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#3.配置服务器ip名称解析
\cp /etc/hosts{,.bak}
cat >/etc/hosts<<EOF
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain
EOF
#4.更改yum源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo
#5.关闭selinux
sed -i.bak 's/SELINUX-enforcing/SELINUX-disabled/' /etc/selinux/config
grep SELINUX-disabled /etc/selinux/config
setenforce 0
getenforce
#6.关闭 iptables
/etc/init.d/iptables stop
/etc/init.d/iptables stop
chkconfig iptables off
#7.精简开机自启动服务
export LANG-en
chkconfig|egrep -v "crond|sshd|network|rsyslog|sysstat"|awk '{print "chkconfig",$1,"off"}'|bash
chkconfig --list|grep 3:on
#8.提升oldboy可以sudo
useradd oldboy
echo 123456|passwd --stdin oldboy
\cp /etc/sudoers /etc/sudoers.ori
echo "oldboy ALL=(ALL) NOPASSWD:ALL " >> /etc/sudoers
tail -l /etc/sudoers
visudo -c
#9. 英文字符集
cp /etc/sysconfig/i18n /etc/sysconfig/i18n.ori
echo 'LANG="en_US.UTF-8"' >/etc/sysconfig/i18n
source /etc/sysconfig/i18n
echo $LANG
#10.时间同步
echo '#time sync by jpw at 2018-08-14' >> /var/spool/cron/root
echo '*/5 * * * * /usr/sbin/ntpdate pool.ntp.org >/dev/null 2>&1' >> /var/spool/cron/root
crontab -l
#11.命令行安全(可不设置)
#echo 'export TMOUT=300' >>/etc/profile
#echo 'export HISTSIZE=5' >>/etc/profile
#echo 'export HISTFILESIZE=5' >>/etc/profile
#tail -3 /etc/profile
#. /etc/profile
#12.大文件描述
echo '* - nofile 65535' >> /etc/security/limits.conf
tail -1 /etc/security/limits.conf
#13.内核优化
cat >> /etc/sysctl.conf<<EOF
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_prot_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_orphans = 16384
#以下参数参数是对防火墙的优化,防火墙不开会提示 ,可以忽略不理
#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
sysctl -p
#14.常用小软件
yum install lrzsz nmap tree dos2unix nc telnet sl -y
#15.ssh连接速度慢优化
sed -i.bak 's@#UseDNS yes@UseDNS no@g;s@^GSSAPIAuthentication yes@GSSAPIAuthentication no@g' /etc/ssh/sshd_config
/etc/init.d/sshd reload