To enable rate limiting, needed for GA graduation,
we need to pass more parameters to the already crowded
`ListenAndServePodresources` function.
To tidy up a bit, pack the parameters in a helper struct,
with no intended changes in behavior.
Signed-off-by: Francesco Romani <fromani@redhat.com>
Provide an administrator a streaming view of journal logs on Linux
systems using journalctl, and event logs on Windows systems using the
Get-WinEvent PowerShell cmdlet without them having to implement a client
side reader.
Only available to cluster admins.
The implementation for journald on Linux was originally done by Clayton
Coleman.
Introduce a heuristics approach to query logs
The logs query for node objects will follow a heuristics approach
when asked to query for logs from a service. If asked to get the
logs from a service foobar, it will first check if foobar logs to the
native OS service log provider. If unable to get logs from these, it
will attempt to get logs from /var/foobar, /var/log/foobar.log or
/var/log/foobar/foobar.log in that order.
The logs sub-command can also directly serve a file if the query looks
like a file.
Co-authored-by: Clayton Coleman <ccoleman@redhat.com>
Co-authored-by: Christian Glombek <cglombek@redhat.com>
Implement DOS prevention wiring a global rate limit for podresources
API. The goal here is not to introduce a general ratelimiting solution
for the kubelet (we need more research and discussion to get there),
but rather to prevent misuse of the API.
Known limitations:
- the rate limits value (QPS, BurstTokens) are hardcoded to
"high enough" values.
Enabling user-configuration would require more discussion
and sweeping changes to the other kubelet endpoints, so it
is postponed for now.
- the rate limiting is global. Malicious clients can starve other
clients consuming the QPS quota.
Add e2e test to exercise the flow, because the wiring itself
is mostly boilerplate and API adaptation.
To enable rate limiting, needed for GA graduation,
we need to pass more parameters to the already crowded
`ListenAndServePodresources` function.
To tidy up a bit, pack the parameters in a helper struct,
with no intended changes in behavior.
Signed-off-by: Francesco Romani <fromani@redhat.com>
Currently, there are some unit tests that are failing on Windows due to
various reasons:
- On Windows, consecutive time.Now() calls may return the same timestamp, which would cause
the TestFreeSpaceRemoveByLeastRecentlyUsed test to flake.
- tests in kuberuntime_container_windows_test.go fail on Nodes that have fewer than 3 CPUs,
expecting the CPU max set to be more than 100% of available CPUs, which is not possible.
- calls in summary_windows_test.go are missing context.
- filterTerminatedContainerInfoAndAssembleByPodCgroupKey will filter and group container
information by the Pod cgroup key, if it exists. However, we don't have cgroups on Windows,
thus we can't make the same assertions.
Currently, there are some unit tests that are failing on Windows due to
various reasons:
- config options not supported on Windows.
- files not closed, which means that they cannot be removed / renamed.
- paths not properly joined (filepath.Join should be used).
- time.Now() is not as precise on Windows, which means that 2
consecutive calls may return the same timestamp.
- different error messages on Windows.
- files have \r\n line endings on Windows.
- /tmp directory being used, which might not exist on Windows. Instead,
the OS-specific Temp directory should be used.
- the default value for Kubelet's EvictionHard field was containing
OS-specific fields. This is now moved, the field is now set during
Kubelet's initialization, after the config file is read.
- Run hack/update-codegen.sh
- Run hack/update-generated-device-plugin.sh
- Run hack/update-generated-protobuf.sh
- Run hack/update-generated-runtime.sh
- Run hack/update-generated-swagger-docs.sh
- Run hack/update-openapi-spec.sh
- Run hack/update-gofmt.sh
Signed-off-by: Davanum Srinivas <davanum@gmail.com>
cAdvisor has code to expose OOM metrics since 0.40.0, but this was not
included in Kubelet so far. This commit enables it.
Signed-off-by: Jorik Jonker <jorik.jonker@eu.equinix.com>
