Skip to content

Ravi Sir's Cards › DevOps

Chapter 42: Terraform Drift and Troubleshooting: Cards

मराठी cards · Open the chapter

Revision cards

Drift: when AWS no longer matches the code. Hand changes in the console make the code lie about what is running, and the next apply may undo them by surprise. — Revision card 1 of 3: Drift: when AWS no longer matches the code · Download PNG · Open card page

Lesson: 42.1 Drift — when AWS no longer matches the code

Troubleshooting with TF_LOG. Some errors give one short line. You need more detail to see which API call failed. — Revision card 2 of 3: Troubleshooting with TF_LOG · Download PNG · Open card page

Lesson: 42.2 Troubleshooting with TF_LOG and the common errors

Troubleshooting table: error, cause, fix. The same handful of errors make up most Terraform failures. Knowing them saves hours. — Revision card 3 of 3: Troubleshooting table: error, cause, fix · Download PNG · Open card page

Lesson: 42.3 Troubleshooting table — error, cause, fix

Interview cards

What is drift, and how do you handle it? Drift is when real cloud resources differ from Terraform state and code, usually after a manual change. Detect it with terraform plan or plan -refresh-only. — Interview card 1 of 3: What is drift, and how do you handle it? · Download PNG · Open card page

Lesson: 42.1 Drift — when AWS no longer matches the code

How do you get more detail when Terraform fails? Set TF_LOG=DEBUG (or TRACE) and TF_LOG_PATH=tf.log, then re-run. The log shows provider API calls and errors. — Interview card 2 of 3: How do you get more detail when Terraform fails? · Download PNG · Open card page

Lesson: 42.2 Troubleshooting with TF_LOG and the common errors

Terraform says “Error acquiring the state lock”. What do you do? Another run holds the lock, or a crashed run left it. First check if someone or a pipeline is running. Only if the run is definitely dead, use terraform force-unlock LOCK_ID. — Interview card 3 of 3: Terraform says “Error acquiring the state lock”. What do you do? · Download PNG · Open card page

Lesson: 42.3 Troubleshooting table — error, cause, fix

Comparison cards

Drift vs code change. Both make plan show changes.Drift: the real cloud changed outside Terraform.Code change: someone edited the .tf files. — Comparison card 1 of 3: Drift vs code change · Download PNG · Open card page

Lesson: Chapter 42: Terraform Drift and Troubleshooting

TF_LOG=DEBUG vs TF_LOG=TRACE. Both turn on detailed Terraform logs.DEBUG: detailed.TRACE: the most detailed, every step. — Comparison card 2 of 3: TF_LOG=DEBUG vs TF_LOG=TRACE · Download PNG · Open card page

Lesson: Chapter 42: Terraform Drift and Troubleshooting

Wait for the lock vs force-unlock. Wait: let the other run finish (or use -lock-timeout=5m).force-unlock: remove the lock by hand. — Comparison card 3 of 3: Wait for the lock vs force-unlock · Download PNG · Open card page

Lesson: Chapter 42: Terraform Drift and Troubleshooting