Network Behaviour in Swarm

The following docker stack consists of 3 containers:

• Spring Cloud Discovery Server
• Spring Cloud Config Server
• Simple Spring Boot App that connects to discovery server to find config server.

Problem encountered

When the config server registers with the discovery server, it does so with the ip address from the ingress network rather than the created demo-network. The simple boot application cannot hit that ip address on the ingress network and so it never comes online.

Versions

Spring Boot: 1.5.3 RELEASE Spring Cloud: Camden.SR6

$ docker version

Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Tue Mar 28 00:40:02 2017
 OS/Arch:      darwin/amd64

Server:
 Version:      17.05.0-ce
 API version:  1.29 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   89658be
 Built:        Thu May  4 21:43:09 2017
 OS/Arch:      linux/amd64
 Experimental: false

$ docker info

Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 22
Server Version: 17.05.0-ce
Storage Driver: aufs
 Root Dir: /mnt/sda1/var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 20
 Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
Swarm: active
 NodeID: 9x7n5pnsq03ejs84snhn9py42
 Is Manager: true
 ClusterID: q2wj5xm2d72q7el58eawycz0y
 Managers: 1
 Nodes: 2
 Orchestration:
  Task History Retention Limit: 5
 Raft:
  Snapshot Interval: 10000
  Number of Old Snapshots to Retain: 0
  Heartbeat Tick: 1
  Election Tick: 3
 Dispatcher:
  Heartbeat Period: 5 seconds
 CA Configuration:
  Expiry Duration: 3 months
 Node Address: 192.168.99.101
 Manager Addresses:
  192.168.99.101:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 9048e5e50717ea4497b757314bad98ea3763c145
runc version: 9c2d8d184e5da67c95d601382adf14862e4f2228
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 4.4.66-boot2docker
Operating System: Boot2Docker 17.05.0-ce (TCL 7.2); HEAD : 5ed2840 - Fri May  5 21:04:09 UTC 2017
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 995.8 MiB
Name: myvm1
ID: 7ROG:TY64:UKPU:IGKB:FFI4:5UXE:WFEJ:CNBQ:QWWJ:6YOV:WP4K:IWRX
Docker Root Dir: /mnt/sda1/var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
 File Descriptors: 31
 Goroutines: 133
 System Time: 2017-05-10T21:43:25.495630861Z
 EventsListeners: 0
Username: kramkroc
Registry: https://index.docker.io/v1/
Labels:
 provider=virtualbox
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false

Build and Run

Create two vms, although I only use one here:

docker-machine create myvm1
docker-machine create myvm2

Then set first to be the active one in docker-machine:

eval $(docker-machine env myvm1)

Create images on that vm using the following command in the root folder for this project:

./gradlew buildDocker

Activate swarm mode:

docker swarm init

Create overlay network for swarm:

docker network create -d overlay demo-network

Deploy the stack using the compose file:

docker stack deploy -c docker-compose.yml demostack