Docker Container Healthcheck Stuck in "Starting" State
A container permanently stuck showing "health: starting" rather than transitioning to either "healthy" or "unhealthy" usually means the healthcheck command...
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Docker Container Unable to Resolve External Domain Names (DNS Failure)
A container that can reach the internet by IP but fails to resolve external domain names points specifically at DNS configuration inside the container —...
Rate Limit 429 Too Many Requests Bypass During Load Testing
Getting rate-limited while load testing your own API is expected behavior — the rate limiter is doing its job — and the correct fix is configuring a...
MySQL Collation Mismatch "Illegal Mix of Collations" in JOIN
The "Illegal mix of collations" error means you're comparing or joining two text values that use different collations (sorting/comparison rules) — MySQL...
MySQL "Lock Wait Timeout Exceeded" Try Restarting Transaction
"Lock wait timeout exceeded" is different from a deadlock — it means your transaction waited the full configured timeout for a lock held by another...
Linux Process Killed Automatically by System (Out of Memory)
A process that just stops running with no crash log, no error message, and no obvious cause is often a strong sign of the Linux kernel's OOM (Out of Memory)...
Linux SSH Connection Hangs on "Authenticating" or Drops Frequently
An SSH connection that hangs specifically during authentication, or that drops unexpectedly after connecting successfully, usually traces back to one of a...
Nginx 504 Gateway Timeout on Long-Running API Request
A 504 Gateway Timeout on a request that's legitimately slow (a large report generation, a heavy computation, a batch operation) means Nginx gave up waiting for...
Nginx proxy_pass Stripping URL Path Prefix Unexpectedly
Whether proxy_pass strips the matched location prefix from the URL before forwarding to the upstream depends on a small, easy-to-miss detail in how the...