def get_nodes_memory(self):
"""Get list of all node memory capacities."""
try:
nodes = current_k8s_corev1_api_client.list_node()
return [
kubernetes_memory_to_bytes(node.status.capacity["memory"])
for node in nodes.items
]
except ValueError as e:
# FIXME: after new Kubernetes release this should be not needed
msg = "Error while retreiving k8s list of nodes."
logging.error(msg)
logging.error(e)
return []
def check_predefined_conditions():
"""Check k8s predefined conditions for the nodes."""
try:
node_info = current_k8s_corev1_api_client.list_node()
for node in node_info.items:
# check based on the predefined conditions about the
# node status: MemoryPressure, OutOfDisk, KubeletReady
# DiskPressure, PIDPressure,
for condition in node.status.conditions:
if not condition.status:
return False
except ApiException as e:
log.error('Something went wrong while getting node information.')
log.error(e)
return False
return True
def check_predefined_conditions():
"""Check Kubernetes predefined conditions for the nodes."""
try:
node_info = json.loads(
current_k8s_corev1_api_client.list_node(
_preload_content=False).data.decode())
for node in node_info["items"]:
# check based on the predefined conditions about the
# node status: MemoryPressure, OutOfDisk, KubeletReady
# DiskPressure, PIDPressure,
for condition in node.get("status", {}).get("conditions", {}):
if not condition.get("status"):
return False
except ApiException as e:
logging.error("Something went wrong while getting node information.")
logging.error(e)
return False
return True
def get_memory_usage(self):
"""Get nodes memory usage."""
result = dict()
try:
nodes = current_k8s_corev1_api_client.list_node()
for node in nodes.items:
result[node.metadata.name] = {
"capacity": node.status.capacity["memory"]
}
node_metrics = current_k8s_custom_objects_api_client.list_cluster_custom_object(
"metrics.k8s.io", "v1beta1", "nodes"
)
for node_metric in node_metrics.get("items", []):
node_name = node_metric["metadata"]["name"]
result[node_name]["usage"] = node_metric["usage"]["memory"]
node_capacity = result[node_name]["capacity"]
node_usage = result[node_name]["usage"]
node_usage_percentage = ClusterHealth.get_percentage(
kubernetes_memory_to_bytes(node_usage),
kubernetes_memory_to_bytes(node_capacity),
)
result[node_name]["percentage"] = f"{node_usage_percentage}%"
result[node_name]["available"] = node_capacity - node_usage
except ApiException as e:
msg = "Error while calling `metrics.k8s.io` API."
logging.error(msg)
logging.error(e)
return {"error": msg}
except ValueError as e:
# FIXME: after new Kubernetes release this should be not needed
msg = "Error while retreiving k8s list of nodes."
logging.error(msg)
logging.error(e)
return {"error": msg}
return result
def get_unschedulable_nodes(self):
"""Get list of node names that are not schedulable."""
nodes = current_k8s_corev1_api_client.list_node(
field_selector="spec.unschedulable=true"
)
return [node.metadata.name for node in nodes.items]
def get_nodes(self):
"""Get list of all node names."""
nodes = current_k8s_corev1_api_client.list_node()
return [node.metadata.name for node in nodes.items]
