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You can discover service endpoints with DNS, distribute connections among local Node.js workers with cluster, or route HTTP requests among configured application servers with a reverse proxy such as NGINX. These mechanisms solve different problems: choose based on where your instances run and which component should own routing.
Choose the mechanism by the scope of the problem
Start by deciding whether you need more processes on one machine or routing across multiple application instances, potentially on separate machines. Node.js cluster helps with the first case. DNS records can publish endpoint information for clients that need to find services. An HTTP reverse proxy can route requests to an upstream list of application servers.
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| Mechanism | Scope | Where membership comes from | What you must manage |
|---|---|---|---|
| DNS and service records | Finding service endpoints across machines, if the environment publishes suitable records | The DNS zone or DNS service; SRV records can include target names and ports | Record updates, caching behavior, endpoint selection, and connection handling |
Node.js cluster |
Worker processes sharing a server port on one host | Workers started by the Node.js primary process | Worker lifecycle and whether local process distribution fits the workload |
| NGINX reverse proxy | HTTP routing among configured upstream application servers | The proxy’s upstream configuration | Keeping the configured upstream membership aligned with deployed instances |
These layers can be combined, but they are not interchangeable. For example, DNS may help an application find a remote service, while a proxy routes incoming HTTP traffic to a set of app instances. Neither function is supplied automatically by local worker processes.
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What Node.js DNS APIs do—and do not do
Node.js has two different kinds of name-resolution API. The distinction matters if you expect a particular DNS record type or want to build endpoint discovery.
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dns.lookup() follows operating-system name resolution
dns.lookup() uses operating-system facilities and may not send a DNS query over the network. It is useful for resolving a hostname through the host’s configured name-resolution path, but it is not the API to use when you specifically need DNS record data such as SRV records. See the Node.js DNS documentation.
dns.resolve* methods query DNS records
Methods such as dns.resolveSrv() use the DNS protocol to request records. An SRV result includes a priority, weight, port, and target name. Those fields give an application information about possible service endpoints; they do not implement a complete discovery system by themselves.
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For a real SRV-based client, your application still needs to decide how to select among returned records, establish and manage connections, refresh records, respond to failed endpoints, and handle caching appropriately for its environment. SRV helps only when the relevant DNS zone or provider actually publishes usable SRV records.
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Promises, address families, and TTLs
The Node.js DNS documentation describes both callback and Promise APIs, as well as address-family options for lookup. It also documents optional TTL output for resolve4() and resolve6(). Do not assume that every DNS method returns a TTL, or that an application cache will automatically honor one: your code and resolver behavior determine how results are refreshed and reused.
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Use cluster for multiple local worker processes
The Node.js cluster module creates separate worker processes that can share a server port. This provides process-level distribution on one host; it is not a service registry and does not discover remote machines. The Node.js documentation describes round-robin scheduling and a mode that leaves distribution to the operating system. Round-robin is the default except on Windows. See the Node.js cluster documentation.
A single Node.js process can already handle many concurrent connections. Adding workers changes process-level concurrency and resource use, so choose it to meet a workload or deployment need rather than treating it as a universal requirement. Worker distribution can help use multiple processes on a machine, but it does not tell another service where that machine is or which remote instances are healthy.
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Route HTTP traffic with an external reverse proxy
For HTTP traffic that must reach multiple application instances, NGINX documents a reverse-proxy approach using upstream application servers. The proxy becomes a routing point outside the Node.js processes, while the application servers handle the requests it forwards. See NGINX’s HTTP load-balancing documentation.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsWith a configured upstream list, someone or something in your deployment process must keep that list aligned with the instances that are actually available. Treat membership updates as an operational responsibility. The exact behavior for health checks, DNS re-resolution, sticky sessions, or dynamic upstream changes depends on the NGINX edition and configuration; do not assume those capabilities from the general reverse-proxy pattern alone.
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- One host, multiple Node.js processes: use
clusterwhen local worker processes are the scope of the need. - Finding a remote service: use ordinary hostname resolution when that is what the environment provides; use SRV only when suitable records are published and your application implements selection, refresh, and connection behavior.
- HTTP routing across app instances: use a reverse proxy such as NGINX with configured upstream servers, and keep its membership current through deployment operations.
The ownership boundary is as important as the mechanism: DNS administrators or services own published records, the Node.js primary manages local workers, and proxy configuration owners manage upstream routing. Combining layers is reasonable—for example, a proxy in front of several app instances, with DNS used to resolve a downstream service—but each layer needs an explicit source of endpoint membership and a plan for changes.
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