Flush Cache On CentOS
Jun 15, 2007How 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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Mysql: Schedule Flush Query Cache
Dec 5, 2007I want to run flush query cache, saying once a week. Is there anyway to schedule it, so system can do it automatically? Currently, I have to login server, and run it manually
View 1 Replies View RelatedVirtuozzo Centos 64-bit Vps Not Using Any Ram For Buffers Or Cache
Apr 25, 2009I have a virtuozzo vps account 64-bit centos running whm/cpanel.
I've been having an issue with high load average at times while very little cpu is being used and there is plenty of ram free, and in looking into this, I've run into another thing that seems very odd to me:
free
total used free shared buffers cached
Mem: 786432 179944 606488 0 0 0
-/+ buffers/cache: 179944 606488
top - 22:29:52 up 15:30, 1 user, load average: 1.23, 1.55, 1.12
Tasks: 74 total, 1 running, 72 sleeping, 0 stopped, 1 zombie
Cpu(s): 0.0%us, 0.1%sy, 0.0%ni, 88.8%id, 11.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 786432k total, 174784k used, 611648k free, 0k buffers
Swap: 0k total, 0k used, 0k free, 0k cached
uname -r
2.6.18-028stab060.8
No memory being used for buffers or cache.
why no ram is being used to buffer/cache slower disk io?
Apache :: Use Disk To Enhance For Page Cache And Database Cache For Disk
Apr 24, 2013I 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.
Flush CSF (csf.deny)
May 15, 2008How can flush csf blocked ips? (csf.deny)
View 4 Replies View RelatedI Have To Flush Iptables On Every Reboot
Jun 27, 2007I'm running CentOS 4.4 32 bit.
At the moment every time I reboot my server I have to execute:
# iptables --flush
# iptables --zero
just to be able to access the server. (Though it does allow SSH to access before executing those).
And I figured out that I must do something to /etc/sysconfig/iptables to permanently be able to access the server without those commands after reboot. Right?
Below is the file's contents:
# Firewall configuration written by system-config-securitylevel
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT
What do I need to do?
Flush CPHulk Database
Apr 25, 2009do you know how to flush out Flush cPHulk Database weekly? I dont know how i can set up a cron for that. this is because the expiration of brute force lasts for 2 weeks which is too long for the clients
View 3 Replies View RelatedFailed To Flush Buffer
May 28, 2008I'm getting this on my VPS:
Notice: ob_flush() [ref.outcontrol]: failed to flush buffer. No buffer to flush. in /home/.../download_ip.php on line 215
What is causing this? Memory Limit in PHP? or something else?
Run Iptables --flush And Down Server
Aug 15, 2007i run iptables --flush my server go to full down and must go to restart
View 6 Replies View RelatedAfter Flush+zero Iptables, Will A New Iptables Ban Work
Jan 5, 2008I execute the following commands, in the following order:
iptables --flush
iptables --zero
iptables -A INPUT -s 218.65.12.161 -j DROP
will that last command successfully ban that IP until reboot?
If not, what needs to be done? I can't access my site if I don't flush + zero iptables first but I need to be able to ban with iptables.
DNS Cache
Apr 17, 2009I 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.
Cpu Cache?
Apr 28, 2008the 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?
Dst Cache Overflow
May 17, 2009I 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.
Page Cache
Jul 25, 2009I'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
Server Cache
Oct 1, 2009I 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.
DNS Cache Poisoning
Mar 19, 2008What tools do you use to check for DNS Cache Poisoning ? Is there any way it can be prevented and is the problem very prevalent?
View 1 Replies View RelatedPHP And Cache-Control
Jan 27, 2008I 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.)
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?
DNS/Proxy Cache
Jul 15, 2007I 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.
Query Cache Denied
Jun 29, 2009what 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
Getting Around A Corporate Proxy Cache
Oct 7, 2009I'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.
Edit Linux Cache
Jul 5, 2009root@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?
EAccerlator And Cache Dir/RamDisk
Jul 9, 2009How 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"
Core2Duo E2180 Vs P4 3.0Gz, 2MB Cache
Apr 20, 2008Which would you choose:
Core2Duo E2180, 1MB Cache
P4 3.0Ghz, 2MB Cache
A Few Words About DNS Cache Poisoning
Nov 26, 2007What is your opinioun on the subject?
How could it be done?
Sda: For Cache Data Failed
Aug 11, 2007We 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)
Dispatch.fcgi Kept In Cache
May 21, 2007I 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?
EAccelerator Cache Size
Feb 1, 2007how 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
Cache The Dynamic Url (images)
Oct 3, 2007I'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.
Mysql And Query Cache
Jan 4, 2007What 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)