Question on Lab 3.2 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
-
Hello,
Please paste the output of kubectl get nodes, to ensure that both nodes have joined the cluster and are in good shape. As well, ensure that you have removed the taint on the master so that it is able to run non-internal pods?
As far as AWS, If you log into your console.aws.amazon.com page, navigate to Compute -> EC2 -> Instances -> Instances page you will see the running instances. Select the ones you want to work with then using the drop-down "Action" menu above you can perform actions to stop or terminate the instances. This tutorials covers the basic workflow/lifecycle of an instance: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EC2_GetStarted.html
Regards,
0 -
Hi,
In case you missed this earlier, I attempted the Labs from Chapter 3 on 2 EC2 instances on AWS and I did not run into any issues. In addition to possible join issue, or taints, as mentioned by @serewicz, I also researched the issue you have described, and I found several discussions on similar error/warning messages, and most of them suggest 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
Aside from providing the outputs requested by @serewicz, can you also provide some details about your EC2 setup in AWS? It may also help in identifying the source of your issues.
Good luck!
-Chris
0
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