I just upgraded on FC9, 2.6.26.6-79.fc9.i686 to squid-3.0.STABLE10-1.fc9.i386 this very morning (can't remember what version it was from - just whatever went before I suppose). Once I'd done this, Squid refused to start, throwing up with a: FATAL: Cannot open 'on' for writing. The parent directory must be writeable by the user 'squid', which is the cache_effective_user set in squid.conf. I found various references to this but no solutions apart from one person who said the issue was resolved after deleting and re-creating the cache and then upgrading to the latest version. I was already current and re-creating the cache did nothing. After an hour of staff and students realising how truly dull computers are without the Internet, I sussed it out. A grep -v '^#' /etc/squid/squid.conf | egrep 'on' showed the lines in squid.conf which weren't commented out and also had 'on' in them. This got me to try commenting these options out. After some monkeying around I found that I needed to chop both of these out to make the current Squid talk to me again: referer_log on useragent_log on I also have 'emulate_httpd_log on' set but I didn't need to remove that though it may be relevant. Anyhow, I'm sure a few people will run into this so hopefully it'll help someone. C.
