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Envoy 内存/CPU分析

导出 Enovy 的 CPU 和 内存 profile

https://github.com/istio/istio/wiki/Analyzing-Istio-Performance#profile

Profile

On Istio 1.5 and older:

export POD=pod-name
export NS=istio-system
kubectl exec -n "$NS" "$POD" -c istio-proxy -- sh -c 'sudo mkdir -p /var/log/envoy && sudo chmod 777 /var/log/envoy && curl -X POST -s "http://localhost:15000/heapprofiler?enable=y"'
sleep 15
kubectl exec -n "$NS" "$POD" -c istio-proxy -- sh -c 'curl -X POST -s "http://localhost:15000/heapprofiler?enable=n"'
rm -rf /tmp/envoy
kubectl cp -n "$NS" "$POD":/var/log/envoy/ /tmp/envoy -c istio-proxy
kubectl cp -n "$NS" "$POD":/lib/x86_64-linux-gnu /tmp/envoy/lib -c istio-proxy
kubectl cp -n "$NS" "$POD":/usr/local/bin/envoy /tmp/envoy/lib/envoy -c istio-proxy

On Istio 1.6+

export POD=pod-name
export NS=istio-system
export PROFILER="heap" # Can also be "cpu", for a cpu profile
kubectl exec -n "$NS" "$POD" -c istio-proxy -- curl -X POST -s "http://localhost:15000/${PROFILER}profiler?enable=y"
sleep 15
kubectl exec -n "$NS" "$POD" -c istio-proxy -- curl -X POST -s "http://localhost:15000/${PROFILER}profiler?enable=n"
rm -rf /tmp/envoy
kubectl cp -n "$NS" "$POD":/var/lib/istio/data /tmp/envoy -c istio-proxy
kubectl cp -n "$NS" "$POD":/lib/x86_64-linux-gnu /tmp/envoy/lib -c istio-proxy
kubectl cp -n "$NS" "$POD":/usr/local/bin/envoy /tmp/envoy/lib/envoy -c istio-proxy

备注：有时候 docker cp envoy 会出错，可以采用 cat 命令

kubectl  -n "$NS" exec "$POD" -c istio-proxy -- cat /usr/local/bin/envoy > /tmp/envoy/lib/envoy

Visualize profile pprof installation

Install pprof, then run:

PPROF_BINARY_PATH=/tmp/envoy/lib/ pprof -pdf /tmp/envoy/lib/envoy /tmp/envoy/envoy.prof.0001.heap

Or, interactively

PPROF_BINARY_PATH=/tmp/envoy/lib/ pprof /tmp/envoy/lib/envoy /tmp/envoy/envoy.prof.0001.heap

Or, through the web UI

PPROF_BINARY_PATH=/tmp/envoy/lib/ pprof -http=localhost:8000 /tmp/envoy/lib/envoy /tmp/envoy/envoy.prof.0001.heap

采用 Envoy admin 查看内存使用情况

kubectl exec -n "$NS" "$POD" -c istio-proxy -- curl  "http://localhost:15000/memory"

输出

{
 "allocated": "221674328",
 "heap_size": "361693184",
 "pageheap_unmapped": "86106112",
 "pageheap_free": "21831680",
 "total_thread_cache": "9805104",
 "total_physical_bytes": "278470656"
}

字段含义：

https://www.envoyproxy.io/docs/envoy/latest/api-v3/admin/v3/memory.proto