{"id":4050,"date":"2025-10-12T19:32:38","date_gmt":"2025-10-12T19:32:38","guid":{"rendered":"https:\/\/learnbydoing.dev\/?p=4050"},"modified":"2026-01-10T21:54:36","modified_gmt":"2026-01-10T21:54:36","slug":"managing-and-creating-lifecycle-nodes-in-ros-2","status":"publish","type":"post","link":"https:\/\/learnbydoing.dev\/managing-and-creating-lifecycle-nodes-in-ros-2\/","title":{"rendered":"Managing and Creating Lifecycle Nodes in ROS 2"},"content":{"rendered":"
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  • \n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\tROS 2<\/span>, Tutoriales<\/span>\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    When developing complex robotic systems, the ability to precisely control the operational state of each node is essential to ensure reliability, safety, and maintainability. ROS 2 addresses this need through a key concept: Lifecycle Nodes<\/strong>.

    Unlike regular nodes that start operating as soon as they are launched, Lifecycle Nodes allow you to manage their life cycle through well-defined states and transitions. This means you can decide when<\/em> a node should start working, when<\/em> it should pause, and when<\/em> it should shut down, giving you complete control over the system\u2019s behavior.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    \ud83e\uddd0 What Is a Lifecycle Node?<\/strong><\/h3>

    A Lifecycle Node<\/strong> \u2013 also known as a Managed Node<\/em> \u2013 is a ROS 2 node that follows a structured life cycle composed of multiple operational phases.

    When launched, the node starts in the Unconfigured<\/strong> state, meaning the code is loaded but resources are not yet initialized. From there, it can transition to the Inactive<\/strong> state, where the node is configured but not yet active\u2014publishers, timers, and actions remain disabled. Then, with another transition, it enters the Active<\/strong> state, becoming fully operational, publishing data, and communicating with other system components.

    When the node needs to stop or restart, it can move to the Deactivated<\/strong> or Finalized<\/strong> states, releasing resources in a safe and controlled manner.

    <\/p>

    These transitions can be triggered manually through the ROS 2 CLI or automatically by other nodes in the system. Each transition can be linked to a callback<\/strong>, a function defining what happens when the node enters or leaves a specific state.

    This approach allows developers to orchestrate the system\u2019s behavior predictably, preventing race conditions or initialization errors.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    <\/> Creating a Lifecycle Node in Python<\/strong><\/h3>
    To better understand how this mechanism works, let\u2019s look at a practical example.
    In ROS 2, we can implement a Lifecycle Node in Python using the rclpy<\/code> API.

    Here\u2019s a complete example:<\/strong><\/h6>

    <\/code><\/p>

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    \n\t\t\t\t\n\t\t\t\t\tfrom rclpy.lifecycle import Node\r\nfrom rclpy.lifecycle import State\r\nfrom rclpy.lifecycle import TransitionCallbackReturn\r\nimport rclpy\r\n\r\nclass MyLifecycleNode(Node):\r\n\r\n    def __init__(self):\r\n        super().__init__('my_lifecycle_node')\r\n\r\n    def on_configure(self, state: State):\r\n        self.get_logger().info('Configuring...')\r\n        return TransitionCallbackReturn.SUCCESS\r\n\r\n    def on_activate(self, state: State):\r\n        self.get_logger().info('Activating...')\r\n        return TransitionCallbackReturn.SUCCESS\r\n\r\n    def on_deactivate(self, state: State):\r\n        self.get_logger().info('Deactivating...')\r\n        return TransitionCallbackReturn.SUCCESS\r\n\r\n    def on_cleanup(self, state: State):\r\n        self.get_logger().info('Cleaning up...')\r\n        return TransitionCallbackReturn.SUCCESS\r\n\r\n    def on_shutdown(self, state: State):\r\n        self.get_logger().info('Shutting down...')\r\n        return TransitionCallbackReturn.SUCCESS\r\n\r\n\r\ndef main(args=None):\r\n    rclpy.init(args=args)\r\n    lc_node = MyLifecycleNode()\r\n    rclpy.spin(lc_node)\r\n    rclpy.shutdown()\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-961c2f7 elementor-widget elementor-widget-text-editor\" data-id=\"961c2f7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"2586\" data-end=\"2639\"><strong>\ud83e\udde0 Breaking Down the Code<\/strong><\/h3><p data-start=\"1530\" data-end=\"1656\"><code data-start=\"1690\" data-end=\"1695\"><\/code><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e7f727e elementor-widget elementor-widget-text-editor\" data-id=\"e7f727e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Importing the Required Modules<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-635f0ee elementor-widget elementor-widget-code-highlight\" data-id=\"635f0ee\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python line-numbers\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>from rclpy.lifecycle import Node\r\nfrom rclpy.lifecycle import State\r\nfrom rclpy.lifecycle import TransitionCallbackReturn\r\nimport rclpy\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-424d237 elementor-widget elementor-widget-text-editor\" data-id=\"424d237\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"4742\" data-end=\"4808\">These lines import all the necessary modules for working with Lifecycle Nodes in ROS 2.<br data-start=\"3684\" data-end=\"3687\" \/><code data-start=\"3687\" data-end=\"3693\">Node<\/code> is the base class for all Lifecycle Nodes, <code data-start=\"3737\" data-end=\"3744\">State<\/code> represents the current node state, and <code data-start=\"3784\" data-end=\"3810\">TransitionCallbackReturn<\/code> is used to report the outcome of a transition.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fc6df44 elementor-widget elementor-widget-text-editor\" data-id=\"fc6df44\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Defining the Lifecycle Node Class<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-34e2893 elementor-widget elementor-widget-code-highlight\" data-id=\"34e2893\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>class MyLifecycleNode(Node):\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0ed0bb9 elementor-widget elementor-widget-text-editor\" data-id=\"0ed0bb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"3907\" data-end=\"4070\">Here, we define a class called <code data-start=\"3938\" data-end=\"3955\">MyLifecycleNode<\/code> that inherits from <code data-start=\"3975\" data-end=\"3981\">Node<\/code>.<br data-start=\"3982\" data-end=\"3985\" \/>This inheritance gives our class all the functionalities of a managed Lifecycle Node.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ce4d0a2 elementor-widget elementor-widget-text-editor\" data-id=\"ce4d0a2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Initializing the Node<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fbbfe30 elementor-widget elementor-widget-code-highlight\" data-id=\"fbbfe30\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>def __init__(self):\r\n    super().__init__('my_lifecycle_node')\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dc28add elementor-widget elementor-widget-text-editor\" data-id=\"dc28add\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"4153\" data-end=\"4283\">The constructor initializes the node and assigns it the name <code data-start=\"4214\" data-end=\"4233\">my_lifecycle_node<\/code>, which is how it will appear in the ROS 2 system.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-980e7b9 elementor-widget elementor-widget-text-editor\" data-id=\"980e7b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Configuring the Node<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7da3562 elementor-widget elementor-widget-code-highlight\" data-id=\"7da3562\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>def on_configure(self, state: State):\r\n    self.get_logger().info('Configuring...')\r\n    return TransitionCallbackReturn.SUCCESS\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a73b77a elementor-widget elementor-widget-text-editor\" data-id=\"a73b77a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The <code data-start=\"4435\" data-end=\"4451\">on_configure()<\/code> callback is executed when the node transitions from <em data-start=\"4504\" data-end=\"4518\">unconfigured<\/em> to <em data-start=\"4522\" data-end=\"4532\">inactive<\/em>.<br data-start=\"4533\" data-end=\"4536\" \/>This is where you typically load parameters, open connections, or initialize sensors and resources.<br data-start=\"4635\" data-end=\"4638\" \/>The return value communicates whether the transition succeeded.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1ede619 elementor-widget elementor-widget-text-editor\" data-id=\"1ede619\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Activating the Node<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9790003 elementor-widget elementor-widget-code-highlight\" data-id=\"9790003\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>def on_activate(self, state: State):\r\n    self.get_logger().info('Activating...')\r\n    return TransitionCallbackReturn.SUCCESS\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-09ad431 elementor-widget elementor-widget-text-editor\" data-id=\"09ad431\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1569\" data-end=\"1754\">The <code data-start=\"4851\" data-end=\"4866\">on_activate()<\/code> callback runs when the node becomes <em data-start=\"4903\" data-end=\"4911\">active<\/em>, meaning it is now fully operational.<br data-start=\"4949\" data-end=\"4952\" \/>Here, the node starts publishing data, executing timers, or performing actions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-63c6343 elementor-widget elementor-widget-text-editor\" data-id=\"63c6343\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Deactivating the Node<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-41dc26a elementor-widget elementor-widget-code-highlight\" data-id=\"41dc26a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>def on_deactivate(self, state: State):\r\n    self.get_logger().info('Deactivating...')\r\n    return TransitionCallbackReturn.SUCCESS\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a962652 elementor-widget elementor-widget-text-editor\" data-id=\"a962652\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1949\" data-end=\"2139\"><code data-start=\"5181\" data-end=\"5198\">on_deactivate()<\/code> is triggered when the node transitions from <em data-start=\"5243\" data-end=\"5251\">active<\/em> to <em data-start=\"5255\" data-end=\"5265\">inactive<\/em>.<br data-start=\"5266\" data-end=\"5269\" \/>At this stage, publishers and periodic operations are suspended while keeping resources allocated.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-67f880e elementor-widget elementor-widget-text-editor\" data-id=\"67f880e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Cleaning Up the Node<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c2c1ba4 elementor-widget elementor-widget-code-highlight\" data-id=\"c2c1ba4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>def on_cleanup(self, state: State):\r\n    self.get_logger().info('Cleaning up...')\r\n    return TransitionCallbackReturn.SUCCESS\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b70a0c1 elementor-widget elementor-widget-text-editor\" data-id=\"b70a0c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The <code data-start=\"5517\" data-end=\"5531\">on_cleanup()<\/code> callback releases resources and returns the node to the <em data-start=\"5588\" data-end=\"5602\">unconfigured<\/em> state.<br data-start=\"5609\" data-end=\"5612\" \/>This is useful when you want to reconfigure a node without restarting the whole system.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dfb2cbf elementor-widget elementor-widget-text-editor\" data-id=\"dfb2cbf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Shutting Down the Node<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6b53ddc elementor-widget elementor-widget-code-highlight\" data-id=\"6b53ddc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>def on_shutdown(self, state: State):\r\n    self.get_logger().info('Shutting down...')\r\n    return TransitionCallbackReturn.SUCCESS\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f590093 elementor-widget elementor-widget-text-editor\" data-id=\"f590093\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"6403\" data-end=\"6591\">The <code data-start=\"5852\" data-end=\"5867\">on_shutdown()<\/code> callback executes when the node is shutting down permanently.<br data-start=\"5929\" data-end=\"5932\" \/>Here, you can save data, close files, or safely disconnect hardware components.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-29f166a elementor-widget elementor-widget-text-editor\" data-id=\"29f166a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5><strong>Running the Main Function<\/strong><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8759947 elementor-widget elementor-widget-code-highlight\" data-id=\"8759947\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>def main(args=None):\r\n    rclpy.init(args=args)\r\n    lc_node = MyLifecycleNode()\r\n    rclpy.spin(lc_node)\r\n    rclpy.shutdown()\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-acb53bd elementor-widget elementor-widget-text-editor\" data-id=\"acb53bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"6798\" data-end=\"6840\">The <code data-start=\"6160\" data-end=\"6168\">main()<\/code> function initializes ROS 2, creates the node instance, keeps it running with <code data-start=\"6246\" data-end=\"6260\">rclpy.spin()<\/code>, and shuts it down cleanly when finished.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4e43d6f elementor-widget elementor-widget-text-editor\" data-id=\"4e43d6f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"6311\" data-end=\"6364\"><strong>\ud83d\udccb Managing Lifecycle Nodes from the Command Line<\/strong><\/h3><p data-start=\"6366\" data-end=\"6672\">Once the node is running, you can control its state directly from the terminal.<br data-start=\"6445\" data-end=\"6448\" \/>ROS 2 provides a dedicated CLI tool for managing Lifecycle Nodes, allowing you to configure, activate, deactivate, clean up, or shut down nodes easily.<br \/><br data-start=\"6599\" data-end=\"6602\" \/>For example, to manage a node named <code data-start=\"6638\" data-end=\"6658\">\/my_lifecycle_node<\/code>, you can use:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4872011 elementor-widget elementor-widget-code-highlight\" data-id=\"4872011\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>ros2 lifecycle set \/my_lifecycle_node configure\r\nros2 lifecycle set \/my_lifecycle_node activate\r\nros2 lifecycle set \/my_lifecycle_node deactivate\r\nros2 lifecycle set \/my_lifecycle_node cleanup\r\nros2 lifecycle set \/my_lifecycle_node shutdown\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3c61bba elementor-widget elementor-widget-text-editor\" data-id=\"3c61bba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"7843\" data-end=\"7858\">Each command triggers the corresponding callback defined in the code and moves the node to its new state.<br data-start=\"7029\" data-end=\"7032\" \/>To check the node\u2019s current state, you can use:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eaba541 elementor-widget elementor-widget-code-highlight\" data-id=\"eaba541\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-tomorrow copy-to-clipboard\">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-python\">\n\t\t\t\t<code readonly=\"true\" class=\"language-python\">\n\t\t\t\t\t<xmp>ros2 lifecycle get \/my_lifecycle_node\r\n<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6e30ba6 elementor-widget elementor-widget-text-editor\" data-id=\"6e30ba6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"7843\" data-end=\"7858\">This management system makes it extremely easy to coordinate multiple nodes running simultaneously \u2014 a key advantage in distributed systems where modules must activate in the correct order or safely deactivate when required.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a76dd41 elementor-widget elementor-widget-text-editor\" data-id=\"a76dd41\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"7363\" data-end=\"7396\"><strong>\ud83e\udd14 Why Lifecycle Nodes Matter<\/strong><\/h3><p data-start=\"7398\" data-end=\"7593\">The introduction of Lifecycle Nodes makes ROS 2 far more mature and professional compared to its predecessors.<br data-start=\"7508\" data-end=\"7511\" \/>This feature enables <strong data-start=\"7532\" data-end=\"7573\">predictable and controlled management<\/strong> of node behavior.<br \/><br \/><\/p><p data-start=\"7595\" data-end=\"7930\">In real projects, this means sensors are never activated before the network is ready, actuators can be safely suspended, and resources are always released correctly \u2014 preventing memory leaks and race conditions.<br data-start=\"7806\" data-end=\"7809\" \/>A system that fully leverages Lifecycle Nodes is not only more stable and scalable but also easier to debug and maintain.<br \/><br \/><\/p><p data-start=\"7932\" data-end=\"8205\">In industrial environments, this approach has become the standard for coordinating complex robotic systems with precision and determinism.<br data-start=\"8070\" data-end=\"8073\" \/>In research and prototyping, it provides the flexibility to test and modify behaviors without compromising overall system stability.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-078e0ac elementor-widget elementor-widget-text-editor\" data-id=\"078e0ac\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"8212\" data-end=\"8228\"><strong>\ud83c\udfaf Conclusion<\/strong><\/h3><p data-start=\"8230\" data-end=\"8491\">In this article, we explored how ROS 2 Lifecycle Nodes provide a structured and reliable way to manage the life cycle of nodes.<br data-start=\"8357\" data-end=\"8360\" \/>We saw how to create a managed node in Python, attach transition callbacks, and control its state directly through the ROS 2 CLI.<br \/><br \/><\/p><p data-start=\"8493\" data-end=\"8850\">The ability to decide exactly <em data-start=\"8523\" data-end=\"8529\">when<\/em> a node activates or deactivates is one of the foundations of building professional, safe, and dependable robots.<br data-start=\"8642\" data-end=\"8645\" \/>And this is just the beginning: in complex systems, Lifecycle Nodes are integrated with automatic supervisors, error-handling mechanisms, and recovery logic that make robots more autonomous and resilient.<br \/><br \/><\/p><p data-start=\"8852\" data-end=\"9276\">If you want to learn how to design and build professional robotic systems leveraging the full power of ROS 2 Lifecycle Nodes, check out our <strong data-start=\"8995\" data-end=\"9020\">complete ROS 2 course<\/strong>.<br \/><br data-start=\"9021\" data-end=\"9024\" \/>It includes step-by-step lessons, practical examples, and ready-to-use materials that will help you apply these techniques directly in your projects.<br data-start=\"9173\" data-end=\"9176\" \/>Scroll down to discover how to access the course today and take your ROS 2 skills to the next level.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c5d20e7 e-con-full e-flex e-con e-parent\" data-id=\"c5d20e7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e8bdddd elementor-bg-transform elementor-bg-transform-move-left elementor-cta--layout-image-left elementor-cta--mobile-layout-image-above elementor-cta--skin-classic elementor-animated-content elementor-widget elementor-widget-call-to-action\" data-id=\"e8bdddd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"call-to-action.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-cta\">\n\t\t\t\t\t<div class=\"elementor-cta__bg-wrapper\">\n\t\t\t\t<div class=\"elementor-cta__bg elementor-bg\" style=\"background-image: url(https:\/\/learnbydoing.dev\/wp-content\/uploads\/2025\/06\/plan_navigation.webp);\" role=\"img\" aria-label=\"plan_navigation\"><\/div>\n\t\t\t\t<div class=\"elementor-cta__bg-overlay\"><\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-cta__content\">\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<h2 class=\"elementor-cta__title elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tWant to learn more?\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__description elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t\tIf you want to learn how to design and build professional robotic systems leveraging the full power of ROS 2 Lifecycle Nodes, check out our \"Self Driving and ROS 2 - Learn by doing! Plan &amp; Navigation\" course\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-cta__button-wrapper elementor-cta__content-item elementor-content-item\">\n\t\t\t\t\t<a class=\"elementor-cta__button elementor-button elementor-size-\" href=\"\" target=\"_blank\">\n\t\t\t\t\t\tEnroll Now\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-ribbon elementor-ribbon-right\">\n\t\t\t\t<div class=\"elementor-ribbon-inner\">\n\t\t\t\t\tDISCOUNT\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>When developing complex robotic systems, the ability to precisely control the operational state of each node is essential to ensure reliability, safety, and maintainability. ROS 2 addresses this need through a key concept: Lifecycle Nodes.Unlike regular nodes that start operating as soon as they are launched, Lifecycle Nodes allow you to manage their life cycle [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":4100,"comment_status":"closed","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[45,43],"tags":[328,347,349,179,66,74,106,319,96,110,343,348,296,71,107,72,342,76,73],"class_list":["post-4050","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ros-2","category-tutorials","tag-antonio-brandi","tag-brandi","tag-costmaps","tag-lbd","tag-learn-by-doing","tag-linux","tag-mapping","tag-maps","tag-nav2","tag-navigation","tag-obstacle","tag-pc","tag-raspberry","tag-ros","tag-ros-2","tag-ros2","tag-static","tag-step-by-step","tag-ubuntu"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Managing and Creating Lifecycle Nodes in ROS 2 - Learn by Doing!<\/title>\n<meta name=\"description\" content=\"Learn how to create and manage Lifecycle Nodes in ROS 2. 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