====== Runbook: Health Check ======

<WRAP round info>
**Trajanje:** ~2 minute \\
**Uloga:** Gateway-Operator \\
**Ucestalost:** Dnevno / Automatizirano
</WRAP>

Provjera dostupnosti i funkcionalnosti Gatewaya.

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===== Tijek rada =====

<mermaid>
flowchart TD
    A[Health Check pokrenuti] --> B[/health Endpoint]
    B --> C{Healthy?}
    C -->|Da| D[API test]
    C -->|Ne| E[Logove provjeriti]
    D --> F{Podaci vraceni?}
    F -->|Da| G[OK - Gotovo]
    F -->|Ne| H[DSN provjeriti]
    E --> I[Server ponovno pokrenuti]
    H --> I

    style G fill:#e8f5e9
    style E fill:#ffebee
    style H fill:#fff3e0
</mermaid>

----

===== 1. Basic Health Check =====

<code bash>
# Jednostavan Health Check
curl -s -o /dev/null -w "%{http_code}" http://localhost:5000/health

# Ocekivani odgovor: 200
</code>

<code bash>
# S Response-Body
curl -s http://localhost:5000/health

# Ocekivani odgovor: "Healthy"
</code>

----

===== 2. Extended Health Check =====

<code bash>
# Swagger dostupan?
curl -s -o /dev/null -w "%{http_code}" http://localhost:5000/swagger

# API verziju provjeriti
curl -s http://localhost:5000/api/v1/info | jq
</code>

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===== 3. DSN konnektivnost =====

<code bash>
# Sve DSN proci
for dsn in demo produktion reporting; do
  echo "Testing $dsn..."
  curl -s -o /dev/null -w "$dsn: %{http_code}\n" \
    "http://localhost:5000/api/v1/dsn/$dsn/tables"
done
</code>

**PowerShell verzija:**

<code powershell>
$dsns = @("demo", "produktion", "reporting")
foreach ($dsn in $dsns) {
    $result = Invoke-WebRequest -Uri "http://localhost:5000/api/v1/dsn/$dsn/tables" -UseBasicParsing
    Write-Host "$dsn : $($result.StatusCode)"
}
</code>

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===== 4. Vrijeme odgovora mjeriti =====

<code bash>
# Pojedinacni upit
curl -s -o /dev/null -w "Vrijeme: %{time_total}s\n" \
  "http://localhost:5000/api/v1/dsn/demo/tables/Products?\$top=10"

# Vise prolaza
for i in {1..5}; do
  curl -s -o /dev/null -w "%{time_total}\n" \
    "http://localhost:5000/api/v1/dsn/demo/tables/Products?\$top=10"
done | awk '{sum+=$1} END {print "Prosjek: " sum/NR "s"}'
</code>

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===== 5. Kontrolna lista =====

| # | Provjera | Ocekivanje | Da/Ne |
|---|-----------|-----------|---|
| 1 | /health | 200 + "Healthy" | - |
| 2 | /swagger | 200 | - |
| 3 | DSN "demo" dostupna | 200 | - |
| 4 | Vrijeme odgovora | < 1s | - |
| 5 | Nema gresaka u logovima | Nema ERROR | - |

----

===== Automatizirani Health Check =====

**Cron (Linux):**

<code bash>
# /etc/cron.d/gateway-health
*/5 * * * * root curl -sf http://localhost:5000/health || systemctl restart data-gateway
</code>

**Scheduled Task (Windows):**

<code powershell>
# health-check.ps1
$response = Invoke-WebRequest -Uri "http://localhost:5000/health" -UseBasicParsing -TimeoutSec 5
if ($response.StatusCode -ne 200) {
    Restart-Service -Name "DataGateway" -Force
    Send-MailMessage -To "admin@example.com" -Subject "Gateway Restart" -Body "Gateway je automatski ponovno pokrenut"
}
</code>

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===== Rjesavanje problema =====

| Problem | Uzrok | Rjesenje |
|---------|---------|--------|
| ''Connection refused'' | Gateway nije pokrenut | Server pokrenuti |
| ''503 Service Unavailable'' | Startup jos nije zavrsen | 30s pricekati, ponovno provjeriti |
| ''500 Internal Server Error'' | Config greska | Logove provjeriti |
| Timeout | Gateway preopterecen | Opterecenje smanjiti, resurse povecati |

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===== Pragovi =====

| Metrika | Zeleno | Zuto | Crveno |
|--------|------|------|-----|
| Vrijeme odgovora | < 500ms | 500ms-2s | > 2s |
| Error-Rate | < 1% | 1-5% | > 5% |
| CPU | < 50% | 50-80% | > 80% |
| Memory | < 70% | 70-90% | > 90% |

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===== Povezani runbookovi =====

  * [[.:server-starten|Server pokrenuti]] - Kod ispada
  * [[.:logs-pruefen|Provjera logova]] - Analiza gresaka
  * [[..:monitoring:prometheus|Prometheus]] - Automatski monitoring

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<< [[.:dsn-verwalten|<- DSN upravljanje]] | [[.:logs-pruefen|-> Provjera logova]] >>

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//Wolfgang van der Stille @ EMSR DATA d.o.o. - Data Gateway Professional//

{{tag>operator runbook health check monitoring}}