问题描述
对 Kubernetes APIserver 进行优化的时候，需要查看其性能指标，如何开启性能指标分析。
问题分析
Kubernetes APIserver 提供了参数，可以确定是否开启了性能分析。
问题解决
1.查看是否开启用性能分析
ps aux |grep kube-apiserver |grep profiling
# output:（显示为空即为默认开启）
2.安装go
$ wget -P /usr/local/src/ https://go.dev/dl/go1.17.5.linux-amd64.tar.gz
$ tar -C /usr/local -xzf go1.17.5.linux-amd64.tar.gz
$ export PATH=$PATH:/usr/local/go/bin
3.开启代理
$ kubectl proxy --address='0.0.0.0' --accept-hosts='^*$'
4.查看
$ go tool pprof http://192.168.0.170:8001/debug/pprof/heap
Fetching profile over HTTP from http://192.168.0.170:8001/debug/pprof/heap
Saved profile in /root/pprof/pprof.kube-apiserver.alloc_objects.alloc_space.inuse_objects.inuse_space.006.pb.gz
File: kube-apiserver
Type: inuse_space
Time: Mar 4, 2022 at 2:50pm (CST)
Entering interactive mode (type "help" for commands, "o" for options)
# 进入交互界面后，输入top 20查看内存使用前20的函数调用
(pprof) top 20
Showing nodes accounting for 80.29MB, 64.17% of 125.12MB total
Dropped 265 nodes (cum <= 0.63MB)
Showing top 20 nodes out of 407
flat flat% sum% cum cum%
33.01MB 26.38% 26.38% 33.01MB 26.38% k8s.io/kubernetes/vendor/go.uber.org/zap/zapcore.newCounters
6.38MB 5.10% 31.48% 6.38MB 5.10% k8s.io/kubernetes/vendor/google.golang.org/grpc/internal/transport.newBufWriter
5.51MB 4.41% 35.89% 5.51MB 4.41% regexp.onePassCopy
4.50MB 3.60% 39.49% 5.50MB 4.40% k8s.io/kubernetes/vendor/k8s.io/kube-openapi/pkg/schemaconv.(*convert).VisitKind
4.07MB 3.25% 42.74% 4.07MB 3.25% encoding/json.Marshal
3.09MB 2.47% 45.22% 3.09MB 2.47% bufio.NewReaderSize
3.01MB 2.41% 47.62% 3.01MB 2.41% k8s.io/kubernetes/vendor/k8s.io/apiserver/pkg/server/mux.(*PathRecorderMux).trackCallers
2.51MB 2.00% 49.63% 6.51MB 5.20% k8s.io/kubernetes/vendor/k8s.io/kube-openapi/pkg/builder.(*openAPI).buildOperations
2.50MB 2.00% 51.63% 2.50MB 2.00% reflect.mapassign
2MB 1.60% 53.23% 2MB 1.60% k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/apis/meta/v1.(*FieldsV1).Unmarshal
2MB 1.60% 54.83% 3MB 2.40% k8s.io/kubernetes/vendor/k8s.io/kube-openapi/pkg/builder.(*openAPI).toSchema
1.53MB 1.22% 56.05% 1.53MB 1.22% bytes.makeSlice
1.52MB 1.21% 57.26% 1.52MB 1.21% k8s.io/kubernetes/vendor/k8s.io/apiserver/pkg/storage/cacher.NewCacherFromConfig
1.51MB 1.20% 58.47% 8.01MB 6.41% k8s.io/kubernetes/vendor/k8s.io/kube-openapi/pkg/builder.(*openAPI).buildPaths
1.50MB 1.20% 59.67% 1.50MB 1.20% encoding/json.(*decodeState).literalStore
1.50MB 1.20% 60.87% 1.50MB 1.20% k8s.io/kubernetes/vendor/k8s.io/kube-openapi/pkg/handler.PruneDefaultsSchema
1.08MB 0.87% 61.73% 1.08MB 0.87% k8s.io/kubernetes/vendor/k8s.io/kube-openapi/pkg/aggregator.mergeSpecs
1.04MB 0.83% 62.56% 1.04MB 0.83% k8s.io/kubernetes/vendor/google.golang.org/protobuf/internal/strs.(*Builder).AppendFullName
1.01MB 0.81% 63.37% 1.01MB 0.81% k8s.io/kubernetes/vendor/github.com/beorn7/perks/quantile.newStream
1MB 0.8% 64.17% 1MB 0.8% regexp/syntax.(*compiler).inst
(pprof)
如果您有其他问题，欢迎您联系火山引擎技术支持服务
