Containerized applications with docker swarm on GCP

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I have a project to containerize several applications (Gitlab, Jenkins, Wordpress, Python Flask app...). Currently each application runs on a Compute Engine VM each at GCP. My goal would be to move everything to a cluster (Swarm or Kubernetes).

However I have different questions about Docker Swarm on Google Cloud Platform:

  • How can I expose my Python application on the outside (HTTP load balancer) as well as the other applications only available in my private VPC ?
  • From what I've seen on the internet, I have the impression that docker swarm is very little used. Should I go for a kubernetes cluster instead ? (I have good knowledge of Docker/Kubernetes)
  • It is difficult to find information about Docker Swarm in cloud providers. What would be an architecture with Docker Swarm on GCP?

Thanks for your help.

docker-swarm google-compute-engine docker google-cloud-platform
1 Answers

I'd create a template and from that an instance group for all VM, which shall host the Docker swarm. And a separate instance or instance group for said internal purposes - so that there is a strict separation, which can then be used to route the internal & external traffic accordingly (this would apply in any case). Google Kubernetes Engine is about the same as such an instance group, but Google managed infrastructure. See the tutorial, there's not much difference - except that it better integrates with gcloud & kubectl. While there is no requirement to want or need to maintain the underlying infrastructure, GKE is probably less effort.

What you are basically asking is:

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