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• No apparent reason for high load average

  - by Oz.

  We have several web servers running on Amazon (ec2) c1.xlarge, over Amazon AMI. The servers are duplicates of each other, running the exact same hardware and software. Each server spec is: 7 GB of memory 20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each) 1690 GB of instance storage 64-bit platform I/O Performance: High API name: c1.xlarge A couple of weeks ago we have run a yum upgrade on one of the servers. Starting on this upgrade the upgraded server started showing a high load average. Needless to say, we did not update the other servers and we can not do so until we understand the reason for this behavior. The strange thing is that when we compare the servers using top or iostat, we can not find the reason for the high load. Note that we have moved traffic from the "problematic" server to the others, which have made the "problematic" server less crowded in terms of requests, and still his load is higher. Do you have any idea what could it be, or where else can we check? Many thanks for the help! Oz. # # proper server # w command # 00:42:26 up 2 days, 19:54, 2 users, load average: 0.41, 0.48, 0.49 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT pts/1 82.80.137.29 00:28 14:05 0.01s 0.01s -bash pts/2 82.80.137.29 00:38 0.00s 0.02s 0.00s w # # proper server # iostat command # Linux 3.2.12-3.2.4.amzn1.x86_64 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 9.03 0.02 4.26 0.17 0.13 86.39 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvdap1 1.63 1.50 55.00 367236 13444008 xvdfp1 4.41 45.93 70.48 11227226 17228552 xvdfp2 2.61 2.01 59.81 491890 14620104 xvdfp3 8.16 14.47 94.23 3536522 23034376 xvdfp4 0.98 0.79 45.86 192818 11209784 # # problematic server # w command # 00:43:26 up 2 days, 21:52, 2 users, load average: 1.35, 1.10, 1.17 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT pts/0 82.80.137.29 00:28 15:04 0.02s 0.02s -bash pts/1 82.80.137.29 00:38 0.00s 0.05s 0.00s w # # problematic server # iostat command # Linux 3.2.20-1.29.6.amzn1.x86_64 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.97 0.04 3.43 0.19 0.07 88.30 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvdap1 2.10 1.49 76.54 374660 19253592 xvdfp1 5.64 40.98 85.92 10308946 21612112 xvdfp2 3.97 4.32 93.18 1087090 23439488 xvdfp3 10.87 30.30 115.14 7622474 28961720 xvdfp4 1.12 0.28 65.54 71034 16487112

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• Windows 2012 RDS Temporary profile for Administrator

  - by Fabio

  I've configured a Windows 2012 RDS Farm with two virtual servers (VMWare - each one on a different ESX server). Both servers have Licensing, Web Access, Gateway, Connection Broker and Session Host roles. High Availability is set up and it works fine. Remote Apps are working and even Windows XP clients have access to the web interface. User profile path is \vmfiles1\UserProfileDisks\App\ and almost everyone has full right access to it. The problem I have is that I would like to be able to access both servers at the same time with the Administrator account (console), but each time I try, the second server that I logon to give me access with a temporary profile. I tried to enable/disable multiple sessions per user and forced Admin logoff with the GPO but nothing changed. Another thing is that the server pool is not saved, so each time I restart the RDS server or I logoff from it, I have to add a server in the server manager. Do you have any idea? Sorry if my english is not perfect.

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• My internet drops and will only reconnect if I troubleshoot it or restart my computer.

  - by Paul

  My internet loses its connection and at the same time, and my speaker seems broken if that happens and my mouse will not be smooth as it was before it happens. It already happened before and I didnt mind it. But now, it's happening literally all the time. After startup, my connection seems okay but after some few minutes, even without me doing something, my laptop will just lose its connection. It says that it is not connected and connections are available, but if I check if there are connections where I can connect it shows nothing. Even if, there is actually a wi-fi connection where my phone and other laptops connect. They dont seem to have problem with it. Just my laptop. After that happens, I usually restart my laptop but I discovered that troubleshooting it would somehow repair the problem, but not all the time. It says that restarting my wireless adapter do the job. Are there any long term fix? I mean that could last long or totally erase the problem? I have Atheros AR5B97 Wireless Network Adapter and Microsoft Virtual WiFi Miniport Adapter, both enabled. On the services, I have Wired AutoConfig and WLAN AutoConfig on Automatic. Aspire 4750, Windows 7 (x86)

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• How does it hurt to use Linux (Ubuntu) as a guest OS for all my tasks?

  - by sauparna

  I have a machine running Windows, where the disk has two partitions C (50 GB) and D (250GB). I do research in Information Retrieval and need to work with a large corpus (more than 50 GB) and in Linux. So if I want to install Linux on the existing system, keeping the Windows installation intact, will it be fine to run it in a virtual box? (say, QEMU, VMWare, etc.) An alternative is using Wubi. In that case the Linux installation has to be on drive C. Then, if I keep a small Linux installation (say 5GB) on C, and my corpus on D (mounted in Linux), how will it affect the performance of my programs which would be accessing the mounted Windows drive D. Is it feasible to use Linux this way? Which of the above is better if at all they are a way out? Note : Since my post in July 2010, I have been using and have tried several ways of maintaining a disk-image that I can mount in Linux. I had a 100GB qcow2 disk and a 100GB raw disk, both formatted to an EXT3 file system. I was mounting and connecting to the qcow2 disk using qemu-nbd. The problem was that every now and then, the connection to the disk would get lost and the running programs would throw disk I/O errors. The raw disk would mount and work fine as a loop mounted device, but when writing data to it, the mount.ntfs program would hog the CPU and the process would take an enormous amount of time. I was in fact running make on a piece of software located on this raw disk, and after a point of time make was waiting while mount.ntfs would show 100% CPU usage.

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• pxe boot dos 7.x / 8.x on modern mainboard without floppy controller

  - by GitaarLAB

  How to pxe boot MS DOS 7.x / 8.x on a modern pc (mainboard without floppy controller) without using an external usb floppy drive? MS DOS 6.22 and earlier or other flavors pxe boot just fine on floppy-less hardware. But DOS 7.x and 8.x renders an error on boot: "Type the name of the Command Interpreter (e.g., C:\WINDOWS\COMMAND.COM) I read somewhere during research this was a rather unknown error, that started to become more common due to the advent of floppy-controller-less hardware. On some hardware (bios dependent) one could plug a usb-floppy-drive in the computer before booting (but that MIGHT also require it to be a "golden floppy drive" (as they where called back then). From a russian site (I read about a year ago and cannot find the hyperlink) MS-Dos versions 6.22 did some-kind of floppy-drive reset during initialization and since it couldn't connect to the floppy-host thus the error. How can I resolve this (without a physical external usb floppy)? Might there be some kind of virtual floppy-driver that could resolve this (for example to be loaded before the dos image loads)? Or could someone point me into the right direction (maybe even a hex-address and some further explanation or something)? I'm using syslinux by the way.

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• how would it be possible to discover a cable modem's MAC remotely?

  - by amateurenthusiast

  i was reading the back archives of a canadian privacy law blog, and he linked to a judicial decision. apparently as part of an investigation in which were used yahoo chat and google's old 'hello' image trading program the officer was able to determine a suspect's modem's MAC address: In order to determine who STEPHTOSH was, the officer did a trace on a programme called WHO IS in an effort to learn from where STEPHTOSH was coming. WHO IS is a command program available to the public. The officer was able to ascertain that the person using the name STEPHTOSH was a Rogers Internet customer. The officer was able to obtain the Internet Protocol address, also known as the I.P. There is only one location for an I.P., which is unique to that subscriber. By use of the website known as DNS STUFF.com, one is able to find with which company this I.P. is registered. It was ascertained that the I.P. address used by STEPHTOSH was registered to Rogers Cable, from the Toronto area. The officer also learned the Cable Modem MAC address used by STEPHTOSH. This was all the information the officer was able to amass. now it was my understanding that the MAC address of any given device can only be accessed if you're only one 'hop' away on the Internet. the suspect in question was in Markham and the officer part of the Toronto Police, so it's conceivable that they both might have used Rogers internet. but would that still put them only one 'hop' away from each other? i thought the first hop after the modem was usually the ISP? and if he'd used a netBIOS query against this guy's machine it would return the ethernet card's MAC, not the modem's. so is this guy on the same rogers subnet as the suspect's cable modem, is that functionality part of google's Hello (i could only think that it would be possible if Hello operated as a virtual LAN or something), does the officer have remote access to the arp caches of the routers at Rogers or is he just full of crap and lying to make his case stronger?

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• Hyper-v on 2012R2 startup gen1 vm causes the host to freeze up

  - by sputnik

  I've searched a lot to resolve the following issue, but nothing helped me. My problem is, that starting up a first-gen vm locks up the whole host. Only a hard reset helps. Second-gen vm starts and runs perfectly. The freezes happened on 3 different vms. FreeBSD, Ubuntu, Windows Server 2008R2, while Windows 8.1 on second gen config works perfectly. Im using this pc mainly as a workstation. No eventlog errors nor dumps are generated. My system: Windows Server 2012R2 FX-8350, non OC ASRock 870 Extreme R2 (Crappy board imho) 32GB DDR3 1866@1600 (My motherboard, against the "support" for 1866ram won't work with full speed) 120GB SSD 4.5TB Storage space device I dont think that its due to my system, because vmware workstation was running without problems. Did I forget to configure something? Any help is appreciated. P.S: Even deactivating C1E, C6, C&Q didnt work. P.P.S: With no virtual network adapter set, the system still locks up. Creating a first gen vm without any hdds and network and launching works. Attaching a boot dvd causes the host to freeze. The host freezes as the gen1 vm begins to boot, doesn't matter if from dvd or hdd

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• Active Directory + IIS + SQL + ASP.NET

  - by Amira Elsayed Ismail

  I have sent the following question to stackoverflow website I have installed Windows server 2008 r2 on a virtual machine, Can I install Active directory with domain controller + IIS + SQL server on the same machine? I want to make web application and this web application will authenticate users from Active Directory, the web application should be published on the server IIS and the users should access it remotely from their home using domain name of my machine, Someone tell me that its very wrong to have IIS and Active directory on the same machine I got the following Answer You can't use ActiveDirectory over the internet. At least not without something like a VPN as a middle man. Their home computers will not be joined to the domain, so there is no pass-through authentication. Yes, it's a bad idea to put AD on the web server. Why is too complex to get into in an answer here. Suffice it to say that even if you did do this, it's probably would not work the way you are thinking it should. It's not impossible to do this. For instance, many of the Microsoft "Small Businesss" products put IIS, AD, and SQL Server on the same server. But, you kind of have to know what you're doing to configure it securely. Then I add the following comment Thanks for ur reply.so what you think about the best way to do this as I didn't do anything like that before should I install active directory on a machine and IIS on another machine ? and what about SQL should I add it to the same server of active directory ? I didn't mentioned also that it will be Microsoft dynamics server that will access some information about work and i have to read data from axapta also ? also what is VPN and how can I use it to let users access my web application anywhere ? Sorry for my long questions and thanks in advance so please if anyone can help I will be thankful

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• Cannot Access Shared Folder From IIS

  - by Tim Scott

  From IIS I need to access a folder on another computer. Both servers are Window 2008 SP2, and they live in a Virtual Private Cloud on Amazon EC2. They reach one another by private IP -- they are in WORKGROUP, not a domain. I can access the shared folder manually when logged in to the client as Administrator. But IIS gets "access denied." Here's what I have done: Set File Sharing = ON Set Password Protected Sharing = OFF Set Public Folder Sharing = ON Shared the folder Added permission to the share: Everyone, Full Control Added permission to the share: NETWORK SERVICE, Full Control Verified that File & Printer Sharing is checked in Windows Firewall Opened port 445 to inbound traffic from local sources I tried adding <remote-machine-name>\NETWORK SERVICE to the share but it says it does not recognize the machine, which makes sense, I guess. As I said, from the other computer I have no trouble accessing the shared folder from my user account, but IIS is shut out. How does the file server even know the difference? I would assume that with Everyone given full control and password protected sharing turned off, it would not matter what the client user account is. In any case, how to solve? UPDATE: To clarify, I am not trying to serve up files on the share directly through IIS. Rather I am writing files to the share from my code (System.IO).

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• How to Install OS without DVD and USB boot

  - by Timothy James Reed

  I just purchased a used Dell F1D 1U rack mount server and would like to install Ubuntu or ESXi with Virtual Disks or anything for that matter. I'v read that Dell's have built in DRAC so you can access it remotely. There are 3 ethernet plugs in the back but I dont know which one to use. In the BIOS it says I can configure Remote access on [com1] or [com2] not sure if that is ethernet 1 & 2. I also set it up so to use a static IP adress. Thats as far as I have gone. Not sure what to do next. I'v Tried to do a PXE server with TFTP but get stuck at Error "cant locate file" or something like that. Not even sure I want to go that route anymore because of all the hassel of editing files. All my computers are OSX or Linux and the only Windows I have is via VMWare. What steps to i do now?

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• Java VM problem in OpenVZ

  - by Ginnun

  Hi, I bought a vps for hosting my java needs. But I can't run java on it. Everything about java is correctly installed but when I try to run java ("java -version" forexample) I get this error : Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. I don't think this is a java centered problem, Out of memory for sure. I contacted the vps admin, but he says everything is fine, you have 2gb ram, expandable to 4gb! I did a bit search on the subject, here is my BEANS file (numbers converted to humanredable form using a script). By the way do JVM heap memory allocs count on kmemsize or privvmpages ? How much ram does that configuration allows me to allocate with jvm for a single process? resource held maxheld barrier limit failcnt kmemsize 2.25 mb 2.35 mb 13.71 mb 14.10 mb 0 lockedpages 0 0 1024.00 kb 1024.00 kb 0 privvmpages 20.54 mb 21.33 mb 256.00 mb 272.00 mb 156 shmpages 5.00 mb 5.00 mb 84.00 mb 84.00 mb 0 numproc 13 14 240 240 0 physpages 9.36 mb 9.45 mb 0 MAX_ULONG 0 vmguarpages 0 0 132.00 mb MAX_ULONG 0 oomguarpages 9.36 mb 9.45 mb MAX_ULONG MAX_ULONG 0 numtcpsock 3 3 360 360 0 numflock 3 3 188 206 0 numpty 2 2 16 16 0 numsiginfo 0 1 256 256 0 tcpsndbuf 69.17 kb 69.17 kb 1.64 mb 2.58 mb 0 tcprcvbuf 48.00 kb 48.00 kb 1.64 mb 2.58 mb 0 othersockbuf 6.80 kb 6.80 kb 1.07 mb 2.00 mb 0 dgramrcvbuf 0.00 kb 0.00 kb 256.00 kb 256.00 kb 0 numothersock 9 10 360 360 0 dcachesize 0.00 kb 0.00 kb 3.25 mb 3.46 mb 0 numfile 704 746 9312 9312 0 numiptent 10 10 128 128 0 Thanks in advance!

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• Ubuntu Wubi "drive" failure; mount drive in XP?

  - by 618034

  Hi there, I installed the Wubi distribution of Ubuntu on a separate partition (which is silly, since why do I care if Windows can still manage the partition?) a few months back; it was pretty awesome, until Linux hosed. At this point, I can get Ubuntu to boot if I try really hard through grub, but once it does start, the screen is hosed, so no dice. At this point, I'd like to wipe it all and start over, but I need to get some stuff off the "disk". The Wubi install makes this difficult, since the "disk" is a flat file on an NTFS partition. I've done just about everything I can think of — I renamed the virtual disk .iso, mounted it with VirtualCloneDrive, then used whatever magic EXT3 (EXT4?) readers I could dig up on the Internet to parse the mount — but nothing's working. Can you offer any suggestions? The "disk" is currently in D:\ubuntu\disks\root.iso. Many thanks! (I may be high-latency at the moment, apologies if I don't address follow-ups quickly)

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• Understanding RedHats recommended tuned profiles

  - by espenfjo

  We are going to roll out tuned (and numad) on ~1000 servers, the majority of them being VMware servers either on NetApp or 3Par storage. According to RedHats documentation we should choose the virtual-guestprofile. What it is doing can be seen here: tuned.conf We are changing the IO scheduler to NOOP as both VMware and the NetApp/3Par should do sufficient scheduling for us. However, after investigating a bit I am not sure why they are increasing vm.dirty_ratio and kernel.sched_min_granularity_ns. As far as I have understood increasing increasing vm.dirty_ratio to 40% will mean that for a server with 20GB ram, 8GB can be dirty at any given time unless vm.dirty_writeback_centisecsis hit first. And while flushing these 8GB all IO for the application will be blocked until the dirty pages are freed. Increasing the dirty_ratio would probably mean higher write performance at peaks as we now have a larger cache, but then again when the cache fills IO will be blocked for a considerably longer time (Several seconds). The other is why they are increasing the sched_min_granularity_ns. If I understand it correctly increasing this value will decrease the number of time slices per epoch(sched_latency_ns) meaning that running tasks will get more time to finish their work. I can understand this being a very good thing for applications with very few threads, but for eg. apache or other processes with a lot of threads would this not be counter-productive?

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• Hyper-V VM Lab + RRAS + RDP

  - by Dennis Evans

  My background is primarily .NET Development with some System Administration skills. I'm trying to set up a VM Lab for me to test System Applications I'm developing but I've only ever done System Administration in already set up environments; I've never set up my own. My current setup: Server 2008 R2 Hyper-V Host on physical machine (only role enabled) with two NICs. First NIC dedicated for Management w/ DHCP address from company's network. Second NIC dedicated to RRAS VM w/ DHCP address from company's network. RRAS VM has two NICS, one is virtual private internal only NIC w/ static entry. The other is the physical NIC mentioned above. I've joined it to my VMLab.net internal domain. My Active Directory Domain Controller server (ADCT) also runs DNS, DHCP, and Certificate Services which I'm familiar with but don't understand completely. RRAS is already set up with NAT to provide the private internal network with Internet access. What I would like to do is be able to RDP into the servers/computers on the VMLab.net domain from my computer. Do I need to add the Remote Desktop Services role and enable the Remote Desktop Gateway service on RRAS in order to do this or is there a way to set up port forwarding on RRAS to just allow a direct connection to the internal servers...or both? What would the best practices be here? Network Diagram http://i.stack.imgur.com/4qfnk.png

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• keepalived issues on xen domU

  - by David Cournapeau

  Hi, I cannot manage to run keepalived correctly on xen domU. I am following this link for configuration, and it works great on some local VM (running with KVM). If I set up the exact same configuration, but on xen domU, it does not work: both servers do not see each other and decide to be master (10.120.100.99 being the virtual IP) $ sudo ip addr sh eth0 # host1 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:16:3e:78:f5:31 brd ff:ff:ff:ff:ff:ff inet 10.120.100.104/24 brd 10.120.100.255 scope global eth0 inet 10.120.100.99/32 scope global eth0 inet6 fe80::216:3eff:fe78:f531/64 scope link valid_lft forever preferred_lft forever $ sudo ip addr sh eth0 # host2 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:16:3e:51:36:20 brd ff:ff:ff:ff:ff:ff inet 10.120.100.105/24 brd 10.120.100.255 scope global eth0 inet 10.120.100.99/32 scope global eth0 inet6 fe80::216:3eff:fe51:3620/64 scope link valid_lft forever preferred_lft forever Is there a way I could debug this - it seems some people are able to use keepalived on xen following some mailing list, but without much info on their config.

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• How to avoid ugly dithering when running KDE over VNC?

  - by Chris Jester-Young

  I'm currently setting up a new Xen paravirt domain running KDE (4.2.2, from Kubuntu 9.04). As I have been unable to get the virtual framebuffer working in it, I've decided to set up VNC (from the vnc4server package), and run KDE over Xvnc. This is all fine and good, and KDE starts up okay. However, all the colours look dithered, especially on the task bar and title bar, making them impossible to see. From my web searches, it appears to be because these items are drawn using Porter-Duff. This is especially the case when using the Oxygen style, and Oxygen and Ozone window titlebars (selecting these styles generates messages about Porter-Duff being unavailable); not using those styles at least makes most of the UI widgets and window titles usable again. But this doesn't solve the problem for the task bar, nor for the desktop, where the only theme available to me is Oxygen (this is under the "Desktop Settings - Plasma Workspace" window, just for reference). So, unless I have a way to use a non-Porter-Duff theme for those, it seems that KDE would still be unusable under VNC. So if someone experienced with KDE can advise on how to work around, or even fix, these issues, I'd appreciate it very much. :-)

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• Create a partition table on a hardware RAID1 drive with [c]fdisk

  - by Lev Levitsky

  My question is, is there a reason for this not to work? Details: I have two 500 Gb drives, and my motherboard RAID support, so I created a RAID1 array and booted from a Linux live medium. I then listed the disks and, apart from the obvious /dev/sda, /dev/sdb, etc. there was /dev/md126 which, I figured, was the mirrored "virtual" drive. Its size was 475 Gb; I had seen that the size of the array would be smaller than 500 Gb when I was creating it, so no surprise there. I did cfdisk /dev/md126, created the necessary partitions and chose write. It's been about half an hour now, I think. It doesn't seem like it's ever going to finish. The only thing about cfdisk in dmesg is that it's "blocked for more than 120 seconds". Doing fdisk -l /dev/md126 in another terminal I see all three partitions I created and a note that "Partition 1 does not start on a physical sector boundary". The table is lost after reboot, though. I tried to partition /dev/sda individually, and it worked, the table was written in about a second. The "not on a physical sector boundary" message is there, too. EDIT: I tried fdisk on /dev/sda, then there were no messages about sector boundaries. After a reboot, I am able to use mkfs on /dev/dm126p1, etc. fdisk shows that /dev/md126 has the same partitions as /dev/sda (but /dev/sdb doesn't have any). But at some point ("writing superblock and filesystem accounting information") mkfs is also blocked. Using it on sda1 results in a "partition is used by the system" error. What can be the problem? EDIT 2: I booted a freshly updated system from a pendrive and was able to create partition table and filesystems on /dev/md126 without any apparent problems. Was it an issue with the support of the hardware? My MB is Asus P9X79.

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• How to connect a USB GDI printer to Linux over a D-Link print server?

  - by jpe

  The setup is the following: +------------+ +-----------------+ +---------+ | HP LJ P1005|--USB--| D-Link DPR-1020 |---LAN---| PC Linux| +------------+ +-----------------+ + +---------+ | +------------+ +--| PC Windows | +------------+ HP LJ P1005 is one of those GDI printers that requires the printer driver to do most of the work for it and therefore is a bit "special". D-Link DPR-1020 is a print server with an Ethernet and an USB port that actually supports printing to challenged (read GDI) printers using a utility called PS-Link. What the utility does is basically mirror a USB port over the network to the print server so that the printer driver and the printer both are happy to talk to each other. The PC-s are notebooks that come and go, i.e. are not there all the time. Is there an equivalent of the D-Link PS-Link utility for Linux that could mirror a USB port over the network for a Linux host? And can the solution be used with D-Link DPR-1020? If not then I basically wasted the money buying the print server because the goal was to share a small printer among a couple of users with diverse operating systems in an office. The print server specs say that it supports Linux and LJ P1005, but the Catch 22 appears to be the solution used for GDI printers... It should be noted that it is possible to print from Linux to LJ P1005 directly over USB. This far sharing involved reconnecting the USB cable to appropriate computer to print. Now one of the desks is separated, so the cable does not work. Searching the net did not yield anything useful. Please do not suggest solutions involving a Windows machine (either virtual or not), my question is whether a solution only involving a Linux machine exists.

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• VirtualBox VM running web server not accessible via external IP

  - by mwigdahl

  I have a Windows 7 machine running VirtualBox with an Ubuntu guest. The guest has a Bitnami LAMP stack installed. I have the guest configured for Bridged networking, and I can access the guest web server just fine from other machines on my LAN using the guest's IP. I'm trying to configure port forwarding so that I can access the web server from outside my LAN. (The router is a 2WIRE model as I'm on ATT's UVerse). I've set up port forwarding for ports 80 and 443 to the guest's IP in a similar manner to how I had them set up for my previous, physical web server, which worked just fine. However, I cannot seem to access the new, virtual web server using my external IP on the forwarded port. I suspected Windows Firewall issues on the host, but disabling it didn't solve the issue. Anyone have advice on what I should try next? EDIT: I've now attempted disabling the firewall on the guest with sudo ufw disable -- that doesn't seem to help either. However, after checking the router's port forwarding in more detail I may see the problem. My VM is named "linux" and in the router's configuration pages it shows up inconsistently. Sometimes it reports with a valid LAN IP and other times it doesn't show up with any IP. Even when it shows the correct IP the router indicates that it is disconnected. Could this be an indication that the 2WIRE router doesn't play well with VirtualBox's bridged networking mode?

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• No clue for high load average on top

  - by Oz.

  We have several machines on Amazon (ec2) of the type c1.xlarge with 16 cpus, running the Amazon AMI. Details on the machine: 7 GB of memory 20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each) 1690 GB of instance storage 64-bit platform I/O Performance: High API name: c1.xlarge One out of the several machines is showing a high load average, since we have run the last yum upgrade a couple of weeks a go. We did not yet update the other machines, and everything looks normal on them. The strange thing is that the top command not showing any hint for the cause of the load. CPUs are 4.8%us, 1.1%sy, 0.0%ni, 94.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st(see below). Mem is about 1.5GB free. Any idea what could it be, or where else can we check? Many thanks for the help. # # top # top - 07:57:42 up 4:18, 1 user, load average: 1.36, 1.45, 1.47 Tasks: 131 total, 1 running, 130 sleeping, 0 stopped, 0 zombie Cpu(s): 4.8%us, 1.1%sy, 0.0%ni, 94.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 7120092k total, 5644920k used, 1475172k free, 532888k buffers Swap: 0k total, 0k used, 0k free, 3463936k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1557 mysql 20 0 1829m 374m 6448 S 14.3 5.4 11:15.09 mysqld 6655 apache 20 0 416m 49m 3744 S 9.3 0.7 0:04.85 httpd 27683 apache 20 0 421m 54m 3708 S 9.0 0.8 0:00.99 httpd 6682 apache 20 0 424m 57m 3788 S 8.3 0.8 0:03.81 httpd 16816 apache 20 0 419m 51m 3760 S 4.3 0.7 0:04.09 httpd 22182 apache 20 0 417m 50m 3756 S 1.7 0.7 0:06.34 httpd 219 root 20 0 0 0 0 S 0.3 0.0 0:00.34 kworker/7:1 699 root 20 0 0 0 0 S 0.3 0.0 0:00.40 kworker/3:1 1 root 20 0 19376 1508 1212 S 0.0 0.0 0:00.29 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:00.71 ksoftirqd/0

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• Apache crashes a few seconds after the start.

  - by Nacho

  Hi, i've got a problem with apache. When i try to start it (/etc/init.d/apache2 start) it dies after a few seconds. It shows up on "ps aux" consuming a lot of memory and then dies. I don't know what could be causing apache to consume this amount of memory: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 13379 1.0 0.3 14376 3908 ? Ss 22:31 0:00 /usr/sbin/apache2 -k start www-data 13383 0.0 0.4 197316 4196 ? Sl 22:31 0:00 /usr/sbin/apache2 -k start www-data 13390 0.0 0.3 172728 4172 ? Sl 22:31 0:00 /usr/sbin/apache2 -k start www-data 13396 0.0 0.3 156336 4160 ? Sl 22:31 0:00 /usr/sbin/apache2 -k start www-data 13400 0.0 0.3 148140 4156 ? Sl 22:31 0:00 /usr/sbin/apache2 -k start www-data 13403 0.0 0.3 131748 4148 ? Sl 22:31 0:00 /usr/sbin/apache2 -k start Here is a htop screenshot: http://i.imgur.com/N4Chh.png It happened suddenly, no change had been made to server config, so i don't know whats causing it. The error log of my virtual servers shows this: [Sun Jan 30 22:19:50 2011] [alert] (11)Resource temporarily unavailable: mod_wsgi (pid=9685): Couldn't create worker thread 11 in daemon process 'fb.ebookmetafinder.com'. [Sun Jan 30 22:19:55 2011] [alert] (11)Resource temporarily unavailable: mod_wsgi (pid=9685): Couldn't create worker thread 19 in daemon process 'fb.ebookmetafinder.com'. [Sun Jan 30 22:29:40 2011] [alert] (11)Resource temporarily unavailable: mod_wsgi (pid=12009): Couldn't create worker thread 18 in daemon process 'fb.ebookmetafinder.com'. [Sun Jan 30 22:31:06 2011] [alert] (11)Resource temporarily unavailable: mod_wsgi (pid=13396): Couldn't create worker thread 15 in daemon process 'fb.ebookmetafinder.com'. [Sun Jan 30 22:35:02 2011] [alert] (11)Resource temporarily unavailable: mod_wsgi (pid=14009): Couldn't create worker thread 16 in daemon process 'fb.ebookmetafinder.com'. [Sun Jan 30 22:35:07 2011] [alert] (11)Resource temporarily unavailable: mod_wsgi (pid=14009): Couldn't create worker thread 17 in daemon process 'fb.ebookmetafinder.com'. I'm on a ubuntu server vps and i use mod_wsgi with django. Thanks.

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• Compiling linux kernel, how much size is needed?

  - by ant2009

  Hello, I am have downloaded the newest most stable linux kernel 2.6.33.2 I thought I would test this using virtualbox. So I create a dynamically sized harddisk of 4gb. And installed CentOS 5.3 with just the minimum packages. I setup the make menuconfig with just the default settings. After that I ran make and got the following error: net/bluetooth/hci_sysfs.o: final close failed: No space left on device make[2]: *** [net/bluetooth/hci_sysfs.o] Error 1 make[1]: *** [net/bluetooth] Error 2 make: *** [net] Error 2 The amount of space I have left is: # df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 3.3G 3.3G 0 100% / /dev/hda1 99M 12M 82M 13% /boot tmpfs 125M 0 125M 0% /dev/shm My virtual size is 4gb, but the actual size is 3.5gb $ ls -hl total 7.5G -rw-------. 1 root root 3.5G 2010-04-13 14:08 LFS.vdi How much size should I give when compiling and installing a linux kernel? Is there any guidelines to follow when doing this? This is my first time, so just experimenting with this. Many thanks,

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• Can't seem to stop Postfix backscatter

  - by Ian

  I've just migrated to a Postfix system and can't seem to stop the backscatter messages to unknown addresses on the site. I have a file, validrcpt, that lists all the valid emails on the site - about eight of them. Yet when a message is sent to a non-existent address, instead of just dropping it, postfix is replying with a "Recipient address rejected: User unknown in virtual mailbox table" email. Do I have something set wrong? I've read http://www.postfix.org/BACKSCATTER_README.html but unless I'm caffeine deficient, I don't see what's happening and perhaps I'm just to used to my old qmail setup. Here's postconf -n: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix content_filter = smtp-amavis:[127.0.0.1]:10024 home_mailbox = Maildir/ inet_interfaces = all inet_protocols = ipv4 local_recipient_maps = hash:/etc/postfix/validrcpt mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/dovecot.conf -m "${EXTENSION}" mailbox_size_limit = 0 mydestination = localhost myhostname = localhost mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname policy-spf_time_limit = 3600s readme_directory = no recipient_bcc_maps = hash:/etc/postfix/recipient_bcc recipient_delimiter = + relay_recipient_maps = hash:/etc/postfix/relay_recipients relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = permit_mynetworks,permit_sasl_authenticated,reject_unauth_destination,check_policy_service unix:private/policy-spf,reject_rbl_client zen.spamhaus.org,reject_rbl_client bl.spamcop.net,reject_rbl_client cbl.abuseat.org,check_policy_service inet:127.0.0.1:10023 smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/dovecot-auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_sender_restrictions = reject_unknown_sender_domain smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/dovecot/dovecot.pem smtpd_tls_key_file = /etc/dovecot/private/dovecot.pem smtpd_tls_mandatory_ciphers = medium smtpd_tls_mandatory_protocols = SSLv3, TLSv1 smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes tls_random_source = dev:/dev/urandom virtual_gid_maps = static:5000 virtual_mailbox_base = /home/vmail virtual_mailbox_domains = digitalhit.com virtual_mailbox_maps = hash:/etc/postfix/vmaps virtual_minimum_uid = 1000 virtual_uid_maps = static:5000

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• How do I secure Sql Server 2008 R2

  - by Mark Tait

  I have both a dedicated and a VPS (from Fasthosts) virtual server - the web sites/applications I run on these, access Sql Server stored on the same web server. Until now, I have logged onto Sql Server on both the deidicated and VPS server, from Sql Server Management Studio - until I noticed in my server application logs, multiple attempts to logon to Sql Server using the 'sa' username, but failed password. So someone/bot is trying hard (repeatedly every couple of hours, for approx 20 attempts during each instance) to log on... so obviously I have to lock down access to Sql Sever remotely. What I have done is gone into Configuration Manager, and in Sql Server Network Configuration - Protocols for Sql2008 and also in Sql Native Client 10.0 Configuration - Client Protocols - I have diabled Named Pipes, TCP/IP (and VIA by default). I have left Shared Memory enabled. I also disabled in Sql Server Services, the Sql Server Browser. Now the only way I can manage the databases on these servers, is by logging on to them via Remote Desktop. Can anyone confirm if this is the correct way of stopping anyone maliciously logging on to Sql Server? (I'm not a DBA or security expert - and there are hundreds of articles advising all different ways - but I was hoping for the experts here to confirm, or otherwise, if what I've done is correct) Thank you, Mark

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• Checking partition alignment with PowerCLI

  - by Julian

  I'm trying to verify that the file system partitions within each of the servers I'm working on are aligned correctly. I've got the following script that when I've tried running will either claim that all virtual servers are aligned or not aligned based on which if statement I use (one is commented out): $myArr = @() $vms = get-vm | where {$_.PowerState -eq "PoweredOn" -and $_.Guest.OSFullName -match "Microsoft Windows*" } | sort name foreach($vm in $vms){ $wmi = get-wmiobject -class "win32_DiskPartition" -namespace "root\CIMV2" -ComputerName $vm foreach ($partition in $wmi){ $Details = "" | Select-Object VMName, Partition, Status #if (($partition.startingoffset % 65536) -isnot [decimal]){ if ($partition.startingoffSet -eq "65536"){ $Details.VMName = $partition.SystemName $Details.Partition = $partition.Name $Details.Status = "Partition aligned" } else{ $Details.VMName = $partition.SystemName $Details.Partition = $partition.Name $Details.Status = "Partition not aligned" } $myArr += $Details } } $myArr | Export-CSV -NoTypeInformation "C:\users\myself\Documents\Scripts\PartitionAlignment.csv" Would anyone know what is wrong with my code? I'm still learning about partitions so I'm not sure how I need to check the starting off-set number to verify alignment. EDIT: $myArr = @() $vms = get-vm | where {$_.PowerState -eq "PoweredOn" -and $_.Guest.OSFullName -match "Microsoft Windows*" } | sort name $wmi = get-wmiobject -class "win32_DiskPartition" -namespace "root\CIMV2" -ComputerName $vm #foreach ($_ In Get-WMIObject Win32_DiskPartition | Select Name, BlockSize, NumberOfBlocks, StartingOffSet, @{n='Alignment'; e={$_.StartingOffSet/$_.BlockSize}}) {$_} foreach ($wmi| Select Name, BlockSize, NumberOfBlocks, StartingOffSet, @{n='Alignment'; e={$_.StartingOffSet/$_.BlockSize}}) {$_}

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