Update Shellhttpd

The previous section, Dynamic Configuration File, shows how to send configuration files using fioctl. You also saw where the file is located on the device: /var/run/secrets/shellhttpd.conf

However, shellhttpd is not yet using this file.

You will learn how to modify docker-compose.yml so that the app uses the host machine’s /var/run/secrets/shellhttpd.conf.

Start by removing shellhttpd.conf from the Dockerfile to simplify your app:

$ vi shellhttpd/Dockerfile

FROM alpine

COPY httpd.sh /usr/local/bin/

CMD ["/usr/local/bin/httpd.sh"]

Edit docker-compose.yml and change the volumes stanza to share the /var/run/secrets folder.

$ vi shellhttpd/docker-compose.yml

version: '3.2'

services:
  httpd:
    image: hub.foundries.io/<factory>/shellhttpd:latest
#    image: shellhttpd:1.0
    restart: always
    volumes:
      - /var/run/secrets:/home/shellhttpd/
    ports:
      - 8080:${PORT-8080}
    environment:
      MSG: "${MSG-Hello world}"

Check your changes, add, commit, and push:

$ git status
$ git add shellhttpd/Dockerfile
$ git add shellhttpd/docker-compose.yml
$ git commit -m "Updating shared folder path"
$ git push

Make sure you received your update by checking the latest Target on the Devices tab in your Factory.

Once you receive the update, the Docker log will show the new message configured with Fioctl in the previous section:

$ docker logs -f shellhttpd_httpd_1

 PORT=8080
 MSG=Hello from fioctl

If you test the app with curl, it will also display the new message:

$ curl <device IP>:8080

 Hello from fioctl

Repeat the fioctl config command in the previous section to confirm everything is working. Update the configuration file using Fioctl on your host machine:

$ fioctl devices config set <device-name> shellhttpd.conf="MSG=\"New config file updated over-the-air\""

Wait, then test your app again:

$ curl <device IP>:8080

New config file updated over-the-air