How to properly connect with worker node in docker? - docker

Question

I have docker setup as 1 Manager and 1 Worker. Both node are separate machine within a same network.
Initialized docker swarm in manager node and connected another PC to swarm using the docker swarm join-token worker code generated by manager node.
docker info Manager Node
Containers: 16
Running: 5
Paused: 0
Stopped: 11
Images: 303
Server Version: 18.03.1-ce
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Backing Filesystem: extfs
Dirs: 572
Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: active
NodeID: v5out80i284bavbkhrny82non
Is Manager: true
ClusterID: 2h6jhemo4ch03zzk9dm8hkn97
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
Force Rotate: 0
Autolock Managers: false
Root Rotation In Progress: false
Node Address: 10.0.0.1
Manager Addresses:
10.0.0.1:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 773c489c9c1b21a6d78b5c538cd395416ec50f88
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
apparmor
seccomp
Profile: default
Kernel Version: 4.13.0-37-generic
Operating System: KDE neon Developer Edition
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 7.691GiB
Name: wannamit
ID: KR2B:Q2E6:GAPR:HY6X:PYZQ:KUMU:DXCE:7YKI:E5MM:RRHO:BBWG:GM6S
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Username: amithp
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
WARNING: No swap limit support
docker info Worker Node
Containers: 4
Running: 4
Paused: 0
Stopped: 0
Images: 4
Server Version: 18.03.1-ce
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: active
NodeID: vvusfvjpenc9ymsotj4bcs25c
Is Manager: false
Node Address: 192.168.86.38
Manager Addresses:
10.0.0.1:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 773c489c9c1b21a6d78b5c538cd395416ec50f88
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
apparmor
seccomp
Profile: default
Kernel Version: 4.15.0-22-generic
Operating System: Ubuntu 18.04 LTS
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 3.093GiB
Name: ubuntu
ID: SKCQ:JZGO:VUHX:HZN5:JD4H:4KPM:5RXK:DWG2:A7E6:WU4T:VQ5N:YHQB
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
WARNING: No swap limit support
A Simple is deployed with 5 replication.
version: "3.2"
services:
webapp:
image: amithp/pyapp:latest
deploy:
replicas: 5
restart_policy:
condition: on-failure
resources:
limits:
cpus: "0.1"
memory: 50M
ports:
- "28888:28888"
networks:
- frontend-network
redis:
image: redis
command: redis-server --appendonly yes
deploy:
restart_policy:
condition: on-failure
networks:
- frontend-network
networks:
frontend-network:
external:
name: frontend-network
Deployment is a success. Mostly 2 is deployed in Manager node, 3 other and Redis is deployed over worker node. The docker image is flask app that shows total view count and origin IP from app is being served.
Hello world!
Hostname: 351d83b03555
HostIP: 10.0.0.28
Visits: cannot connect to Redis, counter disabled
Now if I visit localhost:2888 from manager node. It cannot connect to redis and only loops over 2 different IPs. I cross-checked those IP and they are from manager node. Also, I identified IP of containers in worker node and tried to ping from manager node's container, response cannot connect to host (no ping reply).
Am I doing something wrong or did I miss something?