nginx 下同时使用 redis 和 varnish 需要注意什么问题？

Question

请教各位大神，nginx＋php下，在已经使用varnish的基础上，再加个redis的话，是否有必要这样做么？加了redis的话，会带来什么好处？

谢谢！

Answer 1

Varnish or nginx caches complete pages, while redis caches raw data taken from the database, which is finally processed and synthesized by the program and fed to varnish or nginx. They are both caches, but the meaning is different.