how to use s6

[cfoellmann]

hi @tiredofit

I am trying to move this https://github.com/olbat/dockerfiles/blob/master/cupsd/Dockerfile.stable to your docker.io/tiredofit/debian:bookworm` base.

I thought it to be very straight forward but https://github.com/wus-technik/docker-printserver does not start the cupsd. Can you have a look at my run and structure? Should be an easy fix for you.

this is the cycle of unsuccessful start attempts:

+ set +x
2025-04-30.11:51:06 [DEBUG] /etc/services.available/10-cupsd/run ** [cupsd] [process_restart] - Sleeping for 1 seconds
+ '[' 50 -gt 1 ']'
+ sleep 1
+ '[' true = true ']'
+ '[' '' = false ']'
++ log_prefix
++ output_off
++ '[' true = true ']'
++ set +x
++ basename ./run
+ echo -e '2025-04-30.11:51:07 \e[42m[STARTING]\e[49m /etc/services.available/10-cupsd/run ** [cupsd] [50] Starting cupsd'
2025-04-30.11:51:07 [STARTING] /etc/services.available/10-cupsd/run ** [cupsd] [50] Starting cupsd
++ log_prefix
++ output_off
++ '[' true = true ']'
++ set +x
++ basename ./run
+ echo -e '2025-04-30.11:51:07 [STARTING] /etc/services.available/10-cupsd/run ** [cupsd] [50] Starting cupsd'
+ output_on
+ '[' true = true ']'
+ case "$(basename "$0")" in
++ basename ./run
+ case "$PWD" in
+ set -x
+ exec /usr/sbin/cupsd -f
+ PROCESS_NAME=cupsd
+ check_container_initialized
+ print_debug 'Checking to see if container initialization scripts have completed'
+ output_off
+ '[' true = true ']'
+ set +x
2025-04-30.11:51:08 [DEBUG] /etc/services.available/10-cupsd/run ** [cupsd] Checking to see if container initialization scripts have completed
+ output_off
+ '[' true = true ']'
+ set +x
+ liftoff
+ output_off
+ '[' true = true ']'
+ set +x
+ print_start 'Starting cupsd'
+ output_off
+ '[' true = true ']'
+ set +x
2025-04-30.11:51:08 [ERROR] /etc/services.available/10-cupsd/run ** [cupsd] POTENTIAL RUNWAY DETECTECTED: Disabling 10-cupsd service because it has tried restarting '50' times
++ basename /etc/services.available/10-cupsd
+ s6-svc -d /var/run/s6/legacy-services/10-cupsd

[tiredofit]

Interesting, looking at present state of repository it looks fine to me. Although I can't see for sure if the cupsd process is running.

Also, what happens if you run that exact command (minus exec) while inside the container? That may give some hints..

[cfoellmann]

I did solve it just before I wanted to post THIS:

I have this in top 1282 root 20 0 220 76 56 S 0.0 0.0 0:00.05 s6-supervise 10-cupsd

but while the container starts this is popping up

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
   3791 root      20   0    4852   3920   2708 S   1.0   0.0   0:00.03 bash ./run 10-cupsd

BUT:

I removed the mapping of the cups folders in my docker compose and it starts up. I will have a look at that one now. But for testing and dev this is great!!

Again thanks for the great base and you reply just pushed me into the right thinking :-)