From e2c51c2b1ed0f9c262ac44dddf65b0575a368059 Mon Sep 17 00:00:00 2001
From: mbahsomo <mbahsomo@gmail.com>
Date: Mon, 16 Feb 2026 01:02:48 +0000
Subject: [PATCH] Add system-lof.md

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+Untuk menambahkan **error log** pada service `systemd`, gunakan directive berikut di bagian `[Service]`:
+
+* `StandardOutput=` → log output normal
+* `StandardError=` → log error
+* arahkan ke file dengan `append:` atau `file:`
+
+Contoh lengkap:
+
+```
+[Unit]
+Description=Aplikasi Pasar
+
+[Service]
+Type=simple
+Restart=always
+RestartSec=5s
+User=root
+WorkingDirectory=/home/api/
+ExecStart=/home/api/delamonganpasarapi
+
+# log output dan error ke file
+StandardOutput=append:/var/log/delamonganpasarapi.log
+StandardError=append:/var/log/delamonganpasarapi-error.log
+
+# optional: buat identifier di journalctl
+SyslogIdentifier=delamonganpasarapi
+
+[Install]
+WantedBy=multi-user.target
+```
+
+---
+
+## Buat file log dan set permission
+
+Jalankan:
+
+```bash
+sudo touch /var/log/delamonganpasarapi.log
+sudo touch /var/log/delamonganpasarapi-error.log
+sudo chmod 644 /var/log/delamonganpasarapi*.log
+```
+
+Atau jika service jalan sebagai user tertentu:
+
+```bash
+sudo chown root:root /var/log/delamonganpasarapi*.log
+```
+
+---
+
+## Reload dan restart service
+
+Setelah edit file service:
+
+```bash
+sudo systemctl daemon-reexec
+sudo systemctl daemon-reload
+sudo systemctl restart delamonganpasarapi
+```
+
+---
+
+## Cara melihat log
+
+### 1. Dari file log
+
+```
+tail -f /var/log/delamonganpasarapi.log
+tail -f /var/log/delamonganpasarapi-error.log
+```
+
+### 2. Dari journalctl (recommended)
+
+```
+journalctl -u delamonganpasarapi -f
+```
+
+atau
+
+```
+journalctl -u delamonganpasarapi -n 100
+```
+
+---
+
+## Best practice (recommended)
+
+Sebenarnya systemd sudah menyimpan log otomatis, jadi cukup gunakan:
+
+```
+journalctl -u delamonganpasarapi
+```
+
+File log manual hanya diperlukan jika:
+
+* ingin integrasi dengan logrotate
+* ingin file log terpisah
+* ingin dibaca aplikasi lain
+
+---
+
+## Bonus: log rotation otomatis
+
+Buat file:
+
+```
+sudo nano /etc/logrotate.d/delamonganpasarapi
+```
+
+isi:
+
+```
+/var/log/delamonganpasarapi*.log {
+    daily
+    rotate 14
+    compress
+    missingok
+    notifempty
+    copytruncate
+}
+```
+