Docker commands

DockerCommands.md

Description	Command	Comments
check if docker daemon is running	systemctl status docker
start docker daemon in systemd unix systems	sudo systemctl start docker
start docker daemon manually	dockerd
Display system wide information regarding the Docker installation	docker info
hello world test	docker run hello-world
run by mapping ports	docker run -p 9090:80 --name hwNginx1 kitematic/hello-world-nginx	"hwNginx1 is the container name,
kitematic/hello-world-nginx is image name
for -p option, first one is host port which is mapped to docker port specified after colon(:)"
>> from podman registry	docker run -p 9090:80 --name hwNginx1 quay.io/aptible/nginx
>>run by specifying environment variable	docker run -e MYVAR=myprop --name hwNginx1
>>run by mapping storage volumes	docker run -v HOST_PATH:CONTAINER_PATH kitematic/hello-world-nginx
get interactive shell inside container	docker exec -it hwNginx1 sh
attach your terminal’s standard input, output, and error (or any combination of the three) to a running container using the container’s ID or name	docker attach CONTAINER_NAME_OR_ID	to detach use CTRL-p CTRL-q key sequence
>> docker attach example	"docker run -d --name topdemo ubuntu /usr/bin/top -b
docker attach topdemo"
see container instance configuration	docker container inspect hwNginx1
stop running container	docker stop hwNginx1
>>stop all containers	docker stop $(docker ps -q)
start stopped container	docker start hwNginx1
list local images	docker images
>>alternative command	docker image ls
list running containers	docker container ls
>>this command also works	docker ps
list all containers including stopped ones	docker container ls -a
>>this command also works	docker ps -a
see container logs	docker logs hwNginx1
>>tail container logs (get live container logs in the terminal)	docker logs -f hwNginx1
see help for docker command	docker --help
>>eg:	docker run --help
remove container permanently	docker rm hwNginx1
>>remove all stopped containers	docker rm $(docker ps -q --filter status=exited)
>>remove all containers	docker rm -f $(docker ps -a -q)
remove local image	docker image rm kitematic/hello-world-nginx
>>alternative command	docker rmi kitematic/hello-world-nginx
>>delete all images	docker rmi $(docker images -q)
>>delete untagged (dangling) images	docker rmi $(docker images -q -f dangling=true)
>>delete unused images older than 3 months ( interactive )	"docker image prune -a --filter ""until=$((3 * 730))h"""	use -f for non interactive
run container and delete after exit	docker run --name auto_deleted_container --rm hello-world	Clean up (--rm)
run a docker container if not already running	docker start nginx
display detailed information about image	docker image inspect hello-world
suspend all processes in container	docker pause hwNginx1
resume all processes in container	docker unpause hwNginx1
docker stop vs pause	"docker pause sends SIGSTOP signal to the container process,
whereas docker stop will send SIGTERM signal to the process, after a grace period will receive SIGKILL"
listen to docker events	docker events	"docker events
2021-05-17T11:50:43.261440400+05:30 container pause cbacf5758ec7235b59a92a85be5591dc85d9ca5b401b89b8e77ba7d1e7dfcd65 (image=kitematic/hello-world-nginx, name=hwNginx1)
2021-05-17T11:51:05.117315400+05:30 container unpause cbacf5758ec7235b59a92a85be5591dc85d9ca5b401b89b8e77ba7d1e7dfcd65 (image=kitematic/hello-world-nginx, name=hwNginx1)"
list volumes of docker container	docker inspect -f '{{ .Mounts }}' containerid	docker inspect -f '{{ .Mounts }}' $(docker ps -a
remove all dangling volumes	docker volume rm $(docker volume ls -f dangling=true -q)
build image from docker file in current directory	docker build -t imageTag .
run mongodb container	docker run -p 27017:27017 --name mongodbcntnr1 -e MONGO_INITDB_ROOT_USERNAME=mongoadmin -e MONGO_INITDB_ROOT_PASSWORD=secret -v /Users/manobhat/MyFiles/program_files/mongodb-data:/data/db -d mongo
connecting to running mongodb in container	docker exec -it mongodbcntnr1 bash
>> run mongo client inside container bash	"mongo --host localhost \
-u mongoadmin \
-p secret \
--authenticationDatabase admin \
admin"	"mongo --host $(hostname) \
-u mongoadmin \
-p secret \
--authenticationDatabase admin \
admin"
copy file inside container to outside	"#9a9e056e2639 is container id, got by executing docker ps -a OR use container name (easier option)
docker cp 9a9e056e2639:/scratch/software/mw_local/FMWTOOLS_12.2.1.5.0_GENERIC_210715.1527.2193.S_PATCHES4FA_FMW12C_PLATFORMS_JDK64/fadocker/mw_home_standalone/user_projects/domains/fusion_domain/servers/AdminServer/adr/diag/ofm/fusionapps/ORA_FSCM_SERVICESAPP/incident/incdir_29/readme.txt /scratch/public_shared/"	docker cp $(docker ps -a	tail -1
copy file from outside machine to docker container	docker cp -r /scratch/tmp/EQUK_TEST_Metadata $(docker ps -a	tail -1
create a network	docker network create my-net
remove a network	docker network rm my-net
create a container and connect it to network	"docker create --name my-nginx \
--network my-net \
--publish 8080:80 \
nginx:latest"
connect a running container to network	docker network connect my-net my-nginx
disconnect container from a network	docker network disconnect my-net my-nginx
podman machine commands (mac and windows)
list all vms for running containers	podman machine list
initialize a default virtual machine	podman machine init
If you are using podman behind a proxy then set HTTP_PROXY env variable and then do podman machine start, then proceed with podman-compose up
start default linux vm for running containers	podman machine start
stop default linux vm for running containers	podman machine stop
start containers as configured in docker-compose.yaml	docker-compose up	podman-compose -f docker-compose.yaml up
>> specifying compose file	docker-compose -f docker-compose-test.yml down
>> specifying project name	docker-compose -f 2docker-compose.yaml -p boss-project2 up
stop and remove containers as configured in docker-compose.yaml	docker-compose down	podman-compose -f docker-compose.yaml down
>> or press ctrl+c in the running docker-compose terminal
>> in podman	podman-compose -f docker-compose.yaml up
	podman-compose -f docker-compose.yaml down

DockerNetworkingTutorialCommands.sh

#viewing containers and using default bridge network
docker network ls

docker network inspect podman
docker network inspect bridge

docker run -dit --name alpine1 alpine ash
docker run -dit --name alpine2 alpine ash

docker attach alpine1
ip addr show
ping -c 2 google.com
ping -c 2 alpine2

docker container stop alpine1 alpine2
docker container rm alpine1 alpine2

#user defined network
#User-defined bridges provide automatic DNS resolution between containers.
#Containers on the default bridge network can only access each other by IP addresses
docker network create --driver bridge alpine-net
docker network inspect alpine-net

docker run -dit --name alpine1 --network alpine-net alpine ash
docker run -dit --name alpine2 --network alpine-net alpine ash
docker run -dit --name alpine3 alpine ash
docker run -dit --name alpine4 --network alpine-net alpine ash
docker network connect bridge alpine4

docker network inspect bridge
docker network inspect alpine-net

docker container attach alpine1
#below pings should be successful
ping -c 2 alpine2
ping -c 2 alpine4
ping -c 2 alpine1
ping -c 2 google.com

#bad address for below
ping -c 2 alpine3
#cannot ping alpine3 even by its ip address

docker container attach alpine4
#below pings should be successful
ping -c 2 alpine1
ping -c 2 alpine2
ping -c 2 alpine4

#bad address for below
ping -c 2 alpine3
#but can ping alpine3 by its ip address
#since alpine4 is connected to both bridge and alpine-net networks

#cleanup
docker container stop alpine1 alpine2 alpine3 alpine4
docker container rm alpine1 alpine2 alpine3 alpine4
docker network rm alpine-net