1.输入man proc,报错:No manual entry for proc
切换到root用户下,执行:yum install -y man-pages
2.输入netstat -anlp|grep 21050,报错:-bash: netstat: command not found
切换到root用户下,执行:yum install -y net-tools
3.sar命令找不到,command not found
切换到root用户下,执行:yum install -y sysstat
4.输入nslookup命令,command not found
切换root用户下,
查找是bind-utils包,于是:
yum install -y bind-utils