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• PXE in an 802.1X environment

  - by newmanth

  My organization is about to implement 802.1X on our enterprise, but we currently use PXE-based OS deployment sequences in SCCM. I'm looking for a way to continue using PXE in an 802.1X environment. Our infrastructure uses Cisco network gear running at 12.2 (or newer). We are an all Windows network and all clients support 802.1X. All new workstations have Intel AMT available (but not factory configured). In a worst case scenario, we'll use a guest vlan for OSD, but I'd rather have the OSD occur in an authenticated session. I've seen white papers that describe using AMT to act as a supplicant for PXE boot, but can't find any implementation details...

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• Is there any SMS/MMS server for LAN environment

  - by Chau Chee Yang

  I am looking for a solution to send SMS/MMS message to mobile device from desktop or browser in LAN environment. As such, it is most probably using TCP/IP protocol to transmit request/response. The server may attach to a GSM device with SIM card attached. An server application would then start accept the request from any LAN client and convey the SMS/MMS to one or more recipients. The server may log all requests for further traffic analysis in later stage. Is there any solution that able to perform what I describe here. Please advice.

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• Apache 2: SetEnvIf "IP Range"

  - by BlaM

  In my Apache config I want to set an environment variable if I see that the visitor comes from an specific IP range. Currently I do it this way: SetEnvIfNoCase Remote_Addr "^194\.8\.7[45]\." banned=spammer-ip SetEnvIfNoCase Remote_Addr "^212\.156\.170\." banned=spammer-ip What I would prefer is something like this: SetEnvIfIpRange 194.8.74.0/23 banned=spammer-ip SetEnvIfIpRange 212.156.170.0/24 banned=spammer-ip ... because I think that converting an IP address to a string and then do an regular expression is a total waste of ressources. I could do an Deny From 194.8.74.0/23 ... but then I don't get a variable that I can check in my 403 error page - to find the reason why access has been denied. Any suggestions what I might miss? Is there an Apache2 MOD that can set environment variables based on "IP Address Ranges"?

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• Is there any way to isolate the python2.7 , mod_wsgi installation from main environment

  - by user31

  I have many local virtual machines for building the django websites. I find it very hard to configure all the machines with mod_wsgi , python and all that installation issues. Is there any way that i can install even python 2.7 , mod_wsgi etc and all that inside the virtual environment folder so that i can just copy paste that folder in my live server and i don't need to mess with mos_wsgi , python 2.7 and other issues. Is it possible or even any close variation of that so that puting the site to live servers is very easy and everything which is needed by site should be included locally I also face many problems when i need to move the django sites across servers

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• What is causing Null Pointer Exception in the following code in java? [migrated]

  - by Joe

  When I run the following code I get Null Pointer Exception. I cannot figure out why that is happening. Need Help. public class LinkedList<T> { private Link head = null; private int length = 0; public T get(int index) { return find(index).item; } public void set(int index, T item) { find(index).item = item; } public int length() { return length; } public void add(T item) { Link<T> ptr = head; if (ptr == null) { // empty list so append to head head = new Link<T>(item); } else { // non-empty list, so locate last link while (ptr.next != null) { ptr = ptr.next; } ptr.next = new Link<T>(item); } length++; // update length cache } // traverse list looking for link at index private Link<T> find(int index) { Link<T> ptr = head; int i = 0; while (i++ != index) { if(ptr!=null) { ptr = ptr.next; } } return ptr; } private static class Link<S> { public S item; public Link<S> next; public Link(S item) { this.item = item; } } public static void main(String[] args) { new LinkedList<String>().get(1); } }

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• Shrink Partition on Production Server

  - by Campo

  SO our production server was only setup with one large partition. I have setup a standby server and properly partitioned it. Now the boss wants the production environment's partition shrunk. It is an HP DL380 G5 We have 4 hot swap drives in a raid 5. How best should I go about doing this. Seems like a bad idea to me. Should I use windows or HP to do the partitioning? What should I be aware of in a production environment? The idea is to put the site (Inetpub) on a separate partition instead of the C: drive. How much downtime should I expect? Is this a terrible idea? Anything else I have missed?

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• Apache RewriteRule with a RewriteMap variable substitution for the VAL argument to environment variable

  - by Eric

  I have an Apache server that serves up binary files to an application (not a browser). The application making the request wants the HTTP Content-MD5 header in HEX format. The default and only option within Apache is Base64. If I add "ContentDigest on" to my VirtualHost, I get this header in Base64. So I wrote a perl script, md5digesthex.pl, that gives me exactly what I want: MD5 in HEX format but I'm struggling with the RewriteRule to get my server to send the result. Here is my current Rewrite recipe: RewriteEngine on RewriteMap md5inhex prg:/www/download/md5digesthex.pl RewriteCond %{REQUEST_URI} ^/download/(.*) RewriteRule ^(.*) %{REQUEST_URI} [E=HASH:${md5inhex:$1}] Header set Content-MD5 "%{HASH}e" env=HASH The problem is that I can't seem to set the HASH environment variable based on the output of the md5inhex map function. It appears this behavior is not supported and I'm at a lost as to how to formulate this...

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• Fast swapping of production and staging in IIS

  - by Nathan Ridley

  I'm using IIS 7 on my own dedicated server. Let's say I have two web applications. One points to folder A, and one points to folder B. The first is used for production and the second is for staging. If I want to set up a scenario whereby I upload my aplication to staging, make sure everybody's happy, then swap the folders that each web application points at, thereby putting "staging" live and making the production environment the new staging environment, what's a good way to do this? I know Microsoft themselves use this methodology on their Azure platform and I've seen it used elsewhere too. How can I do it on my server with IIS7?

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• Webapp in Jetty can't find properties file after running a couple days

  - by Cuga

  I have a webapp running in Jetty on Mac OS 10.6. After a few days of it running and without the server losing power or rebooting, it seems to stop working saying it can't find a properties file. This properties file is included inside the .war file deployed to the /webapps directory. If I restart Jetty as the superuser the web service works again just fine. Can anyone lend any advice to what's going on and how I can fix it? The error being shown when it isn't working is: Problem accessing /my-web-service. Reason: INTERNAL_SERVER_ERROR Caused by: java.lang.NullPointerException at com.company.service.Dao.readFromPropertiesFile(BwDao.java:35) at com.company.service.ServletHandler.doGet(ProxyClass.java:66) ... at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) Here's where the properties files exist that it's trying to read from the .war file: And this is how the properties are being read from the classpath: Properties properties = new Properties(); properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream( "app.properties")); Again, this does work just fine if I have just restarted the server, but it seems to fail after running a few days.

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• How to configure sudoers to always keep LD_LIBRARY_PATH envrionment variable?

  - by Yanick Girouard

  No matter what I try, it seems that the LD_LIBRARY_PATH environment variable is not kept after I run a command with sudo. The only way I managed to have it stick, is to prefix my sudo command with LD_LIBRARY_PATH=/the/path whenever I call it from the command-line, but I would like to not have to do this every time. It seems the env_keep option ignores this variable, and so does the exempt_group option. My %group currently has ALL=(ALL) NOPASSWD:ALL as its access in sudoers. I would like this specific environment variable to be kept for any command I run. How can I do this? My server is running Red Hat Enterprise Linux 5.7.

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• mount dev, proc, sys in a chroot environment?

  - by Patrick

  I'm trying to create a Linux image with custom picked packages. I followed the guide here http://www.olpcnews.com/forum/index.php?topic=4766.0 However, when I tried to install some packages, it failed to configure due to missing the proc, sys, dev directories. So, I learned from other places that I need to "mount" the host proc, ... directories to my chroot environment. Though, I saw two syntax and am not sure which one to use. In host machine: mount --bind /proc <chroot dir>/proc and another syntax (in chroot envrionment): mount -t proc none /proc Which one should I use, and what are the difference? Edit: What I'm trying to do is to hand craft the packages I'm going to use on an XO laptop, because compiling packages takes really long time on the real XO hardware, if I can build all the packages I need and just flash the image to the XO, I can save time and space.

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• crontab environment

  - by Adamski

  I have written various scripts to launch Java server applications, which are typically run for 24 hours before being shut down (by invoking the same script with a different parameter). The script relies on environment variables defined in a file: ~/<user>.env, which I source from .bashrc. This works fine when invoking the script from the command line but if I want to add the script as a crontab entry I run into the problem where .bashrc isn't read. My question: What is the best practice approach for solving this problem? I realise I could define a crontab entry such as: * * * * 1-5 /usr/bin/bash -c '. /home/myuser/myuser.env && /home/myuser/scripts/myscript.sh' ... but this seems plain ugly. Alternatively I could source myuser.env at the beginning of every script, but this would become a nightmare to maintain. Any help appreciated.

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• Java application crashes my computer. How do I troubleshoot?

  - by Oded

  I am using NetBeans 4.1 for my university course (this is an older version, but is the required version for the course - I can't use a newer version). Whenever I use it for longer than several minutes, my computer crashes - it either reboots or I need to reset it. I have tried running with all startup items disabled (to rule out other applications interfering with the app), but it did no good. I have used Sysinternals procmon logging and the logs are corrupt - the only way I was able to get a good log was by enabling boot logging. However these are huge and I don't know what to look for. I am using Windows XP SP3, fully patched up and this is the only application that I have any kind of problem with. Can anyone suggest troubleshooting steps that will help me pinpoint the cause of these crashes and fix them?

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• Advice on new hardware firewall for a small company server-environment

  - by Mestika

  Hi everyone, My companies currently hardware firewall (an old ZyXEL ZyWALL firewall) and is indeed requiring an update to a new firewall. It is a small company with a similar small server-environment, so the need for a huge, complex and expensive solution isn’t there but a more “straight-forward” firewall, that can provide the necessary security to our systems and block unwanted elements from the core server and only accept access through our one server which is used as an “gateway” between the Internet and our internal network. I haven’t that much experience with hardware firewalls so I’m requesting any good advice and/or knowledge on which products will be suited for our specific need. If you need more information about the specific needs we require, please let me know and I’ll provide them to you. Sincerely - Mestika

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• Unable to logoff, disconnect, or reset terminal server user in production environment

  - by l0c0b0x

  I'm looking for some ideas on how to disconnect, logoff, or reset a user's session in a 2008 Terminal Server (unable to login as the user either as it is completely locked-up). This is a production environment, so rebooting the server or doing something system-wide is out of the question for now. Any Powershell tricks to help us with this? We've tried to disconnect, log the user off and reset the session as well as killing the session's processes too, directly from the same terminal server (from the task manager, Terminal Services Manager and the Resource Monitor) with no results. Help! UPDATE: We ended up rebooting the server as no other attempts that we could think of worked. I'll leave this question open hoping someone might have more information about this one issue, and it's potential fixes

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• Parse java console output with awk

  - by Bob Rivers

  Hi, I'm trying to use awk to parse an output generated by a java application, but it isn't working. It seems that the command after the pipe isn't able to get/see the data throwed by the java app. I'm executing the following command (with the return generated by the command): [root@localhost]# java -jar jmxclient.jar usr:pass host:port java.lang:type=Threading ThreadCount 06/11/2010 15:46:37 -0300 org.archive.jmx.Client ThreadCount: 103 What I need it's only the last part of the string. So I'm tryng to use awk (with pipe at the end of the line |awk -F ':' '{print $4}': [root@localhost]# java -jar jmxclient.jar usr:pass host:port java.lang:type=Threading ThreadCount|awk -F ':' '{print $4}' But the output isn't being parsed. It throws the entire string: 06/11/2010 15:46:37 -0300 org.archive.jmx.Client ThreadCount: 103 I also tryed to use |cut -f4 -d":" with the same result: the string isn't parsed. So my question is, how do I parse the output in order to get just the number at the end of the string? TIA, Bob

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• Can I run ubuntu server 64 bit in a VirtualBox on a macbook host ?

  - by Doron

  Hello, I have a macbook pro with Intel Core 2 Due (It's actually not Pro, but it's a January 2009 unibody macbook - when there were both a unibody macbook, and a unibody macbook pro). I'm a php developer. I just installed a new hard drive, and in an effort to create a better development environment, I decided I'll try to create a virtual machine running ubuntu server. Since I need it to work fast (and since, well - it's just better, even if by a little) and I'll already have a delay due to the nature of the apache server being on a virtual host - I want to install a 64 bit version of ubuntu server. Can VirtualBox handle it? Is it s good idea to create such a development environment ? Thank you.

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• Reliable procedure/tool for removing print drivers in Windows 7 (domain environment)

  - by ultrasawblade

  One of the troubleshooting steps in resolving printer-related issues with any version of Windows is to remove installed print drivers and then reinstall the drivers. This is a domain environment and drivers are pulled from a print server. I've had occasion to need to do this on a user's system running Windows 7 Enterprise 64-bit. These procedures don't work: Removing the printer from Devices and Printers (doesn't remove driver obviously) Doing the above, going into Server Properties, and attempting to remove the driver (fails with a "driver in use" error) Opening an empty mmc, adding the Print Management snap-in, and attempting to do the above. Doing sc stop spooler and sc start spooler before doing both of the above Now I know it's possible to remove drivers with the spooler service stopped and then going into the spool directory, as well as deleting registry entries. I'm asking if a tool exists to do this where I can just select the driver in question and it be removed.

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• Outlook Prompting for password from Exchange server in domain environment

  - by jherlitz

  We are running exchange 2007 in a domain environment. We have mostly outlook 2003 clients, but in process of upgrading to outlook 07 over the next couple of weeks. Some users (both 03 & 07) are constantly getting prompted to enter their credentials. The 07 client I was working on this morning states "needs password" in the bottom right corner. It is also speratic, as it will work fine most days but not some other days. The user I was working with this morning, has been working fine. Now it just started up today. I have been googling this, and have found lot's of information, but nothing that has helped yet. A lot of the information out there is for outlook users using a external email account. Being they already logged into the domain, these users should not be prompted for their credentials. Any advice out there?

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• Modifying the install environment for RH-like installations

  - by javanix

  I am trying to modify the basic installation environment (ie, what Anaconda runs in) for a customized CentOS distribution. For the first try, I would just like to modify a few of the splash images. My initial attempt to do this entailed: 1) Mount images/install.img to a directory ~/img/ 2) Copy all files from img/ to ~/tmpimg/ 3) Modify the splash images 4) mkisofs -o ~/final/install.img 5) cp ~/final/install.img back to my ~/cdroot/ folder and remake the iso. However, the generated .img in step 4 doesn't even come close to matching the file size from the original install.img (meaning that install.img must be created in some other fashion using compression), and it fails when I boot my iso. What settings should I be using to make the install.img file? Is there some other technique for modifying CentOS install environments?

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• Adding user to chroot environment

  - by Neo

  I've created a chroot system in my Ubuntu using schroot and debrootstrap, based on minimal ubuntu. However whenever I can't seem to add a new user into this chroot environment. Here is what happens. I enter schroot as root and add a new user.(Tried both adduser and useradd commands) The username lists up in /etc/passwd file and I can 'su' into the new user. So far so good. When I log out of schroot, and re-enter schroot, the user I created has vanished!! There is no mention of that user in /etc/passwd either. How do I make the new user permanent?

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• Using PVLANs with normal VLANs in a trunked environment

  - by user974896

  Assume a trunked environment with two switches, S1 and S2. The swtiches are connected with a trunk port designed to pass VLAN 26. What would happen if VLAN 26 on S2 is configured as a private-vlan with the default gateway and DHCP server and default gateway as promisc ports. What if S1's VLAN 26 is configured as a standard VLAN. Would the hosts on S1 be able to communicate with the promisc ports on S2? Would they be able to communicate with the hosts on S2? To further complicate things what if the DHCP server were to reside on S1 and I wanted S2 to have private VLANS with promisc ports as the gateway and DHCP server while still leaving S1 in a standard vlan configuration.

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• /proc/pid/environ missing variables

  - by Josh Arenberg

  google is giving no love on this one today, so I turn to the experts... I'm currently hacking together a script that relies on the /proc/pid/environ feature in Linux (RHEL 4) to check for a particular environment variable. Trouble is, it seems certain environment variables aren't showing up in there for some reason. Example: create some test vars: $ export T_1=testval TEST_1=testval T=testval TESTING_LONGEST=testval open a subshell: $bash $ cat /proc/self/environ|tr "\0" "\n"|grep testval TESTVARIABLE_LONGEST=testval T=testval hmm... where did T_1 and TEST_1 go?? what rules govern this strange universe? Thanks in advance, Josh

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• emacs AucTeX:Turn off auto-fill-mode inside a particular LaTeX environment

  - by Seamus

  I like using auto-fill-mode for hard line wrapping. However, when I'm making a big tabular in a .tex file, I like using align-current to have the table look somewhat like it would when printed. The difficulty is that if I have a table that is longer than the line width, auto-fill-mode breaks it, and then align-current can't put things to rights and gets confused. Is there a way to tell emacs that when I'm between the \begin and \end tags of a particular kind of environment (in this case, tabular), don't word wrap...

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• SQL server environment

  - by Olegas D

  Hello I'm considering a bit of changes in current sales environment. And trying to check all cons and pros. Current situation. SQL server (quite decent HP server - server1) + backup server (smaller Dell server - server2). all sql files and sql server itself are on the server1. If something goes wrong with server1 I will have to manually move to server2. Connecting to the sql server: 1 HQ (where server located) + 4 sites through VPN. Now I'm considering 2 scenarios: Buy some storage system + update existing servers (add ram, upgrade processors) and go for VMWare ESXI. Rent a server at a datacenter + rent virtual server in case real server goes down. Also rent some space at data storage to keep SQL files there. Have anyone considered these things and maybe found some good pros/cons list? ;) Thanks

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