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iSCSI, failover and XenServer

- by jemmille

I have an iSCSI fail over implementation setup so if one of my storage units fails the other takes over immediately (it also runs the NFS shares). When fail over occurs, volumes are exported, the IP is switched to the other machine and the targets are reconfigured. The fail over of the storage system itself works just fine. I use NexentaStor for my filer. When I do a test (manual) fail over of my storage the following occurs: Note: I run the admin VM's on NFS and customer based VM's on iSCSI All NFS based VM's remain up and working perfectly through the failover and after All VM 's running on iSCSI eventually report the following: An error about not being able to write to a particular block An error about journaling not working Then the file system goes RO To get the VM's working again I have to do the following: Force shutdown of the "broken" VM's. Detach the iSCSI SR Re-attach the iSCSI SR Boot the VM on a different server (5 in my pool) If I don't boot on a different server I get this error "Internal error: Failure("The VDI <uuid> is already attached in RW mode; it can't be attached in RO mode!")" The only way I have found to fix that error is to reboot the entire server it was running on previously which is obviously a huge pain. Currently multipathing is NOT enabled (but can be and the same thing still occurs). I have edited much of the /etc/iscsid.conf file to work with the timeout settings but to no avail. In short, my storage fails over properly but XenServer does not keep the connection alive. As a thought, the error that shows up in #4 above might be the ultimate cause and fixing that would fix everything? Any help would be appreciated more than you know.

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Disable raid member check upon mount to mount damaged nvidia raid1 member

- by Halfgaar

Hi, A friend of mine destroyed his Nvidia RAID1 array somehow and in trying to fix it, he ended up with a non-working array. Because of the RAID metadata, the actual disk data was stored at an offset from the beginning. I was able to identify this offset with dd and a hexeditor and then I used losetup to create a loop device with the proper offset, so that I could mount the partition. It was then that I ran into problems, namely that mount says: "mount: unknown filesystem type 'nvidia_raid_member'". I also had this when trying to mount a Linux MD component the other day, and because I can remember that doing that in the past worked, I surmised that it may be some kind of protection. I therefore booted an old Sysrescue CD and tried it there, which worked (because of the older version of mount/libc/kernel/whatever). I still need to try to get more data, and because I don't want to keep using that SysrecueCD, I'd like to be able to mount the disk on my normal system. So, my question is: can the check for a disk being a raid member be disabled? I guess I could also zero out blocks that look like the raid block, but I'd rather not... I made an image of the disk with par2 data, so it's revertable, but still...

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Nginx dynamic upstream configuration / routing

- by Dan Sosedoff

I was experimenting with dynamic upstream configuration for nginx and cant find any good solution to implement upstream configuration from third-party source like redis or mysql. The idea behind it is to have a single file configuration in primary server and proxy requests to various app servers based on environment conditions. Think of dynamic deployments where you have X servers that are running Y workers on different ports. For instance, i create a new app and deploy. App manager selects a server and then rolls out a worker (Ruby/PHP/Python) and then reports the ip:port to the central database with status "up". At this time when i go to the given url nginx should proxy all requests to the specified ip:port upstream. The whole thing is pretty similar to what heroku does, except this proof-of-concept is not supposed to be production ready, mostly for internal needs. The easiest solution i found was using resolver with ruby-based DNS server. It works, nginx gets the IP address correctly, but the only problem is that you cant define port number for that IP. Second solution (which i havent tried yet) is to roll something else as a proxy server, maybe written in Erlang. In this case we need to use something to serve static content. Any ideas how to implement this in more flexible and stable way? P.S. Some research options: http://openresty.org/#DynamicRoutingBasedOnRedis https://github.com/nodejitsu/node-http-proxy

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Apache error: could not make child process 25105 exit, attempting to continue anyway

- by Temnovit

Hello! I have a web server based on Ubuntu Server 9.10 with this software: apache 2 PHP 5.3 MySQL 5 Python 2.5 Few of my websites are PHP based, few use python/django through mod_wsgi. For month or so, every day my apache server stops responding until I manually restart it. Error logs show: [Fri Mar 05 17:06:47 2010] [error] could not make child process 25059 exit, attempting to continue anyway [Fri Mar 05 17:06:47 2010] [error] could not make child process 25061 exit, attempting to continue anyway [Fri Mar 05 17:06:47 2010] [error] could not make child process 24930 exit, attempting to continue anyway [Fri Mar 05 17:06:47 2010] [error] could not make child process 25084 exit, attempting to continue anyway [Fri Mar 05 17:06:47 2010] [error] could not make child process 25105 exit, attempting to continue anyway and so on. I tried to google this problem but it seems, that I can't find a solution there. How can I determine the cause of this error and how do I fix it? Thank you for your help. UPDATE Updating mod-wsgi to version 3.1 didn't solve the problem Updating PHP to 5.3 also didn't solve it Here is a list of all installed modules: core mod_log_config mod_logio prefork http_core mod_so mod_alias mod_auth_basic mod_authn_file mod_authz_default mod_authz_groupfile mod_authz_host mod_authz_user mod_autoindex mod_cgi mod_deflate mod_dir mod_env mod_mime mod_negotiation mod_php5 mod_rewrite mod_setenvif mod_status mod_wsgi Here's how my virtual host with wsgi looks: <VirtualHost *:80> ServerName example.net DocumentRoot /var/www/example.net #wcgi script that serves all the thing WSGIScriptAlias / /var/www/example.net/index.wsgi WSGIDaemonProcess example user=wsgideamonuser group=root processes=1 threads=10 WSGIProcessGroup example Alias /static /var/www/example.net/static #serving admin files Alias /media/ /usr/local/lib/python2.6/dist-packages/django/contrib/admin/media/ <Location "/static"> SetHandler None </Location> <Location "/media"> SetHandler None </Location> ErrorLog /var/www/example.net/error.log </VirtualHost> Error log now contains two types of errors fallowed one by another: [error] child process 9486 still did not exit, sending a SIGKILL [error] could not make child process 9106 exit, attempting to continue anyway

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zfs setup question

- by Staale

Currently I have a linux storage box and server with 4x750gb harddrives in raid-5 with ext3. I have ordered 3x1.5tb disks to upgrade this. Here is my planned upgrade: Backup: Format the 1.5 tb disks Copy all data from the raid-5 disks to the 1.5tb disks Destroy the raid-5 array. New setup: Create a VirtualBox system and install Nexenta (OpenSolaris + ubuntu) on it. Create a zfs pool with zraid1 with the 4 750gb disks. Copy from 1.5tb disks to the virtualbox zfs pool Format the 1.5tb disks. Replace 3 off the 750gb disks with 1.5tb disks. Reuse the 750gb disks elsewhere. The reason I wish to use one 750gb disk is since I can't grow the disk count in a raidz array, and this gives me the option off replacing that disk later for an extra 750gb storage. Would the ZFS performance be good running through virtualbox? Or will the performance overhead be too large? Will I get 1.5tb+1.5tb+750gb storage on the zraid? Or just 750gbx3 until all disks are 1.5tb?

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mdadm cron job sends email that cron has run

- by Andrew

I've got an Ubuntu 8.04 server using mdadm to create several RAID1 arrays. I created /etc/cron.hourly/mdadm as follows: #! /bin/sh set -e mdadm --monitor /dev/md0 /dev/md3 /dev/md4 --oneshot (Yes, the array numbers are not sequential, and I'm not using --scan beacuse I have a degraded array that may or may not have been used as swap and I can't delete, but I think that's a separate issue. If it's the underlying cause of this, I need to fix it.) mdadm sends me email (configured in the /etc/mdadm/mdadm.conf) on DegradedArray etc. events. This is the desired behaviour. What is not desired, and I can't work out, is why cron is sending me (relatively pointless) emails, via an alias in /etc/aliases: From: root@<hostname> (Cron Daemon) To: root@<hostname> Subject: Cron <root@<hostname>> cd / && run-parts --report /etc/cron.hourly Content-Type: text/plain; charset=ANSI_X3.4-1968 X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin> X-Cron-Env: <HOME=/root> X-Cron-Env: <LOGNAME=root> Message-Id: <id@hostname> Date: Fri, 7 May 2010 13:17:01 +0930 (CST) /etc/cron.hourly/mdadm: mdadm: Monitor using email address "<root_alias@domain>" from config file I've got a dozen other servers behaving correctly (mdadm sends email, cron doesnt') with identical /etc/crontab files: # /etc/crontab: system-wide crontab # <snip comments> SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly <snip anacron jobs> Should I simply remove the --report, or is there something else in my cron config somewhere causing this?

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How can I fix my corrupted RAID1 ext4 partition on a Synology DS212 NAS?

- by Neil

I have two identical 3 TB disks that were in a RAID1 array, where one disk crashed. I replaced the failed disk, but not after the RAID partitions got messed up. I need to figure out how to restore the RAID array and get at my ext4 partition. Here are the properties of the surviving disk: # fdisk -l /dev/sda fdisk: device has more than 2^32 sectors, can't use all of them Disk /dev/sda: 2199.0 GB, 2199023255040 bytes 255 heads, 63 sectors/track, 267349 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 1 267350 2147483647+ ee EFI GPT # parted /dev/sda print Model: ATA ST3000DM001-9YN1 (scsi) Disk /dev/sda: 3001GB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags 1 131kB 2550MB 2550MB ext4 raid 2 2550MB 4698MB 2147MB linux-swap(v1) raid 5 4840MB 3001GB 2996GB raid I replaced the failed drive, and cloned the surviving drive to it so I have something to work with. I cloned the drives with dd if=/dev/sdb of=/dev/sda conv=noerror bs=64M, and now /dev/sda and /dev/sdb are identical. Here is the RAID information: # cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] md1 : active raid1 sdb2[1] 2097088 blocks [2/1] [_U] md0 : active raid1 sdb1[1] 2490176 blocks [2/1] [_U] unused devices: <none> It seems that md2 is missing. Here is what testdisk 6.14-WIP finds: Disk /dev/sda - 3000 GB / 2794 GiB - CHS 364801 255 63 Current partition structure: Partition Start End Size in sectors 1 P Linux Raid 256 4980735 4980480 [md0] 2 P Linux Raid 4980736 9175039 4194304 [md1] Invalid RAID superblock 5 P Linux Raid 9453280 5860519007 5851065728 5 P Linux Raid 9453280 5860519007 5851065728 # After a quick search Disk /dev/sda - 3000 GB / 2794 GiB - CHS 364801 255 63 Partition Start End Size in sectors D MS Data 256 4980607 4980352 [1.41.12-2197] D Linux Raid 256 4980735 4980480 [md0] D Linux Swap 4980736 9174895 4194160 D Linux Raid 4980736 9175039 4194304 [md1] >P MS Data 9481056 5858437983 5848956928 [1.41.12-2228] And listing the files on the last partition in the list shows all of my files intact. What should I do?

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Auto load balancing two node Cluster Hyper-v 2008 R2 enterprise?

- by Kristofer O

My setup is a 2 node cluster with 72GB ram each and a ~10TB MD3000i Iscsi SAN. I have about 30VMs running I keep about 15 on either server. I do a live migration to the other server if I need to run updates or whatever... Either one of the servers is able of running all VM if needed, but the cpu is pretty high. Here's my issues. I know Hyper-v has a limit of a single Live-migration at a time. But Why doesn't it queue them up to move one at a time? If I multi select I don't get the option to live migrate a one at a time. OR if I'm in the process of Migrating one it will give me an error that it's currently migrating a VM... Is there a button I missed that will tell a Node that it needs to migrate all the VMs elsewhere? Another question, does anyone know whats the best way to load balance VMs based on CPU and/or network utilzation. I have some VMs that don't do much. and some that trash the CPU or network. I'd like to balance it out on both servers if at all possible. and Is there any way to automate it? last question... If I overcommit my Cluster is there a way to tell the cluster that I want certian VMs the be running and to savestate other VMs based on availible system resources? Say when my one node blue screens and the other node begins starting the VMs up. I want the unimportant ones to shutdown or savestate so the important ones can stay running or come back online. Thanks just for reading all that. Any help would be great.

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Why are my Windows 7 updates continuously failing?

- by Chris C.

I'm an advanced level user here with an odd issue. I have two Windows Updates that are failing to install, every single time. I'm getting a mysterious "Code 1" error on both updates, an error for which I'm having difficulty finding a solution. The updates in question are: Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2011] Because these updates are failing, the Shut Down button in my start menu always has the shield icon next to it, indicating that "new" updates will be installed on shut down. But, of course, they'll fail and when the PC is restarted, the shield icon is still there. When checking the update history and viewing the details of the failed updates, I get the following: Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) Installation date: ?6/?29/?2011 3:00 AM Installation status: Failed Error details: Code 1 Update type: Important A security issue has been identified leading to MFC application vulnerability in DLL planting due to MFC not specifying the full path to system/localization DLLs. You can protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer. More information: http://go.microsoft.com/fwlink/?LinkId=216803 System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2011] Installation date: ?6/?28/?2011 3:00 AM Installation status: Failed Error details: Code 1 Update type: Important This tool is being offered because an inconsistency was found in the Windows servicing store which may prevent the successful installation of future updates, service packs, and software. This tool checks your computer for such inconsistencies and tries to resolve issues if found. More information: http://support.microsoft.com/kb/947821 About My System I'm running Windows 7 Home Premium x64 Edition. This is a custom PC build and the OS was installed fresh, not an upgrade from a previous version. I've been running this system for about 4 months. Windows Updates aside, the system is usually quite stable. Thanks in advance for your help!

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How to register an agent with launchd

- by Konrad Rudolph

I’m unable to schedule a periodic launch with launchctl/launchd on OS X (Leopard). Basically, I’m unable to find a step-by-step list of instructions on the web and the intuitive approach doesn’t work. The sync.plist file: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>net.madrat.utils.sync</string> <key>Program</key> <string>rsync</string> <key>ProgramArguments</key> <array> <string>-ar</string> <string>/path/to/folder/</string> <string>/path/to/backup/</string> </array> <key>StartInterval</key> <integer>7200</integer> </dict> </plist> I’ve put this script inside the path ~/Library/LaunchAgents. Next, I’ve registered the script using launchctl load ~/Library/LaunchAgents/sync.plist Finally, to test that it works, I started the job: launchctl start net.madrat.utils.sync – Nothing happened. Manually executing the rsync command in the terminal yields the expected result. I’m fairly sure that the job was registered correctly because if I try to start a non-existing job, I get an error message (which I didn’t get in the above command). What did I do wrong?

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Strange performance issue with Dell R7610 and LSI 2208 RAID controller

- by GregC

Connecting controller to any of the three PCIe x16 slots yield choppy read performance around 750 MB/sec Lowly PCIe x4 slot yields steady 1.2 GB/sec read Given same files, same Windows Server 2008 R2 OS, same RAID6 24-disk Seagate ES.2 3TB array on LSI 9286-8e, same Dell R7610 Precision Workstation with A03 BIOS, same W5000 graphics card (no other cards), same settings etc. I see super-low CPU utilization in both cases. SiSoft Sandra reports x8 at 5GT/sec in x16 slot, and x4 at 5GT/sec in x4 slot, as expected. I'd like to be able to rely on the sheer speed of x16 slots. What gives? What can I try? Any ideas? Please assist Cross-posted from http://en.community.dell.com/support-forums/desktop/f/3514/t/19526990.aspx Follow-up information We did some more performance testing with reading from 8 SSDs, connected directly (without an expander chip). This means that both SAS cables were utilized. We saw nearly double performance, but it varied from run to run: {2.0, 1.8, 1.6, and 1.4 GB/sec were observed, then performance jumped back up to 2.0}. The SSD RAID0 tests were conducted in a x16 PCIe slot, all other variables kept the same. It seems to me that we were getting double the performance of HDD-based RAID6 array. Just for reference: maximum possible read burst speed over single channel of SAS 6Gb/sec is 570 MB/sec due to 8b/10b encoding and protocol limitations (SAS cable provides four such channels).

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How to stop SophosAV from scanning directories under source control

- by user26453

From googling it seems its well known that SophosAV as well as other AV programs have issues with how they interact and can inhibit source control utilities like TortoiseHG or TortoiseSVN. One solution is to exclude directories under source control from on-access scanning as detailed here on Sophos's support site. There is a corollary article that mentions some issues related to this, namely need to place multiple entries for exclusions based on the possibility of the location being accessed through the short vs. long name (e.g., Progra~1 vs. "Program Files"). One other twist is I am using a junction to relocate my user directory, C:\Users\Username, to a second hard drive, E:. Since I am not sure how this interacts I have included the source control directory as they are nested in both locations. As a result, I have included the two exclusions for the on-access scanning exclusions (and to be on the safe side on-demand exclusions as well, although this should only come into play when I select a parent directory of the exclusion to be scanned on-demand, but still). You'll notice I have no need to add extra exclusions for those locations based on short vs. long name distinctions. The two exclusion I have then, for both on-access and on-demand scanning exclusions are: C:\Users\Username\source-control-directory E:\source-control-directory However, this does not seem to work as TortoiseHG still lags terribly in response to any request as AV software starts scanning when the directory is accessed via TortoiseHG. I can verify without a doubt that Sophos is causing the problems: I can completely disable on-access scanning. Once this is done TortoiseHG responds very fast to all operations. I cannot leave this disabled obviously, but since the exclusion don't seem to be working, what next?

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mdadm+zfs vs mdadm+lvm

- by Alex

This may be a naive question since I'm new to this and I cannot find any results about mdadm+zfs, but after some testing it seems it might work: The use case is a server with RAID6 for some data that is backed-up somewhat infrequently. I think I'm well served by any of ZFS or RAID6. Platform is Linux. Performance is secondary. So the two setups I am considering are: A RAID6 array plus regular LVM and ext4 A RAID6 array plus ZFS (without redundancy). Is this second option that I don't see discussed at all. Why ZFS+RAID6? It's mainly because the inability of ZFS to grow a raidz2 with new disks. You can replace disks with larger ones, I know, but not add another disk. You can accomplish 2-disk redundancy and ZFS disk growth using mdadm as the redundancy layer. Besides that main point (otherwise I could go directly to raidz2 without RAID under it), these are the pros-cons that I see for each option: ZFS has snapshots without preallocated space. LVM requires preallocation (might be no longer true). ZFS has checksumming (very interested in this) and compression (nice bonus). LVM has online filesystem growth (ZFS can do it offline with export/mdadm --grow/import). LVM has encryption (ZFS-on-Linux has not). This is the only major con of this combo I see. I guess I could go RAID6+LVM+ZFS... seems too heavy, or not? So, to close with a proper question: 1) Is there anything that inherently discourages or precludes RAID6+ZFS? Anyone has experience with a setup like this? 2) Are there possibilities for checksumming and compression that would make ZFS unnecessary (maintaining the possibility of filesystem growth)? Because the RAID6+LVM combo seems the sanctioned, tested way.

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How to generate customized sudoers files in puppet depending on the environment they're deployed to?

- by gozu

the sysadmins are present in the sudoers files of all environments, but other sudoers are not. Different environments all have slightly different sudoers. Most of the time, 90% of users are the same, and 10% vary so we cannot have only one sudoers file for everything. Right now, we are using puppet with 10 different files with names like sudoers.production1, sudoers.production2, sudoers.production3, sudoers.testing1, sudoers.staging1 and so forth. Puppet then picks the file to deploy based on the server's $domain (ex: dbserver.staging1.acme.com) or $hardwaremodel. It works fine but it's a nightmare to maintain so many files. I'd like to autogenerate sudoers files based on the server's domain and have only one big file with all the sudoers permissions for all users and all environments. Something that looks like: User_Alias ADMINS = abe, bob, carol, dave case $domain { "staging1.acme.com" { #add dev1,dev2,tester1,tester2 to sudoers file } "testing2.acme.com" { #add tester1, tester3, tester4 to sudoers file } What's the best way to go about this? Suggestions for alternatives are welcome. I'd appreciate any tips. Update 1: For security reasons, we'd rather not concatenate a bunch of files from a folder located on a puppet client in case someone puts a file in there (maliciously or not) and either breaks the combined file or inserts something in it. Most importantly, for usability, we'd like to keep the number of sudoers related files (fragment or complete) on puppet server to either 3 (prod/stage/test) or preferably 1 file. this file would (somehow) generate sudoers files on the puppet server and send one customized file to each puppet client. The purpose of this would be only searching for a username in a single file and removing it quicker than doing it on 11 files. When adding a user to a bunch of environments, it won't be as quick, but only one file would need to be opened and looked at, greatly reducing the chances of an omission. our Sudo version is 1.6.9p8 so we can't use /sudoers.d folder, only a sudoers file.

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Experience with AMCC 3ware 9650se raid cards? Ours seems dead

- by antiduh

We have a 8-port 3ware 9650se raid card for our main disk array. We had to bring the server down for a pending power outage, and when we turned the machine back on, the raid card never started. This card has been in service for a couple years without problems, and was working up until the shutdown. Now, when we turn the machine on, the bios option rom that normally kicks in before the bootloader doesn't show up, none of the drives start, and when the OS tries to access the device, it just times out. The firmware on it has been upgraded in the past, so it's possible we've hit some sort of firmware bug. We're using it in a Silicon Mechanics R272 machine with gentoo for the OS. The OS eventually boots, but alas, without the card. We've ordered a new one, but I'm worried that if we replace the card it won't recognize the existing array. Has anybody performed a card swap before? Any help would be greatly appreciated. Edit: These are the kernel errors we see: 3ware 9000 Storage Controller device driver for Linux v2.26.02.012. 3w-9xxx 0000:09:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 3w-9xxx 0000:09:00.0: setting latency timer to 64 3w-9xxx: scsi0: ERROR: (0x06:0x000D): PCI Abort: clearing. 3w-9xxx: scsi0: ERROR: (0x06:0x001F): Microcontroller not ready during reset sequence. 3w-9xxx: scsi0: ERROR: (0x06:0x0036): Response queue (large) empty failed during reset sequence. 3w-9xxx 0000:09:00.0: PCI INT A disabled

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Microsoft Remote Desktop Services - Android

- by Matt Rogers

We have recently started testing Remote Desktop Services. We have deployed the environment using the latest server, Windows Server 2012 R2. We have deployed the Web Access Roles, RD Gateway, Connection Broker Virtualization Host and Session Host. We are running both, Virtual machine-based and Session-based deployments. All of these are working as expected internally and externally when using a Windows workstation as the RDS client, however, the Android client is unable to launch applications. Once you install the app from Google Play you are given a screen to add Remote Resources. After entering the appropriate URL, username and password we see the applications that have been published. Unfortunately, when we attempt to launch an app we get the following error: Connection Error Host not found. Please provide the fully-qualified name or the IP address of the host. We have already entered this information otherwise I don't believe we would be able to see the published applications. I think the error is related to the certificate and how it is being used to connect to the applications. Since this is in our lab environment we have not configured a valid external certificate on the servers and the trusted certificate that is installed on the android tablet points to our internal server / domain name. What I would like to know: Has anyone configured RDS Web Access on Server 2012 R2 and attempted to externally connect an Android or iOS device using the Microsoft supported Remote Desktop client. Are others experiencing the same problem we are? Were you able to resolve the issue? Was it related to the external cert / host name?

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Htpc aka "Media Center": cheap and *silent*?

- by Unknown

It may be me, or the place I live (Italy), but it seems pretty hard to get a build or a prebuilt nettop or a laptop that fits the need. I need something silent able to playback all h.264 fullhd content without stuttering, and well (and not loosing the hw acceleration because of softsubs...) silent not ugly silent and (possibly) cheap. I'm going the linux route, therefore i'm moving towards a cpu-based or nvida-integrated solution (i don't think ati hw accelerated playback - or the intel "hd" acceleration - is useable yet). Ion nettop; it's either the Acer Revo (but here it's incredibly pricey and it's hard to find the dualcore version) or the Asrock Ion 330, that in the current version is rated "silent" at 26Db. 26. Sounds pretty noisy to me!!! the previous version was even worse. was this product really aimed at htpc market?? the Dell Zino - i think it's ATI based unfortunately. Laptop: correct me if I'm wrong: sub 600€/$ units are quite loud under full load (because of the tiny fans). ULW laptops are indeed quite similar: tiniest fans = high pitched noise and the cpu still lacks power for non hd-accelerated video decoding Handmade build: little money can be saved with underpowered cpus, a low-midrange cpu would help in the case of non-hw-accelerated content the cases are quite pricey the PSU one has to get ranges between 100/150 €/$ minimum to keep the noise down a low-mid build, all included, sums up to over 650 €/$ for a still-looking-ugly-unit, without the blu-ray drive. Please help. What do you advise on this? ;) Am I ignoring laptops too much, maybe? Are low-priced Acers that noisy/high pitched under full load?

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Need a VM for running a PHP Sandbox

- by Phani

I am working on Web application honeypot. It collects PHP files it receives (as part of an RFI attack) and runs them in order to return the result back to the attacker. The aim is to coax the bad guy into going further into his attack. Based on the answers to my SO question, I am looking at using VMs for running the PHP Sandbox. The honeypot itself consists of Python code and will be running in a Linux environment (preferably Ubuntu-like). These are some of the requirements: The VM should be a light weight as possible. We are going to distribute the code around and many people are going to use the VM along with the Python based honeypot. So, the installation and configuration should not be too difficult. The guest system would also be Linux as we are going to distribute the VM image around. It should be possible for the Python code outside to talk to the guest system. It would be passing on the PHP file to the guest system and will get the output result from it. It should be possible to automate the initial configuration of the VM (such as allocation of RAM etc.) I would like to randomize these settings in order to make the sandbox less 'fingerprintable' I have looked at OpenVZ and KVM so far. Are there any other VMs that I might look at? What do you recommend?

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How can a CentOS 6 guest running in VirtualBox be configured as a LAMP server that can be accessed from the Windows host?

- by jtt89

I was able to conect Centos6 on Virtual Box to Windows (I can ping in both directions) with Host-only Adapter (for connection between the two) and NAT Adapter (to enable Linux on VB to connect to the Internet). I want to set up httpd, mysql and vsftpd servers and in the end easily connect to httpd from Windows based browser and ftp server with a Windows based client as well. I would also want to have access through SSH. I have a general idea of the steps that are involved, but there is also a configuration that I am not sure about at this point. Lets say I follow these steps: yum install httpd yum install php php-pear php-mysql yum install mysql-server mysql_secure_installation yum install vsftpd yum install mod_ssl Technically I have everything installed, but what would be the next steps that I need to take (from the networking point of view, so to speak) to get it all working)? I know I need to configure, at least Apache, and ftp server, but I am not sure how is it gonna work; like where am I gonna be uloading the sites (I know this can vary), how am I gonna know what address to use in a browser if I wanna go to a website x, y, z on that installation etc. This sounds like I need to do some kind of DNS setup and I am kind of stuck at this point. If somebody could give me a general outline of what are the things that need to be done that would be great (I was looking at a lot of websites and I know about etc/sysconfig/network, httpd.config - not too much about it on Apache's site, hostname, hostname -f etc; but it is kind of hard to piece it all together at this point). I am gonna be looking at the books also, but they not always reflect the setup that I have too (VirtualBox). Thank you.

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NRPE unable to read output, but why?

- by ticktockhouse

I have this problem with NRPE, all the stuff I've found so far on the net seems to point me at things I've already tried. # /usr/local/nagios/plugins/check_nrpe -H nrpeclient gives NRPE v2.12 as expected. Running the command by hand (as defined in nrpe.cfg on "nrpeclient", gives the expected response nrpe.cfg: command[check_openmanage]=/usr/lib/nagios/plugins/additional/check_openmanage -s -e -b ctrl_driver=0 bat_charge "Expected response" But if I try to run the command from the Nagios server I get the following: # /usr/local/nagios/plugins/check_nrpe -H comxps -c check_openmanage NRPE: Unable to read output Can anyone think of anywhere else I might have made a mistake with this? I've done the same thing on multiple other servers with no problem. The only difference I can think of with this is that this box is RHEL 5 based, whereas the others are RHEL 4 based. Those two bits above that I've tested are the what most people seem to suggest when people have had this problem. I should mention that I get a weird error in the logs when I restart nrpe: nrpe[14534]: Unable to open config file '/usr/local/nagios/etc/nrpe.cfg' for reading nrpe[14534]: Continuing with errors... nrpe[14535]: Starting up daemon nrpe[14535]: Warning: Daemon is configured to accept command arguments from clients! nrpe[14535]: Listening for connections on port 5666 nrpe[14535]: Allowing connections from: bodbck,combck,nam-bck Even though, it's plainly reading that /usr/local/nagios/etc/nrpe.cfg file to get the stuff it's talking about further down..

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Parsing the output of "uptime" with bash

- by Keek

I would like to save the output of the uptime command into a csv file in a Bash script. Since the uptime command has different output formats based on the time since the last reboot I came up with a pretty heavy solution based on case, but there is surely a more elegant way of doing this. uptime output: 8:58AM up 15:12, 1 user, load averages: 0.01, 0.02, 0.00 desired result: 15:12,1 user,0.00 0.02 0.00, current code: case "`uptime | wc -w | awk '{print $1}'`" in #Count the number of words in the uptime output 10) #e.g.: 8:16PM up 2:30, 1 user, load averages: 0.09, 0.05, 0.02 echo -n `uptime | awk '{ print $3 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $4,$5 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $8,$9,$10 }' | awk '{gsub ( ",","" ) ; print $0 }'`"," ;; 12) #e.g.: 1:41pm up 105 days, 21:46, 2 users, load average: 0.28, 0.28, 0.27 echo -n `uptime | awk '{ print $3,$4,$5 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $6,$7 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $10,$11,$12 }' | awk '{gsub ( ",","" ) ; print $0 }'`"," ;; 13) #e.g.: 12:55pm up 105 days, 21 hrs, 2 users, load average: 0.26, 0.26, 0.26 echo -n `uptime | awk '{ print $3,$4,$5,$6 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $7,$8 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $11,$12,$13 }' | awk '{gsub ( ",","" ) ; print $0 }'`"," ;; esac

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ZFS - Impact of L2ARC cache device failure (Nexenta)

- by ewwhite

I have an HP ProLiant DL380 G7 server running as a NexentaStor storage unit. The server has 36GB RAM, 2 LSI 9211-8i SAS controllers (no SAS expanders), 2 SAS system drives, 12 SAS data drives, a hot-spare disk, an Intel X25-M L2ARC cache and a DDRdrive PCI ZIL accelerator. This system serves NFS to multiple VMWare hosts. I also have about 90-100GB of deduplicated data on the array. I've had two incidents where performance tanked suddenly, leaving the VM guests and Nexenta SSH/Web consoles inaccessible and requiring a full reboot of the array to restore functionality. In both cases, it was the Intel X-25M L2ARC SSD that failed or was "offlined". NexentaStor failed to alert me on the cache failure, however the general ZFS FMA alert was visible on the (unresponsive) console screen. The zpool status output showed: pool: vol1 state: ONLINE scan: scrub repaired 0 in 0h57m with 0 errors on Sat May 21 05:57:27 2011 config: NAME STATE READ WRITE CKSUM vol1 ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 c8t5000C50031B94409d0 ONLINE 0 0 0 c9t5000C50031BBFE25d0 ONLINE 0 0 0 mirror-1 ONLINE 0 0 0 c10t5000C50031D158FDd0 ONLINE 0 0 0 c11t5000C5002C823045d0 ONLINE 0 0 0 mirror-2 ONLINE 0 0 0 c12t5000C50031D91AD1d0 ONLINE 0 0 0 c2t5000C50031D911B9d0 ONLINE 0 0 0 mirror-3 ONLINE 0 0 0 c13t5000C50031BC293Dd0 ONLINE 0 0 0 c14t5000C50031BD208Dd0 ONLINE 0 0 0 mirror-4 ONLINE 0 0 0 c15t5000C50031BBF6F5d0 ONLINE 0 0 0 c16t5000C50031D8CFADd0 ONLINE 0 0 0 mirror-5 ONLINE 0 0 0 c17t5000C50031BC0E01d0 ONLINE 0 0 0 c18t5000C5002C7CCE41d0 ONLINE 0 0 0 logs c19t0d0 ONLINE 0 0 0 cache c6t5001517959467B45d0 FAULTED 2 542 0 too many errors spares c7t5000C50031CB43D9d0 AVAIL errors: No known data errors This did not trigger any alerts from within Nexenta. I was under the impression that an L2ARC failure would not impact the system. But in this case, it surely was the culprit. I've never seen any recommendations to RAID L2ARC. Removing the bad SSD entirely from the server got me back running, but I'm concerned about the impact of the device failure (and maybe the lack of notification from NexentaStor as well). Edit - What's the current best-choice SSD for L2ARC cache applications these days?

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ESXI 5.1 - Unable to trunk to cisco switch

- by Lance

I have configured my esxi host vSwitch1 to use the secondary NIC on my VMware host. On vSwitch1 configuration I have set the VLAN to 4095 which specifies to allow all VLANs. If my cisco switch port configuration is set to an access port my server can ping the vlan interface on the switch. If my cisco switch port configuration is set to a trunk, whilst it stays UP UP and CDP information is available, I lose my ping from VMware VM server to the local vlan interface on the switch and I lose any server connectivity to my network. Switch NIC teaming policy to Route based on originating virtual port ID Configuration based on: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006628 interface GigabitEthernet0/42 description Host Port switchport trunk encapsulation dot1q switchport trunk allowed vlan 18,220 switchport mode trunk switchport nonegotiate spanning-tree portfast trunk end Output from ESXI CLI esxcfg-vswitch -l: ~ # esxcfg-vswitch -l Switch Name Num Ports Used Ports Configured Ports MTU Uplinks vSwitch0 128 5 128 1500 vmnic0 PortGroup Name VLAN ID Used Ports Uplinks VM Network 4095 1 vmnic0 Management Network 4095 1 vmnic0 Switch Name Num Ports Used Ports Configured Ports MTU Uplinks vSwitch1 128 4 128 1500 vmnic1 PortGroup Name VLAN ID Used Ports Uplinks VM Network 2 4095 1 vmnic1 Any tips welcome!!!

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CPU and Motherboard clock speeds

- by NZHammer

I have been doing some reading about CPU clock speeds and how CPU clock speeds are calculated. After reading several articles, I have come to the understanding that your CPU clock speed is determined by: CPU clock speed = cpu multiplier x mobo clock speed A few questions came about after reading this which I cannot seem to find the answer to anywhere: If the CPU clock speed is dependent upon the mobo clock speed, then how is the clock speed of the CPU predetermined upon buying the CPU (i.e. written on the box without knowing what mobo is being used)? After installation, does the CPU adjust it's multiplier based upon the mobo clock speed to achieve advertised speeds? For example, if the CPU clocks speed is advertised at 2.4GHz and the mobo clock speed is 100MHz, will the multiplier be automatically set to 24x? Why does mobo clock speed seem to not be very important / talked about? For example, when I search on Newegg, mobo clock speed never seems to be listed. When I search enthusiast forums and overclocking forums, mobo clock speed is rarely mentioned. To me, it seems like the mobo clock speed would be pretty important. If I am understanding things correctly, a lower mobo clock speed means that you CPU must work harder to achieve advertised clock speeds. I guess that I should stop there with the questions for now, as I may be asking my questions based on incorrect assumptions. Thanks!

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iSCSI, failover and XenServer

- by jemmille

I have an iSCSI fail over implementation setup so if one of my storage units fails the other takes over immediately (it also runs the NFS shares). When fail over occurs, volumes are exported, the IP is switched to the other machine and the targets are reconfigured. The fail over of the storage system itself works just fine. I use NexentaStor for my filer. When I do a test (manual) fail over of my storage the following occurs: Note: I run the admin VM's on NFS and customer based VM's on iSCSI All NFS based VM's remain up and working perfectly through the failover and after All VM 's running on iSCSI eventually report the following: An error about not being able to write to a particular block An error about journaling not working Then the file system goes RO To get the VM's working again I have to do the following: Force shutdown of the "broken" VM's. Detach the iSCSI SR Re-attach the iSCSI SR Boot the VM on a different server (5 in my pool) If I don't boot on a different server I get this error "Internal error: Failure("The VDI <uuid> is already attached in RW mode; it can't be attached in RO mode!")" The only way I have found to fix that error is to reboot the entire server it was running on previously which is obviously a huge pain. Currently multipathing is NOT enabled (but can be and the same thing still occurs). I have edited much of the /etc/iscsid.conf file to work with the timeout settings but to no avail. In short, my storage fails over properly but XenServer does not keep the connection alive. As a thought, the error that shows up in #4 above might be the ultimate cause and fixing that would fix everything? Any help would be appreciated more than you know.

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