DevOps: What is the kubectl logs?

1# Pod logs
2kubectl logs pod_name
3kubectl logs pod_name -c container_name  # Multi-container
4kubectl logs pod_name --previous  # Previous container
5kubectl logs pod_name -f  # Follow (tail -f)
6kubectl logs pod_name --tail=100  # Last 100 lines
7kubectl logs pod_name --since=1h  # For the last hour
8kubectl logs pod_name --timestamps  # With timestamps
9
10# Deployment logs
11kubectl logs deployment/myapp
12kubectl logs -l app=myapp --all-containers  # All pods with label
13
14# Filtered logs
15kubectl logs pod_name | grep ERROR
16kubectl logs pod_name | grep -i "error|warning"
17kubectl logs pod_name | head -20
18kubectl logs pod_name | tail -20
19
20# Logs to file
21kubectl logs pod_name > pod_logs.txt 2>&1