今天咸鱼给大家分享个源码编译安装 Nginx 的 shell 脚本
这个 shell 脚本可重复执行
完整源码放在最后
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定义一个变量来存放 nginx 版本号
version=1.15.4
nginx 下载地址：http://nginx.org/download/
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下列函数功能则是判断当前步骤是否执行成功，并将结果输出出来
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创建 nginx 用户和用户组
建议用大于 1000 的 GID 和 UID 号，表示普通用户
这段代码里我做了一个条件判断：
如果在 /etc/passwd 和 /etc/group 文件中过滤出 nginx，表示已经创建了 nginx 用户和 nginx 用户组，就不再创建了
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安装一些扩展包
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下载 Nginx 并解压缩
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编译安装 Nginx
这里也做了一个条件判断：
如果 /usr/local/nginx 目录存在，则说明 nginx 已经成功安装好了
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建立软连接
这一步看个人习惯可做可不做
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注册服务
将 nginx 注册成服务之后就可以使用 systemctl 控制它了
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内核参数优化
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启动 nginx 并设置开机自启动
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负责配置写入的函数
在上面的内核参数优化函数里面，我并没有使用 echo 将配置直接重定向到 /etc/sysctl.conf 文件里面
而是用了 add_config_tofile 函数，第一个参数是配置项，第二个参数是文件名
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main 函数
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完整代码
执行结果如下：
#! /bin/bash version=1.15.4 #判断函数是否执行成功 function show_result(){ if [ "$1" -eq 0 ] then echo -e "e[32m$2 is Success . [ OK ] e[0m" else echo -e "e[31m$2 is Fail . [ FAIL ] e[0m" fi } #创建 nginx 用户和用户组 function user_create(){ local item="Create User and Group" if [ `cat /etc/{passwd,group} | grep nginx | wc -l ` -ge 2 ]; then echo -e "e[31mUser and Group exist! e[0m" else groupadd -g 1004 nginx && useradd -u 1004 -g 1004 -M -s /sbin/nologin nginx show_result $? "${item}" fi } #下载一些拓展包 function nginx_pkg(){ local item="Packages Install" yum -y install gcc openssl-devel pcre-devel zlib-devel > /dev/null 2>&1 show_result $? "${item}" } #下载nginx function nginx_download(){ local item="Nginx Download" cd /usr/local/src && wget http://nginx.org/download/nginx-${version}.tar.gz > /dev/null 2>&1 test -e /usr/local/src/nginx-${version} || tar zxf nginx-${version}.tar.gz rm -rf /usr/local/src/nginx-${version}.tar.gz show_result $? "${item}" } #编译安装 function nginx_compile(){ local item="Nginx Compile" cd /usr/local/src/nginx-${version} if [ `ls -l /usr/local/ | grep 'nginx' | wc -l` -ge 1 ]; then echo -e "e[31mNginx exist! e[0m" else ./configure --prefix=/usr/local/nginx > /dev/null 2>&1 && make > /dev/null 2>&1 && make install > /dev/null 2>&1 fi show_result $? "${item}" } #软连接建立 function nginx_softlink(){ local item="Nginx Softlink" test -d /etc/nginx/ || ln -s /usr/local/nginx/conf/ /etc/nginx test -e /usr/sbin/nginx || ln -s /usr/local/nginx/sbin/nginx /usr/sbin/ show_result $? "${item}" } #注册服务 function nginx_service(){ local item="Nginx Service" test -e /usr/lib/systemd/system/nginx.service || echo ' [Unit] Description=The nginx HTTP and reverse proxy server After=network-online.target remote-fs.target nss-lookup.target Wants=network-online.target [Service] Type=forking PIDFile=/usr/local/nginx/logs/nginx.pid # Nginx will fail to start if /run/nginx.pid already exists but has the wrong # SELinux context. This might happen when running `nginx -t` from the cmdline. # https://bugzilla.redhat.com/show_bug.cgi?id=1268621ExecStartPre=/usr/bin/rm-f /usr/local/nginx/logs/nginx.pid ExecStartPre=/usr/local/nginx/sbin/nginx -t ExecStart=/usr/local/nginx/sbin/nginx ExecReload=/usr/local/nginx/sbin/nginx -s reload KillSignal=SIGQUIT TimeoutStopSec=5 KillMode=process PrivateTmp=true ' > /usr/lib/systemd/system/nginx.service systemctl daemon-reload show_result $? "${item}" } #内核优化 function nginx_kernel(){ local item="Optimize Kernel Arguments" cp /etc/sysctl.conf /etc/sysctl.conf.${current_time} > /dev/null 2>&1 arch_ratio=$([[ ! -z $(uname -a | grep x86_64) ]] && expr 64 / 32 || expr 32 / 32) memory_size=$(free -b| awk 'NR==2{print $2}') nf_conntrack_size=$(expr ${memory_size} / 16384 / ${arch_ratio}) #开启反向路径过滤 add_config_tofile "net.ipv4.conf.default.rp_filter = 1" /etc/sysctl.conf add_config_tofile "net.ipv4.conf.all.rp_filter = 1" /etc/sysctl.conf #处理无源路由包 add_config_tofile "net.ipv4.conf.all.accept_source_route = 0" /etc/sysctl.conf add_config_tofile "net.ipv4.conf.default.accept_source_route = 0" /etc/sysctl.conf #core文件名中添加pid作为扩展名 add_config_tofile "kernel.core_uses_pid = 1" /etc/sysctl.conf #开启syn洪水攻击保护 add_config_tofile "net.ipv4.tcp_syncookies = 1" /etc/sysctl.conf #修改消息队列长度 add_config_tofile "kernel.msgmnb = 65536" /etc/sysctl.conf add_config_tofile "kernel.msgmax = 65536" /etc/sysctl.conf #修改最大内存共享段大小bytes add_config_tofile "kernel.shmmax = 68719476736" /etc/sysctl.conf add_config_tofile "kernel.shmall = 4294967296" /etc/sysctl.conf #timewait数量默认18000 add_config_tofile "net.ipv4.tcp_max_tw_buckets = 600" /etc/sysctl.conf add_config_tofile "net.ipv4.tcp_sack = 1" /etc/sysctl.conf add_config_tofile "net.ipv4.tcp_window_scaling = 1" /etc/sysctl.conf add_config_tofile "net.ipv4.tcp_rmem = 4096 87380 16777216" /etc/sysctl.conf add_config_tofile "net.ipv4.tcp_wmem = 4096 65536 16777216" /etc/sysctl.conf add_config_tofile "net.core.rmem_default = 8388608" /etc/sysctl.conf add_config_tofile "net.core.wmem_max = 16777216" /etc/sysctl.conf #未收到客户端确认信息连接请求的最大值 add_config_tofile "net.ipv4.tcp_max_syn_backlog = 262144" /etc/sysctl.conf #放弃建立连接之前发送的synack包 add_config_tofile "net.ipv4.tcp_syn_retries = 2" /etc/sysctl.conf #开启重用，允许time—wait socket 重新用语新的tcp连接 add_config_tofile "net.ipv4.tcp_tw_reuse = 1" /etc/sysctl.conf add_config_tofile "net.ipv4.tcp_fin_timeout = 1" /etc/sysctl.conf #防止简单的ddos攻击 add_config_tofile "net.ipv4.tcp_max_orphans = 3276800" /etc/sysctl.conf #启用timewait快速收回 add_config_tofile "net.ipv4.tcp_tw_recycle = 0" /etc/sysctl.conf #keeptime启用时tcp发送keepalive消息的频度，默认2h add_config_tofile "net.ipv4.tcp_keepalive_time = 600" /etc/sysctl.conf #允许系统打开的端口范围 add_config_tofile "net.ipv4.ip_local_port_range = 1024 65535" /etc/sysctl.conf #资源回收 add_config_tofile "net.ipv4.tcp_tw_recycle = 0" /etc/sysctl.conf #路由转发 add_config_tofile "net.ipv4.ip_forward = 1" /etc/sysctl.conf #修改防火墙连接跟踪表大小，默认65535 add_config_tofile "net.netfilter.nf_conntrack_max = ${nf_conntrack_size}" /etc/sysctl.conf add_config_tofile "net.nf_conntrack_max = ${nf_conntrack_size}" /etc/sysctl.conf #解禁ping add_config_tofile "net.ipv4.icmp_echo_ignore_all = 0" /etc/sysctl.conf modprobe bridge sysctl -p > /dev/null 2>&1 show_result $? "${item}" } #启动 nginx function nginx_start(){ local item="Nginx start" systemctl enable nginx --now > /dev/null 2>&1 show_result $? "${item}" } #负责写入配置的函数 function add_config_tofile(){ local keywords=`echo $1| awk -F "[= ]+" '{print $1}'` local SearchResult=`grep "^${keywords}" "$2"` if [ -z "${SearchResult}" ] then echo $1 >> $2 else sed -i "s/^${keywords}.*/$1/" $2 fi } #主函数 function main(){ user_create nginx_pkg nginx_download nginx_compile nginx_softlink nginx_service nginx_kernel nginx_start } main
