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Apache, Mysql, and PHP configuration and optimization [HELP]
I am running a 512mb RAM, 1 core, 20GB SSD VPS from Digital Ocean.
First off, please don't tell me to use the lowendscript, it uses nginx. I need to run Apache for my WordPress websites. Yes I have tried running ngnix and php-fpm. I had a heck of a time setting them up without the script (spent 15+ hours), and I hate running scripts without understanding what they are doing. I prefer Apache because I need the .htaccess support, I run WordPress websites, and I like the configs/virtual host setup. Plus, with a 512mb box, I feel that I should be able to handle Apache.
I need help optimizing my server. If you need to see any of my configs let me know, i'll gladly upload it to pastebin. Oh, and I also have APC installed and no WP cache plugins installed.
I am testing my site with blitz.io. Right now my server can only handle 40ish users when aimed at the homepage of my WP site >>> https://www.blitz.io/report/65ba0ec5762aa86f17185bfda7065f91 and 240+users when aimed at a static site.
https://www.blitz.io/report/65ba0ec5762aa86f17185bfda725d5ca
I've hired two sysadmins and they don't know what to do.
Comments
Okay,
so apache won't be of much help to you as it can only handle ~125 concurrent connection by default and you really shouldn't push it more then that.
Nginx is a far better solution, and you could just put it in front for caching mode, or install varnish.
I also suggest you install "quick Cache" for wordpress.
I run nginx for my wordpress installs on Nginx with no issue:
http://www.gaming-servers.net/
http://www.lowendhelp.com/
what do you mean Apache can only handle 125 concurrent connections? What about big websites running apache?
Anyway, thanks for the tips. I just hate all of the junk in the nginx configs with php-fpm and such.
Question: Suggestions for most updated lowendscript?
Update: Wow! The Quick Cache plugin helped a ton! Thanks man. I was taught to not rely on those kinds of plugins, but it really helps! I handled 250+users a second!
Did you ever try W3 Total Cache plugin? By enabling Object Cache (APC), Database Cache (APC) and Page Cache (Disk Enhanced) you should be getting some very good performance. To improve Google Page Speed score you need to enable Browser Cache too.
Use jsdelivr for all the css and js files. Their is even a wordpress plugin - http://wordpress.org/extend/plugins/jsdelivr-wordpress-cdn-plugin/
This is a config option you can easily change :-)
Apache can be optimized a lot. The defaults are what they are: defaults. Apache can be a beast. It's almost always wise to use the MPM worker and not the prefork module. If you've got Apache 2.4, you can even use the MPM event module, which handles requests similar to nginx (event-driven).
~ the 125 statement is yes the default, but still it is a good number. On my old dedi more then 125 would kill the node.
Also you still probably want to setup a varnish front end. Make the site not only snappy but handles caching much much better.
Thanks everyone for the suggestions!
I have played with the apache configs and used a script to determine my max clients number.
I've been told to stay away from Worker when using WordPress/PHP.
The WordPress plugin looks great, however does it automatically switch out the jquery that WordPress needs without loading it multiple times? In the past I have had lots of issues with loading my own copy of jquery and such. WP wants you to use enqueue to load js.
Just ran Yslow and I got a 96/100! Question: How do I implement expires headers easily with Apache?
Again, thanks for all of the suggestions!
4 = varnish
The worker is actually faster for PHP in my experience. Mostly used in combination with fcgi or fpm, since mod_php is also a resource hog.
Just out of curiosity: where did you read/got told otherwise?
By the way: nice to have some discussions about these kinds optimalizations here!!
@mpkossen who is this directed at?
Document Path: /
Document Length: 24260 bytes
Concurrency Level: 500
Time taken for tests: 5.678 seconds
Complete requests: 10000
Failed requests: 0
Write errors: 0
Total transferred: 246660000 bytes
HTML transferred: 242600000 bytes
Requests per second: 1761.13 [#/sec] (mean)
Time per request: 283.908 [ms] (mean)
Time per request: 0.568 [ms] (mean, across all concurrent requests)
Transfer rate: 42421.94 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 11 30 101.5 14 1037
Processing: 56 182 287.2 102 3703
Waiting: 34 120 238.4 58 2790
Total: 67 211 307.1 128 4423
Percentage of the requests served within a certain time (ms)
50% 128
66% 148
75% 161
80% 169
90% 360
95% 1101
98% 1292
99% 1359
100% 4423 (longest request)
`
That is with nginx, some caching techniques and a few other things
someone fix it so its code C:<
A control panel less 512MB RAM LAMP server can support around 30-40 simultaneous Apache prefork processes serving dynamic pages and associated static content. But that is not the same as 40 users. The number of users will be higher because not all of them will be using the server's resources at the exact same time (some will be reading too).
Unless you are expecting a lot of traffic in a short period of time (bursty traffic) 30-40 processes should be more than enough. For most websites traffic is spread out over many hours.
Another thing, you are correct that prefork MPM is your only option if you want to use mod_php. The reason is that there is question mark about the thread safety of some PHP extensions so it is not safe to run them under worker or event MPM.
In case you are wondering mod_php is definitely the way to go on a single user server. In such a scenario it is actually more secure than PHP running under PHP-FPM or fastcgi and faster. On shared hosting fastcgi/php-fpm is safer.
Anyway if you want further help I can take a look at your server or you can DIY:
http://abdussamad.com/archives/535-Apache-MaxClients.html
http://abdussamad.com/archives/169-Apache-optimization:-KeepAlive-On-or-Off.html
I've been told by various people on irc (DO's channel and Frantech) that php should be run threaded and that WordPress can create memory leaks which prefork can stop.
Edit: I've also gone ahead and uploaded a phpinfo file and my apache2 conf to my keys server for those interested at viewing my current settings.
http://keys.marshallford.me
My main traffic comes from when I submit one of my articles to HackerNews, so I want to be ready for bursts.
I have max clients (which means number of processes right?) set at 20.
if you install varnish then ignore the next bit, but if you don't change keepAlive off to on.
After taking a look at http://tuxlite.com I am really considering scraping my current setup and using the script to install php-fpm and such.
However several people have stated that mod_php is better for single server setup's like the one I have, while both apache and nginx would use php-fpm when I run the tuxlite script.
To be honest, besides setting up the basics of my server (which I can now do much faster now that I understand what I am doing and what it means) I have only really installed wordpress and configured it (plugins and database stuff).
Should I backup my vhosts and trying the script and install vanish with it too? I notice it also uses the event mpm. Is this safe with php/wordpress?
Sorry for such long posts!
i suggest get another cheap vps and play around with it for some configurations
I can boot up a DO instance and pay for it hourly, great idea mate.
for optimizing, i wish to suggest having a cache in front of your apache. like varnish or others. then maybe you dont need wordpress cache plugin
i read redis is also nice and easy to setup
I don't know about the memory leaks (as in: never had them), but prefork is the non-threaded "version" of apache. The worker is the threaded one. I've been running WordPress for over five years on several servers where PHP runs through FastCGI and I've never had any memory issues. I'm just a bit surprised at what people are telling you. Did they cite sources? I'd like to know if this configuration can result in memory leaks.
mod_php is definitely the easiest option and if it doesn't bother you performance-wise, it's definitely not a bad option. Both fastcgi and php-fpm have a more complex setup.
No worries! Yours are not long :-)
My bad, I had that mixed up.
Any opinions on apache 2.2 with the event mpm? I may look into that as an alternative to using the tuxlite script.
Hmmm are you running an older OS version as 2.4.4 is out with a ton of improvements.
http://httpd.apache.org/
Haven't tried it myself, but from what I read, 2.4 has a more stable event MPM than 2.2.
plus better memory use and other nice fixes.
Hmmm, i'll have to upgrade then. Can you add a repo or do you need to install it from source?
Well, upgrading to ubuntu 13.04 from 12.10 works.