remove_node_taint

Remove taints from Kubernetes nodes to allow pod scheduling by specifying context, node name, and taint key for cluster management.

Instructions

Remove a taint from a node.

Args: context_name: The Kubernetes context name node_name: The name of the node to modify taint_key: The taint key to remove

Returns: JSON string containing the updated node taints

Input Schema

TableJSON Schema

Name	Required	Description	Default
`context_name`	Yes
`node_name`	Yes
`taint_key`	Yes

Implementation Reference

tools/node.py:280-352 (handler)

The remove_node_taint tool handler function. It removes a specified taint from a Kubernetes node by patching the node's spec taints list after filtering out the matching taint key. Includes decorators for MCP tool registration (@mcp.tool()) and context usage (@use_current_context). Returns JSON with updated taints or messages if not found/no taints.

@mcp.tool()
@use_current_context
def remove_node_taint(context_name: str, node_name: str, taint_key: str):
    """
    Remove a taint from a node.

    Args:
        context_name: The Kubernetes context name
        node_name: The name of the node to modify
        taint_key: The taint key to remove

    Returns:
        JSON string containing the updated node taints
    """
    core_v1: CoreV1Api = get_api_clients(context_name)["core"]

    # Get the current node
    node = core_v1.read_node(node_name)

    # Check if the node has taints
    if not node.spec.taints:
        result = {
            "name": node_name,
            "taints": [],
            "message": "Node has no taints"
        }
        return json.dumps(result)

    # Filter out the taint to remove
    updated_taints = [taint for taint in node.spec.taints if taint.key != taint_key]

    # Check if taint was found
    if len(updated_taints) == len(node.spec.taints):
        result = {
            "name": node_name,
            "taints": [{"key": taint.key, "value": taint.value, "effect": taint.effect}
                       for taint in node.spec.taints],
            "message": f"Taint with key '{taint_key}' not found"
        }
        return json.dumps(result)

    # Apply the patch
    body = {
        "spec": {
            "taints": [
                {
                    "key": taint.key,
                    "value": taint.value,
                    "effect": taint.effect
                } for taint in updated_taints
            ]
        }
    }

    patched_node = core_v1.patch_node(node_name, body)

    # Format the taints for response
    response_taints = []
    if patched_node.spec.taints:
        response_taints = [
            {
                "key": taint.key,
                "value": taint.value,
                "effect": taint.effect
            } for taint in patched_node.spec.taints
        ]

    result = {
        "name": patched_node.metadata.name,
        "taints": response_taints
    }

    return json.dumps(result)

k8s-pilot