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• Testing for disk write

  - by Montecristo

  I'm writing an application for storing lots of images (size <5MB) on an ext3 filesystem, this is what I have for now. After some searching here on serverfault I have decided for a structure of directories like this: 000/000/000000001.jpg ... 236/519/236519107.jpg This structure will allow me to save up to 1'000'000'000 images as I'll store a max of 1'000 images in each leaf. I've created it, from a theoretical point of view seems ok to me (though I've no experience on this), but I want to find out what will happen when there will be directories full of files in there. A question about creating this structure: is it better to create it all in one go (takes approx 50 minutes on my pc) or should I create directories as they are needed? From a developer point of view I think the first option is better (no extra waiting time for the user), but from a sysadmin point of view, is this ok? I've thought I could do as if the filesystem is already under the running application, I'll make a script that will save images as fast as it can, monitoring things as follows: how much time does it take for an image to be saved when there is no or little space used? how does this change when the space starts to be used up? how much time does it take for an image to be read from a random leaf? Does this change a lot when there are lots of files? Does launching this command sync; echo 3 | sudo tee /proc/sys/vm/drop_caches has any sense at all? Is this the only thing I have to do to have a clean start if I want to start over again with my tests? Do you have any suggestions or corrections?

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• Linux And NTFS Permissions

  - by VGE IT

  Trying to restrict a folder within a directory created in linux filesystem. I have changed the permissions to: root rwx, a special active directory group rwx and all others r. Upon doing so, people that are not in the special AD group can access the directory and modify files. Upon doing so the group changes to "Domain Users" when the user modifies documents within the directory. I have to manualy change the documents default group back to my AD group. I have tried to create another AD group and modify permissons to deny write access. When doing so through windows explorer, the settings seem to take affect until I go back in a look at permissions for the restricted group. No permissions show when I view for the second time. Please assist. Samba share properties [MyShare] comment = "blah blah blah" browseable = yes guest ok = no read only = no path = /xxx/xxxxx/ create mask = 0640 directory mask = 0750 admin users = @"domain\Domain Admins", @"domain\group A", @"domain\group B" valid users = @"domain\Domain Admins", @"domain\group A", @"domain\group B" nt acl support = Yes inherit acls = yes inherit owner = yes inherit permissions = yes

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• Excel - "send to Mail recipient" creates 2nd copy of EMail in Inbox

  - by ssollinger

  When sending Excel sheets using the menu item "File" - "Sent To" - "Mail recipient (as attachment)" I get additional copies of the email in the Inbox. When I press "send" then I get 2 copies of the email in Outlook - as expected one in the Outbox (which moves into the Sent folder as soon it is sent off) and an additional one in the Inbox. How do I stop the copy message appearing in the Inbox? System: Excel 2000, Outlook 2000, Windows XP. Antivirus is AVG Free 2011. I know this is a very old system, but it is not my PC and there isn't any chance to get it replaced in the near future yet. SOme further details: The copy in the inbox appears at the same time as the normal copy goes into the Outbox (i.e. as soon I press send). It doesn't contain anything in the From field (i.e. there is no sender, just the recipient of the mail). It has a different icon in Outlook to the other emails - the icon is the one for "saved or unsent message". I tried it with a few different spreadsheets and it happens with all of them. It happens with every recipient, and it only happens if sending from within Excel (i.e. using the Send to menu item). I can delete the attachment before sending and it will still create a copy. If I create a new message in Outlook and then add the Excel document as attachment then I don't get the copy of the message in the inbox, it only happens when using the send to item in Excel. It only started doing this recently. Around that time the Antivirus (AVG Free) was upgraded to the latest version (from the previous version - 2010? - to version 2011), but this might not be related. I thought I know Excel really well but have never seen this happening before, and I can't find any setting in Excel or Outlook that is causing this. Any ideas?

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• Mounting a VirtualBox shared folder on boot with fstab in OpenSuse 11.3

  - by ccook

  I have followed the steps found here, however, the share is not mounted on boot. The share will mount if i run 'mount -a' after booting. Why would the share not mount on boot? 1 - Set up a Virtual Machine and install OpenSUSE 11.2 2 - Create a shared folder on host (HostFolder) 3 - Setup the shared folder in Virtualbox Via the Virtual Machine details or via Devices Shared Folders... 4 - Install dependencies for running the Virtualbox installer You need to install the right development kernelpackage for your machinetype (use 'zypper search -i kernel' to see what's installed) sudo zypper install make gcc kernel-source kernel-hosttype/default-devel 5 - Run the Virtual Machine and go to Devices Guest Additions This mounts an iso image in your OpenSUSE guest. 6 - Open a root terminal and run cd /usr/src/linux make oldconfig && make prepare && make scripts && make dep cp ../linux-obj/$HOSTTYPE/default/Module.symvers . make prepare A commenter on previously mentioned thread says this step is unnecessary but it doesn't work without on my system. I suggest trying step 7 first and returning to step 6 if that fails. * 7 - Run ./VirtualboxLinux yourhosttype .run from the mounted iso image. 8 - Create shared folder in OpenSUSE (GuestFolder) 9 - Test with sudo mount -t vboxsf HostFolder /home/user/GuestFolder It works? Great! Let's set up the system so it automounts for your regular useraccount instead of root-only access. 10 - Add this line to /etc/fstab HostFolder /home/user/GuestFolder vboxsf defaults,uid=1000,gid=1000 0 0 11 - It works for me but if it still doesn't automount after a reboot; sudo mount -a

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• Using a named pipe to simulate a serial port on a VMware virtual machine (linux host and client)

  - by Dave M

  Trying to write a python program to create a simulated data stream and feed it, through a named pipe, to a VMware virtual machine. The host is running Ubuntu 11.10 and VMware player 5.0.0. The Vm is running Ubuntu netbook 10.04. I am able to get the pipe working on the local machine but I am not able to get the pipe to pass data through the virtual serial port to the programs running on the virtual machine. #!/usr/bin/python import os # # Create a named pipe that will be used as the serial port on a VMware virtual machine SerialPipe = '/tmp/gpsd2NMEA' try: os.unlink(SerialPipe) except: pass os.mkfifo(SerialPipe) # # Open the named pipe NMEApipe = os.open(SerialPipe, os.O_RDWR|os.O_NONBLOCK) # # Write a string to the named pipe NMEAtime = "235959" os.write(NMEApipe, str( '%s\n' % NMEAtime )) Test to see if the python program is working on the host machine (displays 235959 if data is passing through the pipe) $ cat /tmp/gpsd2NMEA 235959 Serial port as defined in the VMware .vmx file: serial0.present = "TRUE" serial0.startConnected = "TRUE" serial0.fileType = "pipe" serial0.fileName = "/tmp/gpsd2NMEA" serial0.pipe.endPoint = "client" serial0.autodetect = "FALSE" serial0.tryNoRxLoss = "TRUE" serial0.yieldOnMsrRead = "TRUE" Test to see if the serial port in the VM is receiving data $ cat /dev/ttyS0 or $ minicom -D /dev/ttyS0 or $ stty -F /dev/ttyS0 cs8 -parenb -cstopb 115200 $ echo < /dev/ttyS0 None of these display any data from the python program.

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• Is there a free PDF printer / distiller that creates signable documents?

  - by Coderer

  I've used various methods (mentioned elsewhere on this site) to create PDFs, using a printer driver or converting from PostScript, etc. The common problem is that if I open any of the output files in the newer versions of Adobe Reader, there's an option to "Place Signature" but it's greyed out, or gives an error message that the feature has been disabled for this document. As far as I can tell, there's an option set somewhere in the document metadata that tells Reader "allow the user to sign this document", or don't. None of the free/open source tools that have been been linked to in other SU posts have had this listed as an option (though to be fair I haven't actually downloaded and tried all of them). Is there a tool that does this? Can I just poke a bit with a hex editor somewhere to turn on this functionality? I can sometimes get access to Acrobat Professional to turn on this option, but doing it for every desired case would be more work than I care to do. The current workaround for single-page documents is: Print the document to PDF (possibly via postscript) Open a single-page blank PDF with the "signable" bit turned on in Reader create a custom "stamp" using the Reader markup tools, by importing the printed-to document "stamp" an image of the printed document on the blank page, hoping to get it centered about right place a signature over the document-but-not-really you just stamped This obviously does not scale well at all. It would be much better if I could: Print the document to PDF Drag the document to a simple shortcut / tool / whatever Open the document in Reader Place a signature in the document ETA: Sorry, maybe I should have been clearer -- I'm talking about the certificate-based digital signing available in Adobe Reader, not adding a virtual ink signature. Also, any solution really would have to be available offline.

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• How do I set up a shared directory on Linux?

  - by JR Lawhorne

  I have a linux server I want to use to share files between users in my company. Users will access the machine with sftp or secure shell. Here is what I have: cd /home ls -l drwxrwsr-x 5 userA staff 4096 Jul 22 15:00 shared (other listings omitted) I want all users in the staff group to be able to create, modify, delete any file and/or directory in the shared folder. I don't want anyone else to have access to the folder at all. I have: Added the users to the staff group by modifying /etc/group and running grpconv to update /etc/gshadow Run chown -R userA.staff /home/shared Run chmod -R 2775 /home/shared Now, users in the staff group can create new files but they aren't allowed to open the existing files in the directory for edit. I suspect this is due to the primary group id associated with each user which is still set to be the group created when the user was created. So, the PGID of user 'userA' is 'userA'. I'd rather not change the primary group of the users to 'staff' if I can help it but if it is the easiest option, I would consider it. And, a variation on a theme, I'd like to do this same thing with another directory but also allow the apache user to read files in the directory and serve them. What's the best way to set this up?

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• Windows: How to make programs think they're not running in a terminal server session?

  - by sinni800

  I am using the program "SoftXPand 2011 Duo" by Miniframe on my Windows 7 PC. It makes two workstations out of one computer. It uses the terminal services built into Windows to create the additional session. I use two screens, two keyboards and two mice to create this "illusion" of two computers. It works quite well and I can even play two different 3D games on the two screens attached to this single machine (using a Radeon HD5770 and a Core i5 2500k with 8 Gbytes RAM). There are a few downsides to this. I just found about one that is hidden on the first look. The sessions you are in (even on the first workstation) will identify as a terminal server session! Now some programs will run with limited effects (graphical), and some won't run at all. This also resulted in some games not running at all. They just say "Cannot be run in a terminal server session" and exit. I have already proven that top modern games (DirectX 10, 11) run just as good as on the same machine without SoftXPand, so this is a pretty artificial limitation! So, can I somehow hack my current session so it doesn't look like a terminal server session anymore? I. E. #include <windows.h> #pragma comment(lib, "user32.lib") BOOL IsRemoteSession(void) { return GetSystemMetrics( SM_REMOTESESSION ); } Will return FALSE? (Not a programming question! Just an example how programs detect if they're in a terminal server session!)

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• Is there a way to exclude a specific drive vdi from "snapshots" in VirtualBox?

  - by Graza

  ...or is there another space-efficient way of dealing with the page/swap file of the Guest O/S? I've realised that its quite possible/likely that one of the things which "bloats" the snapshot/diff vdi's when a snapshot is taken is the guest operating system's pagefile. For example, say I have a 2Gb swap-file in a Windows guest OS, and over the course of a few weeks the usage of the swap file has gone over 1Gb a couple of times. When I next create a snapshot, it seems likely that I'd be almost guaranteed around 1Gb of space taken up in the new differencing disk just because of changes in the swap file. Obviously (provided I never did "live" snapshots on running or paused machines, and only ever did them when the machine was shut down), I would not need any of the information in the swap file to be saved. So this would simply be a waste of 1Gb. I'm wondering if there's a way to attach a vdi to a VM and flag it as "exclude from snapshots" - which would mean I could put the swap file on a different vdi which would never be included in a snapshot. Or if anyone has any other suggestions. Or an explanation about why it might not be an issue. I could obviously delete and recreate a swap drive vdi every time I did a snapshot to achieve the same effect, but this is a little more effort than simply clicking "create snapshot"....

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• Samba between Ubuntu server 10.10 and Windows Vista, Windows 7

  - by chepukha

  I have a linux box running Linux server ubuntu 10.10. I have installed Samba on this linux box and want to share files with my laptops which run Windows Vista home and Windows 7 home. I have been struggling with the setup for almost a month but couldn't get it right. If I try to access share folder from Windows Vista, I get message "Windows cannot access \\server_ip_address". Error code: 0x80070035. The network path was not found. If I access from Windows 7, then after entering password to login I can see the list of share folders on Linux box. But if I click on a share folder, I get the same error message as above. Tail /var/log/samba/log.windows7-pc I got the following message: [2011/03/16 00:17:41.427238, 0] smbd/service.c:988(make_connection_snum) canonicalize_connect_path failed for service sharemedia, path /root/sharemedia Here is my setting in smb.conf [global] share modes = yes netbios name = Samba workgroup = WORKGROUP wins support = yes encrypt passwords = true [sharemedia] comment = Tesing sharing using Samba path=/root/sharemedia/ public = yes valid users = samba_usr_name ; make sure all files are sensible permissions create mask = 0660 force create mask = 0660 directory mask = 2770 force directory mask = 2770 directory security mask = 0000 ; Normal share parameters read only = no browseable = yes writable = yes guest ok = no

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• Differential backup missing moved folders (flawed archive attribute logic)

  - by Max

  Recently I've discovered that my backup system it flawed: there are situation where various files/folders are missed. I do my backup from local disk to a network NAS. I use Cobian backup, and I have setup the backup software to create one full backup every week, and one differential backup every day. Now, the backup software (to my knowledge any backup software work this way) decide the files that go in the differential backup by looking at the file archive attribute. If the attribute is set, then the file go in to the backup. Now, when you move a file to a new location, on Windows systems, the archive attribute get set and the file is included in the backup, and that's fine... but when you move an entire folder, no archive attribute is set, nor on the folder, nor in any files inside the folder, so the moved folder isn't included in the differential backup! So, if you have a full backup plus a differential backup, and you moved folders around... then it's impossible to reconstruct the original files/folders structure starting from the full+differential backup, because the backup software didn't include the moved folders in the differential backup. So my differential backup are useless... Why does windows set the archive attribute when moving a file, but not when moving a folder? How can I deal with this issue? Is there a way to create a differential backup that works as it's supposed to do? Doing full backup every day is not practical, because the changed data is about 0.1% at day (by using a differential backup I can keep 4 weeks of files history without using too much disk space.)

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• Are my Linux symbolic links acting correctly?

  - by Andy Castles

  Hi all I've been using Linux on and off for the last 15 years and today I came across something in bash that surprised me. Setup the following directory structure: $ cd /tmp $ mkdir /tmp/symlinktest $ mkdir /tmp/symlinktest/dir $ mkdir /tmp/symlinktarget Now create two sym links in symlinktest pointing to symlinktarget: $ cd /tmp/symlinktest $ ln -s ../symlinktarget Asym $ ln -s ../symlinktarget Bsym Now, in bash, the following tab completion does strange things. Type the following: $ cd dir $ cd ../A[TAB] Pressing the tab key above completes the line to: $ cd ../Asym/ as I expected. Now press enter to change into Asym and type: $ cd ../B[TAB] This time pressing the tab key completes the link to: $ cd ../Bsym[space] Note that there is now a space after the Bsym and there is no trailing slash. My question is, why when changing from the physical directory "dir" to Asym it recognises that Asym is a link to a directory, but when changing from one sym link to another, it doesn't recognise that it's a link to a directory? In addition, if I try to create a new file within Asym, I get an error message: $ cd /tmp/symlinktest/Asym $ cat hello > ../Bsym/file.txt -bash: ../Bsym/file.txt: No such file or directory I always thought that symlinks were mostly transparent except to programs that need to manipulate them. Is this normal behaviour? Many thanks, Andy

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• Better logging for cronjob output using /usr/bin/logger

  - by Stefan Lasiewski

  I am looking for a better way to log cronjobs. Most cronjobs tend to spam email or the console, get ignored, or create yet another logfile. In this case, I have a Nagios NSCA script which sends data to a central Nagios sever. This send_nsca script also prints a single status line to STDOUT, indicating success or failure. 0 * * * * root /usr/local/nagios/sbin/nsca_check_disk This emails the following message to root@localhost, which is then forwarded to my team of sysadmins. Spam. forwarded nsca_check_disk: 1 data packet(s) sent to host successfully. I'm looking for a log method which: Doesn't spam the messages to email or the console Don't create yet another krufty logfile which requires cleanup months or years later. Capture the log information somewhere, so it can be viewed later if desired. Works on most unixes Fits into an existing log infrastructure. Uses common syslog conventions like 'facility' Some of these are third party scripts, and don't always do logging internally. UPDATE 2010-04-30 In the process of writing this question, I think I have answered myself. So I'll answer myself "Jeopardy-style". Is there any problem with this method? The following will send any Cron output to /usr/bin//logger, which will send to syslog, with a 'tag' of 'nsca_check_disk'. Syslog handles it from there. My systems (CentOS and FreeBSD) already handle log rotation. */5 * * * * root /usr/local/nagios/sbin/nsca_check_disk 2>&1 |/usr/bin/logger -t nsca_check_disk /var/log/messages now has one additional message which says this: Apr 29, 17:40:00 192.168.6.19 nsca_check_disk: 1 data packet(s) sent to host successfully. I like /usr/bin/logger , because it works well with an existing syslog configuration and infrastructure, and is included with most Unix distros. Most *nix distributions already do logrotation, and do it well.

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• BIND zones and named files

  - by preethika

  I've installed BIND in my Windows server2003. i've configured the named file in C:\named\etc\named.conf as: options { directory "c:\named\zones"; allow-transfer { none; }; recursion no; }; zone "tisdns.com" IN { type master; file "db.tisdns.com.txt"; allow-transfer { none; }; }; My zone file is configured in C:\named\zones\db.tisdns.com.txt as: $TTL 6h @ IN SOA ns1.tisdns.com. hostmaster.tisdns.co… ( 2010010901 10800 3600 604800 86400 ) @ NS ns1.tisdns.com. ns1 IN A 192.168.0.17 mug IN A 192.168.0.103 key "rndc-key" { algorithm hmac-md5; secret "M0oW24WFQZhMu9wTq8qepw=="; }; controls { inet 127.0.0.1 port 53 allow { 127.0.0.1; } keys { "rndc-key"; }; }; In the above i've given the name to the domain as "tisdns". i want to create a new domain name in a different zone file. how can i create it?

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• Converting software RAID1 to RAID10 for /boot

  - by luckytaxi

  Array info: /dev/md0 - /dev/sda1 and /dev/sdb1 /dev/md2 - /dev/sda2 and /dev/sdb2 Partition info: /boot - /dev/md0 / - /dev/md1 I have two drives that are setup as RAID1 using software RAID on Redhat. I added two additional drives (same size) and I would like to conver the RAID1 to a RAID10. The problem I'm having is adding the last drive to the array. I've gotten as far as creating a RAID10 with two missing devices but as soon as I add the last drive, all hell breaks loose. It seems /dev/sda1 is the culprit. What I'm not too sure about is how to create the RAID10. I've tried the following mdadm --create /dev/md2 --level=raid10 --raid-device=4 /dev/sdc1 missing /dev/sdd1 missing I then proceeded to fail /dev/sdb1 from /dev/md0 and added that partition to /dev/md2. I proceeded to install the MBR on EACH partition since boot resides on /dev/sdx1 on each drive. As a test, all is well, I'm able to boot back into the system once I do a quick reboot. Now, when I go add the last drive /dev/sda1, it breaks. I attempted to install grub on /dev/sda1 and I get the following ... grub> root (hd0,0) /dev/sda root (hd0,0) /dev/sda Filesystem type is ext2fs, partition type 0xfd grub> setup (hd0) setup (hd0) Checking if "/boot/grub/stage1" exists... no Checking if "/grub/stage1" exists... no Error 2: Bad file or directory type At this point, the array is hosed I believe. I rebooted the server and it refuses to boot.

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• What are the steps needed to set up and use security for AWS command line tools?

  - by chris

  I've been trying to set up the AWS command-line tools following Eric's most useful guide at http://alestic.com/2012/09/aws-command-line-tools. I can't seem to find a good how-to for how to generate the x509 certificate and private key, and how that relates to the various security files the guide creates. Update: I have found a couple of links that describe the some steps. These steps seem to work, however I'm not sure if this is secure & the best way to do it: 1) Create a private key openssl genrsa -out my-private-key.pem 2048 2) Create x.509 cert openssl req -new -x509 -key my-private-key.pem -out my-x509-cert.pem -days 365 Hit enter to accept all of the defaults. Then, from the IAM Dashboard, User, select a user & click on the "Security Credentials" tab. Click on "Manage Signing Certificates", then "Upload Signing Certificate", paste in the contents of my-x509-cert.pem, click OK and it should be accepted. One step that is discussed, but not required for me, was the addition and subsequent removal of a pass phrase on the private key. Should I have been prompted for one, and is my cert potentially unsafe because of this?

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• arrays in puppet

  - by paweloque

  I'm wondering how to solve the following puppet problem: I want to create several files based on an array of strings. The complication is that I want to create multiple directories with the files: dir1/ fileA fileB dir2/ fileA fileB fileC The problem is that the file resource titles must be unique. So if I keep the file names in an array, I need to iterate over the array in a custom way to be able to postfix the file names with the directory name: $file_names = ['fileA', 'fileB'] $file_names_2 = [$file_names, 'fileC'] file {'dir1': ensure => directory } file {'dir2': ensure => directory } file { $file_names: path = 'dir1', ensure =>present, } file { $file_names_2: path = 'dir2', ensure =>present, } This wont work because the file resource titles clash. So I need to append e.g. the dir name to the file title, however, this will cause the array of files to be concatenated and not treated as multiple files... arghh.. file { "${file_names}-dir1": path = 'dir1', ensure =>present, } file { "${file_names_2}-dir2": path = 'dir1', ensure =>present, } How to solve this problem without the necessity of repeating the file resource itself. Thanks

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• mkfs Operation Takes Very Long on Linux Software Raid 5

  - by Elmar Weber

  I've set-up a Linux software raid level 5 consisting of 4 * 2 TB disks. The disk array was created with a 64k stripe size and no other configuration parameters. After the initial rebuild I tried to create a filesystem and this step takes very long (about half an hour or more). I tried to create an xfs and ext3 filesystem, both took a long time, with mkfs.ext3 I observed the following behaviour, which might be helpful: writing inode tables runs fast until it reaches 1053 (~ 1 second), then it writes about 50, waits for two seconds, then the next 50 are written (according to the console display) when I try to cancel the operation with Control+C it hangs for half a minute before it is really canceled The performance of the disks individually is very good, I've run bonnie++ on each one separately with write / read values of around 95 / 110MB/s. Even when I run bonnie++ on every drive in parallel the values are only reduced by about 10 MB. So I'm excluding hardware / I/O scheduling in general as a problem source. I tried different configuration parameters for stripe_cache_size and readahead size without success, but I don't think they are that relevant for the file system creation operation. The server details: Linux server 2.6.35-27-generic #48-Ubuntu SMP x86_64 GNU/Linux mdadm - v2.6.7.1 Does anyone has a suggestion on how to further debug this?

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• How to set up hosts file for local environment?

  - by n00b0101

  I'm trying to create subdomains on my localhost and am way out of my territory... I'm running MAMP on my Mac OS X and I thought/think I had/have to do the following: (Assuming I want to create me.localhost.com and you.localhost.com) (1) Edit /private/etc/hosts Right now, it looks like this: 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost So, do I just make it: 127.0.0.1 localhost 127.0.0.1 me.localhost.com 127.0.0.1 you.localhost.com 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost (2) I'm assuming I don't need to mess with DNS at all because it's local? So, the hosts file should suffice? (3) And then, I need to edit my httpd.conf file to include virtual hosts? I tried this, but it's not picking it up... NameVirtualHost * <VirtualHost *> DocumentRoot "/Applications/MAMP/htdocs" ServerName localhost </VirtualHost> <VirtualHost *> DocumentRoot "/Applications/MAMP/htdocs/me.localhost.com" ServerName me.localhost.com </VirtualHost> <VirtualHost *> DocumentRoot "/Applications/MAMP/htdocs/you.localhost.com" ServerName you.localhost.com </VirtualHost> Not sure if I'm way off-base here... Help is greatly appreciated!

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• E-mail duplication problem

  - by Gavin Osborn

  I have taken out a hosting agreement with a well respected hosting provider for a couple of internet facing servers. We have deployed several applications to these servers which send various e-mails back to us for reporting purposes. Context: Each server runs Windows Server 2003 R2 with the IIS 6.0 SMTP service installed. Each application is configured to use the local instance of IIS to send e-mails. The external IP address of each server is mapped to a particular domain eg: server1.mydomain.com server2.mydomain.com These e-mails are sent from a company domain name and not the domain name of the hosted servers (eg: [email protected]) Symptoms: A small number (<1%) of e-mails sent from these applications appear to be duplicated. These are exact duplicate in terms of both content and message headers. The Fix: I contacted my hosting provider and they told me this was a common problem & instructed me to: Change the HELO response of your mail server service to a FQDN (server1.mydomain.com && server2.mydomain.com) Create a DNS A record that resolves the FQDN of your mail server to the primary IP address of your sending mail server. Create a PTR record that resolves your primary IP address back to your mail server's FQDN In the sending domain's (mycompanydomain.com) DNS zone file, add the appropriate SPF record for your hosted servers. eg: v=spf1 a mx include:mydomain -all The Problem Continues: I made all of the changes as prescribed above, I was a little hesitant because these steps seemed to suggest they were more for stopping your messages getting blocked than they were for stopping them from being duplicated - but I am certainly no expert in these matters. It has been 5 days since I applied this fix and the problem still persists. I am certain that these problems are not a bug in the software because they are 4 different applications installed on 2 different servers, all of whom are exhibiting this strange behaviour. This behaviour has also not been seen in our UAT environment. Were my hosts correct to suggest this fix? If not, does anyone know what could be the cause of this problem? Many Thanks

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• Howto disable SSH local port forwarding ?

  - by SCO

  I have a server running Ubuntu and the OpenSSH daemon. Let's call it S1. I use this server from client machines (let's call one of them C1) to do an SSH reverse tunnel by using remote port forwarding, eg : ssh -R 1234:localhost:23 login@S1 On S1, I use the default sshd_config file. From what I can see, anyone having the right credentials {login,pwd} on S1 can log into S1 and either do remote port forwarding and local port forwarding. Such credentials could be a certificate in the future, so in my understanding anyone grabbing the certificate can log into S1 from anywhere else (not necessarily C1) and hence create local port forwardings. To me, allowing local port forwarding is too dangerous, since it allows to create some kind of public proxy. I'm looking for a way tto disable only -L forwardings. I tried the following, but this disables both local and remote forwarding : AllowTcpForwarding No I also tried the following, this will only allow -L to SX:1. It's better than nothing, but still not what I need, which is a "none" option. PermitOpen SX:1 So I'm wondering if there is a way, so that I can forbid all local port forwards to write something like : PermitOpen none:none Is the following a nice idea ? PermitOpen localhost:1

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• How do I add a WMware ESXi Host to Microsoft Virtual Machine Manager?

  - by user63250

  I am trying to manage virtual machines running on a VMware ESXi host using Microsoft System Center Virtual Machine Manager. I was able to add the ESXi machine using the "Add VMware VirtualCenter server" option, but can't access any of the VMs on the datastore associated with this ESXi server. The datastore of the ESXi box is showing up with the correct name, but it won't let me see any of the VMs that have already been created; I get "There are no virtual machines on this host." Because I couldn't get any of the existing virtual machines to show up, I tried creating some new ones. When using VMM to connect to ESXi and create new VMs, I get the following error messages in the "rating explanation" section: The virtualization software on the selected host does not support virtual hard disks on an IDE bus. and The virtualization software on the host XXXXXX does not support the creation of dynamic virtual hard disk. Any ideas on why I can't manage existing machines and why I can't create new ones? The existing machines were created in vSphere. I should note that the ESXi server and the server running SCVMM are both on the same domain. I should also note that although the ESXi box has been added as a VirtualCetner server, when I try to add it through the "Add Host" option, I get an error message saying "Virtual Machine Manager cannot complete the VirtualCenter action on server EXSi because of the following error: The operation is not supported on the object."

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• Cannot write samba shares

  - by Batsu

  Running samba 3.5 on Red Hat Enterprise 6.1 I'm having issues sharing two folders. Here is the output of testparm: [global] workgroup = DOMAINNAME server string = Samba Server Version %v interfaces = lo, eth1 bind interfaces only = Yes map to guest = Bad User log file = /var/log/samba/log.%m max log size = 50 idmap uid = 16777216-33554431 idmap gid = 16777216-33554431 hosts allow = 10.50.183.48, 10.50.184.41, 10.50.184.199, 10.50.183.160, 127.0.0.1 hosts deny = 0.0.0.0/0 cups options = raw [test] comment = test folder path = /usr/local/samba valid users = claudio write list = claudio force user = claudio read only = No create mask = 0775 directory mask = 0775 [test2] comment = another test path = /home/claudio/tst valid users = claudio write list = claudio force user = claudio read only = No create mask = 0775 From the Windows XP machine I'm connecting from I'm able to read test but not write, while for test2 I can't even access the folder (though I can see it listed). ls -l /usr/local ... drwxrwxrwx. 2 claudio claudio 4096 Dec 3 10:39 samba ... ls -l /user/local/samba total 32 -rwxrwxrwx. 1 claudio claudio 9 Nov 29 16:26 asd.txt -rwxrwxrwx. 1 claudio claudio 728 Dec 3 10:16 out.txt ... ls -l /home/claudio/ ... drwxrwxr-x. 2 claudio claudio 4096 Dec 3 09:57 tst ... ls -l /home/claudio/tst total 4 -rw-rw-r--. 1 claudio claudio 4 Dec 3 09:57 asd.txt Any suggestion?

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• How do I increase the buffer size for domain sockets in OS X 10.6

  - by Chas. Owens

  In Linux I have no problem dumping tons of data into a domain socket, but the same code on OS X 10.6.2 blows up after about 65 records. The socket reader code looks like #!/usr/bin/perl use strict; use warnings; use IO::Socket; unlink "foo"; my $sock = IO::Socket::UNIX->new ( Local => 'foo', Type => SOCK_DGRAM, Timeout => 600, ) or die "Could not create socket: $!\n"; while (<$sock>) { chomp; print "[$_]\n"; } And the client code looks like #!/usr/bin/perl use strict; use warnings; use IO::Socket; my $sock = IO::Socket::UNIX->new ( Peer => 'foo', Type => SOCK_DGRAM, Timeout => 600, ) or die "Could not create socket: $!\n"; for my $i (1 .. 1_000_000) { print $sock "$i\n" or die $!; } close $sock; The error message I get is No buffer space available at write.pl line 15.. It seems fairly obvious that there is a difference in the buffer size between Linux and OS X, but I don't know how to set it OS X (or what the possible negative side effects might be).

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• Best practices for thin-provisioning Linux servers (on VMware)

  - by nbr

  I have a setup of about 20 Linux machines, each with about 30-150 gigabytes of customer data. Probably the size of data will grow significantly faster on some machines than others. These are virtual machines on a VMware vSphere cluster. The disk images are stored on a SAN system. I'm trying to find a solution that would use disk space sparingly, while still allowing for easy growing of individual machines. In theory, I would just create big disks for each machine and use thin provisioning. Each disk would grow as needed. However, it seems that a 500 GB ext3 filesystem with only 50 GB of data and quite a low number of writes still easily grows the disk image to eg. 250 GB over time. Or maybe I'm doing something wrong here? (I was surprised how little I found on the subject with Google. BTW, there's even no thin-provisioning tag on serverfault.com.) Currently I'm planning to create big, thin-provisioned disks - but with a small LVM volume on them. For example: a 100 GB volume on a 500 GB disk. That way I could more easily grow the LVM volume and the filesystem size as needed, even online. Now for the actual question: Are there better ways to do this? (that is, to grow data size as needed without downtime.) Possible solutions include: Using a thin-provisioning friendly filesystem that tries to occupy the same spots over and over again, thus not growing the image size. Finding an easy method of reclaiming free space on the partition (re-thinning?) Something else? A bonus question: If I go with my current plan, would you recommend creating partitions on the disks (pvcreate /dev/sdX1 vs pvcreate /dev/sdX)? I think it's against conventions to use raw disks without partitions, but it would make it a bit easier to grow the disks, if that is ever needed. This is all just a matter of taste, right?

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