feat(day-03): add instructions for third day

README.md

@@ -29,6 +29,7 @@ kubectl 1.29.4
 
 * [dia-01][dia-01]: subindo primeiro _cluster_ com [`kind`][kind] e fazendo _deploy_ do primeiro `pod`
 * [dia-02][dia-02]: realizando _deploy_ de `pod` com múltiplos _containers_, definição de volume e limitação de recursos
+* [dia-03][dia-03]: criando `namespace` e `deployment` em conjunto com estratégias de _rollout_
 
 Pode ser seguido em no 
 
@@ -37,3 +38,4 @@ Pode ser seguido em no
 [kind]: https://kind.sigs.k8s.io/
 [dia-01]: ./day-001/README.md
 [dia-02]: ./day-002/README.md
+[dia-03]: ./day-003/README.md

day-003/README.md

@@ -0,0 +1,42 @@
+# Descomplicando `kubernetes` - Dia 03
+
+## Criar `namespace`
+
+Podemos criar nosso primeiro `namespace` manualmente, usando o comando:
+
+```bash
+kubectl create namespace <namespace-name>
+```
+
+Ou, a partir de um manifesto `yaml`:
+
+```bash
+kubectl apply -f <namespace-definition>.yml
+```
+
+No nosso _cluster_ criaremos o primeiro `namespace` utilizando o arquivo [`namespace.yml`][namespace-config].
+
+## _Deploy_ do `nginx`
+
+Além dos recursos de definição do `pod` vistos nos dias [01][day-001-pod] e
+[02][day-002-pod]. Podemos definir detalhes adicionais usando o [`deployment.yml`][deployment-config].
+
+O _deploy_ do `nginx` será feito usando o comando:
+
+```bash
+kubectl apply -f deployment.yml
+```
+
+Nele definimos o:
+
+1. Número de _replicas_ do serviço
+2. Estrategia de _rollout_ do _deploy_
+3. Detalhes dos _containers_ a serem executados
+
+[Voltar para o `README`][readme]
+
+[namespace-config]: ./namespace.yml
+[day-001-pod]: ../day-001/pod.yml
+[day-002-pod]: ../day-002/pod.yml
+[deployment-config]: ./deployment.yml
+[readme]: ../README.md

day-003/created-deployment.yml

@@ -0,0 +1,26 @@
+---
+# Created with:
+# kubectl create deployment nginx-create-deployment --image nginx --replicas 3 --dry-run=client -o yaml > created-deployment.yml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  creationTimestamp: null
+  labels:
+    app: nginx-create-deployment
+  name: nginx-create-deployment
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx-create-deployment
+  strategy: {}
+  template:
+    metadata:
+      creationTimestamp: null
+      labels:
+        app: nginx-create-deployment
+    spec:
+      containers:
+      - image: nginx
+        name: nginx
+        resources: {}

day-003/deployment.yml

@@ -0,0 +1,35 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: nxing-deployment
+    minion: banana
+  name: nginx-deployment
+  namespace: application
+spec:
+  replicas: 30
+  selector:
+    matchLabels:
+      app: nginx-deployment
+  strategy:
+    # type: Recreate
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: 25%
+      maxUnavailable: 25%
+  template:
+    metadata:
+      labels:
+        app: nginx-deployment
+    spec:
+      containers:
+        - image: 'nginx:1.21.0'
+          name: server
+          resources:
+            limits:
+              cpu: '0.5'
+              memory: '256Mi'
+            requests:
+              cpu: '0.3'
+              memory: '64Mi'

day-003/namespace.yml

@@ -0,0 +1,5 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: application