• kubernetes: pod restart policy

  2 min read

  
  

  When defining objects that contain a pod template (such a Deployment or a Job) but also when defining a plain pod we can control under which circumstances a pod will be restarted

  The container restart policy can be controlled using restartPolicy on the spec at the same level where we define the containers:

  apiVersion: batch/v1
  kind: Job
  metadata:
    name: demo-restartPolicy-job
  spec:
    backoffLimit: 2
    template:
      metadata:
        name: demo-restartPolicy-pod
      spec:
        containers:
        - name: demo
          image: sonarsource/sonar-scanner-cli
        restartPolicy: Never  
  

  01/06/2021

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• psql: Get the time it took a query to complete

  1 min read

  If you need to known the amount of time it took a query to complete on PostgreSQL, you can use the \timing function that psql has

  31/05/2021

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• terraform: Using dynamic blocks to conditionally set a block on a resource

  2 min read

  
  

  In the same way we can conditionally include a resource, we can also use for_each to conditionally include a nested block using terraform's dynamic blocks

  For example, if we want to add a variable that controls whether we should set this value:

  resource "helm_release" "spinnaker" {
    name  = "spinnaker"
  
    (...)
  
    set {
      name = "halyard.additionalScripts.data.enable_mptv2"
      type = "string"
      value = <<-EOF
        #!/bin/sh
        cat $0
        echo "custom mptv2"
        $HAL_COMMAND config features edit --managed-pipeline-templates-v2-ui true
      EOF
    }
  }
  

  28/05/2021

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• Terraform dynamic blocks

  3 min read

  
  

  When we have a resource that can have multiple nested blocks to be configured we can use dynamic blocks to configure it dynamically. A perfect example is a SecurityGroup that can have multiple ingress and egress rules to be able to allow traffic. Let's use the following aws_security_group resource definition as a starting point:

  resource "aws_security_group" "demo_sg" {
    name = "demo_sg"
    description = "pet2cattle demo SG with dynamic blocks"
    vpc_id = aws_vpc.main.id
  
    ingress {
      from_port        = 443
      to_port          = 443
      protocol         = "tcp"
      cidr_blocks      = [aws_vpc.main.cidr_block]
    }
  
    egress {
      from_port        = 0
      to_port          = 0
      protocol         = "-1"
      cidr_blocks      = ["0.0.0.0/0"]
    }
  }
  

  27/05/2021

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• Auto-upgrade k3s using the system-upgrade-controller

  3 min read

  
  

  A kubernetes cluster can get outdated pretty soon since Kubernetes keeps evolving at every release. If we have a k3s cluster we can use the system-upgrade-controller for automatically handling the upgrades. Let's take a look on how to configure it

  26/05/2021

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