如何解决如何在 Istio 中 gzip stats 端点?
我们正在使用 Prometheus 抓取许多 istio-proxy sidecar 的指标。由于这些指标很多,我们希望压缩有效负载以节省一些带宽。
开箱即用的 stats 端点似乎没有被 Istio 1.8.2 压缩:
$ kubectl exec -it my-pod-0 -c server -- curl -o /dev/null -vsS --compressed http://127.0.0.1:15090/stats/prometheus
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 15090 (#0)
> GET /stats/prometheus HTTP/1.1
> Host: 127.0.0.1:15090
> User-Agent: curl/7.61.1
> Accept: */*
> Accept-Encoding: deflate,gzip
>
< HTTP/1.1 200 OK
< content-type: text/plain; charset=UTF-8
< cache-control: no-cache,max-age=0
< x-content-type-options: nosniff
< date: Fri,19 Feb 2021 10:42:25 GMT
< server: envoy
< x-envoy-upstream-service-time: 2
< transfer-encoding: chunked
<
{ [26267 bytes data]
* Connection #0 to host 127.0.0.1 left intact
如何让 sidecar 压缩统计流量?
到目前为止,我尝试添加一个 EnvoyFilter,但老实说,我对 Envoy 的内部结构一无所知,而且我没有找到帮助我理解它的文档。
我的理解是我必须将 compress filter 添加到此:
$ istioctl proxy-config listeners maintenance-0 --port 15090 -o json | gron
json = [];
json[0] = {};
json[0].address = {};
json[0].address.socketAddress = {};
json[0].address.socketAddress.address = "0.0.0.0";
json[0].address.socketAddress.portValue = 15090;
json[0].filterChains = [];
json[0].filterChains[0] = {};
json[0].filterChains[0].filters = [];
json[0].filterChains[0].filters[0] = {};
json[0].filterChains[0].filters[0].name = "envoy.filters.network.http_connection_manager";
json[0].filterChains[0].filters[0].typedConfig = {};
json[0].filterChains[0].filters[0].typedConfig.httpFilters = [];
json[0].filterChains[0].filters[0].typedConfig.httpFilters[0] = {};
json[0].filterChains[0].filters[0].typedConfig.httpFilters[0].name = "envoy.filters.http.router";
json[0].filterChains[0].filters[0].typedConfig.httpFilters[0].typedConfig = {};
json[0].filterChains[0].filters[0].typedConfig.httpFilters[0].typedConfig["@type"] = "type.googleapis.com/envoy.extensions.filters.http.router.v3.Router";
json[0].filterChains[0].filters[0].typedConfig.routeConfig = {};
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts = [];
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0] = {};
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].domains = [];
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].domains[0] = "*";
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].name = "backend";
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].routes = [];
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].routes[0] = {};
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].routes[0].match = {};
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].routes[0].match.prefix = "/stats/prometheus";
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].routes[0].route = {};
json[0].filterChains[0].filters[0].typedConfig.routeConfig.virtualHosts[0].routes[0].route.cluster = "prometheus_stats";
json[0].filterChains[0].filters[0].typedConfig.statPrefix = "stats";
json[0].filterChains[0].filters[0].typedConfig["@type"] = "type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager";
到目前为止,我尝试了几次创建过滤器,这是我最近的一次尝试:
---
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
name: gzip
spec:
workloadSelector:
labels:
app: my-pod
configPatches:
- applyTo: HTTP_FILTER
match:
context: SIDECAR_INBOUND
listener:
filterChain:
filter:
name: envoy.http_connection_manager
subFilter:
name: envoy.router
patch:
operation: INSERT_BEFORE
value:
name: envoy.filters.http.compressor
typed_config:
'@type': type.googleapis.com/envoy.extensions.filters.http.compressor.v3.Compressor
compressor_library:
name: text_optimized
typed_config:
'@type': type.googleapis.com/envoy.extensions.compression.gzip.compressor.v3.Gzip
remove_accept_encoding_header: true
我真的不知道在 .spec.configPatches.match
部分放什么。 patch
和 applyTo
部分也可能是错误的。
解决方法
在解决 Istio 问题的帮助下,我们使其成功。我正在复制我的原始回复:https://github.com/istio/istio/issues/30987#issuecomment-822517456
我得到了一个工作示例,我们的网络使用量从 ~20MBytes/s 下降到 ~30KBytes/s(是的,从 Mega 到 Kilo ?)。起初我以为有什么错误,但数据是完整的,我用我的 CLI 做了一个简短的检查:
$ kubectl exec elasticsearch-0 -c istio-proxy -- timeout 1 curl -Ss --fail --compressed -w '%{size_download}' -i http://localhost:14090/stats/prometheus | tail -n 1
7763
$ kubectl exec elasticsearch-0 -c istio-proxy -- timeout 1 curl -Ss --fail -w '%{size_download}' -i http://localhost:14090/stats/prometheus | tail -n 1
330315
它只有原始尺寸的 2.35%,并且两者的线数相同!
这是自定义引导程序,需要使用 sidecar.istio.io/bootstrapOverride: "istio-custom-bootstrap-config"
添加到每个 Pod
注释。
apiVersion: v1
kind: ConfigMap
metadata:
annotations:
name: istio-custom-bootstrap-config
namespace: default
data:
custom_bootstrap.json: |-
{
"staticResources": {
"listeners": [
{
"address": {
"socketAddress": {
"address": "0.0.0.0","portValue": 14090
}
},"filterChains": [
{
"filters": [
{
"name": "envoy.filters.network.http_connection_manager","typedConfig": {
"@type": "type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager","httpFilters": [
{
"name": "envoy.filters.http.compressor","typed_config": {
"@type": "type.googleapis.com/envoy.extensions.filters.http.compressor.v3.Compressor","compressor_library": {
"name": "text_optimized","typed_config": {
"@type": "type.googleapis.com/envoy.extensions.compression.gzip.compressor.v3.Gzip"
}
},"remove_accept_encoding_header": true
}
},{
"name": "envoy.filters.http.router","typedConfig": {
"@type": "type.googleapis.com/envoy.extensions.filters.http.router.v3.Router"
}
}
],"routeConfig": {
"virtualHosts": [
{
"domains": [
"*"
],"name": "backend","routes": [
{
"match": {
"prefix": "/stats/prometheus"
},"route": {
"cluster": "prometheus_stats"
}
}
]
}
]
},"statPrefix": "stats"
}
}
]
}
]
}
]
}
}
我不得不更改端口,因为在将来的更新中向 staticResources.listeners
添加任何内容时很容易维护。
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