On 12/28/21 12:32 AM, roee klinger wrote: > I am running Squid inside a Docker container, and I am using an external > helper, I am trying to get the logs from the external helper to go to > Docker logs (stdout). > > Currently, I am writing the logs to a file, which works, but I would > like to get them to stdout instead, however, Squid redirects all the > stdout from the external helper to itself, which makes me unable to send > the logs I want to stdout. > > Is there a way for me to send the logs I want to the main stdout of the > container and not to Squid itself? > sys.stderr.write("test ################################################") According to [0], Python line-buffers stderr output. Try adding a new line to the message. [0] https://adamj.eu/tech/2020/06/26/how-to-check-if-pythons-output-buffering-is-enabled/ ---- The rest probably does not apply to your docker, but I will record it here in case somebody else finds it useful... > cache_log stdio:/dev/stdout The above trick does not work in many environments. In basic command-line tests, I get[1,2]: > squid.strace.2072945:openat(AT_FDCWD, "/dev/stdout", > O_RDWR|O_CREAT|O_APPEND, 0666) = -1 EACCES (Permission denied) > WARNING: Cannot write log file: stdio:/dev/stdout > stdio:/dev/stdout: Permission denied > messages will be sent to 'stderr'. After that, the helper stderr output will not show up on Squid _stdout_: Since Squid processes are using stderr instead of stdout for cache_log, the helper stderr output is being sent to the (duped) Squid stderr file descriptor rather than a (duped) Squid stdout descriptor. There are other subtle problems with that /dev/stdout trick. It is essentially unsupported. HTH, Alex. [1] Same problem without the "stdio:" prefix. The presence of that prefix in the WARNING message is misleading: Even with that prefix, Squid actually tries to open "/dev/stdout", of course. [2] Squid cannot open /dev/stdout in many environments because that pipe often belongs to the user starting Squid rather than the user Squid runs as: https://unix.stackexchange.com/questions/38538/bash-dev-stderr-permission-denied/38580 _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users