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Check if the node went down

There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

For nodes that are in a non-ready state, checks which of them went down by checking for their Node IPs

cmd = "aws ec2 describe-instances" cmd += " --filters Name=instance-state-name,Values=running" cmd += " --query 'Reservations[*].Instances[*].[InstanceId,InstanceType,PublicIpAddress,PrivateIpAddress,Tags[?Key==`Name`].Value | [0]]'" cmd += " --output text" op = _exe(None, cmd) #print(op) lines = op.split() context.skip_sub_tasks = True down_nodes = [] new_problem_nodes = [] for node in problem_nodes: if node['nodeip'] not in op: context.log("WARNING", "nodeip missing") context.skip_sub_tasks = False down_nodes.append(node) else: for line in lines: if node['nodeip'] in line: instance_id = line.split()[0] node['instance_id'] = instance_id new_problem_nodes.append(node) print(down_nodes) print(new_problem_nodes) problem_nodes = new_problem_nodes if len(problem_nodes) > 0: context.skip_sub_tasks = False
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Kubernetesnodecluster

  1. 1

    kubelet issue

    There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

    Runs checks to see node readyness issues are due to the Kubelet. Some kubelet issues include unresponsive kubelets, dead kubelets or kubelets that have exited soon.

    kubeletKubernetes
    1

    1. 1.1

      Kubelet stopped posting node status

      There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

      Returns nodes where kubelet had stopped posting status updates.

      context.skip_sub_tasks = True no_status_nodes = [] for node in problem_nodes: nodename = node['nodename'] cmd = f"kubectl describe node {nodename}" op = _exe(master_ip, cmd) if "kubelet stopped posting node status" in op.lower(): context.skip_sub_tasks = False no_status_nodes.append(node) print(no_status_nodes)
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      1.1

      1. 1.1.1

        Kubelet Dead

        There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

        Identifies nodes where the Kubelet is in an inactive or dead state.

        dead_kubelet_nodes = [] for node in no_status_nodes: instance_id = node['instance_id'] cmd = "sudo systemctl status kubelet | grep 'Active:'" op = _exe(instance_id, cmd) if "inactive (dead)" in op: dead_kubelet_nodes.append(node) context.skip_sub_tasks = len(dead_kubelet_nodes) == 0 print(dead_kubelet_nodes)
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        kubeletKubernetes
        1.1.1

      2. 1.1.2

        Kubelet exited

        There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

        Identifies kubelets that are in active but exited state.

        exited_kubelet_nodes = [] for node in no_status_nodes: instance_id = node['instance_id'] cmd = "sudo systemctl status kubelet | grep 'Active:'" op = _exe(instance_id, cmd) if "active (exited)" in op: exited_kubelet_nodes.append(node) context.skip_sub_tasks = len(exited_kubelet_nodes) == 0 print(exited_kubelet_nodes)
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        kubeletKubernetes
        1.1.2

      3. 1.1.3

        Worker kubelet unable to update master

        There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

        Gets the master instance IP addresses in the cluster and uses it to perform connectivity checks.

        for node in no_status_nodes: nodeip = node['nodeip'] cmd = "sudo systemctl status kubelet" op = _exe(nodeip, cmd) #_problem = False if "Unable to register node with API server" in op: pass master_ip_addr = _get_ip_addr(master_ip) cmd1 = f'aws ec2 describe-instances --filters "Name=ip-address,Values={master_ip_addr}" --query "Reservations[*].Instances[*].InstanceId" --output text' master_instance_ids = [_exe(None, cmd1).strip()] print(master_instance_ids)
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        Kuberneteskubelet
        1.1.3

        1. 1.1.3.1

          Security group blocked the API request

          There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

          Looks at the security groups of the master instances (by their IDs) to check if there are possible port configuration mismatches preventing connectivity.

          import json for instance_id in master_instance_ids: _problem = True cmd = f"aws ec2 describe-instances --instance-ids {instance_id} --query 'Reservations[*].Instances[*].SecurityGroups[*].GroupId' --output=text" sg_ids1 = _exe(None, cmd) print(sg_ids1) sg_ids = re.split('\s',sg_ids1.strip()) if sg_ids: for sg_id in sg_ids: if not sg_id: continue cmd1 = 'aws ec2 describe-security-groups --filter Name=group-id,Values=' cmd1+= sg_id cmd1+= ' --query SecurityGroups[*].IpPermissions[*]' op = _exe(None, cmd1) json_op = json.loads(op) for sg in json_op: for rule in sg: if 'FromPort' in rule: port_lo = int(rule['FromPort']) port_hi = port_lo if 'ToPort' in rule: port_hi = int(rule['ToPort']) if port >= port_lo and port <= port_hi: _problem = False else: continue if _problem: break if _problem: context.log("ERROR", "Found problem")
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          AWS
          1.1.3.1

  2. 2

    Kube-proxy issue

    There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.
    kube-proxyKubernetes
    2

    1. 2.1

      kube-proxy not running

      There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.
      cmd = f"kubectl get pods -n kube-system -o wide | grep kube-proxy | grep Running" op = _exe(master_ip, cmd) kube_proxy_down_nodes = [] for node in problem_nodes: nodeip = node['nodeip'] if nodeip not in op: context.log("ERROR", "Found problem node. nodeip missing") kube_proxy_down_nodes.append(node) print("Down Nodes: ", kube_proxy_down_nodes)
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      Kubernetes
      2.1

  3. 3

    System resources issues

    There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

    Checks for various resource issues in the problem nodes.

    Kubernetes
    3

    1. 3.1

      MemoryPressure

      There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

      Checks if any of the nodes are constrained on memory (experiencing MemoryPressure)

      mem_pressure_nodes = [] for node in problem_nodes: nodename = node['nodename'] cmd = f"kubectl describe node {nodename} | grep MemoryPressure" op = _exe(master_ip, cmd) mem_pressure = op.split()[1] if mem_pressure.lower() == "true": mem_pressure_nodes.append(node) if mem_pressure_nodes: context.log("ERROR", "Mem Pressure Reached") print("Mem Pressure Nodes: ", mem_pressure_nodes)
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      Kubernetes
      3.1

    2. 3.2

      DiskPressure

      There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

      Checks if any of the nodes are constrained on disk space (experiencing DiskPressure)

      disk_pressure_nodes = [] for node in problem_nodes: nodename = node['nodename'] cmd = f"kubectl describe node {nodename} | grep DiskPressure" op = _exe(master_ip, cmd) disk_pressure = op.split()[1] if disk_pressure.lower() == "true": disk_pressure_nodes.append(node) if disk_pressure_nodes: context.log("ERROR", "Disk Pressure Reached") print("Disk Pressure Nodes: ", disk_pressure_nodes)
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      Kubernetes
      3.2

    3. 3.3

      PIDPressure

      There was a problem that the LLM was not able to address. Please rephrase your prompt and try again.

      Checks if any of the nodes are constrained on number of processes (experiencing PIDPressure)

      pid_pressure_nodes = [] for node in problem_nodes: nodename = node['nodename'] cmd = f"kubectl describe node {nodename} | grep PIDPressure" op = _exe(master_ip, cmd) pid_pressure = op.split()[1] if pid_pressure.lower() == "true": pid_pressure_nodes.append(node) if pid_pressure_nodes: context.log("ERROR", "PID Pressure Reached") print("PID Pressure Nodes: ", pid_pressure_nodes)
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      Kubernetes
      3.3

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