Red Hat :: Caching Name Server DNS
Sep 25, 2009
I am trying to setup a Caching-Name Server for my lab but I am unable to locate the named.caching-nameserver.conf under /etc directory. I am trying to use this file as a template.I already checked the /usr/share/doc/bind-* for samples but unable to find it.I am using RHEL5 with bind and bind-chroot packages installed.
Can someone tell me where I can find named.caching-nameserver.conf file? Also, I notice that there isn't /etc/named symbolic link... do I have to create the sym link to /var/named/chroot/etc/bind.conf
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Jan 25, 2011
I will be relocating to a permanent residence sometime in the next year or two. I've recently begun thinking about the best way to implement a home-based network. It occurred to me that the most elegant solution might be the use of VM technology to eliminate as much hardware and wiring as possible.My thinking is this: Install a multi-core system and configure it to run several VMs, one each for a firewall, a caching proxy server, a mail server, a web server. Additionally, I would like to run 2-4 VMs as remote (RDP)workstations, using diskless workstations to boot the VMs over powerline ethernet.The latest powerline technology (available later this year) will allow multiple devices on a residential circuit operating at near gigabit speed, just like legacy wired networks.
In theory, the above would allow me to consolidate everything but the disklessworkstations on a single server and eliminate all wired (and wireless) connections except the broadband connection to the Internet and the cabling to the nearest power outlets. It appears technically possible, but I'm not sure about the various virtual connections among VMs. In theory, each VM should be able to communicate with the other as if it was on the same network via the server data bus, but what about setting up firewall zones? Any internal I/O bandwidth bottlenecks? Any other potential "gotchas", caveats, issues? (Other than the obvious requirement of having enough CPU and RAM).Any thoughts or observations welcome, especially if they are from real world experience in a VM environment. BTW--in case you're wondering why I'm posting here, it's because I run Debian on all my workstations/servers (running VirtualBox as a VM for Windows XP on one workstation).
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Oct 4, 2010
I have configured Master and Slave DNS server in Red Hat Linux 4 Enterprise. I want to know about what is a Caching Nameserver and in which situation we use it? If there is a master and slave DNS server we can use cache name server as well ?
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Feb 25, 2010
I found in the following mail thread: [URL] That we can add, netgroup: caching compat and also the netgroup caching rules stanza in nscd.conf But the mail thread is for FreeBSD Unfortunately, I can't get any reference for RHEL 5.x I need to do exactly same stuff. The following line in my nscd.conf was enuf to leave me disheartened, :'(# Currently supported cache names (services): passwd, group,hosts The nsswitch.conf on my system works only with following: netgroup: nis Does neone knows if netgroup caching is supported by nscd.conf.
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Dec 17, 2010
I have a Bind DNS caching-only server setup that is working. I am bringing up a new AD domain controller that will also be a DNS server for that AD but I don't want it responding to any DNS queries except those that are AD related.So, my goal is to leave this caching server as the primary DNS server for stations on the network and have it forward requests for the AD domain to the domain controller.My understanding is that I just need a forward zone for that domain pointing to the domain controller. However it does not seem to be working.So that leaves me to think that my caching server is not forwarding properly.
For example, this AD is going to have a naming convention of hostname.mydomain.local.If I do an nslookup and specify the domain controller's IP address as the server, I can query addresses that exist in DNS on that server, such as dc1.mydomain.local.However, queries to my caching server times out (I get a response from the caching server if I query mydomain.local but none of the objects in that domain) Here is my named.conf file:
options {
directory "/var/named";
listen-on { 192.168.0.14; 127.0.0.1; };
[code]....
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Feb 12, 2009
I am looking into creating a web caching server for myself using fedora 10. I believe I need to use squid for this but it seems to have a lot of features. Basically, all I want for now is to be able to cache web pages that I and my network users use the most, increasing access time and lowering the load on my internet connection. Can squid do this and can someone point in the right direction on an article on how to configure such a thing?
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Sep 3, 2010
Basically, i have a clustered filesystem using GlusterFS. This is ultimately going to host a very large number of files.
It is mainly used as a storage destination for backups, and historical copies of files.
Remote servers sync using unison every few minutes. A local script will run over the whole filesystem once per hour looking for new files/folders, and files that have been updated based on their timestamp.
99% of filesystem access is browsing the directory structure, listing directory contents and checking the modification times of files. Access to the actual content of a file is minimal. Only a tiny fraction of the filesystem is actually modified from hour to hour.
GlusterFS alone is quite slow when browsing the directory structure. (ie. "ls -Rl /data") The speed of things for actually transferring file content is sufficient for my requirements.
What I need is to vastly improve performance when running operations such as "ls -Rl /data". (/data is the mount point)
I believe the best way to do this is to implement caching. The cache options within GlusterFS are simply not sufficient here.
My first thought was to re-export the GlusterFS mount with NFS, and then mount the NFS share and set the cache on the client to a very long expiry. (like 86400 = 24 hours) It is my understanding that any change made to a file using the mount point will invalidate the cache entry for that file. (it is only mounted in one place, so no changes possible at the back end.)
I did this using the kernel based NFS server, but ran into major problems with the "Stale NFS" errors which from reading is due to a problem related to FUSE that doesnt sound like its going to be fixed soon. Aside from the Stale errors, this did provide a suitable boost in performance.
I tried the beta of GlusterFS that has the integrated NFS server (so presumably, no FUSE) but I could not get this to compile properly on our servers.
Finally, I tried using the Gluster patched version of unfs3 that uses boost to talk to Gluster instead of FUSE. Now this works, but for some reason the NFS client cache doesnt seem to cache anymore.
One last thing that I was looking at is the possibility of running a simple cache layer in front of either GlusterFS or NFS. I believe Cache-FS is the tool for the job but I have been unable to get that to work - I believe it is disabled in my kernel or something. (mount command says cachefs is unknown)
I am running Ubuntu 8.04 on most servers, but have upgraded one to 10.04 to try and get around Kernel limitations. My servers are all 32 bit (I know, not recommended for GlusterFS) and its very difficult for me to change this. (its a live system)
I quite simply need to add a cache for the directory structure information, and then maybe export this with NFS so that it can be mounted on a *single* server. (the cache can be on the server where it is mounted if required, but due to the large size of the cache - it may be better to have a server dedicated for the cache)
I am running GlusterFS 3.0.5 in a replicate/distribute manner.
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Mar 13, 2011
There is this server that is running a lot of websites and runs varnish for caching for performance boosting. But I want to somehow remove certain URLs from caching which change frequently. But I do not want to remove complete domains from caching but certain URLs from the websites. Is there any way to remove those pages from caching?
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Nov 29, 2010
Is there anything like a persistent caching proxy available in linux for me to configure, ie not public? (persistent meaning the cache remains in hard disk between reboots) Is it possible that it NEVER looks for any update to a page that is available in the cache?
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Jun 29, 2011
I'm running into a little trouble trying to configure bind as a caching dns server on centos 5.6. for debugging purposes I've got iptables and selinux turned off, but I can't get see the dns service on my local network. on my server itself I can run nmap against it and see that port 53 is open, but if I try it from another computer on my network the port is closed.
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May 25, 2011
I want to configure proxy caching on my openSUSE boxYast >>> Proxy >>>
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Feb 14, 2011
I can configure a caching-only name server fine, but how do I make it forward DNS queries too?
I'm thinking I could add the below to the options stanza in the /etc/named.conf file:
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Oct 23, 2009
what i need, I got two servers for about 4000 users and 300 servers and well the guy never setup dns caching right, so im redoing it. Now my goals
1) DNS cache
2) Transparent Squid Cache only
3) Load Balance - at switchlevel
Upgraded Hardrives to SSD 2x32gb each server 4gb of ram 2x Dell poweredge 850's - p4 2.8 (single cores) So any advise , pointers , expeirnces and best ways to do this being both server will do both dns caching and squid! Also is bind9 the best for this?? i seen stuff about DNSmasq what performs better( i dont need DHCP)
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Sep 5, 2009
I've set up a caching nameserver on my laptop running Fedora 11. The problem with this is that NetworkManager always overwrites the entry that points to the local nameserver. NetworkManager no longer respects /etc/dhclient.conf or at least its scripts run after dhclient.conf. Also it doesn't respect /etc/sysconfig/ network-scripts/ifcfg-* setting of DNS{1.2}.The man page of NetworkManager describes scripts that run in /etc/NetworkManager/dispatcher.d which can be run when interfaces are brought up and down. I've written a script that will put the entry needed for the local nameserver.
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Jan 4, 2011
I have installed bind 9.3.6 on a centos 5.4 virtual machine. i have successfully installed it and i just want to run it as a caching server but it is not working.I mean when i dig any url it gives connection time out messages .
I checked /var/log/messages on my machine and there were two kinds of messages:
Now there are a lot of errors of the above two kinds only. The only difference in the errors are the ip address that is different.
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Feb 4, 2010
i want to configure a caching server on linux . that will be support better speed for resolve index. how can i do this .
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Jul 8, 2011
what is bind vs bind-chroot vs caching-nameserver ?what is the different between eatch others ?
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Aug 8, 2011
I am currently working on a project at work to do caching across a windows network (web traffic thorugh squid and windows updates with WSUS). It is proving to be an interesting learning project.This got me thinking about my home network. Currently I am running 8 Fedora Computers (with the very real possiblity of more in the forseeable future).
Oviously running "yum update" on every computer and having them download these updates directly on each computer eats a lot of bandwidth on the external link. I would like to know if there is a way to set up a proxy server (or something else for that matter) to cache yum downloads. This way when I deploy a new machine, or run updates, I can save time and bandwidth by only downloading the packages too my LAN once, instead of nearly a dozen times.
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Jul 11, 2010
I'm currently copying a large number of files over a network. To monitor progress, I tried running watch du. However, the output never changed (or not much, not sure). find . -type f | wc -l always gives me the same number of files as does ls -R. It seems, these programs use caching, which is, in general, a good thing. Does anyone know, though, how cache usage could be controlled? I'm on an Archlinux system and I'm working on an ext4 fs on an encrypted hd.
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Feb 8, 2011
i get this error whi trying to configure caching DNS namerver
[Code]....
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Feb 11, 2011
Prior to 10.10 if I enter my password to gain administrative permissions, for example to check for updates in Update Manager, the escalated permissions remain in effect for a period of time. If I close out of Update Manager and invoke the Synaptic Package Manager within a couple of minutes I am not asked for my passwordDoes anyone know if the was SUPPOSED to change in 10.10? I have reproduced the phenomenon in both the 32 and 64 bit versions of 10.10.
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Feb 1, 2016
I was wondering if a standard Debian 8 system with Gnome desktop does any kind of local dns caching, and if so, what the command is for clearing it. (Assuming I haven't purposely installed any DNS server software.)
I found multiple posts on the Web about unix DNS caching, but with widely different answers across distributions and across time.
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Apr 3, 2011
ran an internet cafe and last week my windows server got fried because of power surge. Now i got Fedora 14 running on another PC and i want to set it up as a full caching proxy server, so other computers can connect through it to the internet. I have 2 network cards inside.I'm really new to Linux and now learning my way around. I managed to install squid but don't know how to configure it to suit the purpose above
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May 9, 2011
I want to configure DNS Server on Fedora14. So I install caching-nameserver cause any template files.I can't install caching-nameserver on my Fedora14 by this command: [but i can do it on Fedora5]
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Jan 6, 2010
I have Ubuntu 9.10 PC on my home network acting as a VPN gateway. It is using vpnc & iptables to provide access to the remote network - other computers on my local network have routing rules in place to go via the Ubuntu gateway if trying to reach an IP on the remote network. This works just fine, except DNS lookups for names on the remote network don't work.
I'm trying to solve this by using Bind9 on the gateway, so it can act as DNS for the local network. I don't want to create excess VPN traffic or load on the remote DNS, so I want the gateway to forward the lookup to my ISPs DNS first and if the name is not found then try the remote network DNS. Is this possible, or is there another (better) way around this? The Bind9 configs seem to admit multiple DNSs, but use them in a failover sense - only using secondary DNSs when the first one in the list is not reachable at all.
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Feb 17, 2010
How do i exclude some URL from the proxy caching at squid.conf as i dont wont to cache ....., mediacafe etc, I know i can block site by create a file like bad-sites.acl, then adding it to squid.conf but that blocks it.
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Oct 22, 2010
Is it possible to disable caching of thumbnails in nautilus but still have them on? I tried linking .thumbnails to /dev/null but that just disabled them completely.
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Mar 15, 2011
I want to compile a Source to RPM with no Cache option. I have tried it with enable-storeio=null option in squid.spec file. After installing the compiled RPM, seen that it is making squid spooling directories and caching the objects, working fine.
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Mar 17, 2010
I'm experimenting with Squid [ job task =( ] Now Squid is configured to cache deb, zip, tbz2, gz, flv, etc. but I dont know how skip caching xml and other file types.
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Sep 4, 2010
I have a python script that I use to create Debian packages automatically for me. When running this under Ubuntu, it only requires the passphrase to be entered once to sign the changes and dsc files. However when running under Debian it is required to enter it every time. The script is using the debuild command to do the actual package building.
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