MKE 3.5.5 known issues with available workaround solutions include:
[MKE-8914] Windows Server Core with Containers images incompatible with GCP
[MKE-8814] Mismatched MTU values cause Swarm overlay network issues on GCP
ucp-kube-proxy container can mistakenly present as unhealthy in eBPF mode
[MKE-9110] IPVS mode is inoperable on kernel version 5.11 or later
[FIELD-5081] Node Feature Discovery Pods cause crash loop¶
Use of Node Feature Discovery (NFD) Pods can result in a crash loop in Linux systems that run MCR 20.10.8 and earlier (moby/moby#42836).
Update MCR to version 20.10.9 or later.
[MKE-8914] Windows Server Core with Containers images incompatible with GCP¶
As Windows Server Core with Containers images are not compatible with GCP,
their use will prevent
kubelet from starting up.
Use Windows Server or Windows Server Core images.
[MKE-8814] Mismatched MTU values cause Swarm overlay network issues on GCP¶
The default MTU value for GCP VPCs is 1460 and the default MTU value for Docker networks is 1500. When left unchanged, components that use Swarm overlay networks fail to communicate with each other.
To workaround the issue, select from the following options:
Create a new VPC and set the MTU value to 1500.
Set the MTU value of the existing VPC to 1500.
For more information, refer to the Google Cloud Platform documentation, Change the MTU setting of a VPC network.
ucp-kube-proxy container can mistakenly present as unhealthy in eBPF mode¶
When running Calico in eBPF mode with
kube-proxy disabled, the
ucp-kube-proxy container can erroneously display an unhealthy status,
which you can safely ignore. The specific settings in the MKE configuration
file that can produce this result are as follows:
calico_ebpf_enabled = true kube_proxy_mode = "disabled"
For more information about these settings, refer to Cluster and service networking options and Configure cluster and service networking in an existing cluster.
[MKE-9110] IPVS mode is inoperable on kernel version 5.11 or later¶
Kube-proxy in IPVS mode is inoperable when running MKE on kernel version 5.11 or later. A workaround solution is available upon request.