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• Flexible classroom environments (OS, Office)

  - by HannesFostie

  I work in the IT department of a training center, we still offer XP and Office 2003 trainings but also offer Vista and Win7 and Office 2007. Currently, we use VMs on VMware Server but this is obviously not a superb choice. We're thinking of implementing something like VDI (brainstorm phase, we hardly have any details) but I decided to check here if people would have some clever alternatives. Requirements: * Flexible when it comes to deployment * Centralized management would be a big plus * Allow for different software, whether they be compatible or not (all of office except for outlook can be installed simultaneously. for outlook you need to choose between 2003 or 2007) * Allow for different OS We have a big enough budget to implement a proper SAN environment to accomodate the virtualization of the solution, whatever kind it may be. A support contract will probably be necessary as well, because we need to be able to offer quick solutions to problems and with only 2 sysadmins that is simply impossible to guarantee.

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• How to create custom content for nginx error 502 page, keep origin url on browser

  - by user123862

  i'm trying to get custom language and message for nginx error page but keep url on browser.. not success for eg: i go to url : xaluan.com/aaa/bbb.html on the time server down.. nginx will show error 502. with the same url but custom message as my language. test 1. I created a custom page at /usr/local/nginx/html/205.html as following config but it show on web site when error is default nginx error at domain.com/50.html ( the content of webpage not same as i created) error_page 502 /502.html; location = /502.html { root /usr/local/nginx/html; } test 2. Then i create same page at my www domain folder /home/xaluano/public_html/502.html but this keep redirect me to root domain.com/502.html the content now same as i created. but.. the url still not as i need error_page 502 /502.html; location = /502.html { root /home/xaluano/public_html; internal; } EDIT UPDATE for more detail 10/06/2012 please download my nginx config http://pastebin.com/7iLD6WQq and vhost config following: http://pastebin.com/ZZ91KiY6 == the case test.. if apache httpd service stop: #service httpd stop then open browser go to: xaluan.com/modules.php?name=News&file=article&sid=123456 I will see the 502 error with the same url on browser address == Custome error page I need the config which help when apache fail .. will show the custom message tell user wail for 1 minute for service back then refress current page with same url ( refresh I can do easy by javascript ), Nginx dosent change url so java-script can work out. any help will be great.. thank in advance

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• How to use Python to read the physical address(MAC ID) [closed]

  - by getjoefree

  I want to read the physical address of the NIC model, i can get the results that i want to with SED.EXE before, but SED.EXE does not support my environment but Python ok, who have the means to do it. The general situation (not plug the network cable, it is impossible to obtain IP address): Ethernet adapter: Connection-specific DNS Suffix.: Chianet Description ...........: Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller Physical Address .........: A4-BA-DB-9D-1E-8E Dhcp Enabled ...........: Yes Autoconfiguration Enabled ....: Yes Ethernet adapter 3: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Dell Wireless 1510 Wireless-N WLAN Mini-Card Physical Address. . . . . . . . . : 00-23-4D-D9-C0-28 The description of the NIC different, we can use this to fetch the corresponding physical address, base on Physical Address does not work, because the computer with the WLAN Card, I want to use Python to read my computer the card information and after Python handles an output file, output file format: SET MAC = A4BADB9D1E8E and sed format: ipconfig -all|sed -nrf getmac.sed | sed -e "s/-//g" > WINMAC.BAT getmac.sed: /Marvell Yukon 88E8040/ { n; s/.*: ([-0-9A-F]+)/set winmac=\1/p; }

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• Regarding traffic shaping on juniper SRX550

  - by peilin

  We have implemented the Juniper SRX550 in our company. Now we have one issue that how to restrict the internal user download speed from internet. Take one example that i want to restrict the end user with IP:192.168.1.20/32 downloading speed up to 1M via my external port ge-0/0/6.0. Below is my setting: [edit firewall policer p1M] root@SRX550# show if-exceeding { bandwidth-limit 1m; burst-size-limit 15k; } then discard; [edit firewall family inet] root@SRX550# show filter limit-user term 10 { from { destination-address { 192.168.1.20/32; } } then policer p1M; } term else { then accept; } [edit interfaces ge-0/0/6] root@SRX550# show per-unit-scheduler; unit 0 { family inet { filter { input limit-user; } address Hidden Here; } } As per the setting, the end user downloading speed should not exceed the 1m (125KB in windows), but the result is the downloading speed for this end users still can up to 400KB via HTTP/HTTPS. Please advise. Thanks.

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• tweak windows 7 virtual memory and cache / caching settings

  - by bortao

  im on windows 7 64 bit, with 4gb of memory whenever i copy or deal with a big ammount of data, windows swaps out everything from memory to the virtual memory swapfile, to make room to data cache. the problem is: i dont really need caching of this data im copying, its being copied only once, cacheing this data won't help me. on the other hand, swapping out the programs will give me a big lag time whenever i want to use those open programs again. what i want: restrict data cache to a certain ammount, lets say 1gb, or reserve a certain ammount of memory, lets say 2gb, exclusively for running programs memory. my swap file is on a separate partition, but i still have problems with swapping time.

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• tweak windows 7 virtual memory and cache / caching settings

  - by bortao

  im on windows 7 64 bit, with 4gb of memory whenever i copy or deal with a big ammount of data, windows swaps out everything from memory to the virtual memory swapfile, to make room to data cache. the problem is: i dont really need caching of this data im copying, its being copied only once, cacheing this data won't help me. on the other hand, swapping out the programs will give me a big lag time whenever i want to use those open programs again. what i want: restrict data cache to a certain ammount, lets say 1gb, or reserve a certain ammount of memory, lets say 2gb, exclusively for running programs memory. my swap file is on a separate partition, but i still have problems with swapping time.

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• Skydrive for desktop not showing icon in notification area

  - by jeruntime

  is this normal behavior? I'm concerned that some files will not be transferred. For example. I need to be sure that its safe to put my laptop to sleep so that later when I'm on my desktop I wont have to open up my laptop and sync again if I closed it too early. It doesn't even appear when I THINK it is syncing. Thanks for any help in advance. edit 1: Yeah I know the app isn't required or even offered anymore, but what I was wondering was if they had some way to tell if it's syncing or not. The old desktop app had an icon in the notification area which had a animation for when it was syncing, but now there isn't anything there. Although when I try to go in and make it appear it says the application isn't active and the icon will show the next time it is. Its version is 17.0.2015.0811 Is it possible to force the icon to show in the notification area if it isn't designed to show up there at all? I basically just want the same functionality of Skydrive on windows 8.

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• RAID Volume is no longer showing in Raid Controller BIOS and in Windows

  - by Gordon

  Hi all, I have installed some critical Windows Updates yesterday and now my external RAID Volume no longer shows in Windows Vista x64. All updates went through successfully. For their description, I cannot see how they should relate to the issue, but this is the only change that happened, so who knows. Anyway, here is the details: I have an external eSata enclosure that is running on a SiI4726 controller. I can connect to the controller with it's management utility from the computer the enclosure is connected to. The three drives in the enclosure show up as JBODs. I had those drives configured to be one logical RAID5 drive. RAID management is done through a SiI3132 SoftRaid controller. The Raid Management Utility just shows empty channels where it usually shows the Raid Group. In the Windows Disk Manager, I can see an unknown unitialized device. This is fine according to the setup manual. What it doesn't show is my Raid drive. It's gone. Also, when booting Windows, the BIOS of the controller used to show the RAID volume before booting the OS. This is not happening anymore. Updating drivers and firmware did not help. I have made sure the drivers and firmware are compatible to each others. And like I said, it used to work before. Any clues?

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• Failed to connect from slave to master with error "error connecting to master (1045)"

  - by Victor Lin

  I try to setup replication from slave to the master. CHANGE MASTER TO MASTER_HOST = 'master', MASTER_PORT = 3306, MASTER_USER = 'repl', MASTER_PASSWORD = 'xxx'; And I did grant privileges to the user on master. I can connect with mysql command from slave machine to the master mysql -h master -u repl -p mysql> show grants; GRANT RELOAD, SUPER, REPLICATION SLAVE, CREATE USER ON *.* TO 'repl'@'xxx' IDENTIFIED BY PASSWORD 'xxx' mysql> select 1; +---+ | 1 | +---+ | 1 | +---+ 1 row in set (0.04 sec) As you can see, privileges are correct, connection works fine, but however, the connection for replication to master always failed. mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: master Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: Read_Master_Log_Pos: 4 Relay_Log_File: slave-replay-bin.000002 Relay_Log_Pos: 4 Relay_Master_Log_File: Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 0 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1045 Last_IO_Error: error connecting to master 'repl@master:3306' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 1 row in set (0.00 sec) Is this caused by different version of MySQL server? The version of master is 5.0.77, and the slave is 5.5.13. But all articles I could find tell me that it's okay to replicate from a newer slave to old master. How to solve this problem? -- Update -- I even try to upgrade the old MySQL, but still, the problem is not solved. mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: master Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: master-bin.000007 Read_Master_Log_Pos: 107 Relay_Log_File: slave-replay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: master-bin.000007 Slave_IO_Running: Connecting Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 107 Relay_Log_Space: 107 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1045 Last_IO_Error: error connecting to master 'repl@master' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 1 row in set (0.00 sec)

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• Dash (-) in directory listing

  - by Mazzy

  I've Googled around for this to no avail, I'm sure its just something simple but I have not been able to figure this out perhaps because searching in Google or SF for a "-" can be problematic. I had a strange directory listing show up the other day in my git repository within Drupal. Listing my sites directory looks like this: -sh-4.1$ ls -al total 52 drwxr-xr-x 5 (hide) (hide) 4096 Dec 6 16:15 . drwxr-xr-x 24 (hide) (hide) 4096 Dec 11 16:22 .. -rw-rw-r-- 1 (hide) (hide) 24271 Dec 6 15:57 – drwxrwxr-x 4 (hide) (hide) 4096 Sep 17 11:53 all drwxr-xr-x 3 (hide) (hide) 4096 Sep 17 11:54 default drwxrwxr-x 8 (hide) (hide) 4096 Dec 11 17:40 .git -rw-rw-r-- 1 (hide) (hide) 476 Sep 17 11:53 .gitignore -rw-rw-r-- 1 (hide) (hide) 81 Sep 17 11:53 README.md This "-" file cannot be opened and does not appear to be a symlink, although when I execute "cd -" I get this: -sh-4.1$ cd - /home/sites/dev1.(hide).com That is coincidentally or not the users home directory, and the site's root directory. The other strange this is this entry does not show up for any other user browsing this same directory. Nor does it show up for other users period in their Git directories. The entry cannot be removed via RM. Running Centos 6.2 by the way...

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• size of extent on LVM2

  - by piotrek

  in LVM1 there was a limit of 65k extends. So size of extent had to been chosen carefully between wasted space on partitions (to big extent) and maximal possible size of logical volume (too small extent). in lvm2 (according to http://docstore.mik.ua/manuals/hp-ux/en/5992-4589/apa.html) the limit is ~16 million extents. so the default size of 4mb gives ~60TB of LV size. so is there any point in making the extent larger than 4-16mb on a desktop? is there any performance degradation or other costs of having big number of extents?

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• cpu load measure with hyperthreading on linux

  - by dronus

  How can I get the true usage of a multicore hyperthreading enabled cpu? For example lets consider a 2 core CPU, expressing 4 virtual cores. A single threaded workload would now show up as 100% in top, as one core of the virtual cores is completely used. The CPU and top work as expected, like there would be 4 real cores. With two threads however, the things get arkward: If all works well, they are balanced to the two real cores, so we got 200% usage: Two times 100% and two idle virtual cores, and are using all of the available CPU power. Seems ok to me. However, if the two threads would run on a single real core, they would show up as using two times 100%, that makes 200% virtual core usage. But on the real side, that would be one core sharing its power on the two threads, which are then using only one half of the total CPU power. So the usage numbers shown by top can not be used to measure the total CPU workload. I also wonder how hyperthreading balances two virtual on a real core. If two threads take a different amount of cycles, would the virtual cores 'adapt' so that both show a 100% load even if the real load differ?

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• ASA Slow IPSec Performance with Inconsistent Window Size

  - by Brent

  I have a IPSec link between two sites over ASA 5520s running 8.4(3) and I am getting extremely poor performance when traffic passes over the IPSec VPN. CPU on the devices is ~13%, Memory at 408 MB, and active VPN sessions 2. The load on both of the the devices is particularly low. Latency between the two sites is ~40ms. Screenshot of wireshark file transfer between the two hosts over the firewall IPSec VPN performing at 10MBPS. Note the changing window size. http://imgur.com/wGTB8Cr Screenshot of wireshark file transfer between the two hosts over the firewall not going over IPSec performing at 55MBPS. Constant window size. http://imgur.com/EU23W1e I'm showing an inconsistent window size when transferring over the IPSec VPN ranging in 46,796 to 65535. When performing at 55+MBPS, the window size is consistently 65,535. Does this show a problem in my configuration of the IPSec VPN in the ASA or a Layer1/2 issue? Using ping xxxxxx -f -l I finally get a non-fragment at 1418 bytes so 1418+28 for IP/ICMP headers = 1446. I know that I have 1500 set on the ASA and Ethernet. I do have "Force Maximum segment size for TCP proxy connection to be" "1380" bytes set under Configuration Advanced TCP Options on the ASA. Using IPERF, I am getting a "TCP Window Full" every few seconds and ~3 MBPS performance. http://imgur.com/elRlMpY Show Run on the ASA http://pastebin.com/uKM4Jh76 Show cry accelerator stats http://pastebin.com/xQahnqK3

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• Recommended boot partition size for Windows 7

  - by dwj

  I started using One Big Partition for everything and separating data out with folders when I got my current computer years ago. I'm preparing to upgrade my system from Windows XP to Windows 7 and I thought I might go back to putting my data on a separate partition. Most likely I'll just use the default OS install. My current Program Files tree has ~16 GB of stuff. Thinking ahead though, I've had XP installed for years. Who knows what apps I'm going to install down the line? This, of course, begs the question: How big do I make my Windows 7 install partition?

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• Looking for a Software to harden Windows machines

  - by MosheH

  I'm a network administrator of a small/medium network. I'm looking for a software (Free or Not) which can harden Windows Computers (XP And Win7) for the propose of hardening standalone desktop computers (not in domain network). Note: The computers are completely isolated (standalone), so i can't use active directory group policy. moreover, there are too many restriction that i need to apply, so it is not particle to set it up manual (one by one). Basically what I’m looking for is a software that can restrict and disable access for specific user accounts on the system. For Example: User john can only open one application and nothing else -- He don’t see no icon on the desktop or start menu, except for one or two applications which i want to allow. He can't Right click on the desktop, the task-bar icons are not shown, there is no folder options, etc... User marry can open a specific application and copy data to one folder on D drive. User Dan, have access to all drives but cannot install software, and so on... So far ,I've found only the following solutions, but they all seems to miss one or more feature: Desktop restriction Software 1. Faronics WINSelect The application seems to answer most of our needs except one feature which is very important to us but seems to be missing from WINSelect, which is "restriction per profile". WINSelect only allow to set up restrictions which are applied system-wide. If I have multiple user accounts on the system and want to apply different restrictions for each user, I cant. Deskman (No Restriction per user)- Same thing, no restriction per profile. Desktop Security Rx - not relevant, No Win7 Support. The only software that I've found which is offering a restriction per profile is " 1st Security Agent ". but its GUI is very complicated and not very intuitive. It's worth to mention that I'm not looking for "Internet Kiosk software" although they share some features with the one I need. All I need is a software (like http://www.faronics.com/standard/winselect/) that is offering a way to restrict Windows user interface. So IF anybody know an Hardening software which allows to set-up user restrictions on Windows systems, It will be a big, big, big help for me! Thanks to you all

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• How to clone and deploy multiple machines?

  - by Mimi

  Hi, See what I wanna do is basically make bootable clones or disc images or whatever(let's call it "stuff" for now ) and store many of them in a single big HDD. Then, I wanna use that big HDD and the "stuff" in it to be able to deploy new machines without the hassle of reinstalling Windows and whatnot(i.e. I do not want to restore nor simply clone a same machine, I literally want to use clones to save time during machine set up). Obviously I'd deploy the "stuff" onto an HDD going into a machine that I know the hardware of to avoid driver issues and whatnot. I alos have enough Windows keys to deal with the multiple activations. I tried using Acronis True Image but it doesn't seem to do what I want(unless idk how to use it properly). Any advice is welcome thanks :)

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• Problem with mydomain.com no prefix

  - by user10711

  Short question is. I have a domain name mydomain.com, we have a company website hosted on an IIS server 2003 configuration. Going to the address bar and typing www.mydomain.com will show my website properly. Typing mydomain.com into the same address bar will return an under construction website that seems to be hosted on my webserver. My domain name is hosted by Network Solutions, and I think I have it configured correctly using their advanced DNS services. In their settings I have www.mydomain.com, * and @ also pointed to the ip address of my webserver. On my webserver itself using the IIS manager, under the Web Site, and Web Site Identification. I have configured both www.mydomain.com and mydomain.com configured to work on the IP address on the webserver. I am hosting 4 different websites on my IIS server, all the other sites use prefixes other than www, an example is mail.mydomain.com and a couple of others. None of them show an under construction page as their default homepage. I am really at a loss as to why it would show an under construction page, especially since it seems to be pointing to the correct server. The reason this is such a big deal is because when you search for my company on google, the link there is for mydomain.com and by clicking on the link it shows under construction which is really quite embarrassing. Thanks in advance for any help and if there are further questions let me know.

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• What's the best solution for file sharing in my case? DAS or NAS?

  - by jakub

  I want to have in my network small, cheap and energy efficient server with will be fully customizable (Gnu/Linux, OpenBSD). What is more I want to have big, redundant storage in my network and access to it via server. I have already small terminal without hard drive (no SATA/PATA, one drive on USB) which works fine. I don't want to buy big server, or to use regular computer for that. It's not cheap. I thought about a small case (ITX?), and cheap computer in this with SATA ports, but I cannot find anything interesting :( I thought about NAS in network and server independently and booting server from NAS, I'm not sure which technologies will be good for that, and I don't know what with performance. Direct connection to NAS through network from workstation is next pro for that. What do you think about DAS? It will be good for that?

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• How to fix display on external Samsung Syncmaster shifted to the right when connected to Macbook Pro?

  - by joe larson

  Is there something special I need to do to be able to use external LCD displays with my new MacBook Pro? Do I need extra software, or do I possibly need a different cable? I'm attempting to use an external display with my MBP. I've got a "Mini DisplayPort to VGA Female Adapter for Mac", plugged into the thunderbolt port on my MBP, which I understood should be compatible with thunderbolt. I've tried this with three different SyncMaster models: a B2330 (21.5"), a EX2220 (22"), and a third (also 22" ish) which I don't have the model # for -- but all are 1920x1080 resolution; plus an additional HP monitor of similar size and resolution. In all four cases, the MBP recognizes the screen and choses the correct resolution. However, the display is shifted over about 1 inch. This is true no matter if I change screen resolutions also. The controls on the monitor for horizontal position don't help. Also, sometimes (especially if I drag an app over into the second screen), the screen starts skipping left to right and having bands of fuzz. Additionally, the monitor will periodically blink off for a moment, trying to switch from Digital to Analog and back (the Syncmaster shows text on the screen to tell you it's trying to do this). Often when it comes back from one of these blank-outs, it will show OK (no skipping or fuzz) but still shifted right; then after a few seconds it will go wrong again skipping and fuzzy. This photo shows the worst of it. I've added red rectangles to show the physical edge of the screen, and a yellow rectangle to show the empty space on the left of the screen. (Sorry for the awful quality and lighting!) Also, it's worth noting I am on Mac OS X 10.6.7, and yes I have this update 1.4 installed.

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• What's the best way to partition an SSD?

  - by Sander Rijken

  In case you're creating one partition, should it be as big as possible, or should a certain percentage of space be left unpartitioned?

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• mounting ext4 fs with block size of 65536

  - by seaquest

  I am doing some benchmarking on EXT4 performance on Compact Flash media. I have created an ext4 fs with block size of 65536. however I can not mount it on ubuntu-10.10-netbook-i386. (it is already mounting ext4 fs with 4096 bytes of block sizes) According to my readings on ext4 it should allow such big block sized fs. I want to hear your comments. root@ubuntu:~# mkfs.ext4 -b 65536 /dev/sda3 Warning: blocksize 65536 not usable on most systems. mke2fs 1.41.12 (17-May-2010) mkfs.ext4: 65536-byte blocks too big for system (max 4096) Proceed anyway? (y,n) y Warning: 65536-byte blocks too big for system (max 4096), forced to continue Filesystem label= OS type: Linux Block size=65536 (log=6) Fragment size=65536 (log=6) Stride=0 blocks, Stripe width=0 blocks 19968 inodes, 19830 blocks 991 blocks (5.00%) reserved for the super user First data block=0 1 block group 65528 blocks per group, 65528 fragments per group 19968 inodes per group Writing inode tables: done Creating journal (1024 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 37 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. root@ubuntu:~# tune2fs -l /dev/sda3 tune2fs 1.41.12 (17-May-2010) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: 4cf3f507-e7b4-463c-be11-5b408097099b Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 19968 Block count: 19830 Reserved block count: 991 Free blocks: 18720 Free inodes: 19957 First block: 0 Block size: 65536 Fragment size: 65536 Blocks per group: 65528 Fragments per group: 65528 Inodes per group: 19968 Inode blocks per group: 78 Flex block group size: 16 Filesystem created: Sat Feb 5 14:39:55 2011 Last mount time: n/a Last write time: Sat Feb 5 14:40:02 2011 Mount count: 0 Maximum mount count: 37 Last checked: Sat Feb 5 14:39:55 2011 Check interval: 15552000 (6 months) Next check after: Thu Aug 4 14:39:55 2011 Lifetime writes: 70 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: afb5b570-9d47-4786-bad2-4aacb3b73516 Journal backup: inode blocks root@ubuntu:~# mount -t ext4 /dev/sda3 /mnt/ mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

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• I think installing PostFix solved my problem, but it seemed *too* easy

  - by Joel Marcey

  Hi, This is a followup to a serverfault post I made a while ago: http://serverfault.com/questions/21633/how-do-i-target-a-different-mail-server-depending-on-domain-with-exim (More context here too: http://forum.slicehost.com/comments.php?DiscussionID=3806 ) I have a slice/VPS at Slicehost. I basically decided to scrap exim (i.e., purge it), and start anew with my email infrastructure. In case you didn't read any of the above threads, basically my goal was to have a send only mail infrastructure that relays all outgoing email to Google Apps. I also wanted to where email from domain1 (a Wordpress installation) would show it coming from domain1.com and email from domain2 (a normal website) would show it coming from domain2.com. So I decided to give PostFix a try. I literally followed the surprisingly simple instructions here: http://sudhanshuraheja.com/2009/02/slicehost-setup-outgoing-mail-google-apps-postfix/ And voila, all seems to be working as I expected. My email tests show email coming from the proper locations (either domain1 or domain2 depending on where the emails were sent from). But this all seemed too simple to me. So simple, in fact, that I feel that something is amiss. When I installed PostFix according to the instructions in the post above and it worked, I was surprised that I didn't have to specify an SMTP server, a port number, any authentication credentials, etc. My slice is set up such that I have MX records for Google Apps (e.g., ASPMX.L.GOOGLE.COM.) in my DNS settings, but I am not sure if that is why it is working. My email infrastructure knowledge is admittedly limited, but with this am I suspect to: Spammers using my email infrastructure? My emails going to people as spam? Something else sinister? I have actually stopped running PostFix until I understand this better. Thanks!

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• Can a slow internet-connection corrupt a file?

  - by Tony

  When downloading a big file, can a slow internet connection cause it to corrupt?

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• How to host a scalable social networking app

  - by christopher-mccann

  I am in the middle of developing a social networking application for a very select user niche which could scale to a few million users. Right now I have always hosted applications on RackSpace Cloud and I have no issues with them at all - always been a really good service and never had any downtime. My question is though does anyone think that cloud computing is not the way to host scalable web apps? Or can anyone with experience of this recommend a better solution. I have always shunned trying to run big servers from my own facilities as I think it seems silly to go to the expense of bringing in big alternative power supplies and all the other necessary precautions when other companies already do this. I looked at managed hosting services but this proved to be a bit too expensive for us at the start and the scalability of it wasnt good enough - it would take a day or two to get a new server provisioned. Therefore I ended up on a cloud platform. If anyone has any recommendations or advice it would be greatly appreciated.

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• My system administrator set up 2 databases that sync. Master-Master. However, these two databases a

  - by Alex

  DB1 and DB2. I made changes to DB1, and it does not seem to be on DB2. When I do "SHOW SLAVE STATUS\G" on DB2, there seems to be an error: mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: Master_User: Master_Port: Connect_Retry: 60 Master_Log_File: mysql-bin.0005496 Read_Master_Log_Pos: 5445649315 Relay_Log_File: mysqld-relay-bin.0041705 Relay_Log_Pos: 1624302119 Relay_Master_Log_File: mysql-bin.0004461 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 1062 Last_Error: Error 'Duplicate entry '4779' for key 1' on query. Default database: 'falc'. Query: 'INSERT INTO `log` (`anon_id`, `created_at`, `query`, `episode_url`, `detail_id`, `ip`) VALUES ('fdzn1d45kMavF4qbyePv', '2009-11-19 04:19:13', 'amazon', '', '', '130.126.40.57')' Skip_Counter: 0 Exec_Master_Log_Pos: 162301982 Relay_Log_Space: 136505187184 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL 1 row in set (0.00 sec) Then, I did show tables, and it seems like DB2 is lacking a table that I created on DB1...that means that for some reason, DB2 stopped syncing with DB1. How can I simply allow them to be in full synchronization again? All I want is DB2 to be exactly the same as DB1!

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