Demo repo for a permission issue with PHP-FPM in Docker where a process is unable to write to /dev/stdout. Start with docker-compose up.
app_1 | The script PID is 56
app_1 | It is run by www-data
app_1 | dr-x------ 2 www-data www-data 0 Jan 11 16:54 .
app_1 | dr-xr-xr-x 9 www-data www-data 0 Jan 11 16:54 ..
app_1 | lr-x------ 1 www-data www-data 64 Jan 11 16:54 0 -> /dev/null
app_1 | l-wx------ 1 www-data www-data 64 Jan 11 16:54 1 -> pipe:[285021]
app_1 | l-wx------ 1 www-data www-data 64 Jan 11 16:54 2 -> pipe:[285021]
app_1 | lr-x------ 1 www-data www-data 64 Jan 11 16:54 255 -> /usr/local/bin/script.sh
app_1 | /usr/local/bin/script.sh: line 6: /proc/56/fd/1: Permission denied
app_1 | /usr/local/bin/script.sh: line 7: /proc/56/fd/2: Permission denied
app_1 | /usr/local/bin/script.sh: line 8: /proc/self/fd/1: Permission denied
app_1 | /usr/local/bin/script.sh: line 9: /proc/self/fd/2: Permission denied