What I wanna do is synchronize both of them using rsync. Once they've got synchronized, the UK will be the primary server and US will be secondary, in case the UK goes down.
my questions are
1. Is it possible that when the UK goes down, the A records for domain.com automatically switches to the US server so it can take over while UK is down.
ie. UK ip 112.113.114.1
US ip 222.111.444.5
domain.com A records = UK ip when up... but when UK is down, A records automatically changes to US ip.
2. And when the UK server goes up again, whatever changes made to US server will be pushed to UK. May it be files, accounts or e-mails.
I.E.
UK and US are synchronized every 30mins. UK and US both have e-mails 1-10.
Just before the sync time, UK server received an e-mail 11-15 then goes down. So the US Server will take over but do not have 11-15 mails, since it was received before sync time. During the UK downtime, US server received e-mails 16-20.
When the UK server goes up, will it be possible to sync both servers that both of them will have the e-mails 1-20?
I hope you get my point...
If these are not feasible, what can you advice as an alternative solution. All I want is to avoid downtimes, especially with mails as the business relies on this.
We currently have gps devices which report x,y coords. The devices currently report to a fully qualified name: servername.mydomain.com. And only one fully qualified name.
We would like to have redudancy, so if the main server goes down, then the secondary takes over. I assume this is accomblished via DNS.
So out first task is to create name servers at our domain registar and have them register them, for example:
Then on the both servers we setup DNS to accept the a record of servename.mydomain.com points to? This is where I get confused. Does the firstserver DNS say point to itself, and the second DNS server point to itself?
I have the following three servers, which I'll call A, B, and C:
Server A - Web hosting server that uses cPanel on CentOS.
Server B - Free subdomain service (similar to afraid.org but on a much smaller scale), using PowerDNS with a MySQL database backend, on Debian.
Server C - Backup DNS server for the cPanel web hosting server, using the free cPanel "DNS Only" on CentOS.
Originally I had just A and B set up (they're two separate VPSes on the one dedicated server, I own the dedi and some friends and I have VPSes on it). Now I've got a VPS at a different data centre, and am using that for C.
To have a secondary DNS server for server B, I believe I can use MySQL replication to replicate the PowerDNS database to another server, then have a PowerDNS install on that server. My question is, is it possible to have server C as a backup DNS server for both server A (cPanel server) and server B (PowerDNS server)? ie. is there a way to check both PowerDNS and the cPanel BIND9 for domains (have them on different ports, and make one query the other if the lookup fails, perhaps)? Or perhaps use both the MySQL backend and the bind backend simultaneously in PowerDNS, and replace bind with PowerDNS (although I guess cPanel wouldn't like this)?
I have two nameservers, each running physically on a different server on different networks. Now I've noticed that whenever the primary NS goes down, clients requesting authoritative NS record lookups refuse to connect to the secondary NS, which I know is certainly up and running. The secondary NS has its own zone files and when you specifically request that server to resolve NS requests, it does the work. But generic NS lookups without specifying the server appears to fail when the primary server is down.
Does anyone know what might be happening here? I know that the domain registrar has both nameservers recorded for the domains I'm trying to resolve, but what is the point of a secondary NS, when it isn't contacted when the primary nameserver is down?
I would like to reassure two DNS machines (a primary and a secondary) with iptables
By default I block everything, but even with rules for the port 53, it blocks the queries needing to resolve via the primary, and the secondary does not manage to transfer the zones of the primary …
DNS are on public ip, but to simplify, we are going to say that:
The primary DNS is: 192.168.0.10 The secondary DNS is: 192.168.0.20
Here are iptables rules(sliders) which I have at present:
iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -p tcp --dport 53 -j ACCEPT iptables -A INPUT -p udp --dport 53 -j ACCEPT
iptables -A INPUT -i lo --source 127.0.0.1 --destination 127.0.0.1 -j ACCEPT
Thus with these rules, I have quite a lot of problems (resolutions, transfersof zones) I found these rules on a forum, that seems to be interesting but as I do not know there not iptable, I ignore if it is what I miss or not.
For information here is all the same what I found (not tested):
#iptables -A INPUT -p tcp -s 192.168.0.20/255.255.255.255 --sport 1024:65535 -d 192.168.0.10 -dport 53 -m state state NEW,ESTABLISHED -j ACCEPT #iptables -A OUTPUT -p tcp -s 192.168.0.10/255.255.255.255 --sport 53:65535 -d 192.168.0.20 -dport 1024:65535 -m state state ESTABLISHED -j ACCEPT
I have two VPS with two different Datacenters. I am running my website on one of the VPS which has Plesk Panel 11.5 installed on it. Since my second server is not in use, I would like to use it as a Secondary DNS Server for redundancy. I know this can be done with Plesk Expand. But, I am not in a position to invest further as I just run 4 domains on my main server. I was looking at installing some free control panel on my secondary VPS and set it up as a Secondary DNS Server if possible. But, I could not find any Guides on setting this up.
How I can do this? I see that we have an option in Plesk - 'Switch DNS Service mode' which can be used to either setup my first server as a Secondary or Primary. I have installed Webmin/Virtualmin on the second server, but how to set this up perfectly. I can reinstall the 2nd Server if required, but not my first one with Plesk.
OK, I am confused. I have one domain that is parked on top of another domain. I would like Mail that comes to the parked domain to be automatically forwarded to the same user name at the primary domain.
Can I change a DNS or MX record to facilitate this?
I signed up with cheapvps.co.uk a month ago, and I'm very happy with them . Now I'm looking for a very small VPS to host a secondary DNS server, and maybe a backup MX server.
It's just for personal use.
I think 5GB disk space would be enough, and I would like not to spend more than $10 USD/month. Do you know any VPS that suits my needs?
I have configured my yahoo domain to use Leaseweb shared Linux hosting by changing my A records to my hosting IP. When I check my yahoo domain control panel I see,
Type: >>>>>>>>>>>>> Source: >>>>>>>>>>>>> Destination: CNAME Record>>>>>>>>>>>>>mail.mydomain.com>>>>>>>>>>>Yahoo! Hostname Problem
All my email addresses that I created from Leaseweb plesk control panel can not receive any emails (test emails bounce back with a failure notice)
I think I have to change the above CNAME record in yahoo domain control panel to leaseweb mail servers.
mail.domain.com is used as the MX record and is where users point their mail clients for POP/IMAP access. I'm obviously going to be relocating the record to a new IP.
My questions are:
In the interim period, can I have exim 'redirect' POP/IMAP connections to the new IP (for users), and can I have exim relay/forward (not sure on the term in this case) mail received from old DNS caches to the new mailserver IP?
We need a secondary DNS for our cPanel server, as we want to have separate nameservers. What is the cheapest vps anyone knows that is hosted outside of Bluesquare House (UK). Global location isn't important.
I have a VPS with LXADMIN Hostinabox single server and want to use this VPS as a secondary/slave DNS server. My primary/master DNS is hosted elsewhere.
Does the LXADMIN Hostinanox interface facilitate the ability to setup the secondary zone?
