解决内网环境无法安装包（rpm包确少依赖）

rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY

解决办法在rpm 语句后面加上 --force --nodeps就可以了

rpm -ivh zlib-devel-1.2.7-19.el7.x86_64.rpm --force --nodeps

打一些基础的命令包

yum  install  -y  --downloadonly  --downloaddir=/opt tree nmap sysstat lrzsz  telnet bash-completion bash-completion-extras vim  lsh-completion-extras vim  lsof  net-tools rsync ntpdate nfs-utils zlib zlib-devel openssl-devel gcc gcc-c++ autoconf pcre pcre-devel make automake wget httpd-tools  tree