CloudWiki
Resource

ReplicaSet

Kubernetes
Kubernetes
A ReplicaSet maintains a stable set of replica Pods running at any given time. As such, it is often used to guarantee the availability of a specified number of identical Pods.
Terraform Name
terraform
kubernetes_deployment
ReplicaSet
attributes:
  • replicas - (Optional) The number of desired replicas. This attribute is a string to be able to distinguish between explicit zero and not specified. Defaults to 1.
    For more info see Kubernetes reference
Associating resources with a
ReplicaSet
Resources do not "belong" to a
ReplicaSet
Rather, one or more Security Groups are associated to a resource.
Create
ReplicaSet
via Terraform:
The following HCL creates a deployment with 3 replicas
Syntax:

resource "kubernetes_deployment" "example" {
 metadata {
   name = "terraform-example"
   labels = {
     test = "MyExampleApp"
   }
 }

 spec {
   replicas = 3

   selector {
     match_labels = {
       test = "MyExampleApp"
     }
   }

   template {
     metadata {
       labels = {
         test = "MyExampleApp"
       }
     }

     spec {
       container {
         image = "nginx:1.21.6"
         name  = "example"

         resources {
           limits = {
             cpu    = "0.5"
             memory = "512Mi"
           }
           requests = {
             cpu    = "250m"
             memory = "50Mi"
           }
         }

         liveness_probe {
           http_get {
             path = "/"
             port = 80

             http_header {
               name  = "X-Custom-Header"
               value = "Awesome"
             }
           }

           initial_delay_seconds = 3
           period_seconds        = 3
         }
       }
     }
   }
 }
}

Create
ReplicaSet
via CLI:
Parametres:

apiVersion: apps/v1
kind: ReplicaSet
metadata:
 name: my-replicaset
spec:
 replicas: 3
 selector:
   matchLabels:
     app: my-app
 template:
   metadata:
     labels:
       app: my-app
   spec:
     containers:
     - name: my-container
       image: my-image:latest
       ports:
       - containerPort: 80

Example:

kubectl apply -f https://kubernetes.io/examples/controllers/frontend.yaml

aws cost
Costs
Direct Cost
Indirect Cost
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Best Practices for
ReplicaSet

Categorized by Availability, Security & Compliance and Cost

Low
Access allowed from VPN
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Low
Auto Scaling Group not in use
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Medium
Connections towards DynamoDB should be via VPC endpoints
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Medium
Container in CrashLoopBackOff state
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Low
EC2 with GPU capabilities
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Medium
EC2 with high privileged policies
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Medium
ECS cluster delete alarm
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Critical
ECS task with Admin access (*:*)
Medium
ECS task with high privileged policies
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Critical
EKS cluster delete alarm
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Medium
ElastiCache cluster delete alarm
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Medium
Ensure Container liveness probe is configured
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Medium
Ensure ECS task definition has memory limit
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Critical
Ensure EMR cluster master nodes are not publicly accessible
No items found.
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