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• Simple, current how-to install mod-security on cPanel server?

  - by linux911

  Does anyone have or know of a simple, up to date how to for installing mod-security on cPanel and configuring it after install? Every how to on the web I've found is at least two years old and is based on a mod-security addon function in cPanel which doesn't exist anymore. There are a couple of free add ons to simplify selecting rule files (configserver's for example) but there's no documentation on which rules a cPanel system "should" be using and so on.

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• MongoDB and datasets that don't fit in RAM no matter how hard you shove

  - by sysadmin1138

  This is very system dependent, but chances are near certain we'll scale past some arbitrary cliff and get into Real Trouble. I'm curious what kind of rules-of-thumb exist for a good RAM to Disk-space ratio. We're planning our next round of systems, and need to make some choices regarding RAM, SSDs, and how much of each the new nodes will get. But now for some performance details! During normal workflow of a single project-run, MongoDB is hit with a very high percentage of writes (70-80%). Once the second stage of the processing pipeline hits, it's extremely high read as it needs to deduplicate records identified in the first half of processing. This is the workflow for which "keep your working set in RAM" is made for, and we're designing around that assumption. The entire dataset is continually hit with random queries from end-user derived sources; though the frequency is irregular, the size is usually pretty small (groups of 10 documents). Since this is user-facing, the replies need to be under the "bored-now" threshold of 3 seconds. This access pattern is much less likely to be in cache, so will be very likely to incur disk hits. A secondary processing workflow is high read of previous processing runs that may be days, weeks, or even months old, and is run infrequently but still needs to be zippy. Up to 100% of the documents in the previous processing run will be accessed. No amount of cache-warming can help with this, I suspect. Finished document sizes vary widely, but the median size is about 8K. The high-read portion of the normal project processing strongly suggests the use of Replicas to help distribute the Read traffic. I have read elsewhere that a 1:10 RAM-GB to HD-GB is a good rule-of-thumb for slow disks, As we are seriously considering using much faster SSDs, I'd like to know if there is a similar rule of thumb for fast disks. I know we're using Mongo in a way where cache-everything really isn't going to fly, which is why I'm looking at ways to engineer a system that can survive such usage. The entire dataset will likely be most of a TB within half a year and keep growing.

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• Conflicting ip routes with local table on attaching a virtual network interface

  - by user1071840

  I have an EC2 instance with these ip rules: $ sudo ip rule show 0: from all lookup local 32766: from all lookup main 32767: from all lookup default I can attach an elastic network interface to it with a private IP. Say the IP of my machine is 10.1.3.12 and the IP of the interface is 10.1.1.190. As soon as I attach the interface to my machine a new entry is added to the routing policy and local routing table: sudo ip rule show 0: from all lookup local 32765: from 10.1.1.190 lookup 10003 32766: from all lookup main 32767: from all lookup default $ sudo ip route show table local broadcast 10.1.1.0 dev eth3 proto kernel scope link src 10.1.1.190 local 10.1.1.190 dev eth3 proto kernel scope host src 10.1.1.190 broadcast 10.1.1.255 dev eth3 proto kernel scope link src 10.1.1.190 broadcast 10.1.3.0 dev eth0 proto kernel scope link src 10.1.3.12 local 10.1.3.12 dev eth0 proto kernel scope host src 10.1.3.12 broadcast 10.1.3.255 dev eth0 proto kernel scope link src 10.1.3.12 broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1 local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1 local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1 broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1 I can send traffic to this ENI directly from a host that can have the same IP as the host the ENI is attached to. This is where the problem starts. I ran tcpdump on the port in question and saw multiple SYNs going to the ENI with src '10.1.3.12' and destination '10.1.1.190' but didn't see even a single ACK. In my understanding if ACKs were being sent from the ENI they'd have destination as 10.1.3.12 i.e. the same as the local machine's IP and such packets will now be routed as local packets matching local routing policy: local 10.1.3.12 dev eth0 proto kernel scope host src 10.1.3.12 I'd like to send all the packets originating from 10.1.1.190 (my ENI) to go back on the same interface i.e. eth3 in this case. Contents of the nee table 10003 are: $ sudo ip route show table 10003 default via 10.1.1.1 dev eth3 I think I can do the following: I don't know if its possible but probably decrease the priority of local table so the packets match the table 10003. Use iptables to mangle these packets and update the local table route to include the mark information But I'm not sure if these are the right approaches.

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• "Discovering items".... yawn

  - by Kez

  I have a rather annoying issue with my Windows 7 computer whereby it seems to take ages to delete, move or copy folders, even when they are empty. The problem is intermittent, to make matters worse. It just says "Discovering items..." for anything up to a couple of minutes before eventually doing what its told. Any suggestions on where to look to stop this happening? I have tried disabling antivirus realtime scanning to rule that out as the root cause.

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• GPU Temperature comparisons between similar GPUs of the same line

  - by White Phoenix

  As a general rule of thumb, if there are two similar GPUs from the same line (i.e. an NVIDIA GTX 260 vs a NVIDIA GTX 280), will the less powerful or more powerful GPU run hotter? This is assuming all other factors stay the same - hardware configuration, cooling setup, ingame settings, etc. Or does this depend entirely upon the GPU itself? I do remember reading that the GTX 280 in this example was terribly inefficient with power and cooling.

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• Configure Apache to use external proxy for internet connection

  - by warpech

  In my application I am using following rewrite rule: RewriteRule ^/ajax(.*) http://api.externalserver.com/$1 [P,QSA,L] You know what it does. Now the problem is that my corporate network requires me to use HTTP proxy for external internet connections. To ilustrate, this doesn't work: curl -v http://api.externalserver.com/login But this works: curl -v -x 11.22.11.22:8585 http://api.externalserver.com/login How can I make Apache use the corporate proxy for external internet requests?

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• How do I uninstall PHP and Apache on linux?

  - by ngache

  Now it's installed wrongly, I need to uninstall and reinstall them. They're installed from source. How can I efficiently uninstall them first? I tried make uninstall in php_source_dir,but only got: make: *** No rule to make target `uninstall'. Stop. Thanks !

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• IIS redirect not working as wanted

  - by Leonardo

  i need help with IIS redirect... My website is on the internet and i want to redirect requests based on the following rule: if URL = http :// contoso.com (public address) - Redirect to http :// contoso.com/portal if URL = http :// myserver (internal address) - Dont do anything if URL = http :// 192.168.0.1 (internal address) - Dont do anything is it possible? how can i do it?!? i managed to get the first one... but i cant get the second and third one to work...

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• Vlan on astaro 120

  - by Crash893

  (I'm not 100% sure where networking/router questions go this is my best guess) I have a astaro (sophos) white UTM 120 router for work I also have about 11 Voip phones with an externaly hosted pbx (company name = pingtone) Is there any advantage to setting up the phones on a vlan vs making a qos rule that all traffic to my tftp server gets right of way? networking is still a little soft to me Thanks

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• How to Exclude an URL for Apache Mod_proxy?

  - by Mughil

  We have two Apache server as front-end and 4 tomcat server as back-end configured using mod_proxy module as load balancer. Now, we want to exclude an single tomcat url from the mod_proxy load balancer. Is there any way or rule to exclude? Proxy Balancer Setting: <Proxy balancer://backend-cluster1> BalancerMember http://10.0.0.1:8080 loadfactor=1 route=test1 retry=10 BalancerMember http://10.0.0.2:8080 loadfactor=1 route=test2 retry=10 </Proxy>

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• VirtualBox Port Forward not working when Guest IP *IS* specified (while doc says opposite)

  - by Patrick

  Trying to port forward from host (Mac OS X) 127.0.0.1:8282 - guest (CentOS)'s 10.10.10.10:8080. Existing port forwards include 127.0.0.1:8181 and 9191 to guest without any IP specified (so whatever it gets through DHCP, as explained in the documentation). Here is how the non-working binding was added: VBoxManage modifyvm "VM name" --natpf1 "rule3,tcp,127.0.0.1,8282,10.10.10.10,8080" Here is how the working ones were added: VBoxManage modifyvm "VM name" --natpf1 "rule1,tcp,127.0.0.1,8181,,80" VBoxManage modifyvm "VM name" --natpf1 "rule2,tcp,127.0.0.1,9191,,9090" And by "non-working", I of course mean not listening (as a prerequisite to forwarding): $ lsof -Pi -n|grep Virtual|grep LISTEN VirtualBo 27050 user 21u IPv4 0x2bbdc68fd363175d 0t0 TCP 127.0.0.1:9191 (LISTEN) VirtualBo 27050 user 22u IPv4 0x2bbdc68fd0e0af75 0t0 TCP 127.0.0.1:8181 (LISTEN) There should be a similar line above but with 127.0.0.1:8282. Just to be clear, this port is listening perfectly fine on the guest itself. And when I remove the guest IP (i.e., clear the 10.10.10.10) the forward works fine, albeit to eth0 (not eth1 where I need it). I can tcpdump and watch the traffic flow back and forth. And yes, I've disabled iptables entirely while testing -- it's not getting blocked anywhere on the guest. As VirtualBox writes in their documentation, you are required to specify the guest IP if it's static (makes sense, no DHCP record it keeps): "If for some reason the guest uses a static assigned IP address not leased from the built-in DHCP server, it is required to specify the guest IP when registering the forwarding rule:". However, doing so (as I need to), seems to break the port forward with nary a report in any log file I can find. (I've reviewed everything in ~/Library/VirtualBox/). Other notes: While I used the above command to add the third rule, I've also verified it showed up correctly in GUI and then removed/re-added from there just to make sure). This forum link -- while very dated -- looks somewhat related in that a port forward to a static IP was not appearing (perhaps they think due to lack of gratuitous arp being sent for host to know IP is there/avail?). Anyway, what gives? Is this still buggy? Any suggestions? If not, easy enough workarounds? What's interesting is that this works perfectly fine on another user's Mac, however he's running a slightly older version (4.3.6 v. 4.3.12).

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• In utf-8 collation, why 11- is less then 1- ?

  - by ???

  I found that the sort result in ASCII: 1- 11- and in UTF-8: 11- 1- I feel it's so counter-intuitive, and it's not dictionary order. Isn't the character '-' (002d) is always less then [0-9] (0030-0039)? What's the general rule in UTF-8 collation? And how to bypass it, just make - be less then [0-9] while keep other characters unchanged for UTF-8, in Linux? (So it can affects the result of ls --sort, sort, etc. )

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• Window 2008 server shared not accessible if Firewall is on

  - by Mirage

  I have folder to be shared on window server 2008. If i disable all firewalls then MAC can see the folder If i enable firewall then MAC can't connect to my folder WHich rule i have to apply in firewall setting to make that share work

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• Setting udev rules in Linux Mint 13

  - by user1233963

  What I'm trying to do is set up a udev rule for my HP headphones (usb) with the aid of several tutorials out there. Created a file ( 90-local.rules ) in /etc/udev/rules.d and added the following: ACTION="add",SUBSYSTEM="usb", ATTR{vendor}=="Hewlett-Packard", RUN+="sh /home/alex/Scripts/usb.sh" The problem is nothing happens when I connect the headphones! What am I doing wrong? note: I did restart udev and the script works also, so it's not that

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• Save as PDF to Folder Script for Apple Mail

  - by patte

  I want to add a script to a rule to auto-print messages as PDF to a specific Folder. What I found was this: http://is.gd/acmsE but it doesn't work for me on OS X 10.6. I already know the Save to PDF command and that you can create simple aliases in the "PDF Services" folder, but I need something automated for this task. I searched the web the whole morning and also tried to write my own Automator workflow but couldn't manage it Any help is highly appreciated.

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• How to Prevent Spotlight from Indexing Non-Apps in /Applications Directory?

  - by Ross Charette

  The only thing I need indexed in the /Applications folder are the .app files. Is there any way to setup a filter to have mds or Spotlight ignore everything in /Applications except .apps? Otherwise, would it be possible to setup a rule for Alfred to omit any non-.app records from /Applications? I still want documents indexed and returned, just not from that specific directory. OS X 10.6.8 if you're wondering.

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• Transparently rewrite requests to a subdomain.

  - by ptrin

  I would like to rewrite requests to http://www.mysite.com/foo to http://foo.mysite.com without the user's address bar changing. Using IIRF I can do the rewrite, but only if I use the [R] modifier flag which makes the rewrite a redirect. Is there a way for me to transparently rewrite requests to a subdomain? Here's the rewrite rule I've been testing with: RewriteRule ^/foo/(.*)?$ http://foo.mysite.com/index.html?$1 [R,L]

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• How to allow only specific directories to use htaccess?

  - by DisgruntledGoat

  Currently in apache2.conf I have AllowOverride all set for /var/www which simply allows htaccess for all the sites on the server (which is Ubuntu, 9.04). However, I'd rather only allow overrides in each site root directory and nothing else. In other words, /var/www/site1, /var/www/site2, etc. can have a htaccess, but all other directories including /var/www and /var/www/site1/content cannot. Is there a way to do this without having to write a rule for every site on the server?

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• Technical details for Server 2012 de-duplication feature

  - by syneticon-dj

  Now that Windows Server 2012 comes with de-duplication features for NTFS volumes I am having a hard time finding technical details about it. I can deduce from the TechNet documentation that the de-duplication action itself is an asynchronous process - not unlike how the SIS Groveler used to work - but there is virtually no detail about the implementation (algorithms used, resources needed, even the info on performance considerations is nothing but a bunch rule-of-thumb-style recommendations). Insights and pointers are greatly appreciated, a comparison to Solaris' ZFS de-duplication efficiency for a set of scenarios would be wonderful.

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• apache robots.txt with SSL

  - by user224013

  I have an .htaccess file with a rewrite rule to get a redirect of every HTTP request to HTTPS. But now I have a problem that my robots.txt is not recognized by some online checker. If I remove the redirect from the .htaccess file the robots.txt is recognized correctly. Maybe I should exclude that the robots.txt is redirects to an HTTPS connection? This is the part of .htaccess for redirecting to HTTPS RewriteCond %{SERVER_PORT} !^443$ RewriteRule (.*) https://%{HTTP_HOST}/$1 [L]

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• Windows XP x64 virtual machine (VMWare ESX) using only 2 CPUs (out of 4)

  - by Mac

  I just converted a physical Windows XP x64 machine with 4 CPUs to a VMWare virtual machine with 4CPUs (on a ESX server) using the VMWare Standalone Converter. Everything worked just great, except that the OS now seems to use only 2 CPUs (when 4 are installed, see the following image). This must be a Windows XP issue rather than a VMWare issue, but I can not really rule out any reason at this stage. What can I do?

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• "Test to measure your ability to follow directions and solve complex problems in a neat and orderly manner." [closed]

  - by Matt

  Use the table of symbol substitutions when answering the problem below: Circle = 0 Dot = 1 Line = 2 Triangle = 3 Square = 4 Pentagon = 5 Hexagon = 6 Cross = 7 Heart = 8 Smiley Face = 9 Use the following special rule when answering the problem below: If ever a square is next to a cross during long multiplication, the square shall be treated as a triangle. Problem: Show your work in doing long multiplication of Pentagon Pentagon Nonagon by Line Square Octagon. Show your work using symbols not numbers.

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• Database server size

  - by David

  I received a recommendation from my hosting provider noting that a general rule in production server management is to ensure that the memory on your database server is larger than the size of your total database. Our database is 1800mb (and growing) and we're being told to purchase a 2GB server. This didn't sit right with me, but I'm not an expert in production server management. We're running a MySQL db with mostly InnoDB tables and some MyISAMs. Thanks!

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• What means empty iptables?

  - by Memochipan

  I'm using CentOS and when type the command: iptables -L -v The output is as follows: Chain INPUT (policy ACCEPT 19614 packets, 2312K bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 13881 packets, 32M bytes) pkts bytes target prot opt in out source destination What does this means I'm able to connect using SSH. Where can I see that rule?

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• How can I instruct nginx to interpret an individual file as php

  - by codecowboy

  A legacy application relies on the following .htaccess rule for an individual file <Files MyFile.html> AddType application/x-httpd-php .html </Files> The new machine has nginx and php-fpm installed with the following config: location ~ \.php$ { try_files $uri =404; fastcgi_split_path_info ^(.+\.php)(/.+)$; fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_index index.php; include fastcgi_params; }

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