Linkerd2

Linkerd2 （曾命名为 Conduit） 是 Buoyant 公司推出的下一代轻量级服务网格框架，开源在 https://github.com/linkerd/linkerd2。与 linkerd 不同的是，它专用于 Kubernetes 集群中，并且比 linkerd 更轻量级（基于 Rust 和 Go，没有了 JVM 等大内存的开销），可以以 sidecar 的方式把代理服务跟实际服务的 Pod 运行在一起（这点跟 Istio 类似）。Linkerd2 的主要特性包括：
轻量级，速度快，每个代理容器仅占用 10mb RSS，并且额外延迟只有亚毫妙级
安全，基于 Rust，默认开启 TLS
端到端可视化
增强 Kubernetes 的可靠性、可视性以及安全性
部署
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$ linkerd install | kubectl apply -f -
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namespace/linkerd configured
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serviceaccount/linkerd-controller configured
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clusterrole.rbac.authorization.k8s.io/linkerd-linkerd-controller configured
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clusterrolebinding.rbac.authorization.k8s.io/linkerd-linkerd-controller configured
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serviceaccount/linkerd-prometheus configured
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clusterrole.rbac.authorization.k8s.io/linkerd-linkerd-prometheus configured
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clusterrolebinding.rbac.authorization.k8s.io/linkerd-linkerd-prometheus configured
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service/api configured
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service/proxy-api configured
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deployment.extensions/controller configured
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service/web configured
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deployment.extensions/web configured
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service/prometheus configured
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deployment.extensions/prometheus configured
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configmap/prometheus-config configured
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service/grafana configured
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deployment.extensions/grafana configured
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configmap/grafana-config configured
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​
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$ kubectl -n linkerd get svc
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NAME         TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)             AGE
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api          ClusterIP   10.0.173.27    <none>        8085/TCP            163m
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grafana      ClusterIP   10.0.49.44     <none>        3000/TCP            163m
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prometheus   ClusterIP   10.0.205.82    <none>        9090/TCP            163m
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proxy-api    ClusterIP   10.0.170.201   <none>        8086/TCP            163m
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web          ClusterIP   10.0.88.136    <none>        8084/TCP,9994/TCP   163m
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​
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$ kubectl -n linkerd get pod
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NAME                          READY     STATUS    RESTARTS   AGE
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controller-67489d768d-75wjz   5/5       Running   0          163m
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grafana-5df745d8b8-pv6tf      2/2       Running   0          163m
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prometheus-d96f9bf89-2s6jg    2/2       Running   0          163m
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web-5cd59f97b6-wf8nk          2/2       Running   0          57s
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Dashboard
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$ linkerd dashboard
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Linkerd dashboard available at:
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http://127.0.0.1:37737/api/v1/namespaces/linkerd/services/web:http/proxy/
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Grafana dashboard available at:
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http://127.0.0.1:37737/api/v1/namespaces/linkerd/services/grafana:http/proxy/
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Opening Linkerd dashboard in the default browser
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示例应用
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curl https://run.linkerd.io/emojivoto.yml \
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  | linkerd inject - \
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  | kubectl apply -f -
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查看服务的网络流量统计情况：
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linkerd -n emojivoto stat deployment
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NAME       MESHED   SUCCESS      RPS   LATENCY_P50   LATENCY_P95   LATENCY_P99   TLS
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emoji         1/1   100.00%   8.1rps           1ms           1ms           1ms    0%
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vote-bot      1/1         -        -             -             -             -     -
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voting        1/1    87.88%   1.1rps           1ms           1ms           1ms    0%
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web           1/1    93.65%   2.1rps           1ms           9ms          88ms    0%
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跟踪服务的网络流量
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$ linkerd -n emojivoto tap deploy voting
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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
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rsp id=0:809 src=10.244.6.239:57202 dst=10.244.1.237:8080 :status=200 latency=478µs
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end id=0:809 src=10.244.6.239:57202 dst=10.244.1.237:8080 grpc-status=OK duration=7µs response-length=5B
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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
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rsp id=0:810 src=10.244.6.239:57202 dst=10.244.1.237:8080 :status=200 latency=419µs
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end id=0:810 src=10.244.6.239:57202 dst=10.244.1.237:8080 grpc-status=OK duration=8µs response-length=5B
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参考文档
​A SERVICE MESH FOR KUBERNETES​
​Service Mesh Pattern​
​https://linkerd.io/2/overview/​

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