After moving Permit() to the scheduling cycle test PermitPlugin should
no longer wait inside Permit() for another pod to enter Permit() and become waiting pod.
In the past this was a way to make test work regardless of order in
which pods enter Permit(), but now only one Permit() can be executed at
any given moment and waiting for another pod to enter Permit() inside
Permit() leads to timeouts.
In this change waitAndRejectPermit and waitAndAllowPermit flags make first
pod to enter Permit() a waiting pod and second pod to enter Permit()
either rejecting or allowing pod.
Mentioned in #88469
1. move the integration test of TaintBasedEvictions to test/integration/node
2. move the e2e test of TaintBasedEvictions e2e test/e2e/node
3. modify the conformance file to adapt the TaintBasedEviction test
Close outbound connections when using a cert callback and certificates rotate. This means that we won't get into a situation where we have open TLS connections using expires certs, which would get unauthorized errors at the apiserver
Attempt to retrieve a new certificate if open connections near expiry, to prevent the case where the cert expires but we haven't yet opened a new TLS connection and so GetClientCertificate hasn't been called.
Move certificate rotation logic to a separate function
Rely on generic transport approach to handle closing TLS client connections in exec plugin; no need to use a custom dialer as this is now the default behaviour of the transport when faced with a cert callback. As a result of handling this case, it is now safe to apply the transport approach even in cases where there is a custom Dialer (this will not affect kubelet connrotation behaviour, because that uses a custom transport, not just a dialer).
Check expiry of the full TLS certificate chain that will be presented, not only the leaf. Only do this check when the certificate actually rotates. Start the certificate as a zero value, not nil, so that we don't see a rotation when there is in fact no client certificate
Drain the timer when we first initialize it, to prevent immediate rotation. Additionally, calling Stop() on the timer isn't necessary.
Don't close connections on the first 'rotation'
Remove RotateCertFromDisk and RotateClientCertFromDisk flags.
Instead simply default to rotating certificates from disk whenever files are exclusively provided.
Add integration test for client certificate rotation
Simplify logic; rotate every 5 mins
Instead of trying to be clever and checking for rotation just before an
expiry, let's match the logic of the new apiserver cert rotation logic
as much as possible. We write a controller that checks for rotation
every 5 mins. We also check on every new connection.
Respond to review
Fix kubelet certificate rotation logic
The kubelet rotation logic seems to be broken because it expects its
cert files to end up as cert data whereas in fact they end up as a
callback. We should just call the tlsConfig GetCertificate callback
as this obtains a current cert even in cases where a static cert is
provided, and check that for validity.
Later on we can refactor all of the kubelet logic so that all it does is
write files to disk, and the cert rotation work does the rest.
Only read certificates once a second at most
Respond to review
1) Don't blat the cert file names
2) Make it more obvious where we have a neverstop
3) Naming
4) Verbosity
Avoid cache busting
Use filenames as cache keys when rotation is enabled, and add the
rotation later in the creation of the transport.
Caller should start the rotating dialer
Add continuous request rotation test
Rebase: use context in List/Watch
Swap goroutine around
Retry GETs on net.IsProbableEOF
Refactor certRotatingDialer
For simplicity, don't affect cert callbacks
To reduce change surface, lets not try to handle the case of a changing
GetCert callback in this PR. Reverting this commit should be sufficient
to handle that case in a later PR.
This PR will focus only on rotating certificate and key files.
Therefore, we don't need to modify the exec auth plugin.
Fix copyright year
In addition to getting overall performance measurements from golang benchmark,
collect metrics that provides information about insides of the scheduler itself.
This is a first step towards improving what we collect about the scheduler.
Metrics in question:
- scheduler_scheduling_algorithm_predicate_evaluation_seconds
- scheduler_scheduling_algorithm_priority_evaluation_seconds
- scheduler_binding_duration_seconds
- scheduler_e2e_scheduling_duration_seconds
Scheduling throughput is computed on the fly inside perfScheduling.
- Add handlers for service account issuer metadata.
- Add option to manually override JWKS URI.
- Add unit and integration tests.
- Add a separate ServiceAccountIssuerDiscovery feature gate.
Additional notes:
- If not explicitly overridden, the JWKS URI will be based on
the API server's external address and port.
- The metadata server is configured with the validating key set rather
than the signing key set. This allows for key rotation because tokens
can still be validated by the keys exposed in the JWKs URL, even if the
signing key has been rotated (note this may still be a short window if
tokens have short lifetimes).
- The trust model of OIDC discovery requires that the relying party
fetch the issuer metadata via HTTPS; the trust of the issuer metadata
comes from the server presenting a TLS certificate with a trust chain
back to the from the relying party's root(s) of trust. For tests, we use
a local issuer (https://kubernetes.default.svc) for the certificate
so that workloads within the cluster can authenticate it when fetching
OIDC metadata. An API server cannot validly claim https://kubernetes.io,
but within the cluster, it is the authority for kubernetes.default.svc,
according to the in-cluster config.
Co-authored-by: Michael Taufen <mtaufen@google.com>
