simple minecraft server status / running script for local/lan server

mc.sh

#!/bin/bash

# === Configuration Variables ===
SCREEN_NAME="mc"                   # Screen session name for Minecraft
SERVER_JAR="server.jar"             # Minecraft server jar file
MEMORY="-Xmx1024M -Xms1024M"        # Java memory allocation for the server
SERVER_PATH="/root/services/minecraft"  # Path to your Minecraft server directory
BACKUP_PATH="/root/services/minecraft-backups"  # Path to store backups
BACKUP_RETENTION_DAYS=14            # Number of days to retain backups

# Files and directories to exclude from backup
EXCLUDE_FILES=(
    "$SERVER_JAR"                   # Exclude the server JAR file
    "./libraries/*"                 # Exclude the libraries folder
    "./versions/*"                  # Exclude the versions folder
    "./logs/*"                      # Exclude the logs folder
)

# === Function to start the server ===
start_server() {
    if screen -list | grep -q "$SCREEN_NAME"; then
        echo "Minecraft server is already running!"
    else
        echo "Starting Minecraft server..."
        cd "$SERVER_PATH"
        screen -AmdLS "$SCREEN_NAME" java $MEMORY -jar "$SERVER_JAR" nogui
        echo "Minecraft server started."
    fi
}

# === Function to stop the server ===
stop_server() {
    if screen -list | grep -q "$SCREEN_NAME"; then
        echo "Saving the world and stopping Minecraft server..."
        screen -S "$SCREEN_NAME" -X stuff "save-all\n"  # Save the world
        sleep 2  # Give it time to save
        screen -S "$SCREEN_NAME" -X stuff "stop\n"  # Stop the server
        sleep 5  # Allow some time for the server to shut down
        echo "Minecraft server stopped."
    else
        echo "Minecraft server is not running!"
    fi
}

# === Function to check the status of the server ===
status_server() {
    if screen -list | grep -q "$SCREEN_NAME"; then
        echo "Minecraft server is running."
    else
        echo "Minecraft server is not running."
    fi
}

# === Function to create a backup ===
backup_server() {
    echo "Backing up the Minecraft server..."

    # Stop the server and save the world before backing up
    stop_server

    # Create timestamp for the backup
    TIMESTAMP=$(date +"%Y-%m-%d_%H-%M-%S")
    BACKUP_FILE="$BACKUP_PATH/minecraft-backup-$TIMESTAMP.zip"
    
    # Ensure the backup directory exists
    mkdir -p "$BACKUP_PATH"

    # Change to the server directory to ensure correct paths
    cd "$SERVER_PATH"

    # Prepare the exclude options for the zip command
    EXCLUDE_ARGS=()
    for FILE in "${EXCLUDE_FILES[@]}"; do
        EXCLUDE_ARGS+=("-x" "$FILE")
    done

    # Create a zip backup of the server directory, excluding specified files and directories
    echo "Creating backup..."
    zip -r "$BACKUP_FILE" . "${EXCLUDE_ARGS[@]}"
    
    echo "Backup created: $BACKUP_FILE"

    # Delete backups older than the retention period
    find "$BACKUP_PATH" -type f -name "*.zip" -mtime +$BACKUP_RETENTION_DAYS -exec rm {} \;
    echo "Old backups (older than $BACKUP_RETENTION_DAYS days) have been deleted."

    # Start the server again after the backup
    start_server
}

# === Function to send a Minecraft command to the server ===
send_command() {
    if screen -list | grep -q "$SCREEN_NAME"; then
        COMMAND="$*"
        echo "Sending command to Minecraft server: $COMMAND"
        screen -S "$SCREEN_NAME" -X stuff "$COMMAND\n"
        echo "Command sent."
    else
        echo "Minecraft server is not running!"
    fi
}

# === Main script logic ===
case "$1" in
    start)
        start_server
        ;;
    stop)
        stop_server
        ;;
    status)
        status_server
        ;;
    restart)
        stop_server
        sleep 5
        start_server
        ;;
    backup)
        backup_server
        ;;
    cmd)
        shift
        send_command "$@"
        ;;
    *)
        echo "Usage: $0 {start|stop|status|restart|backup|cmd <minecraft-command>}"
        exit 1
        ;;
esac