# 08 - Test DB Docker Kurulumu (Swarm)

Bu asamanin amaci `iklim-db-01` node'unu Swarm'a worker olarak eklemek ve PostgreSQL ile MongoDB'yi Swarm servisi olarak calistirmaktir. Veri kaliciligini StorageBox saglar.

DB yazilimi Ansible tarafindan kurulmaz; bu belge DB node uzerinde elle veya ayri bir Ansible role ile uygulanir. `03-test-ansible-bootstrap.md` tamamlandiktan sonra baslayiniz.

## Mimari

```
iklim-app-01  (Swarm manager, 10.10.10.11)
    |
    |-- iklimco-net (overlay)
    |
iklim-db-01   (Swarm worker, 10.10.20.11) [role=db]
    |-- postgresql-v17  (Swarm service, placement: role=db)
    |-- mongo-v8        (Swarm service, placement: role=db)
    |
    /mnt/storagebox/test/db/
        postgresql/data/
        mongodb/data/
        mongodb/log/
        mongodb/config/
```

## On Kosullar

- `03-test-ansible-bootstrap.md` her iki node'da tamamlanmis olmali.
- StorageBox `/mnt/storagebox` olarak her iki node'da mount edilmis olmali.
- Docker `iklim-db-01` uzerinde kurulu olmali (bootstrap role bunu yapar).

## 1. Firewall Guncellemesi

`iklim-db-01`'in Swarm'a katilabilmesi icin ek kurallara ihtiyac var.
`terraform/hetzner/test/firewall.tf` dosyasina asagidaki kurallari ekle:

`hcloud_firewall.swarm` icine (DB subnet'ten Swarm portlarina erisim):

```hcl
rule {
  direction   = "in"
  protocol    = "tcp"
  port        = "2377"
  source_ips  = [local.db_subnet_cidr]
  description = "Docker Swarm control plane from DB subnet"
}

rule {
  direction   = "in"
  protocol    = "tcp"
  port        = "7946"
  source_ips  = [local.db_subnet_cidr]
  description = "Docker Swarm node discovery (TCP) from DB subnet"
}

rule {
  direction   = "in"
  protocol    = "udp"
  port        = "7946"
  source_ips  = [local.db_subnet_cidr]
  description = "Docker Swarm node discovery (UDP) from DB subnet"
}

rule {
  direction   = "in"
  protocol    = "udp"
  port        = "4789"
  source_ips  = [local.db_subnet_cidr]
  description = "Docker Swarm VXLAN overlay from DB subnet"
}
```

`hcloud_firewall.db` icine (app subnet'ten Swarm portlarina erisim):

```hcl
rule {
  direction   = "in"
  protocol    = "tcp"
  port        = "2377"
  source_ips  = [local.app_subnet_cidr]
  description = "Docker Swarm control plane from app subnet"
}

rule {
  direction   = "in"
  protocol    = "tcp"
  port        = "7946"
  source_ips  = [local.app_subnet_cidr]
  description = "Docker Swarm node discovery (TCP) from app subnet"
}

rule {
  direction   = "in"
  protocol    = "udp"
  port        = "7946"
  source_ips  = [local.app_subnet_cidr]
  description = "Docker Swarm node discovery (UDP) from app subnet"
}

rule {
  direction   = "in"
  protocol    = "udp"
  port        = "4789"
  source_ips  = [local.app_subnet_cidr]
  description = "Docker Swarm VXLAN overlay from app subnet"
}
```

Sonra uygula:

```bash
cd terraform/hetzner/test
terraform apply
```

## 2. DB Node'u Swarm'a Ekleme

**iklim-app-01 uzerinde** join token al:

```bash
docker swarm join-token worker
```

**iklim-db-01 uzerinde** Swarm'a katil:

```bash
docker swarm join --token <TOKEN> 10.10.10.11:2377
```

**iklim-app-01 uzerinde** node'u etiketle:

```bash
docker node update --label-add role=db iklim-db-01
docker node ls
```

## 3. StorageBox Dizin Yapisi

**iklim-db-01 uzerinde:**

```bash
mkdir -p /mnt/storagebox/test/db/postgresql/data
mkdir -p /mnt/storagebox/test/db/mongodb/data
mkdir -p /mnt/storagebox/test/db/mongodb/log
mkdir -p /mnt/storagebox/test/db/mongodb/config
```

## 4. PostgreSQL Stack

### mongod.conf

`/mnt/storagebox/test/db/mongodb/config/mongod.conf` dosyasini olustur:

```yaml
processManagement:
  pidFilePath: "/data/db/mongod.pid"
net:
  port: 27017
storage:
  engine: "wiredTiger"
  dbPath: "/data/db"
  directoryPerDB: true
systemLog:
  verbosity: 0
  timeStampFormat: "iso8601-local"
  destination: file
  path: "/data/log/mongo.log"
  logAppend: true
  logRotate: rename
security:
  authorization: enabled
```

### Stack Dosyasi

`/opt/iklimco/stacks/db.yml`:

```yaml
version: "3.8"

networks:
  iklimco-net:
    external: true

services:
  postgresql:
    image: postgis/postgis:17-3.5
    environment:
      POSTGRES_USER: "${DATABASE_POSTGRES_ROOT_USER}"
      POSTGRES_PASSWORD: "${POSTGRES_PASSWORD}"
      POSTGRES_DB: postgres
      PGDATA: /var/lib/postgresql/data/pgdata
      TZ: "Europe/Istanbul"
    volumes:
      - /mnt/storagebox/test/db/postgresql/data:/var/lib/postgresql/data
      - /opt/iklimco/init/postgresql:/docker-entrypoint-initdb.d:ro
    networks:
      - iklimco-net
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.labels.role == db
      restart_policy:
        condition: on-failure

  mongodb:
    image: mongo:8
    environment:
      MONGO_INITDB_ROOT_USERNAME: mongo-root
      MONGO_INITDB_ROOT_PASSWORD: "${MONGO_ROOT_PASSWORD}"
    volumes:
      - /mnt/storagebox/test/db/mongodb/data:/data/db
      - /mnt/storagebox/test/db/mongodb/log:/data/log
      - /mnt/storagebox/test/db/mongodb/config:/data/configdb
    networks:
      - iklimco-net
    command: ["--config", "/data/configdb/mongod.conf"]
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.labels.role == db
      restart_policy:
        condition: on-failure
```

### .env Dosyasi

`/opt/iklimco/stacks/.env` (repo'ya commit edilmez):

```env
DATABASE_POSTGRES_ROOT_USER=<kullanici-adi>
POSTGRES_PASSWORD=<guclu-sifre>
MONGO_ROOT_PASSWORD=<guclu-sifre>
```

## 5. Deploy

```bash
# iklim-app-01 uzerinde (Swarm manager)
docker stack deploy --compose-file /opt/iklimco/stacks/db.yml \
  --with-registry-auth \
  $(set -a; source /opt/iklimco/stacks/.env; set +a; echo "") \
  iklim-db
```

Alternatif olarak env-file destegi icin:

```bash
docker stack deploy \
  --compose-file <(docker-compose -f /opt/iklimco/stacks/db.yml config) \
  iklim-db
```

Kontrol:

```bash
docker stack services iklim-db
docker service logs iklim-db_postgresql
docker service logs iklim-db_mongodb
```

## 6. App Servislerinden Erisim

Overlay network (`iklimco-net`) uzerinden servis adlariyla erisim:

| Servis | Host (overlay DNS) | Port |
| --- | --- | --- |
| PostgreSQL | `iklim-db_postgresql` | `5432` |
| MongoDB | `iklim-db_mongodb` | `27017` |

Spring Boot vb. uygulama konfigurasyon ornegi:

```
spring.datasource.url=jdbc:postgresql://iklim-db_postgresql:5432/iklimdb
spring.data.mongodb.uri=mongodb://mongo-root:<sifre>@iklim-db_mongodb:27017/iklimdb?authSource=admin
```

## Kabul Kriterleri

- `docker stack services iklim-db` her iki servisi `1/1` olarak gosterir.
- `iklim-app-01` uzerinden `postgresql` servisine TCP 5432 overlay ile ulasilabilir.
- `iklim-app-01` uzerinden `mongodb` servisine TCP 27017 overlay ile ulasilabilir.
- `/mnt/storagebox/test/db/postgresql/data/` dizininde veri dosyalari olusur.
- Servis yeniden baslatildiginda veri korunur.
- `5432` ve `27017` portlari public internet'ten kapalidir.