修改主机名
# vim /etc/hostname
更新内核
yum -y update
修改yum源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo # 清理旧缓存 yum clean all # 创建新缓存 yum makecache
安装一些基础软件
yum -y install ntpdate yum-utils cmake ncurses-devel libaio-devel make gcc gcc-c++ lrzsz dos2unix tree bash-completion vim net-tools telnet wget curl lsof -y && ntpdate -u cn.pool.ntp.org
History历史记录配置
sed -i s#HISTSIZE=1000#HISTSIZE=10000#g /etc/profile echo ‘export HISTTIMEFORMAT="%F %T `whoami` "‘ >> /etc/profile
关闭网卡图形化设置模式
systemctl stop NetworkManager.service systemctl disable NetworkManager.service
关闭selinux
sed -i ‘s/SELINUX=enforcing/SELINUX=disabled/‘ /etc/selinux/config setenforce 0
关闭防火墙
systemctl stop firewalld.service systemctl disable firewalld.service
关闭swap
swapoff -a && sed -i ‘/ swap / s/^\(.*\)$/#\1/g‘ /etc/fstab
服务器时间同步
\cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime yum -y install ntpdate /usr/sbin/ntpdate ntp1.aliyun.com
修改最大进程数和最大文件打开数
cat >> /etc/security/limits.conf << EOF \* soft nofile 1024000 \* hard nofile 1024000 \* soft nproc 1024000 \* hard nproc 1024000 EOF
说明：
- ‘*‘ 代表针对所有用户
- noproc 是代表最大进程数
- nofile 是代表最大文件打开数
ssh优化
#更改端口 sed -i ‘s/#Port 22/Port 59422/‘ /etc/ssh/sshd_config # 禁止root远程登录 sed -i ‘[email protected]#PermitRootLogin [email protected] [email protected]‘ /etc/ssh/sshd_config # 禁止空密码登录 sed -i ‘[email protected]#PermitEmptyPasswords [email protected] [email protected]‘ /etc/ssh/sshd_config # 关闭SSH反向查询，以加快SSH的访问速度 sed -i ‘[email protected]#UseDNS [email protected] [email protected]‘ /etc/ssh/sshd_config /etc/ssh/sshd_config sed -i ‘[email protected] [email protected] [email protected]‘ /etc/ssh/sshd_config /etc/ssh/sshd_config # 重启ssh systemctl restart sshd.service
终端超时
# 300秒内，没有任何输入，则自动退出 echo "export TMOUT=300" >> /etc/profile source /etc/profile
内核参数优化
方式一
内核参数配置文件
[[email protected]16 ~]# vim /etc/sysctl.conf #关闭ipv6 net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 #避免放大攻击 net.ipv4.icmp_echo_ignore_broadcasts = 1 #开启恶意icmp错误消息保护 net.ipv4.icmp_ignore_bogus_error_responses = 1 #关闭路由转发 net.ipv4.ip_forward = 0 开起路由转发将0改为1即可 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.default.send_redirects = 0 #开启反向路径过滤 net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.rp_filter = 1 #处理无源路由的包 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.default.accept_source_route = 0 #关闭sysrq功能 kernel.sysrq = 0 #core文件名中添加pid作为扩展名 kernel.core_uses_pid = 1 #开启SYN洪水攻击保护 net.ipv4.tcp_syncookies = 1 表示开启SYN Cookies。当出现SYN等待队列溢出时，启用cookies来处理，可防范少量SYN攻击，默认为1，表示开启的； 表示SYN队列的长度，默认为1024，加大队列长度为8192，可以容纳更多等待连接的网络连接数 net.ipv4.tcp_max_syn_backlog = 262144 #修改消息队列长度 kernel.msgmnb = 65536 kernel.msgmax = 65536 #设置最大内存共享段大小bytes kernel.shmmax = 68719476736 kernel.shmall = 4294967296 #timewait的数量，默认180000 net.ipv4.tcp_max_tw_buckets = 6000 net.ipv4.tcp_sack = 1 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_rmem = 4096 87380 4194304 TCP读buffer，可参考的优化值: 32768 436600 873200 net.ipv4.tcp_wmem = 4096 16384 4194304 tcp写buffer，可参考的优化值: 8192 436600 873200 net.core.wmem_default = 8388608 TCP写buffer的默认值 net.core.rmem_default = 8388608 TCP读buffer的默认值 net.core.rmem_max = 16777216 TCP写buffer的最大值 net.core.wmem_max = 16777216 TCP写buffer的最大值 #每个网络接口接收数据包的速率比内核处理这些包的速率快时，允许送到队列的数据包的最大数目 net.core.netdev_max_backlog = 262144 #限制仅仅是为了防止简单的DoS 攻击 net.ipv4.tcp_max_orphans = 3276800 #未收到客户端确认信息的连接请求的最大值 net.ipv4.tcp_max_syn_backlog = 262144 net.ipv4.tcp_timestamps = 0 #内核放弃建立连接之前发送SYNACK 包的数量 net.ipv4.tcp_synack_retries = 1 #内核放弃建立连接之前发送SYN 包的数量 net.ipv4.tcp_syn_retries = 1 #启用timewait 快速回收 net.ipv4.tcp_tw_recycle = 1 #开启重用。允许将TIME-WAIT sockets 重新用于新的TCP 连接 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_mem = 94500000 915000000 927000000 net.ipv4.tcp_fin_timeout = 1 #当keepalive 起用的时候，TCP 发送keepalive 消息的频度。缺省是2 小时 net.ipv4.tcp_keepalive_time = 30 #允许系统打开的端口范围 net.ipv4.ip_local_port_range = 1024 65000 #修改防火墙表大小，默认65536 #net.netfilter.nf_conntrack_max=655350 #net.netfilter.nf_conntrack_tcp_timeout_established=1200 #确保无人能修改路由表 net.ipv4.conf.all.accept_redirects = 0 net.ipv4.conf.default.accept_redirects = 0 net.ipv4.conf.all.secure_redirects = 0 net.ipv4.conf.default.secure_redirects = 0 [[email protected]-16 ~]# sysctl -p 保存生效
方式二
cat >> /etc/sysctl.conf<<EOF net.ipv4.ip_forward=1 net.bridge.bridge-nf-call-iptables=1 net.bridge.bridge-nf-call-ip6tables=1 vm.swappiness=0 vm.max_map_count=655360 EOF
原文地址：https://www.cnblogs.com/wt-mack/p/11951843.html
时间： 2024-11-06 15:27:58