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• DBD::mysql gives mysql_init not found

  - by highBandWidth

  I have to install a non-admin copy of mysql and perl module DBD::mysql in my home directory. I installed mysql in ~/software/db/mysql and this works since I can start and stop the server and go to the mysql prompt. Then, I downloaded the perl module and installed it using perl Makefile.PL PREFIX=~/myperl/ LIB=~/myperl/lib/lib64/perl5/ --mysql_config=/my_home/software/db/mysql/bin/mysql_config --libs=/myhome/software/db/mysql/lib/libmysqlclient.a make make install I did this to use the statically linked mysql client library. perl -MDBD::mysql -e 1 gives no errors. However, when I actually try to use the module, I get /usr/bin/perl: symbol lookup error: /myhome/myperl/lib/lib64/perl5/x86_64-linux-thread-multi/auto/DBD/mysql/mysql.so: undefined symbol: mysql_init

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• How do I redirect/rewrite to the FQDN URL without setting ServerName?

  - by ChaimKut

  Often in intranets, users will direct URLs to a hostname without supplying the FQDN. Example: http://internalHost Instead of http://internalHost.example.com I would like to redirect users / rewrite URLs so that everything will use the FQDN. Here's the catch: I don't want to set ServerName explicitly. (This is for a product which will be deployed in multiple intranets so we can't know the value of ServerName ahead of time). According to: http://wiki.apache.org/httpd/CouldNotDetermineServerName Apache uses a reverse lookup to determine a default FQDN. How can I make use of/reference that FQDN that Apache is using for a mod_rewrite or redirect?

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• While Mail Forwarding with exim, how do I rewrite the To header with true destination address

  - by Jom

  I have mail forwarding setup with exim using a domain forwarding file. virtual_aliases_nostar: driver = redirect allow_defer allow_fail data = ${if exists{/etc/valiases/$domain}{${lookup{$local_part@$domain}lsearch{/etc/valiases/$domain}}}} file_transport = address_file group = mail pipe_transport = virtual_address_pipe retry_use_local_part domains = lsearch;/etc/localdomains unseen It is working fine. However, I would like to rewrite the "to" header. In my system filter, I would like to put something like: headers remove to headers add "To: $recipient:" I've tried: headers remove to headers add "To: $recipient:" headers remove to headers add "To: $h_env-to:" headers remove to headers add "To: $env-to:" The intent is to have the end recipient see their own email address in the To: line of their mail client. I can't seem to figure out what the correct header is for the final destination of the email so that I can put it in the to header. I've read through the Exim docs and can't seem to find it. I've also looked in the headers in an email at a mail client and can't see it there either. Any suggestions would be appreciated.

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• zeroconf (bonjour/avahi): macs do not see linuxes and vice versa

  - by codesnik

  In my home network I have several OS X boxes and several Ubuntu boxes. each Ubuntu box sees other boxes via zeroconf. I can "ssh ubuntu1.local" and "ping ubuntu1.local" from "ubuntu2.local", but both fail to lookup OSX boxes. and other way around, I can "ssh mini1.local" from "mbair.local". but it doesn't see "ubuntu1.local" why? do ubuntu and osx use different flavours of zeroconf? could be ubuntu, or osx tweaked to use common flavour?

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• Grant relay to servers based on AD security group membership

  - by john

  We're moving our relay from an Exchange 2003 server to an Exchange 2010 server. I was hoping the "Grant or deny relay permissions to specific users or groups" option would still be available in some form, but I can't find out how to do it. I've read up on recieve connectors and so far I can't get it to work. I have edited the security on the Recieve Connector to allow the following extended rights to the group and added computer accounts to that group: Accept Routing Headers Bypass Anti-spam Submit to Server Accept any Sender Accept any Recipient Then I suddenly realised while testing... How would the receive connector resolve the permission to a particular AD object, maybe a reverse DNS lookup? What I'd like to know is if what I'm trying to achieve is possible, and how it would be possible. I would rather not revert to an IP-based list as this is not as manageable, and I'm trying to avoid creating static IPs/reservations for a number of workstations that would otherwise not need them.

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• Ubuntu 12.04 VPS doesn't boot with mysql in nsswitch.conf

  - by chrisv

  1and1 VPS ("dynamic cloud server") does not boot any more as soon as mysql lookup is enabled in nsswitch.conf - any suggestions appreciated. Minimal setup to reproduce the problem: install Ubuntu 12.04 / LTS minimal server image install mysql-server, libnss-mysql-bg, nscd configure /etc/libnss-mysql.cfg and /etc/libnss-mysql-root.cfg set up appropriate database tables configure nss lookups through mysql in nsswitch.conf passwd: compat mysql group: compat mysql shadow: compat mysql Now, when I try to reboot the server it just hangs. No logs (maybe due to /var not yet being mounted), and I can't see console output (since this is a VPS). Booting into recovery image and removing "mysql" from /etc/nsswitch.conf makes the system bootable again, so this is definitely related to nsswitch/libnss-mysql-bg. There's a thread on gentoo-users which seems to describe a similar problem, unfortunately there's no real solution described, also the thread is rather old (from 2006) so I'm not sure whether this applies to me at all.

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• Determining Namespaces Not in the ACPI Spec

  - by Eddie B

  I am trying to determine how it may be possible to find documentation for namespaces that are not documented in the ACPI spec. I have an Asus uEFI BIOS v(3202) and I'm receiving kernel messages stating AE Namespace lookup failures for DSSP. This is referring to a namespace that is not in the ACPI spec. I'm presuming that this is vendor specific and refers to a Digital Sensor Signal Processor. That is only a presumption. In an effort to correct ACPI errors I have dumped my DSDT using acpidump and then decompiled it using iASL. Yet to fix the error I need to know the spec on the namespace. How can I get access to the BIOS documentation that isn't part of the ACPI spec?

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• Is there a way i can see why Squid (Proxy Server) determines why a resources should be a MISS?

  - by Pure.Krome

  Hi folks, I'm using Fiddler/FireBug to debug some of our live server web content. We're getting a lot of :- X-Cache: MISS from X-Cache-Lookup: MISS from :8080 Via: 1.1 :8080 (squid/2.7.STABE3) I thought i knew a lot about cache-control / expires / last-modified / etags, etc.. but maybe not. So .. is there a way I can run squid in some verbose way to see why it thinks a resource which i request, is cached/is not getting cached, etc.. which is why we're getting MISSes back? cheers :)

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• Why change net.inet.tcp.tcbhashsize in FreeBSD?

  - by sh-beta

  In virtually every FreeBSD network tuning document I can find: # /boot/loader.conf net.inet.tcp.tcbhashsize=4096 This is usually paired with some unhelpful statement like "TCP control-block hash table tuning" or "Set this to a reasonable value." man 4 tcp isn't much help either: tcbhashsize Size of the TCP control-block hash table (read-only). This may be tuned using the kernel option TCBHASHSIZE or by setting net.inet.tcp.tcbhashsize in the loader(8). The only document I can find that touches on this mysterious thing is the Protocol Control Block Lookup subsection beneath Transport Layer in Optimizing the FreeBSD IP and TCP Stack, but its description is more about potential bottlenecks in using it. It seems tied to matching new TCP segments to their listening sockets, but I'm not sure how. What exactly is the TCP Control Block used for? Why would you want to set its hash size to 4096 or any other particular number?

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• Want to SASL/TLS authentication

  - by Naval

  I want to send mail from remote client from my server(centos 5 and 64 bit) for this i need to sasl auth but i have no idea about it what changes i have to make in my server and client here I want to make things more clear my server's hostname/Ip is = test02.s80.in/176.67.172.209 now i want to authenticat remote client vps2.smail.info and vps1.smail.info to deliver mail .. so plz help me if any systematic way to do sasl/tls authentication for these clients... i am using DNS load-balancing(round-robin) mx record lookup technique for load balancing..

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• Network interface selection

  - by Antonino

  Hello. Suppose I have more than a network interfaces and I want to selectively use them per application. eth0 is the standard interface with the standard gateway in the main routing table eth1 is another interface with a different gateway. Suppose I launch an application as a user "user_eth1". I used the following set of rules for iptables / ip rules. IPTABLES: iptables -t mangle -A OUTPUT -m user --uid-owner user_eth1 -j MARK --set-mark 100 iptables -t nat -A POSTROUTING -m user -uid-owner -o eth1 user_eth1 -j SNAT --to-source <eth_ipaddress> IPRULE: ip rule add fwmark 100 lookup table100 and i build "table100" as follows (no doubts on that) ip route show table main | grep -Ev ^default | while read ROUTE; do ip route add table table100 $ROUTE; done ip route add default via <default_gateway> table table100 It doesn't work at all. What's wrong with this? Thank you in advance!

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• Can qmail-ldap replace the validrcptto file?

  - by T. Fabre

  We are using qmail to route incoming mail to our Domino server. However, that requires us to maintain the validrcptto with the list of all allowed email addresses. Since Domino provides an LDAP directory, does qmail-ldap provide functionnality to lookup valid rcpt to addresses in the Domino directory instead of the validrcptto file, so that we wouldn't have to maintain that extra list ? We have about 150~200 users, so is setting up qmail-ldap worth the extra mile if it can verify addresses in the LDAP directory ? If anyone has experience with qmail-ldap and its setup, I'd be glad to hear from you.

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• Reverse DNS for two ADs in the same subnet

  - by SpacemanSpiff

  I currently have two separate AD forests that exist within the same subnet. The two forests have independent copies of the reverse lookup zone for that subnet. Example: Domain A DC1: 10.1.1.1/24 Domain A DC2: 10.1.1.2/24 Domain A AppServer1:10.1.1.3/24 Domain B DC1: 10.1.1.11/24 Domain B DC2: 10.1.1.12/24 Domain B Appserver1:10.1.1.13/24 What I'm after, is a configuration that allows this reverse zone to be shared between them so that both sets of DNS servers can make updates to the zone. This kind of thing is a little far from my everday work, so a kick in the right direction is a welcome suggestion as well. Decoupling one AD into new segments is a possibility I'm open to but would like to avoid if possible. If there is a DNS related solution I'd prefer that.

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• Best way to block a country by IP address?

  - by George Edison

  I have a website that needs to block a particular country based on IP address. I am more than aware that IP-based blocking is not a foolproof method for blocking visitors, but it is a necessary step in the right direction. Since I'm using PHP, what I would do is use a GeoIP database like geoplugin.net. However, I'm curious to know if there's a better way of doing this. The website is on a shared webserver (I don't have root access) and it is running Apache on centOS. I guess my question is "can an .htaccess file be configured to block by IP using an external source to lookup IP addresses."

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• search nfs network volume from mac client

  - by user1440190

  Asked: how does a Mac OSX SL or Lion user search the cluster for a particular file (foo.txt) "From the cluster, you would need to run some form of recursive lookup for the file desired. As an example, using 'find'. RAM-1# find /ifs |grep test.txt /ifs/Elements/avid2test.txt /ifs/Elements/test.txt I would suggest contacting Apple support regarding their recommendation for searching for files on remote file systems from the Mac client itself" OK that's great, but I don't want users using CLI !!! Anyone know a good method (non-CLI)? Spotlight is not an option. BTW cluster is roughly 80TB

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• Disable NSS LDAP IPv6 (AAAA) lookups

  - by pilcrow

  Question: How can I disable inet6 AAAA queries for my LDAP server during (LDAP-backed) NSS lookups on a CentOS (RHEL) 5 machine? Background: I've servers configured to consult ldap://ldap.internal for NSS passwd and group lookups. Every relevant NSS lookup, for example the getpwuid(3) implied by an ls -l which needs to translate UIDs to network user names, performs the following DNS dance before connecting to the ldap server: AAAA? ldap.internal -> (no records) AAAA? ldap.internal.internal -> NXDomain A? ldap.internal -> 192.168.3.89 I'd like to skip the first two queries completely. Configuration: [server]$ cat /etc/redhat-release CentOS release 5.4 (Final) [server]$ grep ^passwd /etc/nsswitch.conf passwd: files ldap [server]$ grep ^uri /etc/ldap.conf uri ldap://ldap.internal/ For what it's worth, IPv6 support is otherwise disabled on these systems: [server]$ grep off /etc/modprobe.conf alias ipv6 off alias net-pf-10 off [server]$ echo "$(ip a | grep -c inet6) IPv6-enabled interfaces" 0 IPv6-enabled interfaces

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• Windows Server 2003: Remapping external domain

  - by Chuck Harmston

  We're playing a going-away prank on a coworker, and would like to use a rule in our internal DNS server to redirect techcrunch.com to point at one of our internal development servers. Basically, I'd like to accomplish the same thing as adding a line to a Linux /etc/hosts file, only for the entire network. I have access to our DNS server. How would you go about doing this? I created an entry in the reverse lookup subnet with the 'Host Name' of techcrunch.com and the 'Host IP' of our development server, a Linux box running Debian on which I've created a virtualhost to handle requests to techcrunch.com. It doesn't appear to be working, however, and my expertise has reached its limit. Thanks!

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• incorrect DNS entries on server 2008 r2

  - by user137841

  On the main DC (windows server 2008 R2 standard) in our network I have to clear some old DNS entries every now and then in the Forward and Reverse Lookup Zones. I have set the server Aging/Scavenging settings to Scavenge stale resource records, with both the No-refresh interval and Refresh interval to 5 days. Yet every now and then I still have to logon to the sever and remove the DNS entries for computers that is not part of the domain anymore or has been renamed ect. Is there a different way to automatically remove the old entries?

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• Make BIND use DHCP DNS as backup

  - by cainmi

  I run BIND locally on my OS X machine, to enable wildcard Apache vhosts, which requires setting the DNS server for all network interfaces to 127.0.0.1. This works great, but means when I am on a network which uses an internal DNS server to route special (i.e. .companyname) URLs to a server on the network, the lookup fails. I tried adding both 127.0.0.1 and the DHCP provided DNS server, but this doesn't work either. Is there a way to make BIND use the DHCP DNS server for requests it cannot resolve locally?

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• Keyboard-Shortcut driffen Utility to move windows around on multiscreen setup

  - by Wolfgang Fahl

  I am looking for a utility to move windows around on a multiscreen (usualy dual screen) setup. So with a keybord shortcut (or mousclick) I would like to send a windows to another monitor. I am using this functionality a lot when I give presentations. I'll lookup something on my mainscreen and then send the window to the screen or beamer where others can see it. Its also useful when working or when I want to send a screen from my computer to the TV screen that is hooked up to the computer. I know two solutions for a) Windows b) Mac OS but none yet for Linux. I'll post my windows and Mac OS solutions as answer and would be interested in other opinions.

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• Text template or tool for documentation of computer configurations

  - by mjustin

  I regularly write and update technical documentation which will be used to set up a new virtual machine, or to have a lookup for system dependencies in networks with around 20-50 (server-side) computers. At the moment I use OpenOffice Writer with text tables, and create one document per intranet domain. To improve this documentation, I would like to collect some examples to identify areas where my documents can be improved, regarding general structure and content, to make it easy to read and use not only for me but also for technical staff, helpdesk etc. Are there simple text templates (for example for OpenOffice Writer) or tools (maybe database-driven) for structured documentation of a computer configuration? Such a template / tool should provide required and optional configuration sections, like 'operating system', 'installed services', 'mapped network drives', 'scheduled tasks', 'remote servers', 'logon user account', 'firewall settings', 'hard disk size' ... It is not so much low-level hardware docs but more infrastructure / integration information in these documents (no BIOS settings, MAC addresses).

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• Apache on Windows random long wait times

  - by Jaxbot

  I have a development machine with Apache installed as a service on Windows. The installation is fresh out of the box, with no changes to configuration aside from adding the PHP module. From day one, I've had a problem that looks like this: Essentially, Apache is freezing for about 11 seconds before replying on random requests. This appears to happen more frequently when the host hasn't been connected to in a while, but this is not always the case. I've eliminated MySQL, PHP, and the specific application; this long wait problem will occur even when loading a static file such as favicon.ico. Thus, the only factor remaining is Apache, which is freezing for consistently around 10-11 seconds before replying. The problem is not the DNS problem that many people point to; as you can see, the DNS lookup is instant, and the problem occurs both on localhost and 127.0.0.1. Thanks for the time.

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• Excel: Look up function for combinations of cells in a single column

  - by Rebecca

  I'm looking to find the number of times a certain combination of values appears in a single column, I was hoping to do this in Excel but I'm starting to think it may not be possible. As an example, I have a list that looks like a longer vertical version of this: F1 F3 F2 F4 F1 F3 F4 F1 F3 F4 F1 F3 F4 And I want to know how many times a specific order (say F1 F3 F4) occurs, in this example 3 times (in my case the lookup sequences are 8 cells long). Is there a way to run over the whole column and identify the instances where this combination of cells occurs? I'm running Excel 2008 for Mac. Many thanks!

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• Microsoft DNS Server (Windows 2008) CNAME issue

  - by Lukes123

  I am using the DNS role in Windows Server 2008 R2. I have my records set up correctly with the following CNAMEs: {removed domain names for security} Currently, only the 'wsp' cname works. All the records are identically set up. I have checked with a DNS checker, and the other two CNAMEs do not resolve to anything. I have tried restarting the server, re-creating the forward lookup zone. Can anyone see what is wrong? 'A' records work fine when set.

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• Is it possible to push DNS search suffices from DNS server to client?

  - by Mark

  Our (active directory, windows-server-based) intranet used to be called "intranet", and DNS worked fine for windows machines and iPads/Android devices. We have changed it to be "apps.intranet", and it still works for windows machines, but no longer for iPads/Android devices. I think this is because out windows clients are configured to append .company.com when searching DNS, to make it a fully qualified lookup (this search suffix list is pushed to the PCs via AD group policies). I must admit, though, I don't know why it worked with just "intranet"! Does anyone know if it's possible to get DNS to "tell" the iPads/Android devices to append .company.com ... or how we can make it work some other way (but still using the multi-label, non-qualified DNS names) ? Thanks!

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