dockercommand.txt

docker run <image name>  - your container will be created 
docker run -d <image name> - runs your image in detached mode
docker ps    -- running container
docker ps -a -- all containers (exited running)
docker ps -q -- all the container ids (running)
docker ps -qa -- all containers ids (exer run --name anup ited running)
docker run -d name containernam imagename  - gives auth name to your container (while cont is running)
docker rename  (cont id 809)  (newname of cont b24) - to rename exiting cont
docker start <container id> - to start the container
docker stop <container id> - to stop the container
docker rm <container id> - to remove container
docker exec -it <container id> bash - can enter into existing container or run any command in it.
docker exec <container id> command - without goin inside container you can execute command inside it
docker run  -it <image name> command(bash or sh) - can enter inside container or can execute any command into cont
docker run  <image name> <command> - can execute command in running container
docker stats container_id - will give you container stats
docker inspect container_id

port mapping
docker run -p -d 80:80 nginx --- will port map with container's port with hosts port
docker run  -d -P nginx -- will give map with container's port with hosts random port

docker cp source destination - copies file from source to destination
docker cp source file container_id:/usr/local/nginx/html/index.html
/usr/local/apache2/htdocs/html/index.html

docker rm -f `docker ps -qa` - will remove all container at once
docker rmi -rf `docker ps -qa` - will remove all images
docker logs containerid - logs of container
docker stats containerid - docker conatainer stats
docker top containerid  - docker container id top process viewer
#docker rmi -f $(docker images -q) - will delete all images at once
#docker rm -f $(docker ps -a -q)  - will delete all container at once
docker run  = pull  + create + save

DOCKER IMAGES
172.17.0.2
docker build Dockerfilelocation - builds docker image

basic syntax of docker file -
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INSTRUCTION arguments
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LABEL  KEY = VALUE     - gives metadata ,label ,identity ,labels are visible by docker inspect
for eg 
LABEL  devops = "Anup"
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FROM  baseimagename  -  provides a baseimage on which layers are created or ran
for eg
FROM centos:7
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RUN command         - Run instruction to start and create the required file structure 
                      that you need and install some required software dependencies
for eg
RUN yum install httpd -y

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EXPOSE port       - exposing the container to a port 
for eg
EXPOSE 80
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CMD   defines the command that launches the process , that you want to run within container
for eg- can be overridden , replced as well

CMD ["executable","param1","param2"]
CMD ["httpd" , "-DFOREGROUND"]

CMD command param1 param2 
CMD httpd -DFOREGROUND
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WORKDIR  - you can change the working directory in the image for remainig build instructions
WORKDIR pathhway of destination
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COPY    - is used to copy files from the local system into your image.
COPY source destination
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ADD     - is used when you want to retrieve data from remote location into your image and
          container.

ADD source destination 
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USER 
USER root - preferance of user can be performed using this argument.
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ENTRYPOINT  - the mentioned executable using Entrypoint.
              by default the mentioned executable will and can be replace only and only by 
              sudo docker run --entrypoint [new_command] [docker_image] [optional:value] , i.e
              entrypoint flag only.  
ENTRYPOINT ["executable" , "param1"]
ENTRYPOINT  executable param1 param2 
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HEALTHCHECK - checking health of container on startup
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SOURCE - H/W
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ENV    - to pass variables
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ARG    - to pass enviornment variables
ARG <name>[=<default value>]
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SHELL - set default shell to image
SHELL SHELL ["powershell", "-command"]
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volume
volume [/mnt] - create volume mounts 
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STOPSIGNAL - kind of working like kill -9 will stop the container process.
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ONBUILD - to provide instruction during when image is used in build.
ONBUILD instruction
ONBUILD RUN echo "this image is now built"
ONBUILD RUN yum install httpd -y
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Docker Network
DOCKER network drivers or docker network types
bridge - to connect two different networks , create bridge between two diff networks.
(eg communication between host and docker container is possible because of bridge)
overlay - to communicate two containers that are present in two seprate networks(hosts) using
docker swarm.
none -  doesnt have any ip attached to it to keep your container completely isolated and 
ensure this container is kept as a backup container.
host -  the container will get host ip that is localhost ip 
macvlan - to give physical identity , to make appear as physical ,allocating physical
address to container
IPvlan - we use this network to provide ipv4 and ipv6 addresss of our choice or
assign customize ip to container,i.e take control over ipv4 or ipv6 assigning.

Dockernetwork commands
docker network create --subnet "192.168.0.0/16" --driver bridge newnetwork 
docker network ls 
docker run -d -P --network newnetwork nginx
docker run -d -p --network host httpd
docker run -d -p --network <network_driver_type> image name
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Docker Volume
docker volume ls
docker volume create newvol1
docker run -d -p -v newvol1:/usr/local/apache2/htdocs/  httpd
docker run -d -p -v newvol1:/usr/share/nginx/html/  nginx
root dir location - /var/lib/docker/volumes
mkdir /mnt/voldir
docker -d -p -v /mnt/voldir:/usr/local/tomcat/ tomcat
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Docker Compose
basic command to run docker Compose
A compose file will ensure that you dont need to run commands and its configurations
over and over you just need to have a config file and using that file you will keep on building
you containers.
docker compose up .   - where your compose file is present
docker compose down . 
docker compose prune  


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Docker registory

docker login
docker tag imagename dockerhubusername/repositoryname:tag   #image name and repo name should be same
docker run username/nameofrepo:tag
docker image push anupdudhe/dockercomposenginx-frontendnginxfirst:latest