Hostnames Can't Resolve

[coreyog]

I had everything set up and working to the point that I stopped managing my docker installation of changedetection.io and left it to notify me of the configured changes. It had worked for months, nearly a year. Today I opened it up to add a new site to watch and every single one of my watches fails because it can't resolve the hostnames. Apparently they've been failing for 2 months. No notifications. No easy way to fix this.

I've downloaded the latest docker image and restarted my containers but no change. I've tried changing how the requests are made (Basic fast Plaintext/HTTP Client vs Playwright Chromium/Javascript via 'ws://sockpuppetbrowser:3000'), but it doesn't impact anything, the hostname doesn't resolve. I can go to these sites, they're public and I have no DNS issue on any machine on my network... except this docker image.

I can't find a place to specify DNS. I've tried adding new watches both to old domains and never before seen domains but they get the same error:

Exception: HTTPSConnectionPool(host='<domain>', port=443): Max retries exceeded with url: <the path I want to hit>(Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7e91af59cd50>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution'))

It doesn't come and go. Every request fails every time right now and I cannot figure out why.

My docker-compose.yml:

services:
    changedetection:
      image: ghcr.io/dgtlmoon/changedetection.io
      container_name: changedetection
      hostname: changedetection
      volumes:
        - changedetection-data:/datastore
      environment:
        - PORT=5000
        - PLAYWRIGHT_DRIVER_URL=ws://sockpuppetbrowser:3000
        - BASE_URL=https://changedetection.io
        - HIDE_REFERER=true
      ports:
        - 5000:5000
      restart: unless-stopped
      depends_on:
          playwright-chrome:
              condition: service_started
    sockpuppetbrowser:
        hostname: sockpuppetbrowser
        image: dgtlmoon/sockpuppetbrowser:latest
        cap_add:
            - SYS_ADMIN
        restart: unless-stopped
        environment:
            - SCREEN_WIDTH=1920
            - SCREEN_HEIGHT=1024
            - SCREEN_DEPTH=16
            - MAX_CONCURRENT_CHROME_PROCESSES=1
    browser-chrome:
        hostname: browser-chrome
        image: selenium/standalone-chrome:4
        environment:
            - VNC_NO_PASSWORD=1
            - SCREEN_WIDTH=1920
            - SCREEN_HEIGHT=1080
            - SCREEN_DEPTH=24
        volumes:
            - /dev/shm:/dev/shm
        restart: unless-stopped
    playwright-chrome:
      hostname: playwright-chrome
      image: browserless/chrome
      restart: unless-stopped
volumes:
  changedetection-data:

[dgtlmoon]

paste your full docker-compose.yml

[coreyog]

Updated post with docker-compose.yml with all comments removed for brevity.

[OPerepadia]

I was seeing similar errors every time after reboot. It couldn't resolve host names, even though DNS on my machine was working fine. I was able to solve it by adding DNS servers to the docker configuration in /etc/docker/daemon.json

{
  "dns": ["8.8.8.8", "1.1.1.1"]
}

[coreyog]

This did the trick for me. Still not sure what changed a few months ago but I'm glad to be up and running again! Thank you.