Secrets are very similar to Kubernetes ConfigMaps and Docker Swarm configs. Everything we said for configurations applies to Secrets, with a few additional features.
Both Kubernetes and Docker Swarm stores Secrets in tmpfs inside containers. From that aspect, they are equally secure. The significant difference is in the way Secrets are stored internally.
Kubernetes stores Secrets in etcd. By default, they are exposed, and we need to take extra precautions to protect them. Docker Swarm secrets are, on the other hand, more secure by default. They are synchronized between managers using SSL/TLS, and they are encrypted at rest. I prefer "secured by default" approach behind Docker Swarm secrets. In Kubernetes, we need to take extra steps to reach a similar level of security as with Docker Swarm.
On the other hand, Kubernetes...
