二进制Kubernetes已经完成安装，本文将对安装的服务进行一次review.
一、服务状态
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[root@k8s-master01 ~]# kubectl get node NAME STATUS ROLES AGE VERSION k8s-master01 Ready <none> 13h v1.25.0 k8s-master02 Ready <none> 13h v1.25.0 k8s-master03 Ready <none> 13h v1.25.0 k8s-node01 Ready <none> 13h v1.25.0 k8s-node02 Ready <none> 13h v1.25.0 k8s-node03 Ready <none> 13h v1.25.0 [root@k8s-master01 ~]# netstat -tunlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:179 0.0.0.0:* LISTEN 24352/bird tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN 809/haproxy tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 678/sshd: /usr/sbin tcp 0 0 127.0.0.1:9099 0.0.0.0:* LISTEN 24181/calico-node tcp 0 0 127.0.0.1:9098 0.0.0.0:* LISTEN 23846/calico-typha tcp 0 0 192.168.31.11:2379 0.0.0.0:* LISTEN 673/etcd tcp 0 0 192.168.31.11:2380 0.0.0.0:* LISTEN 673/etcd tcp 0 0 127.0.0.1:34589 0.0.0.0:* LISTEN 680/containerd tcp 0 0 127.0.0.1:8443 0.0.0.0:* LISTEN 809/haproxy tcp 0 0 127.0.0.1:10249 0.0.0.0:* LISTEN 2483/kube-proxy tcp 0 0 127.0.0.1:10248 0.0.0.0:* LISTEN 645/kubelet tcp 0 0 127.0.0.1:2379 0.0.0.0:* LISTEN 673/etcd tcp6 0 0 :::10250 :::* LISTEN 645/kubelet tcp6 0 0 :::10255 :::* LISTEN 645/kubelet tcp6 0 0 :::10256 :::* LISTEN 2483/kube-proxy tcp6 0 0 :::10257 :::* LISTEN 675/kube-controller tcp6 0 0 :::10259 :::* LISTEN 676/kube-scheduler tcp6 0 0 :::22 :::* LISTEN 678/sshd: /usr/sbin tcp6 0 0 :::6443 :::* LISTEN 674/kube-apiserver tcp6 0 0 :::5473 :::* LISTEN 23846/calico-typha udp 0 0 0.0.0.0:39146 0.0.0.0:* 809/haproxy udp 0 0 127.0.0.1:323 0.0.0.0:* 653/chronyd udp 0 0 0.0.0.0:60174 0.0.0.0:* 809/haproxy udp6 0 0 ::1:323 :::* 653/chronyd [root@k8s-master01 ~]# kubectl get po -n kube-system NAME READY STATUS RESTARTS AGE calico-kube-controllers-86d8c4fb68-2wz7r 1/1 Running 6 (129m ago) 135m calico-node-c4k2t 1/1 Running 6 (129m ago) 135m calico-node-cqc8m 1/1 Running 6 (128m ago) 135m calico-node-lwt6t 1/1 Running 6 (128m ago) 135m calico-node-np456 1/1 Running 6 (128m ago) 135m calico-node-qppwd 1/1 Running 6 (127m ago) 135m calico-node-s6c7w 1/1 Running 6 (129m ago) 135m calico-typha-768795f74d-lqgr9 1/1 Running 0 135m coredns-5bc764d4f4-w85nz 1/1 Running 0 117m metrics-server-6b4f467564-tq682 1/1 Running 0 106m [root@k8s-master01 ~]# kubectl get po NAME READY STATUS RESTARTS AGE busybox 0/1 ContainerCreating 0 15s [root@k8s-master01 ~]# kubectl get po NAME READY STATUS RESTARTS AGE busybox 0/1 ErrImagePull 0 23s [root@k8s-master01 ~]# kubectl get po NAME READY STATUS RESTARTS AGE busybox 0/1 ErrImagePull 0 26s [root@k8s-master01 ~]# kubectl get po NAME READY STATUS RESTARTS AGE busybox 0/1 ImagePullBackOff 0 40s [root@k8s-master01 ~]# kubectl get po NAME READY STATUS RESTARTS AGE busybox 0/1 ErrImagePull 0 65s [root@k8s-master01 ~]# kubectl descirbe pod busybox error: unknown command "descirbe" for "kubectl" Did you mean this? describe [root@k8s-master01 ~]# kubectl describe pod busybox Name: busybox Namespace: default Priority: 0 Service Account: default Node: k8s-master03/192.168.31.13 Start Time: Thu, 27 Oct 2022 13:00:43 +0800 Labels: <none> Annotations: cni.projectcalico.org/containerID: a76b382e10371e8615f1ce27f0726622753e3339597ba15afdd3b3130fad7820 cni.projectcalico.org/podIP: 172.18.195.1/32 cni.projectcalico.org/podIPs: 172.18.195.1/32 Status: Pending IP: 172.18.195.1 IPs: IP: 172.18.195.1 Containers: busybox: Container ID: Image: busybox:1.28 Image ID: Port: <none> Host Port: <none> Command: sleep 3600 State: Waiting Reason: ImagePullBackOff Ready: False Restart Count: 0 Environment: <none> Mounts: /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-sl7td (ro) Conditions: Type Status Initialized True Ready False ContainersReady False PodScheduled True Volumes: kube-api-access-sl7td: Type: Projected (a volume that contains injected data from multiple sources) TokenExpirationSeconds: 3607 ConfigMapName: kube-root-ca.crt ConfigMapOptional: <nil> DownwardAPI: true QoS Class: BestEffort Node-Selectors: <none> Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s node.kubernetes.io/unreachable:NoExecute op=Exists for 300s Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Scheduled 3m16s default-scheduler Successfully assigned default/busybox to k8s-master03 Warning Failed 2m58s kubelet Failed to pull image "busybox:1.28": rpc error: code = Unknown desc = failed to pull and unpack image "docker.io/library/busybox:1.28": failed to copy: httpReadSeeker: failed open: failed to do request: Get "https://production.cloudflare.docker.com/registry-v2/docker/registry/v2/blobs/sha256/8c/8c811b4aec35f259572d0f79207bc0678df4c736eeec50bc9fec37ed936a472a/data?verify=1666849851-k8JSHSWD2KEFOBRQJn%2FxdDp7grQ%3D": dial tcp [2606:4700::6812:7a19]:443: connect: network is unreachable Warning Failed 2m24s kubelet Failed to pull image "busybox:1.28": rpc error: code = Unknown desc = failed to pull and unpack image "docker.io/library/busybox:1.28": failed to resolve reference "docker.io/library/busybox:1.28": failed to do request: Head "https://registry-1.docker.io/v2/library/busybox/manifests/1.28": dial tcp: lookup registry-1.docker.io on 114.114.114.114:53: read udp 192.168.31.13:49039->114.114.114.114:53: i/o timeout Warning Failed 77s kubelet Failed to pull image "busybox:1.28": rpc error: code = Unknown desc = failed to pull and unpack image "docker.io/library/busybox:1.28": failed to copy: httpReadSeeker: failed open: failed to do request: Get "https://registry-1.docker.io/v2/library/busybox/blobs/sha256:07a152489297fc2bca20be96fab3527ceac5668328a30fd543a160cd689ee548": dial tcp: lookup registry-1.docker.io on 114.114.114.114:53: read udp 192.168.31.13:55233->114.114.114.114:53: i/o timeout Normal BackOff 50s (x4 over 2m58s) kubelet Back-off pulling image "busybox:1.28" Warning Failed 50s (x4 over 2m58s) kubelet Error: ImagePullBackOff Normal Pulling 37s (x4 over 3m15s) kubelet Pulling image "busybox:1.28" Warning Failed 8s (x4 over 2m58s) kubelet Error: ErrImagePull Warning Failed 8s kubelet Failed to pull image "busybox:1.28": rpc error: code = Unknown desc = failed to pull and unpack image "docker.io/library/busybox:1.28": failed to copy: httpReadSeeker: failed open: failed to do request: Get "https://production.cloudflare.docker.com/registry-v2/docker/registry/v2/blobs/sha256/8c/8c811b4aec35f259572d0f79207bc0678df4c736eeec50bc9fec37ed936a472a/data?verify=1666850011-5gyHqHJeJ%2FbwwtUDqqHOLPo17zs%3D": dial tcp: lookup production.cloudflare.docker.com on 114.114.114.114:53: read udp 192.168.31.13:55549->114.114.114.114:53: i/o timeout |
通一个namespace
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[root@k8s-master01 ~]# kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 192.168.31.1 <none> 443/TCP 15h [root@k8s-master01 ~]# kubectl exec busybox -n default -- nslookup kubernetes Server: 192.168.31.10 Address 1: 192.168.31.10 kube-dns.kube-system.svc.cluster.local Name: kubernetes Address 1: 192.168.31.1 kubernetes.default.svc.cluster.local |
跨namespace
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[root@k8s-master01 ~]# kubectl exec busybox -n default -- nslookup kube-dns.kube-system Server: 192.168.31.10 Address 1: 192.168.31.10 kube-dns.kube-system.svc.cluster.local Name: kube-dns.kube-system Address 1: 192.168.31.10 kube-dns.kube-system.svc.cluster.local |
每个节点都必须要能访问Kubernetes的kubernetes svc 443和kube-dns的service 53
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[root@k8s-master01 ~]# telnet 192.168.31.1 443 Trying 192.168.31.1... Connected to 192.168.31.1. Escape character is '^]'. Connection closed by foreign host. [root@k8s-node03 ~]# telnet 192.168.31.1 443 Trying 192.168.31.1... Connected to 192.168.31.1. Escape character is '^]'. Connection closed by foreign host. [root@k8s-master01 ~]# kubectl get svc -n kube-system NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE calico-typha ClusterIP 192.168.31.132 <none> 5473/TCP 3h20m kube-dns ClusterIP 192.168.31.10 <none> 53/UDP,53/TCP,9153/TCP 3h1m metrics-server ClusterIP 192.168.31.118 <none> 443/TCP 170m [root@k8s-master01 ~]# telnet 192.168.31.10 53 Trying 192.168.31.10... Connected to 192.168.31.10. Escape character is '^]'. Connection closed by foreign host. |
4.Pod和Pod之前要能通
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[root@k8s-master01 ~]# kubectl get po -n kube-system -owide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES calico-kube-controllers-86d8c4fb68-2wz7r 1/1 Running 8 (22m ago) 3h22m 172.25.244.195 k8s-master01 <none> <none> calico-node-c4k2t 1/1 Running 8 (23m ago) 3h22m 192.168.31.21 k8s-node01 <none> <none> calico-node-cqc8m 1/1 Running 8 (23m ago) 3h22m 192.168.31.22 k8s-node02 <none> <none> calico-node-lwt6t 1/1 Running 8 (21m ago) 3h22m 192.168.31.13 k8s-master03 <none> <none> calico-node-np456 1/1 Running 9 (22m ago) 3h22m 192.168.31.11 k8s-master01 <none> <none> calico-node-qppwd 1/1 Running 8 (23m ago) 3h22m 192.168.31.12 k8s-master02 <none> <none> calico-node-s6c7w 1/1 Running 8 (23m ago) 3h22m 192.168.31.23 k8s-node03 <none> <none> calico-typha-768795f74d-lqgr9 1/1 Running 2 (22m ago) 3h22m 192.168.31.11 k8s-master01 <none> <none> coredns-5bc764d4f4-w85nz 1/1 Running 2 (23m ago) 3h3m 172.25.92.67 k8s-master02 <none> <none> metrics-server-6b4f467564-tq682 1/1 Running 3 (21m ago) 172m 172.17.125.3 k8s-node01 <none> <none> [root@k8s-master01 ~]# kubectl exec -ti calico-node-lwt6t -n kube-system -- bash Defaulted container "calico-node" out of: calico-node, upgrade-ipam (init), install-cni (init), mount-bpffs (init) [root@k8s-master03 /]# |
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