Problem:
Only the client CA is passed to the kube-controller-manager and
therefore CSRs with the signer name "kubernetes.io/kubelet-serving" are
signed with the client CA. Serving certificates must be signed with the
server CA otherwise e.g. "kubectl logs" fails with the error message
"x509: certificate signed by unknown authority".
Solution:
Instead of providing only one CA via the kube-controller-manager
parameter "--cluster-signing-cert-file", the corresponding CA for every
signer is set with the parameters
"--cluster-signing-kube-apiserver-client-cert-file",
"--cluster-signing-kubelet-client-cert-file",
"--cluster-signing-kubelet-serving-cert-file", and
"--cluster-signing-legacy-unknown-cert-file".
Signed-off-by: Siegfried Weber <mail@siegfriedweber.net>
The kube-apiserver cert should have the same SANs in the same order,
excluding the extra user-configured SANs since this will only be used
in-cluster.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
* Update Kubernetes to v1.21.0
* Update to golang v1.16.2
* Update dependent modules to track with upstream
* Switch to upstream flannel
* Track changes to upstream cloud-controller-manager and FeatureGates
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
* Add functionality for etcd snapshot/restore to and from S3 compatible backends.
* Update etcd restore functionality to extract and write certificates and configs from snapshot.
We're not setting ``--service-account-issuer` to a https URL, which causes an
error message at startup when the feature gate is enabled. From the
docs on that flag:
> If this option is not a valid URI per the OpenID Discovery 1.0 spec, the
> ServiceAccountIssuerDiscovery feature will remain disabled, even if the
> feature gate is set to true. It is highly recommended that this value
> comply with the OpenID spec:
> https://openid.net/specs/openid-connect-discovery-1_0.html. In practice,
> this means that service-account-issuer must be an https URL. It is also
> highly recommended that this URL be capable of serving OpenID discovery
> documents at {service-account-issuer}/.well-known/openid-configuration.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
As per documentation, the cloud-provider flag should not be passed to
controller-manager when using cloud-controller. However, the legacy
cloud-related controllers still need to be explicitly disabled to
prevent errors from being logged.
Fixing this also prevents controller-manager from creating the
cloud-controller-manager service account that needed extra RBAC.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
Resolves warning 2 from #2471.
As per https://github.com/kubernetes/cloud-provider/issues/12 the
ClusterID requirement was never really followed through on, so the
flag is probably going to be removed in the future.
One side-effect of this is that the core k8s cloud-controller-manager
also wants to watch nodes, and needs RBAC to do so.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
Since we're replacing the k3s rolebindings.yaml in rke2, we should allow
renaming this so that we can use the white-labeled name downstream.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
Before this change, k3s configured the scheduler and controller's
insecure ports to listen on 0.0.0.0. Those ports include pprof, which
provides a DoS vector at the very least.
These ports are only enabled for componentstatus checks in the first
place, and componentstatus is hardcoded to only do the check on
localhost anyway (see
https://github.com/kubernetes/kubernetes/blob/v1.18.2/pkg/registry/core/rest/storage_core.go#L341-L344),
so there shouldn't be any downside to switching them to listen only on
localhost.
In rke2 everything is a static pod so this causes a chicken and egg situation
in which we need the kubelet running before the kube-apiserver can be
launched. By starting the apiserver in the background this allows us to
do this odd bootstrapping.
In k3s today the kubernetes API and the /v1-k3s API are combined into
one http server. In rke2 we are running unmodified, non-embedded Kubernetes
and as such it is preferred to run k8s and the /v1-k3s API on different
ports. The /v1-k3s API port is called the SupervisorPort in the code.
To support this separation of ports a new shim was added on the client in
then pkg/agent/proxy package that will launch two load balancers instead
of just one load balancer. One load balancer for 6443 and the other
for 9345 (which is the supervisor port).
