Server Cache

Oct 1, 2009

I have reseller account from small web service company.

they are great and better than the famous company.

but I have one problem. I have personal blog, some time I don't see the new comment, also my visitor see the comment before 4 days ago only.

and there is vb forum, some times new member can't login and only you see the old topic, and some times you see everything ok and up to date.

me and all my visitor have the same problem and that can't be from internet service provider because they are from several country.

I had such problem before 4 years and it was because server Cache.

I didn't name the company because they are great and I don't want to blame them before I know certainly what cause the problem.

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Apache :: Use Disk To Enhance For Page Cache And Database Cache For Disk

Apr 24, 2013

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.

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Eating Cache Memory, Then Server Crash

Dec 3, 2007

My RAM is 2G.

The cache memory of my server is eating, After 2 weeks, the cache memory is below 1G, then the server crashed.

After I reboot the machine, the cache memory back to normal. But it starts to eating again.

I have attached the graph.

I am using lighttpd, php, mysql

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Are Patched Domain Name Server (DNS) Behind N.A.T. Still Vunlerable To DNS Cache Poisoning?

Aug 7, 2008

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."

Thoughts?

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Dramatically Increase Your Performance Of Web Server By Disk Cache

Jun 22, 2009

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 open to any opinion about the tool.

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Domain Name Server (DNS) Cache Problem? Or Server Problem?

Jun 26, 2008

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?

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DNS Cache

Apr 17, 2009

I have moved my domain out of hostgator like a month ago..

[url]

The whois shows my new nameservers and IP

Why is my page being redirected to hostgator suspended page.

My domain is not even registered with them

the domain is nuzil.com

any reviews about that.

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Cpu Cache?

Apr 28, 2008

the NOCONA and IRWINDALE are old cpu,

i find the main difference of them is L2 cache (1MA2M),

i want to ask what service need more L2 cache?

for example:a lot of db usage? or httpd? or?

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Dst Cache Overflow

May 17, 2009

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.

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Page Cache

Jul 25, 2009

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?

are these values good?

echo 20 > /proc/sys/vm/dirty_background_ratio

echo 60 > /proc/sys/vm/dirty_ratio

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DNS Cache Poisoning

Mar 19, 2008

What tools do you use to check for DNS Cache Poisoning ? Is there any way it can be prevented and is the problem very prevalent?

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PHP And Cache-Control

Jan 27, 2008

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.)

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Mysql Cache On A Vps

Apr 22, 2007

[url]

has an article on mysql query cache.
It notes that in the mysql config file, having

query-cache-type = 1

sets the mysql query cache.

In mysql I note that

SHOW VARIABLES LIKE '%query_cache%';

outputs

+-------------------+---------+
| Variable_name | Value |
+-------------------+---------+
| have_query_cache | YES |

which indicates that cache is set, but...

find . -name "my.cnf"

./usr/local/cpanel/whostmgr/my.cnf
./etc/my.cnf

shows only these

set-variable = max_connections=500
safe-show-database

So where has query cache been set?

At the server level?

If so, am I able to set the query_cache_size and if so, which path?

Anyone have any comments on their mysql optimization on a VPS?

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DNS/Proxy Cache

Jul 15, 2007

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.

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Query Cache Denied

Jun 29, 2009

what does this mean? its been flooding /var/log/messages

Jun 28 08:12:50 host named[7649]: client 209.86.63.238#9427: query (cache) 'root.domain.tld/A/IN' denied
Jun 28 08:12:50 host named[7649]: client 209.86.63.230#42462: query (cache) 'root.domain.tld/A/IN' denied
Jun 28 08:12:50 host named[7649]: client 200.23.242.203#37863: query (cache) 'root.domain.tld/A/IN' denied
Jun 28 08:12:50 host named[7649]: client 212.93.151.237#8080: query (cache) 'root.domain.tld/A/IN' denied
Jun 28 08:12:50 host named[7649]: client 212.202.215.18#35119: query (cache) 'root.domain.tld/A/IN' denied
Jun 28 08:12:50 host named[7649]: client 212.93.151.237#40106: query (cache) 'root.domain.tld/A/IN' denied
Jun 28 08:12:50 host named[7649]: client 209.86.63.231#51272: query (cache) 'root.domain.tld/A/IN' denied

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Getting Around A Corporate Proxy Cache

Oct 7, 2009

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.

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Edit Linux Cache

Jul 5, 2009

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.

is there a way to clear the old cache out faster?

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EAccerlator And Cache Dir/RamDisk

Jul 9, 2009

How do I setup a RamDisk or a tmpfs mount? I want to setup cache_dir in memory.

My current settings:

extension="eaccelerator.so"
eaccelerator.shm_size="128"
eaccelerator.cache_dir="/tmp/eac"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="7200"
eaccelerator.shm_prune_period="3600"
eaccelerator.shm_only="1"
eaccelerator.compress="1"
eaccelerator.compress_level="9"
eaccelerator.keys="shm_only"
eaccelerator.sessions="shm_only"
eaccelerator.content="shm_only"

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Core2Duo E2180 Vs P4 3.0Gz, 2MB Cache

Apr 20, 2008

Which would you choose:

Core2Duo E2180, 1MB Cache
P4 3.0Ghz, 2MB Cache

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A Few Words About DNS Cache Poisoning

Nov 26, 2007

What is your opinioun on the subject?

How could it be done?

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Sda: For Cache Data Failed

Aug 11, 2007

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)

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Dispatch.fcgi Kept In Cache

May 21, 2007

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?

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Flush Cache On CentOS

Jun 15, 2007

How do I flush the cache on CentOS cache and Buffer or either one.

on top command I see a lot of ram in cache and I want to flush the cache.

How do I do that? any kommands?

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EAccelerator Cache Size

Feb 1, 2007

how big I should set the cache size for eaccelerator?

Here's the information from the control.php

Caching enabled yes
Optimizer enabled yes
Memory usage 100.00% (16.00MB/ 16.00MB)
Free memory 0.00MB
Cached scripts 148
Removed scripts 0
Cached keys 0

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Cache The Dynamic Url (images)

Oct 3, 2007

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.

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Mysql And Query Cache

Jan 4, 2007

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)

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PHP Accelerators (cache) CONS

May 2, 2007

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?

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When To Add More Ram. Swap/Cache/Buffer

May 23, 2007

When is a good time to add more ram?

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?

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How To Troubleshoot Mmap Cache Problems

Jun 24, 2008

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.

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Eaccelerator Cache Emptying Cron

Apr 9, 2009

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.

Code:
find /usr/local/lib -name 'php.ini' | xargs perl -pi -e 's/extension="eaccelerator.so"/;extension="eaccelerator.so"/g' ; rm -rf /usr/lib/php/eacc ; mkdir /usr/lib/php/eacc ; chmod 4777 /usr/lib/php/eacc ; find /usr/local/lib -name 'php.ini' | xargs perl -pi -e 's/;extension="eaccelerator.so"/extension="eaccelerator.so"/g'

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