git push 'error: RPC failed; HTTP 413': How to Find the Cause and Fix It
Why git push fails with 'RPC failed; HTTP 413' (a server/proxy body limit or a large file), how to confirm it with GIT_TRACE_CURL and cat-file, and how to fix it with an nginx limit, an amended commit, Git LFS or filter-repo. Every command was reproduced in a local sandbox.
Node.js error:0308010C digital envelope unsupported — a fix runbook
Did a Node 17/18/20 upgrade break your webpack build with error:0308010C digital envelope routines unsupported and ERR_OSSL_EVP_UNSUPPORTED? This copy-paste runbook covers a 30-second diagnostic table, the --openssl-legacy-provider workarou
Cannot use import statement outside a module: 30-Second Diagnostic Chart + Fix Runbook
Pinpoint Cannot use import statement outside a module, ERR_REQUIRE_ESM, and require is not defined in 30 seconds with a diagnostic chart, then fix them with copy-paste snippets. A practical runbook covering package.json type through ts-node
Fixing address already in use: Find and kill the process occupying the port (EADDRINUSE)
When bind: address already in use or EADDRINUSE leaves you stuck, this guide walks through finding the occupying process with lsof and netstat, terminating it safely, and stopping TIME_WAIT and duplicate startups with copy-paste commands fo
How to Diagnose the Root Cause of Istio L7 503 Errors in 3 Steps: From Sidecar to Policy
L7 communication errors such as 503s in Istio are hard to diagnose with ordinary network tools. This guide presents a systematic 3-step diagnostic roadmap—from sidecar behavior, through reverse-tracing VirtualService and AuthorizationPolicy
Docker "Cannot connect to the daemon" Error: Diagnosing and Fixing 5 Causes
The "Cannot connect to the Docker daemon" error when you run `docker ps` is not a simple failure—it is one of five patterns such as a stopped daemon, missing permissions, or a context mismatch. Use this guide's diagnostic table and recovery
How to Fix the Helm "another operation in progress" Error (Pending Lock)
Is your deploy stuck on Helm's "another operation in progress" error? Diagnose with helm history, unlock via helm rollback or deleting the pending Secret, and prevent recurrence with --atomic—copy-paste commands included.
How to Fix npm ERR! code ELIFECYCLE — Diagnose errno 1, 134, and SIGKILL by Cause
npm ERR! code ELIFECYCLE is a wrapper error, not the real cause. Classify errno 1, 134, SIGKILL, and ENOENT in five seconds with a table, then fix build, start, test, and CI failures with copy-paste commands.
Gradle "Could not resolve dependencies" Error: 6 Cause-by-Cause Fixes
Fix Gradle "Could not resolve dependencies" and "Could not find artifact" errors in 5 minutes with diagnostic commands and copy-paste snippets for six causes: repositories, authentication, proxy, SSL, cache, and multi-module.
How to Fix HikariPool-1 Connection is not available 30000ms
Diagnose the "HikariPool-1 Connection is not available, request timed out after 30000ms" error by its five root causes. Includes a pool-stats reading table, copy-paste application.yml settings, and how to detect connection leaks.
5 Fixes for Spring Boot's 'url attribute is not specified' Error
Diagnose the five causes of Spring Boot's 'Failed to configure a DataSource: url attribute is not specified' startup error, and fix it in 5 minutes with copy-paste MySQL, PostgreSQL, and H2 configs.