Primary And Secondary Servers (web And Mail)

Jun 30, 2008

I have 2 servers 1 US and 1 UK.

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.

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DNS Servers Primary Secondary

Mar 22, 2007

clarification on DNS.

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:

ns1.mydomain.com -> FIRSTSERVERIP
ns2.mydomain.com -> SECONDSERVERIP

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?

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Apr 22, 2009

I have the following three servers, which I'll call A, B, and C:

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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)?

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May 26, 2008

i have just bought a dedicated server with 2 ips.

i already put type master in named.conf along with a zone file having 2 nameservers pointing to A records

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ns2 IN A 2.4.6.8

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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?

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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 -F
iptables -t nat -F
iptables -t mangle -F
iptables -X
iptables -t nat -X
iptables -t mangle -X

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

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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

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I've been thinking about getting setup with some kind of fail safe setup in case my primary name server goes down.

Would Secondary DNS services take care of that?

If so, anybody know where I can find a reliable, affordable secondary DNS service?

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there is the error in our server

[url]

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[url]

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