確認mongodb版本

hduser@master$ mongod --version
db version v3.4.7
git version: cf38c1b8a0a8dca4a11737581beafef4fe120bcd
OpenSSL version: OpenSSL 1.0.1f 6 Jan 2014
allocator: tcmalloc
modules: none
build environment:
    distmod: ubuntu1404
    distarch: x86_64
    target_arch: x86_64