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• Don't run cron job if already running

  - by webnoob

  Hi All, I know this question has been asked already but I either didn't understand the answer or it didn't apply to me. I have a php script that I am calling every 1 minute using CPanel to set up the Cron Job. The nature of the script means that it could overrun for just over the minute so I need to know how to stop the next one running if the first one hasn't completed. I have a VPS running CENTOS 5.5 and have access to WHM and CPanel. I have never used Linux before (only just got the server yesterday) so I have no idea what I am doing and would appreciate some help if possible. If I need to provide more information please let me know (I don't know what info you would need at the moment). Thanks.

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• how to fix An error occurred during the processing of a configuration file required to service this request

  - by Alex

  Just created branda new MVC 4 project and instead of expected "hello world" got following error: ==================================================== Server Error in '/' Application. Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: Default Role Provider could not be found. Source Error: Line 244: Line 245: Line 246: Line 247: Line 248: Source File: c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Config\machine.config Line: 246 Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272 =============================================================== Any idea how to fix this? Thanks

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• Mediawiki create user error after migration

  - by ing0

  So I had a mediawiki installed on windows with MySQL (running on AWS RDS). I've since moved it to a debian server for various reasons, but I think I've messed up the database because of the different versions of mediawiki I have used. The windows install was v 1.20alpha (58f390e). The new debian install is v 1.15.5-2squeeze4. I've tried to update debian but it doesn't find an update, so is this the latest squeeze version? Everything seems to work ok except adding users. It gives me a database error so I ran php maintenance/update.php which ran some stuff OK but didn't make a difference. I think I've not done the correct approach to this sort of move, does anyone know of a better way of doing it? I still have the old wiki running - but not used - on windows (using the same database) so I could always try this again.

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• Using socat to exec php cli

  - by RoyHB

  There are multiple client programs that periodically connect to a port on my server and send a single line of text. When a connection to the port is made I need to start a PHP CLI script that processes the data. There may be many of the remote scripts running/connecting at more or less the same time so I think it would be best if socat forked a process for each connection to run the script. I've gotten socat to do most of what I need, using the command socat tcp-l:myport,fork exec:mypath/socatTest.php I can read the input on php://stdIn. All is good. The problem is that the process doesn't seem to fork, so if a second external program sends data while another is doing the same it gets a connection refused error. Where have I gone wrong?

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• Can NFS be forced to refresh stale files/directories when not using noac on the mount?

  - by johnnycrash

  We mount without using noac. I have a file that I append to once every 20 minutes. Then it will be read with mmap about 5,000 times a minute. We only mmap a couple blocks for each read. Needless to say, noac just kills the access performance, so we don't use it. I add data to the end of the file using a mount with noac and read from a mount without noac. The mounts that are reading are not seeing the new data. I want to know if there is a function I can call from c to refresh the attributes of a path and all its files. EDIT: I should add we cannot mount and unmount since there are 16 servers running on each system and they are constantly accessing the files. Well...maybe we could mount and unmount if each server used their own mount. I'd like to avoid that if possible. thanks!

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• .htaccess - Simulating virtual host wrong link to Parent Directory in Directory Listing

  - by ?????? ?????

  I have a domain dedicated for my local server (.dev), and an .htaccess file which redirects requests like http://folder.dev/subfolder/ to /htdocs/folder/subfolder. It works great and all, except for one minor issue. When I have the Directory Listing enabled, I can access all the folders, subfolders and files properly, except when I click on the Parent Directory link, which, for example, should lead to http://folder.dev, but redirects to http://folder.dev/folder/ and consequently throws 404 not found. Similarly, if Parent Directory should link to http://folder.dev/subfolder/, it links to http://folder.dev/folder/subfolder/. Here's how my .htaccess looks like: RewriteEngine On RewriteBase / RewriteCond %{REQUEST_URI} !(/$|\.) RewriteRule (.*) %{REQUEST_URI}/ [R=301,L] RewriteCond %{ENV:REDIRECT_SUBDOMAIN} ="" RewriteCond %{HTTP_HOST} ^(www\.)?([a-z0-9][-a-z0-9]+)\.dev\.?(:80)?$ [NC] RewriteCond %2 !^www|ftp|mail|pop3|localhost$ RewriteCond %{DOCUMENT_ROOT}/%2 -d RewriteRule ^(.*) %2/$1 [E=SUBDOMAIN:%2,L] RewriteRule ^ - [E=SUBDOMAIN:%{ENV:REDIRECT_SUBDOMAIN}] Apart from that one thing, everything else works fine (e.g. relative links in documents etc.)

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• Setup IPv4 local on IPv6 VPS

  - by A.D.

  I have a dedicated server running multiple IPv6 only OpenVZ containers. I want them to be able to communicate with the IPv4 internet, but I realized that isn't going to be possible with IPv6 only. So they need to have an IPv4 address as well, not sure if a local address will work for it, but pretty sure it should. I added 169.254.1.100 in the container .conf file, but when I try to start it, I get this : Adding IP address(es): (the IPv6 address) 169.254.1.100 arpsend: 169.254.1.100 is detected on another computer : 00:04:9b:f2:b0:00 vps-net_add WARNING: arpsend -c 1 -w 1 -D -e 169.254.1.100 eth0 FAILED I did a lot of research, and searched serverfault before posting this, but found nothing relating to this.

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• Access denied for user 'diduser'@'localhost' to database 'diddata' (1044, 42000)

  - by Arlen Beiler

  I am trying to setup a MySQL server and when I went to create a second user it wouldn't give it permissions for the database. I can connect fine as long as I don't specify a database. Access denied for user 'user'@'localhost' to database 'diddata' The connection details are: { 'host' : 'localhost', 'user' : 'user', 'password' : 'password' , 'database': 'diddata' }; And to create the DB and table I did: CREATE DATABASE IF NOT exists diddata; CREATE USER 'user'@'localhost' IDENTIFIED BY 'password'; GRANT ALL ON user.* TO 'user'@'localhost'; Note that I've changed the username and password in this question. I've already checked the privileges in MySQL workbench and they are there.

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• Constant prompts for credentials from one Mac Outlook 2011 client

  - by Top__Hat

  The majority of my Exchange users are all on Windows 7 and have no issues (at least using Outlook...) but a subset of the executives are ardent Mac users running Outlook 2011 for OS X. One of these clients is prompted every 5-10 minutes for credentials. Ticking the checkbox to remember credentials does not fix the situation. Mac version is 10.7.2. I have already removed and rebuilt the EWS virtual directory on my Client Access server. Outlook anywhere is set to NTLM authentication. None of the Microsoft clients are experiencing this issue. What else can I do to make this issue go away?

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• JBoss behind NAT hostname problem

  - by z0mbix

  My company has a JBoss cluster sitting behind a firewall that performs NAT. We forward ports to JBoss from the firewall, so that our client application can access the server. We are having trouble when JBoss replies it tells the clients to connect to the internal hostname, not the external one with which the initial connection was made. Is this something that is easily resolved/configured? How are other JBoss app servers configured behind NAT firewalls? Split-horizon DNS? Many Thanks

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• How to add recently set cookies to nginx's access log

  - by etoleb

  I'd like to include cookie data in an nginx access log like so: (simplified example) log_format foo '$remote_addr "$request" $cookie_bar'; access_log /var/log/nginx/access.log foo; This works great on requests that already have a cookie "bar", but for the first request to my server nginx will report "-" as the value of "bar". It seems like my problem is that nginx is looking at the request headers for the cookie value. Is there a way check for a Set-Cookie in the response and use that as a fallback?

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• Upgrading phpmyadmin (and other packages) on Debian Squeeze

  - by westexasman

  I just setup a new VM with Debian Squeeze (latest stable release, 6.0.4). I am going for a webserver, so I installed the usual... apache, php5, mysql, phpmyadmin, etc. Everything went well, everything is working. My question is about upgrading packages. I noticed the phpmyadmin version is 3.3.7... the latest is 3.4.10.1. Doing apt-get update/upgrade does not upgrade the package. How does one go about upgrading packages on a Debian Squeeze server if apt-get update/upgrade does not work? Thanks!

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• Linux router with diffent gateways for incomming and outgoing connections

  - by nkout

  I have the following topology: LAN Users:192.168.1.2 - 254 (192.168.1.0/24) gateway1: 192.168.2.2/24 used for all outgoing connections of LAN users (default gateway) gateway2: 192.168.3.2/24 used for incoming services (destination NAT, ports 80,443 are forwarded to 192.168.2.1) linux router-server R eth0 192.168.1.1/24: LAN eth1 192.168.2.1/24: WWAN1 eth2 192.168.3.1/24: WWAN2 I want to: route all outgoing traffic coming from LAN and R via 192.168.2.2 route the responses to incoming connections via 192.168.3.2 My config: ifconfig eth0 up 192.168.1.1 netmask 255.255.255.0 ifconfig eth1 up 192.168.2.1 netmask 255.255.255.0 ifconfig eth2 up 192.168.3.1 netmask 255.255.255.0 echo 0 >/proc/sys/net/ipv4/ip_forward route add default gw 192.168.2.2 iptables -t nat -A POSTROUTING -d !192.168.0.0/16 -j MASQUERADE I want to add iptables rule to mark incoming traffic from WWAN2 and send back the responses to WWAN2, while keeping default gateway on WWAN1

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• rsnapshot stats

  - by Obscur Moirage

  I'd like to retrieve the following stats from rsnapshot files synced added files modded files deleted files Is there a feature to retrieve these in rsnapshot, or is there another product that's able to do it? EDIT: As requested, I'll try to show that I'm not just asking what I want to do without any research. I wasn't able to locate any rsnapshot feature doing this. Maybe I'm searching in a wrong direction. So, I've built a not very pretty script, called each time before rsnapshot is ran. This Perl script stores each file MD5, in order to compare backup files structures between rsnapshot updates. I'm pretty sure it's worthless to show this code here. I think that keeping an eye on what change on a server, for example, is a useful feature. So, I'm asking. @pauska Most of the time, I'm trying to search for an answer myself, which is not the case here. Thanks

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• How do I permanently disable Linux's console screen saver, system-wide?

  - by raldi

  I've got an Ubuntu server that boots up in text mode. It rarely has a screen or keyboard attached to it, but when I do attach a screen, I usually have to attach a keyboard too, because the darn console mode screen saver will be on and I'll need to hit a key to see what's going on. I'm aware that the setterm command can disable this, but it's a per-session thing. How can I make it so the machine never ever blanks the screen in text mode, even when it's first booted up and sitting at the login prompt?

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• IIS7 is gzipping files but not serving the gzipped version.

  - by ptrin

  By following a number of helpful blog posts I have configured IIS to gzip my static files. I have even enabled Failed Request Tracing and filtered to the 200 status code, and I can see the successful compression events taking place as well as the finished headers, which look like this: Headers="Content-Type: text/css Content-Encoding: gzip Last-Modified: Mon, 04 Oct 2010 17:35:08 GMT Accept-Ranges: bytes ETag: "02ef37cea63cb1:0" Vary: Accept-Encoding Server: Microsoft-IIS/7.5 X-Powered-By: ASP.NET " However, when I test in Fiddler and Firefox the Content-Encoding header is missing, and the file is not gzipped. This is a similar issue to this question which was never resolved. IIS is generating the gzipped files which I can see in C:\inetpub\temp\IIS Temporary Compressed Files . Does anyone know how I can troubleshoot this?

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• Script to run chown on all folders and setting the owner as the folder name minus the trailing /

  - by Shikoki

  Some numpty ran chown -R username. in the /home folder on our webserver thinking he was in the desired folder. Needless to say the server is throwing a lot of wobbelys. We have over 200 websites and I don't want to chown them all individually so I'm trying to make a script that will change the owner of all the folders to the folder name, without the trailing /. This is all I have so far, once I can remove the / it will be fine, but I'd also like to check if the file contains a . in it, and if it doesn't then run the command, otherwise go to the next one. #!/bin/bash for f in * do test=$f; #manipluate the test variable chown -R $test $f done Any help would be great! Thanks in advance!

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• Setting up VMWare ESXi 5 with a single physical NIC

  - by deed02392

  I have a cheap but powerful dedicated server I am leasing with OVH, because they were recently having a promotion. I would like to try and manage all this power by playing with VMs using ESXi. However I am only provided with a single NIC. I had thought this would be easy to get around since, at home I have a single NIC which is my broadband modem, and yet a simple NAT gateway device happily provides internet access to all my devices. I am struggling to implement this on ESXi, though. Can anyone advise on how I could go about having ESXi and multiple VMs working with just one NIC? Here's my current setup: I believe all I need is to be able to configure NAT from the NIC to all the VMs etc.. How would I set up and administer this kind of infrastructure?

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• OpenBSD: Gateway outside subnet (works in Linux)

  - by kshade

  We need to set up an OpenBSD host to use a default gateway that's outside of it's subnet. This is all I need to do on Linux (not the actual IPs) to achieve it: ifconfig eth0 33.33.33.33/31 up route add 33.33.33.254 dev eth0 route add default gw 33.33.33.254 The problem is that we don't know the proper equivalent of the middle command in OpenBSD. The man page says: If the destination is directly reachable via an interface requiring no intermediary system to act as a gateway, the -iface modifier should be specified; Sadly we can't seem to figure out how to make it work with that. This is a virtual host on an OVH server, they have documentation for many other operating systems showing how to do it here: http://help.ovh.co.uk/BridgeClient

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• Fresh install of nginx causes browser to download index.html instead of opening it

  - by 010110110101

  When I view this in Chrome, http://localhost:90 the file is downloaded instead of displayed in Chrome. This question has been asked a lot of times on SO, but about index.php files. My problem is a plain jane HTML file, not a PHP file. That hasn't been asked yet. I was hoping the solution would be similar, but I haven't been able to figure it out. Here's my example.com.conf: server { server_name localhost; listen 90; root /var/www/example.com/html index index.html location / { try_file $uri $uri/ =404; } } My index.html file contains only two words, no markup Hello World I think it's the mime.types. The mime.types file has the entry for html in it. This is a fresh nginx install. nginx -t reports "test is successful"

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• How to add recently set cookies to nginx's access log

  - by etoleb

  I'd like to include cookie data in an nginx access log like so: (simplified example) log_format foo '$remote_addr "$request" $cookie_bar'; access_log /var/log/nginx/access.log foo; This works great on requests that already have a cookie "bar", but for the first request to my server nginx will report "-" as the value of "bar". It seems like my problem is that nginx is looking at the request headers for the cookie value. Is there a way check for a Set-Cookie in the response and use that as a fallback?

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• mod_rewrite only one extension

  - by Matthias Reisner

  Currently I'm having the following htaccess content: <IfModule mod_rewrite.c> RewriteEngine on RewriteRule ^(.*).html$ $1.php </IfModule> I want to change the php extension to html. Now if I browse for localhost/xx.html I get the right content. BUT I also can use xx.php or xx to access the oontent! I only want to get the content if there is an html extension! How can I make this work??? Example: On the server I have the file foo.php. Now I want the user to type in foo.html in the browser to get the content of foo.php. But if he types foo.php there will be an error. I already tried this RewriteRule ^(.*)[^\.html]$ error.php RewriteRule ^(.*)\.html$ $1.php But that does not really work Thanks!

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• limit the speed of writing files to NFS

  - by xgwang

  CentOS 5.6 NFS is mounted on the server for backup disk space. When the backup job started, it could reach 80MB/s and we really do not expect it took so much bandwidth. So i need to find a way to limit the speed of writing to NFS. I tried rsync with --bwlimit=5000. However, it did limit the reading speed, but the accumulated data still was written at 80MB/s, and no writing activities for seconds. Is there any way to limit the writing speed of NFS?

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• Forward public port to localhost

  - by Dan

  I have a process running on my Ubuntu 12.04 server that insists on binding to a public IP address. I only want it accessible from localhost, and NOT the outside world. I've been trying to work out a way to forward 1.2.3.4:8888 to 127.0.0.1:8888. I saw something about iptables not wanting to forward connections to loopback, and I haven't been able to make it work with xinetd either. It's also important that the connection not only be available on localhost, but be inaccessible on the interface it's trying to run on. Is this even possible?

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• Setting up Django application on lighttpd behind apache reverse proxy

  - by ml256

  I have a Django app at http://some_other_example.com (it will be behind firewall) running on lighttpd server with fastcgi. I need make it available under http://example.com/myapp. It works fine except for redirects - when I login from http://example.com/myapp/login it redirects me to http://example.com instead of http://example.com/myapp. When logging-in from http://some_other_example.com/login it is ok. My configuration: apache2.conf at example.com: ProxyPass /myapp http://some_other_example.com ProxyPassReverse /myapp http://some_other_example.com ProxyHTMLURLMap http://some_other_example.com /myapp <Location /myapp> SetOutputFilter proxy-html ProxyHTMLExtended On ProxyHTMLURLMap / /myapp/ </Location> in settings.py I added USE_X_FORWARDED_HOST = True but it didn't help

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