Default Pedestal app doesn't work with Docker
mbba...@gmail.com
lein new pedestal-service my-app
cd my-app
lein uberjar
sudo docker build -t my-app .
docker run -p 8080:8080 my-app
But, when I navigate to localhost:8080 nothing is found by the browser. To be clear, I made no code changes from the default template.
Things I've tried, that did work:
- I've build another Docker image (based on Python).
- running `lein run`
- I've run the uberjar manually i.e. `java -jar "target/my-app-0.0.1-SNAPSHOT-standalone.jar`.
Things that didn't work include:
- Doing the same thing on a different OS. (Ubuntu vs. macOS)
- Switching to immutant and rebuilding, etc.
I've done this in the past, and it worked fine, but for some reason nothing I try to get Pedestal to run from Docker is working.
EuAndreh
On 07/04/2018 12:56 PM, mbba...@gmail.com wrote:
I'm using the default Pedestal app, building an uberjar, building a Docker image, and attempting to run it. i.e.
lein new pedestal-service my-app
cd my-app
lein uberjar
sudo docker build -t my-app .
docker run -p 8080:8080 my-app
But, when I navigate to localhost:8080 nothing is found by the browser. To be clear, I made no code changes from the default template.
When I ran the same thing, I couldn’t reach the app either:
$ curl -I localhost:8080
curl: (56) Recv failure: Connection reset by peer
When running docker
containers, the error 56 usually means that the request went
through to localhost,
but the containers bound to that port didn’t answer anything.
The default template
listen only for localhost,
not 0.0.0.0.
However, localhost
means inside the container, not outside of it.
Try changing the ::http/host
commented config in src/my_app/service.clj
from "localhost"
to "0.0.0.0"
(a sample patch is attached).
After that, the container started answering properly:
$ curl localhost:8080
Hello World!
Maybe this should be the default?