hi guys, we build boost every time when building ceph. i don't think it's efficient, hence http://tracker.ceph.com/issues/25186 is filed to track this issue. to cache the built libboost for xenial and bionic, we can setup a PPA repo or host the repo by ourselves. if this approach works fine, we can also build libboost for centos. and expand the coverage to other dependencies, like dpdk, rocksdb and seastar. what do you think? -- Regards Kefu Chai
