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• Determining which database instance makes biggest IO

  - by user2008937

  Assuming that I have a dedicated server on which I am running multiple instances of mysql and postresql servers. How without iotop determine which instance in particular time (proc/pid/io shows data collected in some peroid of time) makes the biggest IO (so it increases IOWAIT)? When lots of ppl do something on DB then I clearly see which instance is making the load because of high cpu usage, but I had a situation when the cpu usage was just normal, but very high iowait made a huge load on server and i had problem finding process that was making some outstanding IO

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• How Do I Automatically Update My Database Nightly

  - by Russ

  Currently, every day before I start work, I complete the following procedure: ssh to the production server gzip our daily database dump file scp the gzipped dump file over to my computer gunzip the dump file dropdb mydatabase createdb mydatabase psql mydatabase < dump.sql Is it possible (I'm sure it is) to automate this process on Mac OSX? This way it is done by the time I get to work in the morning. If so, what is the quickest and easiest way

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• How Do I Automatically Update My Database Nightly

  - by Russ

  Currently, every day before I start work, I complete the following procedure: ssh to the production server gzip our daily database dump file scp the gzipped dump file over to my computer gunzip the dump file dropdb mydatabase createdb mydatabase psql mydatabase < dump.sql Is it possible (I'm sure it is) to automate this process on Mac OSX? This way it is done by the time I get to work in the morning. If so, what is the quickest and easiest way?

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• Server Load Check

  - by ntechi

  Is it possible to trace which file or process or database query is effecting the load on a VPS? I am using Centos with 512 MB Guarantee Memory and 1 GB burst Memory, I am running 3 wordpress sites from it, where all are having daily traffic of 30-100 visitors each, After every 2-3 days I need to restart my VPS because the resources are taking high usage of memory, I tried running top command and it shows Apache as high, But is it possible to check which website is taking load? Here is my 'top -c' command output results

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• Innotop and Monit to kill thread using too much resources

  - by pocesar

  Instead of restarting the whole MYSQL process, sometimes I just want to kill the offending thread instead of making everything go down. Usually the spike in CPU is when a bot is crawling the first pages of pagination of my site (over 70.000 paginated results, 45 items per page). Is there a way I could do this automatically using monit and innotop? I couldn't find relevant information on Google, that's why I'm asking here. If these two tools aren't par to the task, which ones should I use?

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• How much does HDD cache matter with Linux softraid?

  - by Jawa

  I'm in a process of renewing/expanding my disk sets, but not quite sure what kind of disks to get, cache-wise. What difference does disk cache amount of 16/32/64MB do, in capacities of, say, 1/1.5/2TB SATA disks? The disks will be used in a webapp server and in a media workstation, with Linux's softraid in raid-1/raid-5 configurations. Note, that as both purposes are purely for a hobby, the pricetag for a dozen of disks is a big issue.

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• Make Excel 2007 open hyperlinks in Firefox

  - by skypecakes

  In Excel 2007, when I click a hyperlink, it opens in IE. I'm running XP Professional SP3. Firefox is set as my default browser. Links in Word and Outlook open in Firefox. But Excel opens them in IE. Anyone know how to fix it? Edit: Process Explorer shows the command line for IE to be "C:\Program Files\Internet Explorer\IEXPLORE.EXE" -Embedding Thanks!

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• Will terminal keep executing a command after i disconnect my VNC session?

  - by Fer

  I established a remote session in a MacOSX (10.6.8) from my PC (Windows7) using VNC. I initiated terminal and it is currently executing a task that will take probably 1 day before completing. Should I expect that even if I disconnect the VNC session, Terminal will keep running after I disconnect? I assume so since I used VNC just to remotely start the process but want to double check. Can anybody tell me if I am wrong?

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• Ubuntu 10.04 live cd keyboard problem.

  - by Octa

  Today I downloaded the Ubuntu 10.04 x64 .iso but when trying it out in live cd the keyboard of both my laptop and a microsoft branded one didn't work. I was planning into installing Ubuntu in a partition but I couldn't even put my info in the installation process to do it. Is this a problem with the .iso or the driver? because I'm afraid that if I can actually go ahead with the installation then the keyboard won't work after that too.

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• Apache - suExec - FastCGI - PHP = seciruty issue

  - by Jari V.

  I installed Apache with FastCGI (mod_fastcgi), suExec and PHP on my local development box. Working perfectly, expecting one thing. Let's say I have two users: user1 - /home/user1/public_html user2 - /home/user2/public_html I discovered a serious security hole in my configuration: I can include a file from user2 web root in user1 file. How to prevent? Any tips? php-cgi process is running under correct user.

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• Win-XP Browsers Hang on page load - (waiting for...)

  - by CHarmon

  Hello, I’m having problems with my browsers hanging on loading pages on my desktop machine. I’m using Windows XP Pro with SP3 and fully updated except for IE 8. All three of my browsers, IE 7, Chrome and Firefox are having the same problems. Pages are not being loaded and are hanging on “waiting for …”. The browsers are waiting for the page being loaded or ad servers. Sometimes a page will load but the loading graphic continues to be displayed as if the page were still loading when the page appears to be fully loaded. The problem is bad enough that I can’t really use any of my browsers. I can eventually get most pages to load by stopping and restarting the page load. I have DSL modem with a wireless router and I have been able to eliminate the modem and router from being the source of my problem. My laptop doesn’t have any problems even when hardwired to the router and with the wireless connection disabled. I deleted the NIC and let XP re-install. Also tried a different network cable. Tried the same router port used in the laptop test. One clue that may be important is that I can’t connect to my router using the desktop machine…the page hangs while trying to connect. I can ping the router and I can quickly connect to the router using the laptop. I also can’t use the Windows update process – the page never fully loads. The problem affects other user accounts and even happens in safe mode. I am convinced the problem is with part of the O/S…some layer able to affect all of the browsers. The purpose of this post is to see if anyone has some ideas before I do a XP repair. I have done quite a bit of trouble-shooting: Ran a full anti-virus scan with AVG – no problems. Ran full scans with Spybot, MalwareBytes and Sophos anti-rootkit – no problems. Ran Chkdsk with both options checked. Ran Disk Clean up Defragged RE-installed IE7 Cleared all the browser caches Ran Ccleaner (registry tool) Ran HijackThis – nothing unusual (problem happens in safe mode too) Ran Process Explorer – no unusual processes Used System Restore and fell back several days – no change in the problem Booted to last known good configuration – no change in the problem Ran MicrosoftFixit50199.msi – no change in the problem Any ideas or suggestions would be appreciated…I’m not looking forward to doing a repair on XP. Thanks in advance for any help.

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• Different PATH environment variable for 32bit and 64bit Windows - is it possible?

  - by Piotr Dobrogost

  Is it possible to have whole or part of PATH environment variable specific to the type of running process's image (32bit/64bit)? When I run some app from within 64bit cmd.exe I would like to have it pick the 64bit version of OpenSSL library whereas when I run some app from within 32bit cmd.exe I would like to have it pick the 32bit version of OpenSSL library. FOLLOW UP where.exe does not find OpenSSL libs when %ProgramFiles% variable is used in the PATH environment variable

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• Explorer is missing half tray icons in XP

  - by Ither

  Hi, lately and with no explanation half of the tray icons disappear every time I start up XP SP3. I use Process Explorer (procexp.exe) to look for the missing processes and they still there. When i kill and restart explorer.exe, the tray is complete again. I don't know how to diagnostic or repair the problem. Any suggestions? Thanks in advance.

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• ZFS Recover from Faulted Pool State

  - by nickv2002

  I have a six disk ZFS raidz1 pool and had a recent failure requiring a disk replacement. No problem normally, but this time my server hardware died before I could do the replacement (but after and unrelated to the drive failure as far as I can tell). I was able to get another machine from a friend to rebuild the system, but in the process of moving my drives over I had to swap their cables around a bunch until I got the right configuration where the remaining 5 good disks were seen as online. This process seems to have generated some checksum errors for the pool/raidz. I have the 5 remaining drives set up now and a good drive installed and ready to take the place of the drive that died. However, since my pool state is FAULTED I'm unable to do the replacement. root@zfs:~# zpool replace tank 1298243857915644462 /dev/sdb cannot open 'tank': pool is unavailable Is there any way to recover from this error? I would think that having 5 of the 6 drives online would be enough to rebuild the right data, but that doesn't seem to be enough now. Here's the status log of my pool: root@zfs:~# zpool status tank pool: tank state: FAULTED status: One or more devices could not be used because the label is missing or invalid. There are insufficient replicas for the pool to continue functioning. action: Destroy and re-create the pool from a backup source. see: http://zfsonlinux.org/msg/ZFS-8000-5E scan: none requested config: NAME STATE READ WRITE CKSUM tank FAULTED 0 0 1 corrupted data raidz1-0 ONLINE 0 0 8 sdd ONLINE 0 0 0 sdf ONLINE 0 0 0 sdh ONLINE 0 0 0 1298243857915644462 UNAVAIL 0 0 0 was /dev/sdb1 sde ONLINE 0 0 0 sdg ONLINE 0 0 0 Update (10/31): I tried to export and re-import the array a few times over the past week and wasn't successful. First I tried: zpool import -f -R /tank -N -o readonly=on -F tank That produced this error immediately: cannot import 'tank': I/O error Destroy and re-create the pool from a backup source. I added the '-X' option to the above command to try to make it check the transaction log. I let that run for about 48 hours before giving up because it had completely locked up my machine (I was unable to log in locally or via the network). Now I'm trying a simple zpool import tank command and that seems to run for a while with no output. I'll leave it running overnight to see if it outputs anything.

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• how do I make two internal networks speak with one another

  - by Nick M.

  I have two internal networks that are connected to each other 10.10.10.1 and 10.10.11.1 I am trying to make devices on the 10.10.10.1 network be able to access the devices on the 10.10.11.1 network and vice versa. My questions is what is the networking term used to "bridge/route" traffic between the two networks making each other available to one another. Also what is the process in getting this going using iptables?

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• Best way to segment traffic, Vlan or subnet

  - by thebird

  We have a medium sized network of around 200 nodes and are currently in the process of replacing old daisy chained switches with stack-able or chassis style switches. Right now our network is broken up via subnet; production, management, IP, etc each on a separate subnet. Does anyone have an opinion on whether creating Vlan's instead of subnets would be more beneficial? Our general goal is to prevent bottlenecks, separate traffic for security, and to manage traffic with more ease.

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• Remote deployment of OS X Mountain Lion 10.8 upgrade, not as a fresh install

  - by Dean A. Vassallo

  Anyone have any ideas or suggestions (or know if its even possible) to remote upgrade a fleet of Macs from 10.6.8 to 10.8 remotely. I presume I can push the installESD through ARD, but I want it to run completely unattended. If it is not possible through "traditional" methods does anyone know of any tools that might help automate this process? Thank you for your thoughts, feedback, and suggestions.

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• High CPU usage - symptoms moving from server to server after bouncing

  - by grt3kl

  First off, I apologize if I didn't include enough information to properly troubleshoot this issue. This sort of thing isn't my specialty, so it is a learning process. If there's something I need to provide, please let me know and I'll be happy to do what I can. The images associated with my question are at the bottom of this post. We are dealing with a clustered environment of four WebLogic 9.2 Java application servers. The cluster utilizes a round-robin load algorithm. Other details include: Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04) BEA JRockit(R) (build R27.4.0-90_CR352234-91983-1.5.0_12-20071115-1605-linux-x86_64, compiled mode) Basically, I started looking at the servers' performance because our customers are seeing lots of lag at various times of the day. Our servers should easily handle the loads they are given, so it's not clear what's going on. Using HP Performance Manager, I generated some graphs that indicate that the CPU usage is completely out of whack. It seems that, at any given point, one or more of the servers has a CPU utilization of over 50%. I know this isn't particularly high, but I would say it is a red flag based on the CPU utilization of the other servers in the WebLogic cluster. Interesting things to note: The high CPU utilization was occurring only on server02 for several weeks. The server crashed (extremely rare; we are not sure if it's related to this) and upon starting it back up, the CPU utilization was normal on all 4 servers. We restarted all 4 managed servers and the application server (on server01) yesterday, on 2/28. As you can see, server03 and server04 picked up the behavior that was seen on server02 before. The CPU utilization is a Java process owned by the application user (appown). The number of transactions is consistent across all servers. It doesn't seem like any one server is actually handling more than another. If anyone has any ideas or can at least point me in the right direction, that would be great. Again, please let me know if there is any additional information I should post. Thanks!

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• postfix error fatal:table lookup

  - by samer na

  here the mail.log server localhost: Can't connect to local MySQL server through socket '/var/run/mysqld /mysqld.sock' (2) Mar 23 23:07:19 ubuntu postfix/trivial-rewrite[6417]: fatal: mysql:/etc/postfix/mysql_virtual_alias_maps.cf(0,lock|fold_fix): table lookup problem Mar 23 23:07:20 ubuntu postfix/smtpd[6401]: warning: problem talking to service rewrite: Success Mar 23 23:07:20 ubuntu postfix/cleanup[6296]: warning: problem talking to service rewrite: Connection reset by peer Mar 23 23:07:20 ubuntu postfix/master[6291]: warning: process /usr/lib/postfix/trivial-rewrite pid 6417 exit status 1 Mar 23 23:07:20 ubuntu postfix/master[6291]: warning: /usr/lib/postfix/trivial-rewrite: bad command startup -- throttling

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• Grizzly server - works with IP, but not with domain name

  - by Hitchhiker

  I'm hosting a grizzly web service on a Windows 7 Pro machine (embedded in a regular Java process), and it is binding to http://my-domain-name. When trying to hit the service from another machine, requests to http://my-domain-name fail (fiddler shows error code 502), but requests to http://my-ip work. When the service runs on a Windows Server 2008 machine, this doesn't happen (both requests succeed). What could be the issue?

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• Is auto-logon on laptop with encrypted hard drive secure?

  - by Tobias Diez

  I have the complete hdd of my laptop encrypted (with the Windows built-in Bitlocker) and thus have to login two times upon booting (Bitlocker and user account). Since I'm the only person using the computer (and knowing the Bitlocker password), I was thinking about automatically login into the user account to make the boot process smoother and quicker. In which cases/scenarios is this a bad idea and the additional login gives a true additionally layer of security?

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• Can mod_fcgid maintain a hard-minimum number of available appserver processes?

  - by user9795

  ...and if so, how? I'm using Apache2 + mod_fcgid to serve a perl Catalyst application, on a box that I own, and I'd like for mod_fcgid to maintain a minimum number of spun-up processes ready to go. The docs say that FcgidMinProcessesPerClass only enforces a minimum number of processes that will be retained in a process class after finishing requests How do I get apache to start up with a certain number of appserver subprocesses on an idle server without using artificial load to get there?

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• ESX Install........

  - by ov4

  HI all, I recently purchases a bunch of r710 from dell, i installed esx on it. the installation process finished without a problem. however once the esx boot the following error displays at the botton with red letters 00:00:02:21.493 cpu11:4119) mod:2971: Initialization for vmfs2 failed with -1 i installed on two different servers and the same error pops up. the curius thing is that if i install esxi 3.5 or 4 there is not problem help Thanks Oscar

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• How to handle many daily emails from cron efficiently?

  - by drumfire

  With each new server comes at least one more daily crontab email. The FreeBSD servers even send two: a daily and a security run output. Thanks to my obsession with virtualisation the number of emails I need to read (and then often discard without further action) is becoming too much. What ways are there to manage / automate this process? Can emails be replaced by something that is web based? Surely some of you must have found creative ways for this.

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• Is it okay to use a SSH key with an empty passphrase?

  - by mozillalives

  When I first learned how to make ssh keys, the tutorials I read all stated that a good passphrase should be chosen. But recently, when setting up a daemon process that needs to ssh to another machine, I discovered that the only way (it seems) to have a key that I don't need to auth at every boot is to create a key with an empty passphrase. So my question is, what are the concerns with using a key with no passphrase?

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