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I am currently using Terraform almost like Docker Compose to manage about ~5 services + a database + Redis in Docker containers. When I do a deploy, I swap vers

I am currently using Terraform almost like Docker Compose to manage about ~5 services + a database + Redis in Docker containers. When I do a deploy, I swap version 0.0.1 for version 0.0.2 for example and it brings 0.0.1 down, then brings 0.0.2 up (aka, not very rolling deploy like). How would I migrate that to Swarm? I'm not using AWS/GCP/any of that. Just locally hosted Docker containers.

KronisLV 5y ago
This is probably a good starting point: https://docs.docker.com/engine/swarm/swarm-tutorial/ https://docs.docker.com/engine/swarm/swarm-tutorial/ Essentially, if you already have a node or multiple nodes that have Docker, you can initialize a swarm with: docker swarm init --advertise-addr <MANAGER-IP> And, optionally, add nodes as workers to the cluster: docker swarm join --token <JOIN-TOKEN> <MANAGER-IP>:2377 And then you can deploy stacks: docker stack deploy --compose-file docker-compose.yml my_stack Here's a tutorial about stacks: https://docs.docker.com/engine/swarm/stack-deploy/ https://docs.docker.com/engine/swarm/stack-deploy/ You'll probably want to read up on the Compose specification and the values that Docker Swarm and Docker Compose support since last i checked there were some differences in v2 / v3 (which many people still use): https://docs.docker.com/compose/compose-file/ https://docs.docker.com/compose/compose-file/ Of course, if you want a less steep learning curve for actually running Swarm, depending on your personal preferences (GUI vs CLI), you might want to have a look at Portainer, which is a lovely and simple dashboard: https://www.portainer.io/ https://www.portainer.io/ From there, it should mostly be a matter of running multiple replicas of each of your services and doing rolling updates, while having a stable load balancer in front of everything: https://docs.docker.com/compose/compose-file/compose-file-v3/#update_config https://docs.docker.com/compose/compose-file/compose-file-v3... Also, you'll probably want health checks because Swarm can then route traffic to containers only after they have truly started: https://docs.docker.com/compose/compose-file/compose-file-v3/#healthcheck https://docs.docker.com/compose/compose-file/compose-file-v3...

KronisLV 5y ago

This is probably a good starting point: https://docs.docker.com/engine/swarm/swarm-tutorial/ https://docs.docker.com/engine/swarm/swarm-tutorial/ Essentially, if you already have a node or multiple nodes that have Docker, you can initialize a swarm with: docker swarm init --advertise-addr <MANAGER-IP> And, optionally, add nodes as workers to the cluster: docker swarm join --token <JOIN-TOKEN> <MANAGER-IP>:2377 And then you can deploy stacks: docker stack deploy --compose-file docker-compose.yml my_stack Here's a tutorial about stacks: https://docs.docker.com/engine/swarm/stack-deploy/ https://docs.docker.com/engine/swarm/stack-deploy/ You'll probably want to read up on the Compose specification and the values that Docker Swarm and Docker Compose support since last i checked there were some differences in v2 / v3 (which many people still use): https://docs.docker.com/compose/compose-file/ https://docs.docker.com/compose/compose-file/ Of course, if you want a less steep learning curve for actually running Swarm, depending on your personal preferences (GUI vs CLI), you might want to have a look at Portainer, which is a lovely and simple dashboard: https://www.portainer.io/ https://www.portainer.io/ From there, it should mostly be a matter of running multiple replicas of each of your services and doing rolling updates, while having a stable load balancer in front of everything: https://docs.docker.com/compose/compose-file/compose-file-v3/#update_config https://docs.docker.com/compose/compose-file/compose-file-v3... Also, you'll probably want health checks because Swarm can then route traffic to containers only after they have truly started: https://docs.docker.com/compose/compose-file/compose-file-v3/#healthcheck https://docs.docker.com/compose/compose-file/compose-file-v3...