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• Identify malicious subnet

  - by Macros

  I have been experiencing performance issues on a website for a while, and it always seems to hit around the same time. Having analysed the logs I've found a big spike in requests which corresponds with this slowdown, with all requests coming from the same subnet. It feels to me like an attempt to scrape the site (it is a car hire site and the requests are sequential for each IP and with incremental search criteria) and I would like to identify the source. The Subnet in question is 209.67.89.x which I can see is owned by Savvis however I can't reverse DNS any of the IPs - is there any other way I can gain more info on this (other than contacting them direct - I am also doing this)?

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• Prevent specific applications from being run as administrator

  - by Unsigned

  Background Most installation toolkits have the ability to launch, automatically or otherwise, external programs after installation. This is often appears in the installer via such options as "Show readme", or "Start program". Issue The problem is, many of these installers are poorly coded, and do not drop permissions appropriately. For example, starting the application automatically, or opening the application's homepage in the browser, often results in launching the application or browser with the installer's Administrative privileges, or a "High" UAC integrity level! This has the potential to open up security breaches, by opening up the installed application, or a web page (and possibly browser add-ons), that are now running with elevated permissions. (This is the reason I strongly recommend never choosing auto-launch options when installing software.) Question The question is: Is there a way to prevent certain applications (such as a web browser) from ever being launched with Administrative privileges, i.e., an automatic drop-privilege?

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• Good Choice of Memory for Asus K52F-BBR5

  - by Christopher Painter

  I recently purchased an Asus K52F-BBR5 notebook. It's a basic laptop with an Intel P6100 CPU and Mobile Intel® HM55 Express Chipset. It came with 3GB of DDR3 SODIMM memory and I'd like to expand it to 8GB. I'm a little confused by DDR3 nomenclature and not up to date on my knowledge of chipsets. I'd like to make a good choice when selecting memory for it. Crucial's database suggests using either a PC3-8500 with CAS 7 or a PC3-10600 with a CAS of 9. Is the 8500 better because of it's CAS 7 or will my chipset run the memory async at a higher speed and get better performance? Which would be a better choice for my chipset and CPU? Price difference is negligble.

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• Everything You Ever Wanted to Know about Mod_Rewrite Rules but Were Afraid to Ask?

  - by Kyle Brandt

  How can I become an expert at writing mod_rewrite rules? What is the fundamental format and structure of mod_rewrite rules? What form/flavor of regular expressions do I need to have a solid grasp of? What are the most common mistakes/pitfalls when writing rewrite rules? What is a good method for testing and verifying mod_rewrite rules? Are there SEO or performance implications of mod_rewrite rules I should be aware of? Are there common situations where mod_rewrite might seem like the right tool for the job but isn't? What are some common examples?

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• Boot.ini on Windows Server 2003 R2

  - by Jason H.

  I have a Windows Server 2003 R2 with 48 GB of RAM; server has been running strong for quite some time. Recently our boot.ini was modified causing issues, most likely by our remote administrators. Now the server is only showing 14 GB of RAM. This has caused major performance issues for our end users. Our remote administrators have stated "we don't change the boot.ini settings(switches)". However, I know for a fact that all of the local administrators have not modified the switches (due to lack of permissions). The real question.. Is it possible to "audit" who has modified the boot.ini? If thats not possible, can the boot.ini be set via startup? Any help would be greatly appreciated. This is an ongoing issue that I would love to resolve.

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• mysql server, open 'dead' connections

  - by Jeff

  my basic question is what kind of impact does this have on the server.. lets say for example, there is an older program in my company that opens connections to a mysql database server at a high rate (everything they do with the application basically opens a server connections) however, this application was not designed in the way to dispose of the connections after they where created.. alot of the time the connections remain open but are never used again, open 'dead' connections i guess you could say. they just remain connected until the server times them out, or until an admin goes in and removes the sleeping connections manually. im guessing this could be responsible for sometimes not able to connect errors etc. that we receive from other systems that try to access the mysql database? (connections limit reached) could this slow down the server as well? curious what all this could exactly cause. thanks!

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• Windows 8: 100% disk active time, no actual data transferred

  - by fingerbangpalateclick

  Occasionally, like several times an hour, my hard drive will appear to lock up: Task Manager will show 100% active time with read and write speeds of 0. I can still switch between open windows, but anything that requires a disk access will stall for around a minute until the hard disk starts working properly again. It happens at apparently random intervals, and only happens in Windows 8. Not 7, nor Linux. It is probably not a problem with the disk itself: This is a relatively new hard drive, and S.M.A.R.T. is showing no errors. Only happens in Windows 8: not any other OS that has used the same partition, or different partitions. So, what is going on? How can I fix this? Note: this is a different problem then this one: Extremely high disk activity without any real usage My task manager would look similar, but Average Response Time, Read Speed, and Write Speed would all be 0.

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• Turning a running Linux system into a KVM instance on another machine

  - by Charles

  I have two physical machines that I wish to virtualize. I can not (physically) plug the hard drives from either machine into the new machine that will act as their VM host, so I think that copying the entire structure of the system over using dd is out of the question. How can I best go about migrating these machines from their hardware to the KVM environment? I've set up empty, unformatted LVM logical volumes to host their filesystems, with the understanding that giving the VMs a real partition to work with achieves higher performance than sticking an image on the filesystem. Would I be better off creating new OS installs and rsyncing the differences over? FWIW, the two machines to be VM'd are running CentOS 5, and the host machine is running Ubuntu Server 10.04 for no particularly important reason. I doubt this matters too much, as it's still going to be KVM and libvert that matter.

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• Resize a new database to predicted maximum size

  - by John Oxley

  Currently I have a SQL Server database which is about 2 Gb. I know over the next year it's going to grow to a maximum of about 10Gb. Hard drive space is not an issue in the slightest. Is there a down side to resizing the datafile to 20Gb now, then defragmenting the hard drive? Should I resize the log file to 1Gb as well? Something ridiculously large so that fragmentation doesn't happen there either. With this question I would like to avoid the datafile becoming fragmented on the disk itself, but I don't want to negatively impact performance.

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• I need an other videocard to replace my ATI HD 5870 which one is good? [closed]

  - by Chris

  At this moment I have a ATI HD 5870 iCooler 5 and I game a lot. I want to replace the card for another, I don't have room in my case to add another 5870. I mainly play games like Battlefield 3, but I can't play this game on Ultra high, for me is this pretty important. So here are my questions: Price is not an issue because computers are a big hobby to me and hobbies cost money :-) Can anyone recommend me a better card, ATI or Nvidia does not mather to me. Why is this card better?

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• No Audio Output Device is installed

  - by mabho

  Hi, this is an intermitent problem in my Sony Vaio model PCG-5K1L. I keep on getting a "No Audio Output Device is installed" when hovering my loudspeaker icon in Windows Vista. I have tried System Device Manager Sound Realtek High Definition Album Update Driver Software. The update process went through, but nothing happens. Still Vista does not seem to recognize my audio software. The strange part is that out of nothing my sound card can resume working to stop again hours later... If someone has any clues to solve this, please, help. Thanks a lot.

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• ESXI 4.0 Slow response in opening anything accross the network on a Virtual Server running Win2008

  - by user40944

  Hi I recently installed a HP ML350G6 Server with Windows Small Business Server 200864bit, Exchange 2007. The server was running fantastically and we transferred all user data onto the new server and no problems for 2 weeks! We then installed SQL2008 and transferred the accounts package onto the server and this is where the problems started. Users are now complaining to open a work document can take 2 minutes and the same with regard to anything else. The server itself seems fine, the virtual server seems fine! No disk performance problems (doesn't go above 50% unless i really copy lots of things), no memory, (12Gb only using 7Gb) cpu (usage is low average about 15%) etc on both the VM and in Windows Task manager. I have made sure disk caching is enabled on the raid controller (which made no difference). Network cards are running 1Gb and plugged into HP GB switch. Please help!

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• How many nginx/fastcgi processes do you use?

  - by qliq

  I have a drupal-based website on a VPS with 1GB RAM and 1Ghz processor share. The webserver is nginx along with php-fastcgi. Currently I am using 10 nginx and 13 php-fastcgi processes. The server load is high most of the times while half of the RAM is unused. The CPU usage rarely reaches 80%. I have tried some other combinations of nginx/php-fastcgi but am not sure what is the optimal combination because I am quite ignorant about what's going on below the surface. So I appreciate if you could share your experience or give me some clues.

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• Looking for an open source real-time network analysis program

  - by JrSysAdmin

  Can somebody recommend an open source real-time network analysis program? What I'm looking for the program to do is display a graph of bandwidth usage by IP within our internal network that can quickly be viewed any time we need to (typically when we want to quickly find out who is utilizing high amounts of bandwidth and slowing down the network). We ideally simply want to hook up a monitor on the wall of our server room to a system whose NIC will be in permissive mode to log all network activity in a visual manner which can easily be seen and running 24/7. Prefer open source as I do not have a budget for this project and prefer open source projects in general. I'd also prefer for this to be available for CentOS but any linux distro or Windows OS would be acceptable. Thanks!

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• Is it possible to do a web search filtered for the user's comprehension level? [migrated]

  - by Tim

  Do any of the major search engines support a filter to indicate the comprehension level of the user and thus to filter out content beyond their scope? So for example, if someone wanted to find results on "astronomy", but to only show content appropriate for someone in junior-high or lower. Alternatively, if there isn't such an existing method directly, any ideas on how this might be accomplished with existing tools? I found this paper, which seems to indicate folks have looked at this, just don't know if there is a real world tool to do this.

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• Lightweight alternative to R for RHEL?

  - by Eric Rath

  I want to use R for some statistical analysis of logfile information, but found that even the "limited" R-core RPM has a lot of dependencies not already installed. I don't want to install so many packages for a peripheral need. Are there lightweight alternatives for simple statistical analysis on RHEL 6? I have an R script that accepts on stdin a large set of values -- one value per line -- and prints out the min, max, mean, median, 95th percentile, and standard deviation. For more context, I'm using grep and awk to find GET requests for a particular path in our webserver log files, get the response times, and calculate the metrics listed above in order to measure the impact on performance of changes to a web application. I don't need any graphing capabilities, just simple computation. Is there something I've overlooked?

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• Use server git installation in GitHub for Windows

  - by Lg102

  We are using Git as the version control for our website development. I work from a laptop, which is connected to the internal network via a WiFi connection. I've mapped the server drives as network drives in Windows. Commands such as git status take significantly longer for me than they do for my co-workers on wired connections. When connecting to the server using SSH and running commands on the git installation there, performance is even better. Is there a way to configure GitHub for Windows to use the server-installed git (with my credentials)? Note: While our production servers has a user configuration with proper permissions, the development server has only one root user.

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• Can I install linux has the host in a dell poweredge server (r710)?

  - by bksunday

  I might have a deal on dual six core poweredge server and I'm about to go test its performance but I'm wondering few things which I can't find answers for, and I can't test them before buying the machine. I don't want vmware at all so can I just wipe it and install linux instead, or is it embedded in some parts I have no access to. Will I still be able to update different firmwares (perc controllers, motherboard, etc) on this dell poweredge or does it require to have the vmware esxi installed as the host os. And optionally.. is there any foreseeable problems in doing so?

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• In a virtual machine monitor such as VMware’s ESXi Server, how are shadow page tables implemented?

  - by ali01

  My understanding is that VMMs such as VMware's ESXi Server maintain shadow page tables to map virtual page addresses of guest operating systems directly to machine (hardware) addresses. I've been told that shadow page tables are then used directly by the processor's paging hardware to allow memory access in the VM to execute without translation overhead. I would like to understand a bit more about how the shadow page table mechanism works in a VMM. Is my high level understanding above correct? What kind of data structures are used in the implementation of shadow page tables? What is the flow of control from the guest operating system all the way to the hardware? How are memory access translations made for a guest operating system before its shadow page table is populated? How is page sharing supported? Short of straight up reading the source code of an open source VMM, what resources can I look into to learn more about hardware virtualization?

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• Slow Gmail attachment download over HTTPS

  - by Todd

  It only affects Gmail. I have tested other HTTP, FTP and HTTPS websites and downloading is fine, at the exact same time the problem is affecting a Gmail attachment download. The symptoms include both: High waiting time, before the download starts (on the order of 30 seconds); AND Very slow download transfer speeds (on the order of 1kbps) It's a very strange problem, and I didn't find any recent issues relating to Google Australia. The account works fine at another site with a different ISP, so it's either a computer configuration or ISP - I lean to the latter.

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• Small WiFi Network In a Noisy Environment

  - by Sam Skuce

  My company is demoing our network enabled products at big conferences. For this purpose, we would like to be able to set up a small WiFi network in our booth with a range of less than 10 meters. We will only be connecting the device that we are demoing and the iPad or PC running our demo software. I understand that there are conferences that won't allow you to run your own WiFi equipment, but some fairly big ones do (e.g. IMTS, which we were just at). I know that the AP should be encrypted and not broadcast its SSID, but are there additional equipment considerations to deal with the high level of RF noise in such an environment? Is there a particular technology that I should be looking at?

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• solutions for a webserver dedicated to manage permissions/ACL and (reverse) proxying API servers?

  - by giohappy

  I'm considering various layouts to expose various HTTP API services (running on their own differents servers) through a frontend server dedicated to manage permissions on behalf of the API services. I've considered various options, from the classical ones like Nginx, Apache, etc. to HAProxy, passing by the various Python webserver solutions like Tornado, Twisted (which gives me the opportunity to implement my own ACL system easily). The foundamental feature is high performance and scalability, and the ability to manage fine grained ACL rules (similar to the HAProxy ACL system) I would like to know what is a suggested approach to setup what I need, and if (opne source) ready-to-use solutions are already available dedicated to this.

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• How can I monitor ports on Windows?

  - by Olav

  What is the simplest way on "local" (1*) Windows, for known ports, to: Find out if it is used. Find out as much as possible about what is behind the port. Find out as much as possible about traffic through the port. Find out if something else is interfering with the port and traffic to it. I have used Fiddler in the past, but I think that's mostly HTTP? I don't if Wire-shark does more? I think there is a tool closely integrated with Windows? Which one? (5). I am looking at NMap, but its seems to be more a suite of tools, and a high entry level. 1*: Primarily this is for what happens inside my Windows Machine, but if necessary, I can for example use a VM, or the wireless connection.

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• my.ini optimization on Windows 2008 R2 VPS

  - by MKphpDev

  I have a vmware VPS running Windows Server 2008 R2 Enterprise that has performance issues with MySQL. Every few minutes, MySQL stall for few seconds then responed to queries. I'm sure that my.ini need to be optimized, but unfortunately, I don't have any idea of my.ini configuration. What's running on the server: 2 small wordpress blogs, 1 vbulletin forums (approx. 1.2 GB database, and increasing), small database for some sort of plug-ins (no more than 4000 records) Server Info: Processor: Intel Xeon X5550 @ 2.67GHz, RAM: 6 GB (memory useage never exceeded 2 GB), MySQL 5.5, PHP 5.3.10, IIS 7 current my.ini: [mysqld] default-storage-engine=INNODB sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE _USER,NO_ENGINE_SUBSTITUTION" max_connections=250 myisam_max_sort_file_size=20G innodb_additional_mem_pool_size=256M innodb_flush_log_at_trx_commit=1 innodb_log_buffer_size=8M innodb_buffer_pool_size=512MB innodb_log_file_size=128M innodb_thread_concurrency=10 key_buffer_size = 512M myisam_sort_buffer_size = 8M join_buffer_size = 256K read_buffer_size = 256K sort_buffer_size = 256K table_cache = 4000 thread_cache_size = 200 wait_timeout = 30 connect_timeout = 10 tmp_table_size = 32M max_allowed_packet = 1M max_connect_errors = 10000 query_cache_size = 16M query_cache_limit = 2M query_cache_type = 1 query_cache_min_res_unit = 1024 query_prealloc_size = 16384 query_alloc_block_size = 16384 skip-external-locking read_rnd_buffer_size=1M max_heap_table_size=16M thread_concurrency=8 [mysqld_safe] open_files_limit = 8192 [mysqldump] quick max_allowed_packet = 16M [myisamchk] key_buffer_size = 128M sort_buffer_size = 128M read_buffer = 2M write_buffer = 2M any help with that, please?

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• How long does it take in practice to warm up large in-memory databases?

  - by Sim

  Companies such as Peak Hosting are offering 64 core machines with 512Gb RAM for $2K/month. This is a very interesting choice for in-memory databases such as Memcached/Redis as well as databases whose performance degrades rapidly when the data & indexes don't fit in RAM, such as MongoDB. My main concern with monster machines such as these is the time it takes to warm up an in-memory database. In my experience, theoretical metrics, e.g., that SATA can load 100Mb/sec, fall short of what happens in practice. Even at that rate, 100Mb/sec means that loading up 512Gb RAM machine from SATA disks can take over 1 1/2 hours (!). I am looking for real-world reports of warm-up times for machines with very large memory. Please, share details of the software on the machine, data size, storage configuration, e.g., SATA or SSD, network, hosting/cloud provider, if relevant, etc.

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