add mariadb image

tfgrid3/monitored_mariadb/Dockerfile

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+FROM ubuntu
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update && \
+    apt-get install -y \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    software-properties-common
+
+RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - &&\
+    add-apt-repository \
+    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+    $(lsb_release -cs) \
+    stable"
+
+RUN apt-get update && apt-get install -y docker-ce
+
+RUN apt install -y wget openssh-server
+
+COPY . .
+
+RUN wget -O /sbin/zinit https://github.com/threefoldtech/zinit/releases/download/v0.2.5/zinit && \
+    chmod +x /sbin/zinit
+
+
+ENTRYPOINT [ "/sbin/zinit", "init" ]

tfgrid3/monitored_mariadb/docker-compose.yml

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+services:
+  mariadb-master:
+    image: mariadb:latest
+    container_name: mariadb-master
+    environment:
+      MYSQL_ROOT_PASSWORD: rootpassword
+      MYSQL_DATABASE: mydb
+      MYSQL_USER: user
+      MYSQL_PASSWORD: password
+    volumes:
+      - master-data:/var/lib/mysql
+    networks:
+      - monitoring
+
+  mariadb-slave:
+    image: mariadb:latest
+    container_name: mariadb-slave
+    environment:
+      MYSQL_ROOT_PASSWORD: rootpassword
+      MYSQL_REPLICATION_MODE: slave
+      MYSQL_MASTER_HOST: mariadb-master
+      MYSQL_MASTER_USER: root
+      MYSQL_MASTER_PASSWORD: password
+      MYSQL_DATABASE: mydb
+    depends_on:
+      - mariadb-master
+    networks:
+      - monitoring
+
+  mariadb_exporter:
+    image: prom/mysqld-exporter:latest
+    container_name: mariadb_exporter
+    command:
+      - "--mysqld.username=user:password"
+      - "--mysqld.address=mariadb-master:3306"
+    ports:
+      - "9104:9104"
+    depends_on:
+      - mariadb-master
+
+  prometheus:
+    image: prom/prometheus
+    container_name: prometheus
+    command:
+      - "--config.file=/etc/prometheus/prometheus.yml"
+    ports:
+      - 9090:9090
+    restart: unless-stopped
+    volumes:
+      - ./prometheus:/etc/prometheus
+
+  grafana:
+    image: grafana/grafana
+    container_name: grafana
+    ports:
+      - 3000:3000
+    restart: unless-stopped
+    environment:
+      - GF_SECURITY_ADMIN_USER=admin
+      - GF_SECURITY_ADMIN_PASSWORD=grafana
+    volumes:
+      - ./provisioning:/etc/grafana/provisioning
+      - ./provisioning/dashboards:/var/lib/grafana/dashboards
+
+volumes:
+  master-data:
+
+networks:
+  monitoring:
+    driver: bridge

tfgrid3/monitored_mariadb/etc/zinit/dockerd.yaml

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+exec: dockerd -D
+test: docker ps

tfgrid3/monitored_mariadb/etc/zinit/maria-cluster.yaml

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+exec: docker compose -p monitored-mariadb up
+oneshot: true

tfgrid3/monitored_mariadb/etc/zinit/sshd.yaml

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+exec: /usr/sbin/sshd -D

tfgrid3/monitored_mariadb/etc/zinit/sshkey.yaml

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+exec: |
+  bash -c '
+    if [ ! -z "$SSH_KEY" ]; then
+      mkdir -p /var/run/sshd
+      mkdir -p /root/.ssh
+      touch /root/.ssh/authorized_keys
+
+      chmod 700 /root/.ssh
+      chmod 600 /root/.ssh/authorized_keys
+
+      echo "$SSH_KEY" >> /root/.ssh/authorized_keys
+    fi
+  '
+oneshot: true

tfgrid3/monitored_mariadb/prometheus/prometheus.yml

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+global:
+  scrape_interval: 15s
+
+scrape_configs:
+  - job_name: 'mariadb-exporter'
+    static_configs:
+      - targets: ['mariadb_exporter:9104']

tfgrid3/monitored_mariadb/provisioning/dashboards/default.yml

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+apiVersion: 1
+
+providers:
+  - name: Default # A uniquely identifiable name for the provider
+    folder: Services # The folder where to place the dashboards
+    type: file
+    options:
+      path: /var/lib/grafana/dashboards

tfgrid3/monitored_mariadb/provisioning/dashboards/simple-dashboard.json

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+{
+  "annotations": {
+    "list": []
+  },
+  "editable": true,
+  "gnetId": null,
+  "graphTooltip": 0,
+  "id": null,
+  "links": [],
+  "panels": [
+    {
+      "datasource": "Prometheus",
+      "fieldConfig": {
+        "defaults": {},
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 9,
+        "w": 12,
+        "x": 0,
+        "y": 0
+      },
+      "id": 1,
+      "targets": [
+        {
+          "expr": "up",
+          "interval": "",
+          "legendFormat": "{{instance}}",
+          "refId": "A"
+        }
+      ],
+      "title": "Service Status",
+      "type": "graph"
+    }
+  ],
+  "refresh": "5s",
+  "schemaVersion": 30,
+  "style": "dark",
+  "tags": [],
+  "templating": {
+    "list": []
+  },
+  "time": {
+    "from": "now-5m",
+    "to": "now"
+  },
+  "timepicker": {},
+  "timezone": "",
+  "title": "Simple Dashboard",
+  "uid": "simple-dashboard",
+  "version": 1
+}

tfgrid3/monitored_mariadb/provisioning/datasources/default.yml

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+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    url: http://prometheus:9090
+    isDefault: true
+    access: proxy
+    editable: true