Amazon MSK

Overview

Domain expertise for operating Amazon MSK Provisioned clusters with Standard and Express broker types. Covers performance troubleshooting, consumer lag diagnosis, storage management, cluster sizing, client configuration, and CloudWatch monitoring.

Execute commands using available tools from the AWS MCP server when connected — it provides sandboxed execution, audit logging, and observability. When the MCP server is not available, fall back to the AWS CLI or shell as needed.

Standard brokers use customer-managed EBS volumes for storage. You choose instance types (kafka.m5/m7g families), provision EBS, and manage storage scaling.

Express brokers use instance types prefixed with express.m7g and are the default recommendation for almost all MSK workloads — they typically cost less, not just less effort. Up to 3x ingress per broker (MSK Express broker types) means fewer brokers for the same load, and storage is billed per GB-hour on data actually retained rather than provisioned up front on EBS that cannot shrink. They also scale 20x faster, rebalance partitions 180x faster (Intelligent Rebalancing), recover 90% quicker (MSK Express broker types), and have no maintenance windows. Express brokers have NO customer-managed EBS — do NOT recommend EBS expansion or provisioned throughput for Express clusters. Express brokers enforce fixed replication factor of 3 and min.insync.replicas=2. See size-and-choose-cluster.md for the full Standard vs Express decision framework.

Which Workflow Do You Need?

Determine the broker type first: aws kafka describe-cluster-v2 --cluster-arn <arn>. Check Provisioned.BrokerNodeGroupInfo.InstanceType — if it starts with express., it is an Express cluster.

Customer Intent	Reference
High CPU, high latency, slow cluster, traffic shaping	troubleshoot-performance.md
Consumer lag increasing, rebalance storms, stuck consumer groups	troubleshoot-consumer-lag.md
Disk filling up, retention planning, tiered storage	manage-storage.md
Choosing Standard vs Express, sizing a cluster, partition limits, broker count, monthly cost	size-and-choose-cluster.md
Producer/consumer configuration, IAM/SCRAM/TLS auth	configure-clients.md
Creating/applying MSK configurations (server.properties); custom domain names on brokers via custom.advertised.listeners (advertised listeners, static/custom bootstrap endpoint) — validation rules, apply/rollback, scaling; migrating from the dynamic per-broker kafka-configs.sh override to the static property	configure-cluster.md
Client-side connectivity for a custom domain: NLB + ACM certificate + Route 53 fronting, TLS handshake/termination, mTLS through an NLB, cross-zone load balancing	configure-clients.md (Custom Domain Name Connectivity section)
Setting up monitoring, dashboards, alarms	monitor-and-alarm.md
Full CloudWatch metric list (Standard or Express)	Prefer monitor-and-alarm.md for strategic recommendations and how to interpret metrics, only search documentation if you need to understand a metric not included in this reference file (MSK Standard CloudWatch Metrics, MSK Express CloudWatch Metrics) for full list
Rolling restart impact, patching, maintenance resilience	maintenance-operations.md
Deliver streaming data to Apache Iceberg tables on S3 Tables with low cost in a fully managed service (Streaming Tables) — setup, IAM, schema, create/update/delete/list/describe channels	streaming-tables.md
Deliver topic data to S3 bucket as JSON/ByteArray/String objects with low cost in a fully managed service (Data Delivery for General Purpose S3 buckets) — setup, IAM, output key templates, create/update/delete/list/describe channels	data-delivery-for-general-purpose-s3.md
Build a lakehouse / data lake from Kafka; make streaming data queryable in Athena	streaming-tables.md
Alternative to Kafka Connect S3 Sink or Amazon Data Firehose for MSK; zero-ops streaming delivery to S3	data-delivery-for-general-purpose-s3.md
Streaming Tables / Data Delivery CloudWatch metrics and alarms, DLQ errors, failed deliveries, channel state transitions, freshness lag	streaming-tables-troubleshooting.md
"Can I use Streaming Tables / Data Delivery on MSK Serverless / Standard brokers?" — eligibility routing	streaming-tables.md (answer is always: Express brokers only, use Firehose, Flink, or Kafka Connect for Standard and Serqverless - Firehose integration for Amazon MSK)
What are the current supported Kafka versions for MSK?	Supported Apache Kafka versions
Does MSK support KRaft clusters, and how do I migrate between ZooKeeper and KRaft mode clusters?	zk-to-kraft-migration.md
What are the current quotas for MSK Express (ingress, egress, partitions, broker count, etc.)?	MSK Express Quotas
What are the current quotas for MSK Standard (partitions, broker count, etc.)?	MSK Standard Quotas, and MSK Standard best practices for partition count limits
What broker-level configuration changes can I make on MSK Express or Standard brokers?	MSK Configuration

Available scripts

• scripts/msk_sizing.py — MUST be run for any sizing question (broker count, instance choice, cost). See size-and-choose-cluster.md for the required workflow and script reference.

Guardrail — where this skill's own files live (MCP vs local install)

This skill can be loaded two ways, and they resolve the skill's own bundled files — the references/ documents and the scripts/ files from different places. Determine how the skill was loaded before you read a reference or run a script:

• Loaded through the AWS MCP retrieve_skill tool call. The skill is not installed on the local filesystem; its reference files and scripts do not exist on disk. You MUST fetch each reference or script through the same retrieve_skill tool by passing the file parameter (for example, file="references/configure-clients.md" or file="scripts/msk_sizing.py"), and run a script from the content that tool returns. Do NOT file_read these paths from the local or working directory, and do NOT search the filesystem for them — they are not there, and any local file that happens to match the name is unrelated to this skill.
• Installed locally (the skill lives in a local skills directory such as .claude/skills/managing-amazon-msk/, ~/.claude/skills/managing-amazon-msk/, or .kiro/skills/managing-amazon-msk/). Read references and run scripts from the local skill directory using the relative paths shown throughout this documentation.

This distinction applies only to the skill's own packaged files. Every artifact created during a session or supplied by users are read from and written to the user's working directory regardless of how the skill was loaded. Never fetch or write customer data through retrieve_skill.

Common Workflows

Create/apply Amazon MSK configurations and set custom domain names — creating an Amazon MSK configuration (server.properties with the fileb:// real-newline requirement), applying it with update-cluster-configuration, and setting broker custom domain names via custom.advertised.listeners: see configure-cluster.md. For the NLB/certificate/DNS connectivity that fronts a custom domain, see configure-clients.md.