Docker related commands

目录

Install docker on ubuntu

Uninstall docker

Maintain hard drive in case /var/lib/docker used up space

Backup/Restore dockerized postgreSQL database

Persiste postgreSQL data to volume

Run Python script with Python docker

---

Install docker on ubuntu

sudo apt-get update

sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get update

sudo apt-get install docker-ce docker-ce-cli containerd.io

sudo docker run hello-world

Uninstall docker

sudo apt-get purge docker-ce docker-ce-cli containerd.io

sudo rm -rf /var/lib/docker

sudo rm -rf /var/lib/containerd

Maintain hard drive in case /var/lib/docker used up space

docker system prune --all --volumes --force

truncate -s 0 /var/lib/docker/containers/*/*-json.log

find /var/lib/docker/containers/ -type f -name “*.log” -delete

Backup/Restore dockerized postgreSQL database

Backup

docker exec -t your-db-container pg_dumpall -c -U postgres > dump_`date +%d-%m-%Y"_"%H_%M_%S`.sql

Restore

cat your_dump.sql | docker exec -i your-db-container psql -U postgres

Persiste postgreSQL data to volume

volumes:
  - ./postgres-data:/var/lib/postgresql/data

Run Python script with Python docker

Build the python image

FROM python:3

WORKDIR /usr/src/app

COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

In the requirements.txt file, input the module names you want to use.

Then build the docker with a tag

docker build -t my-python-app .

You can run the py script directly

docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp yourTagOfDocker python your-daemon-or-script.py