Apache /docker.stdout busy or permission errors

[mblaschke]

There are at least 2 reports from problems with /docker.stdout due to permission errors:

app_1         | [Mon Jan 09 09:02:18.518789 2017] [log_config:error] [pid 1984:tid 140401578567552] (13)Permission denied: AH00649: could not open transfer log file /docker.stdout.
app_1         | AH00015: Unable to open logs

also see laradock/laradock#505

[mblaschke]

✅ Ubuntu 16.04 with btrfs
✅ Dinghy with aufs

[mblaschke]

Switched from file to pipe in syslog, maybe the problem is fixed now. We still can't reproduce the isssue

[julrich]

That might help with a warning we're seeing on some instances, a lot, too:
[SYSLOG] syslog-ng[20]: WARNING: you are using the file driver, underlying file is a FIFO, it should be used by pipe(); filename='/docker.stdout'

[julrich]

I see, that's exactly what's in the Changelog, too :)
c86b5d5#diff-4ac32a78649ca5bdd8e0ba38b7006a1eR8