master node not available after rebooting EC2

I stopped EC2 vms and after restarting master node is not available
- ubuntu@ip-xxx-xxx-xx-xxx:~$ systemctl status kubelet
- ● kubelet.service - kubelet: The Kubernetes Node Agent
- Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
- Drop-In: /etc/systemd/system/kubelet.service.d
- └─10-kubeadm.conf
- Active: active (running) since Tue 2019-01-08 19:12:13 UTC; 9min ago
- Docs: https://kubernetes.io/docs/home/
- Main PID: 1288 (kubelet)
- Tasks: 21
- Memory: 95.0M
- CPU: 1min 7.658s
- CGroup: /system.slice/kubelet.service
- ├─1288 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --config=/var/lib/kubelet/config.yaml --cgroup-driver=cgroupfs --network-plugin=cni
- └─4535 /opt/cni/bin/calico
- Jan 08 19:22:03 ip-xxx-xxx-xx-xxx kubelet[1288]: E0108 19:22:03.267101 1288 kubelet.go:2236] node "ip-xxx-xxx-xx-xxx" not found
- Jan 08 19:22:03 ip-xxx-xxx-xx-xxx kubelet[1288]: E0108 19:22:03.432768 1288 kubelet.go:2236] node "ip-xxx-xxx-xx-xxx" not found
- Jan 08 19:22:03 ip-xxx-xxx-xx-xxx kubelet[1288]: E0108 19:22:03.597614 1288 kubelet.go:2236] node "ip-xxx-xxx-xx-xxx" not found
- Jan 08 19:22:04 ip-xxx-xxx-xx-xxx kubelet[1288]: 2019-01-08 19:22:04.089 [INFO][4535] calico.go 341: Extracted identifiers ContainerID="2af3731145389d511fb6c156e6fbcf5adb586d7290aa32f7d523ea80dceeb45b" Node="ip-xxx-xxx-xx-xxx" Orchestr
- Jan 08 19:22:04 ip-xxx-xxx-xx-xxx kubelet[1288]: 2019-01-08 19:22:04.089 [INFO][4535] client.go 202: Loading config from environment
- Jan 08 19:22:04 ip-xxx-xxx-xx-xxx kubelet[1288]: E0108 19:22:04.169439 1288 kubelet.go:2236] node "ip-xxx-xxx-xx-xxx" not found
- Jan 08 19:22:04 ip-xxx-xxx-xx-xxx kubelet[1288]: E0108 19:22:04.334586 1288 azure_dd.go:147] failed to get azure cloud in GetVolumeLimits, plugin.host: ip-xxx-xxx-xx-xxx
- Jan 08 19:22:04 ip-xxx-xxx-xx-xxx kubelet[1288]: E0108 19:22:04.824445 1288 kubelet.go:2236] node "ip-xxx-xxx-xx-xxx" not found
- Jan 08 19:22:04 ip-xxx-xxx-xx-xxx kubelet[1288]: E0108 19:22:04.945939 1288 kubelet.go:2236] node "ip-xxx-xxx-xx-xxx" not found
- Jan 08 19:22:05 ip-xxx-xxx-xx-xxx kubelet[1288]: E0108 19:22:05.071637 1288 kubelet.go:2236] node "ip-xxx-xxx-xx-xxx" not found
I assume it should be possible to reboot/stop&restart VMs.
Comments
-
Hi @crixo ,
It has been a while since I worked on AWS, but I remember being able to stop instances and then start them back up when I was ready to continue with my labs.
-Chris0 -
@crixo
I went thru lab 2.1 on 2 EC2 instances on AWS, and I had no trouble completing the lab, stopping then starting my instances. Aside from being assigned new public IPs, the node IPs remained the same, but the pod IPs have changed. I was also able to retest the service by accessing the nginx webserver via curl and browser.
Can you provide any other details?
Can you look into the bootstrap-config, kubelet-config or config files to see whether the master IP has changed?
Thanks,
-Chris0 -
Hi @chrispokorni,
I destroyed previous VM and after creating a new one I was able to reboot and continue to work w/ the cluster.
I noticed VM went wild due to kswapd0 was using most of the cpu.
Since the suggestion in the lab setup script to execute "sudo swapoff -a", I added into the aws VM the same command into
/etc/rc.local to execute it after each reboot0 -
AWS instances typically have swap disabled by default, the ones I've looked at and used at least. Perhaps something else? Did any of the containers restart? If there is a lot of activity and not enough resources - like when only one node is ready in a cluster - that the terminations of running containers because of OOM issues causes a stamped. After rebooting, the worker node is ready for the workload sharing and things work better.
Glad its working now.
Regards,
0 -
Hi @crixo,
You can verify swap by running one of the following:cat /etc/fstab
cat /proc/swaps
swapon -s
free -h
There seems to be a known issue with kswapd0 using a lot of CPU and there are a few solutions posted online, but I have not tried either of them so I am not sure what works and what doesn't.
Regards,
-Chris0
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