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docker.txt
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docker.txt
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-----------------------------------------
Installing Docker
-----------------------------------------
#Install docker on Ubuntu 20.04
sudo apt install docker.io
#Start and enable the service
sudo systemctl enable --now docker
#Add your user account to the docker group
sudo usermod -aG docker ${USER}
#Reload shell to use docker group privileges, or just reboot
su - ${USER}
-----------------------------------------
Running Docker Containers
-----------------------------------------
#Officical website of docker hub, pull command downloads/runs these containers
https://hub.docker.com/
#Pull down and run a test container named busybox with interactive (i) terminal (t) of sh (exit to end)
docker run -it busybox /bin/sh
#Check running containers (also docker container ls)
docker ps
#View a list of all docker containers (also docker container ls -a)
docker ps -a
#Pull down latest nginx container but not run it automatically
docker pull nginx
#Pull down version 1.10.3 of nginx
docker pull nginx:1.10.3
#Run docker image as a dameon in the background, detached
docker run -d <image>
#To bring docker container to forground
docker attach <container name> OR <Container ID>
#Run docker image as a dameon and always keep running
docker run -d --restart=always <image>
#Run docker as a dameon and name container
docker run --name <name> -d <image>
#Run docker as a dameon mapping local host port to container port
docker run -p <host port>:<container port> -d <image>
#Running with limited resources
docker run --cpus=.5 <image>
docker run --memory=100m <image>
-----------------------------------------
Managing Docker Containers/Images
-----------------------------------------
#Rename a docker container
docker rename <old name> <new name>
#Stop a docker container gracefully by name or id, can find from docker ps
docker stop <container name> OR <container id>
#Kill (sigterm) a docker container by name or id, can find from docker ps
docker kill <container name> OR <container id>
#Remove a docker container
docker rm <container name>
#Kill and remove a docker container, one command
docker rm -f <container name>
#To view additional details about a container, in JSON format
docker inspect <container name>
#To view additional statistics about a container
docker stats <container name>
#To view stdout logs of container when detached
docker logs <container name>
#To view history and file sizes
docker history <container name>
#Execute a command like cat to view output of docker container
docker exec <container name> cat /etc/hosts
#View a list of the docker images we have
docker images
#To remove image, first make sure no containers are running of it
docker rmi <image>
-----------------------------------------
Shared data directories
-----------------------------------------
#Map a host directory (/var/mysql) to a directory in the container for persistance
docker run -v /var/mysql:/var/lib/mysql mysql
#Add persistent volume to /var/lib/docker/volumes named mydata
docker volume create mydata
#Run docker container using volume, if does not exist will create volume (volume mount)
docker run -v mydata:/var/lib/mysql mysql
#Run docker container using differnet dir location, use abs path (bind mount)
docker run -v /data/mysql:/var/lib/mysql mysql
#Newer way to do same command
docker run --mount type=bind,source=/data/mysql,target=/var/lib/mysql mysql
-----------------------------------------
Exporting, importing, and saving
-----------------------------------------
#Export docker image to tar file
docker save <image> -o <name>.tar
#Export docker container filesystem to tar file
docker export <container> -o <name>.tar
#Example: Dumping mysql and saving it locally
docker exec <CONTAINER> /usr/bin/mysqldump -u root --password=<password> <DATABASE> > backup.sql
#Example: Restoring mysql database from dump
cat backup.sql | docker exec -i <CONTAINER> /usr/bin/mysql -u root --password=<password> <DATABASE>
-----------------------------------------
Networking with Docker Containers
-----------------------------------------
#To list docker networks
docker network ls
#Change network from bridge to none
docker run <image> --network=none
#Change network from bridge to host
docker run <image> --network=host
#Create a new bridge (internal) network for docker
docker network create --driver bridge --subnet 172.18.0.0/24 custom-isolated-network
-----------------------------------------
Building Docker Images
-----------------------------------------
#Create a DockerFile to configure settings
vi DockerFile
FROM Ubuntu #Will use latest Ubuntu, Ubuntu:18:04 if specific version is desired
CMD["echo","Test image running Apache2"]
RUN apt update #Tells container to run command starting up
RUN apt install apache2 -y #Use -y because it will not be interactive
COPY index.html /var/www/html/index.html #takes index.html in folder and copies to container location
WORKDIR /var/www/html #when attaching, starts user here
EXPOSE 80 #Opens port 80 on the container
VOLUME ["/var/www/html/test"] #creates an empty directory on container
ENTRYPOINT ["/usr/sbin/apache2ctl"] #Similar to CMD, following CMD command passes in arguements
CMD ["-DFOREGROUND"] #need to run apache in foreground to keep container running, passing into ENTRYPOINT command
#Build Docker image from DockerFile, period for current directory
docker build -t <image name> .
#Build Docker image from DockerFile, using version tag
docker build -t <image name>:<version number> .
#Run new Docker container from image
docker run <image>
-----------------------------------------
Working with Docker Hub Repository
-----------------------------------------
#Login to your dockerhub account
docker login
#Build Docker image from DockerFile, using naming dockerhub convention
docker build -t <username>/<image name> .
#Push image to Docker Hub
docker push <username>/<image>
#Use commit changes to container, similar to git protocol
docker commit -m '<insert message>' <container> <username>/<image>:<version>
#View commit history of image
docker image history <imageID>
-----------------------------------------
Working with Local Private Repository
-----------------------------------------
#Private Registry
docker login private-registry.io
docker run private-registry.io/apps/internal-app
#Deploy Private Registry
docker run -d -p 5000:5000 --name registry registry:2
docker image tag my-image localhost:5000/my-image
docker push localhost:5000/my-image
docker pull localhost:5000/my-image
docker pull 192.168.56.100:5000/my-image
-----------------------------------------
Docker Compose
-----------------------------------------
#Install docker compose on Ubuntu
sudo apt install docker-compose
#Example of docker compose file
vi docker-compose.yaml
version: '3.3'
services:
db:
image: mysql:5.7
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: somewordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
ports:
- "8000:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: wordpress
WORDPRESS_DB_NAME: wordpress
volumes:
db_data: {}
#Run docker compose configuration, must be in directory of yaml file
docker-compose up -d
#Bring docker-compose configuration down, must be in directory of yaml file
docker-compose down
-----------------------------------------
Docker Swarm
-----------------------------------------
#Infrastructure of computers to use for docker swarm
-controller/manager = 192.168.1.100
-node1 = 192.168.1.101
-node2 = 192.168.1.102
#On the controller/manager computer initialize the swarm to allow others to join
#Will produce a token for other nodes to join
docker swarm init --advertise-addr 192.168.1.100
#On node1 run the command from the output of the swarm init to join swarm
docker swarm join --token <token> 192.168.1.100:2377
#On node2 run the same command from the output of the swarm init to join swarm
docker swarm join --token <token> 192.168.1.100:2377
#To view list of computers on the swam, run the following on the manager
docker node ls
#To create docker multiple containers through out swarm, run the following on the manager
docker service create --replicas <number> --name <name> <image>
#To view swarm of containers, run the following on the manager
docker service ps <service name>
#To add more replicas, run the following on the manager
docker service scale <service name>=<number>
#To remove the containers, run the following on the manager
docker service rm <service name>