Is watchtower scanning any containers ?

[coderunway]

I think Watchtower is not scanning containers. Can anyone tell me what am I doing wrong here..

I have 5 containers running. I'm running watchtower also as a container on my Synology NAS. I configured the watchtower with the below docker-compose file and used the command **sudo docker-compose up -d** to bring up watchtower container.

version: '3'
services:
   watchtower:
      container_name: watchtower
      restart: always
      image: containrrr/watchtower
      environment:
      - TZ=Asia/Kolkata
      volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      command: --debug true --interval 86400

However, when I check the watchtower logs every day, I see the line as below, which states "0 scanned".

"time="2021-07-30T01:28:20+05:30" level=debug msg="Session done: 0 scanned, 0 updated, 0 failed"

Here is the log

time="2021-07-29T01:28:17+05:30" level=debug msg="Making sure everything is sane before starting",
time="2021-07-29T01:28:17+05:30" level=debug msg="Retrieving running containers",
time="2021-07-29T01:28:20+05:30" level=debug msg="There are no additional watchtower containers",
time="2021-07-29T01:28:20+05:30" level=debug msg="Watchtower HTTP API skipped.",
time="2021-07-29T01:28:20+05:30" level=info msg="Watchtower 1.3.0\nUsing no notifications\nOnly checking containers with name \"true\"\nScheduling first run: 2021-07-30 01:28:20 +0530 IST\nNote that the first check will be performed in 23 hours, 59 minutes, 59 seconds",
time="2021-07-30T01:28:20+05:30" level=debug msg="Checking containers for updated images",
time="2021-07-30T01:28:20+05:30" level=debug msg="Session done: 0 scanned, 0 updated, 0 failed",
time="2021-07-30T01:28:20+05:30" level=debug msg="Retrieving running containers",
time="2021-07-30T01:28:20+05:30" level=debug msg="Scheduled next run: 2021-07-31 01:28:20 +0530 IST"

[piksel]

That is why we added the startup message 😁

Only checking containers with name "true"

--debug does not take an argument, so --debug true becomes "enable debug and only check containers with the name true"

[coderunway]

Ah ha... Thanks you so much.. That was really stupid of me to not notice that :) Now I see it scanning all.. 👍

[piksel]

Well, not really, as it's a common mistake 😁.
It's a quirk of the argument parser, since flags normally just set something to true (like --debug) you have to explicitly add an = to specify the value (--debug=false). It's a bit confusing, but better than the alternative 🤷‍♀️