I use apache with CentOS VPS hosting for my blog. I only host one blog in this VPS account. I have 1.5GB RAM and I have 7, 500 page preview per day. My page loading time is 2-3 seconds (according to the pingdom tool).
I want to know what is the best performance (faster web page loading) W3 Total cache option for VPS hosting blog. Currently I use Disk to enhance for page cache and database cache for disk.
Upon reading http://www.theregister.co.uk/2008/08...sky_black_hat/ it appears those who use network address translation may be vulnerable to DNS cache poisoning even after patching their DNS servers.
"another 15 per cent are still vulnerable to some extent because they use network address translation gear that prevents the patch from working."
it took me one year to develop the disk cache tool which can dramatically boost your host and save your harddisk. it is like supercache,but more cheap and better speed.
check picture to see what it can do.
i will offer free download to test the tool by first 10 people. if u host huge traffic website, do not hesitate to try it. i already test it for half a year. it is time to publish it. pm me or post here to get free download.
I just migrate my server into IWeb, the server working great and in reasonable price but the problem is this server give me some funny problem. Anyone can help?
Basically I am in Singapore. My Website which suppose to show english content somehow become mass question mark as below. I am Sure that its not coding problem or Encoding problem since last time it can working fine (it happen only after I migrate the server from layeredtech into here)
But the content will show correctly if you open from US IP or other proxy server. I try in many computer here , some computer show error as I have. So its not computer problem as well since many computer see same error.
It will working fine again after I download and reupload the file but it will back again after 2 weeks.
Is it anything wrong with my server? or dns server setting? why only shown the problem from singapore-malaysia and indonesia side?
Some people say it because error on my DNS ISP , but I dont think so since many people in those country see the same thing. Any idea what should I do?
I guess I have finally seen the adverse effects of raising the conntrack table max too high.
May 15 09:13:52 cp4 kernel: [6430723.486626] dst cache overflow May 15 09:13:52 cp4 kernel: [6430723.622616] dst cache overflow May 15 09:13:56 cp4 kernel: [6430727.562862] dst cache overflow May 15 09:13:56 cp4 kernel: [6430727.698868] dst cache overflow May 15 09:13:56 cp4 kernel: [6430727.844221] dst cache overflow May 15 09:13:56 cp4 kernel: [6430727.991276] dst cache overflow May 15 09:13:56 cp4 kernel: [6430728.131962] dst cache overflow
I got tons of these during an attack today. I have googled around for a lil while and not have been able to find any useful info on raising this cache level up. Would anyone here know how to do this?
I see no sysctl settings or anything of that nature for it.
I'm running shared hosting and would like to keep the amount kept in cache down so that there is always more memory free... how would i go about doing that?
I seem to have the opposite problem of what most people complain about... I'm using some custom-built PHP scripts, the output of which is not getting cached. I want the output cached, because it doesn't change often.
If it's relevant, I'm using ob_start() to serve up a GZIP-compressed page.
I start off with a header("Cache-Control: maxage=3600, must-revalidate"). Yes, it's first, and yes, it's showing up properly in the browser.
However, requesting the page again returns an HTTP 200, not the 304 I'm expecting. It's pulling down the whole page again. It's not changing in between requests, and I'm simply visiting the URL again, not hitting Refresh. (Although it really shouldn't matter.)
I made changes in httpd.conf to redirect website to another website; after 15min I removed redirect but until now when client request website they are redirecting. I'm sure I remove redirect.
we are locating in UAE, UAE has transparent proxy for all Internet connections so I think the problem in proxy cache, How i can confirm it? then can I avoid it ?
also when I put dot "." at the end of link site working without redirect otherwise it's not working.
I'm assuming a corporate proxy cache is what they have set up. I have a client and every time I send them changes to a temporary page I'm hosting for review they can't see it.
They can hit refresh over and over but never see the new updates unless I change the name of the folder its in.
This is very annoying and it only happens with them and one other corporate client i have. They check on multiple computers and it will never refresh and load the new changes. I think this is their network cache that their IT dept. set up.
How can I get around this? I tried an htaccess trick I looked up for expiring files but it didnt work.
These files are on a shared hosting of mine on an Apache server.
root@host# free total used free shared buffers cached Mem: 4016936 2598976 1417960 0 138424 1558652 -/+ buffers/cache: 901900 3115036 Swap: 5275640 0 5275640 Eventually, the cache reaches 2600000 and i would like to keep the cache smaller so that the free RAM is always steady around 500k for when a lot of traffic comes through.
We just upgraded our server with 8 brand new seagate cheetah 15k.5's, a battery backup unit, and a 256mb dimm for the raid controller. In the boot process, i noticed an error about caching or something.
After analyzing the dmesg log, i found the error: sda: asking for cache data failed sda: assuming drive cache: write through
It seems like the kernel can't get to the raid controllers cache, so it switches to the write through setting.
I've benchmarked the harddisks with the write through, and write back setting. The odd thing is that both settings deliver the same performance.
Normally, write back increases the performance with like 100%... That's why we bought the battery backup unit.
So something is going wrong, but where lays the problem?
Server:
Quote:
8 X seagate cheetah 15k.5, U320, 16mb cache, SCA, 73GB 1 X chenbro backplane, U320, SCA, 2 channels, 8 ports 1 X LSI megaraid 320-2x raid controller, U320, 2 channels, battery pack and 256 upgraded dimm 6 GB DDR PC3200, ECC, CL3 2 X AMD opteron dual cores (4 X 2.0 ghz)
I have Django (python framework) on a server, and I have a little problem. The application is kept in cache by FastCGI
When you make changes to your application you have to restart it. Touching the file doesn't solve my problem. The only solution I have is renaming the .fcgi file always, and if you use an orifinal file name, it actually works like before, prooving it's kept in cache.
What would you do? A cron job to remove these files maybe?
I've got an application (java web ) tha dynamically creats images ( with dynamic url - ...tab&vi=nia&h=24&ds=bottom&fn...) - like thumbnails,icons ect.
The think I'm trying to deal with is to force caching theese images by a browser.
When the application starts the server gets images and shows code 200 ( and this images apppers in web browser cache), but after reloding or simply viewing the images from the cache url the server shows again code 200. I'd like to have code 304 - not modified - like when browser gets an image from cache.
The dynamic url for image is being created only once - when the appication starts, and after that it stays unchanged, but I still can't force use the cached images - like when it is a static url - .../image.jpg.
What is the good value to set query_cache_size. I have set it to 60 M and here is the status. Is it good? I am not sure how to check this? Can anyone explain?
query_cache_size=60M
mysql> SHOW STATUS LIKE 'Qcache%'; +-------------------------+----------+ | Variable_name | Value | +-------------------------+----------+ | Qcache_free_blocks | 5 | | Qcache_free_memory | 62666440 | | Qcache_hits | 922 | | Qcache_inserts | 381 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 565 | | Qcache_queries_in_cache | 182 | | Qcache_total_blocks | 400 | +-------------------------+----------+ 8 rows in set (0.00 sec)
I am currently wanting to add a cache engine that eases the apache server for my php scripts. I just wanted to make sure there weren't cons; bugs with certain pages that need to be reloaded very quickly? Has any of you already experienced such bugs with these progs? Which cache-accelerator would you suggest for php-mysql apache?
Since I got my server its ran with 1gb ram and has kept a free of at least 400mb since that time.
Now withing a few hours all of it is being kept in buffer/cache as the past week an showing about 15mb free (not counting buffer/cache) and has started in on the disk swap of about 400Kb.
So should I upgrade to 2gb now or wait till it goes deeper into the swap, and if so how far into the swap before you'd upgrade?
Could someone please help me with some information on how I can troubleshoot this issue?
[warn-phpd] mmap cache can't open /home/sitedir/)
It's happening on all the directories ie: sites on the server. Switching from phpsuexe back to running php dso fixes the issue, but how can I run phpsuexec and fix this problem? Any tips would be very much appreciated.
I'm sure all of you who use eaccelerator know how big the cache can get and that it needs emptied manually. Well at least to my knowledge it does, the only thing I have seen that you can configure is the shm pruning. If anyone does know such a feature with eaccelerator please share. But I also notice a performance decrease and a few php errors mostly related to memory allocations here and there.
Anyway I was piddling around and came up with a command to disable eaccelerator from php.ini, delete the cache folder and then enable it back. I figured this would be good as a daily cron. I would like some input if anyone knows any better ways.
So I wanted to share this in case someone else here has the same problems with eaccelerator cache folder getting huge. If anyone knows a way to make this better or shorter please reply with solution.
Of course this will vary depending on where your php.ini is and where your eaccelerator cache is. Just replace those values with yours. I'm sure there is also a way to use similar commands to find and input these values, again if anyone knows please share.
