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• qemu command not running directly

  - by Dr. Death

  Can I use "qemu://localhost/system " command directly inplace of "virsh -c qemu://localhost/system " command if my both machines are physically connected in a network as virsh will simply creating the virtual shell between two systems? can I use ssh in place of virtual shell here? I tried this but system gives no directory or file name for qemu even when i had qemu installed properly in my system. but when i use virsh i did not get such errors. Do i need to open any unix socket for doing this?

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• Does using cat5e cables yield any disadvantages in combination with cat6/cat6a network?

  - by agent154

  If I were to have a fully compliant cat6 or cat6a network running through my walls... that is to say, wires and jacks... What would be the concequence of plugging a cat5e wire into one of the jacks? I'm assuming that it would still run at cat5e standards, but obviously not cat6/6a standards because the whole connection is not cat6. I only ask because it seems silly to me to make a bunch of cat6 patch cables for connections that don't really matter, like standard desktop computers and other equipment. Or will doing so hamper the whole network?

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• Installing Windows 2003 over remote DRAC 4

  - by Delli

  I'm trying to install windows 2003 over a DRAC 4 console session by using a ISO file. But it keeps freezing during the GUI installation then when login back Windows Setup says some files not found and setup won't continue. What's the best approach to install Windows 2003 over a DRAC 4 console session?

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• esxi VM will not connect to virual switch

  - by NitroxDM

  I have a exsi box with a VM (Windows 2003) that will not connect to any of the switches. The switch shows the VM connected but I can not ping anything on the network. I have double checked the VM's IP. No dice. There are a ton of messages in the log: [DATE 'VmMisc' NNNNN warning] Failed to validate VM IP address: unknown Update: There are 3 other VMs. Each vSwitch has 56 ports. I can ping from one nic to the other. Each vSwitch shows that the new VM is connect. VMware ESX Server 3i V 3.5.9 Build 123629 Update 2: Out of the blue it just started working. I didn't change anything. I think it has something to do with RRAS.

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• Excel shortcut: switching back and forth between that last active sheet and the current exit sheet

  - by thomasssssss

  I know the shortcut CRTL + page up/down but I need the similar function that exists eg in internet explorer: Shift + alt I found a macro that is close but does not entirely solve the problem: If ActiveSheet.Name = "To Do" Then Sheets("Budget").Activate ElseIf ActiveSheet.Name = "Budget" Then Sheets("To Do").Activate I can name the A1 cell with the sheet name and use search (f5) and type the name, but this is to cumbersome. Any ideas, guys?

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• How can I install CentOS without a keyboard, mouse, or monitor?

  - by user1032531

  I will be buying a new computer which will be used as a CentOS server. I will put it on my home LAN, and once it is set up, will access it only through SSH. I don't want to spend a lot of money (maybe $500), and I don't want to buy another monitor or keyboard just to through them away after the server is setup. My question is how do I access the computer without a keyboard and monitor when I install the operating system? For media, I can use either the DVD or an ISO on the USB, so am good there. But how do I see what I am doing and enter commands without a monitor or keyboard? I have a Window 7 laptop, an XP laptop, and a CentOS laptop. Can I use one of my laptops to act as the MMI (Man Machine Interface)? If not, what is the easiest and least expensive option? Thank you

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• Clients didn't switch to secondary DNS server during fail over

  - by The Digital Ninja

  I have two internal dns servers set up and all my servers have both of them in the resolv.conf Our main dns server went down and suddenly no server could see each other. I edited a few of the servers resolv.conf manually and committed out the first (down) dns server and that machine would instantly be able to ping again. What did I do wrong, does it not auto switch to the secondary dns server when it times out? # File managed by puppet nameserver 192.168.146.100 nameserver 192.168.159.101 ;nameserver 72.14.188.5 domain example.com search example.com

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• Diagnosing and debugging LAN congestion / connection issues

  - by John Weldon

  What are the top N tools / methodologies used to diagnose and repair network issues? Given a LAN, for example, where users are able to consistently ping an outside server, but any data intensive connections are flaky; how would you begin solving the network issues? I imagine issues like congestion, bandwidth constraints, throughput constraints, etc. are all factors, but I don't know how to diagnose those issues. I'm especially interested in LAN environments (rather than WAN)

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• Switch HTTP Virtual Host to HTTPS Virtual Host

  - by Kumar

  We are using apache web server with RHEL 6.4. Currently we configured Name based virtual host on server. Enabled "Namebased Virtualhost *:80" and created /etc/httpd/conf.d/example-com.conf <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/vhost/example.com/public_html ServerName www.example.com ServerAlias example.com ErrorLog /var/log/httpd/vhosts/example-com-error_log CustomLog /var/log/httpd/vhosts/example-com-access_log common </VirtualHost> I've located my ssl certificates by /etc/httpd/conf.d/ssl.conf In this case how can I switch 80 site to 433 and also redirect all requests to 80 to 443

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• How to install virtio balloon driver in Windows Server 2008 Std x64

  - by javano

  I am trying to run the install command in the INF file that comes on the virtio drivers ISO, after having downloaded devcon.exe from Microsoft's website. I am getting the following error and I don't know how to progress; C:\Users\Administrator\Desktop\ADM64>devcon install BALLOON.inf PCI\VEN_1AF4&DEV_1002&SUBSYS_00051AF4&REV_00 devcon.exe failed. 'DEV_1002' is not recognized as an internal or external command, operable program or batch file. 'SUBSYS_00051AF4' is not recognized as an internal or external command, operable program or batch file. 'REV_00' is not recognized as an internal or external command, operable program or batch file. Thank you.

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• Cloudstack virtual machines can't communicate with virtual routers when they are on different hosts

  - by Jorge Suárez de Lis

  I'm using Cloudstack 2.2.14 on a Ubuntu 10.04 set of hosts, and I have a problem on my setup. I have two hosts running. When a virtual router is created on host 1 and a virtual machine using that virtual router is created on host 2, or vice versa, I have no connectivity at all on the virtual machine. First of all, I have to setup the network manually on that virtual machine -usually DHCP is working, but not here-. Then, I can't ping to the virtual router from the virtual machine or vice versa. When both virtual router and virtual machine are created on the same host, everything works! Maybe those packages are being filtered somehow? I have no clue on how to proceed. Both hosts can communicate directly outside the virtualization.

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• Flexible virtualization infrastructure Design with libvirt

  - by Lessfoe

  I'm going to install a CentOS6 Server with Virtualization ( libvirtd ) capabilities on a DELL Server with Hardware RAID5 of around 6T of disk space ( It has 4x2T disks in a PERC700 RAID Controller ). I'm going then to install some guests which requires few resources except one that needs 500GB of disk space, 8/16GB of RAM and good performances. I was thinking about file images for guests storage but I'm not sure about the 500GB VM what needs good performances so that an LVM device could be better. So my question is what would be the best layout concerning: RAID setup ( RAID5, RAID1 + 1 disk for OS only. ) disk partitioning ( using the entire disk/ leave free space for future use and extending it with LVM ) guests storage management ( LVM devices or file images ( considering the 500GB VM that is performance demanding ) or mixed ) Where to put guests storage? /var/lib/libvirt/images or maybe in a custom dir separated from system /home/VMs Thanks in advance for any hint.

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• Find out which task is generating a lot of context switches on linux

  - by Gaks

  According to vmstat, my Linux server (2xCore2 Duo 2.5 GHz) is constantly doing around 20k context switches per second. # vmstat 3 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 2 0 7292 249472 82340 2291972 0 0 0 0 0 0 7 13 79 0 0 0 7292 251808 82344 2291968 0 0 0 184 24 20090 1 1 99 0 0 0 7292 251876 82344 2291968 0 0 0 83 17 20157 1 0 99 0 0 0 7292 251876 82344 2291968 0 0 0 73 12 20116 1 0 99 0 ... but uptime shows small load: load average: 0.01, 0.02, 0.01 and top doesn't show any process with high %CPU usage. How do I find out what exactly is generating those context switches? Which process/thread? I tried to analyze pidstat output: # pidstat -w 10 1 12:39:13 PID cswch/s nvcswch/s Command 12:39:23 1 0.20 0.00 init 12:39:23 4 0.20 0.00 ksoftirqd/0 12:39:23 7 1.60 0.00 events/0 12:39:23 8 1.50 0.00 events/1 12:39:23 89 0.50 0.00 kblockd/0 12:39:23 90 0.30 0.00 kblockd/1 12:39:23 995 0.40 0.00 kirqd 12:39:23 997 0.60 0.00 kjournald 12:39:23 1146 0.20 0.00 svscan 12:39:23 2162 5.00 0.00 kjournald 12:39:23 2526 0.20 2.00 postgres 12:39:23 2530 1.00 0.30 postgres 12:39:23 2534 5.00 3.20 postgres 12:39:23 2536 1.40 1.70 postgres 12:39:23 12061 10.59 0.90 postgres 12:39:23 14442 1.50 2.20 postgres 12:39:23 15416 0.20 0.00 monitor 12:39:23 17289 0.10 0.00 syslogd 12:39:23 21776 0.40 0.30 postgres 12:39:23 23638 0.10 0.00 screen 12:39:23 25153 1.00 0.00 sshd 12:39:23 25185 86.61 0.00 daemon1 12:39:23 25190 12.19 35.86 postgres 12:39:23 25295 2.00 0.00 screen 12:39:23 25743 9.99 0.00 daemon2 12:39:23 25747 1.10 3.00 postgres 12:39:23 26968 5.09 0.80 postgres 12:39:23 26969 5.00 0.00 postgres 12:39:23 26970 1.10 0.20 postgres 12:39:23 26971 17.98 1.80 postgres 12:39:23 27607 0.90 0.40 postgres 12:39:23 29338 4.30 0.00 screen 12:39:23 31247 4.10 23.58 postgres 12:39:23 31249 82.92 34.77 postgres 12:39:23 31484 0.20 0.00 pdflush 12:39:23 32097 0.10 0.00 pidstat Looks like some postgresql tasks are doing 10 context swiches per second, but it doesn't all sum up to 20k anyway. Any idea how to dig a little deeper for an answer?

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• What's Switched LAN Topology ?

  - by mgpyone

  If somebody can tell me clearly what "Switched LAN Topology"is, it'll be great. I can't even understand what it's due to the following picture . Any answers are most welcome.

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• SSH login to Cisco switch using Rancid times out

  - by Lars

  I have a 3560 switch that I have configured to accept SSH logins, and this works fine. However I cannot get Rancid to complete the login process to any of my switches using SSH. I get a timeout error after a minute or so. Telnet logins work fine with the same username and password. Here is my rancid setup in .cloginrc: add user * {myuser} add password * {strongAccessPassword} {strongEnablePassword} add method * ssh telnet Then, when I run bin/clogin 10.10.1.10 I get: # bin/clogin 10.10.1.10 10.10.1.10 spawn ssh -c 3des -x -l myuser 10.10.1.10 ############################################### Please authenticate. ############################################### Password: Error: TIMEOUT reached Again, when I do this using telnet as my preferred mothod in .cloginrc, it works without issue.

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• If fiber runs 1gig fine, are there any concerns when considering upgrading to 10gig transceivers?

  - by Eric

  We had fiber installed (connecting ~10 buildings) around 5 years ago and it has been working great. The initial setup involved Procurve 2848 and 2824 switches w/ 1gig transceivers. However, lately we have been considering upgrading our network both to increase bandwidth and possibly add VOIP. However, a lot of this is assuming that we can just use pop the existing fiber into 10gig XFP transceivers in better switches and call it a day. If the fiber works fine at 1G does that mean it should be fine for 10gig? If not, how can we confirm that our existing fiber trunks will work, preferably in an affordable fashion?

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• How do you keep track of what's connected to your switches?

  - by Kamil Kisiel

  Currently we manually document the connections to the ports of our switches. Of course, maintenance is a chore, and the documentation is out of date as soon as you save it. Are there any tools for querying switches, preferably via SNMP, that can tell you what is connected on the other end? For the record, we use primarily HP ProCurve switches.

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• Share Keyboard/Mouse between PC (windows?) and Android

  - by kashiko

  Has anyone come across software that can do this successfully/reliably? I would like to set up my Nexus 7 tablet on a stand under my monitor and use it with the mouse/KB hooked up to my desktop so I can continue to use it while using my desktop without having to pick it up. I was able to find one application which claims to do this (PC Loves Android), but reviews on the Google Play store do not seem to favor it.

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• How to switch users without entering password

  - by torbengb

  I'm a newbie running Ubuntu 9.10. I have two users (wife and me), and each user's screensaver is set to lock so that on wakeup, we get to choose which user's desktop to go to. However, Ubuntu requires a password, so this is pretty tedious. I'd like to switch users without entering any password. I know about this trick that works for the boot login, but it doesn't deal with multiple users. Is it possible to set empty passwords for users in Ubuntu, or skip the password in other ways? (I'm expecting real Linux users to suggest that passwordless users must not get any rights and there be an admin user with a strong password. Yes, you're right. But that's not what this question is about. Thanks.)

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• Abnormally high amount of Transmit discards reported by Solarwinds for multiple switches

  - by Jared

  I have several 3750X Cisco switches that, according to our Solarwinds NPM, are producing billions of transmit discards per day. I'm not sure why it's reporting these discards. Many of the ports on the 3750X's have 2960's connected to them and are hardcoded as trunk ports. Solarwinds NPM version 10.3 Cisco IOS version 12.2(58)SE2 Total output drops: 29139431: GigabitEthernet1/0/43 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is XXXX (bia XXXX) Description: XXXX MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:47, output 00:00:50, output hang never Last clearing of "show interface" counters 1w4d Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 29139431 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 35000 bits/sec, 56 packets/sec 51376 packets input, 9967594 bytes, 0 no buffer Received 51376 broadcasts (51376 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 51376 multicast, 0 pause input 0 input packets with dribble condition detected 115672302 packets output, 8673778028 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 pause output 0 output buffer failures, 0 output buffers swapped out sh controllers gigabitEthernet 1/0/43 utilization: Receive Bandwidth Percentage Utilization : 0 Transmit Bandwidth Percentage Utilization : 0

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• Who moved this PC here aka Locate which port on switch a PC is plugged into

  - by ggonsalv

  The catch is you have no SNMP access, not even public. The end vision is locate a PC in building easily even if PC's are moved around. The MAC address of the PC is known and the software would run as client on each desktop, reporting back which port the PC was plugged into. Well from a programmer perspective, my network skills are not the best. Yes I could use SNMP, download the MAC port table, load it into SQL, match it to the PC name. Seems alot of work. Lets say I ping a single point from the PC. Would the echo have some thing unique for each device on the same switch? All I need to identify some thing unique for each PC plugged into each port. If the PC was moved from location A to a different location then the unique response would change.

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• Force10 layer 3 switches

  - by ALQ

  We've been running Cisco and dell layer 3 switches. The former are expensive and reliable, the latter a lot cheaper and fraught with issues. Anyone has positive experience with the core Force10 switches (and edge switches as well)?

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• Boot linux off hard drive and then switch to run from usb flash disk

  - by Jesse

  I have an older laptop that I want to use as a simple media server on my home network. I would like to avoid using the internal hard drive except for booting (BIOS does NOT support booting from USB). My thought was to mirror the hard drive (currently has current install of Arch Linux) onto the flash drive and then after booting switch over to run everything from the flash drive. I read the following article about using a RAM disk (HOW-TO: Boot OS into RAM for speed and silence) but ran into problem because the USB subsystem does not seem to be initialized soon enough (I create root and home paritions on the flash disk and modified fstab to pick those - didn't work). Any thoughts?

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• Web-Based Virtual Machine Manager

  - by Pete Redhead

  I am looking for a web-based virtual machine manager, which will work on our Ubuntu server. Ideally, I need something that our team can use to create a VM, test builds and packaging and then either restore to the original state or delete. libvirt has an API, but I can't find any web apps using it. Thanks

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• How to switch off Outlook Synchronization Manager

  - by mr.nothing

  I have one strange thing which is happening to my outlook. It tries to synchronize something (seems it do this every time send/recieve triggers). Does anybody know how to switch this manager off? Here is the icon of the sync manager in the task bar (left one) https://www.sugarsync.com/pf/D9085558_69411843_95701 Thanks in advance! p.s. it's also annoying me that something gone wrong and sync failed. Also every time it tries to sync something internet explorer says me that there are too many temporary internet files and asking me to expand space for its storing. https://www.sugarsync.com/pf/D9085558_69411843_95781 Please, help! This makes me crazy.

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