implement docker cron job

.gitignore

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+.idea

Dockerfile

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+# Use Ubuntu 20.04 as the base image
+FROM ubuntu:20.04
+
+# Install dependencies
+RUN apt-get update && apt-get install -y \
+    sqlite3 \
+    awscli \
+    cron \
+    tar \
+    gzip \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create necessary directories
+RUN mkdir -p /jobs/data/sqlite
+RUN mkdir -p /var/tmp
+
+# Copy the backup script into the container
+COPY backup_sqlite.sh /usr/local/bin/backup_script.sh
+
+# Make the script executable
+RUN chmod +x /usr/local/bin/backup_script.sh
+
+# Create the cron log file
+RUN touch /var/log/cron.log
+
+# Copy the cron job file into the cron.d directory
+COPY backup_cron /etc/cron.d/backup_cron
+
+# Set permissions for the cron job file
+RUN chmod 0644 /etc/cron.d/backup_cron
+
+# Apply the cron job
+RUN crontab /etc/cron.d/backup_cron
+
+# Expose the cron log file as a volume
+VOLUME /var/log
+
+# Start cron in the foreground when the container starts
+CMD ["cron", "-f"]

backup_cron

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+0 2 * * * root /usr/local/bin/backup_script.sh -l true >> /var/log/cron.log 2>&1

backup_sqlite.sh

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+#!/bin/bash
+
+DB_PATH="/jobs/data/sqlite/nkode.db"
+BACKUP_DIR="/var/tmp"
+
+BACKUP_NAME="backup_nkode_$(date +'%Y%m%d%H%M%S').tar.gz"
+
+# Check if the database file exists
+if [ ! -f "$DB_PATH" ]; then
+    echo "Error: Database file not found at $DB_PATH"
+    exit 1
+fi
+
+# Perform a WAL checkpoint to flush the WAL file to the main DB file
+echo "Checkpointing WAL..."
+sqlite3 "$DB_PATH" "PRAGMA wal_checkpoint(FULL);"
+if [ $? -ne 0 ]; then
+    echo "Error: Failed to checkpoint WAL"
+    exit 1
+fi
+
+# Check if related files (.wal, .shm) exist
+WAL_FILE="${DB_PATH}-wal"
+SHM_FILE="${DB_PATH}-shm"
+
+# Create a list of files to back up (main DB, WAL, and SHM if they exist)
+FILES_TO_BACKUP=("$DB_PATH")
+if [ -f "$WAL_FILE" ]; then
+    FILES_TO_BACKUP+=("$WAL_FILE")
+fi
+if [ -f "$SHM_FILE" ]; then
+    FILES_TO_BACKUP+=("$SHM_FILE")
+fi
+
+# Create a tar.gz archive of the database and related files
+echo "Creating backup..."
+tar -czf "$BACKUP_DIR/$BACKUP_NAME" "${FILES_TO_BACKUP[@]}"
+if [ $? -eq 0 ]; then
+    echo "Backup successful: $BACKUP_DIR/$BACKUP_NAME"
+else
+    echo "Error: Backup failed"
+    exit 1
+fi
+
+# Upload backup to S3
+aws s3 cp "$BACKUP_DIR/$BACKUP_NAME" s3://nkode-db-backup
+if [ $? -eq 0 ]; then
+    echo "Backup uploaded to S3 successfully."
+else
+    echo "Error: Failed to upload backup to S3."
+    exit 1
+fi

docker-compose.yaml

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+services:
+  go-nkode:
+    container_name: cron-nkode
+    image: registry.infra.nkode.tech/cron-nkode
+    volumes:
+      - /var/go-nkode/sqlite:/jobs/data/sqlite
+
+    environment:
+      - AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID}
+      - AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY}
+      - AWS_REGION=${AWS_REGION}

docker_build.sh

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+docker buildx build --platform linux/amd64,linux/arm64 -t registry.infra.nkode.tech/cron-nkode:latest --push .