Server :: Dns Server - Caching - Not Working ?
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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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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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 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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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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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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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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Jul 8, 2011
what is bind vs bind-chroot vs caching-nameserver ?what is the different between eatch others ?
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Dec 2, 2010
I'm no expert on DHCP. My problem is that i have a CentOS 5.5 server on which i want to install a DHCP server. I have two NICs where eth0 has access to the internet and where eth1 should act as an DHCP server.
I have installed dhcpd and this is how my dhcpd.conf file looks like.
Code:
ifconfig looks like this
Code:
When i start dhcpd on eth1 i get no error messages but when i connect any devices to eth1 they don't get any IP. I cant find anything in any logs about devices trying to get an IP address. I dont have any firewall rules in iptables.
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Jun 23, 2010
i compiled and install postfix, and i using relayhost that point to my ISP. but my "DNS server" is on the same server where is installed postfix. and there is running apache with vhosts so i have domain that hosted on same server and in zonefiles of my domain my MX records points to Google Apps, to google's MX servers. But when i try send E-mail via sendmail to mail@mydomainonsameserver.com it not deliver mail to Google Apps totally, if i try to send to another E-mail everything fine it deliver it. so finally i done research this problem in Internet. And find that need to disable deliver mail to localhost(localdelivery)as i think postfix understand that the domain point to the same server where postfix have itself. and try to deliver mail local. but zonefile MX record even the domain on same server can point to another server outside. So i disabled localdelivery in postfix. and problem not fixed
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Jan 14, 2010
LDAP is endlessly not working, due to difficulties to simply configure it. I even cannot make the first steps of the installations ... It seems so difficult ... After many howto, wiki, reading, re-reading the errors are still there, always different, and not working.Is there an admin, coming from hell, that made running a LDAP server for sharing the basic configuratin files /var.. /etc... of a working LDAP Server in a tar.gz?
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Jun 30, 2010
Whilst I have used GUI-based Linux distros for the last few years, I am now struggling somewhat when it comes to setting up a server from the command line. All the howto's I've read so far tell you how to set up certain things, but I don't know what I actually need to set up.Rather than asking the same questions all over again on a forum like this, and generally being a bit of a noob, I wonder if there's a resource somewhere that someone could direct me to in order to know what I need to do to set up a fileserver.
The hardware is all done, and I will probably set up a router distro like IpCop to manage the network, but I'm rather lost as to what packages I need, and how to know what the server is/isn't doing.I've used plenty of command lines in the past (ms dos, amiga dos, BASIC programming etc), just not a linux command line. All I've ever done is mount a few drives, use nmap and started x
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Aug 31, 2009
OS: CentOS 5.3
vsftpd ver: vsftpd-2.0.5-12.el5_3.1
I installed vsftpd server in one of my servers using "yum install vsftpd" command. NFS server is running in the other server and mounted as "/data" in this FTP server. root in FTP server has also root authority in NFS server. All the files and sub-folders under "/data" in FTP server have 755 or 766 mode. Even I modified vsftpd setting to allow root login.
When I login as root to FTP server with FileZilla client, I can see all the file list in root home directory and move to /data directory. I can download any file in a local HDD but I can not download any file in /data directory.
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Aug 3, 2010
I only allow my users to access my web-server (apache) on working hours (mon to fri and 08:00 to 17:00).. how to configure my Apache?
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Jun 8, 2011
I am still quite new to all this but I guess we were all beginners once, this forum seems very helpful.Here is my situation, I will give as much detail as I can.I have a dedicated server which is running CentOS release 5.5.Initially I had Plesk installed, but when I upgraded PHP I damaged the Plesk configuration, and so I installed Webmin instead.
All seems to be fine with this, apart from the DNS configuration / BIND server.I know this because I have one site which uses an external DNS server and this works fine (i.e I can access it from a browser). All the others don't resolve - i.e the ones I set up in Plesk.I've done a bit of investigating to see what is going on, but I'm stabbing in the dark a little.
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Feb 17, 2010
hey guys i am facing problem with command yppasswd on my server and clineti have configured my server well.when i run command yppasswd -p joe it shows that yppasswd is not running on master server below is error i get
[root@station226 ~]# cat service_restart
service nfs restart
service ypserv restart
[code]....
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Jun 8, 2010
Running web service and dhcp only on 1pc of a 4pc lan. Optomized minimal slackware 13.1 install (no GUI)on 30g fireball for only one user (myself):
Question is howto work properly in terminal environment: the rule of thumb is not to work on system as root to maintain root's integrity; since i do not have /home for users - what identity do i create to work on files safely? Can you adduser identity without /home as to not work as root? I found 'netgroup' but i am not sure that setting up the id of other machines on lan is what need to do?
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Apr 2, 2010
I have installed a linux server in my office to run 16 machines. Its main use will be a internal mail server but will be also running websites.
I have installed Ubuntu 9.10 server x64 and have got apache running.
I am looking for the simplest more robust solution for smtp, pop3 and imap. I have only ever used qmail before and found it a pain to configure and its getting old so I though I should probably try something new. I have not much experience with running pop3 or imap on linux so would love a suggestion on that.
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Sep 29, 2010
have to create a webhost on an running fedora server which runs multiple webpages + a coldfusion serveri have to add an coldfusion virtual host to these.what i would do:*crate a new user & group*enter vhosts.conf and copy an existing host and modify it for the new one.*create an new folder and copy the main files (phpstarter and webroot) *chown the files for the right useri think an apache graceful would be needet
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May 5, 2011
Right now i have a HP DL 180 Server with 130 Gb Hard Disk & 8 Gb ram after Raiding0+1. i want to configure Domain Controller Server for my office for 200 to 300 Users. what should the partition size must be mentioned in my 130 Gb Hard Disk, is that going to be Sufficient for ME ?
i am bit confused about /Usr /Var /Boot partitions, as i need to manage perfectly in 130 GB
if i go with 4 Gb swap and remaining for " / " is that will be fine ? should i need to specify partition sizes separately for / tmp /var / usr ..
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Apr 21, 2011
I'm running a linux cloud server with the following config
1.2ghz Processor allocation
752MB Ram
The site loads slow and clicking a link almost freezes the page for a second. Also, the page loads could be much faster. We've been running mysqltuner and have pretty much optimized all slow queries. Is there anything we can do to fine tune the server for faster and more responsive?
Httpd.conf
Timeout 20
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 5
<IfModule prefork.c>
code....
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