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Implement service health check in Antrea-agent (#4120)
When services are created with "externalTrafficPolicy: Local", a "healthCheckNodePort" is created in the k8s service object. kube-proxy in turn will listen on this port and answer queries on http://0.0.0.0:healthCheckNodePort/healthz". In kube-proxy replacement mode, antrea does not support this feature. This becomes more important for Windows support as userspace kube-proxy is being deprecated. This commit implements this feature in Antrea and is inspired by the same feature in upstream kube-proxy with some differences. The predominant difference is that upstream kube-proxy goes through all endpoints of cluster in each iteration of endpoints:update() to find the local endpoints. This has been changed here to only look for changed endpoints. Signed-off-by: Guru Shetty <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| Package proxy/healthcheck is copied from [k8s.io/kubernetes@/v1.24.4](https://github.com/kubernetes/kubernetes/tree/v1.24.4) to avoid importing the whole kubernetes repo. |
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| /* | ||
| Copyright 2016 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package healthcheck | ||
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| import ( | ||
| "net" | ||
| "net/http" | ||
| ) | ||
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| // listener allows for testing of ServiceHealthServer and ProxierHealthServer. | ||
| type listener interface { | ||
| // Listen is very much like net.Listen, except the first arg (network) is | ||
| // fixed to be "tcp". | ||
| Listen(addr string) (net.Listener, error) | ||
| } | ||
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| // httpServerFactory allows for testing of ServiceHealthServer and ProxierHealthServer. | ||
| type httpServerFactory interface { | ||
| // New creates an instance of a type satisfying HTTPServer. This is | ||
| // designed to include http.Server. | ||
| New(addr string, handler http.Handler) httpServer | ||
| } | ||
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| // httpServer allows for testing of ServiceHealthServer and ProxierHealthServer. | ||
| // It is designed so that http.Server satisfies this interface, | ||
| type httpServer interface { | ||
| Serve(listener net.Listener) error | ||
| } | ||
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| // Implement listener in terms of net.Listen. | ||
| type stdNetListener struct{} | ||
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| func (stdNetListener) Listen(addr string) (net.Listener, error) { | ||
| return net.Listen("tcp", addr) | ||
| } | ||
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| var _ listener = stdNetListener{} | ||
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| // Implement httpServerFactory in terms of http.Server. | ||
| type stdHTTPServerFactory struct{} | ||
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| func (stdHTTPServerFactory) New(addr string, handler http.Handler) httpServer { | ||
| return &http.Server{ | ||
| Addr: addr, | ||
| Handler: handler, | ||
| } | ||
| } | ||
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| var _ httpServerFactory = stdHTTPServerFactory{} |
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