====== Runbook: Provjera logova ======

<WRAP round info>
**Trajanje:** ~10 minuta \\
**Uloga:** Gateway-Operator \\
**Ucestalost:** Dnevno / Kod problema
</WRAP>

Analiza Gateway logova za dijagnozu gresaka i monitoring.

----

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

<mermaid>
flowchart TD
    A[Logove otvoriti] --> B[Filtrirati po ERROR]
    B --> C{Greska pronadena?}
    C -->|Da| D[Gresku analizirati]
    C -->|Ne| E[Filtrirati po WARN]
    D --> F[Poduzeti mjere]
    E --> G{Upozorenja?}
    G -->|Da| H[Dokumentirati]
    G -->|Ne| I[OK - Gotovo]
    F --> I
    H --> I

    style I fill:#e8f5e9
    style D fill:#ffebee
    style H fill:#fff3e0
</mermaid>

----

===== 1. Lokacije logova =====

| Platforma | Put |
|-----------|------|
| Windows (Konzola) | Konzolni izlaz |
| Windows (Service) | ''%GATEWAY_ROOT%\logs\'' ili Event Log |
| Linux (systemd) | ''journalctl -u data-gateway'' |
| Docker | ''docker logs gateway'' |

----

===== 2. Posljednje logove prikazati =====

**Windows (Datoteka):**

<code powershell>
# Zadnjih 50 linija
Get-Content -Path "%GATEWAY_ROOT%\logs\gateway.log" -Tail 50

# Live-Tail
Get-Content -Path "%GATEWAY_ROOT%\logs\gateway.log" -Wait -Tail 10
</code>

**Linux (systemd):**

<code bash>
# Zadnjih 100 linija
journalctl -u data-gateway -n 100 --no-pager

# Live-Tail
journalctl -u data-gateway -f
</code>

**Docker:**

<code bash>
# Zadnjih 100 linija
docker logs --tail 100 gateway

# Live-Tail
docker logs -f gateway
</code>

----

===== 3. Filtrirati po greskama =====

**Windows:**

<code powershell>
# ERROR unosi
Select-String -Path "%GATEWAY_ROOT%\logs\*.log" -Pattern "ERROR|Exception"

# Danas
Get-Content "%GATEWAY_ROOT%\logs\gateway.log" | Where-Object { $_ -match "ERROR" -and $_ -match (Get-Date -Format "yyyy-MM-dd") }
</code>

**Linux:**

<code bash>
# ERROR unosi
journalctl -u data-gateway --since today | grep -E "ERROR|Exception"

# Ili u datoteci
grep -E "ERROR|Exception" /var/log/gateway/gateway.log
</code>

----

===== 4. Cesti log uzorci =====

**Uspjesan zahtjev:**
<code>
[INFO] GET /api/v1/dsn/demo/tables 200 45ms
</code>

**Greska:**
<code>
[ERROR] GET /api/v1/dsn/invalid/tables 404 Database 'invalid' not found
[ERROR] POST /api/v1/dsn/demo/query 500 SqlException: Invalid syntax
</code>

**Upozorenje:**
<code>
[WARN] Slow query detected: 2340ms for GET /api/v1/dsn/produktion/tables/BigTable
</code>

----

===== 5. Log-Level prilagoditi =====

U ''appsettings.json'':

<code javascript>
{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "WvdS.WebAPI.Data.Gateway": "Debug"
    }
  }
}
</code>

| Level | Upotreba |
|-------|------------|
| ''Trace'' | Vrlo detaljno (Razvoj) |
| ''Debug'' | Debugging informacije |
| ''Information'' | Normalne operacije (Standard) |
| ''Warning'' | Potencijalni problemi |
| ''Error'' | Greske koje su obradene |
| ''Critical'' | Teske greske, pad |

----

===== 6. Kontrolna lista =====

| # | Provjera | Da/Ne |
|---|-----------|---|
| 1 | ERROR unosi pregledani | - |
| 2 | WARN unosi pregledani | - |
| 3 | Slow Queries zabilježeni | - |
| 4 | Greske dokumentirane/prijavljene | - |
| 5 | Log-Rotation aktivna | - |

----

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

| Log poruka | Uzrok | Rjesenje |
|-------------|---------|--------|
| ''Database not found'' | DSN nije konfigurirana | appsettings.json provjeriti |
| ''Connection refused'' | DB nije dostupna | Firewall/Mrezu provjeriti |
| ''SqlException: Login failed'' | Pogresni Credentiali | Lozinku provjeriti |
| ''OutOfMemoryException'' | Preveliki upit | ''$top'' Limit postaviti |
| ''Timeout expired'' | DB prespora | Index optimizirati |

----

===== Log-Rotation postaviti =====

**Serilog (appsettings.json):**

<code javascript>
{
  "Serilog": {
    "WriteTo": [
      {
        "Name": "File",
        "Args": {
          "path": "logs/gateway-.log",
          "rollingInterval": "Day",
          "retainedFileCountLimit": 30
        }
      }
    ]
  }
}
</code>

----

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

  * [[.:health-check|Health Check]] - Provjera dostupnosti
  * [[.:server-starten|Server pokrenuti]] - Kod pada
  * [[..:monitoring:alerting|Alerting]] - Automatske obavijesti

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<< [[.:health-check|<- Health Check]] | [[..:start|-> Operator pregled]] >>

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

{{tag>operator runbook logs troubleshooting}}