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66
votes
8answers
144k views

What limits the maximum number of connections on a Linux server?

What kernel parameter or other settings control the maximum number of TCP sockets that can be open on a Linux server? What are the tradeoffs of allowing more connections? I noticed while load testing ...
4
votes
3answers
2k views

Apache performance issue, after “1000 total children” Apache no longer responds to HTTP requests. Not MaxClients issue?

Hoping someone can point me in the right direction as I've spent the last week trying to figure out where the "issue" is but haven't been able to, tried posting to the Apache users mailing lists but ...
8
votes
5answers
7k views

How to fine-tune our MySQL server?

MySQL is not my thing, yet I need to fine-tune one of our servers. Here are the requirements/specs: The MySQL server has only one significant database We only have one "type" of application ...
15
votes
4answers
18k views

Need to increase nginx throughput to an upstream unix socket — linux kernel tuning?

I am running an nginx server that acts as a proxy to an upstream unix socket, like this: upstream app_server { server unix:/tmp/app.sock fail_timeout=0; } server { listen ###.###.###....
3
votes
3answers
2k views

Assigning Processes to CPU Cores

I have access to a CentOS 6 web server (a PHP/MySQL forum) running Apache 2.2.15 and MySQL 5.1.52. This box has dual oct-core Xeons. What I find looking over the CPU graphs is that the first two ...
1
vote
1answer
3k views

Postfix seems too aggressive while sending newsletters

I'm having a problem sending newsletters to certain domains/servers, like yahoo or minor network providers. It's like I'm spamming their servers with connections and they tell me to stop after a short ...