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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$ 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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$ 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

最近更新 1mo ago