Install Kubernetes
登录单节点测试环境
xiaojun@xiaotech:~$ ssh student@172.30.81.194切换root 并升级系统
国内环境先添加aliyun的apt源
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe
apt-get update && apt-get upgrade -y
安装容器运行环境docker
apt-get install -y docker.io安装kubernetes组件
国内环境添加aliyun apt源
apt-get update && apt-get install -y apt-transport-https
curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl
apt-get install -y kubeadm=1.12.1-00 kubelet=1.12.1-00 kubectl=1.12.1-00
- 选择网络模型，本文选用calico，支持networkpolicy
wget https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/rbac-kdd.yaml
wget https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/kubernetes-datastore/calico-networking/1.7/calico.yaml
calico.yaml中配置的地址必须要和kubeadm init给的参数一致
- name: CALICO_IPV4POOL_CIDR
value: "192.168.0.0/16"
- 安装kubernetes 集群master节点
国内环境特殊处理
首先生成默认配置文件
kubeadm config print-default | tee kubeadm.yaml
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.12.1
networking:
dnsDomain: cluster.local
podSubnet: "192.168.0.0/16"
serviceSubnet: 10.96.0.0/12
unifiedControlPlaneImage: ""
kubelet
# Note: This dropin only works with kubeadm and kubelet v1.11+
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
EnvironmentFile=-/etc/default/kubelet
Environment="KUBELET_POD_INFRA_CONTAINER=--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.0"
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_POD_INFRA_CONTAINER $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
安装
root@ubuntu:/home# kubeadm init --config=/home/kubeadm.yaml
W1128 17:32:44.572422 23482 common.go:105] WARNING: Detected resource kinds that may not apply: [InitConfiguration MasterConfiguration JoinConfiguration NodeConfiguration]
[config] WARNING: Ignored YAML document with GroupVersionKind kubeadm.k8s.io/v1alpha3, Kind=JoinConfiguration
[init] using Kubernetes version: v1.12.1
[preflight] running pre-flight checks
[preflight/images] Pulling images required for setting up a Kubernetes cluster
[preflight/images] This might take a minute or two, depending on the speed of your internet connection
[preflight/images] You can also perform this action in beforehand using 'kubeadm config images pull'
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[preflight] Activating the kubelet service
[certificates] Generated etcd/ca certificate and key.
[certificates] Generated etcd/server certificate and key.
[certificates] etcd/server serving cert is signed for DNS names [ubuntu localhost] and IPs [127.0.0.1 ::1]
[certificates] Generated etcd/peer certificate and key.
[certificates] etcd/peer serving cert is signed for DNS names [ubuntu localhost] and IPs [172.30.81.194 127.0.0.1 ::1]
[certificates] Generated etcd/healthcheck-client certificate and key.
[certificates] Generated apiserver-etcd-client certificate and key.
[certificates] Generated ca certificate and key.
[certificates] Generated apiserver-kubelet-client certificate and key.
[certificates] Generated apiserver certificate and key.
[certificates] apiserver serving cert is signed for DNS names [ubuntu kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 172.30.81.194]
[certificates] Generated front-proxy-ca certificate and key.
[certificates] Generated front-proxy-client certificate and key.
[certificates] valid certificates and keys now exist in "/etc/kubernetes/pki"
[certificates] Generated sa key and public key.
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
[controlplane] wrote Static Pod manifest for component kube-apiserver to "/etc/kubernetes/manifests/kube-apiserver.yaml"
[controlplane] wrote Static Pod manifest for component kube-controller-manager to "/etc/kubernetes/manifests/kube-controller-manager.yaml"
[controlplane] wrote Static Pod manifest for component kube-scheduler to "/etc/kubernetes/manifests/kube-scheduler.yaml"
[etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/manifests/etcd.yaml"
[init] waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests"
[init] this might take a minute or longer if the control plane images have to be pulled
[apiclient] All control plane components are healthy after 24.503879 seconds
[uploadconfig] storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.12" in namespace kube-system with the configuration for the kubelets in the cluster
[markmaster] Marking the node ubuntu as master by adding the label "node-role.kubernetes.io/master=''"
[markmaster] Marking the node ubuntu as master by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to the Node API object "ubuntu" as an annotation
[bootstraptoken] using token: abcdef.0123456789abcdef
[bootstraptoken] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstraptoken] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstraptoken] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstraptoken] creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes master has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
You can now join any number of machines by running the following on each node
as root:
kubeadm join 172.30.81.194:6443 --token abcdef.0123456789abcdef --discovery-token-ca-cert-hash sha256:777a25581324100f67719abcb972bab65dab126b64ba6a89f93c9e04dfaa0c4c
- 切回student，拷贝kubeadm 配置
student@ubuntu:/root$ mkdir ~/.kube
student@ubuntu:/root$ sudo cp /etc/kubernetes/admin.conf ~/.kube/config
student@ubuntu:/root$ sudo chown `id -u`:`id -g` -R ~/.kube/
student@ubuntu:/root$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
ubuntu NotReady master 3m34s v1.12.1
- 安装网络
student@ubuntu:~$ sudo cp /home/{rbac-kdd.yaml,calico.yaml} .
student@ubuntu:~$ kubectl create -f rbac-kdd.yaml
clusterrole.rbac.authorization.k8s.io/calico-node created
clusterrolebinding.rbac.authorization.k8s.io/calico-node created
student@ubuntu:~$ kubectl create -f calico.yaml
configmap/calico-config created
service/calico-typha created
deployment.apps/calico-typha created
poddisruptionbudget.policy/calico-typha created
daemonset.extensions/calico-node created
serviceaccount/calico-node created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
- 安装自动补全
student@ubuntu:~$ source <(kubectl completion bash)
安装集群worker节点
按上1-5步骤安装docker以及kubelet组件
加入集群
master查看token
student@ubuntu:/root$ kubeadm token list
TOKEN TTL EXPIRES USAGES DESCRIPTION EXTRA GROUPS
abcdef.0123456789abcdef 23h 2018-11-29T17:33:17+08:00 authentication,signing <none> system:bootstrappers:kubeadm:default-node-token
student@ubuntu:/root$ openssl x509 -pubkey \
> -in /etc/kubernetes/pki/ca.crt | openssl rsa \
> -pubin -outform der 2>/dev/null | openssl dgst \
> -sha256 -hex | sed 's/^.* //'
777a25581324100f67719abcb972bab65dab126b64ba6a89f93c9e04dfaa0c4c
worker节点加入
root@node-193:/etc/systemd/system/kubelet.service.d# kubeadm join --token abcdef.0123456789abcdef 172.30.81.194:6443 --discovery-token-ca-cert-hash sha256:777a25581324100f67719abcb972bab65dab126b64ba6a89f93c9e04dfaa0c4c
[preflight] running pre-flight checks
[WARNING RequiredIPVSKernelModulesAvailable]: the IPVS proxier will not be used, because the following required kernel modules are not loaded: [ip_vs ip_vs_rr ip_vs_wrr ip_vs_sh] or no builtin kernel ipvs support: map[ip_vs_rr:{} ip_vs_wrr:{} ip_vs_sh:{} nf_conntrack_ipv4:{} ip_vs:{}]
you can solve this problem with following methods:
1. Run 'modprobe -- ' to load missing kernel modules;
2. Provide the missing builtin kernel ipvs support
[WARNING Hostname]: hostname "node-193" could not be reached
[WARNING Hostname]: hostname "node-193" lookup node-193 on 114.114.114.114:53: read udp 172.30.81.193:42214->114.114.114.114:53: i/o timeout
[discovery] Trying to connect to API Server "172.30.81.194:6443"
[discovery] Created cluster-info discovery client, requesting info from "https://172.30.81.194:6443"
[discovery] Requesting info from "https://172.30.81.194:6443" again to validate TLS against the pinned public key
[discovery] Cluster info signature and contents are valid and TLS certificate validates against pinned roots, will use API Server "172.30.81.194:6443"
[discovery] Successfully established connection with API Server "172.30.81.194:6443"
[kubelet] Downloading configuration for the kubelet from the "kubelet-config-1.12" ConfigMap in the kube-system namespace
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[preflight] Activating the kubelet service
[tlsbootstrap] Waiting for the kubelet to perform the TLS Bootstrap...
[patchnode] Uploading the CRI Socket information "/var/run/dockershim.sock" to the Node API object "node-193" as an annotation
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the master to see this node join the cluster.
完成集群的安装
student@ubuntu:/root$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-193 Ready <none> 15h v1.12.1
ubuntu Ready master 16h v1.12.1
student@ubuntu:/root$ kubectl describe nodes ubuntu
Name: ubuntu
Roles: master
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/hostname=ubuntu
node-role.kubernetes.io/master=
Annotations: kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
node.alpha.kubernetes.io/ttl: 0
projectcalico.org/IPv4Address: 172.30.81.194/24
volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp: Wed, 28 Nov 2018 17:33:13 +0800
Taints: node-role.kubernetes.io/master:NoSchedule
Unschedulable: false
student@ubuntu:/root$ kubectl describe nodes |grep -i taint
Taints: <none>
Taints: node-role.kubernetes.io/master:NoSchedule
student@ubuntu:/root$ kubectl taint node --all node-role.kubernetes.io/master-
node/ubuntu untainted
error: taint "node-role.kubernetes.io/master:" not found
student@ubuntu:/root$ kubectl describe nodes |grep -i taint
Taints: <none>
Taints: <none>
student@ubuntu:/root$ kubectl get pod -n kube-system
NAME READY STATUS RESTARTS AGE
calico-node-l7nvf 2/2 Running 0 15h
calico-node-mvclt 2/2 Running 4 16h
coredns-6c66ffc55b-mhtnn 1/1 Running 0 15h
coredns-6c66ffc55b-qwv2m 1/1 Running 1 16h
etcd-ubuntu 1/1 Running 3 16h
kube-apiserver-ubuntu 1/1 Running 3 16h
kube-controller-manager-ubuntu 1/1 Running 3 16h
kube-proxy-82j77 1/1 Running 2 16h
kube-proxy-gczr5 1/1 Running 0 15h
kube-scheduler-ubuntu 1/1 Running 3 16h
student@ubuntu:/root$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 52:54:00:66:b5:34 brd ff:ff:ff:ff:ff:ff
inet 172.30.81.194/24 brd 172.30.81.255 scope global ens3
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe66:b534/64 scope link
valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:f4:ab:bb:40 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
5: cali92f306544c4@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1440 qdisc noqueue state UP group default
link/ether ee:ee:ee:ee:ee:ee brd ff:ff:ff:ff:ff:ff link-netnsid 1
inet6 fe80::ecee:eeff:feee:eeee/64 scope link
valid_lft forever preferred_lft forever
6: tunl0@NONE: <NOARP,UP,LOWER_UP> mtu 1440 qdisc noqueue state UNKNOWN group default qlen 1
link/ipip 0.0.0.0 brd 0.0.0.0
inet 192.168.0.1/32 brd 192.168.0.1 scope global tunl0
valid_lft forever preferred_lft forever
部署应用
student@ubuntu:/root$ kubectl create deployment nginx --image=nginx
deployment.apps/nginx created
student@ubuntu:/root$ kubectl describe deployments nginx
Name: nginx
Namespace: default
CreationTimestamp: Thu, 29 Nov 2018 10:22:56 +0800
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision: 1
Selector: app=nginx
Replicas: 1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
student@ubuntu:/root$ kubectl get events
LAST SEEN TYPE REASON KIND MESSAGE
106s Normal Scheduled Pod Successfully assigned default/nginx-55bd7c9fd-c92mc to node-193
105s Normal Pulling Pod pulling image "nginx"
91s Normal Pulled Pod Successfully pulled image "nginx"
90s Normal Created Pod Created container
90s Normal Started Pod Started container
106s Normal SuccessfulCreate ReplicaSet Created pod: nginx-55bd7c9fd-c92mc
106s Normal ScalingReplicaSet Deployment Scaled up replica set nginx-55bd7c9fd to 1
student@ubuntu:/root$ kubectl get deployments nginx -o yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "1"
creationTimestamp: 2018-11-29T02:22:56Z
generation: 1
labels:
app: nginx
name: nginx
namespace: default
resourceVersion: "76850"
selfLink: /apis/extensions/v1beta1/namespaces/default/deployments/nginx
uid: aebd982b-f37d-11e8-9608-52540066b534
spec:
progressDeadlineSeconds: 600
replicas: 1
revisionHistoryLimit: 10
selector:
matchLabels:
app: nginx
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
app: nginx
spec:
containers:
- image: nginx
imagePullPolicy: Always
name: nginx
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
terminationGracePeriodSeconds: 30
status:
availableReplicas: 1
conditions:
- lastTransitionTime: 2018-11-29T02:23:12Z
lastUpdateTime: 2018-11-29T02:23:12Z
message: Deployment has minimum availability.
reason: MinimumReplicasAvailable
status: "True"
type: Available
- lastTransitionTime: 2018-11-29T02:22:56Z
lastUpdateTime: 2018-11-29T02:23:12Z
message: ReplicaSet "nginx-55bd7c9fd" has successfully progressed.
reason: NewReplicaSetAvailable
status: "True"
type: Progressing
observedGeneration: 1
readyReplicas: 1
replicas: 1
updatedReplicas: 1
student@ubuntu:~$ kubectl get deployments nginx -o yaml > nginx-deploy.yaml
student@ubuntu:~$ kubectl delete deployments nginx
deployment.extensions "nginx" deleted
student@ubuntu:~$ kubectl create -f nginx-deploy.yaml
deployment.extensions/nginx created
student@ubuntu:~$ kubectl get deployments nginx -o yaml > second.yaml
student@ubuntu:~$ diff
diff diff3
student@ubuntu:~$ diff nginx-deploy.yaml second.yaml
6c6
< creationTimestamp: 2018-11-29T02:22:56Z
---
> creationTimestamp: 2018-11-29T02:27:40Z
12c12
< resourceVersion: "76850"
---
> resourceVersion: "77244"
14c14
< uid: aebd982b-f37d-11e8-9608-52540066b534
---
> uid: 57f13785-f37e-11e8-9608-52540066b534
48,49c48,49
< - lastTransitionTime: 2018-11-29T02:23:12Z
< lastUpdateTime: 2018-11-29T02:23:12Z
---
> - lastTransitionTime: 2018-11-29T02:27:55Z
> lastUpdateTime: 2018-11-29T02:27:55Z
54,55c54,55
< - lastTransitionTime: 2018-11-29T02:22:56Z
< lastUpdateTime: 2018-11-29T02:23:12Z
---
> - lastTransitionTime: 2018-11-29T02:27:40Z
> lastUpdateTime: 2018-11-29T02:27:55Z
student@ubuntu:~$ kubectl create deployment two --image=nginx --dry-run -o yaml
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: two
name: two
spec:
replicas: 1
selector:
matchLabels:
app: two
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: two
spec:
containers:
- image: nginx
name: nginx
resources: {}
status: {}
student@ubuntu:~$ kubectl get deployments nginx --export -o yaml > nginx-export.yaml
student@ubuntu:~$ kubectl delete deployments nginx
deployment.extensions "nginx" deleted
student@ubuntu:~$ kubectl create -f nginx-export.yaml
student@ubuntu:~$ kubectl get deployments nginx --export -o yaml > nginx-export-1.yaml
student@ubuntu:~$ diff nginx-export.yaml nginx-export-1.yaml
student@ubuntu:~$
student@ubuntu:~$ kubectl expose deployment nginx
error: couldn't find port via --port flag or introspection
See 'kubectl expose -h' for help and examples.
student@ubuntu:~$ kubectl delete deployments nginx
deployment.extensions "nginx" deleted
student@ubuntu:~$ vi nginx-export.yaml
containers:
- image: nginx
imagePullPolicy: Always
name: nginx
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
ports:
- containerPort: 80
protocol: TCP
student@ubuntu:~$ kubectl create -f nginx-export.yaml
deployment.extensions/nginx created
student@ubuntu:~$ kubectl expose deployment nginx
service/nginx exposed
student@ubuntu:~$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 17h
nginx ClusterIP 10.102.133.6 <none> 80/TCP 4s
student@ubuntu:~$ kubectl get ep nginx
NAME ENDPOINTS AGE
nginx 192.168.0.8:80 20s
student@ubuntu:~$ kubectl get deployments nginx
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 1 1 1 1 2m53s
student@ubuntu:~$ kubectl scale deployment nginx --replicas=3
deployment.extensions/nginx scaled
student@ubuntu:~$ kubectl get deployments nginx
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 3 3 3 2 3m11s
student@ubuntu:~$ kubectl get ep nginx
NAME ENDPOINTS AGE
nginx 192.168.0.8:80,192.168.1.5:80,192.168.1.6:80 105s
student@ubuntu:~$ kubectl get deployments.
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx 3 3 3 3 4m1s
student@ubuntu:~$ kubectl get po
NAME READY STATUS RESTARTS AGE
nginx-c5b5c6f7c-5lpxg 1/1 Running 0 4m4s
nginx-c5b5c6f7c-9pgxs 1/1 Running 0 60s
nginx-c5b5c6f7c-jmjx5 1/1 Running 0 60s
student@ubuntu:~$ kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE
nginx-c5b5c6f7c-5lpxg 1/1 Running 0 4m6s 192.168.0.8 ubuntu <none>
nginx-c5b5c6f7c-9pgxs 1/1 Running 0 62s 192.168.1.6 node-193 <none>
nginx-c5b5c6f7c-jmjx5 1/1 Running 0 62s 192.168.1.5 node-193 <none>
外部访问集群
student@ubuntu:~$ kubectl get po
NAME READY STATUS RESTARTS AGE
nginx-c5b5c6f7c-5lpxg 1/1 Running 0 5m33s
nginx-c5b5c6f7c-9pgxs 1/1 Running 0 2m29s
nginx-c5b5c6f7c-jmjx5 1/1 Running 0 2m29s
student@ubuntu:~$ kubectl exec nginx-c5b5c6f7c-5lpxg printenv
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=nginx-c5b5c6f7c-5lpxg
KUBERNETES_PORT=tcp://10.96.0.1:443
KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
KUBERNETES_PORT_443_TCP_PROTO=tcp
KUBERNETES_PORT_443_TCP_PORT=443
KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
KUBERNETES_SERVICE_HOST=10.96.0.1
KUBERNETES_SERVICE_PORT=443
KUBERNETES_SERVICE_PORT_HTTPS=443
NGINX_VERSION=1.15.7-1~stretch
NJS_VERSION=1.15.7.0.2.6-1~stretch
HOME=/root
student@ubuntu:~$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 17h
nginx ClusterIP 10.102.133.6 <none> 80/TCP 4m20s
student@ubuntu:~$ kubectl delete svc nginx
service "nginx" deleted
student@ubuntu:~$
student@ubuntu:~$ kubectl expose deployment nginx --type=NodePort
service/nginx exposed
student@ubuntu:~$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 17h
nginx NodePort 10.103.1.3 <none> 80:30732/TCP 9s
student@ubuntu:~$ curl 172.30.81.194:30732
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
student@ubuntu:~$ kubectl scale deployment nginx --replicas=0
deployment.extensions/nginx scaled
student@ubuntu:~$ kubectl get po
No resources found.
student@ubuntu:~$ kubectl delete deployments nginx
deployment.extensions "nginx" deleted
student@ubuntu:~$ kubectl delete ep nginx
endpoints "nginx" deleted
student@ubuntu:~$ kubectl delete svc nginx
service "nginx" deleted
