yum -y install wget vim net-tools zip unzip lsof lrzsz lsof bridge-utils tree \
gcc gcc-c++ automake pcre pcre-devel zlib zlib-devel \
ntpdate telnet openssl openssl-devel tcpdump iotop traceroute systemd-devel \
bash-completion glibc glibc-devel bc libevent libevent-devel