Upstart and resolvconf cache

I’ve recently found this when I was trying to fix a nameserver config issue with resolvconf on Ubuntu. When resolvconf populates /etc/resolv.conf, it will read what we have configured inĀ /etc/resolvconf/resolv.conf.d (head, base, tail, etc) and also any dns-server declared in /etc/network/interfaces. I had a conflict with something I was populating in the head file (with

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