喜欢被宠着你
优化内容：
（1.设置history历史记录
（2.添加普通用户，设置sudo权限
（3.禁止root远程用户登录
（4.修改远程端口
（5.精简开机启动服务器
（6.关闭selinux
（7.配置iptables
（8.修改最大连接数 ulimit
（9.禁止使用Ctrl+Alt+Del快捷键重启服务器
（10.修改默认DNS
（11.安装必要软件,更新yum源 [epel源]
（12.更新内核和软件到最新版本
（13.优化内核参数 [根据实际情况调整]
（14.去除上次登录的信息
（15.关闭开机显示内核信息
1.设置history历史记录
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.添加普通用户，设置sudo权限
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远程用户登录
sed -i 's/#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config
4.修改远程端口
sed -i 's/#Port 22/Port 9527/' /etc/ssh/sshd_config /etc/init.d/sshd restart
5.精简开机启动服务器
for server in `chkconfig --list|egrep -v 'crond|network|rsyslog|sshd|iptables'|awk '{print $1}'`;do chkconfig $server off; done6.关闭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 #允许某个IP段远程访问ssh iptables -A INPUT -p tcp -m tcp --dport 9527 -s 192.168.64.0/24 -j ACCEPT #开启80端口 iptables -A INPUT -P tcp -m tcp --dropt 80 -j ACCEPT #允许某个IP的所有请求 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.修改最大连接数 ulimit
#方法有很多,未必就这一种 echo '* - noproc 65535' >> /etc/security/limits.conf echo '* - nofile 65535' >> /etc/security/limits.conf
9.禁止使用Ctrl+Alt+Del快捷键重启服务器
sed -i "s/start on control-alt-delete/#start on control-alt-delete/g" /etc/init/control-alt-delete.conf
10.修改默认DNS
echo "nameserver 8.8.8.8" > /etc/resolv.conf echo "nameserver 8.8.4.4" >> /etc/resolv.conf
11.安装必要软件,更新yum源 [epel源]
#根据个人公司情况,这里只列举了自己常用的软件和yum源,根据实际情况更改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.更新内核和软件到最新版本
yum -y upgrade
13.优化内核参数 [根据实际情况调整]
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 防火墙 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.去除上次登录的信息
touch ~/.hushlogin
