一、查看CentOS内核版本命令（两种方法）：
1、cat /proc/version
[root@bj-rack001-hadoop001 ~]# cat /proc/versionLinux version 3.10.0-862.el7.x86_64 (builder@kbuilder.) (gcc version 4.8.5 0623 (Red Hat 4.8.5-28) (GCC) ) #1 SMP Fri Apr 20 16:44:24 UTC
2、uname -a
[root@bj-rack001-hadoop001 ~]# uname -aLinux bj-rack001-hadoop001 3.10.0-862.el7.x86_64 #1 SMP Fri Apr 20 16:44:24 UTC x86_64 x86_64 x86_64 GNU/Linux
二、查看CentOS系统版本的命令（2种方法）：
1、lsb_release -a，即可列出所有版本信息：
[root@bj-rack001-hadoop001 ~]# 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 7.5.1804 (Core) Release:7.5.1804Codename:Core
2、cat /etc/redhat-release，这种方法只适合Redhat系的Linux：
[root@bj-rack001-hadoop001 ~]# cat /etc/redhat-releaseCentOS Linux release 7.5.1804 (Core)
