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• hostname -f says "hostname: the specified hostname is invalid". Guess why?

  - by Ivan

  hostname -f says "hostname: the specified hostname is invalid". The hostname (FQDN) specified in /etc/hostname is also listed in /etc/hosts and is pingable. No actual DNS server yet of the host knows. Is this a reason of the error reported or something else? (the OS is Ubuntu 10.04 Server). Update: registering the host at a DNS server (so that the name can be successfully resolved via Internet) did not help.

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• Setting up Windows 2008 VPN Server

  - by Ivan Vovnenko

  Hi, i'm trying to setup windows 2008 server as a L2TP/IPSEC VPN server (PPTP is not secure), to receive windows (xp+) and Mac connections. The win2008 is behind the router. Can anyone provide easy step-by-step instructions? I tries several tutorial but no luck. Also VPN clients setup both on mac and windows would be very helpful. Thanks in advance.

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• Server not configured error

  - by Ivan Slaughter

  I'm using Plesk 8.3 for my hosting account. Server said : Server Default page If you see this page it means: 1. hosting for this domain is not configured or 2. there's no such domain registered in Plesk What you can do: * Using Plesk, you can create domains with web hosting on a single physical server. what left on my setting?

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• Is this hard disk dead?

  - by Korjavin Ivan

  Not sure, is this right site for this Q, but let me try Last time i have problem with hard disk. Sometimes its do strange sound, and i get it from logs: $dmesg | grep ata4 [29409.945516] ata4.00: exception Emask 0x10 SAct 0xf SErr 0x90202 action 0xe frozen [29409.945529] ata4.00: irq_stat 0x00400000, PHY RDY changed [29409.945538] ata4: SError: { RecovComm Persist PHYRdyChg 10B8B } [29409.945546] ata4.00: failed command: READ FPDMA QUEUED [29409.945562] ata4.00: cmd 60/30:00:56:22:5f/00:00:00:00:00/40 tag 0 ncq 24576 in [29409.945573] ata4.00: status: { DRDY } [29409.945580] ata4.00: failed command: READ FPDMA QUEUED [29409.945594] ata4.00: cmd 60/18:08:8e:22:5f/00:00:00:00:00/40 tag 1 ncq 12288 in [29409.945605] ata4.00: status: { DRDY } [29409.945611] ata4.00: failed command: READ FPDMA QUEUED [29409.945625] ata4.00: cmd 60/08:10:46:02:66/00:00:00:00:00/40 tag 2 ncq 4096 in [29409.945635] ata4.00: status: { DRDY } [29409.945641] ata4.00: failed command: READ FPDMA QUEUED [29409.945656] ata4.00: cmd 60/80:18:ee:04:66/00:00:00:00:00/40 tag 3 ncq 65536 in [29409.945666] ata4.00: status: { DRDY } [29409.945679] ata4: hard resetting link [29413.976083] ata4: softreset failed (device not ready) [29413.976097] ata4: applying SB600 PMP SRST workaround and retrying [29414.148070] ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [29414.184986] ata4.00: SB600 AHCI: limiting to 255 sectors per cmd [29414.243280] ata4.00: SB600 AHCI: limiting to 255 sectors per cmd [29414.243292] ata4.00: configured for UDMA/133 [29414.243324] ata4: EH complete [680674.804563] ata4: exception Emask 0x50 SAct 0x0 SErr 0x90a02 action 0xe frozen [680674.804575] ata4: irq_stat 0x00400000, PHY RDY changed [680674.804584] ata4: SError: { RecovComm Persist HostInt PHYRdyChg 10B8B } [680674.804603] ata4: hard resetting link [680678.840561] ata4: softreset failed (device not ready) Is this ata4 sata hard drive dead? Must i change it ASAP ? Need I specify more info?

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• Installing Windows 7 over PXE, preferably with domain autojoin

  - by Ivan Vucica

  At an educational non-profit, I've inherited a previously set-up Windows domain that, after the first reinstall of the machines, we ended up not using by simply not joining machines back into the domain. Over last summer, before the annual reinstall for shipping machines to the summer school, I toyed with the idea of installing Windows 7 over network, instead of just imaging the machines. It took a bit longer than I expected to figure out the basics; honestly, I expected that Windows would be more friendly for PXE installation out of the box. What I'm interested in is best practices for installing Windows 7 over PXE with domain autojoin. I'd love it if the whole setup could optionally be hosted on a UNIX based system as well. I've had some success by preparing an ISO using Windows Deployment Kit, and loading the ISO into memory. This was needed since I wanted a menu, and I think I couldn't get PXELINUX to chainload into Windows' bootloader. Unfortunately, I couldn't figure out much about customization of the Windows setup in that timeframe nor could I get Samba to work properly; studying the stuff ended up being too lengthy, especially the portion where I edited a disk image on Windows and copied it outside. WDK didn't make things easier by mounting the disk image into RAM, and writing it in its entirety when done with it, making me a very sad boy. I've recently found a different approach, too, that appears to be closer to Microsoft's original idea for netboot deployment and does not involve ISOs. So my question boils down to the following. What exact approach do you use for netbooting Windows 7 setup? How can Windows 7 setup be best customized to be completely unattended, including installation on specific system partition and not destroying the data partition, creation of passworded admin and default user, choice of MAC-address-based hostname, and joining a domain? As much details as possible for everyone's future reference would be appreciated. WDS isn't a bad choice, but if a Linux-based install can be used, that'd be better.

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• What can cause a kernel hang on redhat 4?

  - by Ivan Buttinoni

  I've to solve a nasty problem on a ten machine "cluster": randomly one of these machine hang during an hard computation, sometime still ping sometime not. The problem was described me at the phone, I've still no touch/see these machine, so I can't be more precise. It seem there's no (real) keyboard or monitor linked to them, so I haven't nothing about keyboard led or messages on monitor. Don't worry, what I really need is some suggestion where to search the problem, some suggestions on what can cause a kernel hang on a working machine. I also see this post, but seem same need on a different situation. My ideas since now: - HW problem (ram, cpu, fan etc.) - bad autofs configuration - bad nfs(?) configuration - presence of a trojan/hacker/etc - /dev/"swap" linked to /dev/zero - kernel out of memory(??) - kernel bugged In other words I try to imagine what kind of envent can occour that can crash the kernel insted of the application that generate the event. What hang have YOU experienced before? Write it to me! TIA

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• Can you plug-in the battery while laptop is on AC only?

  - by Ivan Petrushev

  Hello, I'm using my laptop at home with battery removed and only connected to the AC power. However I'm lacking the mobility as my power cord is kinda short. Is it safe from electrical point of view to plug in the battery while the laptop is connected to AC and disconnect the AC power afterwards? What about the opposite side of the question - is it safe (or what the damage could be) if you work on battery, plug in the AC and unplug the battery? If there are differents for different models of laptops, I'm asking about IBM Lenovo T60. Is there such thing as a 'hot-plug battery'?

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• Why is Midnight Commander crapped in SSH clients?

  - by Ivan

  Why does MC look like this in SSH clients (I've tried PuTTY and MindTerm) and how to fix it? On the server side is fresh installed 64-bit Ubuntu 10.04 Server. On the client side is XP SP3.

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• What's a good way for organizing PDF documents on windows?

  - by Ivan

  I'm looking for a good way to manage a lot of pdf documents (e.g. papers, ebooks) on windows. Ideally I'm looking for a windows version of the great mac app Yep. I've looked quite a bit and haven't found any windows app that provides and organized overview of your pdf documents. I've considered just tagging the pdf files, but there don't seem to be any apps to simply tag and search tagged files easily. I've found TaggedFrog, but the tags are kept in the app's internal DB and are associated with the filename. So if you move/rename a file it looses all its tags. In a nutshell: Is there a good windows app to organize/efficiently tag files?

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• Why does Midnight Commander look crap in SSH clients?

  - by Ivan

  Why does MC look like this in SSH clients (I've tried PuTTY and MindTerm) and how to fix it? On the server side is fresh installed 64-bit Ubuntu 10.04 Server. On the client side is XP SP3.

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• Why does a Windows 7 installation grow so seriously and how to shring it?

  - by Ivan

  I store all my data and the most of applications (those legally available in "portable" versions) on drive D: and only use drive C: for the Windows system and some heavily integrated applications like MS Office, Visual Studio, Adobe Reader, Flash Player etc. When I was using Windows XP, 50 GiB drive C: was more than enough. Now, as I've mitigated to Windows 7, it hardly is. Yesterday as I've checked, 7 GiBs were free on drive C:. Then I've installed fresh Windows updates (which were just some tens of MiBs to download) and checked again: now there are only 2 GiBs free. Where have 5 GiBs gone? PS: Don't be surprised my system installation takes actually that much: I've got Visual Studio and SQL Server with complete offline documentation library, but that doesn't explain where does free space disappear on simple Windows updates. PPS: I use an augmented CCleaner version to clean my PC every day, so there are for sure no temporary internet files of recycle bin trash files taking the place.

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• Sharing settings between a few virtual hosts in Apache

  - by Ivan Virabyan

  There are many virtual hosts in my apache configuration, each having quite a big amount of settings. The problem is that most of the virtual servers have the same settings. So config file is huge, full of identical virtual hosts, that differ only by ServerName directive. To change or add setting, I need to go through all of these vhosts. Is it possible to somehow share settings between virtual hosts, but still having few of them with their own ones? I hoped dynamic vhosts would be a good solution, but as I understand, it doesn't fit my problem, because there is no way to set specific settings for some of the vhosts. Furthermore I don't want my vhosts to be dynamic, because I have a fixed number of them. ServerAlias directive is also not a solution, because I need to know what url the user came from.

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• Dual HDD dual boot Win7/Win7 hibernate corrupts partitions?

  - by Ivan Zlatev

  I have two SSDs in my laptop. Both have 2 partitions each one with Windows 7 64bit and another one with OEM stuff on it (SYSTEM_DRV). I use the BIOS boot menu to boot between the drives. I have removed the drive letters so that no partitions of drive 1 are mapped in windows 2 on drive 2 and wise-versa. What I have observered however is that when I hibernate windows 1, boot windows 2 do some work and shutdown then resume windows 1 - the windows 2 partition will get corrupt quite often. Just happened actually - it is shown as "RAW" in the Disk manager instead of NTFS and windows will blue screen at boot. Alternatively I've seen cases where chkdsk will run and will wipe out all security descriptors making the partition completly unbootable. Why am I seeing these corruptions and what can I do to prevent them?

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• What may be the reason of "hide inactive icons" option of WinXP systray to stop working?

  - by Ivan

  Yesterday I've set up Defraggler (I've used it before many times) to defragment my hard drives and turn off my laptop when it finishes. I haven§t installed/uninstalled/reconfigured anything that day. When I've then turned the laptop on, I've got taskbar's "quick launch" area disappeared and all and every system tray (notification area) icons displayed (and the arrow-in-a-bubble usually folding to hide most of them gone). I've then successfully turned on "show quick launch" option, but "hide inactive icons" was already on. I've turned it off, applied, closed "taskbar and start menu properties", then opened again to turn the option back on, applied, restarted, nothing changes. Now I have to have all the system tray icons always displayed. Any ideas what may the reason be and how to fix? The OS is Windows XP Pro SP3 with all the updates.

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• virtualbox and nginx server_name

  - by Ivan

  I'm trying to configure gitlab running in an Ubuntu 12.04 guest with Windows7 host. I can ssh the guest using port-forwarding and access the nginx server using port redirection (8888 in host is 80 in guest, so localhost:8888 in host gets to the nginx server in the guest), but the server_name in nginx configuration file is giving me trouble. What is the correct listen and server_name that nginx would accept? The guest has the NAT interface at 10.0.2.15 and Host-Only interface at 192.168.56.101, static. Thanks!

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• How to make LibreOffice Calc to connect points in a holed series chart with lines?

  - by Ivan

  I've got a time series data table with one function (row) value available for every month and the second for every 3rd month (every quarter), having holes (empty cell values) for every 2nd and 1st months of a quarter. When I try to make a chart, I can only draw a bar or a point chart, but I want the actual data points to be interconnected with lines visually filling the gaps. How to achieve this in LibreOffice 3.6?

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• Computers on preexisting Windows 2008 domain accepting accounts from Samba3/4 domain

  - by Ivan Vucica

  I have a web application written in PHP where I would like to allow existing users to log into Windows computers, too. Re-hash of their passwords is doable (by requesting them to change the password). And to solve desync of passwords, I intend to have webapp authenticate users primarily against the domain. I don't want to give webapp users accounts on the existing domain, which we can call example.local. Instead, I want to provide them accounts on a new domain, let's call it webapp.example.local. From some research I have done, setting up a Samba4 domain and joining computers into this webapp.example.local domain would be one way to allow webapp users to log in. But, the computers should be members of the example.local domain. How can I get computers that are members of and are authenticating against Windows 2008-based example.local to also authenticate users against webapp.example.local? Magic keywords seem to be "trust relationship", "forest", etc, but at this point I haven't found a concrete example on how to establish this trust.

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• How to receive mail in Qmail?

  - by Ivan

  I've a server that uses Qmail. It is installed by default and it is supposed to work. I've created a new domain and new user (vadddomain + vadduser) without problems, but when I send an email from Gmail to [email protected] (the address I've created) it desappears, it is. But if connect to SMTP server directly (telnet domain.com 25) and post an email it arrives to the user queue. What's happening?!? Note: If I try to access to my user through telnet domain.com 110 it seems my pwd is not correct and it's the same I used when created the user with vadduser

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• What is the best filesystem for storing thousands of files in one dictionary-like id-blob structure?

  - by Ivan

  What filesystem best suits my needs? Thousands or even millions of files in one directory. Good (ext4 & ntfs level or close) reliability (incl. fault tolerance) and access speed. No directories actually needed, as well as descriptive names, just a dictionary-like structure of id-blob pairs is all I need. No links, attributes, and access control features needed. The purpose is a file storage where all the metadata (data describing all the facts about what the file actually contains and who can access it) is stored in a MySQL database. As far as I know common filesystems like NTFS and ext3/4 can go dead-slow if there are too many files placed in one directory - that's why I ask.

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• How to setup dhcp3-server to advertise the DNS server the server itself has got from DHCP?

  - by Ivan

  The Ubuntu 10.04 server has eth0 Internet interface configured by means of an ISP's DHCP. At the same time the server has static eth0 LAN interface to which it provides masquerading (NAT) and LAN-internal DHCP service (dhcp3-server). As far as I've understood the manual, I had to hardcode DNS servers to advertise through LAN DHCP with option domain-name-servers in dhcpd.conf. But what if the ISP changes his DNS server IP silently (we use a SOHO-class ISP, so this won't surprise me much)? Can I configure dhcpd to advertise the DNS server the server uses itself, the one gotten by its DHCP client mechanism?

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• How to run a program and get its PID in the background

  - by Ivan

  I have a Minecraft server startup script that looks like this: #!/bin/bash cd "$(dirname "$0")" exec java -Xmx4096M -Xms4096M -jar minecraft_server.jar How do I get java process's PID while being able to enter input into the Java process? if I change the exec line to exec java -Xmx4096M -Xms4096M -jar minecraft_server.jar & echo $! > pid it won't let me input any text into the Minecraft server java process.

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• Why is Midnight Commander look crap in SSH clients?

  - by Ivan

  Why does MC look like this in SSH clients (I've tried PuTTY and MindTerm) and how to fix it? On the server side is fresh installed 64-bit Ubuntu 10.04 Server. On the client side is XP SP3.

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• Can you link to a good MySQL dumper PHP script?

  - by Ivan

  I need to migrate a website to another host. I have only FTP server access and MySQL name+pass (the MySQL server's IP I was provided is 127.0.0.1, and there's neither PhpMyAdmin nor SSHell to use). A web app run there can access the DB using credentials I know and localhost server. So I'd need a PHP script, that will correctly dump all the available databases of the MySQL server so that they can be imported on the new server. Can you recommend a good one?

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• What can be a reason for phpMyAdmin login to be not working (not at all, no reaction on submit)?

  - by Ivan

  When I open "http://localhost/phpmyadmin/", enter "root" as the user name and my MySQL root password and press go, then if I was using Firefox, I was getting offered to download index.php file (of a zero length), if I was using Opera 11, it said "Connection closed by remote server". Following recommendations I've removed all packages related to phpMyAdmin, PHP, MySQL and Apache and then reinstalled them step-by step (instead of just issuing apt-get install phpmyadmin and relying on the system to install the whole LAMP stack via dependencies as I've done before). The only change I've got was Firefox to stop offering to download index.php - now when I press Ok to submit my password, it just doesn't show any visible reaction at all. What may the reason be and how to fix it? I use up-to-date Xubuntu 11.04. Reinstalling the whole LAMP stack and phpMyAdmin did not help, neither did removing AppArmor. I've tried to use SQLBuddy instead, but there's exactly the same problem. So, I think, the problem is not in phpMyAdmin but in MySQL, Apache or something. MySQL seems to work if I use command line to access it. Apache & PHP seems to work also, as the login page of phpMyAdmin displays correctly.

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• How to limit my CPU power programmatically on Windows 7?

  - by Ivan

  Whenever I run a CPU-heavy activity (like compressing a big set of files into an archive for example) my CPU switches to its full throttle (maximum frequency) and shuts down of overheat in less than a minute. Instead, I would like it to keep slowed-down slightly to do the task a bit slower but be able to reach the finish. At the same time I don't want to dim my screen brightness or adjust anything else what standard Windows power-saving system does. So how do I actually set a cap to limit my CPU power? The CPU is Core 2 Duo T7250, the OS is Windows 7 32-bit, there seem to be no BIOS settings or jumpers available to configure the frequencies.

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