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Add Docker's official GPG key

 While installing Docker on Linux machine we need to add Docker's official GPG key.

Question is ... Why we need to Add Docker's official GPG key?


--- Adding Docker's official GPG (GNU Privacy Guard) key is an essential step in verifying the integrity and authenticity of Docker packages when installing Docker on a system, especially in Linux environments.





Before you install Docker Engine for the first time on a new host machine, you need to set up the Docker repository. Afterward, you can install and update Docker from the repository.

Example: Set up Docker's apt repository.

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

Here’s why it’s necessary:

  • Security and Trust:

The GPG key is a unique cryptographic signature Docker provides to ensure that any packages you download, like docker-ce (Docker Community Edition), come directly from Docker and haven’t been tampered with. Adding this key to your system's keyring enables your package manager to verify that Docker’s packages are legitimate.

  • Integrity Verification:

When you install Docker, your package manager (like apt on Ubuntu or yum on CentOS) checks the GPG key against the package. If the signature on the package matches the Docker GPG key, you can be sure that the package hasn’t been altered or corrupted.

  • Avoiding Man-in-the-Middle (MitM) Attacks:

By verifying packages with Docker’s GPG key, you protect against potential MitM attacks where malicious parties could intercept your package download and replace it with a compromised version.


In summary, adding Docker's GPG key is about ensuring that your Docker installation is safe, untampered, and directly from Docker’s official source.

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