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• Dell ServerAdmin SMNP settings with username/password

  - by Mr. Flibble

  Dell's OpenManager server admin tool can send email alerts, but the config for the SMNP server has no field to enter username/password. Can it only make use of non-authenticated SMNP servers, or is there a way to enter username and password as part of the server name?

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• Server with multiple IP addresses?

  - by RadiantHex

  Hi folks, just wondering how it is actually possible to have a server with multiple IPs I have a python script, and would like to be able to use different IP addresses for different requests. Is this actually possible? EDIT: I'm running CentOS 5 and have 3 IP Addresses asscociated with the machine

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• Tcpreplaying using VMware

  - by Methos

  This is more like a testbed setup question. I want to use VMware to debug some networking code in the linux kernel in the VM. My VM has two network interfaces. What I want to do is replay the capture file in the host and receive the packets in the VM. My problem is I do not see replayed packets in the VM. I am running VMware and tcpreplay on the host as sudo. Hence I think there should not be any problem access devices files. I am running VMware workstation 7.0 a. I first began with Custom networking as that provides option of creating your own virtual network name. I wrote /dev/vmnet3 and /dev/vmnet4 for the two interfaces respectively. However, after booting the guest, I did not see any of these interfaces or devices files (in /dev) created on the host. b. Then I tried 'Host Only', but that does not show what bridge/device file is associated with the interface. c. Finally I tried bridged networking mode. I see vmnet1, vmnet8 and vboxnet0 on the host. I have tcpreplayed the capture file on each of these interfaces, for all the above three cases. I tried to capture packets in the VM using "tcpdump -i any". However, I do not see any packets. Any ideas/pointers?

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• alias name in brocade

  - by wildchild

  how do i look for alias name using the WWN in brocade. Say i have created an alias "CentosNode2Port1" using switch show i get the WWN ,but how to look for the alias name. alishow (WWN) is not accepting. please help

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• Allow shell access from one ip only

  - by Master

  Is it possible to have root shell access from one particular ip only I am using centOS. i want that only one user can log in via shell from one ip only

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• How to redirect (or Alias) jump page with Apache

  - by Meltemi

  I'm not an Apache expert but need to make a small change to a web server. We are introducing a "jump page" URL that is different from a primary URL (for tracking reasons). /productA/index.html /productA/jump_index.html Basically i want to log that jump_index.html was requested and then return index.html. I don't want the client to wait 8 seconds or so for a redirect. How should we be handling this? Simply symlink (or alias) the file in the filesystem? Use mod_alias Alias Match (if so how exactly)? something better still?

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• What is good book for administration & configuration of Storage logical arrays?

  - by unknown (yahoo)

  I am looking for a book which can explain pros and cons of different combination of configurations/policies of storage Arrays and may also suggest some best practices for certain scenarios for e.g. when data availability & security is very important. There are a lot of "books for dummy" but they don't go in depth, I am a more of developer so I would like to understand how and why exactly it works beneath policies & configuration settings. I am working with EMC clarion logical array but I will have to work with EMC Symmetrix or NetApp or any other types of disk arrays.

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• Running a defect php file cause error 500

  - by John Brunner

  When I address a PHP file, I always get an error 500. I've looked up the logs of my Apache server, and this displays that some includes etc. in the PHP file address files which don't exist on the server. They don't exist because I'm just testing my PHP file. But could it be achieved that the server runs the php file in every case, even when something is wrong? Every 30 seconds an entry is made in the error_log file which says [Sat Jun 09 17:55:07 2012] [error] [client 10.224.55.160] File does not exist: /var/www/html/index.html ... but there IS an index.html?!

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• Install problems with XSendFile on Ubuntu

  - by Dan

  I installed the apache dev headers: sudo apt-get install apache2-prefork-dev Downloaded and compiled the module as outlined here: http://tn123.ath.cx/mod_xsendfile/ Added the following line to /etc/apache2/mods-available/xsendfile.load: LoadModule xsendfile_module /usr/lib/apache2/modules/mod_xsendfile.so Added this to my VirtualHost: <VirtualHost *:80> XSendFile on XSendFilePath /path/to/protected/files/ Enabled the module by doing: sudo a2enmod xsendfile Then I restarted Apache. Then this code still just provides me with an empty file with 0 bytes: file_path = '/path/to/protected/files/some_file.zip' file_name = 'some_file.zip' response = HttpResponse('', mimetype='application/zip') response['Content-Disposition'] = 'attachment; filename=%s' % smart_str(file_name) response['X-Sendfile'] = smart_str(file_path) return response And there is not in the Apache error log that pertains to XSendFile. What am I doing wrong?

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• Yum install problem on netsolvps server

  - by Thomas

  I tried to install yum based on http://www.wallpaperama.com/forums/how-to-install-yum-problems-installing-on-linux-redhat-fedora-commands-t471.html. my current python is 2.4.6, red hot fedora core 6, 4.1.1-28, RPM 4.4.2. I tried with the yum 3.0.1 version for my current server configuration. There is no configure file on 3.0.1 so i used make install command. All files complied without error. If I run #rpm -q yum it says "package yum is not installed". Whats the problem here on the yum installation?

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• Giving PHP the permission to make a git pull request

  - by Bernd

  Hello, I would like to allow PHP to execute a Git pull command. But there are some problems with the user and permissions. How did you solve the problem? PHP runs as user www-data. Therefore I've changed the .git directory owner/group to www-data (chown www-data:www-data -R .git). As it is turned out later www-data has no SSH keys. Is it a good idea to give it one? If yes where to place? Or is it possible to allow it to use a specific key. Best regards, Bernd

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• Limit download usage for clients

  - by Kumar P

  i am maintaining few windows xp machines under rhel 5 . i want to set quota for download file size. How to do it ? I mean, in lan usar A's maximum donload file size is 300 MB , and user B's maximum download file size in 200 MB. I want to block downloading when user try to download more than 300 MB file.User should not allow to download 300MB file at a time. Or how to set quota for maximum download per day, is there possible to do it ? How can i do this ?

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• File auditing software for Windows Server 2003

  - by David Collantes

  I am looking for a program or program suite that will allow the auditing of network shared resources (specifically storage space), and render reports (who created, deleted, moved, modified files, etc). Yes, I know I can turn on auditing on Windows, but the Event Log isn't quite the "charmer" for the job.

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• how to grep out a particular line from a file

  - by Omnipresent

  How can I grep out a particular line from a file in a folder. Basically I have a folder /my/cool/folder/myfile.txt I know it has line: I am cool lkasjdfaksldfj How can I grep on that file so the line starting with I am cool .... shows on the terminal?

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• iptables, blocking large numbers of IP Addresses

  - by Twirrim

  I'm looking to block IP addresses in a relatively automated fashion if they look to be 'screen scraping' content from websites that we host. In the past this was achieved by some ingenious perl scripts and OpenBSD's pf. pf is great in that you can provide it nice tables of IP addresses and it will efficiently handle blocking based on them. However for various reasons (before my time) they made the decision to switch to CentOS. iptables doesn't natively provide the ability to block large numbers of addresses (I'm told it wasn't unusual to be blocking 5000+), and I'm a bit cautious over adding that many rules into an iptable. ipt_recent would be awesome for doing this, plus it provides a lot of flexibility for just severely slowing down access, but there is a bug in the CentOS kernel that is stopping me from using it (reported, but awaiting fix). Using ipset would entail compiling a more up-to-date version of iptables than comes with CentOS which whilst I'm perfectly capable of doing it, I'd rather not do from a patching, security and consistency perspective. Other than those two it looks like nfblock is a reasonable alternative. Is anyone aware of other ways of achieving this? Are my concerns about several thousand IP addresses in iptables as individual rules unfounded?

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• Access denied error 3221225578 with file sharing to Windows server

  - by Ian Boyd

  i'm trying to access the shares on a server. The credential box appears, and i enter in a correct username and password, and i get access denied. The silly thing is that i can Remote Desktop to the server (using the same credentials), and i can check the Security event log for the access denied errors: Event Type: Failure Audit Event Source: Security Event Category: Account Logon Event ID: 681 Date: 3/19/2011 Time: 11:54:39 PM User: NT AUTHORITY\SYSTEM Computer: STALWART Description: The logon to account: Administrator by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 from workstation: HARPAX failed. The error code was: 3221225578 and Event Type: Failure Audit Event Source: Security Event Category: Logon/Logoff Event ID: 529 Date: 3/19/2011 Time: 11:54:39 PM User: NT AUTHORITY\SYSTEM Computer: STALWART Description: Logon Failure: Reason: Unknown user name or bad password User Name: Administrator Domain: stalwart Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: HARPAX Looking up the error code (3221225578), i get an article on Technet: Audit Account Logon Events By Randy Franklin Smith ... Table 1 - Error Codes for Event ID 681 Error Code Reason for Logon Failure 3221225578 The username is correct, but the password is wrong. Which would seem to indicate that the username is correct, but the password is wrong. i've tried the password many times, uppercase, lowercase, on different user accounts, with and without prefixing the username with servername\username. What gives that i cannot access the server over file sharing, but i can access it over RDP?

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• Apache2 & .htaccess : Apache ignoring AccessFile

  - by Elyx0

  Hi there here is my server configuration: DEBIAN 32Bits / PHP 5 / Apache Server version: Apache/2.2.3 - Server built: Mar 22 2008 09:29:10 The AccessFiles : grep -ni AccessFileName * apache2.conf:134:AccessFileName .htaccess apache2.conf:667:AccessFileName .httpdoverride All the AllowOverride statements in my apache2/ folder. mods-available/userdir.conf:6: AllowOverride Indexes AuthConfig Limit mods-available/userdir.conf:16: AllowOverride FileInfo AuthConfig Limit mods-enabled/userdir.conf:6: AllowOverride Indexes AuthConfig Limit mods-enabled/userdir.conf:16: AllowOverride FileInfo AuthConfig Limit sites-enabled/default:8: AllowOverride All sites-enabled/default:14: AllowOverride All sites-enabled/default:19: AllowOverride All sites-enabled/default:24: AllowOverride All sites-enabled/default:42: AllowOverride All The sites-enabled/default file : 1 <VirtualHost *> 2 ServerAdmin [email protected] 3 ServerName mysite.com 4 ServerAlias mysite.com 5 DocumentRoot /var/www/mysite.com/ 6 <Directory /> 7 Options FollowSymLinks 8 AllowOverride All 9 Order Deny,Allow 10 Deny from all 11 </Directory> 12 <Directory /var/www/mysite.com/> 13 Options Indexes FollowSymLinks MultiViews 14 AllowOverride All 15 Order allow,deny 16 allow from all 17 </Directory> 18 <Directory /var/www/mysite.com/test/> 19 AllowOverride All 20 </Directory> 21 22 ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ 23 <Directory "/usr/lib/cgi-bin"> 24 AllowOverride All 25 Options ExecCGI -MultiViews +SymLinksIfOwnerMatch 26 Order allow,deny 27 Allow from all 28 </Directory> 29 30 ErrorLog /var/log/apache2/error.log 31 32 # Possible values include: debug, info, notice, warn, error, crit, 33 # alert, emerg. 34 LogLevel warn 35 36 CustomLog /var/log/apache2/access.log combined 37 ServerSignature Off 38 39 Alias /doc/ "/usr/share/doc/" 40 <Directory "/usr/share/doc/"> 41 Options Indexes MultiViews FollowSymLinks 42 AllowOverride All 43 Order deny,allow 44 Deny from all 45 Allow from 127.0.0.0/255.0.0.0 ::1/128 46 </Directory> 47 48 49 50 51 52 53 54 </VirtualHost> If i change any Allow from all in Deny from all , it works whenever i put it. I've got one .htaccess at /mysite.com/.htaccess & one at /mysite.com/test/.htaccess with: Order Deny,Allow Deny from all Neither of them work i can still see my website. I've got mod_rewrite enabled but i don't think it does anything here. I've tried almost everything :/ It works on my local environnement (MAMP) but fails when on my Debian server.

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• sendmail is using return-path instead of from address

  - by magd1

  I have a customer that is complaining about emails marked as spam. I'm looking at the header. It shows the correct From: [email protected] However, it doesn't like the return-path. Return-Path: <[email protected]> Received-SPF: neutral (google.com: x.x.x.x is neither permitted nor denied by domain of [email protected]) client-ip=x.x.x.x; Authentication-Results: mx.google.com; spf=neutral (google.com: x.x.x.x is neither permitted nor denied by domain of [email protected]) [email protected] How do I configure sendmail to use the From address for the Return-Path?

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• no mails routed to/from new Exchange 2010

  - by Michael

  I have an Exchange Server 2003 up and running for years. Now I am in the mid of transition to Exchange Server 2010, I already installed it, put the latest Servicepack on it and everything seems fine, BUT: Mails do not get delivered to MailBoxes on the new Exchange 2010. e.g. when I create a new mailbox on the old server, Emails in and out to/from it work like a charm. But as soon as I move it to the new server, emails get stuck. Noe delivered from outside or old mailboxes, not send out from the new server to enywhere. Sending between Mailboxes on the new Server of course is working. I can see the connectors between old and new Server in the Exchange 2003 Admin Tool, but I cannot find these nowhere on the new server. I have also setup sending connectors at the new server to send out mails directly, but that does not work. In all other areas, the servers are perfectly working together - moving mailboxes between, seeing each other etc. "just" they dont exchange (!) any emails - Any ideas what I missed? I also followed the hints from: Upgrading from Exchange 2003 to Exchange 2010, routing works in one direction only There Emails were transported at least in one direction, in my case they are not transported at all. Both my connectors are up and valid abd have the correct source/target shown on Get-RoutingGroupConnector | FL Kind regards Michael

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• PLESK PostFix Error Local in maillog, how to troubleshoot

  - by RCNeil

  I'm using the PHP mail() function, using PostFix, on CentOS6, Plesk 10.4, and my email is not getting delivered to a particular address. My personal GMail and Yahoo email addresses receive email from my server fine and do not produce errors. After a wonderful suggestion on here, I checked my mail logs, and this is the error I see : Apr 10 10:26:29 ######### postfix/qmgr[8323]: 19EA21827: from= <[email protected]>, size=645, nrcpt=1 (queue active) Apr 10 10:26:29 ######### postfix-local[8331]: postfix-local: [email protected], [email protected], dirname=/var/qmail/mailnames Apr 10 10:26:29 ######### postfix-local[8331]: cannot chdir to mailname dir name: No such file or directory Apr 10 10:26:29 ######### postfix-local[8331]: Unknown user: [email protected] Apr 10 10:26:29 ######### postfix/pipe[8330]: 19EA21827: to=<[email protected]>, relay=plesk_virtual, delay=0.15, delays=0.11/0/0/0.04, dsn=2.0.0, status=sent (delivered via plesk_virtual service) Apr 10 10:26:29 ######### postfix/qmgr[8323]: 19EA21827: removed [email protected] is the name I've declared in php.ini for sendmail_from = "[email protected]" sendmail_path = "/usr/sbin/sendmail -t -f [email protected]" and the recipient is supposed to be [email protected]. Is this an error on my side or the recipients? Can I address this on my server? Many thanks SF.

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• NVIDIA Tesla K20C in Dell PowerEdge R720xd --- power cables

  - by CptSupermrkt

  I am trying to put an NVIDIA Tesla K20C into a Dell PowerEdge R720xd. I'm having a bit of trouble understanding the power requirements of the card. First, here is a picture of two pages of the same manual, which seems contradictory to me. One page says only a single connector is required, while the next page says both are required. The entire manual for the card can be found here: http://www.nvidia.com/content/PDF/kepler/Tesla-K20-Active-BD-06499-001-v02.pdf Here is an photo taken of the power connections on the card: And here is a photo of where those connectors need to go, onto the PCI-E riser of the r720xd: Neither the R720xd NOR the GPU came with the necessary cables. And given what appears to be a contradiction in the GPU manual (above), I'm not even sure at this point what we actually need. I have searched high and low online for things like 2x6 pin PCI-E to 8 pin male-to-male and so on, and for the life of me cannot find what we need. In case anyone needs it, the owner's manual of the R720xd can be found here: ftp://ftp.dell.com/Manuals/all-products/esuprt_ser_stor_net/esuprt_poweredge/poweredge-r720xd_Owner%27s%20Manual_en-us.pdf The relevant page is page 68, which clearly indicates that the 8-pin female port on the riser card is for a GPU. The bottom line question: exactly what power cables do we need to buy, and where can we find them?

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• Access Bind9 DNS in Virtualbox on Host

  - by Philipp Melab

  I've set up a Ubuntu 10.04 Virtual Box with a Bind9 DNS server. The Box has a NAT Network connection for internet access and a host-only adapter for static ip connections from the host (OSX Lion). Thats the only way i managed to get internet and static ip inside the box, guess there is a better one ... The DNS works fine from inside the virtualbox, but not from the host. The http and ftp on the guest system is accessible via both addresses, so connection between host and guest are fine i guess. I tried to add both IP's as name servers. I'm completely new to Bind9 and DNS configuration. Anybody has a hint for me whats wrong? Or how i have to configure the DNS server?

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• How to stop Apache from crashing my entire server?

  - by CyberShadow

  I maintain a Gentoo server with a few services, including Apache. It's fairly low-end (2GB of RAM and a low-end CPU with 2 cores). My problem is that, despite my best efforts, an over-loaded Apache crashes the entire server. In fact, at this point I'm close to being convinced that Linux is a horrible operating system that isn't worth anyone's time looking for stability under load. Things I tried: Adjusting oom_adj for the root Apache process (and thus all its children). That had close to no effect. When Apache was overloaded it would bring the system to a grind, as the system paged out everything else before it got to kill anything. Turning off swap. Didn't help, it would unload memory paged to binaries of processes and other files on /, thus causing the same effect. Putting it in a memory-limited cgroup (limited to 512 MB of RAM, 1/4th of the total). This "worked", at least in my own stress tests - except the server keeps crashing under load (basically stalling all other processes, inaccessible via SSH, etc.) Running it with idle I/O priority. This wasn't a very good idea in the end, because it just caused the system load to climb indefinitely (into the thousands) with almost no visible effect - until you tried to access an unbuffered part of the disk. This caused the task to freeze. (So much for good I/O scheduling, eh?) Limiting the number of concurrent connections to Apache. Setting the number too low caused web sites to become unresponsive due to most slots being occupied with long requests (file downloads). I tried various Apache MPMs without much success (prefork, event, itk). Switching from prefork/event+php-cgi+suphp to itk+mod_php. This improved performance, but didn't solve the actual problem. Switching I/O schedulers (cfq to deadline). Just to stress this out: I don't care if Apache itself goes down under load, I just want the rest of my system to remain stable. Of course, having Apache recover quickly after a brief period of intensive load would be great to have, but one step at a time. Right now I am mostly dumbfounded by how can humanity, in this day and age, design an operating system where such a seemingly simple task (don't allow one system component to crash the entire system) seems practically impossible - or at least, very hard to do. Please don't suggest things like VMs or "BUY MORE RAM". Some more information gathered with a friend's help: The processes hang when the cgroup oom killer is invoked. Here's the call trace: [<ffffffff8104b94b>] ? prepare_to_wait+0x70/0x7b [<ffffffff810a9c73>] mem_cgroup_handle_oom+0xdf/0x180 [<ffffffff810a9559>] ? memcg_oom_wake_function+0x0/0x6d [<ffffffff810aa041>] __mem_cgroup_try_charge+0x32d/0x478 [<ffffffff810aac67>] mem_cgroup_charge_common+0x48/0x73 [<ffffffff81081c98>] ? __lru_cache_add+0x60/0x62 [<ffffffff810aadc3>] mem_cgroup_newpage_charge+0x3b/0x4a [<ffffffff8108ec38>] handle_mm_fault+0x305/0x8cf [<ffffffff813c6276>] ? schedule+0x6ae/0x6fb [<ffffffff8101f568>] do_page_fault+0x214/0x22b [<ffffffff813c7e1f>] page_fault+0x1f/0x30 At this point, the apache memory cgroup is practically deadlocked, and burning CPU in syscalls (all with the above call trace). This seems like a problem in the cgroup implementation...

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• Giving PHP the permission to make a git pull request

  - by Bernd

  I would like to allow PHP to execute a Git pull command. But there are some problems with the user and permissions. How did you solve the problem? PHP runs as user www-data. Therefore I've changed the .git directory owner/group to www-data (chown www-data:www-data -R .git). As it is turned out later www-data has no SSH keys. Is it a good idea to give it one? If yes where to place? Or is it possible to allow it to use a specific key. Best regards, Bernd

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• OpenBSD in a virtual box as a firewall

  - by Ali

  Is there any merit in installing a virtual machine with OpenBSD and pf (or any other simple and secure OS + iptable) on a mac laptop and routing all the traffic through that machine? I read a similar set up for corporate laptops running windows (I thing I read this in BSD magazine). They claim that Windows machines are too hard to secure and if you are taking them to the wild (public wireless, hotels, ...) you'd better but a secure OS in between! If you think this is a good idea, how you route all the traffic on a mac through the virtual machine and prevent any application or service to go directly? I am not sure if just setting the gateway will do that, what about DNS? you don't want anybody to fool you with DNS cache poisoning or similar attacks either.

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