Domain name system

Q: How deeply does Learn Docker in a Month of Lunches, Second Edition cover domain name system?

Explains name resolution, Docker forwarding, and scaled lookup results, but stops short of DNS protocol internals.

As explained in Learn Docker in a Month of Lunches, Second Edition

DNS is the Domain Name System, a distributed naming system that resolves domain names to network addresses.

DNS links human-friendly domain names to IP addresses. Docker uses the same idea inside private networks, allowing containers to find one another without depending on fixed addresses. section 7.3

When a container looks up another container name, Docker’s built-in DNS service returns its current IP address. If the name is external, Docker forwards the request to the host for a normal organizational or public DNS lookup. Scaling can return multiple addresses, allowing consumers to reach replicated services. section 7.3

Verify service discovery

Scale the application, enter the web container, and run nslookup accesslog. Repeat with nslookup iotd after scaling iotd to three containers; the lookup can return each service container’s IP address.

How Learn Docker in a Month of Lunches, Second Edition covers it

Cover of Learn Docker in a Month of Lunches, Second Edition

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Also explained in

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Acing the CCNA Exam: Volume 2 Advanced Networking and SecurityThe Domain Name System is a distributed naming system that translates domain names into network addresses and related resource records.
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Acing the Certified Kubernetes Administrator Exam, Second EditionThe Domain Name System, a hierarchical naming system that resolves domain or resource names to network addresses.
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Build Python Web Apps with StreamlitDNS is the naming system that maps human-readable domain names and subdomains to network resources.
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ASP.NET Core in Action, 3eDNS is the hierarchical naming system that resolves hostnames to IP addresses and other network records.
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Rust in Action: Systems programming concepts and techniquesThe Domain Name System is a distributed naming system that maps domain names to network resource records such as IP addresses.
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Grokking Web Application SecurityThe Domain Name System (DNS) is the hierarchical naming system that maps domain names to network addresses and other DNS records.

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Related concepts

UDPuses · UDP (User Datagram Protocol) is a connectionless transport-layer protocol that sends datagrams without guaranteeing delivery, ordering, or duplicate suppression.
TCPuses · TCP is a connection-oriented transport-layer protocol that provides reliable, ordered delivery of byte streams between network endpoints.
IP addressproduces · An IP address is a numerical address used by the Internet Protocol to identify a network interface and support packet delivery across networks.
nslookupused by · nslookup is a command-line utility that queries Domain Name System servers and displays domain names, addresses, and other resource records.
service discoveryused by · Service discovery is the process of identifying available services and obtaining the names, locations, or connection information needed to access them.
CoreDNSused by · CoreDNS is an extensible, plugin-based DNS server commonly used in Kubernetes clusters for service and workload name resolution.

This explainer was generated by Manning's knowledge graph from the text of Learn Docker in a Month of Lunches, Second Edition. The section links point to the parts of the book it draws on.