01 Linux系统配置初始化
#/bin/bash export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin # 更改主机名 # hostnamectl set-hostname <hostname> # 隐藏服务器版本 > /etc/issue # 修改字符集 localectl set-locale LANG=en_US.UTF-8 # 解决ssh连接速度慢的问题 sed -i '/GSSAPIAuthentication/{s/yes/no/}' /etc/ssh/sshd_config sed -i 's/\#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config # sed -i '134i GSSAPIAuthentication no\nUseDNS no' /etc/ssh/sshd_config # 更新yum源 if egrep "7.[0-9]" /etc/redhat-release &>/dev/null; then wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo elif egrep "6.[0-9]" /etc/redhat-release &>/dev/null; then wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-6.repo wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo fi yum clean all # 设置时区并同步时间 ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime if ! crontab -l | grep "ntpdate" &>/dev/null; then (echo "*/5 * * * * /usr/sbin/ntpdate ntp.aliyun.com >/dev/null 2>&1"; crontab -l) | crontab fi # 禁用selinux sed -i '/SELINUX/{s/enforcing/disabled/}' /etc/selinux/config # 关闭防火墙 if egrep "7.[0-9]" /etc/redhat-release &>/dev/null; then systemctl stop firewalld.service systemctl disable firewalld.service elif egrep "6.[0-9]" /etc/redhat-release &>/dev/null; then service iptables stop chkconfig iptables off fi # 关闭postfix服务 if egrep "7.[0-9]" /etc/redhat-release &>/dev/null; then systemctl stop postfix.service systemctl disable postfix.service elif egrep "6.[0-9]" /etc/redhat-release &>/dev/null; then service postfix stop chkconfig postfix off fi # 历史命令显示操作时间;命令行历史数;忽略所有以空格开头的命令。 if ! grep "HISTTIMEFORMAT" /etc/profile &>/dev/null; then echo 'export HISTTIMEFORMAT="%F %T `whoami` "' >> /etc/profile echo "export HISTSIZE=50" >>/etc/profile echo "export HISTFILESIZE=50" >> /etc/profile echo "export HISTCONTROL=ignorespace" >>/etc/profile fi # SSH超时时间,改变umask if ! grep "TMOUT=3600" /etc/profile &>/dev/null; then echo "export TMOUT=3600" >> /etc/profile echo "umask 022" >> /etc/profile fi # 禁止root远程登录 # sed -i 's/\#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config # 禁止定时任务向发送邮件 sed -i 's/^MAILTO=root/MAILTO=""/' /etc/crontab # 设置最大打开文件数 if ! grep "* soft nofile 65535" /etc/security/limits.conf &>/dev/null; then cat >> /etc/security/limits.conf << EOF * soft nofile 65535 * hard nofile 65535 EOF fi # 系统内核优化 if ! grep "net.ipv4" /etc/sysctl.conf &>/dev/null; then cat >> /etc/sysctl.conf << EOF net.ipv4.tcp_tw_reuse = 1 net.ipv4.ip_local_port_range = 1024 65000 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_max_tw_buckets = 20480 net.ipv4.tcp_max_syn_backlog = 20480 net.core.netdev_max_backlog = 262144 net.ipv4.tcp_fin_timeout = 20 EOF fi # 减少SWAP使用 if ! grep "vm.swappiness" /etc/sysctl.conf &>/dev/null; then cat >> /etc/sysctl.conf << EOF vm.swappiness = 0 EOF fi # echo "0" > /proc/sys/vm/swappiness # 临时生效 # 安装系统性能分析工具及其他 yum install gcc make autoconf vim sysstat net-tools iostat iftop iotop lrzsz -y # 重启服务器 reboot