Docker: Difference between revisions
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* Portability of containers should make them easier to deploy and migrate across hardware. | * Portability of containers should make them easier to deploy and migrate across hardware. | ||
* Lower resource utilisation, particularly RAM and CPU, means running a dozen containers is more realistic than the same number of VMs, especially on a developer's laptop. | * Lower resource utilisation, particularly RAM and CPU, means running a dozen containers is more realistic than the same number of VMs, especially on a developer's laptop. | ||
* Due to the sharing of resources, containers always run the same kernel as the host. | |||
Revision as of 17:10, 17 February 2019
Containers
At a high level, containers are a lightweight form of virtual machines which encapsulate an application and its dependencies. However, there are some key differences between containers and virtual machines:
- Some resources are shared with the host operating system, which reduces the overhead involved in comparison with a VM. How much overhead is debatable, especially given that hardware support for virtualisation exists on most modern CPUs, and any machine operating a server is likely to have this available and enabled.
- Portability of containers should make them easier to deploy and migrate across hardware.
- Lower resource utilisation, particularly RAM and CPU, means running a dozen containers is more realistic than the same number of VMs, especially on a developer's laptop.
- Due to the sharing of resources, containers always run the same kernel as the host.