💡 Cgroups = limits how much you can use (memory | CPU)
💡 namespaces = limits what you can see (Process id)
- Docker resources usage -
docker info - Know how much space is taken by a particular container
docker container ls -s - Know how much spaces is used by Docker Root Dir
du -h --max-depth=1 /var/lib/docker - Docker storage usage
docker system df - Docker list volumes
docker volume ls - Docker list images that are locally stored with the Docker Engine
docker image ls - Docker inspect volumes
docker volume inspect VOLUME NAME - Remove a group of images -
docker images | grep "<none>" | awk '{print $3}' | xargs docker rmi - Remove all untagged containers -
docker rm $(docker ps -aq --filter status=exited) - Remove all untagged images -
docker rmi $(docker images -q --filter dangling=true) - Remove old (dangling) Docker volumes -
docker volume rm $(docker volume ls -qf dangling=true) - Docker remove redundant objects at once
docker system prune - Install on Ubuntu -
curl -sSL https://get.docker.com/ubuntu/ | sudo sh - Get stats from all containers on a host -
docker ps -q | xargs docker stats - Tail last 300 lines of logs for a container -
docker logs --tail=300 -f <container_id>
Image:
- Build an image from the Dockerfile in the current directory and tag the image
docker build -t myimage:1.0 . - Pull an image from a registry
docker pull myimage:1.0 - Retag a local image with a new image name and tag
docker tag myimage:1.0 myrepo/myimage:2.0 - Push an image to a registry
docker push myrepo/myimage:2.0 - Run a container from the Alpine version 3.9 image, name the running container “web” and expose port 5000 externally, mapped to port 80 inside the container
docker container run --name web -p 5000:80 alpine:3.9 - Stop a running container through SIGTERM
docker container stop web - Stop a running container through SIGKILL
docker container kill web - List the networks
docker network ls
#!/bin/bash
set -e
#Uninstall old versions
sudo apt-get remove docker docker-engine docker.io containerd runc
#Update the apt package index:
sudo apt-get update
#Install packages to allow apt to use a repository over HTTPS:
sudo apt-get install -y \
apt-transport-https \
ca-certificates \
curl \
gnupg-agent \
software-properties-common
# Add docker's package signing key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
# Add repository
sudo add-apt-repository -y \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable"
# Install latest stable docker stable version
sudo apt-get update
sudo apt-get -y install docker-ce
# Enable & start docker
sudo systemctl enable docker
sudo systemctl start docker
# add current user to the docker group to avoid using sudo when running docker
sudo usermod -a -G docker $USER
# Output current version
docker -v#!/bin/bash
#Get Docker Engine - Community for CentOS + docker compose
set -e
#Uninstall old versions
sudo yum remove docker docker-common docker-selinux docker-engine-selinux docker-engine docker-ce
#Update the packages:
sudo yum update -y
#Install needed packages
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
# Configure the docker-ce repo:
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
# Install the latest docker-ce
sudo yum install docker-ce
# Enable & start docker
sudo systemctl enable docker.service
sudo systemctl start docker.service
# add current user to the docker group to avoid using sudo when running docker
sudo usermod -a -G docker $(whoami)
# Output current version
docker -v#!/bin/bash
# get latest docker compose released tag
COMPOSE_VERSION=$(curl -s https://api.github.com/repos/docker/compose/releases/latest | grep 'tag_name' | cut -d\" -f4)
sudo curl -L "https://github.com/docker/compose/releases/download/${COMPOSE_VERSION}/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod a+x /usr/local/bin/docker-compose
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
# Output the version
docker-compose -v
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