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Chapter 12. Troubleshooting Windows container workloads
You can troubleshoot Windows container workload issues to ensure that your Windows nodes are running correctly in your cluster.
12.1. Windows Machine Config Operator does not install 링크 복사링크가 클립보드에 복사되었습니다!
If you have completed the process of installing the Windows Machine Config Operator (WMCO), but the Operator is stuck in the InstallWaiting phase, your issue is likely caused by a networking issue.
The WMCO requires your OpenShift Container Platform cluster to be configured with hybrid networking using OVN-Kubernetes; the WMCO cannot complete the installation process without hybrid networking available. This is necessary to manage nodes on multiple operating systems (OS) and OS variants. This must be completed during the installation of your cluster.
12.2. Investigating why Windows Machine does not become compute node 링크 복사링크가 클립보드에 복사되었습니다!
There are various reasons why a Windows Machine does not become a compute node. The best way to investigate this problem is to collect the Windows Machine Config Operator (WMCO) logs.
Prerequisites
- You installed the Windows Machine Config Operator (WMCO) using Operator Lifecycle Manager (OLM).
- You have created a Windows compute machine set.
Procedure
Run the following command to collect the WMCO logs:
$ oc logs -f deployment/windows-machine-config-operator -n openshift-windows-machine-config-operator
12.3. Accessing a Windows node 링크 복사링크가 클립보드에 복사되었습니다!
Windows nodes cannot be accessed using the oc debug node command; the command requires running a privileged pod on the node, which is not yet supported for Windows. Instead, a Windows node can be accessed using a secure shell (SSH) or Remote Desktop Protocol (RDP). An SSH bastion is required for both methods.
12.3.1. Accessing a Windows node using SSH 링크 복사링크가 클립보드에 복사되었습니다!
You can access a Windows node by using a secure shell (SSH).
Prerequisites
- You have installed the Windows Machine Config Operator (WMCO) using Operator Lifecycle Manager (OLM).
- You have created a Windows compute machine set.
-
You have added the key used in the
cloud-private-keysecret and the key used when creating the cluster to the ssh-agent. For security reasons, remember to remove the keys from the ssh-agent after use. -
You have connected to the Windows node using an
ssh-bastionpod.
Procedure
Access the Windows node by running the following command:
$ ssh -t -o StrictHostKeyChecking=no -o ProxyCommand='ssh -A -o StrictHostKeyChecking=no \ -o ServerAliveInterval=30 -W %h:%p core@$(oc get service --all-namespaces -l run=ssh-bastion \ -o go-template="{{ with (index (index .items 0).status.loadBalancer.ingress 0) }}{{ or .hostname .ip }}{{end}}")' <username>@<windows_node_internal_ip>1 2 where:
<username>-
Specifies the cloud provider username, such as
Administratorfor Amazon Web Services (AWS) orcapifor Microsoft Azure. <windows_node_internal_ip>Specifies the internal IP address of the node, which can be discovered by running the following command:
$ oc get nodes <node_name> -o jsonpath={.status.addresses[?\(@.type==\"InternalIP\"\)].address}
12.3.2. Accessing a Windows node using RDP 링크 복사링크가 클립보드에 복사되었습니다!
You can access a Windows node by using a Remote Desktop Protocol (RDP).
Prerequisites
- You installed the Windows Machine Config Operator (WMCO) using Operator Lifecycle Manager (OLM).
- You have created a Windows compute machine set.
-
You have added the key used in the
cloud-private-keysecret and the key used when creating the cluster to the ssh-agent. For security reasons, remember to remove the keys from the ssh-agent after use. -
You have connected to the Windows node using an
ssh-bastionpod.
Procedure
Run the following command to set up an SSH tunnel:
$ ssh -L 2020:<windows_node_internal_ip>:3389 \1 core@$(oc get service --all-namespaces -l run=ssh-bastion -o go-template="{{ with (index (index .items 0).status.loadBalancer.ingress 0) }}{{ or .hostname .ip }}{{end}}")where:
<windows_node_internal_ip>Specifies the internal IP address of the node, which can be discovered by running the following command:
$ oc get nodes <node_name> -o jsonpath={.status.addresses[?\(@.type==\"InternalIP\"\)].address}
From within the resulting shell, SSH into the Windows node and run the following command to create a password for the user:
C:\> net user <username> *Specify the cloud provider user name, such as
Administratorfor AWS orcapifor Azure. You can now remotely access the Windows node atlocalhost:2020using an RDP client.
12.4. Collecting Kubernetes node logs for Windows containers 링크 복사링크가 클립보드에 복사되었습니다!
Windows container logging works differently from Linux container logging; the Kubernetes node logs for Windows workloads are streamed to the C:\var\logs directory by default. Therefore, you must gather the Windows node logs from that directory.
Prerequisites
- You installed the Windows Machine Config Operator (WMCO) using Operator Lifecycle Manager (OLM).
- You have created a Windows compute machine set.
Procedure
To view the logs under all directories in
C:\var\logs, run the following command:$ oc adm node-logs -l kubernetes.io/os=windows --path= \ /ip-10-0-138-252.us-east-2.compute.internal containers \ /ip-10-0-138-252.us-east-2.compute.internal hybrid-overlay \ /ip-10-0-138-252.us-east-2.compute.internal kube-proxy \ /ip-10-0-138-252.us-east-2.compute.internal kubelet \ /ip-10-0-138-252.us-east-2.compute.internal podsYou can now list files in the directories using the same command and view the individual log files. For example, to view the kubelet logs, run the following command:
$ oc adm node-logs -l kubernetes.io/os=windows --path=/kubelet/kubelet.log
12.5. Collecting Windows application event logs 링크 복사링크가 클립보드에 복사되었습니다!
The Get-WinEvent shim on the kubelet logs endpoint can be used to collect application event logs from Windows machines.
Prerequisites
- You installed the Windows Machine Config Operator (WMCO) using Operator Lifecycle Manager (OLM).
- You have created a Windows compute machine set.
Procedure
To view logs from all applications logging to the event logs on the Windows machine, run:
$ oc adm node-logs -l kubernetes.io/os=windows --path=journalThe same command is executed when collecting logs with
oc adm must-gather.Other Windows application logs from the event log can also be collected by specifying the respective service with a
-uflag. For example, you can run the following command to collect logs for the containerd container runtime service:$ oc adm node-logs -l kubernetes.io/os=windows --path=journal -u containerd
12.6. Collecting containerd logs for Windows containers 링크 복사링크가 클립보드에 복사되었습니다!
The Windows containerd container service does not stream log data to stdout, but instead, it stream log data to the Windows event log. You can view the containerd event logs to investigate issues you think might be caused by the Windows containerd container service.
Prerequisites
- You installed the Windows Machine Config Operator (WMCO) using Operator Lifecycle Manager (OLM).
- You have created a Windows compute machine set.
Procedure
View the containerd logs by running the following command:
$ oc adm node-logs -l kubernetes.io/os=windows --path=containerd