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• CentOS, YUM Errors?

  - by mike

  Hi, I am using a Media Temple DV server with CentOS upon trying to install ImageMagick via yum, I get the following error: There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: /usr/lib/python2.4/site-packages/rpm/_rpmmodule.so: undefined symbol: rpmdbCheckTerminate Please install a package which provides this module, or verify that the module is installed correctly. It's possible that the above module doesn't match the current version of Python, which is: 2.4.3 (#1, May 24 2008, 13:47:28) [GCC 4.1.2 20070626 (Red Hat 4.1.2-14)] Can anyone shed some light on what I might be able to do to fix this? Thanks!

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• LDAP Authentication for multiple AD Domains

  - by TrevJen

  I have 3 full trust domains (2 child and one root). I need to use LDAP to allow authntication for domain users. The trick is that I need the application to use an AD server for the child domain BUT proxy the LDAP query and authentication for the root domain. I see that it maty be possible with AD LDS and some trusts and synching, but it looks pretty hairy and overly complicated. The short of it is: 3 domains (Parent, ChildA, ChildB) My 3rd party app will need to use ChildA domain servers to authenticate either: a. a user in the parent domain or b. a user in the ChildB domain I already have full trusts between all domains, and regular NTLM authentication works fine (unless you are trying to authenticate with LDAP)

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• Troubleshooting MySQL : can connect to localhost but not to 127.0.0.1 or IP

  - by mireille raad

  Hello, I'd appreciate some help on this, it is bit tricky to find the correct keywords to google :) Using PHP i am able to connect using the following connection string : $link = mysql_connect('localhost', 'wlek' , 'wlek'); but when i use 127.0.0.1 or 10.10.40.15 (self-IP), i am getting connection failed Could not connect: Can't connect to MySQL server on '10.10.40.15' (13) I used yum install mysql , yum install php yum install php-mysql 1 - is there anything more i should install for php ? 2 - any troubleshooting tips ? 3 - what keywords, links do u recommend | % | mir | xdb | | 10.10.40.15 | mir | xdb | | localhost | mir | xdb | [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql port=3306 bind-address=0.0.0.0 old_passwords=1 [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid ~ appreciate it :)

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• ssh port forwarding / security risk

  - by jcooper

  Hi there, I want to access a web application running on a web server behind my office firewall from an external machine. We have a bastion host running sshd that is accessible from the Internet. I want to know if this solution is a bad idea: Create an account on the bastion host with shell=/bin/false and no password ('testuser') Create a ssh RSA key on the external machine Add the public RSA key to the testuser's authorized_keys file ssh to the bastion host from the external host using: ssh -N 8888:targethost:80 run my tests from the external host shut down the ssh tunnel I understand that if my RSA private key were compromised then someone could ssh to the bastion host. But are there other reasons this solution is a bad idea? thank you!

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• net use mapping not working in batch files but works in cmd

  - by Philippe

  Ok so here's the problem : I've got users using logon script in the domain (username.bat). The script simply lists 4 or 5 (net use letter: \\SERVER\directory\). However, when they open their session, the logon script doesnt work and returns system error 53 or 67 for all of them. I tried running the script after the profile has loaded and evrything is running, and it still gives me the error. I've then tried to run the same command in the cmd.exe. Everything mapped correctly. It also works fine if I map the drives using the "Tools Map network drives" utility. Is there anything that can prevent a command to work when ran in a batch-file but works correctly when typed in manually?

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• Virtualized CPU cores vs. threads

  - by nedm

  We've got a KVM host system on Ubuntu 9.10 with a newer Quad-core Xeon CPU with hyperthreading. As detailed on Intel's product page, the processor has 4 cores but 8 threads. /proc/cpuinfo and htop both list 8 processors, though each one states 4 cores in cpuinfo. KVM/QEMU also reports 8 VCPUs available to assign to guests. My question is when I'm allocating VCPUs to VM guests, should I allocate per-core or per-thread? Since KVM/QEMU reports the server has 8 VCPUs to allocate, should I go ahead and set a guest to use 4 CPUs where I previously would have set it to use 2 (assuming 4 total VCPUs available)? I'd like to get the most possible out of the host hardware without over-allocating.

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• Apache whitelist a single location, but require basic auth for everything else

  - by Chris Lawlor

  I'm sure this is simple, but Google is not my friend this morning. The goal is: /public... is openly accessible everything else (including /) requires basic auth. This is a WSGI app, with a single WSGI script (it's a django site, if that matters..) I have this: <Location /public> Order deny,allow Allow from all </Location> <Directory /> AuthType Basic AuthName "My Test Server" AuthUserFile /path/to/.htpasswd Require valid-user </Directory> With this configuration, basic auth works fine, but the Location directive is totally ignored. I'm not surprised, as according to this (see How the Sections are Merged), the Directory directive is processed first. I'm sure I'm missing something, but since Directory applies to a filesystem location, and I really only have the one Directory at /, and it's a Location that I wish to allow access to, but Directory always overrides Location... EDIT I'm using Apache 2.2, which doesn't support AuthType None.

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• Postfix dynamic smtp_helo_name

  - by William

  I have a mail server that relays e-mails for two different domains. I want the smtp_helo_name to be different based on the domain. I'm assuming there is no way to do this via checking the mail headers, so I was wondering if there was a way to do it by sending mail for one domain to one IP, and mail for the other to another. I tried modified master.cf to do this: localhost:smtp inet n - n - - smtpd ip1:smtp inet n - n - - smtpd ip2:smtp inet n - n - - smtpd -o myhostnamee=example2.com And setting smtp_helo_name to $myhostname in main.cf I also tried doing -o smtp_helo_name instead, neither work. Any suggestions would be great. Thanks

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• What are the "must " security tools for small organizations ?

  - by Berkay

  One of my friend has started a company, it's a small-scale company that has a 40 workers.There is two guys also responsible for the security and IT related issues.He is managing the LAN, Webpage of the company, e-mail configuration, printer hardware modification, application deployment etc. In this point, to provide the security measures including access controls, authentication, web server security etc. Which tools do you use for securing, monitoring and controlling the system ? Are you paying for these tools or are they open source? This question is due to the security administrators requests to my friend.He offers to get some tools for the company and my friend hesitates to pay that much on them (what he mentioned me.)

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• How to check sshd log?

  - by Eye of Hell

  Hello. I have Ubuntu 9.10 installed with sshd and i can successfully connect to it using login and password. I have configured an RSA key login and now have "Server refused our key" as expected. Ok, now i want to check sshd log in order to fingure out a problem. I have examined /etc/ssh/sshd_config and it have SyslogFacility AUTH LogLevel INFO Ok. I'm looking at /var/log/auth.log and... it's empty O_O. Changing Loglevel to VERBOSE helps nothing - auth.log is still empty. Any hints how i can check sshd log?

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• Can't see attachments in OWA but can in Outlook

  - by johnny

  Hi, I have several users, including myself, that cannot see attached images (.jpg) in OWA. I can see them in Outlook but in OWA the attachments, the link to see them, are not included. I see the line for attachments in the message. But it's just empty. I have other messages that have been sent to me from outside of the domain and I can see them. Just not internally sent ones. Was hoping for help. Thank you. I did not see anything in the file levels of the registry to prohibit .jpg files. Exchange 2003 Server, Outlook 2003, OWA for 2003.

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• please demystify the 10Gb ethernet interfaces, cables

  - by maruti

  this really is a Dell question but tempted to ask the experts @ serverfault. choosen a Dell powerconnect 8024 10GbE switch. per the spec sheet this has 10GbaseT ports. "24x 10GBASE-T (10Gb/1Gb/100Mb) with 4x Combo Ports of SFP+ (10Gb/1Gb) or 10GBASE-T" the HBA on my storage server has 10G CX4 copper ports Dell does not sell any cables and this adds to my confusion. from the picture Dell 8024 seems to have RJ-45 type ports on the front panel? my question: is it a RJ-45 + CX4 cable or CX4 + CX4 cable?

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• Linux EC2 Instance Security Consideration

  - by Amzath

  I am going to host a web site in Amazon EC2 instance which would be a Linux instance. My web application will be developed using PHP, Apache and MySql. As I am new to Linux and Amazon EC2 environment, what are key areas in security should I consider to protect my server? This may be very very generic question as the security itself a vast area. But I need to kick start with most imporant points. That way I would be able to track down all those areas one by one.

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• NFSv3 Asynchronous Write Depends on Block Size?

  - by Joe Swanson

  I am trying to figure out if my NFSv3 deployment is performing SAFE asynchronous writes. I suspect that it is doing strictly synchronous writes, as I am getting poor performance in general. I used Wireshark to look at the 'stable' flag in write calls, and look for 'commit' calls. I noticed that, with especially large block sizes, writes to appear to be performed asynchronously: dd if=/dev/zero of=/proj/re3/0/zero bs=2097152 count=512 However, smaller block sizes appear to be performed strictly synchronously: dd if=/dev/zero of=/proj/re3/0/zero bs=8192 count=655360 What gives? How does the client decide whether to tell the server to perform writes synchronously or asynchronously? Is there any way I can get smaller block sizes to be performed asynchronously?

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• Choosing a low cost wildcard SSL cert (PsotiveSSL, RapidSSL, or other)?

  - by Malcolm

  I'm looking to put in place a wildcard SSL certificate for a server that will be providing REST style web services to multiple subdomains. We use NameCheap.com for our DNS services and they offer a choice of 2 very competitively priced wildcard certs: PositiveSSL Wildcard $129.99/yr RapidSSL Wildcard $148.88/yr Is there any reason to choose one of these branded certs over the other? Or are there problems with these low cost certs that we should aware of? If so, what SSL vendor/products do you recommend and why do you recommend them? Thank you, Malcolm

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• http proxy caching headers

  - by David Hagan

  I have a service for which I'm about to upgrade the authentication. However, I'm trying to ensure that I make the right decision about where the encryption algorithms occur. I currently have two options: option 1) the authentication module is deployed to the client as a javascript library over https and executes client-side, so that the client can POST back an encrypted string. option 2) the authentication module is kept server-side so that the client need only POST back an unencrypted string. I know that many http proxies cache/log the query-string (and therefore any query parameters), but does anyone know of any http proxies that cache the headers as well? If the headers are being cached, then I'll clearly want to encrypt the password inside the SSL encryption, because to my understanding the headers of an HTTPS request may not always be encrypted (depending on the capabilities of the browser etcetera). Can anyone shed any light on the caching of headers by http proxies? Do you have one that does, or know of one that does?

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• A specific user is unable to log in to vsftpd

  - by HackToHell

  I am setting up a new user let his name be ftpguy. He has access to only one directory /var/www/xxx. I have already chowned the directory so that he has write and read privileges. The user is also unable to login via ssh as I have disabled that by changing his shell to /sbin/nologin. Also, in vsftpd config, I have enabled the chroot_local_user. Now whenever I log in from ftp, i get an auth error. Connect socket #1008 to xxxxxxxx, port 21... 220 Welcome to blah FTP service. USER ftpguy 331 Please specify the password. PASS ********** 530 Login incorrect. I changed the password to something different several times, using the passwd command, nothing happens, i still the above error. However I am able to log in with my ssh creditals to my ftp server without any problems.(I do not use a key).

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• Graphing services using pnp4nagios

  - by Matias

  Hi! I've managed to install pnp4nagios 0.6.3 and I'm a bit confused about how pnp4nagios generates graphics. Almost out of the box, it started graphs for ping and some http servers (not all of them). But, how can I make it graph things like disk utilization (When that value comes from SNMP)?? For example, ls /usr/local/pnp4nagios/var/perfdata/isis/ Cola_de_Mail.rrd Cola_de_Mail.xml HTTP.rrd HTTP.xml PING.rrd PING.xml Those are checks running on the host isis, but there are many other checks for that server that are not taken into account by pnp4nagios. How can I make pnp4nagios "see" the other checks?? Thanks!

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• Broadcom BCM5716 Hangs on CentOS 6 Boot

  - by someotherguy

  I have a fresh CentOS 6 installation on a Dell R310 server with a Broadcom BCM5716. The onboard NIC is causing the boot to hang for some reason. Welcome to CentOS Linux Starting udev: udev: starting version 147 Boardcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.0.23b (Feb 01, 2011) bnx2 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 That's it... then it just hangs / freezes. If I disable the NIC via the BIOS settings, CentOS boots fine. I've downloaded and installed the latest driver from Broadcom's website. Any ideas?

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• Where is the best location to keep shared-developer website files in the linux hierarchy?

  - by Tchalvak

  I just started hosting files for a website on my server, and I'm not sure where is an appropriate place to keep them. At the moment, I have them in /var/www/name.of.virtualhost.site/www/. That's obviously not secure because anything below the final public /www/ folder is also available since the /var/www/ contents are already being served up. For example, /var/www/name.of.virtualhost.site/docs/site_policies.txt is accessible via something like defaultsite.com/name.of.virtualhost.site/docs/site_policies.txt. So where is a good place to store the files that make up a website? (when it's a site that only I'm developing, I can obviously just stick them in /home/my_username/sites/name.of.virtualhost.site/, but that doesn't work well when I want other developers to be working on the site's files as well) I'm running a LAMP stack, not that I expect it to matter.

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• Recover from a corrupted couchbase install

  - by jcolebrand

  We have a couchbase installation on a Windows 2008 R2 server that got corrupted (this was from before my tenure, now I want to clean it up). There is no add-remove entry in the Programs and Features list. There is no active service in services.msc. However, something still thinks Couchbase is installed. Shy of wiping the box (we aren't quite to "redeploy test environment servers at the push of a button" altho I'm working on it), how can I ensure that all remnants of couchbase installs prior are now gone? I believe the previous install was in the Couchbase 2.x range, but it may have been 1.7+ Running the installer again gives "Installer needs to update registry value in order to upgrade from the previous version. Please run installer again to continue."

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• asp.net mvc 2 web application inside a Web site?

  - by Amitabh

  I have a Asp.Net Web Site deployed as a WebSite inside IIS 7.5. http://localhost/WebSite Then I have a second Asp.Net MVC 2 web application which is deployed as Sub Application inside the above WebSite. So the mvc aplication should work on the following Url. http://localhost/WebSite/MvcApp/ The web site works fine but when I browse the mvc Url http://localhost/WebSite/MvcApp/ It gives following error. HTTP Error 403.14 - Forbidden The Web server is configured to not list the contents of this directory.

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• Copy Network Volume configuration among Linux systems

  - by David Yu

  I have several standalone Debian Linux (Lenny) systems. As it stands now, all of the systems are configured with a generic login account. This login account has a network volume that connects to a Windows share on a Windows server. I need to create a batch of user accounts on all of the systems (this part I figured out). After I create all of the user accounts, I need all of them to have the same network volume mapping as the current generic account. Is the network volume configuration saved somewhere, where I could copy that configuration across all of the user accounts?

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• Backup Exec 12.5 or 2010? [closed]

  - by Chris Thorpe

  Backup Exec 2010 has just dropped, and I'm about to implement a new BEWS infrastructure, complete with CALs and new central servers. When I specced this up last year, I ignored 2010 and focused on Backup Exec 12.5, since it's a mature product. In previous experience, major released of BE had numerous technical issues and seemed to improve significantly at the first service pack. However, our refresh cycle on the backup infrastructure is slow, the main driver usually being lack of support for some new server type (in this case, ESX has driven our current upgrade need). With this in mind, I'm wondering if Backup Exec 2010 should be my first choice, as it'll last longer under current support than 12.5, which will approach EOL soon. Has anyone got any perspective they could add to this? Right now, I'm leaning towards biting the bullet and going with 2010.

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• LM Sensors always returning same (invalid) value for one temp sensor

  - by pkaeding

  I am trying to monitor the temp sensors on a server, and plot them using Cacti. I have lm-sensors installed and working correctly. For example, here is the output from sensors: % sensors acpitz-virtual-0 Adapter: Virtual device temp1: +26.8 C (crit = +100.0 C) temp2: +32.0 C (crit = +60.0 C) coretemp-isa-0000 Adapter: ISA adapter Core 0: +36.0 C (high = +105.0 C, crit = +105.0 C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +42.0 C (high = +105.0 C, crit = +105.0 C) However, when I try to get this data via SNMP, I get only one sensor's temperature correctly, and another one always returns 100.000 C: % snmpwalk -Os -c public -v 1 10.8.0.18 -m ALL lmTempSensors lmTempSensorsIndex.1 = INTEGER: 0 lmTempSensorsIndex.2 = INTEGER: 1 lmTempSensorsDevice.1 = STRING: temp1 lmTempSensorsDevice.2 = STRING: temp1 lmTempSensorsValue.1 = Gauge32: 26800 lmTempSensorsValue.2 = Gauge32: 100000 So, my question is two-fold: Why is the second sensor that is returned by SNMP giving a value of 100 C (when it should be 32 C) Why are my CPU core sensors not being returned by SNMP?

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