CentOS 6.5系統基礎最佳化附帶最佳化指令碼

luashin發表於2016-03-31
最佳化內容:
(1.設定history歷史記錄
(2.新增普通使用者,設定sudo許可權
(3.禁止root遠端使用者登入
(4.修改遠端埠
(5.精簡開機啟動伺服器
(6.關閉selinux
(7.配置iptables
(8.修改最大連線數 ulimit
(9.禁止使用Ctrl+Alt+Del快捷鍵重啟伺服器
(10.修改預設DNS
(11.安裝必要軟體,更新yum源 [epel源] 
(12.更新核心和軟體到最新版本
(13.最佳化核心引數 [根據實際情況調整]
(14.去除上次登入的資訊
(15.關閉開機顯示核心資訊
 
1.設定history歷史記錄
echo '
export HISTFILE=$HOME/.bash_history
export HISTSIZE=2000
export HISTFILESIZE=2000
export HISTTIMEFORMAT="%F %T `whoami` "
export PROMPT_COMMAND="history -a; history -c; history -r;"
shopt -s histappend
typeset -r PROMPT_COMMAND
typeset -r HISTTIMEFORMAT ' > /etc/profile.d/history.sh
source /etc/profile

2.新增普通使用者,設定sudo許可權
username='dyt'
password='dyt2015'
useradd $username ; echo $password | passwd --stdin $username
sed -i "98 a$username    ALL=(ALL)       NOPASSWD: ALL" /etc/sudoers

3.禁止root遠端使用者登入
sed -i 's/#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config

4.修改遠端埠
sed -i 's/#Port 22/Port 9527/' /etc/ssh/sshd_config
/etc/init.d/sshd restart

5.精簡開機啟動伺服器
for server in `chkconfig --list|egrep -v 'crond|network|rsyslog|sshd|iptables'|awk '{print $1}'`;do chkconfig $server off; done

6.關閉selinux
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
setenforce 0

7.配置iptables
/etc/init.d/iptables restart
iptables -F
iptables -X
iptables -Z
iptables -A INPUT -p icmp -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT

#允許某個IP段遠端訪問ssh
iptables -A INPUT -p tcp -m tcp --dport 9527 -s 192.168.64.0/24 -j ACCEPT

#開啟80埠
iptables -A INPUT -P tcp -m tcp --dropt 80 -j ACCEPT

#允許某個IP的所有請求
iptables -A INPUT -p all -s 124.43.56.90/30 -j ACCEPT
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DROP
/etc/init.d/iptables save
/etc/init.d/iptables restart

8.修改最大連線數 ulimit
#方法有很多,未必就這一種
echo '*  -  noproc  65535' >> /etc/security/limits.conf
echo '*  -  nofile  65535' >> /etc/security/limits.conf

9.禁止使用Ctrl+Alt+Del快捷鍵重啟伺服器
sed -i "s/start on control-alt-delete/#start on control-alt-delete/g" /etc/init/control-alt-delete.conf

10.修改預設DNS
echo "nameserver 8.8.8.8" > /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf

11.安裝必要軟體,更新yum源 [epel源] 
#根據個人公司情況,這裡只列舉了自己常用的軟體和yum源,根據實際情況更改yum源
yum -y install gcc gcc-c++ openssl-devel openssh-clients wget make lrzsz unzip zip xz ntpdate lsof telnet epel-release vim tree kernel-devel kernel

12.更新核心和軟體到最新版本
yum -y upgrade

13.最佳化核心引數 [根據實際情況調整]
echo -e "net.core.somaxconn = 262144" >> /etc/sysctl.conf
echo -e "net.core.netdev_max_backlog = 262144" >> /etc/sysctl.conf
echo -e "net.core.wmem_default = 8388608" >> /etc/sysctl.conf
echo -e "net.core.rmem_default = 8388608" >> /etc/sysctl.conf
echo -e "net.core.rmem_max = 16777216" >> /etc/sysctl.conf
echo -e "net.core.wmem_max = 16777216" >> /etc/sysctl.conf
echo -e "net.ipv4.route.gc_timeout = 20" >> /etc/sysctl.conf
echo -e "net.ipv4.ip_local_port_range = 1024 65535" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_retries2 = 5" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_fin_timeout = 30" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_syn_retries = 1" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_synack_retries = 1" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_timestamps = 0" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_tw_recycle = 1" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_tw_reuse = 1" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_keepalive_time = 120" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_keepalive_probes = 3" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_keepalive_intvl = 15" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_max_tw_buckets = 36000" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_max_orphans = 3276800" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_max_syn_backlog = 262144" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_wmem = 8192 131072 16777216" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_rmem = 32768 131072 16777216" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_mem = 94500000 915000000 927000000" >> /etc/sysctl.conf
echo -e "net.ipv4.tcp_slow_start_after_idle = 0" >> /etc/sysctl.conf
echo -e "vm.swappiness = 0" >> /etc/sysctl.conf
echo -e "kernel.panic = 5" >> /etc/sysctl.conf
echo -e "kernel.panic_on_oops = 1" >> /etc/sysctl.conf  
echo -e "kernel.core_pipe_limit = 0" >> /etc/sysctl.conf

#iptables 防火牆
echo -e "net.nf_conntrack_max = 25000000" >> /etc/sysctl.conf
echo -e "net.netfilter.nf_conntrack_max = 25000000" >> /etc/sysctl.conf
echo -e "net.netfilter.nf_conntrack_tcp_timeout_established = 180" >> /etc/sysctl.conf
echo -e "net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120" >> /etc/sysctl.conf
echo -e "net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60" >> /etc/sysctl.conf
echo -e "net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120" >> /etc/sysctl.confo

15.去除上次登入的資訊
touch ~/.hushlogin

來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/9034054/viewspace-2073312/,如需轉載,請註明出處,否則將追究法律責任。

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