Here’s how to restart networking services on your linux webserver. I find that especially with VPS web servers, there are times where your network gets blocked completely.
To reset, get into SSH via console on your VPS web server company’s control panel.
Type:
service network stop
then
service network start
For some web servers, you might have to use:
/sbin/service network stop
and
/sbin/service network start
Wait like 5 seconds and see if you can ping the outside world:
ping google.com
If you
For those of you who are getting DoS attacks and whatnot on your CentOS server, you might want to first make sure you have only WWW (port 80) and SSH (port 22) open.
You can do this with iptables (which is pain is the a**) or just use this: yum install system-config-securitylevel Then do: /usr/bin/system-config-securitylevel-tui
And there’s a “Customize” menu where you can set WWW and SSH open.
If your website does a lot of queries via domain names such as aggregating RSS feeds or even a Twitter app site that accesses Twitter API, you might benefit from installing DNS cache on your linux web server.
For most, you would benefit from installing DNS cache because it will save you a ton of time for your server to fetch IP addreses. (could be anywhere between 5 to 500ms).
I’ve actually found a great article showing you how to do this on a Linux desktop computer. It actually works fine on web servers too.