Docker containers not running on VM - docker

Question

I am new to Docker and I am following the 'Getting Started' documentation at the Docker site.
I am trying to run 3 containers on a VM.
OS: Centos 7.3
Docker: 17.03.1-ce
I followed the first part and could get hello-world running on a container inside the VM.
Then I moved on to the Docker compose example.
I have the following directory structure:
home
|
- docker-compose.yml
|
- docker-test
|
- app.py
- Dockerfile
- requirements.txt
The files under docker-test are from the python app example on the docker website.
With the docker-compose, I was attempting to run 3 containers of the hello-world example.
My docker-compose.yml:
version: "3"
services:
web:
image: hello-world
deploy:
replicas: 3
resources:
limits:
cpus: "0.1"
memory: 50M
restart_policy:
condition: on-failure
ports:
- "80:80"
networks:
- webnet
networks:
webnet:
Then I ran the following commands:
sudo docker swarm init
sudo docker stack deploy -c docker-compose.yml getstartedlab
sudo docker stack ps getstartedlab shows:
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
iytr4ptz3m8l getstartedlab_web.1 hello-world:latest <node1> Shutdown Complete 16 minutes ago
s5t41txo05ex getstartedlab_web.2 hello-world:latest <node2> Shutdown Complete 16 minutes ago
91iitdnc49fk getstartedlab_web.3 hello-world:latest <node3> Shutdown Complete 16 minutes ago
However,
sudo docker ps shows no containers and when I curl http://localhost:80, it can't connect.
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
What am I missing?

Answer 1

Your docker-compose.yml file says that the web service should use the hello-world image, which just prints a message & exits when run, leading to all of the containers being stopped. Presumably, you meant to instead use the image created by building docker-test/; to do this, simply replace the image: hello-world line with build: docker-test.