Tuesday, March 1, 2022

Docker Security


Best practices to secure Docker containers

Regularly update Docker and host

Make sure that Docker and the host are up-to-date. Always make sure that Docker is the most up to date version. Use the updated operating system and containerization software to put a stop to security issues. Each update has security upgrades that are necessary for safeguarding the host and Docker.

Run containers as a non-root user

Running containers as a non-root helps to mitigate security vulnerabilities. Running your containers on rootless mode will verify that your application environment is safe.

It also prevents malicious content from accessing the host container. This means not everyone who has pulled your container from Docker can get access to your server.

Configure resource quotas

Resource quotas are configured on a per-container basis by Docker. They enable you to limit the number of resources (memory and CPU) that a container can consume.

Configuring resource quotas on containers increases the efficiency of your docker environment. It also prevents the imbalance of resources of the overall containers in the environment.

This feature enhances container security and makes them perform at an expected speed. If one container got infected with malicious code, it won’t let in many resources in as the quota cut it off. This further helps to minimize attacks.

Set container resource limits

Containers should have a resource limit. Setting resource limits reduces the ability of containers to consume a lot of the system’s resources. Limiting resources assigned to each container enhances security in the event of an attack.

Keep images clean

Downloading container images from untrusted sources and vendors can introduce security vulnerabilities in containers. Make sure that images downloaded from online platforms are from trusted and secure sources.

To avoid security vulnerabilities:

  • Use container images that are authentic. Check them out at Docker Hub. It is the largest Docker registry with multiple container images.
  • Make use of images that are verified by the Docker Content Trust.
  • Use Docker security scanning tools to help you identify vulnerabilities within container images.

Secure container registries

Docker container registry is a content distribution system that stores and issues images for your containers. It makes Docker much more powerful.

With registries, you can build a central repository from where you can download container images more easily and faster. There are many security risks if you fail to use a trusted registry.

Docker Trusted Registry is a legit registry. It is installed behind your firewall to mitigate the risks and breaches on the internet. Even though the registry is reachable from behind the firewall, you should deny users access to upload or download images from the registry.

Monitor API and network security

Networks and APIs play a significant role in Docker security. Docker containers communicate using APIs and networks. Communication is essential for containers to deploy and run correctly. Thus proper monitoring and security are needed.

API and network security are resources used along with Docker. These resources are also an open risk to Docker security. API and network security should be well monitored and configured to enhance Docker security.


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