"kubernetes pod 状态总是“待定”"

Question

I am following the Fedora getting started guide ( https:\/\/github.com\/GoogleCloudPlatform\/kubernetes\/blob\/master\/docs\/getting-started-guides\/fedora\/fedora_ansible_config.md<\/a> ) and trying to run the pod fedoraapache<\/code> . But kubectl<\/code> always shows fedoraapache<\/code> as pending:

POD                 IP                  CONTAINER(S)        IMAGE(S)            HOST                              LABELS              STATUS
fedoraapache                            fedoraapache        fedora/apache       192.168.226.144/192.168.226.144   name=fedoraapache   Pending

Answer 1

There are several reasons container can fail to start:

• the container command itself fails and exits -> check your docker image and start up script to make sure it works. Use sudo docker ps -a to find the offending container and sudo docker logs <container> to check for failure inside the container

• a dependency is not there: that happens for example when one tries to mount a volume that is not present, for example Secrets that are not created yet. --> make sure the dependent volumes are created.

Answer 2

Kubelet is unable to start the container we use for holding the network namespace. Some things to try are:

Can you manually pull and run gcr.io/google_containers/pause:0.8.0? (This is the image used for the network namespace container at head right now.)

As mentioned already, /var/log/kubelet.log should have more detail; but log location is distro-dependent, so check https://github.com/GoogleCloudPlatform/kubernetes/wiki/Debugging-FAQ#checking-logs .

Answer 3

Check if is Kubelet is running on your machine. I came across this problem one time and discovered that Kubelet was not running, which explains why the pod status was stuck in "pending". Kubelet runs as a systemd service in my environment, so if that is also the case for you then the following command will help you check its status:

systemctl status kubelet

Answer 4

Step one is to describe the pod and see the problems:

 $ kubectl describe pod <pod Name>