記錄一下k8s 1.23 及keda 2.7.1 安裝測試過程。

k8s 安裝

指定國內registry 及版本進行安裝：

kubeadm init --apiserver-advertise-address=192.168.XXX.XXX --image-repository \registry.aliyuncs.com/google_containers --kubernetes-version v1.23.5 \ --pod-network-cidr=10.244.0.0/16kubeadm join 192.168.XXX.XXX:6443 --token t2o9eq.xxxx \--discovery-token-ca-cert-hash sha256:xxxxcp -i /etc/kubernetes/admin.conf $HOME/.kube/config

查看結果：

root@ubuntu:~/k8s# kubectl get nodes NAME STATUS ROLES AGE VERSION ubuntu Ready control-plane,master 2m v1.23.7 ubuntu152 Ready <none> 59s v1.23.7 ubuntu153 Ready <none> 50s v1.23.7 root@ubuntu:~/k8s# kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system coredns-6d8c4cb4d-fp5gn 1/1 Running 0 107s kube-system coredns-6d8c4cb4d-rb5c5 1/1 Running 0 107s kube-system etcd-ubuntu 1/1 Running 4 2m13s kube-system kube-apiserver-ubuntu 1/1 Running 5 2m6s kube-system kube-controller-manager-ubuntu 1/1 Running 0 2m10s kube-system kube-proxy-jszpl 1/1 Running 0 73s kube-system kube-proxy-m7942 1/1 Running 0 107s kube-system kube-proxy-qg9mt 1/1 Running 0 64s kube-system kube-scheduler-ubuntu 1/1 Running 12 2m7s

安裝flannel及metrics-server

kubectl apply -f flannel/kube-flannel.yml

安裝metric-server，修改為國內的registry及不是要tls（生產不建議跳過tls）

spec:containers:- args:- --cert-dir=/tmp- --secure-port=4443- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname- --kubelet-use-node-status-port- --metric-resolution=15s- --kubelet-insecure-tlsimage: registry.aliyuncs.com/google_containers/metrics-server:v0.6.1imagePullPolicy: IfNotPresent

kubectl apply -f metrics-server/metrics-server.yaml

查看metrics-server是否成功安裝：
kubectl top pod --all-namespaces;

安裝keda

先編譯好app及dummy image并分發到registry或者各node，注意 app的dockerfile少了 go build。

FROM golang:1.15WORKDIR /go/src/app COPY helper/ . RUN go env -w GOPROXY=https://goproxy.cnRUN go get -v ./...RUN go install -v . RUN go build ENTRYPOINT ["/go/bin/keda-talk"]

kubectl apply -f keda-2.7.1.yaml

kubectl apply -f deployment/dummy-deployment.yaml
kubectl apply -f deployment/app-deployment.yaml
kubectl apply -f deployment/redis-deployment.yaml

keda redis Scaler測試

kubectl apply -f keda/redis-hpa.yamlkubectl exec -it $(kubectl get pods | grep "server" | cut -f 1 -d " ") keda-talk redis publish

keda-operator 默認會出現如下錯誤

##1.6545075479686694e+09 ERROR controller.scaledobject Reconciler error {"reconciler group": #"keda.sh", "reconciler kind": "ScaledObject", "name": "redis-scaledobject", "namespace": "default", "error": "connection to redis failed: dial tcp: address REDIS_ADDRESS: missing port in address"}

或

1.6545067911331463e+09 ERROR controller.scaledobject Failed to create new HPA resource {"reconciler group": "keda.sh", "reconciler kind": "ScaledObject", "name": "redis-scaledobject", "namespace": "default", "HPA.Namespace": "default", "HPA.Name": "keda-hpa-redis-scaledobject", "error": "connection to redis failed: dial tcp: lookup redis on 10.96.0.10:53: no such host"}

原因是redis-hpa和keda operator處于不同namespace，調整redis-hpa yaml文件中的address 如下：

spec:maxReplicaCount: 4pollingInterval: 3 # Optional. Default: 30 secondscooldownPeriod: 5 # Optional. Default: 300 secondsscaleTargetRef:name: dummytriggers:- type: redismetadata: # addressFromEnv: REDIS_ADDRESSlistName: defaultlistLength: "10"enableTLS: "false"address: redis.default.svc.cluster.local:6379

再次部署并查看hpa是否創建

root@ubuntu:~/k8s/keda/keda-example-master# kubectl delete -f keda/redis-hpa.yaml scaledobject.keda.sh "redis-scaledobject" deleted root@ubuntu:~/k8s/keda/keda-example-master# kubectl apply -f keda/redis-hpa.yaml scaledobject.keda.sh/redis-scaledobject created root@ubuntu:~/k8s/keda/keda-example-master# kubectl get hpa -o wide --all-namespaces NAMESPACE NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE default keda-hpa-redis-scaledobject Deployment/dummy <unknown>/10 (avg) 1 4 0 3s

執行測試命令

kubectl exec -it $(k get pods | grep "server" | cut -f 1 -d " ") keda-talk redis publish

查看結果

root@ubuntu:~/k8s/keda/keda-example-master# kubectl get pods -o wide --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES default dummy-79d8bb5844-hsm2t 1/1 Running 0 20s 10.244.1.6 ubuntu152 <none> <none> default dummy-79d8bb5844-lcv6n 1/1 Running 0 20s 10.244.2.7 ubuntu153 <none> <none> default dummy-79d8bb5844-llw4b 1/1 Running 0 19s 10.244.2.8 ubuntu153 <none> <none> default dummy-79d8bb5844-r8jqs 1/1 Running 1 (113s ago) 168m 10.244.1.4 ubuntu152 <none> <none> default redis-db4894674-676q2 1/1 Running 0 165m 10.244.1.5 ubuntu152 <none> <none> default server-5c74b4668c-69225 1/1 Running 0 167m 10.244.2.6 ubuntu153 <none> <none> keda keda-metrics-apiserver-6c7d49b596-8lbj4 1/1 Running 0 175m 10.244.2.4 ubuntu153 <none> <none> keda keda-operator-d9f5579-qjp57 1/1 Running 0 175m 10.244.2.5 ubuntu153 <none> <none> kube-system coredns-6d8c4cb4d-fp5gn 1/1 Running 0 6h45m 10.244.0.2 ubuntu <none> <none> kube-system coredns-6d8c4cb4d-rb5c5 1/1 Running 0 6h45m 10.244.0.3 ubuntu <none> <none> kube-system etcd-ubuntu 1/1 Running 4 6h46m 192.168.XXX.XXX ubuntu <none> <none> kube-system kube-apiserver-ubuntu 1/1 Running 5 6h45m 192.168.XXX.XXX ubuntu <none> <none> kube-system kube-controller-manager-ubuntu 1/1 Running 0 6h45m 192.168.XXX.XXX ubuntu <none> <none> kube-system kube-flannel-ds-gmwbn 1/1 Running 10 (6h17m ago) 6h41m 192.168.XXX.XXX ubuntu153 <none> <none> kube-system kube-flannel-ds-ptdxk 1/1 Running 0 6h41m 192.168.XXX.XXX ubuntu <none> <none> kube-system kube-flannel-ds-t6vjw 1/1 Running 10 (6h18m ago) 6h41m 192.168.XXX.XXX ubuntu152 <none> <none> kube-system kube-proxy-jszpl 1/1 Running 1 (6h16m ago) 6h45m 192.168.XXX.XXX ubuntu152 <none> <none> kube-system kube-proxy-m7942 1/1 Running 0 6h45m 192.168.XXX.XXX ubuntu <none> <none> kube-system kube-proxy-qg9mt 1/1 Running 1 (6h17m ago) 6h44m 192.168.XXX.XXX ubuntu153 <none> <none> kube-system kube-scheduler-ubuntu 1/1 Running 12 6h45m 192.168.XXX.XXX ubuntu <none> <none> kube-system metrics-server-7fd564dc66-446dd 1/1 Running 0 3h9m 10.244.1.3 ubuntu152 <none> <none> root@ubuntu:~/k8s/keda/keda-example-master#

總結

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