Docker is awesome. However, more often than not I keep googling or copying from thing I previously used.
For this reason, I decided to build up a small personal cheatsheet of Docker commands/snippets. It’s primarily for my own purposes, but hey, why not share it publicly!
Commands
Note: NAME in all commands is the Container’s name.
Note: all commands are for Linux, some even Debian/Ubuntu specific.
Installing Docker on Debian/Ubuntu
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| # uninstall old version
sudo apt-get remove docker docker-engine docker.io containerd runc
# pre-install steps
sudo apt-get update
sudo apt-get install \
apt-transport-https \
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
## Standard:
echo \
"deb [arch=amd64 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
## armhf (Raspberry Pi):
echo \
"deb [arch=armhf 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
## arm64:
echo \
"deb [arch=arm64 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
# install
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io
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List Containers
Build Image with Dockerfile
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| docker build -t repo/name:tag .
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Stop and remove existing Container (CI/CD safe)
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| docker stop NAME || true
docker rm NAME || true
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Run Container in background
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| docker run -d --name=NAME repo/name:tag
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Run Container with auto-restart (like service)
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| docker run -d --name=NAME --restart=always repo/name:tag
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Prune unused Docker Images
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| docker image prune -f -a
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Expose ports
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| docker run -d --name=NAME -p [host-port]:[container-port]
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Mount directory
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| docker run -d --name=NAME -v [host-location]:[container-location]
# example:
docker run -d --name=NAME -v "/var/log/MyApp":"/logs"
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View running Container’s files
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| docker exec -i -t NAME /bin/bash
cat [file]
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View Container’s logs
Dockerfile snippets
ASP.NET Core 6.0
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| FROM mcr.microsoft.com/dotnet/aspnet:6.0
WORKDIR /app
EXPOSE 80
COPY . .
ENTRYPOINT ["dotnet", "MyApp.dll"]
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ASP.NET Core 6.0 (for armhf)
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| FROM mcr.microsoft.com/dotnet/aspnet:6.0.1-bullseye-slim-arm32v7
WORKDIR /app
EXPOSE 80
COPY . .
ENTRYPOINT ["dotnet", "MyApp.dll"]
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Keep Container running without actual Entrypoint
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| ...
ENTRYPOINT ["tail", "-f", "/dev/null"]
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Other?
This list is not exhaustive by any means, and I’ll probably keep updating it.
For now these are my most used commands and snippets.