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• Almost All Xenserver Logical Volumes Disappeared - Recovery?

  - by Alex

  We had a hard disc crash of one of two hard discs in a software raid with a LVM on top. The server is running Citrix xenserver. On the hard disk which is still intact, the volume group gets detected well, but only one LV is left. (some hashes replaced by "x") # lvdisplay --- Logical volume --- LV Name /dev/VG_XenStorage-x-x-x-x-408b91acdcae/MGT VG Name VG_XenStorage-x-x-x-x-408b91acdcae LV UUID x-x-x-x-x-x-vQmZ6C LV Write Access read/write LV Status available # open 0 LV Size 4.00 MiB Current LE 1 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 root@rescue ~ # vgdisplay --- Volume group --- VG Name VG_XenStorage-x-x-x-x-408b91acdcae System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 698.62 GiB PE Size 4.00 MiB Total PE 178848 Alloc PE / Size 1 / 4.00 MiB Free PE / Size 178847 / 698.62 GiB VG UUID x-x-x-x-x-x-53w0kL I could understand if a full physical volume is lost - but why only the logical volumes? Is there any explanation for this? Is there any way to recover the logical volumes? EDIT We are here in a rescue system. The problem is that the whole server does not boot (GRUB error 22) What we are trying to do is to access the root filesystem. But everything was in the LVM. We have only this: (parted) print Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 750GB 750GB primary boot, lvm And this 750GB LVM volume is exactly what we see on top. edit2 Output of vgcfgrestore, but from the rescue system, as there is no root to chroot to. # vgcfgrestore --list VG_XenStorage-x-b4b0-x-x-408b91acdcae File: /etc/lvm/archive/VG_XenStorage-x-x-x-x-408b91acdcae_00000.vg VG name: VG_XenStorage-x-x-x-x-408b91acdcae Description: Created *before* executing '/sbin/vgscan --ignorelockingfailure --mknodes' Backup Time: Fri Jun 28 23:53:20 2013 File: /etc/lvm/backup/VG_XenStorage-x-x-x-x-408b91acdcae VG name: VG_XenStorage-x-x-x-x-408b91acdcae Description: Created *after* executing '/sbin/vgscan --ignorelockingfailure --mknodes' Backup Time: Fri Jun 28 23:53:20 2013

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• Setting up /etc/network/interface file for KVM ubuntu 10.10

  - by Charles Thornton

  I am trying to setup KVM on Unbuntu 10.10 IFCONFIG DUMP: hydra(~}$ifconfig eth0 Link encap:Ethernet HWaddr 00:1b:fc:cb:77:eb inet addr:172.20.20.3 Bcast:172.20.20.255 Mask:255.255.255.0 inet6 addr: fe80::21b:fcff:fecb:77eb/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1345 errors:0 dropped:0 overruns:0 frame:0 TX packets:1541 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:820414 (820.4 KB) TX bytes:317708 (317.7 KB) Interrupt:23 Base address:0xc000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:8 errors:0 dropped:0 overruns:0 frame:0 TX packets:8 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:480 (480.0 B) TX bytes:480 (480.0 B) virbr0 Link encap:Ethernet HWaddr 0a:1e:fb:b4:77:84 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 inet6 addr: fe80::81e:fbff:feb4:7784/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:56 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:8934 (8.9 KB) hydra(~}$ QUESTION:: How should /etc/network/interfaces be setup?? The following attempt just kills my internet connection! --------- /etc/network/interfaces ------------- # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet manual auto br0 iface br0 inet static address 172.20.20.3 netmask 255.255.255.0 network 172.20.20.0 broadcast 172.20.20.255 gateway 172.20.20.1 bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off What am I doing wrong????

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• Windows Not Honoring DHCP Scope

  - by jerhinesmith

  Please bear with me as I'm not a networking person by trade. Our current configuration at work includes two Windows Servers serving as DHCP/Active Directory servers (if that makes sense) -- one replicating from the other. On both machines, the DNS resolution is set up as: Main Windows Box (10...* address) Public IP Address (for Verizon) Public IP Address (secondary Verizon) Secondary Windows Box (10...* address) Assuming our domain is foo.com, we maintain the foo.com website on a hosted VPS with it's own IP address. The problem is that even though bar.foo.com is an internal server and is defined in DNS on the Primary Windows machine, when I ping bar or even bar.foo.com it resolves to the hosted IP address instead of the 10.* address. I tried taking both of the Public IP addresses out of the DHCP scope, and that seemed to work, but it completely slowed down access to any external sites, so that wasn't acceptable. I also tried adding the two Windows machine as the DNS servers on my desktop. That too worked, but I'd rather not have everything enter their DNS servers, as the above setup should theoretically be working. Is there anything I could check to see why pinging bar.foo.com isn't resolving to the DNS entry on the Windows machines? Here's a summary of the ping results, if they help: Pinging from servers with static IP bar.foo.com resolves with correct IP address Pinging from linux machines not joined to the domain bar.foo.com resolves with correct IP address Pinging from user's desktop machines, joined to the domain, but dynamic IP bar.foo.com resolves with incorrect IP address This is driving me crazy!

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• Recommended drive encryption solution

  - by Chris Driver

  Hello, I will soon be purchasing a number of laptops running Windows 7 for our mobile staff. Due to the nature of our business I will need drive encryption. Windows BitLocker seems the obvious choice, but it looks like I need to purchase either Windows 7 Enterprise or Ultimate editions to get it. Can anyone offer suggestions on the best course of action: a) Use BitLocker, bite the bullet and pay to upgrade to Enterprise/Ultimate b) Pay for another 3rd party drive encryption product that is cheaper (suggestions appreciated) c) Use a free drive encryption product such as TrueCrypt Ideally I am also interested in 'real world' experience from people who are using drive encryption software and any pitfalls to look out for. Many thanks in advance... UPDATE Decided to go with TrueCrypt for the following reasons: a) The product has a good track record b) I am not managing a large quantity of laptops so integration with Active Directory, Management consoles etc is not a huge benefit c) Although eks did make a good point about Evil Maid (EM) attacks, our data is not that desirable to consider it a major factor d) The cost (free) is a big plus but not the primary motivator The next problem I face is imaging (Acronis/Ghost/..) encrypted drives will not work unless I perform sector-by-sector imaging. That means an 80Gb encrypted partition creates an 80Gb image file :(

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• How can I create a VLAN on my extreme switch for a seperate subnet/domain?

  - by drpcken

  I'm putting together a small active directory implementation for a buddy of mine. I currently have 2 servers (one is the primary domain controller) and a couple clients. I need to test and run updates on every machine on this domain, but I would have plug them into my current LIVE domain to get it internet access. From what I've read having two separate domains on a single subnet is a bad idea (even though it is temporary) so I don't want to risk messing anything up on my production domain. I'm pretty sure I can create a separate VLAN on my extreme 48 port switch and plug this smaller domain into it on a different subnet, but I don't know the commands. Both subnets would need internet access of course (one of the things I can't wrap my head around is routing internet traffic between subnets (gateway is on production subnet). My production domain is on subnet 192.168.200.0. My new domain I want to put online would go into subnet 192.168.10.0. A shove in the right direction would be greatly appreciated. Thank you!

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• Using the full width of an Excel chart with two Y-axes

  - by Jørn Schou-Rode

  I am trying to create a line chart in MicrosoftExcel 2007 with two data series, each with their own Y-axis. First, I create a simple chart by selecting the two data series, and choosing Insert > Charts > Line from the Ribbon. I now see the following chart in my workbook: I then continue my quest by right clicking one of the data series (lines) and choosing Format data series > Series Options > Secondary Axis. My chart is now looks like this: This is almost what I want. I did not expect to see the gap between the last X-axis tick point (x = 5) and the secondary (right most) Y-axis. Why does Excel introduce this gap? Is there anything I can do to avoid it? I have tried right clicking the X-axis and seleting Format Axis > Axis Options > Position Axis: Between tick marks, but that only introduces a similar gap on by the primary (left most) Y-axis.

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• amplified reflected attack on dns

  - by Mike Janson

  The term is new to me. So I have a few questions about it. I've heard it mostly happens with DNS servers? How do you protect against it? How do you know if your servers can be used as a victim? This is a configuration issue right? my named conf file include "/etc/rndc.key"; controls { inet 127.0.0.1 allow { localhost; } keys { "rndc-key"; }; }; options { /* make named use port 53 for the source of all queries, to allow * firewalls to block all ports except 53: */ // query-source port 53; /* We no longer enable this by default as the dns posion exploit has forced many providers to open up their firewalls a bit */ // Put files that named is allowed to write in the data/ directory: directory "/var/named"; // the default pid-file "/var/run/named/named.pid"; dump-file "data/cache_dump.db"; statistics-file "data/named_stats.txt"; /* memstatistics-file "data/named_mem_stats.txt"; */ allow-transfer {"none";}; }; logging { /* If you want to enable debugging, eg. using the 'rndc trace' command, * named will try to write the 'named.run' file in the $directory (/var/named"). * By default, SELinux policy does not allow named to modify the /var/named" directory, * so put the default debug log file in data/ : */ channel default_debug { file "data/named.run"; severity dynamic; }; }; view "localhost_resolver" { /* This view sets up named to be a localhost resolver ( caching only nameserver ). * If all you want is a caching-only nameserver, then you need only define this view: */ match-clients { 127.0.0.0/24; }; match-destinations { localhost; }; recursion yes; zone "." IN { type hint; file "/var/named/named.ca"; }; /* these are zones that contain definitions for all the localhost * names and addresses, as recommended in RFC1912 - these names should * ONLY be served to localhost clients: */ include "/var/named/named.rfc1912.zones"; }; view "internal" { /* This view will contain zones you want to serve only to "internal" clients that connect via your directly attached LAN interfaces - "localnets" . */ match-clients { localnets; }; match-destinations { localnets; }; recursion yes; zone "." IN { type hint; file "/var/named/named.ca"; }; // include "/var/named/named.rfc1912.zones"; // you should not serve your rfc1912 names to non-localhost clients. // These are your "authoritative" internal zones, and would probably // also be included in the "localhost_resolver" view above :

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• Puzzling TCP performance over 3G / UMTS

  - by lemonsqueeze

  I'm using 3G as my primary internet connection, and TCP over this thing is getting more puzzling every day. For example: Downloading from kernel.org is crazy fast: $wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.6.8.tar.bz2 increases to ~500kB/s after a few secs ! Some servers are incredibly slow, for instance www.graphic-pc.com:Same thing, downloading a big file with wget it starts at ~30kB/s for a split second, then collapses to 5-10k or even worse. Web browsing is decent but somewhat unreliable. Randomly, a page will take really long to load or even fail to load, but a reload can succeed almost immediately. Now, by chance i started playing with OpenVPN over UDP on top of the 3G connection, and OMG suddenly everything's extremely fast !Same www.graphic-pc.com now shoots at 100-200kB/s ! What's going on here ??? How come it is so much better with the VPN than without ?? And why does graphic-pc.com crawl when kernel.org flies ?Something to do with my tcp stack (or the server), or some buggy router in between ?? Notes: Setup is laptop running Ubuntu Lucid and a Huawei 3G dongle (So direct pppd connection). I can reproduce this pretty much any time during the day and I'm not moving, so it's clearly not cell environment or internet congestion. (although kernel.org without VPN sometimes does worse in the evening, 60kB or so - but still 500kB with VPN !) For 2) wireshark shows retransmitted packets, dup ack's, even out of order sometimes. I've tried playing with different /proc/sys/net/ipv4 parameters (tcp_rmem, window_scaling, tcp_congestion...) doesn't seem to make a difference. Update: Tried under windows 7 (no VPN) with some interesting results: tcp settings : default tcp_optimizer kernel.org : 10 kB/s 20 kB/s graphic-pc.com: 8 kB/s 70 kB/s ! tcp_optimizer turned on ctcp among other things. Have to check what os graphic-pc.com is running, my bet is linux's tcp_westwood and ms ctcp don't mix well here...

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• Is there a standard method for assigning nameservers to servers in a Windows domain?

  - by HopelessN00b

  As the title asks, I'm wondering if there's any standard or "best practice" for how to actually assign nameservers (DNS) and manage the nameserver configuration for client servers on a Windows domain. I'm talking about the setting circled in the below image, in case the language of the question is not clear enough: This is for a large, multi-site environment, where ideally/hopefully all servers point at their site's Domain Controller as the primary DNS server, and a DNS server at a different site as the secondary DNS server. For simplicity's sake, we can say that the secondary server would be the Domain Controller at the home site for everyone, and there are no tertiary DNS servers (even though that's not actually the case). Try as I might, I can't seem to find a GPO setting for this (at least on FL 2003 R2, the Computer Configuration - Administrative Templates - Network - DNS Client - DNS Servers GPO is Supported on: Windows XP Professional only), and I find it rather hard to believe that the "best"/"standard" solution would therefore be either scripting up something to apply the DNS settings per site, or using a DHCP server to push those configurations out to the other servers via the DHCP Scope Options. So, is there a standard way of managing this configuration? (That's hopefully not "a script" or "DHCP Scope Option.)

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• "Error 53" with local LAN machines after VPN session on server

  - by tim11g

  I have a Windows 2000 server with a Windows 7 client that occasionally gets "error 53" when accessing the server by name (net view \\server). It still works by IP address (net view \\192.168.0.1). The server's primary IP address (as shown in "routing and remote access" as "Gigabit Ethernet" is 192.168.0.1. There is also a secondary IP address shown as "Internal" which is 192.168.0.50 The server also supports VPN. When a VPN user connects, it gets an address in the range of 192.168.0.51 to .59. Normally (when there is no error), when the local LAN client runs "ping server", it resolves to 192.168.0.1. When the Error 53 problem happens, "ping server" resolves to 192.168.0.50. This problem seems to be related to when a user connects or has recently connected to the server VPN. Is there some connection between the VPN services on the server and the DNS services on the server that could cause a local LAN client to become confused about which IP address to use for the server? Or is there a misconfiguration in the VPN or DNS?

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• Discrepancy in file size on disk and ls output

  - by smokinguns

  I have a script that checks for gzipped file sizes greater than 1MB and outputs files along with their sizes as a report. This is the code: myReport=`ls -ltrh "$somePath" | egrep '\.gz$' | awk '{print $9,"=>",$5}'` # Count files that exceed 1MB oversizeFiles=`find "$somePath" -maxdepth 1 -size +1M -iname "*.gz" -print0 | xargs -0 ls -lh | wc -l` if [ $oversizeFiles -eq 0 ];then status="PASS" else status="CHECK FAILED. FOUND FILES GREATER THAN 1MB" fi echo -e $status"\n"$myReport The problem is that ls command outputs the files sizes as 1.0MB in the report but the status is "FAIL" as "$oversizeFiles" variable's value is 2. I checked the file sizes on disk and 2 files are 1.1MB. Why this discrepancy? How should I modify the script so that I can generate an accurate report? BTW, I'm on a Mac. Here is what man page for "find" says on my Mac OSX: -size n[ckMGTP] True if the file's size, rounded up, in 512-byte blocks is n. If n is followed by a c,then the primary is true if the file's size is n bytes (characters). Similarly if n is followed by a scale indicator then the file's size is compared to n scaled as: k kilobytes (1024 bytes) M megabytes (1024 kilobytes) G gigabytes (1024 megabytes) T terabytes (1024 gigabytes) P petabytes (1024 terabytes)

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• Disk doesn't contain a valid partition table

  - by Jeevan Dongre

  I was running a m1.small instance ec2 ubuntu instance. I was running out of disk space, so I upgraded my instance to medium. When I upgraded I actually got 429.5 GB of space and after that I added 10 gb of volume too. When I run the "sudo fdisk -l" command I got this results. Disk /dev/sda1: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sda1 doesn't contain a valid partition table Disk /dev/sda2: 429.5 GB, 429461078016 bytes 255 heads, 63 sectors/track, 52212 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sda2 doesn't contain a valid partition table Disk /dev/sdf: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 sda1 is the primary parition and sda2 is what I got added upgrading my system to medium. But the problem persists, I am not able to pull the code from git, it is giving me this error. remote: Counting objects: 409, done. remote: Compressing objects: 100% (236/236), done. fatal: write error: No space left on device fatal: index-pack failed

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• Can't start Windows 7 after cloning HDD

  - by Paul

  Brief description: cloned HDD1 - HDD2 HDD1 partition 1 boots HDD1 partition 2 boots HDD2 partition 1 boots HDD2 partition 2 doesn't boot Windows, but is bootable in general Now verbosely: In all the cases computer is the same. I have two Windows 7 installations on HDD1 - both are booting fine. I choose between them using standard Windows 7 boot loader menu. Technically there are 4 partitions: 100 MB Boot loader partition (active), Windows 7 copy 1 (25 GB), Windows 7 copy 2 (150 GB) and Working partition. All are primary. In past few days I tried to clone the whole HDD1 to HDD2 of the same size (but 2,5 inch form factor) as is using Minitool Partition wizard. Everything has been copied, all files are accessible, no faults in file system structure, even boot loader wasn't damaged and I hadn't to repair it. But I can boot only first installation of Windows 7 (it boots without issues). When I choose the second installation, I get immediately a completely black screen without any texts, cursors and other data. HDD isn't accessed after that. This black screen is sensitive to Ctrl-Alt-Delete which causes computer reboot. I did some experimenting: Installed Windows 7 to that partition - it booted fine. Then I renamed "Windows" to "Windows.old" and copied Windows directory from HDD1 as it was, using Far Manager, and got the same troubles - black screen. (Of course I performed renaming and copying from other copy of Windows). So, it seems that problems are inside this installation of Windows, somewhere in its files.

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• Can't find partition tab in disk utility osX ver. 10.6.8

  - by John W

  I just got a used Mac Book Pro. I created a new admin account and deleted the old one as well as one other user. This is an older late 2007 MBP... the osX upgrade to 10.6.8 was just performed. My Macintosh HD is showing up as Partition 2. I ran disk utility (not from install disk), but there was no partition tab. I have a 160GB drive with only 53GB of space left on it. Since I am the only user and have no files on the laptop yet, I don't understand why there is so little space left. Surely the OS can't use up over 100GB. I wanted to run disk utility to see if there were any recovery partitions or other partition left over from the previous owner that could be erased to make room for expanding the main partition. Unfortunately, there is no partition tab in disk utility. The documentation I have found on line states that this version of osX includes that utility. The osX disks I have are for an older version so I wasn't sure if they would be of any use in solving this problem. Also, I was afraid if using the disks, would I lose the little bit of data/apps that I have assembled. I would rather not do a fresh install and have to do all the updates again to achieve this. The previous owner had some apps that I don't want to lose as I would have to pay handsomely to get them back. Simply, if all the previous users data is backed up on here after deleting user is still taking up space on a recovery partition (that I can't see)... I need to locate it erase it and expand the primary partition to re-aquire disk space for my files. I am new to Mac, so please be as descriptive as possible. Thanks.

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• Nginx Ubuntu Postfix Config - Can't connect to incoming IMAP server 'server not responding' but can send mail via outgoing using same details?

  - by daveaspinall

  I'm pretty to new server admin and especially nginx but seem to be getting ok fine apart from accessing my mail via my iPhone? I've changed my domain to 'domain.com' The thing is I can send mail via my outgoing IMAP server but can't connect to the incoming one? I just get the message "the mail server at mail.domain.com is not responding" /etc/postfix/main.cf 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 home_mailbox = Maildir/ inet_interfaces = all inet_protocols = all mailbox_command = mailbox_size_limit = 0 mydestination = domain.com, mail.domain.com, localhost.com, , localhost, localhost.localdomain mydomain = domain.com myhostname = mail.domain.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname recipient_delimiter = + relayhost = smtp_tls_note_starttls_offer = yes smtp_tls_security_level = may smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = smtpd_sasl_security_options = noanonymous smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem smtpd_tls_auth_only = no smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt smtpd_tls_key_file = /etc/ssl/private/smtpd.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_security_level = may smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom telnet localhost 25 ehlo locahost 250-mail.domain.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN Using the following details to connect: username password hostname: mail.domain.com port: 25 iptables --list Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination I also sent mail to the server as a test and got this missage if it helps? Technical details of temporary failure: [mail.domain.com. (10): Connection refused] I also looked in /var/log/mail.log and it has multiple entries of: postfix/smtpd[12239]: connect from 5acefc9a.bb.sky.com[90.206.252.xxx] Mar 23 06:47:09 new-domain postfix/smtpd[12239]: lost connection after CONNECT from 5acefc9a.bb.sky.com[90.206.252.154] Notice new-domain which is incorrect but the server hostname and hostname in the configs are correct? I recently moves servers and the host has set the primary domain on the service as new-domain.com so this may be the issue? Like I said, it works to connect to outgoing server, but incoming gets the not responding error? Any idea would be much appreciated!

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• glusterfs mounts get unmounted when 1 of the 2 bricks goes offline

  - by Shiquemano

  I have an odd case where 1 of the 2 replicated glusterfs bricks will go offline and take all of the client mounts down with it. As I understand it, this should not be happening. It should fail over to the brick that is still online, but this hasn't been the case. I suspect that this is due to configuration issue. Here is a description of the system: 2 gluster servers on dedicated hardware (gfs0, gfs1) 8 client servers on vms (client1, client2, client3, ... , client8) Half of the client servers are mounted with gfs0 as the primary, and the other half are pointed at gfs1. Each of the clients are mounted with the following entry in /etc/fstab: /etc/glusterfs/datavol.vol /data glusterfs defaults 0 0 Here is the content of /etc/glusterfs/datavol.vol: volume datavol-client-0 type protocol/client option transport-type tcp option remote-subvolume /data/datavol option remote-host gfs0 end-volume volume datavol-client-1 type protocol/client option transport-type tcp option remote-subvolume /data/datavol option remote-host gfs1 end-volume volume datavol-replicate-0 type cluster/replicate subvolumes datavol-client-0 datavol-client-1 end-volume volume datavol-dht type cluster/distribute subvolumes datavol-replicate-0 end-volume volume datavol-write-behind type performance/write-behind subvolumes datavol-dht end-volume volume datavol-read-ahead type performance/read-ahead subvolumes datavol-write-behind end-volume volume datavol-io-cache type performance/io-cache subvolumes datavol-read-ahead end-volume volume datavol-quick-read type performance/quick-read subvolumes datavol-io-cache end-volume volume datavol-md-cache type performance/md-cache subvolumes datavol-quick-read end-volume volume datavol type debug/io-stats option count-fop-hits on option latency-measurement on subvolumes datavol-md-cache end-volume The config above is the latest attempt at making this behave properly. I have also tried the following entry in /etc/fstab: gfs0:/datavol /data glusterfs defaults,backupvolfile-server=gfs1 0 0 This was the entry for half of the clients, while the other half had: gfs1:/datavol /data glusterfs defaults,backupvolfile-server=gfs0 0 0 The results were exactly the same as the above configuration. Both configs connect everything just fine, they just don't fail over. Any help would be appreciated.

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• restrict access to IIS virtual directory from root website

  - by senthilkumar-c

  Hi, I have two domains (domain1.com and domain2.com). Both of them use the same Windows hosting service with IIS7. One of the domains is being called the "primary domain" by my hosting provider and it always points to the root folder that I was given. For the other domain, I have created a virtual directory in IIS and pointed it there. The folder structure is like this - root --Default.aspx --domain2folder ----Default.aspx So, if I type domain1.com, I see the regulakr Default.aspx. But if I type domain2.com, I am shown the contents of domain2folder as if it were a separate web application - I think that is what IIS virtual directory is meant for. Well and good. But the problem is, when I type http://domain1.com/domain2folder/, I see the domain2's website! But I don't want that to be shown when I use the path like that from domain1. Only if they use domain2.com, user should be able to see those contents. How can I do that? Hope I am making sense. Thanks.

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• At what point does the performance gap between GPU & CPU become so great that the CPU is holding back a system?

  - by Matthew Galloway

  I know that generally speaking for gaming performance the GPU is the primary factor which holds back performance, with everything else such as RAM/motherboard/PSU/CPU being secondary in importance to the graphics card. But at some point the other components ARE going to be significant in holding back the whole system! For instance nobody would be silly enough to play modern games with 512MB RAM and the very latest graphics cards (such as an HD7970) as I bet the performance increase over such a system with only 512MB but a mid range card would be non-existent! Thus it would be a "waste" for such a person to buy any high end graphics card without resolving first the system's other problems. The same point applies to other components, such as if it only had a Pentium II a current high end graphics card would be wasted on it! So my core question is how do you determine at what point for your system is spending on extra GPU power be completely "wasted"? (also, a slightly more nuanced question is trying work out at what point might the extra graphics power not be "wasted" but would be "sub optimal" value for money, when the expenditure should then be split around graphics card and other components. As obviously a gamer shouldn't always just spend on upgrading the graphics card! But needs to balance it out)

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• Assign individual NIC to KVM guest

  - by Bin S

  I have a server with 6 NICs installed and is running Ubuntu 12.04LTS. I want to setup 4 guest VMs using kvm. Now I want to assign 2 NICs for the host(1 Public IP and 1 private IP), and 1 NIC each to 4 guest VM(all private IP). How do I do this? /etc/network/interfaces I am having trouble with my configuration file shown below: # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 192.168.1.109 netmask 255.255.255.0 gateway 192.168.1.5 auto eth1 iface eth1 inet static address 192.168.1.117 netmask 255.255.255.0 auto eth2 iface eth2 inet manual auto br0 iface br0 inet static address 192.168.1.118 netmask 255.255.255.0 bridge_ports eth2 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off auto eth3 iface eth3 inet manual auto br1 iface br1 inet static address 192.168.1.119 netmask 255.255.255.0 bridge_ports eth3 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off auto eth4 iface eth4 inet manual auto br2 iface br2 inet static address 192.168.1.123 netmask 255.255.255.0 bridge_ports eth4 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off auto eth5 iface eth5 inet manual auto br3 iface br3 inet static address 192.168.1.124 netmask 255.255.255.0 bridge_ports eth5 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off

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• Triple-Boot + 4 partition Limit

  - by dsimcha

  I just bought a new hard drive so that I could convert my XP-only machine into an XP-Ubuntu-Windows 7 triple boot machine. Since the drive is absurdly huge (1 TB) I wouldn't mind throwing ReactOS into the mix, too. I just found out that master boot records are limited to 4 entries, meaning 4 primary partitions. I had Windows XP set up on my old drive as a boot partition, a program files partition and a media partition. Since I really didn't want to install XP from scratch, I cloned this setup on my new drive. This leaves me one MBR partition entry for installing Windows 7, Ubuntu and ReactOS. I'd like to avoid having to install XP from scratch like the plague, partly because it's supposed to be a safety net in case things go wrong with my other OS's and because I've invested a lot of time getting it set up exactly the way I like it. Here are the options I've considered and why I don't like them: Install Windows 7 on my media partition. This would work, but I prefer to keep my media partition completely separate from any OS, so that I can reformat an OS partition without affecting my media partition at all. Use wubi or something to install Ubuntu in the same partition as something else. Again, this is brittle. Move all my media to a logical drive on an extended partition. Create another logical drive on this extended partition for Ubuntu. The problem here is that extended partitions are rather brittle--if you nuke one, it renders the rest useless. Just put the old drive back in my computer and run XP off it. Use the new one for the other OS's. The problem here is that the old drive is slower and uses extra power, generates extra heat, etc. Can anyone suggest any other possibilities that I may have overlooked?

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• Issue in nginx proxying to apache

  - by Luis Masuelli

  My current nginx configuration is as follows: specific configuration for (currently two) domains: server { listen 443 ssl; server_name studiotv.service.tebusco.lan phpmyadmin.service.tebusco.lan; ssl_certificate /home/administrador/nginx-confs/ssl/service.tebusco.lan.crt; ssl_certificate_key /home/administrador/nginx-confs/ssl/service.tebusco.lan.key; location / { proxy_pass http://127.0.0.1:8180; proxy_set_header Host $http_host:8180; } } default configuration for unmatched ssl connections: server { listen 443 default ssl; ssl_certificate /home/administrador/nginx-confs/ssl/service.tebusco.lan.crt; ssl_certificate_key /home/administrador/nginx-confs/ssl/service.tebusco.lan.key; location / { return 403; } } http configuration: server { listen 80; rewrite ^ https://$host$request_uri? permanent; } The intention is clear: Redirect http traffic to https. Proxy each https:// call from phpmyadmin.service.tebusco.lan and studiotv.service.tebusco.lan to apache2. This includes passing a host header, which is detected. Each unmatched ssl connection must return a 403 in nginx. Does not even reach apache2. In the apache2 side of the life, I have a default site, and a non-default site which will match studiotv.service.tebusco.lan: 000-default.conf file (available and enabled): <VirtualHost 127.0.0.1:8180> # The ServerName directive sets the request scheme, hostname and port that # the server uses to identify itself. This is used when creating # redirection URLs. In the context of virtual hosts, the ServerName # specifies what hostname must appear in the request's Host: header to # match this virtual host. For the default virtual host (this file) this # value is not decisive as it is used as a last resort host regardless. # However, you must set it for any further virtual host explicitly. ServerName localhost ServerAdmin webmaster@localhost DocumentRoot /var/www/html <Directory /var/www/html> Order deny,allow Require all granted </Directory> </VirtualHost> # vim: syntax=apache ts=4 sw=4 sts=4 sr noet studiotv.conf file (available and enabled): <VirtualHost *:8180> ServerName studiotv.service.tebusco.lan ServerAdmin [email protected] DocumentRoot /var/www/studiotv <Directory /var/www/studiotv/> Options -Indexes +FollowSymLinks AllowOverride None Order deny,allow Allow from all Require all granted </Directory> # Available loglevels: trace8, ..., trace1, debug, info, notice, warn, # error, crit, alert, emerg. # It is also possible to configure the loglevel for particular # modules, e.g. #LogLevel info ssl:warn # No usamos ${APACHE_LOG_DIR} sino en su lugar /var/log/<host> ErrorLog /var/log/apache2/studiotv/error.log CustomLog /var/log/apache2/studiotv/access.log combined </VirtualHost> # vim: syntax=apache ts=4 sw=4 sts=4 sr noet However, when I hit the browser with http://studiotv.service.tebusco.lan, the default php page is shown instead. Question: What am I missing? (apache 2.4.7, nginx 1.6.0, ubuntu server 14.04).

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• Disable internal display on Macbook Pro without closed lid mode?

  - by jslaker

  I have an early 2007 Macbook Pro running 10.5 that I've recently set up on a KVM with my primary desktop system. The problem I've run into is that I have a 20" 1680x1050 LCD, and OS X only provides options to mirror at the resolution of the built-in display or to span. Since the built-in display runs at 1440x900, this leads to running my LCD at non-native res and a fuzzy picture. There isn't any option that I can find to simply disable the built-in display entirely and run the external LCD at its native resolution. I am aware of closed lid mode, but the MBP was disassembled while in storage for about 6 months (took it apart to pull the HDD) and the cable to the touchpad, which controls the sleep sensor was damaged, meaning closed lid mode won't work. I've looked into replacing the cable, but the cheapest I've been able to find it is $75-100, and I'm trying not to invest any more money into this computer as it also has a completely dead battery and a few other minor problems. I've found the app SwitchResX which appears to allow you to do what I need, but it has a lot of functionality I don't need and a ~$20 registration charge attached to it. An odd set of circumstances, I'm aware, but I was hoping somebody might know of an OS hack that would let me just disable the internal display and be done with it. :)

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• Servers/Websites Keep Going Down

  - by Tyler Johnson

  Okay, I'm a noobie. I know how to build and compose a website, but I have no idea what I'm doing when it comes to servers and server commands, etc. I've recently had a problem with all of my sites on our servers going down all at once and then I have to go in and reboot the server for them to come up again. At first this was annoying, but now it is becoming agonizing as it now takes 3-4 reboots for the websites to come back up. I contacted support for my hosting, but they are not being very helpful. They just keep telling me what the issue might be and basically telling me that I'm going to have to look into it and figure it out, which really isn't possible since I know nothing. Anyway, here are the things they said were possible reasons: They said I have "strange logs" in my Apache webserver log, error: sh: fetch: command not found. My php.ini memory limit is: 256M which is very high. It should be 32M or 64M. Server is reaching Max Clients, meaning we have more than 150 visitors at a time. (They supposedly "fixed" this, but the sites/server are still going down) I have some Wordpress sites with plugins getting errors like: PHP Warning: pack(): Type H: illegal hex digit G in... PHP Fatal error: Cannot use object of type stdClass as array in... PHP Fatal error: Maximum execution time of 30 seconds exceeded in... PHP Fatal error: Call to undefined function file_exists() in... PHP Parse error: syntax error, unexpected '<' I know that's a lot, but I really am at wits end and have no idea what to do now. If anyone could maybe give me some advice or point me in the right direction I would greatly appreciate it! Thanks! Oh, and here are the specs for my server: RAM: 2048MB CPU Shares: 40 Primary Disk: 50GB Data Transfer: 75GB Port Speed: 5Mbps Type: Linux

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• Magical moving desktop icons

  - by Nathan Taylor

  I have encountered a very strange behavior in Windows 7 that I cannot seem to identify and I have never seen or heard of on any system configuration. Whenever I move my mouse to the left-most edge of my primary display (centered in 3-display setup), my desktop icons magically move away from the cursor (up or down and to the right). It only happens when my desktop has focus and the mouse is positioned on the left, top or bottom edge of the main display. Moving the mouse all the way to the right edge of my right secondary display causes the mouse icons to snap back into their correct position. Ridiculous video of the issue My setup is 3 displays on two display adapters. The main display is running at 2560x1600, connected to the machine via a USB-powered DVI-D to DisplayPort adapter and is driven by an NVIDIA NVS 3100M video card. The secondary displays are running at 1440x900 and 1200x1920 and are driven by integrated Intel HD Graphics (mobile). It seems like some kind of panning behavior, but it's obviously not working as expected. I have updated all of my drivers, but no change. It's probably worth noting that the desktop icons are set to auto-arrange.

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• Ubuntu IP Configuration - multiple subnets & interfaces

  - by HaydnWVN

  Have a 'new' mailserver running postfix on Ubuntu. We are having some problems configuring the subnets & interfaces. Basically 2 subnets (.253. & .254.) need to be connected through the 3rd subnet (.252.) where the Router is residing. # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 10.62.254.199 netmask 255.255.0.0 network 10.62.254.0 broadcast 10.62.255.255 #gateway 10.62.252.138 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers 10.62.252.138 dns-search ***.com auto eth1 iface eth1 inet static address 10.62.253.199 netmask 255.255.0.0 network 10.62.253.0 broadcast 10.62.255.255 #gateway 10.62.252.138 #dns-nameservers 10.62.254.199 10.62.253.199 10.62.252.199 dns-nameservers 10.62.252.138 dns-search ***.com auto eth2 iface eth2 inet static address 10.62.252.199 netmask 255.255.0.0 network 10.62.252.0 broadcast 10.62.255.255 gateway 10.62.252.138 #dns-nameservers 10.62.254.199 10.62.253.199 10.62.252.199 dns-search ***.com I have an external support company who are looking into this (they built and configured this server), but it's taking far too long... So I'm looking to highlight the mistake!

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