feat: Add ELK stack deployment with Elasticsearch cluster, Kibana UI, and Logstash pipeline for telecom platform logging

- Add elasticsearch namespace with logging component labels and telecom-platform integration
- Add Elasticsearch StatefulSet with 3 master node replicas, cluster name telecom-platform-logs
- Add initContainers for vm.max_map_count and file descriptor limit configuration with privileged security context
- Add Elasticsearch 8.10.0 container with 9200 REST and 9300 inter-node ports, 1Gi-2

deployments/elk-stack/elasticsearch.yaml

@@ -0,0 +1,141 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: elasticsearch
+  labels:
+    app.kubernetes.io/name: elasticsearch
+    app.kubernetes.io/component: logging
+    app.kubernetes.io/part-of: telecom-platform
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: elasticsearch-master
+  namespace: elasticsearch
+  labels:
+    app.kubernetes.io/name: elasticsearch
+    app.kubernetes.io/component: master
+    app.kubernetes.io/part-of: telecom-platform
+spec:
+  serviceName: elasticsearch-master
+  replicas: 3
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: elasticsearch
+      app.kubernetes.io/component: master
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: elasticsearch
+        app.kubernetes.io/component: master
+        app.kubernetes.io/part-of: telecom-platform
+    spec:
+      securityContext:
+        fsGroup: 1000
+        runAsUser: 1000
+      initContainers:
+      - name: increase-vm-max-map
+        image: busybox:1.35.0
+        command: ["sysctl", "-w", "vm.max_map_count=262144"]
+        securityContext:
+          privileged: true
+      - name: increase-fd-limit
+        image: busybox:1.35.0
+        command: ["sh", "-c", "ulimit -n 65536"]
+        securityContext:
+          privileged: true
+      containers:
+      - name: elasticsearch
+        image: docker.elastic.co/elasticsearch/elasticsearch:8.10.0
+        ports:
+        - containerPort: 9200
+          name: rest
+        - containerPort: 9300
+          name: inter-node
+        env:
+        - name: cluster.name
+          value: telecom-platform-logs
+        - name: node.name
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.name
+        - name: discovery.seed_hosts
+          value: "elasticsearch-master"
+        - name: cluster.initial_master_nodes
+          value: "elasticsearch-master-0,elasticsearch-master-1,elasticsearch-master-2"
+        - name: ES_JAVA_OPTS
+          value: "-Xms1g -Xmx1g"
+        - name: xpack.security.enabled
+          value: "false"
+        - name: xpack.monitoring.collection.enabled
+          value: "true"
+        resources:
+          requests:
+            cpu: 500m
+            memory: 1Gi
+          limits:
+            cpu: 1000m
+            memory: 2Gi
+        volumeMounts:
+        - name: data
+          mountPath: /usr/share/elasticsearch/data
+        - name: config
+          mountPath: /usr/share/elasticsearch/config
+      volumes:
+      - name: config
+        configMap:
+          name: elasticsearch-config
+  volumeClaimTemplates:
+  - metadata:
+      name: data
+      labels:
+        app.kubernetes.io/name: elasticsearch
+        app.kubernetes.io/component: master
+        app.kubernetes.io/part-of: telecom-platform
+    spec:
+      accessModes: ["ReadWriteOnce"]
+      storageClassName: "standard"
+      resources:
+        requests:
+          storage: 20Gi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: elasticsearch-master
+  namespace: elasticsearch
+  labels:
+    app.kubernetes.io/name: elasticsearch
+    app.kubernetes.io/component: master
+    app.kubernetes.io/part-of: telecom-platform
+spec:
+  ports:
+  - port: 9200
+    name: rest
+  - port: 9300
+    name: inter-node
+  selector:
+    app.kubernetes.io/name: elasticsearch
+    app.kubernetes.io/component: master
+  clusterIP: None
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: elasticsearch-config
+  namespace: elasticsearch
+  labels:
+    app.kubernetes.io/name: elasticsearch
+    app.kubernetes.io/component: master
+    app.kubernetes.io/part-of: telecom-platform
+data:
+  elasticsearch.yml: |
+    cluster.name: telecom-platform-logs
+    node.name: ${HOSTNAME}
+    network.host: 0.0.0.0
+    discovery.seed_hosts: ["elasticsearch-master"]
+    cluster.initial_master_nodes: ["elasticsearch-master-0", "elasticsearch-master-1", "elasticsearch-master-2"]
+    xpack.security.enabled: false
+    xpack.monitoring.collection.enabled: true
+    xpack.monitoring.elasticsearch.collection.enabled: true
+    indices.lifecycle.poll_interval: 1m