diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c93932d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.vagrant
+*.crt
diff --git a/.yamllint.yaml b/.yamllint.yaml
new file mode 100644
index 0000000..14d3740
--- /dev/null
+++ b/.yamllint.yaml
@@ -0,0 +1,12 @@
+---
+extends: default
+
+rules:
+  indentation:
+    spaces: 2
+    indent-sequences: true
+    check-multi-line-strings: false
+  brackets:
+    forbid: true
+  line-length:
+    max: 120
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f06407c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+lint-yaml:
+	find . -type f -name '*.yaml' | xargs yamllint
diff --git a/Vagrantfile b/Vagrantfile
old mode 100755
new mode 100644
index a621081..642cd7a
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -13,6 +13,14 @@ env = YAML.load_file('environment.yaml')
 # Limitando apenas a ultima versao estavel do Vagrant instalada
 Vagrant.require_version '>= 2.0.0'
 
+SCRIPT = <<-EOF
+echo 'unattended-upgrades unattended-upgrades/enable_auto_updates boolean false' | sudo debconf-set-selections
+apt-get update
+apt-get upgrade -y
+apt-get autoremove -y
+dpkg-reconfigure -f noninteractive unattended-upgrades
+EOF
+
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   # Iteracao com os servidores do ambiente
   env.each do |env|
@@ -20,15 +28,25 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
       srv.vm.box      = env['box']
       srv.vm.hostname = env['hostname']
       srv.vm.network 'private_network', ip: env['ipaddress']
+
       if env['additional_interface'] == true
         srv.vm.network 'private_network', ip: '1.0.0.100',
           auto_config: false
       end
+
+      srv.vbguest.auto_update = true
+
       srv.vm.provider 'virtualbox' do |vb|
         vb.name   = env['name']
         vb.memory = env['memory']
         vb.cpus   = env['cpus']
+        vb.linked_clone = true
       end
+
+      srv.vm.provision 'shell',
+        inline: SCRIPT,
+        env: {DEBIAN_FRONTEND: 'noninteractive'}
+
       srv.vm.provision 'ansible_local' do |ansible|
         ansible.playbook           = env['provision']
         ansible.install_mode       = 'pip'
diff --git a/aula04/rbac/analista-rbac.yaml b/aula04/rbac/analista-rbac.yaml
new file mode 100644
index 0000000..47a82a3
--- /dev/null
+++ b/aula04/rbac/analista-rbac.yaml
@@ -0,0 +1,110 @@
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: namespace-lister
+rules:
+  - apiGroups:
+      - ""
+    resources:
+      - namespaces
+    verbs:
+      - list
+      - get
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: namespace-lister
+subjects:
+  - kind: User
+    name: analista
+    apiGroup: rbac.authorization.k8s.io
+roleRef:
+  kind: ClusterRole
+  name: namespace-lister
+  apiGroup: rbac.authorization.k8s.io
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: analista
+  namespace: 4labs
+rules:
+  - apiGroups:
+      - ""
+    resources:
+      - pods
+      - services
+      - services/proxy
+      - configmaps
+      - secrets
+      - replicationcontrollers
+      - events
+      - pods/portforward
+      - pods/exec
+      - pods/log
+      - endpoints
+      - persistentvolumeclaims
+    verbs:
+      - get
+      - list
+      - create
+      - update
+      - patch
+      - delete
+      - watch
+  - apiGroups:
+      - apps
+    resources:
+      - deployments
+      - deployments/scale
+      - replicasets
+      - daemonsets
+      - statefulsets
+    verbs:
+      - get
+      - list
+      - create
+      - update
+      - patch
+      - delete
+      - watch
+  - apiGroups:
+      - autoscaling
+    resources:
+      - horizontalpodautoscalers
+    verbs:
+      - get
+      - list
+      - create
+      - update
+      - patch
+      - delete
+      - watch
+  - apiGroups:
+      - batch
+    resources:
+      - jobs
+      - cronjobs
+    verbs:
+      - get
+      - list
+      - create
+      - update
+      - patch
+      - delete
+      - watch
+  - apiGroups:
+      - networking.k8s.io
+    resources:
+      - ingresses
+      - networkpolicies
+    verbs:
+      - get
+      - list
+      - create
+      - update
+      - patch
+      - delete
+      - watch
diff --git a/environment.yaml b/environment.yaml
old mode 100755
new mode 100644
index 4eef084..85cbdfd
--- a/environment.yaml
+++ b/environment.yaml
@@ -1,4 +1,12 @@
 ---
+- name: kube-infra
+  box: devopsbox/ubuntu-20.04
+  hostname: kube-infra
+  ipaddress: 172.16.1.103
+  memory: 512
+  cpus: 1
+  provision: provision/ansible/kube-infra.yaml
+
 - name: kube-master
   box: devopsbox/ubuntu-20.04
   hostname: kube-master
@@ -22,11 +30,3 @@
   memory: 2560
   cpus: 2
   provision: provision/ansible/kube-node2.yaml
-
-- name: kube-infra
-  box: devopsbox/ubuntu-20.04
-  hostname: kube-infra
-  ipaddress: 172.16.1.103
-  memory: 512
-  cpus: 1
-  provision: provision/ansible/kube-infra.yaml