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  • *Simple* way to block DDoS by number of requests

    - by Eduard Luca
    I have 3 Varnish 3.0.2 servers with Apache 2 as backends, which are being load balanced through a HAproxy separate server. I need to find a very simple program (I'm not much of a sysadmin), which blocks requests from an IP, if that IP has made more than X requests in Y seconds. Would something like this be achievable with a simple solution? Right now I have to block all requests manually with iptables.

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  • Extract number with regex

    - by Joey
    I have this string: > HTTP/1.1 200 OK Date: Tue, 12 Nov 2013 15:26:17 GMT Server: > Apache/2.2.3 (CentOS) Last-Modified: Fri, 08 Nov 2013 21:34:50 GMT > ETag: "452//path/to/file" > Accept-Ranges: bytes Content-Length: 26010 Connection: close > Content-Type: text/plain; charset=UTF-8 And would like to extract 452 which is before // and after ETag, what regex to use? I am stuck. Thanks a lot

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  • router only assigns small number of IPs

    - by Liam Coates
    Been having a problem with my router for a while now, might just be because it is really old but here's the problem: If a lot of computers are connected to my home network someone will get disconnected. They are assigned IPs and it seems like at a certain point (and I don't know how many) you either get assigned the same IP as someone else or something else is happening and you get disconnected - until i soft reset it and it works again which takes 30 secs. I'd say my tablet, my PC, my sisters iPad, 2 laptops and a netbook is the most that can be connected at one time so that is 6 but that should be fine. The only way I know this is the problem is because I turned on my tablet and I was online on my PC, got disconnected but my tablet was still connected, this is just after i turned the tablet on so I know my router is having difficulty with IPs, it is like it assigned the same IP to the tablet which then clashed with my desktop and knocked me off. I see that sometimes the following solves it as well so I wrote a batch file with a menu to execute these commands as I have to do it so often. ipconfig /release ipconfig /flushdns ipconfig /renew Any ideas? Or shall I just get a new router as this one is old and maybe can't handle giving out that many IPs? Cheers!

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  • Postgresql spawning a ridiculous number of postmaster processes

    - by Kevin Loney
    For some reason postgres is spawning 700 postmaster processes for handling database requests and the postgres log file if full of 'unexpected EOF on client connection', 'incomplete startup packet' and 'sorry, too many clients already'. netstat tells me that all the open connections are local and I'm pretty sure are coming from postgres internally. This particular instance has been running just fine for the last 230 days or so and nothing has changed configuration wise. Any thoughts on where I should be looking to try and resolve this issue? This is my first time diagnosing a problem like this so if there is any steps I can take to help narrow down the cause that would be helpful as well.

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  • My linux server "Number of processes created" and "Context switches" are growing incredibly fast

    - by Jorge Fuentes González
    I have a strange behaviour in my server :-/. Is a OpenVZ VPS (I think is OpenVZ, because /proc/user_beancounters exists and df -h returns /dev/simfs drive. Also ifconfig returns venet0). When I do cat /proc/stat, I can see how each second about 50-100 processes are created and happens about 800k-1200k context switches! All that info is with the server completely idle, no traffic nor programs running. Top shows 0 load average and 100% idle CPU. I've closed all non-needed services (httpd, mysqld, sendmail, nagios, named...) and the problem still happens. I do ps -ALf each second too and I don't see any changes, only a new ps process is created each time and the PID is just the same as before + 1, so new processes are not created, so I thought that process growing in cat /proc/stat must be threads (Yes, seems that processes in /proc/stat counts threads creation too as this states: http://webcache.googleusercontent.com/search?q=cache:8NLgzKEzHQQJ:www.linuxhowtos.org/System/procstat.htm&hl=es&tbo=d&gl=es&strip=1). I've changed to /proc dir and done cat [PID]\status with all PIDs listed with ls (Including kernel ones) and in any process voluntary_ctxt_switches nor nonvoluntary_ctxt_switches are growing at the same speed as cat /proc/stat does (just a few tens/second), Threads keeps the same also. I've done strace -p PID to all process too so I can see if any process is crating threads or something but the only process that has a bit of movement is ssh and that movement is read/write operations because of the data is sending to my terminal. After that, I've done vmstat -s and saw that forks is growing at the same speed processes in /proc/stat does. As http://linux.die.net/man/2/fork says, each fork() creates a new PID but my server PID is not growing! The last thing I can think of is that all process data that proc/stat and vmstat -s show is shared with all the other VPS stored in the same machine, but I don't know if that is correct... If someone can throw some light on this I would be really grateful.

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  • the effect of large number of files on disk space in unix filesystems

    - by user46976
    If I have a text file in Unix that contains N-many independent entries (e.g. records about employees, where each employee has a separate record), is it expected that this file will take up less space than if I split the file into N files, each containing the entry for one employee? in other words, can one save significant space on unix file systems by concatenating many files together, or is the difference negligible? thanks.

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  • Optimum number of threads while multitasking

    - by Gun Deniz
    I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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  • change revision number in SVN

    - by Alaa Alomari
    I have a system that receives files from clients using svn, and we keep track of revision ID in one of our databases. every year we clear the svn repo, and create new repo as it gets very large size. now how can i preserve the revision id when i create new repo. in other words my repo for this year will reach 20000 revisions. how can i start my new repo from revision id 20001. I hope this can be done

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  • Auto log off windows machine after certain number of minutes

    - by Marty Heath
    I have three machines on my network, two are windows xp and one is windows 7. i would like to have all three machines log a user off if they are on for more than 60 minutes. And I would like this to be applied to the machine not on a per user basis, because I do not want this policy to apply to those users on any other machine. I have installed winexit.scr on one of the machines but the problem is that I cannot change the default value of 10 minutes for the screensaver because that is controlled through group policy, and I cannot seem to find where to change that through group policy on a per machine basis NOT on a per user basis. If I have left out any details I apologize please let me know anything that is needed

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  • ixgbe driver: Limit the max number of cores

    - by Shellex Wai
    I have a Linux workstation with 48 cores and runs ixgbe driver for fiber interface. And I have to test a project name Netmap on it. NetMap is a high performance network framework for high speed interfaces, which has been ported to Linux recently. For some reasons, I must try it on the machine. So I compile it and follow the instructions to run the test problems, but it doesn't work. I check dmesg and it says: [10399.085736] 794.159015 netmap_set_ringid [486] ringid o4o1 set to all 48 HW RINGS [10399.085742] 794.282011 netmap_obj_malloc [220] netmap_if request size 816 too large I asked the author of netmap for help. He told me that I have too many cores in the machine and it should work if I tell ixgbe use less cores (2 to 4 is ok). I am not familiar to driver development and I don't know how to limit the ring numbers by passing arguments to ixgbe driver. So I check the spec from intel's website but found nothing about it. So I come here for more helps. Thank you.

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  • Insert total number of slides in powerpoint 2007

    - by Bob Rivers
    Hi, Is it possible to insert to total amount of slides in a powerpoint footnote? I'm looking for an automated way. Of couse that I could edit the footer and put it manually, but, if I increase/decrease it, I would be necessary to adjust it. And this is something that we always forget. The help at MS explains how to do it manually. I can't believe that powerpoint doesn't have it... TIA, Bob

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  • MySql calculate number of connections needed

    - by Udi I
    I am trying to figure my needs regarding web service hosting. After trying Azure I have realized that the default MySql they provide (through a third party) limits the account to 4 connections. You can then upgrade the account to 15, 30 or 40 connections (which is quite expensive). Their 15 connections plan is descirbed as: "Excellent choice for light test and staging apps that need a reliable MySQL database". I have 2 questions: if my application is a web service which needs to preform ~120k Queries a day (Normal/BELL distribution) and each query is ~150ms(duration)/~400ms(fetch), how many connection do I need? If instead of using cloud computing, I will choose a VPS, how many connections will I be able to handle on a 1GB 2 cores VPS? Thank you!

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  • Email server for huge number of subscriber

    - by bogha
    My question is that my company is thinking of providing a free email account for each of its customers. As a new company we will assume that our corporate email system will be MS Exchange server which will support about 1000 employees. They are asking why not adding the customer list to be a part of Exchange users. My suggestion was to separate the two systems, for the corporate we can use Exchange but for customers (around 30000) we have to use a Linux based system. My only argument was that Linux can be used for enterprise services like this and Microsoft may fail. What do you suggest? And if you are with me on choosing Linux as the server platform, what do you suggest to use as an alternative for Exchange in Linux? Thank you.

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  • Indenting an x number of lines in vim

    - by Mack Stump
    I've been coding in Java for a job recently and I've noticed that I'll write some code and then determine that I need to wrap the code in a try/catch block. I've just been moving to the beginning of a line and adding a tab. 0 i <tab> <esc> k (repeat process until at beginning or end of block) Now this was fine the first three or four times I had to indent but now it's just become tedious and I'm a lazy person. Could someone suggest an easier way I could deal with this problem?

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  • MacOSX Dock - number of open windows?

    - by Pydev UA
    There is one big issue for me with Doc in OSX - it does not shows you if more than one window opened in application For example - I were browsing with firefox and some site opens a background window with some sounds - and I have no idea where it comes from - Dock does not tell you if some application opens more than one window.. Is there a way (or some application) that can add some mark to application icon in Dock if it has more than one window open?

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  • excel truncating phone number

    - by user15586
    I have a csv file that contains cells such as "+1.8882789780". When viewed in Excel, it loses the last digit possibly due to excel truncation. Is there a way to either change the setting in Excel to prevent this from happening or change the csv file in some way? One way is to wrap single quotes around the cell contents in addition to the double quotes. "'+1.8882789780'" Is there a better way?

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  • Computing Number of Bits in Public Key

    - by eb80
    I am working with DKIM and trying to compute the public key size of some DKIM signatures. I know from tools that Gmail's is now 2048, but how could I have figured this out myself (i.e., what exact Linux commands and why)? user@host$ dig txt 20120113._domainkey.gmail.com ; <<>> DiG 9.8.3-P1 <<>> txt 20120113._domainkey.gmail.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52228 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;20120113._domainkey.gmail.com. IN TXT ;; ANSWER SECTION: 20120113._domainkey.gmail.com. 300 IN TXT "k=rsa\; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1Kd87/UeJjenpabgbFwh+eBCsSTrqmwIYYvywlbhbqoo2DymndFkbjOVIPIldNs/m40KF+yzMn1skyoxcTUGCQs8g3FgD2Ap3ZB5DekAo5wMmk4wimDO+U8QzI3SD0" "7y2+07wlNWwIt8svnxgdxGkVbbhzY8i+RQ9DpSVpPbF7ykQxtKXkv/ahW3KjViiAH+ghvvIhkx4xYSIc9oSwVmAl5OctMEeWUwg8Istjqz8BZeTWbf41fbNhte7Y+YqZOwq1Sd0DbvYAD9NOZK9vlfuac0598HY+vtSBczUiKERHv1yRbcaQtZFh5wtiRrN04BLUTD21MycBX5jYchHjPY/wIDAQAB" ;; Query time: 262 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Mon Nov 19 10:52:06 2012 ;; MSG SIZE rcvd: 462

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  • How to remove large number of files/folders in linux

    - by user1745713
    We are using hadoop to split a table into smaller files to feed to mahout, but in the process, we created a huge amount of _temporary logs. we have an nfs mount for the hadoop volume so we can use all the linux commands to delete folders files, but we just can't get them to be deleted, here's what I've tried so far: hadoop fs -rmr /.../_temporary : hangs for hours and does nothing on nfs mount: rmr -rf /.../_temporary :hangs for hours and does nothing find . -name '*.*' -type f -delete : same as above the folders look like this (38 of these folders inside _temporary): drwxr-xr-x 319324 user user 319322 Oct 24 12:12 _attempt_201310221525_0404_r_000000_0 the content of these are actually folders, not files. each one of those 319322 folders has exactly one file inside. not sure why the do the logging this way. Any help is appreciated.

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  • Resolve `strace` file number to a filename

    - by Mike Pennington
    I am debugging a problem where MoinMoin on CentOS is throwing a permissions error, but I can't track down where the problematic file / directory is. I ran strace -vp <pid> on the apache pid; when I have the problem I see this: epoll_wait(10, {{EPOLLIN, {u32=3487534344, u64=140367313734920}}}, 2, 10000) = 1 accept4(6, {sa_family=AF_INET6, sin6_port=htons(52621), inet_pton (AF_INET6, "::ffff:105.193.30.91", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28], SOCK_CLOEXEC) = 11 ## Later on... read(7, 0x7fffa658ad7f, 1) = -1 EAGAIN (Resource temporarily unavailable) However, since apache is already running, I see no corresponding open() on the file referred to as 7; thus I see the permissions problem, but I still don't know which file is the problem. I know I could try to catch all the file opens when I respawn apache, but I'm hoping there is a way to map file 7 to a real filename... is there a way to do this?

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  • Limit number of concurrent user logins in Windows Server 2008 Active Directory

    - by smhnaji
    Is there the possibility to limit Active Directory users' max concurrent login sessions? I've read many articles and discussions about the solution, but none of them seem to be working. Many had suggested UserLogin script that doesn't work in Windows Server 2008. Some other suggested CConnect that is not good enough. It's also very complicated. Some others have introduced UserLock that should be paid for. It's wondering that Windows Server 2003 DOES have the feature (wile as a third-party), but Windows Server 2008 doesn't have! One of the articles I've read: http://www.edugeek.net/forums/windows-server-2008-r2/61216-multiple-logins.html

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  • Compute number of occurrences in a column of a spreadsheet

    - by wnstnsmth
    I have a Google Drive spreadsheet with a single column that holds string values (Twitter screen names) such as "user1", "user1", "UserX", and I would like to count those values so that I can easily craft a bar chart out of it. So the result should be value occurrence ----------------------- user1 2 UserX 1 ... .... Please note, I only want to look for whole words, and not part words. EG, the words 'on' and 'one' appears in the word 'money' - I would not count this (eg, only the word money is counted). Hope that is clear enough. What formula should I use?

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