dns
How do I clear System.Net client DNS cache?
I finally dug up the obscure command from MSDN that fixes this: ServicePointManager.DnsRefreshTimeout = 0; As I unwound all the weird things I’d tried previously, I discovered one other setting that I need along with the one above; on the request object, turn off keep-alive: request.KeepAlive = false;
Why ww2 sub domains?
People running large(-ish) sites used to do this when they needed to break up the load between more than one server. One machine would be called www then the next one would be called www2, etc. Today, much better load balancing solutions are available that don’t require you to expose your internal machine naming conventions … Read more
Using MX Records to Forward Email to Another Domain
if you need just catch email on domain and forward to you other mailbox, you can use http://improvmx.com/ just by adding MX records to your domain
What is a Domain Model
Basically, it’s the “model” of the objects required for your business purposes. Say you were making a sales tracking website – you’d potentially have classes such as Customer, Vendor, Transaction, etc. That entire set of classes, as well as the relationships between them, would consititute your Domain Model.
Docker cannot resolve DNS on private network [closed]
Docker populates /etc/resolv.conf by copying the host’s /etc/resolv.conf, and filtering out any local nameservers such as 127.0.1.1. If there are no nameservers left after that, Docker will add Google’s public DNS servers (8.8.8.8 and 8.8.4.4). According to the Docker documentation: Note: If you need access to a host’s localhost resolver, you must modify your DNS … Read more
MySQL Query to Count Unique Domains from Email Address field
You would have to do something like this: SELECT substring_index(email, ‘@’, -1) domain, COUNT(*) email_count FROM table GROUP BY substring_index(email, ‘@’, -1) — If you want to sort as well: ORDER BY email_count DESC, domain;
Set DNS options during docker build
Dockerfile-based solution You can also fix the DNS lookup problem on a per RUN-command level: RUN echo “nameserver XX.XX.1.1” > /etc/resolv.conf && \ echo “search companydomain” >> /etc/resolv.conf && \ command_depending_on_dns_resolution Keep in mind: This will only change the DNS resolution behaviour for this one RUN command, as changes to the /etc/resolv.conf are not persistent … Read more
Requesting A and AAAA records in single DNS query
I’m not aware of any nameservers that support multiple questions in a single query. There’s potential for ambiguity in such a query, since there are per-packet flags (such as AA) which could apply to only one of the questions. If you ask two questions and the server is authoritative for only one of the domains, … Read more