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• How can I tell if a host is bridged and acting as a router

  - by makerofthings7

  I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is configured correctly. What IP, ICMP, or SNMP (etc) tricks can I use to poll the hosts and determine if the host is acting as a router? I'm assuming this test would presume I know the target IP, but in a large network with many subnets, I'd have to test many different combinations of networks and see if I get success. Here is one example (ping): For each IP in the DMZ, arp for the host MAC Send a ICMP reply message to that host directed at an online host on each subnet I think that there is a more optimal way to get the information, namely from within ICMP/IP itself, but I'm not sure what low level bits to look for. I would also be interested if it's possible to determine the "router" status without knowing the subnets that the host may be connected to. This would be useful to know when improving our security posture.

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• Installing linux on computer with Marvell adapter

  - by Seth

  I recently reinstalled my computer and decided that I want to have a native installation of linux side by side with windows (got tired of VMWare). The thing is upon installation (debian) everything goes fine until the disc detection section - linux can't find my western digital 1TB drive (IDE mode). I don't have the installation disc with me now, but I think that when i changed the mode to AHCI everything worked, though Windows couldn't boot so this is not an option. I have a Marvell 91xx controller. Any ideas?

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• Error 1069 the service did not start due to a logon failure

  - by Si.

  Our CruiseControl.NET service on Win2003 Server (VMWare Virtual) was recently changed from a service account to a user account to allow for a new part of our build process to work. The new user has "Log on as a service" rights, verified by checking Local Security Settings - Local Policies - User Rights Assignment, and the user password is set to never expire. The problem I'm facing is every time the service is restarted, I get the 1069 error as described in this questions subject. I have to go into the properties of the service (log on tab) and re-enter the password, even though it hasn't changed, and the user already has the appropriate rights. Once I enter the password apply the changes, a prompt appears telling me that the user has been granted log on as a service rights. The service will then start will no problems. Not a show stopper, but a pain none-the-less. Why isn't the password persisting with the service?

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• Easiest (free) way to get VM hosting Windows OS, on Windows 7 Ultimate 64bit

  - by John

  I'm a software developer and my workstation is running Win7 Ultimate, 64bit. I want to run a virtual PC on which I can deploy and run the web-software I create, as a virtual web-server PC. I want the VM to also be Windows as that's what I know, the version isn't too important but on that PC I want to run things like MySQL, TomCat, etc. I see VMWare make 'Player', also I see VirtualBox and I know MS also have solutions too, which I've heard good things about. Does it make much difference which I use as far as creating & using VMs? Or are they all pretty similar?

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• my.ini optimization on Windows 2008 R2 VPS

  - by MKphpDev

  I have a vmware VPS running Windows Server 2008 R2 Enterprise that has performance issues with MySQL. Every few minutes, MySQL stall for few seconds then responed to queries. I'm sure that my.ini need to be optimized, but unfortunately, I don't have any idea of my.ini configuration. What's running on the server: 2 small wordpress blogs, 1 vbulletin forums (approx. 1.2 GB database, and increasing), small database for some sort of plug-ins (no more than 4000 records) Server Info: Processor: Intel Xeon X5550 @ 2.67GHz, RAM: 6 GB (memory useage never exceeded 2 GB), MySQL 5.5, PHP 5.3.10, IIS 7 current my.ini: [mysqld] default-storage-engine=INNODB sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE _USER,NO_ENGINE_SUBSTITUTION" max_connections=250 myisam_max_sort_file_size=20G innodb_additional_mem_pool_size=256M innodb_flush_log_at_trx_commit=1 innodb_log_buffer_size=8M innodb_buffer_pool_size=512MB innodb_log_file_size=128M innodb_thread_concurrency=10 key_buffer_size = 512M myisam_sort_buffer_size = 8M join_buffer_size = 256K read_buffer_size = 256K sort_buffer_size = 256K table_cache = 4000 thread_cache_size = 200 wait_timeout = 30 connect_timeout = 10 tmp_table_size = 32M max_allowed_packet = 1M max_connect_errors = 10000 query_cache_size = 16M query_cache_limit = 2M query_cache_type = 1 query_cache_min_res_unit = 1024 query_prealloc_size = 16384 query_alloc_block_size = 16384 skip-external-locking read_rnd_buffer_size=1M max_heap_table_size=16M thread_concurrency=8 [mysqld_safe] open_files_limit = 8192 [mysqldump] quick max_allowed_packet = 16M [myisamchk] key_buffer_size = 128M sort_buffer_size = 128M read_buffer = 2M write_buffer = 2M any help with that, please?

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• How can I fully automate the creation and configuration of a SharePoint virtual machine?

  - by vnat

  I typically require multiple SharePoint virtual machines for development purposes. I currently manually build these every time I need one, either starting from a fresh OS install or using sysprep when working with SharePoint 2010 and SQL Server 2008 R2. I currently use VMWare, but am open to VirtualBox or Hyper-V. I'd like to be able to go from zero to a working VM with SharePoint, SQL and Visual Studio all through script. Is this a feasible task? Or are there more practical methods which would start from a VM with a fresh installation of an OS, and then use more standard unattended installs. Although general, I'd like to know which direction to focus my efforts. Thanks in advance, vnat

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• Cannot connect Solaris 10 to Windows 7

  - by user999353

  I'm trying to connect a Solaris VM (powered by VMware Player) to Windows Explorer in Windows 7. When I try to map the network drive I get the following: The specified server cannot perform the requested operation. I am using the following URL which has worked on a machine I used before. The only thing that has changed is the IP address of the Solaris machine. I am able to connect to the VM via putty. \\1.2.3.4\xxx\yyy I checked and I think samba is running.. root 375 1 0 09:53:39 ? 0:00 /usr/sfw/sbin/smbd -D root 376 375 0 09:53:40 ? 0:00 /usr/sfw/sbin/smbd –D Anyone any ideas?

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• Recommended laptops for system admins?

  - by 80skeys

  Hey all - I'm in the market for a new laptop and wanted to get some recommendations. I'm a Linux sysadmin and this laptop is primarily for work related use, working from home, after hours, occasional trips to the data center, etc. We all know the drill. My typical setup includes various utilities and tools plus multiple partitions for booting different OS's including VMware. Need serial port of course, DVD-RW, and all the usual stuff we use in our daily routine. I'm kinda thinking a Thinkpad T510 but open to other suggestions! Brief explanation of why you suggest some particular brand and configuration is appreciated.

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• Running Ubuntu off a USB drive?

  - by Solignis

  I was wondering if a USB 2.0 Thumb drive has enough bandwidth to act as a primary system drive in an Ubuntu Linux server. More specifically an SAN server. I am running an iSCSI target, ZFS and NFS-kernel-server, BIND9 (Slave), and Openldap (Slave). I was thinking of resorting to a thumb drive because my new motherboard only has 4 SATA ports and I have 5 disks. 4 (ZFS Pool) 1 (System). And unless I get an expansion card there is no way to get more SATA ports. This "server" leans more twords a home server. I use in my lab with my VMware server. It provides storage, or atleast it did until it died. Would it still be better to go with the SATA hard disk?

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• Slow network file copy on Windows 7

  - by Jason V.

  I wrote a program that uses xcopy to transfer files (usually between 1KB and 2MB) over our intranet. Usually, I am copying files from my host machine (Windows 7 x64) to a VMWare virtual machine running Windows Server 2008 (the VM is running on my host machine, if that matters). On Windows XP, the file transfers usually only require a few seconds to complete. But on my Windows 7 machine, the transfer of the first file (1.5 MB) takes around 1.5 minutes to complete. This is true whether I use xcopy, robocopy, or programmatically using File.Copy(). I noticed that if I use File.Copy, the first transfer is very slow and subsequent transfers are much faster. Any clue how I can speed up the process? Is there a setting in Windows 7 (or server 2008) that I could try?

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• Timing startup processes?

  - by acidzombie24

  My Windows 7 use to boot up fast and now its getting rather slow. I suspect one program is eating up all the time yet i cant tell what it is since task manager shows <40% of the cpu being used. What can i use to track how long each process takes when my computer boots/starts up? Note: Except for launchy which i used before my comp became slow, all my startup and services are all signed and known (broadcom, VMWare, Google Inc, Intel, etc) Note2: I am mostly considering the time it takes after i login but i suspect the time before that is slightly slower (i dont think very much though)

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• Windows 8 freezes on startup when intel VT-d is enabled

  - by John Nevermore

  I don't know what to make of this situation: Windows 8 freezes after about 3 seconds after booting to the log in screen. The only way i have been able to avoid the freeze, is if i set VT-d disabled VT-d enabled, but Nvidia drivers uninstalled (running on integrated graphics) VT-d enabled, Nvidia drivers installed, Hyper-V feature enabled My goal is to get Windows 8 running with VMWare (ie. Hyper-V has to stay disabled), VT-d and the latest NVidia drivers. Specs: 32 GB of ram Intel Core i7-2760QM NVidia Quadro 1000M Intel 520 SSD 480GB Maybe somebody has experience with this kind of a situation ?

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• Safely resizing partitions in CentOS 6

  - by Fariborz Navidan

  I have deployed two VMs on VMware with CentOS 6.3 Net Install. It has automatically created some partitions. It has created two major partition for root and home. root partition has size of 50GB and home 168GB. root partition has 35GB of free space. I want to resize partitions safely without data loose. server is running CPanel and home partition has important user data. I want to reduce root size and increase to home. home partition has only 7GB used. Please advise the safest way

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• Does Citrix XenServer have storage Migration [closed]

  - by Entity_Razer

  I'm trying to find out. I can't seem to find a defenitive yes / no answers so I thought I'd ask the ServerFault community this simple question: Does XenServer (in any version) support Storage migration such as VMWare's Storage VMotion capability, or Hyper-V's storage migration ? I'm trying to do a comparative study of all platforms but I can't find a website (preff. Citrix supported or any other "legit" source) where it say's a defenitive yes or no. Anyone able to answer this one for me ? Cheers !

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• Are Oracle Database CPU license limits enforced by software, and how do I check them?

  - by DrStalker

  I've inherited a windows VM running Oracle Database 10g. Currently the VM has only one CPU assigned to it, but I can boost this up to 4 with our VMWare licenses. What I'm not yet certain about is if the Oracle Software will get upset. Are Oracle DB CPU limits enforced by software, and if so how do I find out what they? If it's just a legal enforcement I'll hunt through the mass of unsorted paperwork I have left from previous managers to find what we're licensed for, but a quick software check would be nice.

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• Understanding RAM usage on Linux

  - by stebbo

  I'm completely new to Linux and I'm just trying to understand where all my RAM is going. I've got a pretty fresh install of Xubuntu running as a VMWare guest, and I've given it 1.5GB RAM to play with. After only running two apps starting up Tomcat servers and also running Firefox, I've got hardly anything left. 160MB according to free -m. Looking at the output from Top, I see Java appearing twice, each stealing about 1/2 Gig resident memory. Both Tomcat instances use the same jdk, I would have thought I'd only see Java there once. What's the story? I had a screenshot but unfortunately couldn't post it being under 10 rep. Update The free -m output requested: total used free shared buffers cached Mem: 1419 1380 39 0 8 111 -/+ buffers/cache: 1259 160 Swap: 509 68 441 Top (coming)

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• Asus V1S, no video signals but boots ok

  - by user52441

  Hey folks! I got a mayor problem with my 3 year old my Asus V1S notebook. After installing VMWare Player an rebooting the screen remained black and there was no POST screen. Also the other video outputs - VGA and HDMI - send no signals. However the maschine boots into Windows 7 properly (sounds waren played) and I can log in by blindly typing my pw. Testend WIN-P and functiom keys but no luck with that. Google is no help here, thats why I basketball you superusers! Please give me hints if you have any idea or if you experienced a similar problem. Thank you so much!

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• How to save your Linux state (suspend to disk) periodically to recover from crashes?

  - by WoLpH

  One in a while my laptop crashes/dies because of a bad/empty battery, crappy wifi driver or whatever other reason. For a while I've wondered if it's possible to force Linux to periodically save the state (like vmware snapshots) to disk so you can restore from that with possibly slightly outdated work but at least with all of your apps open in the same state you've left them. I don't really see the point in having to boot everything from cratch constantly, although KDE saves your state on logout, that doesn't happen periodically (by default) either. It would make it much nicer to recover from your crashes if your ram was written to disk periodically. Anyone know if there's a system call to do this without also shutting down the machine? Even a manual button to save the entire state would be nice.

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• CentOS I/O blocking flushing dirtypages

  - by user3662224

  I have an Apache webserver on CentOS. It is not doing anything fantastic or complicated at all but it does at intervals experience a high load (120 for 4 CPUs) for some reason. During this time I see high waits and write durations. I have narrowed this down to flushing of dirtypages to disk to make room for new data. I have tried many things and talked to the developers who are also puzzled by this. I am stumped. Details: vmware virtual guest server 4 cpus 12G RAM Apache PHP I have 40 servers in this cluster that share the same disk structure. Only the webservers are experiencing this issue. Any ideas?

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• Hosting ESXI (free edition) [closed]

  - by Peter Adss

  We currently have one physical server running the free version of VMWare ESXi that virtualizes a Win SBS 2003 server and a Citrix server. We need to collocate the server and are investigating our options. Are there places that will host our virtual servers and save us the expense of shipping the physical server out for collocation. In my mind we'd copy the Vms to disk and ship them out. Does the fact that we're using the free version of ESXi create a barrier to this idea? Thanks for the help, I realize this is a stupid question.

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• Open Source or Low Cost Layer 7 ("Content") Switch?

  - by Rob

  I have several web servers that host a number of different applications and web sites. I want to make it easy to host apps or parts of web sites on different servers (e.g. example.com/foo might be on one physical server and example.com/bar might be on another). We do this Apache redirects right now, but that gets messy fast and in any case we have other problems we want to solve, such as throttling requests from individual clients, and reducing dependency on specific physical hosts. Is there an open source or low cost layer 7 switch that would be suitable for this sort of task? I was hoping to find something like a stripped down Linux VMware guest/appliance built for this purpose, but haven't seen anything suitable out there so far.

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• Is Cassandra production ready for Ruby on Rails?

  - by funkymunky

  I'm working on a project that is considering using Cassandra as a database. We would like to eventually migrate to Cassandra even if we use MySQL to start with, given its scalability. I know that big companies like Facebook, Digg, and recently Twitter is using Cassandra, but I don't believe any of those sites run off Rails. My question is whether or not it's feasible to use Cassandra using Ruby on Rails. Points to consider: We heavily rely on the Authlogic gem. Would switching to Cassandra affect how it works? Are there any mature ruby clients for Cassandra? Looking on Github it seems that fauna's client is the most mature. Has anyone had production experience with it? Appreciate any tips.

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• MySQL Interview Questions

  - by Campbell

  Hi, I've been asked to screen some candidates for a MySQL DBA / Developer position for a role that requires an enterprise level skill set. I myself am a SQL Server person so I know what I would be looking for from that point of view with regards to scalability / design etc but is there anything specific I should be asking with regards to MySQL? I would ideally like to ask them about enterprise level features of MySQL that they would typically only use when working on a big database. Need to separate out the enterprise developers from the home / small website kind of guys. Thanks.

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• Visual SourceSafe: Architecture/Management

  - by Nic

  I was looking for information on how other people with larger teams manage SourceSafe currently. I was looking for recommendations and advice for a new project I was setting up that will allow for a few key things Scalability Manage multiple overlapping releases Geared more around .NET however allows for legacy applications (VB, ASP and VBS) I am really looking for any lessons learned from other teams. I come from a StarTeam background and we used view labels and release labels to manage multiple overlapping projects. View labels geared more towards compiled code and SQL and the revision labels were used for VB/ASP projects. Thank you for any advice and sharing your experience and frustrations with other companies you might have worked with in the past.

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• Choosing between Berkeley DB Core and Berkeley DB JE

  - by zokier

  I'm designing a Java based web-app and I need a key-value store. Berkeley DB seems fitting enough for me, but there appears to be TWO Berkeley DBs to choose from: Berkeley DB Core which is implemented in C, and Berkeley DB Java Edition which is implemented in pure Java. The question is, how to choose which one to use? With web-apps scalability and performance is quite important (who knows, maybe my idea will become the next Youtube), and I couldn't find easily any meaningful benchmarks between the two. I have yet to familiarize with Cores Java API, but I find it hard to believe that it could be much worse than Java Editions, which seems to be quite nice. If some other key-value store would be much better, feel free to recommend that too. I'm storing smallish binary blobs, and keys probably will be hashes of the data, or some other unique id.

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