Month: November 2021

opensearch docker-compose

version: '3'
services:
  opensearch-node1:
    image: opensearchproject/opensearch:latest
    container_name: opensearch-node1
    environment:
      - discovery.type=single-node
    ulimits:
      memlock:
        soft: -1
        hard: -1
      nofile:
        soft: 65536
        hard: 65536
    volumes:
      - /opt/opensearch:/usr/share/opensearch/data
    ports:
      - 9200:9200
      - 9600:9600
  opensearch-dashboards:
    image: opensearchproject/opensearch-dashboards:latest
    container_name: opensearch-dashboards
    ports:
      - 5601:5601
    expose:
      - "5601"
    environment:
      OPENSEARCH_HOSTS: '["https://opensearch-node1:9200"]'

more : https://opensearch.org/samples/docker-compose.yml

Simple Kubernetes NFS Subdir – External Provisioner

Why?
– No need to create directory manually on nfs server
– Easy

helm repo add nfs-subdir-external-provisioner https://kubernetes-sigs.github.io/nfs-subdir-external-provisioner/

helm upgrade --install nfs-subdir-external-provisioner nfs-subdir-external-provisioner/nfs-subdir-external-provisioner --set nfs.server=192.168.0.182 --set nfs.path=/mnt/nfs2 --set storageClass.defaultClass=true --set storageClass.onDelete=retain

deployment-nginx.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
spec:
  selector:
    matchLabels:
      run: my-nginx
  replicas: 1
  template:
    metadata:
      labels:
        run: my-nginx
    spec:
      containers:
      - name: my-nginx
        image: nginx
        ports:
        - containerPort: 80
        volumeMounts:
        - name: pvc-claim
          mountPath: /data
        resources:
          requests:
            memory: "256Mi"
            cpu: "100m"
          limits:
            memory: "256Mi"
            cpu: "100m"
      volumes:
        - name: pvc-claim
          persistentVolumeClaim:
            claimName: test-claim
---

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-claim
  annotations:
    nfs.io/storage-path: "test-path"
spec:
  storageClassName: nfs-client
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 10Mi

More : https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner

simple redis deployment in kubernetes

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-deployment
  labels:
    app: redis
    env: prod
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis
      env: prod
  template:
    metadata:
      labels:
        app: redis
        env: prod
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: "kubernetes.io/arch"
                operator: "In"
                values:
                - arm64
      tolerations:
      - key: "key"
        operator: "Equal"
        value: "arm"
        effect: "NoSchedule" 
      containers:
      - name: redis-container
        image: redis:6.2
        imagePullPolicy: IfNotPresent
        resources:
          requests:
            memory: "128Mi"
            cpu: "100m"
          limits:
            memory: "512Mi"
            cpu: "300m"
        volumeMounts:
          - name: redis-data
            mountPath: /data
        ports:
        - containerPort: 9090
      volumes:
        - name: redis-data
          nfs:
            server: 192.168.0.182
            path: "/mnt/nfs1/redis"
---
kind: Service
apiVersion: v1
metadata:
  name: redis-service
  labels:
    app: redis
    env: prod
spec:
  selector:
    app: redis
    env: prod
  ports:
  - name: redis
    protocol: TCP
    port: 6379
    targetPort: 6379
    nodePort: 31000
  type: NodePort

redis cli:

127.0.0.1:6379> set var1 100
OK
127.0.0.1:6379> get var1
"100"
127.0.0.1:6379> incr var1
(integer) 101
127.0.0.1:6379> get var1
"101"

prometheus service discovery – aws ec2 instance with tag

  • Create role(prometheus-ec2) with AmazonEC2ReadOnlyAccess policy
  • Attach role to ec2
  • Tag ec2

prometheus.yml

kind: ConfigMap
apiVersion: v1
metadata:
  name: prometheus-conf
data:
  prometheus.yml: |

global:
  scrape_interval:     10s
  evaluation_interval: 10s
scrape_configs:          
  - job_name: 'ec2-node'
    ec2_sd_configs:
      - region: ap-south-1
        port: 9100
    relabel_configs:
      - source_labels: [__meta_ec2_tag_app]
        action: keep
        regex: 'pro.*'
      - source_labels: [__meta_ec2_private_ip]
        action: replace
        target_label: ec2_private_ip