Linkerd2
Linkerd2 （曾命名爲 Conduit） 是 Buoyant 公司推出的下一代輕量級服務網格框架，開源在 https://github.com/linkerd/linkerd2。與 linkerd 不同的是，它專用於 Kubernetes 集群中，並且比 linkerd 更輕量級（基於 Rust 和 Go，沒有了 JVM 等大內存的開銷），可以以 sidecar 的方式把代理服務跟實際服務的 Pod 運行在一起（這點跟 Istio 類似）。Linkerd2 的主要特性包括：
輕量級，速度快，每個代理容器僅佔用 10mb RSS，並且額外延遲只有亞毫妙級
安全，基於 Rust，默認開啓 TLS
端到端可視化
增強 Kubernetes 的可靠性、可視性以及安全性
部署
$ linkerd install | kubectl apply -f -
namespace/linkerd configured
serviceaccount/linkerd-controller configured
clusterrole.rbac.authorization.k8s.io/linkerd-linkerd-controller configured
clusterrolebinding.rbac.authorization.k8s.io/linkerd-linkerd-controller configured
serviceaccount/linkerd-prometheus configured
clusterrole.rbac.authorization.k8s.io/linkerd-linkerd-prometheus configured
clusterrolebinding.rbac.authorization.k8s.io/linkerd-linkerd-prometheus configured
service/api configured
service/proxy-api configured
deployment.extensions/controller configured
service/web configured
deployment.extensions/web configured
service/prometheus configured
deployment.extensions/prometheus configured
configmap/prometheus-config configured
service/grafana configured
deployment.extensions/grafana configured
configmap/grafana-config configured
$ kubectl -n linkerd get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
api ClusterIP 10.0.173.27 <none> 8085/TCP 163m
grafana ClusterIP 10.0.49.44 <none> 3000/TCP 163m
prometheus ClusterIP 10.0.205.82 <none> 9090/TCP 163m
proxy-api ClusterIP 10.0.170.201 <none> 8086/TCP 163m
web ClusterIP 10.0.88.136 <none> 8084/TCP,9994/TCP 163m
$ kubectl -n linkerd get pod
NAME READY STATUS RESTARTS AGE
controller-67489d768d-75wjz 5/5 Running 0 163m
grafana-5df745d8b8-pv6tf 2/2 Running 0 163m
prometheus-d96f9bf89-2s6jg 2/2 Running 0 163m
web-5cd59f97b6-wf8nk 2/2 Running 0 57sDashboard
$ linkerd dashboard
Linkerd dashboard available at:
http://127.0.0.1:37737/api/v1/namespaces/linkerd/services/web:http/proxy/
Grafana dashboard available at:
http://127.0.0.1:37737/api/v1/namespaces/linkerd/services/grafana:http/proxy/
Opening Linkerd dashboard in the default browser
示例應用
curl https://run.linkerd.io/emojivoto.yml \
| linkerd inject - \
| kubectl apply -f -查看服務的網絡流量統計情況：
linkerd -n emojivoto stat deployment
NAME MESHED SUCCESS RPS LATENCY_P50 LATENCY_P95 LATENCY_P99 TLS
emoji 1/1 100.00% 8.1rps 1ms 1ms 1ms 0%
vote-bot 1/1 - - - - - -
voting 1/1 87.88% 1.1rps 1ms 1ms 1ms 0%
web 1/1 93.65% 2.1rps 1ms 9ms 88ms 0%跟蹤服務的網絡流量
$ linkerd -n emojivoto tap deploy voting
req id=0:809 src=10.244.6.239:57202 dst=10.244.1.237:8080 :method=POST :authority=voting-svc.emojivoto:8080 :path=/emojivoto.v1.VotingService/VoteDoughnut
rsp id=0:809 src=10.244.6.239:57202 dst=10.244.1.237:8080 :status=200 latency=478µs
end id=0:809 src=10.244.6.239:57202 dst=10.244.1.237:8080 grpc-status=OK duration=7µs response-length=5B
req id=0:810 src=10.244.6.239:57202 dst=10.244.1.237:8080 :method=POST :authority=voting-svc.emojivoto:8080 :path=/emojivoto.v1.VotingService/VoteDoughnut
rsp id=0:810 src=10.244.6.239:57202 dst=10.244.1.237:8080 :status=200 latency=419µs
end id=0:810 src=10.244.6.239:57202 dst=10.244.1.237:8080 grpc-status=OK duration=8µs response-length=5B參考文檔
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