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• Mail Server configuration to accept all incoming message but option to Send Outgoing to a specific s

  - by user31869

  Is there any Mail Server which can accept all incoming message to a user and to a outgoing message should be sent to a particular usernames not to other accounts .

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• How do I stop someone from saturating my line & wasting CPU cycles

  - by JoshRibs

  My web host shows inbound & outbound traffic with mrtg. I have a steady 3.5mbps inbound traffic from Nigeria. Even assuming the source IPs & destination ports are blocked with Iptables & verifying nothing is listening on those ports, will the traffic still always pass through the switch & "get" to my server (where my server wastes CPU cycles "dropping" the packets)? Assuming I was setup with a hardware firewall, the traffic would still show in mrtg assuming the firewall is behind the switch? So is there any way to stop someone from saturating your 100mbps line, if they also have a 100mbps line? Other than filing an abuse complaint with the kind folks in Nigeria?

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• NFS host is not exporting the "share"

  - by user1345260

  I have a NFS Server: usanfsd01 And a remote machine: usafssd01 I tried mounting a directory from usafssd01 onto usanfsd01 by adding the following line to /etc/fstab as root usanfsdo1:/home/dblogs /home/data/dblogs nfs rw 0 0 And when I run the following command to see if NFS is exporting the share, it's not shown showmount -e usanfsdo1 Can someone please help? Also, a point of interest would be there is another mount that works on the same servers and thats defined as below in the /etc/fstab usanfsdo1:/home/files /home/data/files nfs rw 0 0 /etc/exports /nfs/home/dblogs 'IPADDRESS'(rw,no_root_squash)

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• Decrease in disk performance after partitioning and encryption, is this much of a drop normal?

  - by Biohazard

  I have a server that I only have remote access to. Earlier in the week I repartitioned the 2 disk raid as follows: Filesystem Size Used Avail Use% Mounted on /dev/mapper/sda1_crypt 363G 1.8G 343G 1% / tmpfs 2.0G 0 2.0G 0% /lib/init/rw udev 2.0G 140K 2.0G 1% /dev tmpfs 2.0G 0 2.0G 0% /dev/shm /dev/sda5 461M 26M 412M 6% /boot /dev/sda7 179G 8.6G 162G 6% /data The raid consists of 2 x 300gb SAS 15k disks. Prior to the changes I made, it was being used as a single unencrypted root parition and hdparm -t /dev/sda was giving readings around 240mb/s, which I still get if I do it now: /dev/sda: Timing buffered disk reads: 730 MB in 3.00 seconds = 243.06 MB/sec Since the repartition and encryption, I get the following on the separate partitions: Unencrypted /dev/sda7: /dev/sda7: Timing buffered disk reads: 540 MB in 3.00 seconds = 179.78 MB/sec Unencrypted /dev/sda5: /dev/sda5: Timing buffered disk reads: 476 MB in 2.55 seconds = 186.86 MB/sec Encrypted /dev/mapper/sda1_crypt: /dev/mapper/sda1_crypt: Timing buffered disk reads: 150 MB in 3.03 seconds = 49.54 MB/sec I expected a drop in performance on the encrypted partition, but not that much, but I didn't expect I would get a drop in performance on the other partitions at all. The other hardware in the server is: 2 x Quad Core Intel(R) Xeon(R) CPU E5405 @ 2.00GHz and 4gb RAM $ cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 32 Lun: 00 Vendor: DP Model: BACKPLANE Rev: 1.05 Type: Enclosure ANSI SCSI revision: 05 Host: scsi0 Channel: 02 Id: 00 Lun: 00 Vendor: DELL Model: PERC 6/i Rev: 1.11 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: HL-DT-ST Model: CD-ROM GCR-8240N Rev: 1.10 Type: CD-ROM ANSI SCSI revision: 05 I'm guessing this means the server has a PERC 6/i RAID controller? The encryption was done with default settings during debian 6 installation. I can't recall the exact specifics and am not sure how I go about finding them? Thanks

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• pdflush hanging on Amazon EBS drives when using multi-GB files - any workaround?

  - by rhh

  Hello, When I run gunzip on a 1.7GB file (which generates an 8GB file) on an EBS volume, pdflush freezes after gunzip runs and the CPU hangs indefinitely at 100% IO Wait. Here's the output from 'ps aux | grep pdflush'. Note the D status root 87 0.0 0.0 0 0 ? D 06:18 0:00 pdflush root 88 0.0 0.0 0 0 ? D 06:18 0:00 pdflush The only solution is to kill the pdflush processes. The processes don't die immediately either. This problem is repeatable and happens with new instances. I'm running 2xlarge instances and I have way more RAM free than is being used (i.e. /proc/meminfo shows 20+GB MemFree) Has anyone found a workaround to this problem in the past? Thanks for any thoughts. Robert

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• Best open source server notification software

  - by Adam Evers

  I am looking for an open source notification/monitoring software which will work much like growl does with a mac. It would be awesome if I could receive certain messages to my mac computer from my server when lets say it restarts or some predefined error happens etc. Anyone know of anything like that? I know of Nagios but I am thinking not as complex.

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• Is it inefficient to have symbolic links to symbolic links?

  - by Ogre Psalm33

  We're setting up a series of Makefiles where we want to have a project-level include directory that will have symbolic links to sub-project-level include files. Many sub-project developers have chosen to have their include files also be symbolic links to yet another directory where the actual software is located. So my question is, is it inefficient to have a symbolic link to a symbolic link to another file (for, say, a C++ header that may be included dozens or more times during a compile)? Example directory tree: /project/include/ x_header1.h -> /project/src/csci_x/include/header1.h x_header2.h -> /project/src/csci_x/include/header2.h /project/src/csci_x/ include/ header1.h -> /project/src/csci_x/local_1/cxx/header1.h header2.h -> /project/src/csci_x/local_2/cxx/header2.h local_1/cxx/ module1.cpp header1.h local_2/cxx/ module2.cpp header2.h

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• Migrating users and mailboxes from postfix / Maildir to Postfix with Mysql backend [closed]

  - by Chrispy

  Possible Duplicate: Migrating users and mailboxes from postfix / Maildir to Postfix with Mysql backend So I've got 60 or so users on a hand rolled postfix installation on openbsd and I'd like to move their mailboxes to our new mail server running iRedMail (postfix, vmail/mysql back end) Does anyone know of a good way to do this? Preferably a script I can run to keep syncing the users mailboxes as MX records get updated? I presume one way (though I don't have all their passwords!) would be to have a command line imap client that simulated the users copying their mail themselves but I'm sure there must be a shell / php script to migrate users? Anyone got any bright ideas? Chris.

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• nagios ldap-group based front end login permission issues

  - by Eleven-Two

  I want to grant users access to the nagios 3 core frontend by using an active directory group ("NagiosWebfrontend" in the code below). The login works fine like this: AuthType Basic AuthName "Nagios Access" AuthBasicProvider ldap AuthzLDAPAuthoritative on AuthLDAPURL "ldap://ip-address:389/OU=user-ou,DC=domain,DC=tld?sAMAccountName?sub?(objectClass=*)" AuthLDAPBindDN CN=LDAP-USER,OU=some-ou,DC=domain,DC=tld AuthLDAPBindPassword the_pass Require ldap-group CN=NagiosWebfrontend,OU=some-ou,DC=domain,DC=tld Unfortunately, every nagios page just shows "It appears as though you do not have permission to view information for any of the services you requested...". I got the hint, that I am missing a contact in nagios configuration which is equal to my login, but creating one with the same name as the domain user had no effect on this issue. However, it would be great to find a solution without manually editing nagios.conf for every new user, so the admins could grant access to nagios by just putting the user to "NagiosWebfrontend" group. What would be the best way to solve it?

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• Route eth0 to internet traffic and eth1 to local traffic

  - by Romain Caire

  How can I route all my internet traffic on eth0 (everything except 192.168.1.0/24) and route my local traffic through eth1 (192.168.1.0)? Here is my attempt : # Flush ALL THE THINGS. ip route flush table main # Restore the main table. I flushed it because OpenVPN does weird things to it. ip route add 127.0.0.0/8 via 127.0.0.1 dev lo ip route add 0.0.0.0/0 via 164.67.195.1 ip route add 192.168.1.0/24 via 192.168.1.1 ip route flush cache

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• deploy git project and permission issue

  - by nixer

  I have project hosted with gitolite on my own server, and I would like to deploy the whole project from gitolite bare repository to apache accessible place, by post-receive hook. I have next hook content echo "starting deploy..." WWW_ROOT="/var/www_virt.hosting/domain_name/htdocs/" GIT_WORK_TREE=$WWW_ROOT git checkout -f exec chmod -R 750 $WWW_ROOT exec chown -R www-data:www-data $WWW_ROOT echo "finished" hook can't be finished without any error message. chmod: changing permissions of `/var/www_virt.hosting/domain_name/file_name': Operation not permitted means that git has no enough right to make it. The git source path is /var/lib/gitolite/project.git/, which is owned by gitolite:gitolite And with this permissions redmine (been working under www-data user) can't achieve git repository to fetch all changes The whole project should be placed here: /var/www_virt.hosting/domain_name/htdocs/, which is owned by www-data:www-data. What changes I should do, to work properly post-receive hook in git, and redmine with repository ? what I did, is: # id www-data uid=33(www-data) gid=33(www-data) groups=33(www-data),119(gitolite) # id gitolite uid=110(gitolite) gid=119(gitolite) groups=119(gitolite),33(www-data) does not helped. I want to have no any problem to work apache (to view project), redmine to read source files for project (under git) and git (doing deploy to www-data accessible path) what should I do ?

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• nagiosgraph new services not showing

  - by Eleven-Two

  I am using Nagios Core with Nagiosgraph and had only enabled graphing for cpu usage for a while. This worked fine, but now i wanted to add some more services (for example memory usage). The new services are not working (no rrd data is generated). The Nagiosgraph site only says "no data available" and I get no error in apache log, nagiosgraph.log or nagiosgraph-cgi.log. The new services are standard services (nsclient++ MEMUSE for example) and of course they are included in the map file. If I execute the checks manually, it shows also the perfdata. I added the services by enabling the "graphed-service" use. Did I miss something?

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• Dealing with SMTP invalid command attack

  - by mark

  One of our semi-busy mail servers (sendmail) has had a lot of inbound connections over the past few days from hosts that are issuing garbage commands. In the past two days: incoming smtp connections with invalid commands from 39,000 unique IPs the IPs come from various ranges all over the world, not just a few networks that I can block the mail server serves users throughout north america, so I can't just block connections from unknown IPs sample bad commands: http://pastebin.com/4QUsaTXT I am not sure what someone is trying to accomplish with this attack, besides annoy me. any ideas what this is about, or how to effectively deal with it?

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• Web Server Users - Best Practice

  - by Toby

  I was wondering what is considered best practice when several developers/administrators require access to the same web server. Should there be one non-root user with a secure username and password unqiue to the web server which everyone logs in as or should there be a username for each person. I am leaning towards a username for each person to aid in logging etc however then does the same user keep the same credentials over several servers, or should at least their password change depending on the server they are on? Should any non-root user of the system be added to the sudoers file or is it best practice to leave everyone off it and only let root perform certain tasks? Any help would be greatly appreciated.

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• Web Server Users - Best Practice

  - by Toby

  I was wondering what is considered best practice when several developers/administrators require access to the same web server. Should there be one non-root user with a secure username and password unqiue to the web server which everyone logs in as or should there be a username for each person. I am leaning towards a username for each person to aid in logging etc however then does the same user keep the same credentials over several servers, or should at least their password change depending on the server they are on? Should any non-root user of the system be added to the sudoers file or is it best practice to leave everyone off it and only let root perform certain tasks? Any help would be greatly appreciated.

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• Combat server downtime by duplicating server and re-routing when main server is down

  - by Wasim

  I have a CentOS server which at times either crashes or gets attacked with DDOS. At the moment I have an off site backup which is filled up with 1.7TB of data. I'm currently paying as much for the backup as I am for the server and I was looking for advice from experienced people as to what option is best to proceed from here. Would it be a viable solution to ditch the offsite backup, and instead purchase an additional server which is an exact duplication of the first server. So if the first server is down, users are re-routed to the second server without noticing the first server is even down. This would create an automatic backup of the first server (albeit not offsite) and relinquish the need for the expensive offsite backup. Is the above solution a true solution to pricey backup or is offsite backup absolutely necessary? How would I go about doing this (obviously it's pretty complex so just links to some reading material or the terminology of the procedure would be great)? Appreciate the help and advice.

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• Do you know a script for email round trip monitoring?

  - by crazyfr

  Do you know a simple script that can do email round trip monitoring ? I want to monitor email service on A. I install the script on B. B sends an email to A A sends an auto-reply to B B knows that email service is working well. B restarts this test every 30min. If B didn't received replies, it sends an alert message. B could also monitor round-trip delay of emails. I have not access to the email service, I can only ask new end user email and configure auto-reply. B is an Ubuntu. Thanks!

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• How to restore default iPod playlists on Amarok?

  - by obvio171

  I wanted to "reset" the collection on my iPod and ended up accidentally deleting, through Amarok, all the playlists, including the default ones like "Most Played" and "Highest Rated". Since these are dynamic playlists with a special meaning for iPod, I don't think creating new, normal playlists with the same name will bring their special behavior back. How do I restore them with the same dynamic functionality? Is there a way to do that on Amarok? Rhythmbox? GTKPod? Command line? P.S.: not entirely sure what the policy about iPod questions are, but this one in particular seems to me to be very computer-related because, although it's about interfacing with a device, everything has to be done on my computer, using standard PC libraries/programs, etc. If it's still off-topic, please point me to where I could post it.

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• Ubuntu Connect Button Disabled, cannot connect

  - by CSharperWithJava

  I'm trying to connect to my school network from Ubuntu 12. The network is WPA encrypted and I can connect just fine if the network manager establishes a connection automatically. However, when I get disconnected and try to reconnect a username and password prompt pops up. The credentials are already stored and are autofilled in correctly, but the Connect button is disabled so I can't actually connect to the network. What can I do? The only guess I've found so far is the password is too short and Ubuntu is expecting a full WPA key. I don't administer the school network though so I certainly can't change that.

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• Trouble with apache starting on boot with ssl api key

  - by molleman

  Im Running on Centos, the trouble is when i restart my server i need to start my apache and varnish service I use this to start both of them service httpd restart && service varnish restart But i would likw both of them to start when i reboot the server I read i could use this chkconfig httpd on But this is only for apache could i do this chkconfig varnish on Finally when i do y usual start of httpd , i am asked for my api key for SSL , am i able to incorporate this into resarting both varnish and httpd on start up. Or am i doomed to run this command everytime i resart

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• clocksource tsc unstable

  - by amorfis

  Ok, now I have real server fault ;) After some time from booting (about one minute) my server hangs. All I can do is hard reset. Then after restart in /var/log/kern.log I can find: Jul 29 22:38:57 leonidas kernel: [ 90.729598] longhaul: Failed to set requested frequency! Jul 29 22:38:57 leonidas kernel: [ 90.731252] longhaul: Enabling "Ignore Revision ID" option. Jul 29 22:38:57 leonidas kernel: [ 91.201461] longhaul: Failed to set requested frequency! Jul 29 22:38:57 leonidas kernel: [ 91.201482] longhaul: Disabling ACPI C3 support. Jul 29 22:38:57 leonidas kernel: [ 91.204230] longhaul: Disabling "Ignore Revision ID" option. Jul 29 22:38:58 leonidas kernel: [ 91.416133] longhaul: Failed to set requested frequency! Jul 29 22:38:58 leonidas kernel: [ 91.416152] longhaul: Enabling "Ignore Revision ID" option. Jul 29 22:38:58 leonidas kernel: [ 91.960048] Clocksource tsc unstable (delta = -105611479 ns) I found some resources on the net, and it said to change clocksource, or disable ACPI. I tried disabling ACPI but it didn't help (but I noticed there was longer time before hanging). I can't change clock to hpet, because my system doesn't have such one. Output of cat /sys/devices/system/clocksource/clocksource0/available_clocksource: acpi_pm jiffies tsc My system is ubuntu server on VIA Epia hardware.

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• Random Server shutdown? - CentOS

  - by Kevin Hammett

  My system was working fine, and then it just had a random restart. Anyone have any idea of the problem? The message log: Jul 6 22:56:34 909I7 shutdown[719711]: shutting down for system halt Jul 6 22:56:34 909I7 init: Switching to runlevel: 0 Jul 6 22:56:35 909I7 smartd[10743]: smartd received signal 15: Terminated Jul 6 22:56:35 909I7 smartd[10743]: smartd is exiting (exit status 0) Jul 6 22:56:42 909I7 hcid[8749]: Got disconnected from the system message bus Jul 6 22:56:42 909I7 auditd[8430]: The audit daemon is exiting. Jul 6 22:56:42 909I7 kernel: audit(1341640602.922:344412): audit_pid=0 old=8430 by auid$ Jul 6 22:56:43 909I7 pcscd: pcscdaemon.c:572:signal_trap() Preparing for suicide Jul 6 22:56:43 909I7 pcscd: hotplug_libusb.c:376:HPRescanUsbBus() Hotplug stopped Jul 6 22:56:44 909I7 pcscd: readerfactory.c:1379:RFCleanupReaders() entering cleaning f$ Jul 6 22:56:44 909I7 pcscd: pcscdaemon.c:532:at_exit() cleaning /var/run Jul 6 22:56:44 909I7 kernel: Kernel logging (proc) stopped. Jul 6 22:56:44 909I7 kernel: Kernel log daemon terminating. Jul 6 22:56:45 909I7 exiting on signal 15

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• rsync --files-from (find + cat)

  - by Edward

  I try command rsync -v --files-from=/path/to/list.lst /home/user /path/to/backup list.lst contains for example .gnupg/ .pki/ .gnome2/keyrings/ .mozilla/firefox/*.default/bookmarkbackups/ .mozilla/firefox/*.default/bookmarks.html .mozilla/firefox/.default/.db files .mozilla/firefox/.default/.sqlite and i get error on all strings with * "failed: No such file or directory". Can anybody help me, or as variant can i combine find `cat /path/to/list.lst` with rsync?

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• How do you create virtual folders from saved search

  - by Jérôme Radix

  I would like to have on unix-like platforms, the same functionality as to Windows 7 Library folders (aka virtual folders) you see in Windows Explorer. Gnome Nautilus do that kind of virtual folders through saved search. But I want a system-wide solution, not a gnome-wide solution. Is there a tool that creates virtual folders from the concatenation of multiple search queries (the result of multiple find commands ?). The solution should index files for better performances and you should be able to define the default folder for copy operations. I assume the solution of this kind of problem certainly use FUSE, but I can't see a complete solution to this kind of task in FUSE applications.

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• Fastest reliable way to open the terminal?

  - by meder

  I actually had my SUPER_L ( left windows key ) binded to gnome-terminal, but for whatever reason ever since upgrading to 9.04 Ubuntu from 8.10 Intrepid it seemed to break the key binding. It was very handy because I could throw open the terminal with one key ( sorry but alt-f2 and typing gnome-terminal isn't practical for me ). Or perhaps it reset all the keybindings? I remember using xev and some gui type interface that was akin to Win32 registry editor. Anyway, I'm curious as to what you guys use to open the terminal.

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