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Can I use multiple nameservers?
You sure can. For example, where I work, we have 4 name servers, 2 hosted with one DNS host, one hosted by us, and the other one hosted by a second external DNS host.
Why there are multiple nameservers listed?
The name server is separate from your actual server (at least it should be), so even if you have a single point of failure with your server, you’ll want redundancy at the NS layer. Yes if you main server goes down you’re offline, but multiple name servers will protect you from one of those being unavailable.
Can we have multiple A records?
You can do a lot with A records, including using multiple A records for the same domain in order to provide redundancy and fallbacks. Additionally, multiple names could point to the same address, in which case each would have its own A record pointing to that same IP address. The DNS A record is specified by RFC 1035.
How do multiple DNS records work?
A DNS server with round-robin enabled will have multiple different A records, each with the same domain name but a different IP address. Each time the DNS server is queried, it sends the IP address to which it most recently responded with to the back of the queue, operating on a loop.
When to try the next nameserver in resolv.conf?
The resolver will only try the next nameserver if the first nameserver times out. The resolv.conf manpage says: Internet address (in dot notation) of a name server that the resolver should query. Up to MAXNS (currently 3, see ) name servers may be listed, one per keyword.
How many name servers can resolv resolver query?
The resolv.conf manpage says: Internet address (in dot notation) of a name server that the resolver should query. Up to MAXNS (currently 3, see ) name servers may be listed, one per keyword. If there are multiple servers, the resolver library queries them in the order listed.
How to find multiple domains in resolv.conf?
If it is in /etc/hosts then ping will find it but host and nslookup won’t because they only interrogate name servers. Your response from host this time indicates the name servers still don’t know the answer. 1) You have 127.0.0.1 in resolv.conf – Unless you’re running DNS (e.g. BIND) on the local host that shouldn’t be there.
How to add specific record in Linux resolv conf?
Impossible to achieve using /etc/resolv.conf only. add specific record: server=/mydomain.local/10.250.0.2 to all requests for hosts in mydomail.local go to that server. Actually this can be done if you are using dnsmasq.