Lighttpd problem

[gergokee]

I have lighty installed just for playing videos however i'm having to following problems:

Described in error log (videos stop playing when 2.problem occurs):

1. We waited 360 seconds. If this a problem increase server.max-write-idle

2. "... accept() failed: Too many open files"


The first problem is i think not server side , based on my invastigations in several forums. And it does not affect anything. However the second is a huge problem. After i install lighttpd. It works for about 5-6 hours, then the following message comes "... accept() failed: Too many open files" IT should mean there are too many open files or file descriptors, but i changed fd limit value to 4096 as i was guided from other forums, but the problem still exists.
what shell i do? Make it unlimited?

ps.: anyone having the same config must be having the first problem as well! Just check /var/log/lighttpd/error.log

[bplex]

The first error is a client-side problem. This is common if you are using connection throttling bandwidth throttling. What this means is that the person viewing the video stopped watching the video and went to another page before the video finished transferring to the client. The server will wait a specified amount of time to see if the connection comes back (so that it can resume transferring). If not, it closes the connection and moves on.

The second error is due to you running out of file descriptors. There are three things that you will need to do.

1. Make sure that you are running lighttpd as root and not as a normal user. Otherwise step two and three will not work.

2. Increase the maximum file descriptors:

server.max-fds = 2048

or

server.max-fds = 4096

3. Decrease the wait time before the server drops the file descriptors to make room for new connections:

server.max-keep-alive-requests = 4
server.max-keep-alive-idle = 4

Note that step three waits 4 seconds before dropping a connection to move on. If you still run into problems, you can tell the server to not use keep-alive at all by changing the keep-alives to 0. However, this will hurt performance if you do.

[admin]

1. We waited 360 seconds. If this a problem increase server.max-write-idle

Is not a problem, just ignore it, it is normal.

2. "... accept() failed: Too many open files"

In /etc/sysctl.conf

Add

# These ensure that TIME_WAIT ports either get reused or closed fast.
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_tw_recycle = 1

# TCP memory
net.core.rmem_max = 16777216
net.core.rmem_default = 16777216
net.core.netdev_max_backlog = 262144
net.core.somaxconn = 262144

net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2

net.core.wmem_max = 1048576
net.ipv4.tcp_wmem = 4096 87380 524288

In lighttpd conf add

# http://trac.lighttpd.net/trac/wiki/D...erformance#id4
server.max-keep-alive-requests = 4
server.max-keep-alive-idle = 4
server.event-handler = "linux-sysepoll"
#server.network-backend = "linux-sendfile"
server.network-backend = "writev"
server.max-fds = 8192
server.max-connections = 4096
server.stat-cache-engine = "fam"

[gergokee]

The 2.problem: i did what you advised but now i can't start lighttpd
error message:
Starting lighttpd: 2008-10-18 14:22:26: (configfile.c.236) server.stat-cache-engine can be one of "disable", "simple", but not: fam [FAILED]

i don't know if that's important but now i'm trying to test if it works withous that...

[admin]

For now set it to disabled by removing the line

server.stat-cache-engine = "fam"

Or install

yum -y install gamin
yum -y install gamin-devel

Then install lighttpd with

make clean && make distclean
./configure --with-fam

[gergokee]

Now it seems to be allright!!!

But tell me what does that fam do? Is it necessary, i mean what does it improve?

[admin]

fam do stat info caching, will slightly speed up.

[admin]

server.max-write-idle    = 6001

This will keep many pen connections and create problem in busy servers.

Wikipedia use

server.max-write-idle    = 30

See

http://www.buyscripts.in/vshare/wikiped ... k-2007.pdf

[gergokee]

yes you're right , that thing would screw up things... so i deleted it from my post, so that it won't misguide people!