Logging in to bogged down system? 2006-03-28 - By Rick Stevens
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On Tue, 2006-03-28 at 17:17 -0800, Harold Hallikainen wrote:
> My FC4 system has been running great for months. But today, I headed
> for Arkansas and the server is in California. Once I got here to AR, I
> noticed that it was serving web pages real slowly. I logged in using
> ssh and ran top. I found a TON of httpd processes running, using, at
> that time, 86% of the processor time. I figured I'd try to reboot the
> system through ssh, but now I can't even get in to it that way. I
> connect, but the password is never requested. Instead, I get
> "ssh_exchange_identification: read: Connection reset by peer
> ". So, anything I can do from a couple thousand miles away?
Just keep trying or get someone to hard boot it. You should also
put the following tweaks in your /etc/sysctl.conf file to tweak
HTTP session handling:
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_syn_retries = 3
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
These will force faster recycling of the TCP connections and will help
block some DDOS attacks.
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
- Rick Stevens, Senior Systems Engineer rstevens@(protected) -
- VitalStream, Inc. http://www.vitalstream.com -
- -
- "If you can't fix it...duct tape it!" - Tim Allen -
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