• How to create Composite Resources with Crossplane

    5 min read

    crossplane kubernetes aws

    With Crossplane we define Composite resources as the combination of other resources. Let's take a look on how to do this we are going to take some terraform code, tranform it into Crossplane objects and the create a Composition based on them

    16/03/2022

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  • How to mount a host directory on minikube

    2 min read

    minikube mount host directory

    To be able to test Kubernetes applications, minikube is a great tool: You can create an ephemeral Kubernetes cluster to test whatever is needed and delete it as easily as it was created. Futhermore, since it can use your computer's resources you won't get billed as you would if you'd choose to use a cloud provider.

    Another advantage is that we can make available local directories to the cluster using minikube mount

    14/03/2022

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  • Kubernetes running out of Pods

    2 min read

    kubernetes OutOfpods

    If you try to run too many pods on a handful of nodes you might eventually run out of available Pods. Using kubectl get pods you'll see them marked with the status OutOfpods:

    $ kubectl get pods
(...)
test          deploy-test-84b4fdcbbd-59hvf            0/1     ContainerCreating   0                44s
test          deploy-test-84b4fdcbbd-7dvs9            0/1     OutOfpods           0                62s
test          deploy-test-84b4fdcbbd-btrwz            0/1     OutOfpods           0                4m16s
test          deploy-test-84b4fdcbbd-gpkkg            0/1     OutOfpods           0                91s
test          deploy-test-84b4fdcbbd-hbbdv            0/1     OutOfpods           0                67s
test          deploy-test-84b4fdcbbd-j75x4            0/1     OutOfpods           0                68s
test          deploy-test-84b4fdcbbd-s4qzz            0/1     OutOfpods           0                64s
(...)

    11/03/2022

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  • Troubleshooting a Pod by changing it's command

    3 min read

    kubernetes Pod troubleshooting

    When a container in a Pod is crashing sometimes it's logs are not enough to fully understand what's going on. One way to approach this situation the command it runs to something that won't make Kubernetes restart the container: For example a sleep command

    08/03/2022

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  • The activeDeadlineSeconds property on a Pod definition

    3 min read

    kubernetes activeDeadlineSeconds Pod Job

    If we take a look all the possible properties for a Pod definition we might notice that there's one to limit the time a Pod can be running:

    apiVersion: v1
kind: Pod
metadata:
  name: test
spec:
  activeDeadlineSeconds: 10
  containers:
  - args:
    - sleep
    - 24h
    image: alpine
    name: test

    07/03/2022

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Kubernetes:
container orchestration
kubernetes
tags related to this category
Linkerd Argo Rollouts Rollouts Capsule Pod MutatingAdmissionPolicy MutatingAdmissionPolicyBinding kind kubectl plugin custom command Argo Workflows CronWorkflow StatefulSet Workflow Kaniko WorkflowTemplate install kubernetes security Pod Security Standards port-forward socat operator-sdk golang Pushgateway RBAC Rule troubleshooting APIRequestCount affinity topologySpreadConstraints Route ExternalSecret Secret jsonpath ServiceAccount Ingress k3s letsencrypt tcpdump ssh CRD additionalPrinterColumns Velero query PV Operator Role ClusterRole web-console operator oc-mirror Secrets Manager tekton context Policy enforcement Rules Project ConfigMap Environment ROSA IngressRoute redirect RDS psql API server S3 patch file apply selector minikube arm64 colima EKS-connector SecurityContextConstraint SecretStore scripting CRC credentials Deployment valueFrom setup helm StorageClass tagging EBS externalDNS ALB HPA convert API version example shipwright ECR imagePullSecrets ENI subnet krew blame cloud provider etcd availability zones CoreDNS backend state podAntiAffinity Composite images GKE activeDeadlineSeconds Job lifetime bestby IRSA label annotation PersistentVolume Volume fsGroup vpa cluster autoscaler Karpenter provider kubernetes_manifest fsGroupChangePolicy container escape spot instances termination handler persistentVolumeReclaimPolicy fieldPath upgrade privileged network NetworkPolicy bash ps longhorn ASCP QoD raspberry pi drain evict uncordon kubeconfig config view logs admission controller hook postStart preStop deprecations gp3 get-all taints securityGroup probe readinessProbe livenessProbe tolerations explain MutatingWebhook startupProbe RollingUpdate Recreate PDB emptyDir netstat ss autoscale Kubeconfig initContainers DNS tree DaemonSet stern tail LimitRange resource limits restartPolicy system-upgrade-controller rolling update history undo Volumes awsElasticBlockStore change-cause set image imperative hostAliases imagePullPolicy metrics-server Service overlay agent nodes declarative ELB HTTPS alpine package nodeSelector scheduler kubie api-versions events multiple containers SecretKeyRef ReplicaSet NodePort Pod restart rollout deployment nginx-contoller ValidatingWebhookConfiguration error recovery httpHeaders uid securityContext exec interactive LoadBalancer IAM scale replicas nodeName externalName namespace Cronjob multinode template yaml unused-volumes diff