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  • Terminating multi-mode fiber

    - by murisonc
    I'm looking at the feasibility of terminating multi-mode fiber connections ourselves. We would be using LC connectors. I've done some research and found two different methods. One requires polishing the ends and using epoxy while the other doesn't. I like the idea of not having to polish the ends but there doesn't seem to be much information on quality or ease of use. I've found two vendors (3M and Corning) that offer kits for terminating fiber without polishing or using epoxy. Does anyone have any experience with both methods that can offer some advice? Copper is easy but fiber seems to be a whole different animal. EDIT: After looking into fusion splicing suggested in the answer I've determined it's not for us. It's my understanding that is primarily used for outside plant and is better suited for single mode fiber. It's a good answer but doesn't address the question directly. Some more information about our situation. We will only be terminating multi-mode fiber inside a building and only doing between 4 and 20 pair a year. Hiring an outside person won't work due to our location. There are currently a couple people on-site that can terminate fiber (working for another company and charging large fees) but they can only do ST and SC connectors and we only use LC. So once again does anyone have experience with terminating using both epoxy type connectors and the other type (similar to Corning Unicam)?

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  • About Load average in htop, how to decide if it's still doing ok?

    - by Joe Huang
    I use 'htop' to monitor my web server. It's recently quite loaded and the Load average is showing something like this: Load average: 3.10 2.56 1.63 I searched the web about these numbers and I found an article about it: http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages In the article, it says if I have 2 CPUs, 2.0 means 100% CPU utilization. And my VPS has two CPUs, so what does 3.1 mean? How could it exceed 100% CPU utilization? And from these numbers, does it mean I should be wary about the loading now? But the performance seems totally fine, and this is a managed VPS, the hosting company has not notified me any warning about it. During day time, Load average always show these high numbers... here is another snapshot while writing. Load average: 3.03 2.77 1.97 Load average: 0.41 1.29 1.60 <---- 5 more minutes later So I am wondering how much room left for this site to grow in current configurations? What kind of proactive actions I should take in advance? I don't want to wait until the server bursts. Thanks.

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  • Need troubleshooting advice for intermittent dns problems with requests on isp nameservers

    - by Mnebuerquo
    I've been having some intermittent dns problems with a web server, where certain isp's dns servers don't have my hostnames in cache and fail to look them up. At the same time, queries to opendns for those hostnames resolve correctly. It's intermittent, and it always works fine for me, so it's hard to identify the problem when someone reports connectivity problems to my site. My website is on a server running linux with Plesk. My dns records are configured with plesk (so my server is its own dns master). Domain name is registered with godaddy. I'm not real knowledgeable about dns, so I don't really know how to begin with troubleshooting. I've started learning to use dig, but while I can read the manpage to learn the syntax, I don't really know what questions to ask. Since the problem is intermittent I haven't been able to really catalog many symptoms. Symptoms I have observed: Certain people repeatedly reported intermittent problems connecting to my website. This was only from certain networks. (Ex: One guy could connect reliably from his office but not his home.) Sometimes I notice my browser taking a long time looking up the hostname for my site (Firefox shows a message in the status bar at the bottom). For me this is in the ten second range. ssh connections from anywhere to my server take a long time to connect but then seem to work fine once connected. So hopefully the folks on serverfault can point me to a good beginner tutorial for understanding dns, and suggest troubleshooting questions to ask next time one of my users reports connectivity problems.

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  • How to verify a self-signed certificate from another server using openssl?

    - by ntsue
    I am new to openssl and I am having some trouble verifying (from a client machine) an ftp server using ssl with a self-signed certificate. I generated the .cer file by going to my server in IIS and exporting the certificate without the private key. I believe that this is all that I should need on the client side, right? I use the following code to verify the certificate openssl verify ftp.cer and the error that I get back is error 20 at 0 depth lookup:unable to get local issuer certificate I tried this as well: openssl verify -CAfile ftp.cer ftp.cer but received the same error. From what I understand about SSL, this is happening because I have no chain of trust that connects to this server. By default, openssl did not install any trusted CAs and this is fine. I would just like to tell it to trust this server. I tried various tutorials telling me how to add a certificate authority, including this one here, however the instructions are for linux and include adding a symlink and I am trying to do this in windows. If anyone could provide any guidance on how to do this, or enlighten me if I am not understanding something correctly, I would greatly appreciate it. Thanks!

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  • How to set up QoS on ADSL router (terracom) for prioritizing browsing

    - by DBZ_A
    I want to configure the ADSL router which connects 10+ machines to the internet. I want to give maximum priority to browsing (ports 80,443) and set low priority for bittorrent etc.(port 42180) I have been experimenting with settings , but with no luck. There are three settings which confuse me, along with my understanding. 802.1 Priority - Related to LAN level, possible values 0-7 , higher numbers means higher priority. 'Mark traffic priority' - clueless about this. IPP/DS - IP Precedence - possible values 0-7 ; 6 & 7 are reserved, so set 5 for highest priority. Or when using DSCP - set 46 for highest priority. Please help me in getting this done... Similer question for another model of router here , but with less number of confusing options :) How to configure QoS on home router Update: from discussion on another thread, QoS can control only upstream traffic (from router to the internet) , while this may in turn affect downstream traffic rate, there is no direct control over data coming into the router.

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  • Setting up HTTPS across multiple servers

    - by JohnyD
    I'm looking to offer our online services over https and I'm having a couple of problems understanding how to accomplish this. To access our services you must pass through our ISA firewall to a Win2000 server running IIS6. About half our services are located here and the other half take you to a Win2003 server also running IIS6. So, in order to achieve this must each server have the proper certificate installed? ISA, IIS6_1 and IIS6_2? Is there a separate configuration that must be made to our ISA firewall? The other problem is with the CA and knowing how many certificates I need. It's important to note that the domain name for our services on IIS6_1 is www.domainname.com but the domain name on IIS6_2 is services.domainname.com. I believe that this will require me to purchase more than one certificate. It looks as though we will be going with Thawte's SSL123 as it's a good name and it's fast to get. Will I need to purchase 2 certificates (one for www that will be installed on our ISA firewall as well as IIS6_1, and one for services.domainname.com on IIS6_2)? Or will I need to purchase 3, the extra one being used on our firewall server? Another side question is about SAN's (subject alternative names). Is this basically adding sub-domains to your cert? So I could purchase one cert with 1 SAN for my www and services.? Thanks a lot for your help! Please let me know if I can provide any further information.

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  • Excel file growing huge (>150 MB)

    - by Josh
    There is one particular Excel file that is used by a number of employees at my company. It is edited from both Excel 2003 and 2007, with the "Sharing" feature turned on to allow multiple writers at once. The file has a decent amount of data on several sheets with some basic formatting, and used to be about 6MB, which seems reasonable for its content. But after a few weeks of editing, the file grew to 10, then 20 MB, and eventually skyrocketed to more than 150 MB, even though it still has about the same amount of data as before. It now takes 5-10 minutes to open it, and that much time again to save it. The first time this happened, I copied the content of each sheet into a new, blank workbook, and saved the new workbook; this brought it back down to about 6MB. Now, it has blown up again. The workbook uses the "Data Validation" feature to limit the values in certain columns to the contents of a few named ranges. Copying all the data into a new workbook means re-setting up all the data validation, which is a pain and not something that we want to do every month. As a troubleshooting step, I tried saving the file in "XML Spreadsheet 2003" format, hoping to get some insight into what was being stored. Sure enough, the file was almost a gig, and almost all of the 10 million lines look like this: <NamedCell ss:Name="Z_21D5114F_E50C_46AC_AA4F_C3FF540C717F_.wvu.FilterData"/> <NamedCell ss:Name="Z_1EE2BA5E_3011_4F9A_8ACD_E58835250FC4_.wvu.FilterData"/> <NamedCell ss:Name="Z_1E3BDCEA_6A72_4ECC_BF4F_7B03CC66181E_.wvu.FilterData"/> I've seen a few VBScripts online to manage and enumerate named cells that are hidden in Excel's built-in interface, though I wonder how they'd handle my 10 million named cells. What I really need, though, is an understanding of why this keeps happening. What actions in excel could be causing this?

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  • Multiple PHP SAPI configuration

    - by DTest
    I'm trying to build PHP for use as an apache shared module --with-apxs2 but also with the 'php-cgi' binary (fastcgi) on Mac OSX 10.6. I'm using this ./configure : /configure --prefix=/usr/local/PHP \ --with-apxs2=/usr/local/apache/bin/apxs \ --disable-ipv6 \ --enable-cgi \ --with-curl \ --with-mysqli=/usr/local/mysql/bin/mysql_config \ --with-openssl=/usr \ --enable-ftp \ --enable-shared \ --enable-soap \ --enable-sockets \ --enable-zip \ --with-zlib-dir It builds the apache php5.so module just fine, but in /usr/local/PHP/bin, there is no php-cgi file. If I build it without the --with-apxs2 option (and indeed, I don't even need the --enable-cgi option) the php-cgi file gets built with no problems. Background on my setup: PHP 5.3.4, Apache 2.2.14, Mac OSX 10.6, Tomcat with JavaBridge (which is why I need the php-cgi file) Without the apxs2 option, /usr/local/php/bin/php -v produces: PHP 5.3.4 (cli) (built: Dec 21 2010 21:35:14) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies and /usr/local/php/bin/php-cgi -v produces: PHP 5.3.4 (cgi-fcgi) (built: Dec 21 2010 21:35:12) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies My question is, what am I not understanding with php SAPIs that won't allow the building of the two modules at the same time? Also, can I build it --with-apxs2 the first time, then make clean and rebuild in the same PHP directory /usr/local/php for the php files without issue?

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  • httpd.config Easy Apache WHM CentOS

    - by jessie
    First let me explain how I got to this situation. I run a Streaming Video Site. Videos are about 100-250MB in size at any given time there are 500 people on the site. So I guess that would make then static. Recently My site started getting really slow and the only way to fix it temporarily was to restart apache. Now there was no change in traffic that could have caused this. My site is not being attacked. My hosting company recomended to implement mpm_mod and suPHP. They did that by using Easy Apache in WHMS. Then everything was working fine but a little slow. I researched around and to my understanding that mpm will do that but be more table. I was told that installing FastCGI would speed things up just enough. Well that made everything worse. The site is slow and time's out. I used WHM and took off fastCGI but its still the same, it seems like everything i do as of now nothing changes. I even did a roll back on the htconfig file but that didn't work. I'm not sure how to fix this. and my hosting network guy wont be able to touch the problem until Tuesday. I have root access.

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  • Http-Only cookies in WebLogic: what versions support them/how and why are they supported?

    - by John
    We want to make all cookies set by our webapp http-only. I only have a basic understanding of the benefits of doing this but I'm told by security people that it's a Good Thing (tm) Our app is running under JDK1.6.05 and WebLogic10.3.0 After way too much digging around Oracle's website for documentation, I've found good evidence that the first version of WebLogic to support http-only cookies is 10.3.1. By "support," I mean the cookie-http-only deployment-descriptor element. Before we go about upgrading, I'd be nice to have these questions answered: 1a) Is it accurate that WL10.3.1 is the first version to support http-only cookies and that we're out of luck with 10.3.0? 1b) If we do indeed need to upgrade, is there an easy to do so under Windows? I've heard people mention an "upgrade jar" that you just stick in the classpath but I can't find any mention of this by Oracle. Does an easy way exist, or do we need to do a full-install of the new version? 2) What does the cookie-http-only deployment-descriptor element do when enabled? Will it ensure all cookies set by the application have an http-only=true attribute? Will it do more or less? Is there anything I'll have to do programmatically? 3) Is there anything in general I should know about http-only cookies, getting my web app to take advantage of them, or other security concerns?

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  • How to Refresh or Reset Windows 8 without the System Reserved partition?

    - by Karan
    The article Refresh and reset your PC mentions exactly what happens during the refresh and reset operations in Windows 8: Refresh The PC boots into Windows RE. Windows RE scans the hard drive for your data, settings, and apps, and puts them aside (on the same drive). Windows RE installs a fresh copy of Windows. Windows RE restores the data, settings, and apps it has set aside into the newly installed copy of Windows. The PC restarts into the newly installed copy of Windows. Reset The PC boots into the Windows Recovery Environment (Windows RE). Windows RE erases and formats the hard drive partitions on which Windows and personal data reside. Windows RE installs a fresh copy of Windows. The PC restarts into the newly installed copy of Windows. It is my understanding that Windows RE (Recovery Environment) is included as part of the System Reserved partition created by default on the first hard disk. The size of this partition has gone up to 350 MB from the 100 MB it used to be in Vista/Windows 7, no doubt as a result of adding these features. Now we have already discussed how to skip the creation of this System Reserved partition during Setup. Basically, the same techniques that used to work with Windows 7 work with Windows 8 as well. What I want to know is, what will be the exact repercussions of not having the System Reserved partition in place? I assume Troubleshoot / Advanced options should still be available as before: But what about the Troubleshoot menu itself? Will the Refresh and Reset options disappear? Will they remain but be unavailable? Or possibly they will throw an error if selected? Also, will it be possible to access and successfully execute these options if installation media is available? Anything else that might be affected?

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  • Pitfalls to using Gluster as a home/profile directory server?

    - by Bart Silverstrim
    I was asking recently about options for divvying up access to file servers, as we have a NAS solution that gets fairly bogged down when our users (with giant profiles, especially) all log in nearly simultaneously. I ran across Gluster and it looks like it can cluster different physical storage media into a single virtual volume and share it out like a virtual NAS from the client perspective and it support CIFS. My question is whether something like this would be feasible to use for home and profile directories in an active directory environment. I was worried about ACL's, primarily, as I didn't think CIFS was fine-grained enough to support NTFS permissions and it didn't look like Gluster exports those permission levels, just the base permissions for basic file sharing. I got the impression that using Gluster would allow for data to be redundant across multiple servers and would speed up access to the files under heavy load, while allowing us to dynamically boost storage capacity by just adding another server and telling Gluster's master node to add that server. Maybe I'm wrong with my understanding of it though. Anyone else use it or care to share how feasible this is?

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  • If I scp a file through an intermediate server, is the file stored temporarily on the server?

    - by Blacklight Shining
    For the sake of simplicity (I find it easier to remember names than arbitrary letters), I will dispense with letters and use names to refer to the machines in this scenario. Say I have two machines, applejack and pinkie-pie, each on their own separate LANs and not in the same physical location. I also have a server, cadance, with a direct Internet-facing connection. I want to copy a file from applejack to pinkie-pie, so to avoid dealing with port forwarding and such, I set up an ssh tunnel from pinkie-pie to cadance (ssh -R etc cadance). Now I can connect to pinkie-pie from anywhere, by connecting to cadance and specifying an alternate port to use. I can also easily copy files to pinkie-pie with scp -P $that_port $some_file cadance:$some_path. My understanding of how it works is this: A secure connection is made from applejack to cadance I am authenticated to cadance A secure connection is made from applejack to pinkie-pie that spans the existing reverse tunnel and the new connection from step 1. I am authenticated to pinkie-pie Files are copied directly from applejack to pinkie-pie over this connection. Am I correct here? How secure is this approach? If I'm wrong…are files copied this way decrypted at cadance before being passed on to pinkie-pie? Is there a possibility that traces of unencrypted data could remain on cadance?

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  • How to get my W2003-server (back) into the web (after setting up bridged networking)

    - by MBaas
    I have recently set up Virtualbox on a W2003-Server (which is also used as webserver, accessed from the web). My vbox worked nicely, but then I wanted more, I wanted to have the vm appear in the intranet like any ordinary pc. I was advised to setup bridged networking as opposed to NAT. I did so, and in the server's network connections have bridged the LAN-Connection and the "VirtualBox Host-Only Network" (yes, it says "host only network", but I assure that VBox networking is configured to use network bridge). So now my VM is visible in the intranet and it also has www-accesss, the server can also access the web. The only problem that came up is that the server is no longer accessible from the web. I've traced an HTTP-Request and it says "Can't connect to *:80 (connect: No route to host)". So maybe something in the router's config needs to be adjusted (yeah, well, the server's IP-Address changed from 192.168.1.199 to ...198). So I went into the router-config, reviewed port-forwarding for port 80 and adjusted the IP there, but it still didn't work. Unsure if it was a router-problem or rather something in the server's config, I've setup a "demilitarized zone" in the router and have put the server into it. (My understanding is that this would put the server straight into the web...) But the result of the HTTP-Requests is still the same :(

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  • Internal and External DNS from Different Servers, Same Zone

    - by Shane
    Hello All, I am either having trouble understanding how DNS works, or I am having trouble configuring my DNS correctly (either one isn't good). I am currently working with a domain, I'll call it webdomain.com, and I need to allow all of our internal users to get out to dotster to get our public DNS entries just like the rest of the world. Then, on top of that, I want to be able to supply just a few override DNS entries for testing servers and equipment that is not available publically. As an example: public.webdomain.com - should get this from dotster outside.webdomain.com - should get this from dotster as well testing.webdomain.com - should get this from my internal dns controller The problem that I seem to be running into at every turn is that if I have an internal DNS controller that contains a zone for webdomain.com then I can get my specified internal entries but never get anything from the public DNS server. This holds true regardless of the type of DNS server I use also--I have tried both a Linux Bind9 and a Windows 2008 Domain Controller. I guess my big question is: am I being unreasonable to think that a system should be able to check my specified internal DNS and in the case where a requested entry doesn't exist it should fail over to the specified public dns server -OR- is this just not the way DNS works and I am lost in the sauce? It seems like it should be as simple as telling my internal DNS server to forward any requests that it can't fulfill to dotster, but that doesn't seem to work. Could this be a firewall issue? Thanks in advance

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  • Iterating through folders and files in batch file?

    - by Will Marcouiller
    Here's my situation. A project has as objective to migrate some attachments to another system. These attachments will be located to a parent folder, let's say "Folder 0" (see this question's diagram for better understanding), and they will be zipped/compressed. I want my batch script to be called like so: BatchScript.bat "c:\temp\usd\Folder 0" I'm using 7za.exe as the command line extraction tool. What I want my batch script to do is to iterate through the "Folder 0"'s subfolders, and extract all of the containing ZIP files into their respective folder. It is obligatory that the files extracted are in the same folder as their respective ZIP files. So, files contained in "File 1.zip" are needed in "Folder 1" and so forth. I have read about the FOR...DO command on Windows XP Professional Product Documentation - Using Batch Files. Here's my script: @ECHO OFF FOR /D %folder IN (%%rootFolderCmdLnParam) DO FOR %zippedFile IN (*.zip) DO 7za.exe e %zippedFile I guess that I would also need to change the actual directory before calling 7za.exe e %zippedFile for file extraction, but I can't figure out how in this batch file (through I know how in command line, and even if I know it is the same instruction "cd"). Anyone's help is gratefully appreciated.

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  • How to configure VirtualBox server for performance at home

    - by BluJai
    I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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  • How use DNS server to create simple HA (High availability) of my website?

    - by marc22
    Welcome, How can i use DNS server to create simple HA (High availability) of website ? For example if my web-server ( for better understanding i use internal IP in real it will be other hosting companies) 192.168.0.120 :80 (is offline) traffic go to 192.168.0.130 :80 You have right, i use bad word "hight avability" of course i was thinking about failover. Using few IP in A records is good for simple load-balancing. But not in case, if i want notice user about failure (for example display page, Oops something is wrong without our server, we working on it) against "can't establish connection". I was thinking about setting up something like this 2 DNS servers, one installed on www server Both have low TTL on my domain, set up 2 ns records first for DNS with my apache server second to other dns If user try connect he will get ip of www server using first dns, if that dns is offline (probably www server is also down) so it will try second NS record, what will point to another dns, that dns will point to "backup" page. That's what i would like to do. If You have other idea please share. Reverse proxy is not option, because IP of server can change, or i can use other country for backup.

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  • Name resolution not working with ipv6 on centos

    - by jolivier
    I just installed CentOs 6.3 on a server to be installed in a data center, but cannot get name resolution / curl to work. I know this is because of it trying to use ipv6, since ping google.com works, curl -4 google.com works, but not curl google.com. I removed the ipv6 adress from the interface and it does not change anything. This is very problematic since most system tools like yum fail at name resolution currently. Browsers like Firefox work because they might be using another tool for name resolution than the one use by curl. I managed to fix this on workstations by completely disabling ipv6 following tutorials like this one / hardcoding name resolution in /etc/hosts. But since I am here configuring a server which will be later installed in a remote data center, I would like not to mess up, understand what is going on and fix it properly. Besides, I will face the same issue with more servers to come so I would really appreciate your help in understanding this problem and how to solve it. I would be happy to provide more information if needed to help understand what is going on. The current network configuration is a small enterprise network, with a DNS server (let's call it A) configured once a long time ago. dig google.com and dig -4 google.com are both refused by the A DNS. But this is also true for my workstation on which curl is working (and yes they both use the same A DNS server). Indeed this faulty server and my workstation have multiple nameservers in /etc/resolv.conf, and the second one is working fine for both of them, so if I remove A from my resolv.conf everything works fine! Regards, Olivier

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  • Why does USB thumb drive screw up boot sequence?

    - by Carl B
    I am looking for understanding to a boot issue. I have at times had some files and such that I save and retrieve from my thumb drive. I use the front panel as it is nice and easy to get to and I typically power down my system nightly. If I forget to pull the drive and power on the system, it becomes the first bootable device. As there is no OS on the USB Drive I get the BOOTMGR is missing press CTRL+ALT+DELETE. When I go into BIOS to see Boot sequence, there’s the thumb drive up top, DVD drive is missing and not found in the list of devices. All of the hard drives are next in line. When I pull the USB drive, and reboot, everything is back to normal. Old boot sequence is in place, DVD drive right where it should be and no issues. So why does this happen with a USB drive in port at boot up? If it can’t be booted from, shouldn’t the next drive be attempted? Note: This happens when the thumb drive is plugged into a USB port on the front panel. It does not seem to happen on rear panel ports.

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  • Upgrading Visio 2000 to Visio 2007

    - by dirtside
    I have Microsoft Visio 2000 SR 1, and recently purchased Microsoft Office Visio Standard 2007 with the understanding (supported by the product info and some other research) that I'd be able to upgrade. However, when I install 2007, it tells me it can't find a previous install of Visio, but... it's right there! Here's the exact message: "Setup can't find a version of Microsoft Office on your computer. If Office is installed on a disk or network share, click the browse button to select the appropriate disk or share... (etc.)" No matter which directory or drive I pick (various Office installs, the old Visio install, various subdirectories) it gives the following message: "The path you have chosen does not point at a qualifying upgradeable product. Click 'Retry' to try again or 'Cancel' to quit setup." Any ideas? This is a legit copy of Visio 2007 (purchased from Amazon) and the copy of Visio 2000 is legit as well. I'm not sure what exactly the installer is looking for that it would consider a "qualifying upgradeable product". A specific file?

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  • Why should one have a secondary DNS server?

    - by Sam Levin
    I'm very confused. I basically understand how DNS works. Here's an example that helps illustrate what I'm having trouble understanding. Right now, I run a small web-server. I use my provider's DNS manager, so I don't have a DNS server hosted on the machine. Let's say for a second, that I don't use my host's DNS, and I decide to set up a DNS server on my server. Hypothetical scenario: my server (entire) server goes down - DNS included. Why do I need backup DNS? If the server is down, who cares if the DNS server is down too, considering that even if I had DNS up (it wasn't on the crashed server), it wouldn't be able to forward requests anyway since the server would be down? Is the point of having secondary DNS, to be able to change the IP addresses that your DNS server points to, so if your webserver was down, you could redirect traffic to a backup? How would you switch to the secondary provider, in the event that your main DNS provider becomes unavailable? Is a backup DNS system basically up all the time? How is it configured? Is it just an exact clone of the DNS server you would have on your server? Do they run simultaneously? Hopefully someone can see what I'm hung up on, and provide some guidance. Thanks

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  • How can I parse/ transform text log data before it gets captured in SCOM 2007 R2?

    - by Abs
    I'm pretty much a noob with System Center Operations Manager 2007, and I'm probably missing something pretty basic, but I'm stumped anyway. We're setting up monitoring on some of our servers, and we'd like to capture data from some plain text log files (e.g. DNS debug logs, DHCP logs). It looks to me like I can set up a generic text file monitoring rule and get events captured into the main Ops Manager database, but my understanding is that the whole line of text from the plain text log gets captured as one field. In an ideal world, we'd be able to parse or transform that log file data to make it easier to query later. Is this possible? Is it easy? Do I have to buy expensive 3rd-party software to do it? One more thing: it would be even better if there was a way to stuff this data into the Audit Collection Services (ACS) database instead of the main one, but I'll take what I can get. Any help would be greatly appreciated.

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  • how to properly set environment variables

    - by avorum
    I've recently started using Windows (having used Ubuntu up until now) and I find myself unable to properly set environment variables. Whenever I set them they don't seem to work. I've been going to Start-Edit Environment Variables for your Account and editing the PATH value in the upper half of the GUI. Here's what I've got so far. ;C:\Chocolatey\bin;C:\tools\mysql\current\bin;C:\Program Files (x86)\Git\bin;C:\Program Files\MySQL\MySQL Server 5.6\bin\;C:\Python33\Scripts; These are each the parent directories of the executables I'd like to be able to run by name from CMD, but mysql, git, and pip aren't being recognized. Am I doing something wrong syntactically or at a general understanding level? I'd like to be able to run these commands without having to specify the full path to the executables every time. EDIT: The full PATH extracted from CMD PATH=C:\Python33\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\AMD APP\bin\x86_64;C:\Program Files (x86)\AMD APP\bin\x86;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\GTK2-Runtime\bin;C:\Program Files\WIDCOMM\Bluetooth Software\;C:\Program Files\WIDCOMM\Bluetooth Software\syswow64;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\QuickTime\QTSystem\;C:\Program Files (x86)\Common Files\Acronis\SnapAPI\;C:\Program Files (x86)\Java\jre7\bin;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\;C:\Program Files (x86)\MySQL\MySQL Utilities 1.3.4\; ;C:\Chocolatey\bin;C:\tools\mysql\current\bin I'm being forced to use Windows by my work environment, I don't enjoy the state of affairs.

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  • How to configure VirtualBox server for performance at home

    - by BluJai
    I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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