret Manage Docker secrets
service Manage services
stack Manage Docker stacks
swarm Manage Swarm
system Manage Docker
trust Manage trust on Docker images
volume Manage volumes
Commands:
attach Attach local standard input, output, and error streams to a running container
build Build an image from a Dockerfile
commit Create a new image from a container's changes
cp Copy files/folders between a container and the local filesystem
create Create a new container
deploy Deploy a new stack or update an existing stack
diff Inspect changes to files or directories on a container's filesystem
events Get real time events from the server
exec Run a command in a running container
export Export a container's filesystem as a tar archive
history Show the history of an image
images List images
import Import the contents from a tarball to create a filesystem image
info Display system-wide information
inspect Return low-level information on Docker objects
kill Kill one or more running containers
load Load an image from a tar archive or STDIN
login Log in to a Docker registry
logout Log out from a Docker registry
logs Fetch the logs of a container
pause Pause all processes within one or more containers
port List port mappings or a specific mapping for the container
ps List containers
pull Pull an image or a repository from a registry
push Push an image or a repository to a registry
rename Rename a container
restart Restart one or more containers
rm Remove one or more containers
rmi Remove one or more images
run Run a command in a new container
save Save one or more images to a tar archive (streamed to STDOUT by default)
search Search the Docker Hub for images
start Start one or more stopped containers
stats Display a live stream of container(s) resource usage statistics
stop Stop one or more running containers
tag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
top Display the running processes of a container
unpause Unpause all processes within one or more containers
update Update configuration of one or more containers
version Show the Docker version information
wait Block until one or more containers stop, then print their exit codes