Centos 7 上使用nginx为Node.js配置反向代理时错误:(13: Permission denied) while connecting to upstream

错误来源:Centos 7 上使用nginx为Node.js配置反向代理时产生(13: Permission denied) while connecting to upstream的错误

nginx配置文件内容如下:

upstream node_server {
   server 127.0.0.1:5000 max_fails=3 fail_timeout=4s;
   server 127.0.0.1:5001 max_fails=3 fail_timeout=4s;
}

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    index index.html index.htm;

    server_name _;


    location / {
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_redirect off;
        proxy_buffer_size 16k;
        proxy_buffers 4 32k;
        proxy_pass http://node_server;
    }

    location /public/ {
        root /opt/app;
    }
}

使用Node.js静态文件交由nginx管理,而动态的请求有Node.js处理(app.js需要重新配置),配置成功后分别启动nginx服务和Node.js服务,访问http:127.0.0.1出现 502 服务器端错误,

查阅各种资料发虽然有nginx在反向代理配置时虽然有出现此类错误,但并没有解决问题。

查看nginx错误日志:

cat /var/log/nginx/error.log

发现错误:failed (13: Permission denied) while connecting to upstream

原因及解决方案:问题是由SElinux导致,查看audit日志:

sudo cat /var/log/audit/audit.log | grep nginx | grep denied

 

错误信息:

type=AVC msg=audit(1437452895.972:639): avc: denied { name_connect } for pid=5884 comm="nginx" dest=5000 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:commplex_main_port_t:s0 tclass=tcp_socket permissive=0

修复此错误:

sudo cat /var/log/audit/audit.log | grep nginx | grep denied | audit2allow -M mynginx
sudo semodule -i mynginx.pp

问题最终得到解决。(附上最终成功界面截图)

解决方法在stackoverflow中的链接为:http://stackoverflow.com/questions/23948527/13-permission-denied-while-connecting-to-upstreamnginx

相关知识链接:1.SElinux http://vbird.dic.ksu.edu.tw/linux_basic/0440processcontrol_5.php

                    2.audit2allow https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Security-Enhanced_Linux/sect-Security-Enhanced_Linux-Fixing_Problems-Allowing_Access_audit2allow.html

posted @ 2015-07-21 14:55  jeffzhangme  阅读(4692)  评论(0编辑  收藏  举报