Networking and Storage - Cloud Library
Library entryCloud Networking Basics: Addresses, Firewalls and Security GroupsPublic and private addressing, default-deny firewalls and the difference between a provider firewall and a host firewall.Library entryPort 25 and Outbound Mail From Cloud ServersProviders restrict outbound port 25 by default. Understanding why, and what deliverability actually requires, decides whether you need it at all.Library entryBlock Storage and Object Storage: Choosing CorrectlyBlock storage is a disk for one machine. Object storage is a key-value store over HTTP. Using the wrong one causes predictable problems.Library entryBandwidth, Egress and the Cost of Moving DataData in is usually free, data out usually is not. Transfer direction is the variable that turns a predictable bill into a surprising one.Library entryDNS Basics for Cloud-Hosted ApplicationsRecord types, TTL and propagation explained in the terms that matter when you are pointing a domain at a cloud server.Library entryPrivate Networking Between Cloud ServersKeeping internal traffic on private addresses is faster, cheaper and safer than routing it over the public internet. It is also easy to get subtly wrong.