6,665 reputation
1335
bio website twitter.com/ddrager
location Coatesville, PA
age 34
visits member for 5 years, 2 months
seen yesterday

CTO of XDA Developers.

Linux systems are my specialty. As with any good system administrator, I dabble in networking, storage, virtualization, Android, and more.

LOPSA since 2008

I enjoy spending time with my family, social media, gaming and going backpacking. I have also blogged professionally for MakeUseOf, Lifehacker, and my own personal blog about system adminstration.


Dec
20
comment Disk write speed much slower than read speed
nb: WiredTree states RAID10 on their website.
Nov
19
comment php5-fpm spike, wrong configuration?
It is really impossible to know without seeing the said scripts that are hitting PHP. Are you hitting CPU or memory limits? You said it is using 70-80%, what was it before? Is it slowness in PHP or in the network latency on the ajax scripts?
Nov
14
comment How to diagnose PHP server execution times to reduce them?
As others have stated, if you have eliminated the PHP processing time, then likely it is the setup time. Spawning the php process, reading the file, etc. Personally I like php-fpm running all the time, plus APC or Xcache for file caching. Try that setup and see how it impacts your PHP load times.
Aug
9
comment Issue testing website migration using IP address
Updated answer to reflect this information
Aug
9
comment How to prevent DDOS syn attack
<3 mod_evasive!
Aug
23
comment Why does my ssh timeout vary with network location?
This is a setting on the client endpoint, so although if you are in a hostile environment this might add to the ability for someone to spoof you, it is very highly unlikely to make an impact on the security of the connection. I can't really see this causing extra load, either.
Feb
17
comment Intermittent DNS timeouts, independent of DNS provider
What is your network setup, and do you have any sort of QoS or filtering appliances in place? Firewalls?
Feb
17
comment named Cluster DNS breaking ssh
Drop ssh from the troubleshooting and use dig to do a direct query on your DNS server to see if it is responding properly. Let us know what dig shows for the hostnames. You can use 'dig c0-0 @ip.of.dns.server' to query the server directly.
Feb
16
comment Install Google tracking, apache level
Ah ha, I didn't try it, but sounds right.
Feb
11
comment Is 2008 Server Core installation the most secure option?
This is a tricky question.... define 'best'. Put the 'best', most expensive tools in the hand of an amateur and you will still be insecure.
Jan
26
comment DDOS by several IPs with one connection
What do you use as the firewall on the system? Plain-jane IPtables?
Jan
25
comment Setting up individually accessible public_html for each user of a linux machine
/etc/hosts does not affect anything other than local DNS resolution on the machine. You will need to add the correct records to the DNS server who is authoritive for yourdomain.com.
Jan
24
comment openwrt dmz nat loopback not working
Have read your question 3 times but I am still not sure what you are getting at. Could you please rephrase the question? If I get the gist of your question you need to allow access to your LAN from the DMZ ip address, but I am not sure if that is what you are getting at or not.
Jan
11
comment Why is ntpd not updating the time on my server?
I was the admin on several VPS platforms, none of them (openvz, Xen) have access to set the clock on the system. They all had to be done at the host level. Submit a ticket with your host to indicate the time is off, they should be running ntp and have the time synchronized for you.
Jan
10
comment Why is ntpd not updating the time on my server?
After you use ntpdate to set the clock, use 'hwclock --systohc' to sync "running" time to your hardware clock. It is supposed to sync on a reboot but if your machine crashes (or otherwise had a problem doing a proper shutdown) it could not sync it.
Dec
20
comment Problem closing Port 25
If you telnet to port 25 (from the outside), what banner does it show? Are you certain it is connecting to your Windows 2008 server?
Dec
3
comment Tar directory gives me error, won't let me tar!
That would be my guess as well.
Sep
27
comment How much memory would be needed for a Wordpress site with 8.000 hits per day with the occasional spike?
27! I try to minimize the number of plugins because, depending on the plugin, they can really slow down a site! Do you have access to current memory usage wherever you are? That is the most accurate way to see what you might need. I know it depends on your budget and how much the site generates, but I would spring for a dedicated server if possible. If not, you could always get 2GB and then upgrade - with a VPS it is 'easy' to upgrade RAM.
Sep
27
comment How much memory would be needed for a Wordpress site with 8.000 hits per day with the occasional spike?
It is in European number format jer.salamon
Aug
15
comment Redhat / CentOS Static Routing Problem
Thank you, and yes, I ended up going this way! I forgot to KISS!