Docker

Information

Installation

CentOS

# CentOS / RockyLinux
sudo yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine
# Fedora
sudo dnf remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-selinux docker-engine-selinux docker-engine

# CentOS / RockyLinux
sudo dnf install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
# Fedora
sudo dnf install -y dnf-plugins-core
sudo dnf config-manager --add-repo https://download.docker.com/linux/fedora/docker-ce.repo

# Fedora
sudo dnf install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
# CentOS / RockyLinux
sudo dnf install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

sudo systemctl start docker
sudo systemctl enable docker
sudo usermod -a -G docker USERNAME
docker run hello-world

# Example
docker run \
    --name jenkins-docker \
    --rm \
    --detach \
    --privileged \
    --network jenkins \
    --network-alias docker \
    --env DOCKER_TLS_CERTDIR=/certs \
    --volume jenkins-docker-certs:/certs/client \
    --volume jenkins-data:/var/jenkins_home \
    --publish 2376:2376 \
    docker:dind \
    --storage-driver overlay2

Build image

docker build .
docker build --progress=plain -f Dockerfile .
docker build --no-cache --progress=plain -f Dockerfile .

Debian

Windows

https://docs.microsoft.com/en-us/windows/wsl/install-manual#step-4—download-the-linux-kernel-update-package

1. WSL2 Linux kernel update package for x64 machines : https://wslstorestorage.blob.core.windows.net/wslblob/wsl_update_x64.msi
2. https://docs.docker.com/desktop/windows/install/

Build example

set BUILDKIT_PROGRESS=plain
set DOCKER_BUILDKIT=0
set IMAGE_NAME=xyz-api
set IMAGE_VERSION=1.0.0-SNAPSHOT
cd C:\sources\xyz-api
# Remove all, that is not under source controll
git clean -fdx
docker build -t "docker.hub.io/setmy-info/%IMAGE_NAME%:%IMAGE_VERSION%" -f ./Dockerfile .
docker image tag "docker.hub.io/setmy-info/%IMAGE_NAME%:%IMAGE_VERSION%" docker.hub.io/setmy-info/%IMAGE_NAME%:latest
docker container rm %IMAGE_NAME%
docker run --name %IMAGE_NAME% --network="minikube"  -p 7080:8080 -d docker.hub.io/setmy-info/%IMAGE_NAME%:latest

Configuration

Docker compose

Possibly not needed anymore, because it is integrated into docker.

Docker compose

sudo curl -L "https://github.com/docker/compose/releases/download/1.23.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
docker-compose --version

To run docker compose:
    docker-compose up
    Option --file can be used.
To scale:
    docker-compose up --scale microservice-xyz=3

Docker Ignore

.dockerignore

node_modules

Portainer

docker volume create portainer_data
docker run --name portainer -d -p 9000:9000 -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer
firefox --new-tab http://localhost:9000/#/init/admin
For example: User: admin, Password: adminadmin

Docker Registry

docker run -d -p 5000:5000 --restart=always --name registry registry:2
docker run -d -p 5000:5000 --restart=always --name registry -v /mnt/registry:/var/lib/registry registry:2

Dockerize Postgresql

Dockerize Postgresql

Usage, tips and tricks

docker pull centos
docker image list
docker image list --no-trunc
docker images --no-trunc
docker image rm 41e53a126a5d

docker container list -a
docker container stop aa467bdcd223
docker container rm aa467bdcd223

docker system prune -a
docker container prune
docker volume prune
docker network prune
docker system prune
docker images -f dangling=true

docker container list --all
docker image list --all
docker image ls
docker volume ls
docker network ls
docker info

docker container stop minikube
docker container rm minikube
docker volume rm minikube
docker network rm minikube

docker volume create pg-data
# docker volume create pg-data:/var/lib/postgresql/data

docker run --name postgis -p 5432:5432 --restart always -v pg-data:/var/lib/postgresql/data -e POSTGRES_PASSWORD=g6p8 -d postgis/postgis

docker run --gpus all --name IMAGE_NAME -v "${DOCKER_HOST_DIR}":/var/opt/setmy.info/data --rm docker.hub/setmy.info/IMAGE:VERSION

docker run -d --name jenkins -p 2376:8080 -v jenkins-data:/var/lib/jenkins setmyinfo/setmy-info-rocky-java-jenkins:latest
docker exec -u root -it jenkins /bin/sh
docker cp jenkins:/var/lib/jenkins.tar.gz ./jenkins.tar.gz

sudo nano /etc/systemd/system/docker.service.d/http-proxy.conf

[Service]
Environment="HTTP_PROXY=http://cache.example.com:8080/"
Environment="HTTPS_PROXY=http://cache.example.com:8080/"
Environment="NO_PROXY=localhost,127.0.0.1,0.0.0.0"

nano ~/.docker/config.json

{
    "proxies": {
        "default": {
            "httpProxy": "http://127.0.0.1:3001",
            "httpsProxy": "http://127.0.0.1:3001",
            "noProxy": "*.test.example.com,.example2.com"
        }
    }
}

Composer

Saved previous examples

docker-compose.yml

services:
    microservice-postgres:
        #image: postgres:16.4
        image: postgres:16.4
        container_name: microservice-postgres
        restart: always
        environment:
            POSTGRES_USER: microservice
            POSTGRES_PASSWORD: g6p8
            POSTGRES_DB: microservice-db
        volumes:
            - postgres-data:/var/lib/postgresql/data
        ports:
            - '5432:5432'

volumes:
    postgres-data:

docker compose start
docker compose stop

psql -h localhost -p 5432 -U postgres -d postgres -W
# P: g6p8

Docker connection problem

[has@robot ~]$ docker run hello-world
docker: Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?.
See 'docker run --help'.
[has@robot ~]$ unset DOCKER_HOST
[has@robot ~]$ docker run hello-world

Hello from Docker!
...

Export to tar.gz and import from tar.gz

docker save -o image.tar image_name:tag
gzip image.tar
docker load -i image.tar.gz
docker images
docker tag <image_id> image_name:tag

docker login --username USERNAME --password PERSONAL_TOKEN

See progress of stream

docker push image_name:tag | pv -s file_size

Start shell by image

docker run -it <image_name> /bin/sh

See also

User usage

docker run options

Docker Registry

Harbor