Get kubelet logs from Azure Kubernetes Service (AKS) cluster nodes
As part of operating an AKS cluster, you may need to review logs to troubleshoot a problem. Built-in to the Azure portal is the ability to view logs for the AKS master components or containers in an AKS cluster. Occasionally, you may need to get kubelet logs from an AKS node for troubleshooting purposes.
This article shows you how you can use journalctl
to view the kubelet logs on an AKS node.
Before you begin
This article assumes that you have an existing AKS cluster. If you need an AKS cluster, see the AKS quickstart using the Azure CLI, using Azure PowerShell, or using the Azure portal.
Create an SSH connection
First, create an SSH connection with the node on which you need to view kubelet logs. This operation is detailed in the SSH into Azure Kubernetes Service (AKS) cluster nodes document.
Get kubelet logs
Once you have connected to the node via kubectl debug
, run the following command to pull the kubelet logs:
chroot /host
journalctl -u kubelet -o cat
Note
You don't need to use sudo journalctl
since you are already root
on the node.
Note
For Windows nodes, the log data is in C:\k
and can be viewed using the more command:
more C:\k\kubelet.log
The following sample output shows the kubelet log data:
I0508 12:26:17.905042 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:26:27.943494 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:26:28.920125 8672 server.go:796] GET /stats/summary: (10.370874ms) 200 [[Ruby] 10.244.0.2:52292]
I0508 12:26:37.964650 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:26:47.996449 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:26:58.019746 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:27:05.107680 8672 server.go:796] GET /stats/summary/: (24.853838ms) 200 [[Go-http-client/1.1] 10.244.0.3:44660]
I0508 12:27:08.041736 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:27:18.068505 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:27:28.094889 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:27:38.121346 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:27:44.015205 8672 server.go:796] GET /stats/summary: (30.236824ms) 200 [[Ruby] 10.244.0.2:52588]
I0508 12:27:48.145640 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:27:58.178534 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:28:05.040375 8672 server.go:796] GET /stats/summary/: (27.78503ms) 200 [[Go-http-client/1.1] 10.244.0.3:44660]
I0508 12:28:08.214158 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:28:18.242160 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:28:28.274408 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:28:38.296074 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:28:48.321952 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
I0508 12:28:58.344656 8672 kubelet_node_status.go:497] Using Node Hostname from cloudprovider: "aks-agentpool-11482510-0"
Next steps
If you need additional troubleshooting information from the Kubernetes master, see view Kubernetes master node logs in AKS.
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