nginx 502 bad gateway

2019-01-13 07:19发布

站内问答 / PHP
447 13 6

I get a 502 Bad Gateway with nginx when using spawn fcgi to spawn php5-cgi.

I use this to span an instance on server start using the following line in rc.local

/usr/bin/spawn-fcgi -a 127.0.0.1 -p 9000 -u www-data -g www-data -f /usr/bin/php5-cgi -P /var/run/fastcgi-php.pid

presumably I'm getting the error because the spawn-fcgi / php5-cgi dies and there is nothing listening there anymore to parse php.

I get nothing in the logs that I can see anywhere, I'm out of ideas (and new to this setup with nginx)

13条回答
啃猪蹄的小仙女
2楼-- · 2019-01-13 07:30

I executed my localhost and the page displayed the 502 bad gateway message. This helped me:

  1. Edit /etc/php5/fpm/pool.d/www.conf
  2. Change listen = /var/run/php5-fpm.sock to listen = 127.0.0.1:9000
  3. Ensure the location is set properly in nginx.conf.
  4. Run sudo service php5-fpm restart

Maybe it will help you.

Source from: http://wildlyinaccurate.com/solving-502-bad-gateway-with-nginx-php-fpm

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趁早两清
3楼-- · 2019-01-13 07:34

If running a linux server, make sure that your IPTABLES configuration is correct.

Execute sudo iptables -L -n , you will recieve a listing of your open ports. If there is not an Iptables Rule to open the port serving the fcgi script you will receive a 502 error. The Iptables Rule which opens the correct port must be listed before any rule which categorically rejects all packets (i.e. a rule of the form "REJECT ALL -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable or similar)

On my configuration, to properly open the port, I had to execute this command (assume my fcgi server is running at port 4567):

sudo iptables -I INPUT 1 -p tcp --dport 4567 -j ACCEPT

WARNING: This will open port 4567 to the whole world.

So it might be better to do something like this:

   sudo iptables-save >> backup.iptables
   sudo iptables -D INPUT 1 #Delete the previously entered rule
   sudo iptables -I INPUT 1 -p tcp --dport 8080 -s localhost -j ACCEPT # Add new rule

Doing this removed the 502 error for me.

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够拽才男人
4楼-- · 2019-01-13 07:36

I had the same problem while setting up an Ubuntu server. Turns out I was having the problem due to incorrect permissions on socket file.

If you are having the problem due to a permission problem, you can uncomment the following lines from: /etc/php5/fpm/pool.d/www.conf

listen.owner = www-data
listen.group = www-data
listen.mode = 0660

Alternatively, although I wouldn't recommend, you can give read and write permissions to all groups by using the following command.

sudo chmod go+rw /var/run/php5-fpm.sock
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Deceive 欺骗
5楼-- · 2019-01-13 07:43

Similar setup here and looks like it was just a bug in my code. At the start of my app I looked for the offending URL and this worked: echo '<html>test</html>'; exit();

In my case, turns out the problem was an uninitialized variable that only failed under peculiar circumstances.

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淡お忘
6楼-- · 2019-01-13 07:44

Hope this tip will save someone else's life. In my case the problem was that I ran out of memory, but only slightly, was hard to think about it. Wasted 3hrs on that. I recommend running:

sudo htop

or

sudo free -m

...along with running problematic requests on the server to see if your memory doesn't run out. And if it does like in my case, you need to create a swap file (unless you already have one).

I have followed this tutorial to create swap file on Ubuntu Server 14.04 and it worked just fine: http://www.cyberciti.biz/faq/ubuntu-linux-create-add-swap-file/

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疯言疯语
7楼-- · 2019-01-13 07:48

change

fastcgi_pass    unix:/var/run/php-fpm.sock;

to

fastcgi_pass    unix:/var/run/php5-fpm.sock;
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