2020年2月 – gitweixin

bug清单 2月 23,2020

配置nginx ssl证书问题排查

小程序的ssl证书过期了，重新生成证书，替换证书后，在小程序还提示连接超时，看网上说https不安全也有这个提示。

访问访问，果然提示证书过期了。

检查nginx配置文件

server {    
 listen 80;
 server_name bjubi.com;// 你的域名    
 rewrite ^(.*)$ https://$host$1 permanent;// 把http的域名请求转成https
 }

server {
  listen 443;   
  server_name bjubi.com; // 你的域名    
  ssl on;   
  root /var/www/bjubi.com; // 前台文件存放文件夹，可改成别的   
  index index.html index.htm;// 上面配置的文件夹里面的index.html         ssl_certificate  cert/214292799730473.pem;// 改成你的证书的名字     ssl_certificate_key cert/214292799730473.key;// 你的证书的名字     ssl_session_timeout 5m;  
   ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;   
  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;   
  ssl_prefer_server_ciphers on;   
  location / {  
       index index.html index.htm;
     } 
} 
觉得配置没问题，继续排查

 
配置完成后，检查一下nginx配置文件是否可用，有successful表示可用。
$ nginx -t // 检查nginx配置文件 
返回结果如下：
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
 nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
觉得配置应该没问题。

 为了使配置生效
nginx -s reload // 使配置生效 
shell提示：  nginx: [alert] kill(1617, 1) failed (3: No such process)
果然出问题了。


 
[root@localhost /]# whereis ngnix
ngnix:[root@localhost/]# 
[root@localhost /]# find / -name nginx 
/usr/local/src/nginx/sbin/nginx
[root@localhost /]# find / -name nginx.conf
/usr/local/nginx
 /usr/local/nginx/sbin/nginx
 /usr/bin/nginx
 /etc/rc.d/init.d/nginx
[root@localhost /]# /usr/local/src/nginx/sbin/nginx -c nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
 nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
 nginx: [emerg] still could not bind()

端口被绑定了，需要先kill掉占用的线程
 
netstat -ntlp 

shell返回结果如下：
Active Internet connections (only servers)
 Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
 tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      28256/mysqld        
 tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      3301/nginx: worker  
 tcp        0      0 0.0.0.0:21              0.0.0.0:*               LISTEN      919/pure-ftpd       
 tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      2565/sshd           
 tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      3301/nginx: worker  
 tcp6       0      0 :::21                   :::*                    LISTEN      919/pure-ftpd   

使用命令 kill -9 3301
再制定配置 /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
 nginx -s reload            
重启nginx，果然证书生效了。

作者 east

spring 2月 6,2020

凯利公式源代码

凯利公式如下：

仓位 =（odds *pwin-q）/b

　　odds = 赔率（赔率=期望盈利÷可能亏损=2美元盈利÷1美元亏损，赔率就是2了）

　　pwin = 成功概率（抛硬币正反面都是50%的概率）

　　q = 失败概率（也就是 1-p，赌局中也是50%了）


public class kellyUtil {

    /**
     *   凯利公式
     * @param pwin  胜率
     * @param odds  赔率
     * @return
     */
    public static double kelly(double pwin,double odds){
        return (odds * pwin + pwin - 1)/odds;
    }

    public static double kellyV2(double pwin,double odds, double lossRate){
        return (odds * pwin + pwin - 1)/(odds * lossRate);
    }

    /**
     * 巴菲特版仓位管理
     * @param pwin
     * @return
     */
    public static double buffett(double pwin){
        return 2 * pwin - 1;
    }

    public static void main(String[] args) {
        double odds = kelly(0.5, 3.0);
      //  double odds = kellyV2(0.5, 3.0,1.5);
        System.out.println(("仓位:" + odds * 100 + "%"));
    }
}

作者 east

月度归档2月 2020