nginx监控脚本

```
#!/bin/bash

START_TIME=$(date '+%Y-%m-%d %H:%M:%S')
echo "$START_TIME - 脚本开始"

# Nginx可执行文件的路径
NGINX_BIN="/home/nginx/ng/sbin/nginx"

# 预期的Nginx worker进程数量
EXPECTED_WORKERS=4

# 检查master进程
MASTER_PID=$(pgrep -f 'nginx: master process')

# 检查worker进程数量
WORKER_COUNT=$(ps aux | grep 'nginx: worker process' | grep -v grep | wc -l)

# 检查Nginx master进程是否运行
if [ -z "$MASTER_PID" ]; then
    echo "Nginx master进程未运行。尝试启动Nginx..."
    $NGINX_BIN -c /home/nginx/ng/conf/nginx.conf
else
    echo "Nginx master进程已在运行，PID：$MASTER_PID。"
fi

# 如果worker进程数量不符合预期，则尝试重启Nginx
if [ "$WORKER_COUNT" -ne "$EXPECTED_WORKERS" ]; then
    echo "Nginx worker进程数量不符合预期（期望$EXPECTED_WORKERS个，实际$WORKER_COUNT个）。正在尝试重启Nginx服务..."
    $NGINX_BIN -s reload
    if [ $? -ne 0 ]; then
        echo "重载Nginx配置失败，尝试重新启动Nginx..."
        $NGINX_BIN -c /home/nginx/ng/conf/nginx.conf
    fi
    # 等待几秒钟让Nginx服务启动
    sleep 5
fi

# 再次检查worker进程数量
WORKERS_AFTER_RESTART=$(ps aux | grep 'nginx: worker process' | grep -v grep | wc -l)

# 最终检查
if [ -n "$MASTER_PID" ] && [ "$WORKERS_AFTER_RESTART" -eq "$EXPECTED_WORKERS" ]; then
    echo "Nginx进程运行正常。"
    exit 0
else
    echo "Nginx进程运行异常。"
    exit 1
fi

END_TIME=$(date '+%Y-%m-%d %H:%M:%S')
echo "$END_TIME - 脚本结束"
```