NATS Stream Mirrors: Replicate Streams Across Clusters
NATS Stream Mirrors allow you to replicate streams across different NATS clusters, acting as a robust disaster recovery and high availability solution.
Nats Articles
80 articles
Fix NATS Stream Not Found Errors
The NATS JetStream component responsible for managing stream metadata failed to find the requested stream, indicating a critical discrepancy between wha.
NATS Retention Policies: Stream vs Subject Limits
NATS streams don't actually "retain" messages; they acknowledge them, and the actual message storage and purging is handled by the underlying stream con.
NATS Subject Permissions: Control Publish and Subscribe
NATS subjects are not just strings; they're the fundamental mechanism for routing messages, and their structure dictates security.
NATS Subject Design: Wildcards and Hierarchy Patterns
NATS Subject Design: Wildcards and Hierarchy Patterns — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
Fix NATS Subject Not Allowed Errors
A nats: subject not allowed error means a publisher tried to send a message to a subject that its associated credentials explicitly forbid.
Fix NATS Subscription Not Found Errors
The NATS JetStream server is rejecting publish requests because it can't find the expected stream or consumer associated with the subject.
NATS Supercluster: Connect Global Regions Together
NATS superclusters don't actually connect regions together; they are the connected regions, forming a single, unified messaging plane.
NATS TLS: Mutual Certificate Authentication Setup
NATS TLS mutual certificate authentication isn't about encrypting data in transit, it's about proving identity to NATS itself.
NATS Cluster Upgrade: Rolling Restart Without Downtime
A NATS cluster upgrade via rolling restart is actually a process of graceful degradation where nodes momentarily operate with a reduced quorum, not a tr.
Fix NATS Wrong Last Message Sequence Error
The NATS JetStream server is refusing to accept new messages because it believes the client is sending them out of order, indicating a potential data co.
NATS vs ZooKeeper and etcd: Coordination Compared
NATS is a message bus, not a distributed coordination service, and trying to use it as one is like trying to hammer a nail with a banana.
NATS JetStream: Pull vs Push Consumer Explained
NATS JetStream consumers are the primary way your applications interact with messages, but understanding the difference between "pull" and "push" consum.
NATS Core vs JetStream: Choose the Right Messaging
NATS JetStream is not an upgrade to NATS Core; it's a fundamentally different offering that adds persistence and guarantees to NATS's existing high-perf.
Fix NATS Deliver Subject Not Valid Errors
The NATS Deliver Subject Not Valid error means a NATS service tried to send a message to a subject that doesn't exist or isn't properly configured for r.
Fix NATS Duplicate Message ID Deduplication
The NATS JetStream server failed to acknowledge messages to a publisher because it couldn't verify their unique messageid values, leading to publishers .
NATS Durable Consumers: Replay Messages on Reconnect
NATS durable consumers can replay messages on reconnect, but they don't do it automatically by default; you have to explicitly enable and configure it.
Fix NATS Expected Stream Does Not Match Error
The Expected Stream Does Not Match error in NATS means that the stream configuration you're trying to use for a subject doesn't align with the stream co.
NATS Fan-Out: Broadcast Messages to Multiple Consumers
NATS fan-out isn't about sending a single message to many destinations; it's about having many independent consumers each receive a copy of the same mes.
NATS Flow Control: Prevent Slow Consumer Stalls
NATS flow control is designed to prevent a fast producer from overwhelming a slow consumer, but the default settings can sometimes lead to a different p.
NATS Global Hub: Multi-Cloud Deployment with Supercluster
A NATS Supercluster can span multiple cloud providers, but it doesn't magically make them behave like a single, unified network; you're still dealing wi.
NATS Headers: Add Metadata to Messages
NATS Headers: Add Metadata to Messages — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
NATS on Kubernetes: Deploy with Helm Charts
NATS on Kubernetes, when deployed using Helm, is fundamentally about managing distributed messaging infrastructure as application deployments rather tha.
NATS Horizontal Scaling: Add Servers for High Throughput
Adding more NATS servers to your cluster is the primary way to scale for higher throughput, but it's not as simple as just spinning up more instances.
NATS JetStream Ack Policies: Explicit, None, All
NATS JetStream's acknowledgment policies are the unsung heroes of reliable message delivery, and the "All" policy is the most surprising because it does.
Fix NATS JetStream API Errors
The NATS JetStream API is failing because the server is unable to fulfill requests due to a fundamental misconfiguration of its storage or stream defini.
NATS JetStream Backup: Snapshot and Restore Streams
JetStream backups are actually just point-in-time copies of your stream's message log, not a full database dump, and they can be restored in place over .
Fix NATS JetStream Not Enabled Errors
Your NATS JetStream errors mean that the JetStream functionality, which provides persistence and advanced messaging features, is not properly configured.
NATS JetStream: Configure Persistent Message Streams
NATS JetStream: Configure Persistent Message Streams — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
NATS JetStream Limits: Configure Max Age and Size
NATS JetStream's "Max Age" and "Max Size" limits aren't just arbitrary caps; they're fundamental to managing the dynamic lifecycle and resource consumpt.
NATS Key-Value Store: Persistent KV on JetStream
The NATS Key-Value store is surprisingly capable of acting as a distributed, strongly consistent, replicated database, not just a simple cache.
NATS Latency Benchmarks: Measure Sub-Millisecond Performance
NATS can achieve sub-millisecond latency not by magic, but by aggressively minimizing overhead at every single step of message delivery.
NATS Leaf Nodes: Extend Clusters to Edge Locations
NATS Leaf Nodes: Extend Clusters to Edge Locations — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
NATS Max Connections: Configure Connection Limits
Setting NATS connection limits isn't about preventing denial-of-service attacks; it's about granular control over your NATS cluster's resource utilizati.
NATS Max Payload: Configure Message Size Limits
NATS doesn't really have a "max payload" in the way you might think; instead, it has a configurable maximum message size that prevents a single message .
NATS JetStream: Memory vs File Store Tradeoffs
NATS JetStream's persistence mechanism isn't just about picking "disk" or "memory"; it's fundamentally about how you trade off data durability and laten.
NATS Deduplication: Configure Msg-ID Dedup Window
NATS Deduplication: Configure Msg-ID Dedup Window — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
Fix NATS Message Loss from Slow Consumer Drops
Your NATS consumer is dropping messages because the NATS server is actively disconnecting it, not because the messages are getting lost in transit.
NATS JetStream Replay: Instant vs Original Timing
NATS JetStream's "replay" feature doesn't just re-deliver messages; it can deliver them with their original timestamps, which is profoundly different fr.
Fix NATS Message Size Too Large Errors
Fix NATS Message Size Too Large Errors. The NATS server rejected a message because its payload exceeded the configured maximum size. 1
Fix NATS Stream Mirror Not Found Errors
NATS Stream Mirror Not Found errors mean a consumer is trying to read from a stream that doesn't exist, usually because the stream wasn't properly confi.
NATS Monitoring: Scrape Metrics from HTTP Endpoints
NATS metrics endpoints are the key to understanding your message bus's health and performance, but they're often overlooked in favor of more "critical" .
NATS CLI: Publish, Subscribe, and Debug Messages
NATS isn't just a message queue; it's a distributed messaging system that can achieve sub-millisecond latency because its core design prioritizes simpli.
NATS NKeys: Decentralized Cryptographic Authentication
NKeys are NATS's cryptographic identity system, and they're not just for signing messages; they actually form the basis of NATS's entire decentralized a.
Fix NATS No Message Found on Consumer Pull
The NATS JetStream server stopped acknowledging messages that consumers were pulling, causing them to be redelivered indefinitely.
Fix NATS No Responders Available Errors
The NATS server is refusing to deliver messages because all available subscribers for a given subject have either disconnected or are otherwise unreacha.
Fix NATS No Responders on Request-Reply
The NATS Request-Reply system is failing because the NATS server is reporting that no services are listening for requests on the specified subject.
Fix NATS No Servers Available Connection Errors
Fix NATS No Servers Available Connection Errors — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
NATS Object Store: Store Large Files on JetStream
NATS Object Store is a distributed, eventually consistent key-value store that can handle large files, built on top of JetStream.
NATS Kubernetes Operator: Deploy and Manage Clusters
The NATS Kubernetes Operator lets you manage NATS clusters using Kubernetes custom resources, automating the deployment and lifecycle of NATS servers.
Fix NATS Permission Violation on Publish
The NATS server rejected your publish request because the subject you're trying to publish to is not explicitly allowed by the account or user you're au.
Fix NATS Permission Violation on Subscribe
The NATS server refused a subscribe request because the client's credentials did not grant it permission to access the specified subject.
NATS Async Publishing: Batch Publishes for Throughput
NATS doesn't actually batch your messages for you when you publish them asynchronously; it relies on your application to do it.
Fix NATS Push Consumer Requires Deliver Subject Error
The NATS JetStream push consumer is failing because it's missing the Deliver Subject configuration, which is essential for NATS to know where to send me.
NATS Queue Groups: Load Balance Subscribers
NATS queue groups don't actually load balance subscribers; they distribute messages to one subscriber per message within the group.
Fix NATS Raft Leader Election In Progress Errors
The NATS server is stuck in a "Leader Election In Progress" state because the Raft consensus group cannot agree on a leader.
NATS Request-Reply: Synchronous Messaging Pattern
The NATS Request-Reply pattern is fundamentally a way to ask a service for information and get an immediate answer, without you having to manage the "wa.
Fix NATS Sequence Mismatch Errors
A sequence mismatch error in NATS means a consumer has received messages out of the order they were published, which breaks its ability to process them .
NATS Server Config: Configure Clusters and Routes
NATS Server Config: Configure Clusters and Routes. NATS clustering isn't about redundancy; it's about distributed state. Let's see a NATS cluster in action
NATS Prometheus Exporter: Scrape Server Metrics
The NATS Prometheus exporter is a specialized tool that bridges NATS, a high-performance messaging system, and Prometheus, a popular time-series monitor.
NATS Graceful Shutdown: Drain Before Stopping Server
NATS stops accepting new connections when you tell it to shut down, but it doesn't automatically finish processing existing requests.
NATS Services API: Build Microservices Over Messaging
NATS Services API: Build Microservices Over Messaging — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
Fix NATS Slow Consumer Dropped Messages
The NATS JetStream server is dropping messages for a slow consumer because the consumer's acknowledgement ACK timeout is being exceeded.
NATS Slow Consumer Penalty: Handle and Mitigate
NATS Slow Consumer Penalty: Handle and Mitigate — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
Fix NATS Stream Source Not Found Errors
The NATS stream source is failing because the JetStream server cannot find the stream definition it's configured to use.
Fix NATS Stale Connection Errors
NATS has stopped accepting connections from your clients because the server believes the client is still connected, but the client has actually lost its.
NATS Multi-Tenancy: Isolate Clients with Accounts
NATS multi-tenancy isn't about sandboxing processes; it's about logically partitioning a single NATS server cluster into independent virtual networks th.
Fix NATS Account Not Found Errors
The NATS server is refusing connections because it can't find the account specified in the connection attempt, meaning the authentication layer is faili.
NATS Auth Callout: Dynamic Credential Verification
The NATS authentication callout mechanism lets you verify credentials dynamically by invoking an external service, making it a powerful tool for sophist.
Fix NATS Authentication Token Expired Errors
Fix NATS Authentication Token Expired Errors — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
Fix NATS Authorization Violation Errors
The NATS server is rejecting connections and messages due to insufficient permissions, preventing clients from publishing or subscribing to topics.
Fix NATS Cluster Not Available Errors
The NATS cluster is unavailable because the NATS server responsible for coordinating cluster membership has failed to start or is unable to join the exi.
Fix NATS Cluster Peer Not Found Errors
Fix NATS Cluster Peer Not Found Errors — practical guide covering nats setup, configuration, and troubleshooting with real-world examples.
NATS Clustering: Connect Servers with Routes and Gateways
NATS clustering is more than just a way to get high availability; it's a distributed system where each server is a potential single point of failure for.
Fix NATS Connection Closed Unexpectedly
The NATS client is prematurely disconnecting because the NATS server is actively closing the connection due to an unhandled exception within the server'.
NATS Connection Draining: Graceful Shutdown Guide
NATS connection draining is how a server ensures all in-flight messages are processed before a client disconnects, preventing data loss.
Fix NATS Connection Dropped and Reconnect Behavior
The NATS client library gave up on its connection to a NATS server because the underlying network socket was unexpectedly closed.
NATS JetStream: Configure Max Delivery Attempts
NATS JetStream's MaxDeliveryAttempts is actually a limit on how many times a message can be acknowledged by consumers, not how many times it's delivered.
Fix NATS Consumer Name Already in Use Error
A NATS consumer with that name already exists on the stream, preventing its creation. The core issue is that NATS JetStream enforces unique consumer nam.
Fix NATS Consumer Not Found Errors
The Consumer Not Found error means the NATS JetStream server received a request to interact with a consumer that it doesn't have any record of.