prvng_extensions/taskservs/storage/rook_ceph/README.md

# Rook-Ceph Task Service

## Overview

The Rook-Ceph task service provides a complete installation and configuration of [Rook](https://rook.io/) with [Ceph](https://ceph.io/), a cloud-native storage orchestrator that automates deployment, bootstrapping, configuration, provisioning, scaling, upgrading, migration, disaster recovery, monitoring, and resource management of Ceph storage in Kubernetes environments.

## Features

### Core Storage Features
- **Block Storage (RBD)** - High-performance block storage for databases and applications
- **Object Storage (RGW)** - S3-compatible object storage for applications and backups
- **File System (CephFS)** - POSIX-compliant shared file system for multiple consumers
- **Multi-Site Replication** - Geographic data replication and disaster recovery
- **Erasure Coding** - Space-efficient data protection with configurable redundancy

### Kubernetes Native Features
- **Operator-Based Management** - Kubernetes-native lifecycle management
- **Dynamic Provisioning** - Automatic PV provisioning with StorageClasses
- **CSI Driver Integration** - Container Storage Interface for advanced features
- **Snapshots & Cloning** - Volume snapshots and cloning capabilities
- **Resizing** - Online volume expansion and shrinking

### High Availability & Scalability
- **Distributed Architecture** - No single point of failure
- **Automatic Recovery** - Self-healing and data rebalancing
- **Horizontal Scaling** - Add/remove storage nodes dynamically
- **Multi-Zone Deployment** - Cross-zone and cross-region deployment
- **Load Balancing** - Automatic load distribution across OSDs

### Management & Monitoring
- **Ceph Dashboard** - Web-based management interface
- **Prometheus Integration** - Comprehensive metrics and monitoring
- **Health Monitoring** - Continuous cluster health monitoring
- **Performance Monitoring** - Real-time performance metrics
- **Alerting System** - Configurable alerts for various conditions

### Security Features
- **Encryption at Rest** - Transparent data encryption
- **Encryption in Transit** - Network traffic encryption
- **Authentication** - CephX authentication system
- **Access Control** - Fine-grained access control policies
- **Security Hardening** - Security best practices implementation

## Configuration

### Basic Ceph Cluster
```kcl
rook_ceph: RookCeph = {
    name: "rook-ceph"
    namespace: "rook-ceph"
    clustername: "rook-ceph"
    ceph_image: "quay.io/ceph/ceph:v18.2.4"
    rookCeph_image: "rook/ceph:v1.14.2"
    dataDirHostPath: "/var/lib/rook"
    object_user: "ceph-user"
    object_storename: "ceph-objectstore"
    object_displayname: "Ceph Object Store"
    storage_fsName: "cephfs"
    storage_pool: "cephfs-replicated"
    nodes: [
        {
            name: "node1"
            devices: ["/dev/sdb", "/dev/sdc"]
        },
        {
            name: "node2"
            devices: ["/dev/sdb", "/dev/sdc"]
        },
        {
            name: "node3"
            devices: ["/dev/sdb", "/dev/sdc"]
        }
    ]
}
```

### Production Ceph Cluster
```kcl
rook_ceph: RookCeph = {
    name: "rook-ceph-prod"
    namespace: "rook-ceph"
    clustername: "production-ceph"
    ceph_image: "quay.io/ceph/ceph:v18.2.4"
    rookCeph_image: "rook/ceph:v1.14.2"
    dataDirHostPath: "/var/lib/rook"
    object_user: "prod-user"
    object_storename: "production-objectstore"
    object_displayname: "Production Object Store"
    storage_fsName: "production-fs"
    storage_pool: "replicated-pool"
    nodes: [
        {
            name: "storage-01"
            devices: ["/dev/nvme0n1", "/dev/nvme1n1", "/dev/nvme2n1"]
        },
        {
            name: "storage-02"
            devices: ["/dev/nvme0n1", "/dev/nvme1n1", "/dev/nvme2n1"]
        },
        {
            name: "storage-03"
            devices: ["/dev/nvme0n1", "/dev/nvme1n1", "/dev/nvme2n1"]
        },
        {
            name: "storage-04"
            devices: ["/dev/nvme0n1", "/dev/nvme1n1", "/dev/nvme2n1"]
        },
        {
            name: "storage-05"
            devices: ["/dev/nvme0n1", "/dev/nvme1n1", "/dev/nvme2n1"]
        }
    ]
    cluster_config: {
        mon_count: 5
        mon_allow_multiple_per_node: false
        mgr_count: 2
        dashboard_enabled: true
        dashboard_ssl: true
        monitoring_enabled: true
        crash_collector_disable: false
        log_collector_disable: false
        cleanup_confirm_i_really_mean_it: false
    }
    storage_config: {
        use_all_nodes: false
        use_all_devices: false
        store_type: "bluestore"
        database_size_mb: 1024
        journal_size_mb: 1024
        osds_per_device: 1
        encrypt_device: true
    }
}
```

### Multi-Zone High Availability Setup
```kcl
rook_ceph: RookCeph = {
    name: "rook-ceph-ha"
    namespace: "rook-ceph-system"
    clustername: "ha-ceph-cluster"
    ceph_image: "quay.io/ceph/ceph:v18.2.4"
    rookCeph_image: "rook/ceph:v1.14.2"
    dataDirHostPath: "/var/lib/rook"
    # ... base configuration
    placement: {
        mon: {
            node_affinity: {
                required_during_scheduling_ignored_during_execution: {
                    node_selector_terms: [
                        {
                            match_expressions: [
                                {
                                    key: "rook.io/has-disk"
                                    operator: "In"
                                    values: ["true"]
                                }
                            ]
                        }
                    ]
                }
            }
            pod_anti_affinity: {
                preferred_during_scheduling_ignored_during_execution: [
                    {
                        weight: 100
                        pod_affinity_term: {
                            label_selector: {
                                match_expressions: [
                                    {
                                        key: "app"
                                        operator: "In"
                                        values: ["rook-ceph-mon"]
                                    }
                                ]
                            }
                            topology_key: "kubernetes.io/hostname"
                        }
                    }
                ]
            }
            tolerations: [
                {
                    key: "storage-node"
                    operator: "Exists"
                }
            ]
        }
        mgr: {
            # Similar placement rules for managers
        }
        osd: {
            # Similar placement rules for OSDs
        }
    }
    disaster_recovery: {
        enabled: true
        backup_schedule: "0 2 * * *"  # Daily at 2 AM
        retention_days: 30
        remote_site: {
            enabled: true
            endpoint: "https://backup-site.company.com"
            access_key: "backup-access-key"
            secret_key: "backup-secret-key"
            bucket: "ceph-dr-backups"
        }
    }
}
```

### Object Storage Configuration
```kcl
rook_ceph: RookCeph = {
    name: "rook-ceph-object"
    # ... base configuration
    object_stores: [
        {
            name: "production-s3"
            namespace: "rook-ceph"
            spec: {
                metadata_pool: {
                    replicated: {
                        size: 3
                        require_safe_replica_size: true
                    }
                }
                data_pool: {
                    erasure_coded: {
                        data_chunks: 4
                        coding_chunks: 2
                    }
                }
                preserve_pools_on_delete: false
                gateway: {
                    port: 80
                    secure_port: 443
                    instances: 3
                    placement: {
                        node_affinity: {
                            required_during_scheduling_ignored_during_execution: {
                                node_selector_terms: [
                                    {
                                        match_expressions: [
                                            {
                                                key: "node-type"
                                                operator: "In"
                                                values: ["storage"]
                                            }
                                        ]
                                    }
                                ]
                            }
                        }
                    }
                    resources: {
                        limits: {
                            cpu: "2000m"
                            memory: "4Gi"
                        }
                        requests: {
                            cpu: "1000m"
                            memory: "2Gi"
                        }
                    }
                }
                health_check: {
                    bucket: {
                        enabled: true
                        interval: "60s"
                    }
                }
            }
        }
    ]
    object_store_users: [
        {
            name: "app-user"
            namespace: "rook-ceph"
            display_name: "Application User"
            capabilities: {
                user: "read, write"
                bucket: "read, write, delete"
                metadata: "read, write"
                usage: "read"
                zone: "read"
            }
            quota: {
                max_objects: 10000
                max_size: "100Gi"
            }
        }
    ]
}
```

### File System Configuration
```kcl
rook_ceph: RookCeph = {
    name: "rook-ceph-fs"
    # ... base configuration
    filesystems: [
        {
            name: "shared-fs"
            namespace: "rook-ceph"
            spec: {
                metadata_pool: {
                    replicated: {
                        size: 3
                        require_safe_replica_size: true
                    }
                }
                data_pools: [
                    {
                        name: "replicated-pool"
                        replicated: {
                            size: 3
                            require_safe_replica_size: true
                        }
                    },
                    {
                        name: "erasure-coded-pool"
                        erasure_coded: {
                            data_chunks: 6
                            coding_chunks: 2
                        }
                    }
                ]
                preserve_filesystem_on_delete: false
                metadata_server: {
                    active_count: 2
                    active_standby: true
                    placement: {
                        node_affinity: {
                            required_during_scheduling_ignored_during_execution: {
                                node_selector_terms: [
                                    {
                                        match_expressions: [
                                            {
                                                key: "node-type"
                                                operator: "In"
                                                values: ["storage"]
                                            }
                                        ]
                                    }
                                ]
                            }
                        }
                    }
                    resources: {
                        limits: {
                            cpu: "3000m"
                            memory: "8Gi"
                        }
                        requests: {
                            cpu: "1000m"
                            memory: "4Gi"
                        }
                    }
                    priority_class_name: "system-cluster-critical"
                }
            }
        }
    ]
}
```

### Monitoring and Alerting Configuration
```kcl
rook_ceph: RookCeph = {
    name: "rook-ceph-monitoring"
    # ... base configuration
    monitoring: {
        enabled: true
        prometheus: {
            enabled: true
            service_monitor: true
            external_mgr_endpoints: []
            external_mgr_prometheus_port: 9283
        }
        grafana: {
            enabled: true
            service_type: "ClusterIP"
            ingress: {
                enabled: true
                host: "grafana.ceph.company.com"
                annotations: {
                    "kubernetes.io/ingress.class": "nginx"
                    "cert-manager.io/cluster-issuer": "letsencrypt-prod"
                }
                tls: [
                    {
                        hosts: ["grafana.ceph.company.com"]
                        secret_name: "grafana-tls"
                    }
                ]
            }
        }
        alertmanager: {
            enabled: true
            config: {
                global: {
                    smtp_smarthost: "smtp.company.com:587"
                    smtp_from: "alerts@company.com"
                }
                route: {
                    group_by: ["alertname"]
                    group_wait: "10s"
                    group_interval: "10s"
                    repeat_interval: "1h"
                    receiver: "web.hook"
                }
                receivers: [
                    {
                        name: "web.hook"
                        email_configs: [
                            {
                                to: "storage-team@company.com"
                                subject: "Ceph Alert: {{ .GroupLabels.alertname }}"
                                body: "{{ range .Alerts }}{{ .Annotations.summary }}{{ end }}"
                            }
                        ]
                    }
                ]
            }
        }
    }
}
```

## Usage

### Deploy Rook-Ceph
```bash
./core/nulib/provisioning taskserv create rook-ceph --infra <infrastructure-name>
```

### List Available Task Services
```bash
./core/nulib/provisioning taskserv list
```

### SSH to Storage Node
```bash
./core/nulib/provisioning server ssh <storage-node>
```

### Cluster Management
```bash
# Check cluster status
kubectl -n rook-ceph get cephcluster

# View cluster details
kubectl -n rook-ceph describe cephcluster rook-ceph

# Check operator status
kubectl -n rook-ceph get pods -l app=rook-ceph-operator

# View operator logs
kubectl -n rook-ceph logs -l app=rook-ceph-operator -f
```

### Storage Operations
```bash
# Check OSD status
kubectl -n rook-ceph get pods -l app=rook-ceph-osd

# View storage classes
kubectl get storageclass

# Create test PVC
kubectl apply -f - <<EOF
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: test-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  storageClassName: rook-ceph-block
EOF

# Check PVC status
kubectl get pvc test-pvc
```

### Ceph Dashboard Access
```bash
# Get dashboard service
kubectl -n rook-ceph get service rook-ceph-mgr-dashboard

# Port forward to dashboard
kubectl -n rook-ceph port-forward service/rook-ceph-mgr-dashboard 8443:8443

# Get admin password
kubectl -n rook-ceph get secret rook-ceph-dashboard-password -o jsonpath="{['data']['password']}" | base64 --decode

# Access dashboard at https://localhost:8443
```

### Ceph Commands via Toolbox
```bash
# Deploy Ceph toolbox
kubectl apply -f https://raw.githubusercontent.com/rook/rook/master/deploy/examples/toolbox.yaml

# Access Ceph toolbox
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- bash

# Inside toolbox - check cluster status
ceph status
ceph health detail
ceph df

# Check OSD status
ceph osd status
ceph osd tree
ceph osd pool ls

# Check mon status
ceph mon status
ceph quorum_status

# Check placement groups
ceph pg stat
ceph pg dump
```

### Object Storage Operations
```bash
# Create object store user
kubectl apply -f - <<EOF
apiVersion: ceph.rook.io/v1
kind: CephObjectStoreUser
metadata:
  name: test-user
  namespace: rook-ceph
spec:
  store: my-store
  displayName: "Test User"
EOF

# Get user credentials
kubectl -n rook-ceph get secret rook-ceph-object-user-test-user -o yaml

# Test S3 access
export AWS_HOST=$(kubectl -n rook-ceph get svc rook-ceph-rgw-my-store -o jsonpath='{.spec.clusterIP}')
export AWS_ENDPOINT=http://$AWS_HOST:80
export AWS_ACCESS_KEY_ID=$(kubectl -n rook-ceph get secret rook-ceph-object-user-test-user -o jsonpath='{.data.AccessKey}' | base64 --decode)
export AWS_SECRET_ACCESS_KEY=$(kubectl -n rook-ceph get secret rook-ceph-object-user-test-user -o jsonpath='{.data.SecretKey}' | base64 --decode)

# Create bucket and upload file
aws --endpoint-url $AWS_ENDPOINT s3 mb s3://test-bucket
aws --endpoint-url $AWS_ENDPOINT s3 cp /etc/hosts s3://test-bucket/
```

### File System Operations
```bash
# Create CephFS storage class
kubectl apply -f - <<EOF
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: rook-cephfs
provisioner: rook-ceph.cephfs.csi.ceph.com
parameters:
  clusterID: rook-ceph
  fsName: myfs
  pool: myfs-replicated
  csi.storage.k8s.io/provisioner-secret-name: rook-csi-cephfs-provisioner
  csi.storage.k8s.io/provisioner-secret-namespace: rook-ceph
  csi.storage.k8s.io/controller-expand-secret-name: rook-csi-cephfs-provisioner
  csi.storage.k8s.io/controller-expand-secret-namespace: rook-ceph
  csi.storage.k8s.io/node-stage-secret-name: rook-csi-cephfs-node
  csi.storage.k8s.io/node-stage-secret-namespace: rook-ceph
reclaimPolicy: Delete
allowVolumeExpansion: true
EOF

# Create shared PVC
kubectl apply -f - <<EOF
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: cephfs-pvc
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 100Gi
  storageClassName: rook-cephfs
EOF
```

### Monitoring and Metrics
```bash
# Check monitoring pods
kubectl -n rook-ceph get pods -l app=rook-ceph-exporter

# Access Prometheus metrics
kubectl -n rook-ceph port-forward service/rook-prometheus 9090:9090

# Check Grafana dashboards
kubectl -n rook-ceph port-forward service/rook-grafana 3000:3000

# View cluster metrics
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph tell mgr dump_historic_ops
```

## Architecture

### System Architecture
```
┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   Applications  │────│   Kubernetes     │────│   Ceph Cluster  │
│                 │    │   Storage        │    │                 │
│ • Databases     │    │                  │    │ • MON Nodes     │
│ • File Shares   │────│ • CSI Drivers    │────│ • MGR Nodes     │
│ • Object Store  │    │ • Storage Classes│    │ • OSD Nodes     │
│ • Backups       │    │ • PV/PVC         │    │ • MDS Nodes     │
└─────────────────┘    └──────────────────┘    └─────────────────┘
```

### Ceph Cluster Architecture
```
┌─────────────────────────────────────────────────────────────┐
│                      Ceph Cluster                          │
├─────────────────────────────────────────────────────────────┤
│  MON Nodes         │  MGR Nodes        │  OSD Nodes        │
│  (Monitors)        │  (Managers)       │  (Storage)        │
│                    │                   │                   │
│ • Cluster Map      │ • Dashboard       │ • Data Storage    │
│ • Consensus        │ • Metrics         │ • Replication     │
│ • Authentication   │ • Load Balancing  │ • Recovery        │
│ • Authorization    │ • Plugin System   │ • Scrubbing       │
├─────────────────────────────────────────────────────────────┤
│                    Storage Services                        │
├─────────────────────────────────────────────────────────────┤
│  RBD (Blocks)      │  CephFS (Files)   │  RGW (Objects)    │
│                    │                   │                   │
│ • Block Devices    │ • MDS Nodes       │ • S3/Swift API    │
│ • Snapshots        │ • POSIX FS        │ • Multi-Site      │
│ • Cloning          │ • Multi-Mount     │ • Bucket Policy   │
│ • Thin Provisioning│ • Quotas          │ • Load Balancer   │
└─────────────────────────────────────────────────────────────┘
```

### Rook Operator Architecture
```
┌─────────────────────────────────────────────────────────────┐
│                    Kubernetes Cluster                      │
├─────────────────────────────────────────────────────────────┤
│  Rook Operator     │  CSI Drivers      │  Storage Classes  │
│                    │                   │                   │
│ • CRD Management   │ • RBD CSI         │ • Block Storage   │
│ • Lifecycle Mgmt   │ • CephFS CSI      │ • File Storage    │
│ • Health Monitor   │ • Volume Mgmt     │ • Dynamic Prov    │
│ • Upgrades         │ • Snapshots       │ • Resizing        │
├─────────────────────────────────────────────────────────────┤
│                      Ceph Cluster                         │
├─────────────────────────────────────────────────────────────┤
│  Physical Storage  │  Network          │  Security         │
│                    │                   │                   │
│ • Raw Devices      │ • Cluster Network │ • Encryption      │
│ • Host Paths       │ • Public Network  │ • Authentication  │
│ • Node Selection   │ • Load Balancing  │ • Authorization   │
└─────────────────────────────────────────────────────────────┘
```

### File Structure
```
/var/lib/rook/                 # Rook data directory
├── rook-ceph/                # Cluster-specific data
│   ├── crash/               # Crash dumps
│   ├── log/                 # Ceph logs
│   ├── mon-a/              # Monitor data
│   ├── mgr-a/              # Manager data
│   ├── osd-0/              # OSD data
│   └── config/             # Ceph configuration

/etc/ceph/                    # Ceph configuration
├── ceph.conf               # Main configuration
├── keyring                 # Authentication keys
└── rbdmap                  # RBD device mapping

Kubernetes Resources:
├── CephCluster            # Main cluster definition
├── CephBlockPool          # Block storage pools
├── CephObjectStore        # Object storage definition
├── CephFilesystem         # File system definition
├── StorageClass           # Kubernetes storage classes
└── VolumeSnapshotClass    # Snapshot classes
```

## Supported Operating Systems

- Ubuntu 20.04+ / Debian 11+
- CentOS 8+ / RHEL 8+ / Fedora 35+
- Amazon Linux 2+
- SUSE Linux Enterprise 15+

## System Requirements

### Minimum Requirements (Development)
- **Kubernetes**: v1.22+ with 3 nodes
- **RAM**: 8GB per node (16GB+ recommended)
- **Storage**: 100GB raw storage per OSD
- **CPU**: 4 cores per node (8+ cores recommended)
- **Network**: 1Gbps between nodes

### Production Requirements
- **Kubernetes**: v1.22+ with 5+ nodes
- **RAM**: 32GB+ per storage node
- **Storage**: 1TB+ NVMe SSD per OSD (multiple OSDs per node)
- **CPU**: 16+ cores per storage node
- **Network**: 10Gbps+ dedicated storage network

### Hardware Recommendations
- **CPU**: High-frequency processors for better performance
- **Memory**: 4GB RAM per TB of raw storage (minimum)
- **Storage**: NVMe SSDs for best performance, separate devices for OSDs
- **Network**: Dedicated networks for cluster and public traffic

## Troubleshooting

### Cluster Health Issues
```bash
# Check cluster status
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph status

# Check health details
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph health detail

# Check cluster logs
kubectl -n rook-ceph logs -l app=rook-ceph-operator

# Check monitor status
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph mon status
```

### OSD Issues
```bash
# Check OSD status
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph osd status

# Check OSD tree
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph osd tree

# Check failed OSDs
kubectl -n rook-ceph get pods -l app=rook-ceph-osd

# Check OSD logs
kubectl -n rook-ceph logs rook-ceph-osd-0-xxx
```

### Storage Issues
```bash
# Check pool status
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph osd pool ls detail

# Check PG status
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph pg stat

# Check storage utilization
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph df

# Check slow operations
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph osd perf
```

### CSI Driver Issues
```bash
# Check CSI pods
kubectl -n rook-ceph get pods -l app=csi-rbdplugin
kubectl -n rook-ceph get pods -l app=csi-cephfsplugin

# Check CSI logs
kubectl -n rook-ceph logs -l app=csi-rbdplugin-provisioner
kubectl -n rook-ceph logs -l app=csi-cephfsplugin-provisioner

# Check volume attachments
kubectl get volumeattachments

# Debug PVC issues
kubectl describe pvc <pvc-name>
```

### Network Issues
```bash
# Check network connectivity
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph mon stat

# Test inter-node connectivity
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ping <node-ip>

# Check service endpoints
kubectl -n rook-ceph get endpoints

# Monitor network performance
kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- rados bench -p rbd 10 write
```

## Security Considerations

### Cluster Security
- **Network Isolation** - Separate storage network from application traffic
- **Encryption** - Enable encryption at rest and in transit
- **Authentication** - Use CephX authentication for all components
- **Access Control** - Implement proper RBAC for Kubernetes resources

### Data Security
- **Encryption at Rest** - Enable OSD encryption for sensitive data
- **Backup Security** - Encrypt backups and use secure storage
- **Network Security** - Use dedicated networks and VLANs
- **Key Management** - Secure key storage and rotation

### Kubernetes Security
- **RBAC** - Implement proper RBAC for Rook resources
- **Network Policies** - Use Kubernetes network policies
- **Pod Security** - Configure pod security policies
- **Secret Management** - Secure handling of Ceph secrets

### Operational Security
- **Regular Updates** - Keep Rook, Ceph, and Kubernetes updated
- **Security Monitoring** - Monitor for security events
- **Access Auditing** - Audit administrative access
- **Compliance** - Follow security compliance requirements

## Performance Optimization

### Hardware Optimization
- **NVMe Storage** - Use NVMe SSDs for OSDs and journals
- **Network Bandwidth** - Use 10Gbps+ networks for storage traffic
- **CPU Performance** - High-frequency CPUs for better IOPS
- **Memory** - Adequate RAM for buffer caches

### Ceph Configuration
- **OSD Configuration** - Optimize OSD threads and memory
- **Pool Configuration** - Choose appropriate replication/erasure coding
- **PG Configuration** - Optimize placement group counts
- **Network Configuration** - Separate cluster and public networks

### Kubernetes Optimization
- **Node Selection** - Use dedicated storage nodes
- **Resource Limits** - Set appropriate CPU and memory limits
- **Scheduling** - Use anti-affinity for high availability
- **Storage Classes** - Optimize storage class parameters

### Application Optimization
- **Access Patterns** - Understand application I/O patterns
- **Volume Sizing** - Right-size volumes for applications
- **Snapshot Management** - Efficient snapshot scheduling
- **Monitoring** - Continuous performance monitoring

## Resources

- **Official Documentation**: [rook.io/docs](https://rook.io/docs/)
- **Ceph Documentation**: [docs.ceph.com](https://docs.ceph.com/)
- **GitHub Repository**: [rook/rook](https://github.com/rook/rook)
- **Community Support**: [rook.io/community](https://rook.io/community/)
- **CNCF Project**: [cncf.io/projects/rook](https://www.cncf.io/projects/rook/)