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visits member for 5 years, 1 month
seen Jul 10 at 14:27

Systems Administrator, Site Reliability Engineer


Oct
2
comment 100% uptime for a web application
-1 because this is a practical answer but not useful at all. All questions in this site could be answered by "hire someone else to do it", but that is not why we are here.
Apr
6
comment How do I switch servers for a web site with minimum disruption?
No, but you should test the new public IP first to make sure it's setup correctly and your website is reachable, before switch the DNS entry.
Mar
22
comment Debian squeeze high memory usage?
Disk buffer caching is very important for performance so it's healthy to leave lots of RAM for this purpose. Just keep this in mind.
Mar
20
comment Intermittent MySQL database connection errors on Ubuntu server
You should try leaving vmstat 5 running all the time, until the problem happens again. Also have a separate screen running: iostat -x 5. Then when your system hangs, copy the last 10 values of the output of those guys and look for suspicious things. But remember we can't troubleshoot everything for you, that's not the purpose of this website.
Mar
20
comment Intermittent MySQL database connection errors on Ubuntu server
At the time you ran vmstat your system was pretty quiet. The only fun stuff that happened were a few blocks of data being written into disk. But that's low volume.
Mar
10
comment should I activate keepAlive in apache2
Server side resource usage is more important than user-perceived latency?
Apr
19
comment /server-status shows over 240 requests like “OPTIONS * HTTP/1.0” 200 - “-” “Apache (internal dummy connection)”
Also, you may not be so lucky to see the live connections if they are short-lived. In this case, there are other options: 1) run a tcpdump to see when the connections are open, then find the PID of the client process using the process above. Again, you may not be able to do this fast enough. 2) Add a firewall rule that logs access to that specific port on localhost and prints the PID of the calling process (dunno if this is easy to do on a FreeBSD system)
Nov
10
comment Ping responses don't make it back to mailserver behind watchguard firewall
I don't think this is an ARP issue. It would be much more obvious - no local connections inbound or outband to this machine would work (including SSH, local ping).
Nov
10
comment My DNS works! But, what is the simplest way to add something to it?
That's true, thanks for pointing that out.