一、在安裝的時候配置網卡名稱的參數
1. 選擇“Install Centos 7”
2. 按Tab，打開kernel啟動選項后，增加 net.ifnames=0 biosdevname=0
二、最小化安裝完成之后必備安裝軟件
# 添加epel源，安裝基礎軟件，設置主機名
rpm -ivh http://mirrors.aliyun.com/epel/epel-release-latest-7.noarch.rpm
yum install -y net-tools vim lrzsz tree screen lsof tcp wget tcpdump nc mtr nmap openssl-devel ntpdate
hostnamectl set-hostname linux-node1.example.com
# 關閉firewalld和NetworkManager
systemctl stop firewalld
systemctl stop NetworkManager
systemctl disable firewalld
systemctl disable NetworkManager
# 關閉selinux
setenforce 0
sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config
# 設置打開文件描述符的數量
echo "* hard nofile 65536" >> /etc/security/limits.conf
echo "* soft nofile 65536" >> /etc/security/limits.conf
# 設置記錄歷史命令的格式
echo 'export HISTTIMEFORMAT=" %F %T `whoami` "' >> /etc/profile
source /etc/profile
# 使用tables鍵的時候補全systemctl命令
yum install -y bash-completion
# 安裝killall命令
yum install -y psmisc
# 時間同步，如果沒有內網時間同步可以使用公網的
crontab -e
*/5 * * * * /usr/sbin/ntpdate time1.aliyun.com
三、內核參數優化
cat /etc/sysctl.conf
# 系統優化參數
# 關閉ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
# 避免放大攻擊
net.ipv4.icmp_echo_ignore_broadcasts = 1
# 開啟惡意icmp錯誤消息保護
net.ipv4.icmp_ignore_bogus_error_responses = 1
# 關閉路由轉發
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
# 開啟反向路徑過濾
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
# 處理無源路由的包
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
#關閉sysrq功能
kernel.sysrq = 0
# core文件名中添加pid作為擴展名
kernel.core_uses_pid = 1
# 開啟SYN洪水攻擊保護
net.ipv4.tcp_syncookies = 1
# 修改消息隊列長度
kernel.msgmnb = 65536
kernel.msgmax = 65536
# 設置最大內存共享段大小bytes
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
# timewait的數量，默認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
net.ipv4.tcp_wmem = 4096 16384 4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
# 每個網絡接口接收數據包的速率比內核處理這些包的速率快時，允許送到隊列的數據包的最大數目
net.core.netdev_max_backlog = 262144
# 限制僅僅是為了防止簡單的DoS 攻擊
net.ipv4.tcp_max_orphans = 3276800
# 未收到客戶端確認信息的連接請求的最大值
net.ipv4.tcp_max_syn_backlog = 262144
# 啟用timewait 快速回收，需要先打開時間戳。注：（NAT的網絡和負載均衡器上不能打開）
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tw_recycle = 1
#開啟重用。允許將TIME-WAIT sockets 重新用於新的TCP連接
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
# 當keepalive 起用的時候，TCP 發送keepalive 消息的頻度。缺省是2小時
net.ipv4.tcp_keepalive_time = 30
#允許系統打開的端口范圍，不建議從1024開始，因為某些端口會存在10000以內。一般情況下已夠用。
net.ipv4.ip_local_port_range = 10000 65000
# 修改防火牆表大小，默認65536
net.netfilter.nf_conntrack_max=655350
net.netfilter.nf_conntrack_tcp_timeout_established=1200
# 確保無人能修改路由表
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
