安装MongoDB # 官网下载，解压，放到： /usr/local #环境变量 vim ~/.bash_profile #添加 PATH=/usr/local/mongodb/bin:${PATH} export PATH # 使生效 source vim ~/.bash_profile mongod -version db version v4.2.3 git version: 6874650b362138df74be53d366bbefc321ea32d4 allocator: syste