Linux – stop a Gentoo “emerge world” to add a feature or use flag I forgot

You can use use apt-cacher-ng easily.

Remap-gentoo: file:gentoo_mirrors http://distfiles.gentoo.org/ /gentoo ; file:backends_gentoo # Gentoo Archives

• In the file gentoo_mirrors, put all of the mirrors you want to capture.
• In the file backends_gentoo, put the backup mirror you want to use for fetching.

Here's a script to create gentoo_mirrors

# This fetches the live Gentoo mirrors list
# robbat2@gentoo.org - 2013/Dec/03
OUTFILE=gentoo_mirrors
URL=http://www.gentoo.org/main/en/mirrors3.xml
wget --save-headers -q $URL -O - \
| sed -n \
-e '/^[A-Z]/{s,^,#,g;p}' \
-e '/<mirrorgroup/{s,^,\n#,g;p}' \
-e '/<name/{s,^,#,g;p}' \
-e '/<uri/{/protocol="http"/{s/.*<uri[^>]\+>//g;s/<\/uri>//g;p}}' \
>$OUTFILE

Source: I'm a senior Gentoo developer, and run the Gentoo infrastructure. I have submitted a variant on the above to the upstream apt-cacher-ng author.

You're on the right path that monit fails to start it because the PID file still exists.

I have ran into these problems before and the solution I used was to create an init script for the particular service, using something like /etc/init.d/skeleton (that's on debian) as a template (or rc.local), making sure a PID file is being created and deleted as appropriate (using start-stop-daemon et al).

I don't think there's really another solution as monit doesn't deal with deleting or creating PID files. Whichever script you use to start and stop the service, it needs to properly create and delete the PID files.