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• Cannot connect to Xen domU via VNC if X isn't installed on domU

  - by Hai Minh Nguyen

  I'm trying to build a Xen domU that can be connected through the Xen's VNC server. Below is the template (actually it's generated by OpenNebula): name = 'one-153' #O CPU_CREDITS = 256 memory = '128' bootloader = "/usr/bin/pygrub" disk = ['tap:aio:/home/oneadmin/cloud/one/var/153/images/disk.0,xvda,w',] vif = ['mac=02:00:c0:a8:00:03,bridge=virbr0',] vfb = ['type=vnc,vnclisten=slave1,vncdisplay=1,vncpasswd=v98KXdFN'] The problem is that I can't connect to the domU if it doesn't have X. In this case all I got is a blank screen. Besides, if the domU has X, the screen is still blank until the login prompt appears, while it should be like this. Some information that may be useful: The domU and the dom0 both run CentOS 5.5. If the domU has X, it can be connected even when both X and the domU's VNC server isn't running. The VNC client is RealVNC.

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• Restore using time machine from an macbook to an macbook pro (first intel)

  - by Anders Nørgaard

  Hello.. My girlfriend have Macbook 10.6.3, the first plastic version. the screen broke an its at service store now. In the mean time, i have tried to restore from hers TM backup to my old macbook pro 10.6.3 (the first intel version). Everything seems to work out fine, but when its finish, it says reboot, but nothing happens. When i hold down the power button, powering down, and starts again, its come up with the grey roll down screen "you need to restart your machine again" in different languages. I have tried the restore procedure over again 2 times, and every time it ends up like this... Anyone have a suggestion what to do ? Thanks - Anders.

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• how to multi-boot/upgrade linux from LVM-based partition

  - by kenny-bobby

  i currently have FC3 linux which installed itself on the hard disk using LVM partitioning, so it is basically all one big partition. i would like to try some other distributions and upgrade to something newer, but don't want to lose my current capabilities and data files, and i know nothing or less about LVM. Is it possible (and if so an example would be nice) to install a non-LVM-based distribution on the LVM disk and have multi-boot options? Or do i have to start over new and drop the LVM? My guess is that i should save my /home (data files and .rc files) on a backup device first, then somewhere/somehow create a new partion for installing another distribution. Any LVM experts out there that have tried anything like this--well i sure could use some pointers and advice...

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• Pidgin getting "Connection Refused" whenever I connect to IRC server

  - by tvanover

  On my win 7 x64 machine using pidgin 2.6.3 I cannot connect to any IRC server. I have tried most of the North American servers, as well as my workplace's internal server with no luck. I have tried from work as well as from home but different networks have no effect. I keep getting Unable to Connect: Connection refused. It work fine 3 weeks ago on this very machine running Win 7 x64. But then I re-imaged, and did not backup my .purple folder. Which I had used for the past 2 years and originally created on a vista install. I can connect using this install of Pigin to yahoo and msn with no problems. Just not to irc. Any thoughts?

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• Windows wait command till a system time

  - by user53864

  I have made a batch script for backup recently. Somewhere in the middle of script I'll have to wait for some time to be reached and then resume the next line of the script. I've scheduled the script at 4:00PM and after the wait command the next line should start at exactly 5:30PM. I thought of using SLEEP command but it's not sure that the commands used before the wait command will end up at certain time(due to inconsistent file sizes) but it's sure that they will be done by 5:00 or 5:10 and next it should execute wait command which waits for certain system clock. I'm checking if there is any command that waits or sleeps until the time specified reaches the system time and resumes there after. Anybody came across this situation and how was that resolved?

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• RAID 0 performance gains?

  - by NickAldwin

  I'm building a new computer over the summer. I'm fairly competent in computer hardware, and am thus building the computer from scratch. I have everything planned out, but I was wondering about RAID. I asked which RAID I should use earlier, but now that it's pretty clear that RAID 1 isn't really that great, I think I'll go with cloud-backup instead of disk-redundancy. However, I still face a choice: use two 1TB drives as two 1TB drives, or combine them into a RAID 0 striped array. Is there any performance gain at all? I know that if one drive dies, everything is gone, so is the performance gain worth it? I'm building a pretty advanced computer, with SLI video cards and a fast CPU, so I'm thinking RAID 0 would give me some good hard drive performance. From your experience, is RAID 0 viable?

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• Deactivate dead OCS 2007 R2 Edge Server?

  - by slashp

  I'm having a surprising issue where our old OCS 2007 R2 Edge server died of hardware failure (no backup) in the middle of our move to Lync. How can I forcefully remove the Edge server from the organization without being able to deactivate the role from the server itself? I've noticed the correct procedure for uninstalling OCS 2007 R2 is as follows: If you are removing an Edge Server, a Mediation Server, an Archiving Server, or a Monitoring Server, remove the Office Communications Server 2007 R2 components in the following sequence: Microsoft Office Communications Server 2007 R2 Edge Server Microsoft Office Communications Server 2007 R2 Mediation Server Microsoft Office Communications Server 2007 R2 Archiving Server Microsoft Office Communications Server 2007 R2 Monitoring Server Microsoft Office Communications Server 2007 R2 Core Components Microsoft Office Communications Server 2007 R2 Unified Communications Managed API 2.0 Core Redistribution package And to deactivate an Edge server: http://technet.microsoft.com/en-us/library/dd572832(v=office.13).aspx Any advice would be greatly appreciated.

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• Why PC reboots when there’s a power failure even with UPS?

  - by Jamil

  I've purchased a Line Interactive UPS 1200VA. It's supposed to give 8~20min backup (as written in the manual). This UPS has transfer time < 10ms. It works fine when the mains is active. But the problem is that when the power went off, the PC also went off for a fraction of a second and started rebooting. The strangest thing though is that it has to be a proper power failure by the service supplier. If I just turn off the power at the wall plug, the UPS kicks in immediately and the PC carries on working fine. What's the solution of that? What should I do? My hard drive was physically damaged because of improper shut down & restart. I've 5~8 times power outage in my country so I badly need an UPS.

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• automysqlbackup not working weirdly on shared host

  - by KPL

  I'm on HostGator and I have not-root-level SSH access. I manually setup automysqlbackup in a /home/user/automysqlbackup folder. Created a file called runbackup in the same folder, chmod +x'ed it. The content : /home/user/automysqlbackup/automysqlbackup /home/user/automysqlbackup/myserver.conf Now, when I run ./runbackup from shell, no email is sent. I've setup a daily cron job. The crontab line reads - 24 06 * * * /home/user/automysqlbackup/runbackup When the crontab is run, I do get an email, but, the subject is WARNING: Error Reported - MySQL Backup Log and SQL Files for localhost - 012-03-19_06h24m The email does have an attachment, but it just has the SQL for creating tables. No data in the several rows at all. I don't know what wrong I'm doing and this is freaking me out! I tried writing a custom script as well, using this guide, but mutt doesn't send email, then. The OS used by HostGator is CentOS.

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• PostgreSQL 9.1 Database Replication Between Two Production Environments with Load Balancer

  - by littleK

  I'm investigating different solutions for database replication between two PostgreSQL 9.1 databases. The setup will include two production servers on the cloud (Amazon EC2 X-Large Instances), with an elastic load balancer. What is the typical database implementation for for this type of setup? A master-master replication (with Bucardo or rubyrep)? Or perhaps use only one shared database between the two environments, with a shared disk failover? I've been getting some ideas from http://www.postgresql.org/docs/9.0/static/different-replication-solutions.html. Since I don't have a lot of experience in database replication, I figured I would ask the experts. What would you recommend for the described setup?

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• Command line DVD to ISO ripper

  - by RandomInsano

  I have an old XBOX with XBMC installed and I want to rip my dvd collection to my home server as ISO files so that I can watch them over the network. My server is headless (no monitor), so I need the software to run on Solaris, Linux or OpenBSD without X11 running. Does such a magical tool exist? I've seen vobcopy, but does that only work on VOBs? Since XBMC supports DVD menus and everything as though it was a straight disc, I'd rather have my backup work exactly as it does without needing my DVD.

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• Restored Domain Controller does not display any information using dcdiag command

  - by dasko

  I am testing restoring a domain controller from system state backup to different hardware in a non production environment as a sanity check for our restoration procedure. When i run the dcdiag command I get "blank info back" and all that is displayed are two lines as follows: Domain Controller Diagnosis Performing initial setup: and then I am returned to the command prompt. Even when I do dcdiag /v i get the same result. I have double checked the DNS settings and Active Directory works properly. All FSMO roles are being held by this restored Domain Controller. I am able to join test pc's to the domain without issue etc Is this a common issue or is there something that I am missing. Thanks.

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• How do you persuade users to abandon their personal folders?

  - by thing2k

  Towards the end of last year we started using Mimecast services, in particular their cloud base e-mail archiving. Since then we’ve been rolling out the Mimecast Services for Outlook (MSO) Add-in. We’ve informed the users that we will be give them training in the next few Months, and we do not require them to use it, but my boss stated that we are getting rid of Personal Folders (pst files), by putting them into Mimecast. Unsurprisingly this did cause something of a backlash. Though really who likes change. I know the IT reasons for getting rid of Personal Folders (inefficient, unreliable, single access, etc), but from an average user’s perspective, unless they have had one fail on them, they see them as simple and only way to archive e-mail when their 200Mb mailbox is full. So what can I say to the users, to get them to understand why Personal Folders are not the best solution?

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• Linux Virtualization Options on EC2

  - by recampbell

  I need to subdivide EC2 (or perhaps other cloud provider) instances. I know you cannot run a full virtualization stack on another. For instance a Xen guest cannot host a VirtualBox guest. So this means I am left with operating system-level virtualization. EC2 kernels are only publishable by select vendors, so you cannot upload the custom kernels required for OpenVZ or Vserver. For Linux, I think this leaves me with lxc (on Ubuntu 9.10), User Mode Linux, or qemu. I'm having a hard time finding comparisons between them. Performance is a concern, as is the ability to provide SMP to the guests. I would also like to use COW/sparse roots to reduce guest provisioning. My question is, what are the trade-offs between these options?

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• Files Corrupted on System Restore

  - by Yar

  I restored my OSX today by copying the system over from a backup. Most things seem to be working, but every single GIT repo gives pretty much the same error fatal: object 03b45161eb27228914e690e032ca8009358e9588 is corrupted I have tried chowning, doing everything as sudo or root... I have no idea what to try next. This would be a normal git question except that it's on many repos. Ideas? Note: I'm using git 1.7.0.3 and I was probably using 1.7.0 before. Edit: Tried with 1.7.0.2 and it made no difference. Edit: Even when copying any of the repos I get this strange message cp: .git/objects/fe/86b676974a44aa7f128a55bf27670f4a1073ca: could not copy extended attributes to /eraseme/Pickers/.git/objects/fe/86b676974a44aa7f128a55bf27670f4a1073ca: Operation not permitted

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• how to program a special key on my laptop?

  - by daniel11

  ok so i have a set of touch screen buttons on the top of my laptop's keyboard, (one turns on power save mode, one disables/enables the mouse touch pad, one toggles the wifi adapter, and two turns the volume up/down) however theres another one that opened a file backup utility that came with my laptop. but since i bought my laptop , ive uninstalled that utility, rendering this button useless. So i was wondering if it was possible to reprogram that button to open another file or program on my computer? And if so what are the requirements and how would i go about doing it? Thanks in advance!

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• Configure Postfix to send emails "via" a server [migrated]

  - by Zach Russell

  This is a question related to postfix and WordPress (but is more of a postfix question). To give some background, on a professional WordPress host (like WP Engine) when I receive WordPress Mail Notifications (comments, form submissions, new users, etc...) it will say in gmail sent from "predefined wordpress admin email" via email.wpengine.com. This is not blocked by Google's spam filters or anything. I have a cloud server set up and a WordPress site installed on it. When I send email from [email protected] it gets sent to spam and when I send email as [email protected] (me) it fails to send completely. This does, however send fine on WordPress. This goal of this it so send all emails via mail.wptemple.com and have them not get caught by spam filters. How can I accomplish this?

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• Crontab script on Mac OS X Lion does not work anymore

  - by Nopster

  I have a problem with cron tasks. Previously this script worked fine on Mac OS X 10.6 server, but when I initialize it on Lion (client), this script stopped working. Basically, this .bat file calls a jar file (that invokes a loop of mysqldump commands) to backup several databases on several servers, and runs perfectly if launched by the shell. cd /Users/nameoftheuser/Desktop/backupper /usr/bin/java -cp .:Backupper.jar:lib/mail.jar backupper.Main "/Users/nameoftheuser/Desktop/backupper/listasiti.txt" "/Users/nameofthe/Desktop/backupper/config.properties But if the cron launches the same .bat file, the generated database backups are 0 bytes. The cron entry is: 0 0 sh /Users/path/to/file.bat I believe that the problem is that cron doesn't run as root. Or what else?

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• nTop RRD file architecture

  - by Seanny123

  I have a gig of nTop RRD files and I would like to start graphing them with rrdtool (but not with nTop, since I'm hoping to do this with a separate backup of the database as workaround to the impossibility of limiting the RRD files by size), but I don't know how the files are structured. I've tried reading the RRD documentation from SourceForge and the nTop FAQ, but I'm not finding the information I need. Does anyone know of any documentation I should be looking at or how the files are structured? Here https://dl.dropbox.com/u/669437/file%20structure.png is a screenshot of the file structure. At first I thought it was organized by IP address (so the rrd files for address 1.1.2.3 would be stored in folder 1-1-2-3 or even the reverse order), but that doesn't seem to be the case. It isn't organized by MAC address either, although some hosts are saved that way. Any help would be appreciated.

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• What proportion of DBA skills are platform-independent?

  - by Arkaaito

  Problem: we've grown to the point where we need a real DBA. Real DBAs are hard to find. Possible solution: I know someone with extensive experience (currently working on MSSQL) who is looking for a new DBA job. He might be willing to consider working for a MySQL shop (I haven't asked). Snag: I don't know to what extent MSSQL DBA skills map to MySQL DBA skills. I'm a developer, so I know enough about MySQL to develop apps which use it (including the basic performance-tuning, index selection, etc.), do schema design, and perform simple utility tasks (backup with mysqldump, scripting, etc.). I don't know anything about MSSQL. Nor do I actually know much about the boundaries of the DBA role. Can anyone with more experience - perhaps as a DBA - weigh in on this? Are there enough similarities between MSSQL and MySQL that it's worth asking a MSSQL DBA if he'd be interested in applying for a MySQL position?

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• Build a RAID-5 USB Array or NAS?

  - by TK Kocheran

  I'm looking to build a RAID-5 or RAID-6 hard disk array to be used as a centralized backup location for my home network. I have a lot of 4-8GB DVD ISO files which I intend to serve over the network to my TV using DLNA or something similar. I need decent write times, fast read times, and preferably a way to connect this array to my network router over USB. I'll probably be using ext3/4 on it (I'd use btrfs if my router supported it :-[). Is there a way to build a RAID array that is accessible over USB? I'm kind of new to this and most guides assume you're running a RAID array inside your machine. I need at least 5TB of space, and I need redundancy, so I prefer RAID-6. How can I go about accomplishing this?

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• Installing an EC2 (EBS based) instance on another AWS account

  - by imaginative

  We're moving from one AWS account to another. I have a couple of EC2 instances I would like to move over. These instances are EBS based. Googling around, I'm seeing all sorts of convoluted answers for how to appropriately launch this EBS based instance on a new account. Surely there has to be a simple way of going about this. As of right now, what I have done so far is backup the EB2 Volume as a snapshot. I then altered the permissions of the snapshot to allow the new AWS account number to be able to access it. I am not sure where to go from here. Do I have to create an image from the EBS snapshot? Upload it to S3? What's the next step(s)?

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• Recovering/Rebuilding MySQL .FRM, .MY* files from IBDATA1

  - by Synetech

  I recently had an incident in which several MySQL files were wiped out (mostly from WordPress, but also a few of MySQL’s own files). The IBDATA1 file is unaffected, but several .frm are gone as are a few .myi and .myd files. So now I need to find out if there is a way to rebuild the missing files from IBDATA1. I tried Googling it, assuming that such an issue has come up before, and indeed there were numerous search results (including this question), but all of the ones I looked at were the opposite, about recovering from .frm and .my* files or somehow required these files. Is there a way to rebuild these files? I know I have a relatively recent backup (a .SQL file) if there isn’t, but I’m hoping that these are the kind of files that are rebuilt if missing or outdated.

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• Lots of mysql Sleep processes

  - by user259284

  Hello, I am still having trouble with my mysql server. It seems that since i optimize it, the tables were growing and now sometimes is very slow again. I have no idea of how to optimize more. mySQL server has 48GB of RAM and mysqld is using about 8, most of the tables are innoDB. Site has about 2000 users online. I also run explain on every query and every one of them is indexed. mySQL processes: http://www.pik.ba/mysqlStanje.php my.cnf: # The MySQL database server configuration file. # # You can copy this to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" to set user-specific options. # # One can use all long options that the program supports. # Run program with --help to get a list of available options and with # --print-defaults to see which it would actually understand and use. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # This will be passed to all mysql clients # It has been reported that passwords should be enclosed with ticks/quotes # escpecially if they contain "#" chars... # Remember to edit /etc/mysql/debian.cnf when changing the socket location. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram # This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] # # * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp language = /usr/share/mysql/english skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 10.100.27.30 # # * Fine Tuning # key_buffer = 64M key_buffer_size = 512M max_allowed_packet = 16M thread_stack = 128K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP max_connections = 1000 table_cache = 1000 join_buffer_size = 2M tmp_table_size = 2G max_heap_table_size = 2G innodb_buffer_pool_size = 3G innodb_additional_mem_pool_size = 128M innodb_log_file_size = 100M log-slow-queries = /var/log/mysql/slow.log sort_buffer_size = 5M net_buffer_length = 5M read_buffer_size = 2M read_rnd_buffer_size = 12M thread_concurrency = 10 ft_min_word_len = 3 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 512M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. #log = /var/log/mysql/mysql.log # # Error logging goes to syslog. This is a Debian improvement :) # # Here you can see queries with especially long duration #log_slow_queries = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * BerkeleyDB # # Using BerkeleyDB is now discouraged as its support will cease in 5.1.12. skip-bdb # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # You might want to disable InnoDB to shrink the mysqld process by circa 100MB. #skip-innodb # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI "tinyca". # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] #no-auto-rehash # faster start of mysql but no tab completition [isamchk] key_buffer = 16M # # * NDB Cluster # # See /usr/share/doc/mysql-server-*/README.Debian for more information. # # The following configuration is read by the NDB Data Nodes (ndbd processes) # not from the NDB Management Nodes (ndb_mgmd processes). # # [MYSQL_CLUSTER] # ndb-connectstring=127.0.0.1 # # * IMPORTANT: Additional settings that can override those from this file! # The files must end with '.cnf', otherwise they'll be ignored. # !includedir /etc/mysql/conf.d/

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• Choosing a very basic Linux distro with minimal boot time?

  - by user30961

  I've had Ubuntu for a year now, like it but it doesn't match my needed configuration for my old laptop. So... I am using Linux mainly for webapps so I don't care much about user interface. What I need is a distro which is small enough to install on a SD memory card (or USB) since I am removing the hard drive, all my data is in the cloud. I also want it to have as short boot time as possible. I tried Puppy Linux and it seems ok but it had preinstalled looots af small apps I don't need, I would really like to have a distro with minimal preinstallations and add them on my own. So what are my choices and why would you recommend these?

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