#!/bin/bash# 定义要下载的 Nginx 源码包的 URL 和保存路径
nginx_tar="http://nginx.org/download/nginx-1.19.0.tar.gz"
nginx_tar_file="/tmp/nginx-1.19.0.tar.gz"
nginx_version="nginx-1.19.0"
nginx_path=$(which nginx)  # 获取 Nginx 的路径# 检查 Nginx 是否已安装并获取路径
function check_nginx_installed {# -z 判断字符串是否为空if [ -z "$nginx_path" ]; thenecho "Nginx is not installed or not found in PATH"exit 1fiecho "Nginx is installed at: $nginx_path"  # 输出 Nginx 路径
}# 检查 Nginx 进程是否在运行
function check_nginx_status {nginx_status=$(ps -ef | grep -v grep | grep nginx | wc -l)if [ "$nginx_status" -gt 0 ]; thenecho "nginx is running"elseecho "nginx is not running"exit 1fi
}# 下载 Nginx 源码包
function download_nginx {if [ ! -f "$nginx_tar_file" ]; thenecho "Downloading $nginx_version..."wget -P /tmp "$nginx_tar"elseecho "$nginx_version already exists"fi
}# 解压 Nginx 源码包
function extract_nginx {cd /tmp if [ ! -f /tmp"$nginx_version" ]; thenecho "Extracting $nginx_version..."tar -zxvf $nginx_tar_filefi
}# 安装yum -y install pcre-devel zlib-devel openssl-devel  gd-devel geoip-devel gcc gcc-c++ make
function install_dependence {yum -y install pcre-devel zlib-devel openssl-devel  gd-devel geoip-devel gcc gcc-c++ make coreutils
}# 编译和安装 Nginx
function compile_and_install_nginx {cd /tmp/$nginx_version || exitecho "Checking nginx compile info..."nginx_compile_info=$($nginx_path -V 2>&1 | sed -n 's/.*configure arguments: //p')echo "Configuring nginx...   $nginx_compile_info"./configure $nginx_compile_infoecho "Compiling nginx..."makemv $nginx_path{,.bak}cp objs/nginx $nginx_path
}# 获取 Nginx PID 文件路径
function get_nginx_pid_path {nginx_pid_path=$($nginx_path -V 2>&1 | sed -n 's/.*--pid-path=\([^ ]*\).*/\1/p')echo "$nginx_pid_path"
}# 检查 PID 文件
function check_nginx_pid {local nginx_pid_pathnginx_pid_path=$(get_nginx_pid_path)# 检查 PID 文件是否存在if [ -f "$nginx_pid_path" ]; thenlocal master_pidmaster_pid=$(cat "$nginx_pid_path")  # 获取主进程 PID# 获取当前主进程和工作进程的数量local master_countlocal worker_countmaster_count=$(pgrep -c -F "$nginx_pid_path")  # 计算主进程数量worker_count=$(pgrep -c -P "$master_pid" -u nginx)  # 计算工作进程数量echo "Current master process PID: $master_pid"echo "Number of master processes: $master_count"echo "Number of worker processes: $worker_count"# 向主进程发送信号以重新加载kill -USR2 "$master_pid"# 处理旧版本进程if [ -f "${nginx_pid_path}.oldbin" ]; thenkill -WINCH "$(cat "${nginx_pid_path}.oldbin")"kill -QUIT "$(cat "${nginx_pid_path}.oldbin")"fielseecho "$nginx_version PID file does not exist"fi
}# 检查 Nginx 进程状态
function check_nginx_process {local cpu_corescpu_cores=$(grep -c 'cpu cores' /proc/cpuinfo)local nginx_pid_pathnginx_pid_path=$(get_nginx_pid_path)if [ -s "$nginx_pid_path" ]; thenlocal master_numlocal slave_nummaster_num=$(pgrep -c -F "$nginx_pid_path")slave_num=$(pgrep -c -P "$(cat "$nginx_pid_path")" -u nginx)if [ "$master_num" -eq 0 ] || [ "$slave_num" -lt "$cpu_cores" ]; thenecho "Nginx process may have a problem!!!"fielseecho "Nginx PID file may have a problem!!!"fiecho "Nginx process is running with pid $nginx_pid_path"
}# 主程序逻辑
check_nginx_installed
check_nginx_status
download_nginx
extract_nginx
install_dependence
compile_and_install_nginx
check_nginx_pid
check_nginx_process