Looking for scaling Eclipse Che (a cloud IDE), I'm implementing a Che Farm. In short, a group of Eclipse Che instances behind a reverse proxy.

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Ok, I'm implementing the reverse proxy using Nginx on an EC2 instance using Amazon Linux AMI, but I found this problem: Eclipse Che needs opened the port 8080 for the client and the range 32768-65535 for its workspaces (more info here).

So, I modified the nginx.conf file like this:

server {
    listen 32768;
    listen 32769;
    listen 32770;
    listen 32771;
    listen 65534;
    listen 65535;

    server_name  http://eclipse.company.cxx;

    location / {
        proxy_pass  http://eclipse.company.local:$server_port;

After restart nginx, I got this message:

$ sudo service nginx restart
nginx: [emerg] socket() failed (24: Too many open files)
nginx: configuration file /etc/nginx/nginx.conf test failed

Two questions, please:

  1. Is this a valid approach for implement a reverse proxy in this situation?
  2. If this is valid, how can I fix the error "Too many open files"?
  • Not sure about your environment, just as a hint: Is the machine in question publicly reachable? If so, implement authentication / authorization, or use a VPN.

    If this is valid, how can I fix the error "Too many open files"?

  • Probably, because it's listening to that many ports, your nginx, runs against limits, specifically the ones dealing with file descriptor(s), which "[...] is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket [...]".

  • To tune these limits:

    • Leverage the nginx directive worker_rlimit_nofile.
    • If this is not enough:

      • Change the system wide limit, which is stored in /proc/sys/file-max. To alter it run sysctl -w fs.file-max=${your-new-limit}. To make it persistent across reboots etc. edit /etc/sysctl.conf.
      • Change the user limit, which is stored in /etc/security/limits.conf: Inside there, put for example two lines reading:

        nginx soft nofile ${your-new-soft-limit} 
        nginx hard nofile ${your-new-hard-limit}

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