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

(资料图)

完整源码放在最后

• 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/

• 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

• 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

• 安装一些扩展包

• 下载 Nginx 并解压缩

• 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

• 建立软连接

这一步看个人习惯可做可不做

• 注册服务

将 nginx 注册成服务之后就可以使用 systemctl 控制它了

• 内核参数优化

• 启动 nginx 并设置开机自启动

• 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

• main 函数

• 完整代码

执行结果如下：

#! /bin/bashversion=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nginxfunction 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 serverAfter=network-online.target remote-fs.target nss-lookup.targetWants=network-online.target[Service]Type=forkingPIDFile=/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.pidExecStartPre=/usr/local/nginx/sbin/nginx -tExecStart=/usr/local/nginx/sbin/nginxExecReload=/usr/local/nginx/sbin/nginx -s reloadKillSignal=SIGQUITTimeoutStopSec=5KillMode=processPrivateTmp=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 nginxfunction 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