Question Where can I check why nginx is going dead from time to time ?

[peter00]

Hello,

I'm new here

My ngix is going dead few times a day. Is there some log file where I can check what us the issue?

My Additional nginx directives server wide:

# you must set worker processes based on your CPU cores, nginx does not benefit from setting more than that
worker_processes auto; #some last versions calculate it automatically
worker_connections 1024;
worker_rlimit_nofile 2048;
add_header Cache-Control public;
add_header Pragma public;

# Fix ngix dead
proxy_connect_timeout 600;
proxy_send_timeout 600;
proxy_read_timeout 600;
send_timeout 600;

# Configure timeouts
client_body_timeout   12;
client_header_timeout 12;
#send_timeout          10;

#ssl_session_cache shared:SSL:1m; # holds approx 4000 sessions
#ssl_session_timeout 1h; # 1 hour during which sessions can be re-used.
#ssl_buffer_size 4k;

keepalive_disable msie6;        # disable selected browsers.

# The number of requests a client can make over a single keepalive connection. The default is 100, but a much higher value can be especially useful for testing with a load‑generation tool, which generally sends a large number of requests from a single client.
keepalive_requests 10000;

# How long an idle keepalive connection remains open.
keepalive_timeout 5;

upstream backend {
    # The number of idle keepalive connections to an upstream server that remain open for each worker process
    keepalive 32;
}

 

[TravisB]

Hi @peter00,

That's no good.

I hope the below information helps you diagnose the problem.

nginx

• Logs
  • Global logs:
    • Access log: /var/log/nginx/access.log
    • Error log: /var/log/nginx/error.log
  • Domain logs:
    • Access logs:
      • HTTP log: /var/www/vhosts/system/<domain_name>/logs/proxy_access_log
      • HTTPS log: /var/www/vhosts/system/<domain_name>/proxy_access_ssl_log
    • Error log: /var/www/vhosts/system/<domain_name>/proxy_error_log

(Snippet from  Plesk for Linux services logs and configuration files)

 

[Bitpalast]

Could you please describe in more detail what "going dead" means to you in terms of Nginx? Is the service actually down?
# service nginx status
Or do you see a 502 error message on a website? (Which would mean that Nginx is up and Apache is not responding.)
Please give more details.