#echo 'export TMOUT=300' >>/etc/profile #echo 'export HISTSIZE=5' >>/etc/profile #echo 'export HISTFILESIZE=5' >>/etc/profile #tail -3 /etc/profile #./etc/profile
2.1.9 加大文件描述符echo '* - nofile 65535 '>>/etc/security/limits.conf tail -1 /etc/security/limits.conf
2.1.10 内核优化
cat >>/etc/sysctl.conf<<EOF ##youhua net.ipv4.tcp_fin_timeout = 2 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_keepalive_time = 600 net.ipv4.ip_local_port_range = 4000 65000 net.ipv4.tcp_max_syn_backlog = 16384 net.ipv4.tcp_max_tw_buckets = 36000 net.ipv4.route.gc_timeout = 100 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_synack_retries = 1 net.core.somaxconn = 16384 net.core.netdev_max_backlog = 16384 net.ipv4.tcp_max_syn_backlog = 16384 ##iptables youhua net.nf_conntrack_max = 25000000 net.netfilter.nf_conntrack_max = 25000000 net.netfilter.nf_conntrack_tcp_timeout_established = 180 net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120 net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60 net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120 EOF
#修改内核后让内核配置文件中的参数生效
sysctl -p
2.1.11 安装一些软件yum install lrzsz namp tree dos2unix nc -y
2.1.12 系统升级操作（暂不使用）#yum update 或 yum upgrade #yum -y update #升级所有包，改变软件设置和系统设置，系统版本内核都升级 #yum -y ipgrade #升级所有包，不改变系统设置和软件设置，系统版本升级，内核不变
2.2 模板机主机hosts文件配置
cat >/etc/hosts<<EOF 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 172.16.1.5 lb01 172.16.1.6 lb02 172.16.1.7 web02 172.16.1.8 web01 172.16.1.9 web03 172.16.1.51 db01 db01.etiantian.org 172.16.1.31 nfs01 172.16.1.41 backup 172.16.1.61 m01 EOF
第3章 虚拟机克隆 3.1 克隆前准备
一清空，两删除
清空网络配置文件
>/etc/udev/rules.d/70-persistent-net.rules
echo '>/etc/udev/rules.d/70-persistent-net.rules' >>/etc/rc.local
删除网卡配置文件中的uuid和HWADDR
sed -ri '/HWADDR|UUID/d' /etc/sysconfig/network-scripts/ifcfg-eth[01]
3.2 进行克隆模板机关机
shutdown -h now
3.2.1 保留快照 3.3 进行克隆 3.3.1 进行克隆
01. 利用给的脚本进行修改
02. 手动进行修改