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  -aLSB 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-noarchDistributor ID:    CentOSDescription:    CentOS Linux release 7.3.1611 (Core) Release:    7.3.1611Codename:    Core