Lab3.2 Step 10
Hi, all,
I was trying the lab on AWS cloud. I successfully started a master and a node, and the node has successfully joined the cluster. However, when I start the deployment, there is no available nginx in the deployment.
=========== output ============
ubuntu@ip-10-0-0-69:~$ kubectl get deployments
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 1 1 1 0 23m
=========== output ============
The event is as follows, which shows the pod sandbox fails.
=========== output ============
26m 26m 1 nginx-8586cf59-ppkph.1526b633df971998 Pod Normal Scheduled default-scheduler Successfully assigned nginx-8586cf59-ppkph to ip-10-0-0-5
26m 26m 1 nginx-8586cf59-ppkph.1526b633f408be87 Pod Normal SuccessfulMountVolume kubelet, ip-10-0-0-5 MountVolume.SetUp succeeded for volume "default-token-m995p"
26m 26m 12 nginx-8586cf59-ppkph.1526b6340363db54 Pod Warning FailedCreatePodSandBox kubelet, ip-10-0-0-5 Failed create pod sandbox.
26m 26m 12 nginx-8586cf59-ppkph.1526b6343c62c19d Pod Normal SandboxChanged kubelet, ip-10-0-0-5 Pod sandbox changed, it will be killed and re-created.
12m 12m 1 nginx-8586cf59-ppkph.1526b6f60dca5608 Pod Normal SuccessfulMountVolume kubelet, ip-10-0-0-5 MountVolume.SetUp succeeded for volume "default-token-m995p"
7m 12m 298 nginx-8586cf59-ppkph.1526b6f636c470e4 Pod Warning FailedCreatePodSandBox kubelet, ip-10-0-0-5 Failed create pod sandbox.
2m 12m 584 nginx-8586cf59-ppkph.1526b6f6548f8d19 Pod Normal SandboxChanged kubelet, ip-10-0-0-5 Pod sandbox changed, it will be killed and re-created.
26m 26m 1 nginx-8586cf59.1526b633ded64e2d ReplicaSet Normal SuccessfulCreate replicaset-controller Created pod: nginx-8586cf59-ppkph
26m 26m 1 nginx.1526b633dd5d3b91 Deployment Normal ScalingReplicaSet deployment-controller Scaled up replica set nginx-8586cf59 to 1
=========== output ============
Does anyone have any idea about what went wrong in this?
Also, does anyone have any idea about the steps to turn down the EC2 instance when I finish practicing, and then turn on the instances to resume practicing? Thanks.
Comments
-
Hi,
I just attempted the Labs from Chapter 3 on 2 EC2 instances on AWS and I did not run into any issues. I also researched the issue you have described, and it may be networking related. It may have to do with the pod network used (Flannel, Calico) and/or the networking/firewall rules (security group, VPC, network ACL) configured for the EC2 instances.I setup my 2 EC2's as Ubuntu VMs on t2.micro, with public IPs, inside a default security group where I opened all inbound TCP traffic (clearly not best practice, but for the purpose of these exercises it works).
Here is a list of ports used by Kubernetes which need to be open on each node:
https://kubernetes.io/docs/setup/independent/install-kubeadm/#check-required-ports
Can you provide some details about your setup? It may help in identifying the source of your issues.
Stopping the EC2 instances:
EC2 Dashboard > Instances > select the checkboxes of your instances > Action > Instance State > StopStarting instances: follow the same path, then > Start
Good luck!
-Chris
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