Descomplicando Kubernetes - Dia 02
Deploy do pod
Inicialmente precisamos subir o cluster com kind, seguindo as instruções do dia-01.
Com o cluster rodando, podemos fazer o deploy do nosso pod usando o comando:
kubectl apply -f pod.yml
Veja os detalhes do pod criado usando o comando:
kubectl describe pods
No resultado precisamos garantir que:
- Os containers
nginx,echoeshellexistam - Limites de recursos existam
- O container
nginxtenha um novo volume no caminho/opt/nginx
Esse é um exemplo do resultado gerado
Name: podsmania
Namespace: default
Priority: 0
Service Account: default
Node: dk8s-day-001-worker/172.21.0.4
Start Time: Wed, 15 May 2024 20:46:58 +0000
Labels: run=podsmania
service=webserver
Annotations: <none>
Status: Running
IP: 10.244.2.7
IPs:
IP: 10.244.2.7
Containers:
nginx:
Container ID: containerd://88dc17958d8239662a337239b354d54e93e83e085fec6314509810b83b8ac7f5
Image: nginx
Image ID: docker.io/library/nginx@sha256:a484819eb60211f5299034ac80f6a681b06f89e65866ce91f356ed7c72af059c
Port: <none>
Host Port: <none>
State: Running
Started: Wed, 15 May 2024 20:47:00 +0000
Ready: True
Restart Count: 0
Limits:
cpu: 500m
memory: 128Mi
Requests:
cpu: 300m
memory: 96Mi
Environment: <none>
Mounts:
/opt/nginx from custom-nginx-opt (rw)
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-6s7g9 (ro)
echo:
Container ID: containerd://6160153c3a075864a8cbbd54a0d9544c87ae1e9b75f2282919422e65f2e7113a
Image: ealen/echo-server
Image ID: docker.io/ealen/echo-server@sha256:ec8a6e95890df937a1eb5fafca033a32172d4f43c1fea1f302931d5f230a137f
Port: <none>
Host Port: <none>
State: Running
Started: Wed, 15 May 2024 20:47:02 +0000
Ready: True
Restart Count: 0
Limits:
cpu: 500m
memory: 128Mi
Requests:
cpu: 250m
memory: 96Mi
Environment:
PORT: 3000
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-6s7g9 (ro)
shell:
Container ID: containerd://5bccc9905d38438ee05954cdb2e7283dfdb6e1a95ce7c260740887a13ee1ef64
Image: ubuntu
Image ID: docker.io/library/ubuntu@sha256:3f85b7caad41a95462cf5b787d8a04604c8262cdcdf9a472b8c52ef83375fe15
Port: <none>
Host Port: <none>
Args:
sleep
infinity
State: Running
Started: Wed, 15 May 2024 20:47:04 +0000
Ready: True
Restart Count: 0
Limits:
cpu: 250m
memory: 96Mi
Requests:
cpu: 100m
memory: 32Mi
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-6s7g9 (ro)
Conditions:
Type Status
PodReadyToStartContainers True
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
custom-nginx-opt:
Type: EmptyDir (a temporary directory that shares a pod's lifetime)
Medium:
SizeLimit: 256Mi
kube-api-access-6s7g9:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: Burstable
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 18m default-scheduler Successfully assigned default/podsmania to dk8s-day-001-worker
Normal Pulling 18m kubelet Pulling image "nginx"
Normal Pulled 18m kubelet Successfully pulled image "nginx" in 1.481s (1.481s including waiting)
Normal Created 18m kubelet Created container nginx
Normal Started 18m kubelet Started container nginx
Normal Pulling 18m kubelet Pulling image "ealen/echo-server"
Normal Pulled 18m kubelet Successfully pulled image "ealen/echo-server" in 1.86s (1.86s including waiting)
Normal Created 18m kubelet Created container echo
Normal Started 18m kubelet Started container echo
Normal Pulling 18m kubelet Pulling image "ubuntu"
Normal Pulled 18m kubelet Successfully pulled image "ubuntu" in 1.597s (1.597s including waiting)
Normal Created 18m kubelet Created container shell
Normal Started 18m kubelet Started container shell
Limpando o deploy
Para remover o pod criado, executamos o comando:
kubectl delete -f pod.yml