Highlights How Secure Containers

As part of security, Docker isolates containers and restricts them they can’t communicate with each other. Even though these are in place, still enhanced-security is needed – how Docker manages, shared it in simple terms.

Inside the Container, it holds images- 1, 2, 3, etc. The Image is a replica of the Software app, and you can keep multiple images of current and previous versions. So it is easy to version control. The need is security for your apps and operating system. This post gives you deep insights.

Docker Security Practices

In the below picture, the Docker isolates each container. Further, a container can’t communicate with another container and even the host-operating system – except for storage volumes.

Docker Security.
Highlights How Secure Containers

How Docker Handles Isolation

Though each container has separate processes, these are encapsulated in the Linux Kernel (Host Operating System). The most important is the central functions of the Linux kernel, such as Cgroups and namespaces.

The distribution of system resources (memory, CPU, bandwidth) takes place by means of a Cgroup mechanism that guarantees that each container can only consume the quota reserved for it.

Compared to Virtual Machine, the isolation in Docker is not much stricter. Due to this, an unauthorized attacker can spoil not only container data but also host operating systems’ Kernel.

Docker Security Vulnerabilities: How to Overcome it.

The Host Os kernel is prone to security. The reason is it’s libraries communicate with Docker. So an attacker who breaks container can do for Kernel also.

  1. A firewall is needed to stop attacking Host Os. You can achieve this by using the below frameworks:
    1. AppArmor allows regulating the access rights of the containers to the file system.
    2. SELinux presents a complex system of rules with which you can implement access controls to the kernel resources.
    3. Seccomp (Secure Computing Mode) monitors system calls.
  2. Restrict access to Daemon (which is the heart of Docker) to avoid security problems.
  3. The purpose of Registry is – it stores images, and you can pull them as well. So, safeguard the registry with the above frameworks.

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Author: Srini

Experienced software developer. Skills in Development, Coding, Testing and Debugging. Good Data analytic skills (Data Warehousing and BI). Also skills in Mainframe.