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Why not replace the config file before installing the update? If it loads on restart, it won't use the "wrong" config file till after the update restarts it . . .


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In some website, if you switch from HTTP to HTTPS version, you should inform the the website configuration like 'Hey, we are served through HTTPS now'. Well, the reason is some website has hard-coded configuration to their static file URL generator. So, even they are served through HTTPS, the static-resources-URL generator still thinks that we are talking ...


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You need to look at implementing Grace mode and/or Saint mode. https://www.varnish-cache.org/docs/trunk/users-guide/vcl-saint-and-grace.html Grace mode allows you to serve stale content when your backends are down or slow, and saint mode lets you retry another backend if the backend you used responds with an error. So you'd need 2 or more backends to use ...


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All other answers are pre-2010, hence adding an updated comparison. Nginx A full web server, other features can also be used. Eg: HTTP Compression SSL Support Very light weight as Nginx was designed to be light from the start. Near Varnish caching performance Close to HAProxy load balancing performance Varnish best for complex caching scenarios and ...



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