03-networking.sh

for i in 1 2 3; do
  docker-machine create -d virtualbox node-$i
done

eval $(docker-machine env node-1)

docker swarm init \
  --advertise-addr $(docker-machine ip node-1)

TOKEN=$(docker swarm join-token -q worker)

for i in 2 3; do
  eval $(docker-machine env node-$i)

  docker swarm join \
    --token $TOKEN \
    --advertise-addr $(docker-machine ip node-$i) \
    $(docker-machine ip node-1):2377
done

eval $(docker-machine env node-1)

docker node ls

docker service create --name go-demo-db \
  mongo:3.2.10

docker service inspect --pretty go-demo-db

docker service rm go-demo-db

docker network create --driver overlay go-demo

docker service create --name go-demo-db \
  --network go-demo \
  mongo:3.2.10

docker service inspect --pretty go-demo-db

docker service create --name util \
    --network go-demo --mode global \
    alpine sleep 1000000000

docker service ps util

ID=$(docker ps -q --filter label=com.docker.swarm.service.name=util)

docker exec -it $ID apk add --update drill

docker exec -it $ID drill go-demo-db

docker network create --driver overlay proxy

docker network ls -f "driver=overlay"

docker service create --name go-demo \
  -e DB=go-demo-db \
  --network go-demo \
  --network proxy \
  vfarcic/go-demo:1.0

docker service create --name proxy \
    -p 80:80 \
    -p 443:443 \
    -p 8080:8080 \
    --network proxy \
    -e MODE=swarm \
    vfarcic/docker-flow-proxy

docker service ps proxy

curl "$(docker-machine ip node-1):8080/v1/docker-flow-proxy/reconfigure?serviceName=go-demo&servicePath=/demo&port=8080"

curl -i "$(docker-machine ip node-1)/demo/hello"

curl -i "$(docker-machine ip node-3)/demo/hello"

NODE=$(docker service ps proxy | tail -n +2 | awk '{print $4}')

eval $(docker-machine env $NODE)

ID=$(docker ps -q \
    --filter label=com.docker.swarm.service.name=proxy)

docker exec -it \
    $ID cat /cfg/haproxy.cfg

eval $(docker-machine env node-1)

docker service scale go-demo=5

ID=$(docker ps -q --filter label=com.docker.swarm.service.name=util)

docker exec -it $ID apk add --update drill

docker exec -it $ID drill go-demo

docker-machine rm -f node-1 node-2 node-3

Might be a port issue.

docker network create --attachable --driver overlay go-demo

I needed to make the network attachable to run below.

$ docker run -e DB=go-demo-db --network go-demo -it vfarcic/go-demo:latest /bin/sh
/ # env
HOSTNAME=47a4294f8e92
SHLVL=1
HOME=/root
DB=go-demo-db
TERM=xterm
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/
/ # ping go-demo-db
PING go-demo-db (10.0.1.2): 56 data bytes
64 bytes from 10.0.1.2: seq=0 ttl=64 time=0.082 ms
64 bytes from 10.0.1.2: seq=1 ttl=64 time=0.084 ms
^C
--- go-demo-db ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.082/0.083/0.084 ms
/ # telnet go-demo-db 27017

Should the create service for mongo expose the default port?

docker service create --name go-demo-db \
  --network go-demo \
  mongo:3.2.10

Not a port issue, confirmed port exposed

nmap -p 27017 go-demo-db

Starting Nmap 7.12 ( https://nmap.org ) at 2020-01-07 17:25 UTC
Nmap scan report for go-demo-db (10.0.1.2)
Host is up (-0.20s latency).
PORT      STATE    SERVICE
27017/tcp filtered mongod
MAC Address: 02:42:0A:00:01:04 (Unknown)

Nmap done: 1 IP address (1 host up) scanned in 0.46 seconds

Some progress

The problem is with the proxy network, removing this from the service create command allows the service to be created.

$ docker service create --name go-demo    -e DB=go-demo-db    --network go-demo     vfarcic/go-demo:latest
qfqpgs962otjbulsfof0wzvnt
overall progress: 1 out of 1 tasks
1/1: running   [==================================================>]
verify: Service converged