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# k3s
a
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a
When the embedded registry mirror is enabled, all nodes must be able to reach each other via their internal IP addresses, on TCP ports 5001 and 6443.
c
This is Spegel. Read the Spegel docs and code.
It is linked from our docs
a
I couldn't find matter related to the above mentioned ports. Would you be able to brief on why each port is necessary for registry mirror to function?
c
> K3s embeds Spegel, a stateless distributed OCI registry mirror that allows peer-to-peer sharing of container images between nodes in a Kubernetes cluster.
Click the Spegel link
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