Skip to main content

7 posts tagged with "k8s"

View All Tags

ernel:unregister_netdevice: waiting for eth0 to become free. Usage count = 1

· One min read

: https://access.redhat.com/solutions/3659011

SOLUTION VERIFIED - Updated October 13 2019 at 9:17 PM -

English

Issue​

  • We are trying to prototype kubernetes on top of RHEL and encounter the situation that the device seems to be frozen. There are repeated messages similar to:

Raw

[1331228.795391] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
[1331238.871337] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
[1331248.919329] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
[1331258.964322] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
  • This problem occurs when scaling down pods in kubernetes. A reboot of the node is required to rectify.
  • This has been seen after customers upgraded to a kernel with the fix for https://access.redhat.com/solutions/3105941 But after that the messages appear on ethX instead of lo.

Environment​

  • Red Hat Enterprise Linux 7

    • kernel-3.10.0-862.el7.x86_64
    • kernel-3.10.0-957.el7.x86_64

  • upstream Kubernetes

  • upstream docker

refer:

https://github.com/kubernetes/kubernetes/issues/70427

[Kubernetes] Create deployment, service by Python client

· 2 min read

Install Kubernetes Python Client and PyYaml:

# pip install kubernetes pyyaml

1. Get Namespaces or Pods by CoreV1Api:

# -*- coding: utf-8 -*-
from kubernetes import client, config, utils

config.kube_config.load_kube_config(config_file="../kubecfg.yaml")
coreV1Api = client.CoreV1Api()

print("\nListing all namespaces")
for ns in coreV1Api.list_namespace().items:
    print(ns.metadata.name)

print("\nListing pods with their IP, namespace, names:")
for pod in coreV1Api.list_pod_for_all_namespaces(watch=False).items:
    print("%s\t\t%s\t%s" % (pod.status.pod_ip, pod.metadata.namespace, pod.metadata.name))

2. Create Deployment and Service by AppsV1Api:

# -*- coding: utf-8 -*-
from kubernetes import client, config, utils
import yaml

config.kube_config.load_kube_config(config_file="../kubecfg.yaml")
yamlDeploy = open( r'deploy.yaml')
jsonDeploy = yaml.load(yamlDeploy, Loader = yaml.FullLoader)

yamlService = open(r'service.yaml')
jsonService = yaml.load(yamlService, Loader = yaml.FullLoader)

appsV1Api = client.AppsV1Api()

if jsonDeploy['kind'] == 'Deployment':
    appsV1Api.create_namespaced_deployment(
        namespace="default", body = jsonDeploy
    )

if jsonService['kind'] == 'Service':
    coreV1Api.create_namespaced_service(
        namespace="default",
        body=jsonService
    )

3. Create ANY type of objects from a yaml file by utils.create_from_yaml, you can put multiple resources in one yaml file:

# -*- coding: utf-8 -*-
from kubernetes import client, config, utils

config.kube_config.load_kube_config(config_file="../kubecfg.yaml")

k8sClient = client.ApiClient()
utils.create_from_yaml(k8sClient, "deploy-service.yaml")

Reference: https://github.com/kubernetes-client/python/blob/6709b753b4ad2e09aa472b6452bbad9f96e264e3/examples/create_deployment_from_yaml.py https://stackoverflow.com/questions/56673919/kubernetes-python-api-client-execute-full-yaml-file

ClustrMaps