[Kubernetes] Lệnh Kubernetes hay quên

1. Exec vào pod.

kubectl exec --stdin --tty prometheus-prometheus-grafana-stack-k-prometheus-0 -n monitoring sh

2. Check listen port

kubectl exec <pod name here> -- netstat -tulpn | grep "search string"

3. Fix lỗi command permission denied trong pod.

Nếu bạ thực hiện 1 lệnh nhưng gặp lỗi trả về như dưới.

$ kubectl exec prometheus-prometheus-grafana-stack-k-prometheus-0 -n monitoring -- ping prometheus-prometheus-grafana-stack-k-prometheus-0
PING prometheus-prometheus-grafana-stack-k-prometheus-0 (10.244.194.100): 56 data bytes
ping: permission denied (are you root?)
command terminated with exit code 1

Cách mình sử dụng là check listen port thay cho icmp

$ kubectl exec prometheus-prometheus-grafana-stack-k-prometheus-0 -n monitoring -- netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 :::9090                 :::*                    LISTEN      1/prometheus
tcp        0      0 :::8080                 :::*                    LISTEN      -

Hoặc sử dụng telnet.

$ kubectl exec prometheus-prometheus-grafana-stack-k-prometheus-0 -n monitoring -- telnet 8.8.8.8 443
Connected to 8.8.8.8