Docker Swarm Configuration for InkBlink

Requirements

Tailscale Download (MAC/PC)	Download | Tailscale
Docker Swarm (PC)	Windows | Docker Docs

Docker Swarm + Tailscale

Due to conflicts between docker swarm initializing a custom network as the listening address, a tailscale image will run in a container to provide access to host as a proxy.

Steps to Initialize Tailscale Proxy (One machine in swarm cluster)

docker compose -f tailscale-compose.yaml up -d

#IPv4 Address of Container Running Tailscale (not local machine ip)
#Use this IP to initialize Docker Swarm
docker exec tailscale-proxy tailscale ip -4

To verify docker swarm has been initiated, check if port 2377 is listening

 netstat -an | grep 2377

Expected Terminal Output

$ netstat -an | grep 2377
  TCP    [::1]:2377             [::]:0                 LISTENING

Initialize Docker Swarm

#$DOCKER_IP is the result of docker exec tailscale-proxy tailscale ip -4
docker swarm init --advertise-addr "$DOCKER_IP" --listen-addr 0.0.0.0:2377

Join Docker Swarm as Manager

docker swarm join --token SWMTKN-1-59rogaer609u1iaqugvorkz12bunzew6tqanvg7ufspfrw0s85-6x9qkhzat0artan0olngl3o2c 100.79.134.37:2377

Join Docker Swarm as Worker**

docker swarm join --token SWMTKN-1-3oxsd6bvv40m77t4l5b05saajlr8u2rma54w32srpk0sjgc8h1-eufmgpayk1difcyn45ij968m0 100.79.134.37:2377

You can verify the nodes that have joined the initialized swarm using :

# Only Manager Nodes can run this command
docker node ls

Expected Terminal Output

ID                            HOSTNAME         STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
nr29nq3n9jee55zz0h43r6kxd *   docker-desktop   Ready     Active         Leader           27.5.1
nz59idgmk5grpkk9eepg42glo     docker-desktop   Ready     Active                          28.0.1

The ID column will be important in designating which node will run which service.

Deploying the Distributed System

docker stack deploy -c compose.yaml inkblink

6 services in total run in this container (for two nodes):

Service Name	Node Label
Kafka	main_services
Coordinator	main_services
Primary	primary
Backup 1	primary
Backup 2	primary
Backup 3	primary

# Designate Node Label to Node_ID
docker node ls # <-- To list NODE_IDs
docker node update --label-add role=main_services <NODE_ID> # <-- Designate Node Label to Node

envsubst < compose.yaml | docker stack deploy -c - inkblink