Exemples del curs

exemples/mariadb-replication/mariadb-replication.yaml

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+# ConfigMap holding information about configuration files for primary/secondary and dockerinit
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: mariadb-configmap
+data:
+
+  primary.cnf: |
+    [mariadb]
+    log-bin                         # enable binary logging
+    log-basename=my-mariadb         # used to be independent of hostname changes (otherwise is in datadir/mysql)
+
+  replica.cnf: |
+    [mariadb]
+    log-basename=my-mariadb         # used to be independent of hostname changes (otherwise is in datadir/mysql)
+
+  primary.sql: |
+    CREATE USER 'repluser'@'%' IDENTIFIED BY 'replsecret';
+    GRANT REPLICATION REPLICA ON *.* TO 'repluser'@'%';
+    CREATE DATABASE primary_db;
+
+  secondary.sql: |
+    # We have to know name of sts (`mariadb-sts`) and 
+    # service `mariadb-service` in advance as an FQDN.
+    # No need to use master_port
+    CHANGE MASTER TO 
+    MASTER_HOST='mariadb-sts-0.mariadb-service.default.svc.cluster.local',
+    MASTER_USER='repluser',
+    MASTER_PASSWORD='replsecret',
+    MASTER_CONNECT_RETRY=10;
+
+# Secret holds information about root password
+---
+apiVersion: v1
+kind: Secret
+metadata:
+    name: mariadb-secret
+type: Opaque
+data:
+  mariadb-root-password: c2VjcmV0 # echo -n 'secret'|base64
+
+# Headless service
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: mariadb-service
+  labels:
+    app: mariadb
+spec:
+  ports:
+  - port: 3306
+    name: mariadb-port
+  clusterIP: None
+  selector:
+    app: mariadb
+
+# Statefulset
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: mariadb-sts
+spec:
+  serviceName: "mariadb-service"
+  replicas: 3
+  selector:
+    matchLabels:
+      app: mariadb
+  template:
+    metadata:
+      labels:
+        app: mariadb
+    spec:
+      initContainers:
+      - name: init-mariadb
+        image: mariadb
+        imagePullPolicy: Always
+        command:
+        - bash
+        - "-c"
+        - |
+          set -ex
+          echo 'Starting init-mariadb';
+          # Check config map to directory that already exists 
+          # (but must be used as a volume for main container)
+          ls /mnt/config-map
+          # Statefulset has sticky identity, number should be last
+          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
+          ordinal=${BASH_REMATCH[1]}
+          # Copy appropriate conf.d files from config-map to 
+          # mariadb-config volume (emptyDir) depending on pod number
+          if [[ $ordinal -eq 0 ]]; then
+            # This file holds SQL for connecting to primary
+            cp /mnt/config-map/primary.cnf /etc/mysql/conf.d/server-id.cnf
+            # Create the users needed for replication on primary on a volume
+            # initdb (emptyDir)
+            cp /mnt/config-map/primary.sql /docker-entrypoint-initdb.d
+          else
+            # This file holds SQL for connecting to secondary
+            cp /mnt/config-map/replica.cnf /etc/mysql/conf.d/server-id.cnf
+            # On replicas use secondary configuration on initdb volume
+            cp /mnt/config-map/secondary.sql /docker-entrypoint-initdb.d
+          fi
+          # Add an offset to avoid reserved server-id=0 value.
+          echo server-id=$((3000 + $ordinal)) >> etc/mysql/conf.d/server-id.cnf
+          ls /etc/mysql/conf.d/
+          cat /etc/mysql/conf.d/server-id.cnf
+        volumeMounts:
+          - name: mariadb-config-map
+            mountPath: /mnt/config-map
+          - name: mariadb-config
+            mountPath: /etc/mysql/conf.d/
+          - name: initdb
+            mountPath: /docker-entrypoint-initdb.d
+      restartPolicy: Always
+      containers:
+      - name: mariadb
+        image: mariadb
+        ports:
+        - containerPort: 3306
+          name: mariadb-port
+        env:
+        # Using Secrets
+        - name: MARIADB_ROOT_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: mariadb-secret
+              key: mariadb-root-password
+        - name: MYSQL_INITDB_SKIP_TZINFO
+          value: "1"
+        # Mount volume from persistent volume claim
+        volumeMounts:
+        - name: datadir
+          mountPath: /var/lib/mysql/
+        - name: mariadb-config
+          mountPath: /etc/mysql/conf.d/
+        - name: initdb
+          mountPath: /docker-entrypoint-initdb.d
+      volumes:
+      - name: mariadb-config-map
+        configMap:
+          name: mariadb-configmap
+          #defaultMode: 0544
+      - name: mariadb-config
+        emptyDir: {}
+      - name: initdb
+        emptyDir: {}
+
+  volumeClaimTemplates:
+  - metadata:
+      name: datadir
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      resources:
+        requests:
+          storage: 300M