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Grafana PNG export on headless Debian server (phantomjs / render fails with "404 page not found")

If it still fails after you've set "root_url" to the correct value in grafana.ini, you might want to check whether you can run phantomjs from the command line.

If you get "QXcbConnection: Could not connect to display / PhantomJS has crashed", then the explanation is here: Debian Bug #817277.

To fix it, I installed xvfb (apt-get install xvfb), and edited /usr/bin/phantomjs so that the last line now looks like this:
exec "/usr/bin/xvfb-run" --server-args="-screen 0 640x480x16" "/usr/lib/phantomjs/phantomjs" "$@"

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