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Kubernetes

32 posts, newest first.

20255

Kubernetes17 Jun 2025MySQL Pod Recovery on MicroK8s: InnoDB Crash Recovery and Forced RecoveryRecover a MySQL pod that restarts in a loop on MicroK8s: read the InnoDB error, fix permissions and disk, use innodb_force_recovery safely to dump data, and rebuild a clean instance.

MicroK8s 1.32
MySQL 8.4 LTS
InnoDB

Kubernetes20 May 2025MongoDB Pod Recovery on MicroK8s: Unclean Shutdown, Repair and ResyncBring back a MongoDB pod that crashes after a node reboot or full disk on MicroK8s: read the WiredTiger error, repair or resync the member, and avoid the mistakes that destroy data.

MicroK8s 1.32
MongoDB 8.0
StatefulSet

Kubernetes21 Apr 2025On-Prem Platform: Databases, TLS and ZabbixDeploy MongoDB, MySQL, PostgreSQL and Redis with Helm in replicated form, issue internal TLS with cert-manager, and monitor the cluster and databases with Zabbix.

MicroK8s 1.32
Helm 3.17
Zabbix 7.0 LTS

Kubernetes7 Apr 2025On-Prem Platform: Design and Node SetupDesign a cloud-style platform on servers you own: a three-node MicroK8s cluster with load balancing, ingress, storage options, namespaces, quotas and network policies.

MicroK8s 1.32
Ubuntu 24.04 LTS
MetalLB

Kubernetes18 Mar 2025Redis Pod Recovery on MicroK8s: Corrupt AOF, Full Disk and PermissionsRecover a Redis pod that will not start on a MicroK8s cluster: read the failure, repair or restore the AOF and RDB files on the hostpath volume, and harden the deployment so it recovers by itself.

MicroK8s 1.32
Redis 7.2
StatefulSet

20243

Kubernetes18 Nov 2024MicroK8s 1.31: Three-Node HA, MetalLB, Ingress and Automatic TLSJoin three nodes into an HA cluster, give ingress a stable virtual IP with MetalLB, and issue Let's Encrypt certificates automatically with cert-manager.

MicroK8s 1.31
MetalLB
Ingress NGINX

Kubernetes4 Nov 2024MicroK8s 1.31 on Ubuntu 24.04: Install and Core Add-onsInstall a single-node MicroK8s 1.31 cluster, enable DNS, storage, ingress, metrics and RBAC, deploy a sample app, and learn upgrade and removal commands.

MicroK8s 1.31
Kubernetes 1.31
Ubuntu 24.04 LTS

Kubernetes15 Oct 2024Kafka Pod in CrashLoopBackOff: Finding the Cause and RecoveringA step-by-step method for a Kafka broker pod stuck in CrashLoopBackOff on Kubernetes: read the exit code and logs, then fix cluster ID mismatches, full disks, memory limits, bad listeners and corrupt logs.

Kafka 3.8 KRaft
Kubernetes 1.30
StatefulSet

20228

Kubernetes18 Apr 2022Getting Ready for Dockershim Removal in 1.24Kubernetes 1.24 removes dockershim. How to find nodes and workloads that depend on Docker Engine, migrate to containerd, and the cri-dockerd alternative.

Kubernetes 1.23
containerd 1.6
Kubernetes 1.24

Kubernetes4 Apr 2022Back Up etcd Before You UpgradeTake and verify an etcd snapshot, back up certificates, and run a kubeadm minor upgrade with drain, uncordon and a tested rollback plan on Kubernetes 1.23.

kubeadm 1.23
etcd 3.5
Kubernetes 1.23

Kubernetes21 Mar 2022Troubleshooting Pods: A Short ChecklistA decision-tree approach to Pending, ImagePullBackOff, CrashLoopBackOff, OOMKilled, probe failures and stuck Terminating pods, with the exact kubectl commands to use.

Kubernetes 1.23
kubectl 1.23
kubectl debug

Kubernetes7 Mar 2022A Managed Cluster on Amazon EKSCreate a production-shaped EKS cluster with eksctl: managed node groups, IAM roles for service accounts, add-ons, access control, logging, cost and upgrades.

Amazon EKS 1.21
eksctl 0.8x
Region ap-south-1

Kubernetes21 Feb 2022Monitoring a Cluster with kube-prometheus-stackInstall the kube-prometheus-stack Helm chart, understand ServiceMonitors and PrometheusRules, add your own app and alerts, size storage and retention, and manage CRD upgrades.

kube-prometheus-stack
Prometheus Operator
Grafana 8

Kubernetes7 Feb 2022GitOps with Argo CDDeploy to Kubernetes from Git with Argo CD 2.2: repository layout, Applications, automated sync with prune and self-heal, projects, RBAC, secrets and rollbacks.

Argo CD 2.2
Kubernetes 1.23
Git

Kubernetes24 Jan 2022Free TLS Certificates with cert-managerInstall cert-manager 1.6, configure Let's Encrypt issuers for HTTP-01 and DNS-01 challenges, issue certificates from Ingress annotations, and debug the request chain.

cert-manager 1.6
Let's Encrypt
Kubernetes 1.23

Kubernetes10 Jan 2022StatefulSets for Databases and QueuesWhat a StatefulSet guarantees, how to build a PostgreSQL primary and replicas safely, the storage, upgrade and failure behaviour to understand, and when to use an operator instead.

Kubernetes 1.23
StatefulSet
PostgreSQL 14

202116

Kubernetes20 Dec 2021Log4Shell and Your ContainersFind, fix and contain the Log4j vulnerability (CVE-2021-44228) across container images and Kubernetes workloads, with a timeline of fixes and what is still uncertain.

Log4j 2.17.0
CVE-2021-44228
Trivy

Kubernetes13 Dec 2021Kubernetes 1.23: What ChangedThe Kubernetes 1.23 release: stable HPA v2, dual-stack networking, Pod Security Admission in beta, CSI migration and the road to removing dockershim in 1.24.

Kubernetes 1.23
Pod Security Admission beta
HPA autoscaling/v2

Kubernetes15 Nov 2021Network Policies: Default DenyReplace the open Kubernetes pod network with explicit allow rules: default-deny policies, DNS exceptions, namespace and pod selectors, testing, and CNI requirements.

Kubernetes 1.22
NetworkPolicy
Calico 3.20

Kubernetes1 Nov 2021RBAC and Service AccountsControl who and what can do which actions in a Kubernetes cluster: Roles, bindings, service accounts, token behaviour in 1.22, and an audit routine.

Kubernetes 1.22
rbac.authorization.k8s.io/v1
ServiceAccount

Kubernetes18 Oct 2021Autoscaling Pods with the HPAInstall metrics-server, configure a HorizontalPodAutoscaler on CPU and memory, tune scaling behaviour, and combine it with node autoscaling and load testing.

Kubernetes 1.22
metrics-server 0.5
autoscaling/v1

Kubernetes4 Oct 2021Helm: Packaging and Installing ApplicationsUse Helm 3 to install, configure, upgrade and roll back applications, write a small chart of your own, and avoid the common release-management mistakes.

Helm 3
Kubernetes 1.22
Chart.yaml

Kubernetes20 Sept 2021IngressClass and ingress-nginx 1.0What changed in ingress-nginx 1.0: the Ingress v1 API, IngressClass resources, the deprecated annotation, and a safe upgrade path from 0.x.

ingress-nginx 1.0
Kubernetes 1.22
IngressClass

Kubernetes6 Sept 2021Persistent Volumes and ClaimsHow PersistentVolumes, PersistentVolumeClaims, StorageClasses and CSI drivers work, with dynamic provisioning on EKS-style clusters, expansion, snapshots and backup practice.

Kubernetes 1.22
CSI
StorageClass

Kubernetes23 Aug 2021Ingress: One Entry Point for Many ServicesRoute HTTP and HTTPS traffic to many Services through one load balancer using the networking.k8s.io/v1 Ingress API and ingress-nginx, with TLS and path rules.

Kubernetes 1.22
Ingress networking.k8s.io/v1
ingress-nginx 0.49

Kubernetes9 Aug 2021Kubernetes 1.22: Removed APIs to Fix Before UpgradingKubernetes 1.22 removes several long-deprecated v1beta1 APIs including Ingress and CustomResourceDefinition. How to find what you use, convert manifests and Helm charts, and plan the upgrade.

Kubernetes 1.22
kubectl-convert
pluto

Kubernetes19 Jul 2021Health Probes and Resource RequestsConfigure liveness, readiness and startup probes correctly, set requests and limits from measurements, and understand QoS classes, throttling and evictions.

Kubernetes 1.21
Startup probe GA
metrics-server

Kubernetes5 Jul 2021ConfigMaps and SecretsSeparate configuration from images with ConfigMaps and Secrets, choose between env vars and mounted files, use immutable objects, and understand what Secrets do and do not protect.

Kubernetes 1.21
Immutable ConfigMaps GA
Secrets

Kubernetes21 Jun 2021Services and Cluster DNSHow Services give pods a stable address, the four Service types, headless Services and cluster DNS naming, with a debugging routine for traffic that does not arrive.

Kubernetes 1.21
CoreDNS 1.8
kube-proxy

Kubernetes7 Jun 2021Pods and DeploymentsWrite a production-shaped Deployment: labels, rolling updates, resources, security context, scaling, rollouts and rollbacks, plus how pods really behave.

Kubernetes 1.21
apps/v1 Deployment
ReplicaSet

Kubernetes17 May 2021A Local Cluster in a Minute with kindRun a real multi-node Kubernetes cluster inside Docker for learning and CI, with port mappings for ingress, local image loading, and clean teardown.

kind 0.10
Kubernetes 1.20 node image
kubectl 1.21

Kubernetes3 May 2021Kubernetes Architecture in One PageThe control plane, nodes and objects of a Kubernetes 1.21 cluster, what happens when you run kubectl apply, and where each component fails.

Kubernetes 1.21
containerd
etcd 3.4