Add a data disk to an Azure VM: attach, initialize and mount it so it survives a reboot
Create and attach a managed data disk with the Azure CLI, then partition, format and mount it on Windows and Linux so it comes back after every reboot.
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Azure Databricks managed resource group errors - deny assignments, Azure Policy and locks that break clusters
Owners get "denied by deny assignment" in the Databricks managed resource group, and policies or locks there break cluster launch and termination. Find the blocker and fix it from the supported side.
Azure Logic Apps run failed: find the failing action, fix the connection and resubmit safely
Find which action failed in a Logic Apps run, map the error to a cause, fix expired connections and throttling, then resubmit failed runs without creating duplicates.
Convert external Delta tables to Unity Catalog managed tables with SET MANAGED: prechecks, cutover and rollback
Move an external Delta table to Unity Catalog managed storage in place with ALTER TABLE SET MANAGED. Prechecks, a short write freeze, restarting streams, rollback with UNSET MANAGED and cleaning up old files.
dnf update fails on an OCI Oracle Linux instance: regional yum server, ociregion variable and service gateway checks
dnf times out or can't resolve yum$ociregion.$ocidomain on an OCI instance. Check the yum variables, DNS, the service gateway route and egress rules, then fix the one that broke.
LLM API calls fail with CERTIFICATE_VERIFY_FAILED behind a corporate proxy: CA bundles and proxy settings for the OpenAI SDK, boto3 and Azure SDKs
Fix SSL CERTIFICATE_VERIFY_FAILED and proxy connection errors when Python apps call OpenAI, Azure OpenAI or Bedrock through a TLS-inspecting corporate proxy.
PostgreSQL audit logging with pgAudit: install it, choose what to log and keep the volume under control
Enable pgAudit on self-managed PostgreSQL, Amazon RDS and Azure Flexible Server, log DDL and role changes everywhere, audit sensitive tables per object, and avoid drowning in log volume.
RDS read replica lagging or replication stopped: find the cause and fix it
ReplicaLag is climbing or stuck at -1 on an RDS read replica. Check replication state, find whether the replica is slow or broken, and fix it for MySQL and PostgreSQL.
Recover deleted EBS snapshots, AMIs and volumes with Recycle Bin retention rules
Set up Recycle Bin retention rules so deleted EBS snapshots, AMIs and volumes can be restored, lock the rules against tampering, and restore a resource from the CLI.
Redis vector search cheat sheet: FT.CREATE vector indexes, KNN and range queries, filters, aliases and index health
The redis-cli and Python commands for Redis vector indexes - create HNSW or FLAT indexes, run filtered KNN queries, check indexing failures and swap indexes with aliases.
Rotate the Airflow Fernet key without breaking connections and variables
Rotate the Fernet key that encrypts Airflow connection passwords and variables using the two-key method, verify re-encryption, and recover when tasks fail with InvalidToken.
Set up OCI Vulnerability Scanning for compute instances: policies, recipe, target and reading results
Turn on agent-based and port scanning for OCI compute instances. Covers the IAM policies, the recipe, the target and the agent plugin, then shows how to list and export the findings from the CLI.
Snowflake masking and row access policies: protect PII columns and rows by role
Set up Snowflake dynamic data masking and row access policies, use tag-based masking at scale, find which policies protect a table, and fix the errors and surprises that show up most often.
SQL Server database stuck in single-user mode (error 924): find the session holding it and restore MULTI_USER
Someone set a database to SINGLE_USER and now nobody can get in. Find the one session that holds it, take it back, and return the database to MULTI_USER safely.
Amazon Bedrock batch inference jobs fail, end PartiallyCompleted or expire: input records, IAM roles and error records
Find why a Bedrock model invocation job failed, stalled or finished with missing records, using the job message, the manifest file and per-record errors, then re-run only what failed.
Amazon SageMaker real-time endpoints CLI cheat sheet: status, test calls, variants, autoscaling, logs and metrics
AWS CLI commands for operating SageMaker real-time inference endpoints, covering status and failure reasons, test invocations, traffic shifting, autoscaling, logs and CloudWatch metrics.
Apache Iceberg with concurrent writers - a production checklist for catalogs, commit conflicts, isolation and metadata growth
Before several Spark jobs, streams and compaction write to the same Iceberg tables, check the catalog, commit retries, isolation levels, write distribution, delete modes and metadata growth.
AWS Backup jobs FAILED, EXPIRED or ABORTED: find the reason and fix the usual causes
List failed AWS Backup jobs across accounts, read the status message, fix IAM, KMS, opt-in, backup window and VSS causes, then alert on the next failure.
Azure Monitor managed Prometheus for AKS - PromQL and cardinality cheat sheet for operators
Query an Azure Monitor workspace from the CLI, find the metrics and labels that inflate active series, and keep PromQL for saturation, throttling and restarts fast at cluster scale.
Azure Resource Manager throttling at scale: 429 TooManyRequests, token buckets and finding the noisy client
Pipelines, Terraform plans and portal blades fail with 429 from management.azure.com. Read the rate-limit headers, find which client drains the bucket and move bulk reads off ARM.
Azure Windows VM not activated: fixing KMS activation errors 0xC004F074 and forced-tunnel routing
Windows VMs in Azure show "Activate Windows" or error 0xC004F074. Check the KMS settings, port 1688, DNS and forced-tunnel routes to azkms.core.windows.net, then fix them.
Checklist: giving an AI agent its own identity - scoped, short-lived credentials and an audit trail for every tool call
Agents that run on a shared service account or a user's long-lived token are hard to contain and impossible to audit. A checklist for per-agent identities, delegation, session-scoped credentials and traceable tool calls on Azure and AWS.
Databricks Asset Bundles across dev, test and prod: variables, lookups, presets and run_as done properly
Structure one bundle for several Azure Databricks workspaces. Covers complex and lookup variables, target presets, production mode, run_as service principals and adopting existing jobs.
Databricks can't import your own Python module: ModuleNotFoundError with workspace files, Git folders and sys.path
Fix ModuleNotFoundError and stale imports for your own .py files in Azure Databricks - working directory, /Workspace paths, notebooks vs files, name shadowing, executors and autoreload.
Databricks REST API 429 Too Many Requests: find the noisy caller and fix automation at scale
Runbook for 429 responses from the Azure Databricks REST API. Find the client making the calls, add backoff and client-side rate limits, and replace polling loops with system tables.
Databricks SDK for Python cheat sheet for Azure admins - auth, clusters, jobs, permissions, SQL and errors
Copy-paste Databricks SDK for Python snippets for Azure workspace operations. Covers Entra ID and OAuth auth, cluster and job control, permissions, SQL through warehouses, pagination and error handling.
dbt microbatch incremental models in production - event_time filtering, lookback, backfills and failed batches
Run large time-series dbt models with the microbatch strategy - configure event_time on parents, size batches and lookback, run targeted backfills, retry only failed batches and avoid full scans.
Delta queries slow before the first task starts: transaction log bloat, checkpoints and file counts on Azure Databricks
When a Delta query spends seconds to minutes in planning, the transaction log is usually the cause. Measure it, then shrink file counts, tombstones, per-file stats and commit frequency.
DynamoDB global tables production checklist: MREC vs MRSC, write conflicts, replication latency and regional failover
A pre-production checklist for DynamoDB global tables. Choose a consistency mode, design around last-writer-wins, keep capacity in step across replicas, monitor replication and rehearse failover.
ECS Exec cheat sheet: shell into Fargate and EC2 tasks and fix execute-command errors
Enable ECS Exec on a service, open a shell in a running container, and fix the usual errors - plugin missing, agent not running, task role and VPC endpoint gaps.
ECS tasks stuck in PROVISIONING with an Auto Scaling group capacity provider: managed scaling, termination protection and draining runbook
ECS on EC2 tasks sit in PROVISIONING and the Auto Scaling group never grows, or instances drain and never scale in. Read CapacityProviderReservation, find the blocker and fix managed scaling.
Event Hubs Capture not writing files: storage access, firewalls, empty files and backlog
Capture is on but the container is empty, full of tiny empty Avro files or hours behind. Check the config, storage access and backlog, then fix it.
ExpiredToken in long-running AWS jobs: STS session duration, the role chaining one-hour limit and credentials that refresh themselves
Batch jobs, migrations and CI pipelines die after an hour with ExpiredToken. Learn where session limits come from, why role chaining caps you at one hour, and how to make credentials refresh automatically.
Flink job upgrade runbook - stop with savepoint, keep operator UIDs stable and restore state safely
Upgrade a stateful Flink job without losing state - pin operator UIDs, stop with a savepoint, check state compatibility, restore with the right claim mode and roll back if the new version misbehaves.
Handling Azure platform maintenance inside the VM with Scheduled Events - drain, approve and recover
Use the Scheduled Events endpoint to see Freeze, Reboot, Redeploy, Preempt and Terminate events before they hit, drain the node, approve early and keep clustered workloads healthy.
Hugging Face Text Embeddings Inference (TEI) cheat sheet: images, launch flags, batching limits, API calls and metrics
The TEI commands and flags you reach for when running self-hosted embedding and reranker models - picking the right image, sizing batches, calling /embed and /rerank, and reading metrics.
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