问题：lsb_release 是查看系统版本信息的工具
[root@localhost ~]# lsb_release -a
-bash: lsb_release: command not found
解决方法：yum install redhat-lsb -y
[root@compass-user-hd-node6]:~# lsb_release -a
LSB Version: :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID: CentOS
Description: CentOS Linux release 7.3. (Core)
Release: 7.3.
Codename: Core