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70/20 answers
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Feb
18
comment CentOS system emails fail
What have you done to configure the SMTP server on your machine? What have you done to provide email origin authentication?
Feb
12
comment Idea for taking down half of the servers vs rolling restart?
Out of curiosity what are doing at the DB tier to achieve your zero downtime deployment?
Feb
7
comment Apache bottle neck
Can you take nginx out of the picture first?
Feb
7
comment Apache bottle neck
I suggest you try mod_php as Tomestzky suggested.
Feb
7
comment Apache bottle neck
Are there corresponding entries in /var/log/messages? What version of nginx are you using? nginx -v
Feb
6
comment Apache bottle neck
Re: nginx, check its nginx_error.log file.
Feb
6
comment Apache bottle neck
What do you mean by "Once it hits 7000 requests it hangs"? Your MaxClients is 150. Are you saying that if you send 7000 requests in /serial/ fashion to your webserver once it hits the 7000th request it just hangs? e.g. ab -c 1 -n 7000 example.com
Jan
29
comment Apache taking 32 seconds for response
Do a mysqladmin -i 1 processlist while you're waiting for the response in the browser. If the SQL query executes quickly then profile your PHP code.
Jan
29
comment Apache taking 32 seconds for response
What filesystem is MySQL on? ext4?
Jan
29
comment Apache taking 32 seconds for response
What is the response time like for a static html page?
Jan
25
comment What Linux command do I type to see my MySQL server load in real time?
Collect metrics with Cacti or Munin.
Jan
20
comment How do I take backup of mysql databases from my crashed server
Fedora 5?! It went end of life OVER 5 YEARS AGO: redhat.com/archives/fedora-announce-list/2007-July/…
Jan
6
comment Load avg weirdness on Linux Ubuntu
Have you tried using psacct to narrow it down?
Dec
9
comment “X_FORWARDED_FOR” Header Doesn't Present In The Request
Please show your tomcat configuration where XFF is set.
Dec
5
comment How to improve availability on a starting up PHP+MySQL application?
You are trying to boil the ocean. Each one of availability, performance and scalability requires separate, in-depth investigation and an intimate knowledge of your application/environment. You're kind of cavalier about having MySQL replicating across data centers in particular. That is a hard problem to solve and not inexpensive. There are solutions for it like Percona's XtraDB Cluster (Galera) and Continuent's Tungsten Cluster but each requires a substantial investment in time and money. There are solutions but be realistic, you're not going to change this overnight and it's going to cost $$.
Nov
13
comment How to diagnose PHP server execution times to reduce them?
+1 for New Relic suggestion
Nov
13
comment Apache is serving from the first virtualhost for all subdomains and main domain
I just posted as an answer. Kindly accept. Thanks!
Nov
12
comment Apache is serving from the first virtualhost for all subdomains and main domain
Where is your NameVirtualHost xx.xx.144.72:443 directive?
Oct
23
comment qemu-img: Could not open $FILE
@mgorven, I tried that too but it doesn't seem to matter.
Oct
23
comment Weird PHP upload behaviour
Is Prod behind a reverse proxy?