I have the impression that I am being affected from a kind of DDOS or email worm attack. Is there a way I can track the sources of the connections?
The control panel I am using is Plesk 8.2 on Linux CentOS 4.2
Our web server encounter a problem lately, that an IP address in India repetitively sent requests that uses up all connections available in Apache. All connections appear to be in W state. The connections are not terminated by Apache even though timeout has been set to lower 30 seconds. Similarly, MySQL connections also are not dropped until Apache is restarted.
View 7 Replies View RelatedI just received an email saying
We were forced to suspend your account due to excessive apache connections causing ftp to go down. Here is a snapshot of the activity:
242-0 22189 0/57/57 W 1.24 10 0 0.0 0.09 0.09 xxxxxx xxxxxx.com
243-0 22194 0/1/1 W 0.01 0 0 0.0 0.00 0.00 xxxxxxx xxxxxx.com GET
244-0 22214 0/4/4 W 0.15 4 0 0.0 0.03 0.03 xxxxxx xxxxx.com GET
And when I was on the phone with the support, they told me my site had opened up 400 apache connections + using the GET command and was causing FTP slow downs.
It just happens so that a file I posted made its way to a popular forum and all the sudden, everyone was downloading the file.
What is the best way to correct this problem? and GET? Isn't that a FTP Command? but people were downloading via [url]
I keep getting emails from LFD saying this user is using to many resources and it is because of their shoutcast is their a way to take care of this problem?
View 0 Replies View RelatedResource: Virtual Memory Size
Exceeded: 149 > 100 (MB)
Executable: /usr/bin/php
I've been receiving e-mails about this. May I know how to fix this?
I'm having a problem that I've never run across before, and was wondering if anyone might have any ideas as to what may be causing this.
Basically, on 3 of 5 new servers on a brand new private rack from The Planet, we're having what we've narrowed down to be a problem with PHP or Apache. Loading any sort of PHP page with a larger output (even such as a simple 'phpinfo' call) results in, depending on the computer or browser in use:
- The page loading for a split second then reverting to a DNS Server Not Found page (observed in IE)
- The page loading, but filling the source code with vast amounts of extra blank spaces, making a simple phpinfo call download 5+mb of HTML (observed in both IE and Firefox)
- The page loading part way, then hanging (observed in Firefox)
- Occasionally the page will reload over and over again all by itself until it ultimately goes to a DNS error page (observed in IE)
Pages not including PHP, including very long .HTML and .SHTML pages, load just fine.
Here's a link to a page calling a simple phpinfo string, and nothing else (as this is my first post, I can't link directly to URLs, sorry):
Excessive resource usage: dbus (2015)
I get below alarm from lfd
Quote:
Time: Sun Sep 28 12:16:06 2008 +0200
Account: dbus
Resource: Process Time
Exceeded: 134303 > 1800 (seconds)
Executable: /bin/dbus-daemon
The file system shows that this executable file that the process is running has been deleted. This typically happens if the original file has been replaced by a new file when the application is updated. To prevent this being reported again, restart the process that runs this excecutable file.
Command Line: dbus-daemon --system
PID: 2015
Killed: No
How can I find which process runs this excecutable file ?
What was causing this:
I installed a url shortner script but the link that the script creates takes you to a server error page.
I viewed the logs and I get this error over and over again.
Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.
this is what is in my htaccess file
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule ^(.+)$ index.php?url=$1 [QSA,L]
I fixed that there is a process that loads the server and much why it does not.
Name process: md2_resync
Mountain View (CA) - As a company with one of the world's largest IT infrastructures, Google has an opportunity to do more than just search the Internet. From time to time, the company publishes the results of internal research. The most recent project one is sure to spark interest in exploring how and under what circumstances hard drives work - or not.
There is a rule of thumb for replacing hard drives, which taught customers to move data from one drive to another at least every five years. But especially the mechanical nature of hard drives makes these mass storage devices prone to error and some drives may fail and die long before that five-year-mark is reached. Traditionally, extreme environmental conditions are cited as the main reasons for hard drive failure, extreme temperatures and excessive activity being the most prominent ones.
A Google study presented at the currently held Conference on File and Storage Technologies questions these traditional failure explanations and concludes that there are many more factors impacting the life expectancy of a hard drive and that failure predictions are much more complex than previously thought. What makes this study interesting is the fact that Google's server infrastructure is estimated to exceed a number of 450,000 fairly mainstream systems that, in a large number, use consumer-grade devices with capacities ranging from 80 to 400 GB in capacity. According to the company, the project covered "more than 100,000" drives that were put into production in or after 2001. The drives ran at a platter rotation speed of 5400 and 7200 rpm, came from "many of the largest disk drive manufacturers and from at least nine different models."
Google said that it is collecting "vital information" about all of its systems every few minutes and stores the data for further analysis. For example, this information includes environmental factors (such as temperatures), activity levels and SMART parameters (Self-Monitoring Analysis and Reporting Technology) that are commonly considered to be good indicators to describe the health of disk drives.
In general, Google's hard drive population saw a failure rate that was increasing with the age of the drive. Within the group of hard drives up to one year old, 1.7% of the devices had to be replaced due to failure. The rate jumps to 8% in year 2 and 8.6% in year 3. The failure rate levels out thereafter, but Google believes that the reliability of drives older than 4 years is influenced more by "the particular models in that vintage than by disk drive aging effects."
Breaking out different levels of utilization, the Google study shows an interesting result. Only drives with an age of six months or younger show a decidedly higher probability of failure when put into a high activity environment. Once the drive survives its first months, the probability of failure due to high usage decreases in year 1, 2, 3 and 4 - and increases significantly in year 5. Google's temperature research found an equally surprising result: "Failures do not increase when the average temperature increases. In fact, there is a clear trend showing that lower temperatures are associated with higher failure rates. Only at very high temperatures is there a slight reversal of this trend," the authors of the study found.
In contrast the company discovered that certain SMART parameters apparently do have an effect drive failures. For example, drives typically scan the disk surface in the background and report errors as they discover them. Significant scan errors can hint to surface errors and Google reports that fewer than 2% of its drives show scan errors. However, drives with scan errors turned out to be ten times more likely to fail than drives without scan errors. About 70% of Google's drives with scan errors survived the first eight months after the first scan error was reported.
Similarly, reallocation counts, a number that results from the remapping of faulty sectors to a new physical sector, can have a dramatic impact on a hard drive's life: Google said that drives with one or more reallocations fail more often than those with none. The observed average impact on the average fail rate came in at a factor of 3-6, while about 85% of the drives survive past eight months after the first reallocation.
Google discovered similar effects on hard drives in other SMART categories, but them bottom line revealed that 56% of all failed drives had no count in either one of these categories - which means that more than half of all failed drives were put out of operation by factors other than scan errors, reallocation count, offline reallocation and probational counts.
In the end, Google's research does not solve the problem of predicting when hard drives are likely to fail. However, it shows that temperature and high usage alone are not responsible for failures by default. Also, the researcher pointed towards a trend they call "infant mortality phase" - a time frame early in a hard drive's life that shows increased probabilities of failure under certain circumstances. The report lacks a clear cut conclusion, but the authors indicate that there is no promising approach at this time than can predict failures of hard drives: "Powerful predictive models need to make use of signals beyond those provided by SMART."
I cant decide between
Dual Processor Single Core
Dual Processor Single Core Xeon - 3.00GHz (Irwindale)
Or
Single Processor - Quad Core?
Single Processor Quad Core Xeon 3220 - 2.40GHz (Kentsfield)
My site needs "raw" processing power due to the applications it runs. ram (over 2 gb) and hdd are not that important to me.
could someone point me in the right direction.
An old friend of mine wanted to get a vps so I made one from a dedicated and gave it to him. The only thing he has done is made it so the only ip allowed to connect to ssh is his. what are the pros and cons of hacking.exploiting with this.
View 2 Replies View Relateddoes anybody know a company for a cheaper ded. server (unmanaged) who will accept also a IP net (min. /24) within a BGP4 connection instead of single expensive IPs ? I know some in Europe who will do it for additional costs but often the server are too expensive.
View 12 Replies View RelatedMy website has been under a constant Syn Flood DoS attack for the past few days. However, the attack originates from a single IP address that changes every few hours (Possibly a syn flood script with IP spoofing capabilities).
The Syn Flood attack isn't creating any spike whatsoever in my usage graphs, however, its still rather annoying. What firewall should I use to combat the DoS attack?
how to set 2 name servers with a single IP address via cPanel?
View 10 Replies View RelatedI have purchased a VPS and setup all my apache, php and mysql successfully.
However I am unable to understand over how can I point [url] (bought at Godaddy) to my VPS host.
I only have a single dedicated IP address for me. So it makes more challenging on how can I host DNS on my VPS only.
I have three sites running on three separate servers behind a single router with DDWRT. One of the servers is a Windows 2003 server that I have DNS running on.
Each domain name points to my public static IP address.
My router is set to use the windows 2003 server as the DNS server.
I have port 80 forwarding to the windows 2003 server.
I can access the sharepoint site that is on the 2003 server from outside my network and within it without any problems.
When I try to access one of the other two sites from outside the network, i get a 400 error. When I try to access the same sites from within the network, they work fine.
how to reset a password via a single line command? Or script? To make it automated?
View 14 Replies View RelatedI have a Linux(RHEL5) dedicated server.Tomcat version 5.x is running integrated with Apache and now i want to install tomcat 6.x integrate with apache without effecting older tomcat version. it will run as it is.
How can i do this and if yes then how can i set tomcat home path for both versions.
CATALINA_HOME=<Which path for both> and how to install it.
if it is better to host two related websites on single host or on separate servers?
currently we are hosting three related websites on 3 separate webhosts. one in US, another in UK & another in Nepal. can anyone please explain if is it better to use single webhost?
is there any sort of ssl certificate that will 'secure' any domain, hosted on a single server?
For example, I have the following domains and subdomains:
google.com
test.google.com
mywebsite.com
hello.example.com
All will be hosted on the same server (same IP) and I want all to be secured, through a SIGNED certificate, not a self signed. I assumed that wildcard ssl would be fine for this, but I just took a look and it's only for subdomains: example.example.com hello.example.com.
Is there any way of having every subdomain and domain secured, using ssl, through one certificate? I don't want to have to buy individual certificates for every domain, that'd be... expensive.
We have a few single CPU (54xx quad core)systems running Hyper-V and looking at the Hyper-V Logical Processer Total value in Perfmon its staying pretty much from 85% to 100% all day long. Perfomance is mostly ok with an occasional hesitation, but the biggest reason is we are trying to avoid doubling the cost of SPLA license by not adding the second CPU. Most motherboards we have only hold 16 gig to 24 gig memory and by adding a second CPU both will probably be less then 40% or 50%
Any problems keeping a 54xx or any CPU for that matter running flat out as long as its cooled OK?
how to set the restrictions of maximum recipients a singe email can be sent to. I found one customer sending an email to 1233 recipients at a time which is a large number enough to increase the queue on the server. I am running Cpanel/WHM. Is there some tweak to be done in Exim?
View 6 Replies View RelatedWhat is the best configuration for a dedicated server? Trying to get my head round all the terminology as fast as I can.
Multi Processor Single Core
or
Single Processor Multi Core
Based on todays equipement I know a person can spend Thousands on a good server, I'm looking to build my own and just want some advice on which way to go.
I'm thinking of just building the server pc in one case and the hard drive setup will be in a seperate case with the following:
3ware 9690SA-8E controller
Mass-Storage 8x by A-Tech Fabrication for a case
8 - SATA2 SEAGATE 1TB (7200rpm) 32MB on the controller as RAID
Can anyone give advice on what would be a good setup if you were running 1 single server for local businesses. I don't want to hear just pay for a provider as I've heard that one before now I'm looking to know what hardware setup you would run I like to play and learn. Even though sometimes the headache playing isn't as much fun as we sometimes may have hoped.
What are m/b and processor options for running a server?
What is min. amount of ram a person should run using linux and cpanel?
Should linux be on a max. amount of space for root and server files on a seperate mnt?
What connection up/down would be min. for usage of about 5gig/month?
This is kind of a followup of our thread
"More RAM or better CPU?" [url].
Sorry if we were supposed to post in that thread in stead, but this is a different question that in that post.
Our server is still crashing a lot and unfortunately we can't afford a multi processor with multi cores.
So the question is as follows:
For a site with a lot of database activity, what would be the best thing to go for:
a) Single processor with multiple cores, or
b) Multiple processors with a single core.
a = Intel Xeon 3060 Dual Core Conroe Processor (2.4GHz)
b = 2x Intel Dual Xeon 2.8GHz Processors
i got my server. I'm still shopping for hard disks but the server is pretty much there.
i'm in Houston, Texas. i'll like to know if anyone can give me tips on what to look for in colo. what question should i ask or be aware of.
my budget is $100 per month. i don't use much bandwidth and it doesn't have to be premium bandwidth with basic service.
I'm a web developer for an educational institution. We have a site that over 300 students must access each semester. Our site is hosted by a popular shared hosting provider. Our site is accessible to everyone BUT several students living in a particular dorm on our campus. The dorm has a different internet service provider than the rest of the school, so the site IS accessible on the rest of campus.
The dorm ISP insists they have no firewalls blocking any sites including ours. Indeed, the students confirm they have never had a problem accessing any other sites. Our webhost ran some tests and said they do not have a firewall up against the dorm's IP address therefore the problem must be on the dorm's end. Indeed, no one else has problem accessing the site except for these dorm students. Both companies are claiming it must be on the other's end and neither are willing to look into it further.
Some additional tidbits. The site was hosted on a Mac G5 dedicated server in our department in the past and students never complained about access issues. However, that was in our beta phase and less students were accessing the site.
We had one of the students in the building run some ping commands and a tracert. The general ping and tracert commands appeared to indicate the site was working. However, when the student tried various specific ports, the command got stuck on: "connecting to ..." where the dots were our website.
This test seemed to affirm to the server company that the problem was at the ISP level. Again, the ISP insists the problem is not theirs.
My main question is, does anyone know what on earth could be happening and on what end this problem may be on?