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• Getting around the lack of GPT support with CentOS 5.4

  - by sxanness

  Here is my issue and I hoping that there is someone out there that has an answer so I don't end up stuck here at my co-location all day. Last night I came here and upgraded a server (Dell 2970) to have four 1TB Hard Drives in RAID 5 which leaves a 3TB block. I tried to partition this but keep getting an error that GPT is not supported so I found a site online telling me I need to run the dd command and right random data to /dev/sda. This is great (if it works) but taking forever. I have two more machines to upgrade today and not a chair in site. Does anyone have advice on how I can avoid this issue beforehand? Thank You for your advice and support.

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• What response should be made to a continued web-app crack attempt?

  - by Tchalvak

  I've issues with a continuous, concerted cracking attempt on a website (coded in php). The main problem is sql-injection attempts, running on a Debian server. A secondary effect of the problem is being spidered or repeatedly spammed with urls that, though a security hole has been closed, are still obviously related attempts to crack the site, and continue to add load to the site, and thus should be blocked. So what measures can I take to: A: Block known intruders/known attack machines (notably making themselves anonymous via botnet or relaying servers) to prevent their repeated, continuous, timed access from affecting the load of the site, and B: report & respond to the attack (I'm aware that the reporting to law enforcement is almost certainly futile, as may be reporting to the ip/machine where the attacks are originating, but other responses to take would be welcome).

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• Lost disk space in Windows 7, cannot find the missing

  - by Tsanders

  My hard drive is complaining it is low on disk space, but a strange thing seems to be happening: Explorer reports 10Gb of available space (on a 120 Gb hard disk), chkdsk in the command prompt does the same but if I use a disk space tool such as SpaceSniffer or WinDirStat, only 50Gb of data is found. My guess is that there somehow is a hold on a large block of disk space (but that's just a guess) because of a prior very large (40 Gb) download attempt that didn't complete. There isn't 40Gb of files on the drive (hidden or visible), yet Explorer insists that something is there. How can I claim back this hard disk drive (without formatting my hard disk)? SpaceMonger is providing a clue, reporting four unscannable folders which add up to 43Gb: C:\RRBackups C:\System Volume Information C:\Windows\Csc\v2.06 C:\Windows\System32\LogFiles\Wmi\RtBackup Does anybody know what these folders are for, and how I can claim back at least some space? Restore point claims about 4Gb, so that doesn't seem to be the main problem.

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• Development Server Blocked Only from Home

  - by theonlylos

  Recently I've been having an issue with my CentOS 6 test server running Apache and Webmin running on port 10000 where when I try accessing any part of the server - SSH/FTP and even my domains (I have two - both keep getting timeout errors) when I try accessing from any computer on my home network. However when I access via tethering or via my office networks everything loads fine. While the firewall is the first issue at mind, my router never was set to block any special ports, and even after adding port 10000 as a specific exception I'm having no luck. Also, I doubt this is an IP blacklisting issue because I have websites on other servers using CloudFlare for security and I haven't gotten any warnings. Any assistance is greatly apprecaiated. UPDATE: Just some extra details about the issue: My ISP to my knowledge only blocks off ports 25 and 80 for residential users to prevent them from running web servers - however this issue has only come up a day or two ago, before that I was using the server successfully for months. Also the server is not physically located in any of my workspaces - it's a VPS housed in a datacenter

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• Setting up fail2ban to ban failed phpMyAdmin login attempts

  - by Michael Robinson

  We've been using fail2ban to block failed ssh attempts. I would like to setup the same thing for phpMyAdmin as well. As phpMyAdmin doesn't log authentication attempts to a file (that I know of), I'm unsure of how best to go about this. Does a plugin / config exist that makes phpMyAdmin log authentication attempts to a file? Or is there some other place I should look for such an activity log? Ideally I will be able to find a solution that involved modifying fail2ban config only, as I have to configure fail2ban with the same options on multiple servers, and would prefer not to also modify the various phpMyAdmin installations on said servers.

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• please explain my fio results - is O_SYNC|O_DIRECT misbehaving on linux?

  - by Zoltan

  I'm going mad over figuring out what the problem could be with one of our storage boxes. With a simple fio script I'm testing random writes using bs=1M and direct=1. The SSD is a Samsung 840pro attached to an LSI HBA (3Gbit/s ports). This is the result I'm getting under FreeBSD 9.1: WRITE: io=13169MB, aggrb=224743KB/s, minb=224743KB/s, maxb=224743KB/s, mint=60002msec, maxt=60002msec This is regardless of sync being set to 0 or 1. On linux, this is the result with sync=0: WRITE: io=14828MB, aggrb=253060KB/s, minb=253060KB/s, maxb=253060KB/s, mint=60001msec, maxt=60001msec and with sync=1: WRITE: io=6360.0MB, aggrb=108542KB/s, minb=108542KB/s, maxb=108542KB/s, mint=60001msec, maxt=60001msec My understanding is that since I'm operating on the raw block device, O_SYNC should not make any difference - there's no filesystem, any barrier, anything between the writes and the drive itself. Especially with O_DIRECT|O_SYNC set. Any ideas? For reference, here's the fio script I'm testing with: [global] bs=1M ioengine=sync iodepth=4 size=16g direct=1 runtime=60 filename=/dev/sdh sync=1 [rand-write] rw=randwrite stonewall

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• UFW blocks SSL connections Varnish/Apache2 on Ubuntu 12.04

  - by user1383815

  I have installed Virtualmin on a Ubuntu 12.04 server and I'm using LAMP stack with Varnish (:80) in front of Apache (:8000). However, I cannot access https when UFW is enabled. When I disable UFW, all works fine. Here is what UFW logging shows when I attempt to access a website via https: Dec 14 05:42:29 localhost kernel: [64491.327263] [UFW BLOCK] IN=eth0 OUT= MAC=e4:11:5b:e5:ef:8c:00:d0:02:8f:f0:00:08:00 SRC=MY_IP_ADDRESS DST=SERVER_IP_ADDRESS LEN=52 TOS=0x00 PREC=0x00 TTL=115 ID=2524 DF PROTO=TCP SPT=56430 DPT=20000 WINDOW=8192 RES=0x00 SYN URGP=0 Here is my UFW ruleset: $ ufw status Status: active To Action From -- ------ ---- 2221 ALLOW Anywhere 10000 ALLOW Anywhere 80 ALLOW Anywhere 21 ALLOW Anywhere 8000 ALLOW Anywhere Apache Secure ALLOW Anywhere 2221 ALLOW Anywhere (v6) 10000 ALLOW Anywhere (v6) 80 ALLOW Anywhere (v6) 21 ALLOW Anywhere (v6) 8000 ALLOW Anywhere (v6) Apache Secure (v6) ALLOW Anywhere (v6) Does anyone have any pointers how to fix this problem? Thank you for your time.

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• Reversing an lvreduce of LVM to original size

  - by praspa

  On a RHEL system that uses LVM 2 with 4K blocks. Have been successful in reducing the LV, but trying to get steps to reverse the operation so that the LV returns to its original size. Using these steps to reduce the LV by 1GB, # umount /foo # e2fsk -f /dev/mylvm/foo # resize2fs /dev/mylvm/foo <Current LV Block count - 1GB/4K> # lvreduce --size <Current # GB - 1GB> /dev/mylvm/foo Then to reverse the reduction # lvextend --size <Original #GB> /dev/mylvm/foo # resize2fs /dev/mylvm/foo The reversal gets close to the orignal size. A 'df -h' reports that it seems to be about ~ 0.1GB shy of the original size. Using these utilities, is there a better procedure to shrink and grow the LV so that the original state can be recovered effectively?

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• Throttle connections to web service if load gets too high?

  - by Joseph Turian

  I have a web site that communicates via XMLRPC with an XMLRPC server web service. (The web service is written in Python using xmlrpclib.) I believe that xmlrpclib will block while it is handling one request. So if there are three users with an xmlrpclib request ahead of you, your response takes four times as long. How do I handle it if I receive too many XMLRPC requests and the web service gets bogged down and has slow response time? If I am getting slashdotted, my preferred behavior is that the first users get good response times and everyone else is told to come back later. I think this is superior to giving everyone terrible response times. How do I create this behavior? Is this called load-balancing? I am not actually balancing though, until I have multiple servers.

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• Excel scatter chart with multiple date ranges

  - by Abiel

  I have multiple blocks of time series data on an Excel sheet, with each block having its own set of dates. For example, I might have dates in column A, values in column B, and then dates in column D and values in column E. The values in B go with the dates in A, and the values in E go with the dates in D. The dates in A and D may not be the same. I would like to create a scatter chart with a time category axis that is the union of my two input date ranges in columns A and D. If I select all the data and then go insert chart (in Excel 2010), Excel treats only column A as the X axis, and looks at D as just another set of values. I can get Excel to do what I want by first just charting columns A and B, then selecting D and E and copy-pasting onto the chart. However, I would like to avoid this two-step procedure if possible.

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• I am unable to get the subdomain from the URL in NGINX

  - by Jean-Nicolas Boulay Desjardins

  I am unable to get the subdomain from the URL in NGINX. Here is my config: server { listen 80; server_name ~^(?<appname>)\.example\.com$; rewrite ^ https://$appname.example.com$request_uri? permanent; } When I do: http://bob.example.com/ I am sent to: https://.example.com/ I don't know what I am doing wrong. I am using NGiNX 1.2.7. I have another config for the: http://example.com/ So I have one server block for the domain without the subdomain and the second with the subdomain... This is about the subdomain.

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• Protect me from this perl syn flood script [closed]

  - by Luka

  Possible Duplicate: How to best defend against a “slowloris” DOS attack against an Apache web server? As everybody here I was interested in hacking in a period of time, using a perl scripts. CSF is protecting me from every perl script which can make damage. But not from this one here: http://pastebin.com/CfRiSVkQ It's Syn Flood script, when I attack my dedicated server from another dedicated with 100MBPS link csf is detecting the attack and he always block attackers address but I am flooded and sites are down, I get email from csf, but attack is still damaging sites! Then I need to restart httpd, csf and sites are online again...

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• Nearest PC equivalent to Mac Target Disk Mode?

  - by username

  Mac firmware has a special boot mode that allows you to offer its internal hdd to another computer as an external disk (you just connect the two machines via an IEEE 1394 cable). Only the second machine needs a functioning OS installed. Any good suggestions for something similar on the PC side of things? Block level access isn't important to me, I'd just like to be able to copy files off it. It doesn't matter to me if it uses Ethernet, IEEE 1394, or wifi - I just like having a quick way to access files on a client PC. Is there any single-purpose Linux distro specially designed to do this? It'd be nice to have something super simple, quickbooting, and small that I could install on a USB drive. I used to use Knoppix, but it's overkill as a Target Mode replacement.

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• Is there a way to create a copy-on-write copy of a directory?

  - by BCS

  I'm thinking of a situation where I would have something that creates a copy of a directory, tweaks a few files, and then does some processing on the result. This wold be done fairly often, maybe a few dozen times a day. (The exact use case is testing patch submissions; dupe the code, patch it, build/test/report/etc.) What I'm looking for could be done by creating a new directory structure and populating it with hard links from the origonal. However this only works if all the tools you use delete and recreate files rather than edit them in place. Is there a way to have the file system do copy-on-write for a file? Note: I'm aware that many FSs use COW at a block level (all updates are done via writes to new blocks) but this is not what I want.

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• No input file specified on nginx and php-cgi

  - by Sandeep Bansal

  I'm trying to run nginx and php-cgi on my Windows PC, I've got up to the point where I want to move the html directory back two directory's so I can sort of create a structure. The only problem I have now is that PHP doesn't pick up any .php file. I have tried loading a static html file (localhost/test.html) and it works fine but localhost/info.php doesn't work at all. Can anyone give me some guidance on this? The part of the server block can be found below. server { listen 80; server_name localhost; root ../../www; index index.html index.htm index.php; #charset koi8-r; #access_log logs/host.access.log main; location ~ \.php$ { fastcgi_pass 127.0.0.1:9123; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } Thanks

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• How do I mount a HFS+ dd image in OSX?

  - by Paul McMillan

  I had an HFS+ formatted drive that was going bad and wouldn't mount at all on OSX. I created an image using ddrescue on linux, and was able to save most of it. I can mount the drive and see the data just fine in linux using this: mount -o loop -t hfsplus dd_image /Volumes/mountpoint This doesn't work on my OSX system since hfsplus isn't a valid filesystem type. If I try: mount -t hfs image mountpoint It complains that it needs a block device. What's the fix here?

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• Self-hosted image gallery

  - by Robert Munteanu

  I'd like to host an image gallery for family and friends. Is there any solution out here which offers: albums ( I expect most do ); ability to specificy tags/persons/places etc, similar to what f-spot does; an API to upload multiple photos or just a bulk uploader; block out unregistered users; allow users to leave comments. Update: please do assume that I'm able to host the service myself if I've asked for a self-hosted solution.

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• How can I selectively increase latency? E.g. throttle games

  - by Arcymag

  Basically, I want networked games to run poorly on a network, but I want everything else to run smoothly. I would also appreciate advice on blocking games in general. As far as I can tell, there's a few ways to completely prevent an internet game from running: Blocking entirely via DNS configuration (e.g. hosts file), or router DNS configuration Blocking entirely via a separate DNS server Blocking the application, by uninstalling or some kind of access control Blocking the application by automatically killing the process every once in a while Blocking the application by corrupting files periodically However, I would like a more subtle way to block a program. Something that either: Increases latency (would this be doable through some kind of QoS like what DD-WRT offers?) Increases latency by using a special routing configuration for specific target IPs Throttle other systems resources, such as memory, IO, or CPU Screw around with keyboard configurations when a game is launched I would like this to work on MacOSX and Windows, but Linux would be great too. FYI I don't have a kid, but I was brainstorming with some friends and parents.

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• GlusterFs - high load 90-107% CPU

  - by Sara

  I try and try and try to performance and fix problem with gluster, i try all. I served on gluster webpages, php files, images etc. I have problem after update from 3.3.0 to 3.3.1. I try 3.4 when i think maybe fix it but still the same problem. I temporarily have 1 brick, but before upgrade will be fine. Config: Volume Name: ... Type: Replicate Volume ID: ... Status: Started Number of Bricks: 0 x 2 = 1 Transport-type: tcp Bricks: Brick1: ...:/... Options Reconfigured: cluster.stripe-block-size: 128KB performance.cache-max-file-size: 100MB performance.flush-behind: on performance.io-thread-count: 16 performance.cache-size: 256MB auth.allow: ... performance.cache-refresh-timeout: 5 performance.write-behind-window-size: 1024MB I use fuse, hmm "Maybe the high load is due to the unavailable brick" i think about it, but i cant find information on how to safely change type of volume. Maybe u know how?

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• limit linux background flush (dirty pages)

  - by korkman

  Background flushing in linux happens when either too much written data is pending (adjustable via /proc/sys/vm/dirty_background_ratio) or a timeout for pending writes is reached (/proc/sys/vm/dirty_expire_centisecs). Unless another limit is being hit (/proc/sys/vm/dirty_ratio), more written data may be cached. Further writes will block. In theory, this should create a background process writing out dirty pages without disturbing other processes. In practice, it does disturb any process doing uncached reading or synchronous writing. Badly. This is because the background flush actually writes at 100% device speed and any other device requests at this time will be delayed (because all queues and write-caches on the road are filled). Is there any way to limit the amount of requests per second the flushing process performs, or otherwise effectively prioritize other device I/O?

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• Myvidoop error when trying to log in

  - by paul-werner.mp

  Recently I have not been able to get into my myvidoop username. It won't even bring up the pictures and asks to send the access code to one of my email addresses. I have seen this message before and there was no error previously but now it will not send the access code. I've tried accessing the site through firefox and through IE but I get the same thing (whether I went through the add on to get to the site or just typed in the website). I just want to know if I possibly have something that could be blocking it from sending this out. I use the free version of Avira for protection, run Ad Muncher (but I've also tried to get this access code with Ad Muncher closed), and have Ad Block Pro plugin (but like I've said before, the same thing happens in IE). I know it uses Java to send this access code out and I've even updated Java but still cannot get it to send it to me.

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• Spamassassin: How to delete all spam messages on the server?

  - by Beck

  Can't find out, how to configure spamassassin to delete all spam messages. Currenly it's only mark messages as spam, but pass them throught IMAP to client. How to block them from passing through to IMAP clients? http://spamassassin.apache.org/full/3.3.x/doc/Mail_SpamAssassin_Conf.html And it's blocking some of our notification messages... -1.4 ALL_TRUSTED Passed through trusted hosts only via SMTP 0.0 HTML_MESSAGE BODY: HTML included in message 2.4 HTML_IMAGE_ONLY_08 BODY: HTML: images with 400-800 bytes of words 2.9 TVD_SPACE_RATIO BODY: TVD_SPACE_RATIO 1.7 MIME_HTML_ONLY BODY: Message only has text/html MIME parts 1.1 HTML_MIME_NO_HTML_TAG HTML-only message, but there is no HTML tag 1.1 HTML_SHORT_LINK_IMG_1 HTML is very short with a linked image -1.4 AWL AWL: From: address is in the auto white-list This is what clients getting on their mails in place of our notification messages. Any idea how to pass those messages through and how to delete incoming spam? Thanks ;) I have this setup: postfix spamassassin clamav-daemon amavis

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• In Nginx can I set Keep-Alive dynamically depending on ssl connection?

  - by ck_

  I would like to avoid having to repeat all the virtualhost server {} blocks in nginx just to have custom ssl settings that vary slightly from plain http requests. Most ssl directives can be placed right in the main block, except one hurdle I cannot find a workaround for: different keep-alive for https vs http Is there any way I can use $scheme to dynamically change the keepalive_timeout ? I've even considered that I can use more_set_input_headers -r 'Keep-Alive: timeout=60'; to conditionally replace the keep-alive timeout only if it already exists, but the problem is $scheme cannot be used in location ie. this is invalid location ^https {}

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• UNIX-Security Advise

  - by Phoibe

  Hello, I want to build a quite secure UNIX-Server. Mechanisms I already implemented: SNORT + fwsnort for banning psad to block network-scanning attempts Portknocking to start+open SSH (key-based login - no password) hourly update of IP-Tables-Rules from a Security-Subscription Fail2Ban ClamAV & Rootkithunter + Logwatch What service-independent security mechanism would you add to this? What mechanism are you using? The server will run Apache&Postfix. For Apache hiding the server-information ofc. and nothing I can think of for Postfix. Thanks

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• What tools exist for generating "ASCII Tables", if any?

  - by Billy ONeal

  Consider a block like the following: +-----------------------------------+--------------------------+ | In Baseline | Not in Baseline | +---------------+===================================+==========================+ | In Parent # Do Not Report | Mark ACE as AlwaysReport | +---------------+-----------------------------------+--------------------------+ | Not In Parent # Iff parent depth > baseline depth | Report Always | +---------------+-----------------------------------+--------------------------+ I have seen tables like this used quite frequently. For instance, in Requests for Comments (RFC) documents, the standard format of the document is the text format. Another common case is embedding a small table like this into comments of source code. Are there tools which can take a quick and dirty representation of this in Excel, or possibly some textual format, and format it as a table like this?

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