Облачная экосистема

5"

Normal Created 33s (x3 over 2m30s) kubelet, node01 Created container healtcheck

Normal Started 33s (x3 over 2m30s) kubelet, node01 Started container healtcheck

Normal Pulled 33s (x2 over 93s) kubelet, node01 Container image "alpine:3.5" already present on machine

Warning Unhealthy 3s (x9 over 2m13s) kubelet, node01 Liveness probe failed: cat: can't open '/tmp/healthy': No such file or directory

Normal Killing 3s (x3 over 2m3s) kubelet, node01 Container healtcheck failed liveness probe, will be restarted

Мы видим, что контейнер постоянно перезапускается.

controlplane $ cat << EOF > liveness.yaml

apiVersion: v1

kind: Pod

metadata:

name: liveness

spec:

containers:

– name: healtcheck

image: alpine:3.5

args:

– /bin/sh

– -c

– touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 60

livenessProbe:

exec:

command:

– cat

– /tmp/healthy

initialDelaySeconds: 15

periodSeconds: 5

EOF

controlplane $ kubectl create -f liveness.

pod/liveness created

controlplane $ kubectl get pods

NAME READY STATUS RESTARTS AGE

liveness 1/1 Running 2 2m53s

controlplane $ kubectl describe pod/liveness | tail -n 15

SecretName: default-token-9v5mb

Optional: false

QoS Class: BestEffort

Node-Selectors: < none>

Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s

node.kubernetes.io/unreachable:NoExecute for 300s

Events:

Type Reason Age From Message

–– – – – –

Normal Scheduled 3m44s default-scheduler Successfully assigned default/liveness to node01

Normal Pulled 68s (x3 over 3m35s) kubelet, node01 Container image "alpine:3.5" alre

Normal Created 68s (x3 over 3m35s) kubelet, node01 Created container healtcheck

Normal Started 68s (x3 over 3m34s) kubelet, node01 Started container healtcheck

Warning Unhealthy 23s (x9 over 3m3s) kubelet, node01 Liveness probe failed: cat: can't open '/tmp/healthy': No such file or directory

Normal Killing 23s (x3 over 2m53s) kubelet, node01 Container healtcheck failed liveness probe, will be restarted

Также мы видим и на событиях кластера, что когда cat /tmp/health терпит неудачу – контейнере пересоздаётся:

controlplane $ kubectl get events

controlplane $ kubectl get events | grep pod/liveness

13m Normal Scheduled pod/liveness Successfully assigned default/liveness to node01

13m Normal Pulling pod/liveness Pulling image "alpine:3.