During "upgrade node" and "upgrade apply" read the
kubelet env file from /var/lib/kubelet/kubeadm-flags.env
patch the --container-runtime-endpoint flag value to
have the appropriate URL scheme prefix (e.g. unix:// on Linux)
and write the file back to disk.
This is a temporary workaround that should be kept only for 1 release
cycle - i.e. remove this in 1.25.
The CRI socket that kubeadm writes as an annotation
on a particular Node object can include an endpoint that
does not have an URL scheme. This is undesired as long term
the kubelet can stop allowing endpoints without URL scheme.
For control plane nodes "kubeadm upgrade apply" takes
the locally defaulted / populated NodeRegistration and refreshes
the CRI socket in PerformPostUpgradeTasks. But for secondary
nodes "kubeadm upgrade node" does not.
Adapt "upgrade node" to fetch the NodeRegistration for this node
and fix the CRI socket missing URL scheme if needed in the Node
annotation.
- Update defaults for v1beta2 and 3 to have URL scheme
- Raname DefaultUrlScheme to DefaultContainerRuntimeURLScheme
- Prepend a missing URL scheme to user sockets and warn them
that this might not be supported in the future
- Update socket validation to exclude IsAbs() testing
(This is broken on Windows). Assume the path is not empty and has
URL scheme at this point (validation happens after defaulting).
- Use net.Dial to open Unix sockets
- Update all related unit tests
Signed-off-by: pacoxu <paco.xu@daocloud.io>
Signed-off-by: Lubomir I. Ivanov <lubomirivanov@vmware.com>
Currently when the dockershim socket is used, kubeadm only passes
the --network-plugin=cni to the kubelet and assumes the built-in
dockershim. This is valid for versions <1.24, but with dockershim
and related flags removed the kubelet will fail.
Use preflight.GetKubeletVersion() to find the version of the host
kubelet and if the version is <1.24 assume that it has built-in
dockershim. Newer versions should will be treated as "remote" even
if the socket is for dockershim, for example, provided by cri-dockerd.
Update related unit tests.
Since we removed dockershim we now rely on both flags, which therefore
should not marked experimental any more.
Signed-off-by: Sascha Grunert <sgrunert@redhat.com>
Apply a small fix to ensure the kubeconfig files
that kubeadm manages have a CA when printed in the table
of the "check expiration" command. "CAName" is the field used for that.
In practice kubeconfig files can contain multiple credentials
from different CAs, but this is not supported by kubeadm and there
is a single cluster CA that signs the single client cert/key
in kubeadm managed kubeconfigs.
In case stacked etcd is used, the code that does expiration checks
does not validate if the etcd CA is "external" (missing key)
and if the etcd CA signed certificates are valid.
Add a new function UsingExternalEtcdCA() similar to existing functions
for the cluster CA and front-proxy CA, that performs the checks for
missing etcd CA key and certificate validity.
This function only runs for stacked etcd, since if etcd is external
kubeadm does not track any certs signed by that etcd CA.
This fixes a bug where the etcd CA will be reported as local even
if the etcd/ca.key is missing during "certs check-expiration".
