精华 k8s 入门安装配置并部署nginx
k8s 搭建
1，关闭 swap 内存 确保禁止掉swap分区
K8s的要求，在每个宿主机上执行：
sudo swapoff -a
#修改/etc/fstab，注释掉swap那行，持久化生效
sudo vi /etc/fstab
安装Docker
apt update && apt install docker.io && systemctl start docker && systemctl enable docker
sudo apt-get update && sudo apt-get install -y ca-certificates curl software-properties-common apt-transport-https curl
curl -s https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | sudo apt-key add -
sudo tee /etc/apt/sources.list.d/kubernetes.list <<EOF
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF
安装Kubelet kubeadm kubectl
apt-get update && apt-get install -y kubelet kubeadm kubectl
# 它是用来锁住这几个apt包的更新的，如果一旦手误更新了这些包，K8s集群就会因为版本不兼容挂了：
apt-mark hold kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet
设置主机hostname
hostnamectl set-hostname k8s-master
hostnamectl set-hostname k8s-node1
hostnamectl set-hostname k8s-node2
hostnamectl set-hostname k8s-node3
vi /etc/hosts
service-cidr和pod-network-cidr介绍
在用kubadm安装k8s时出现一个疑问，service-cidr和pod-network-cidr这个地址如何配置
参数说明
-
--apiserver-advertise-address=192.168.181.131 这个参数就是master主机的IP地址，例如我的Master主机的IP是：192.168.181.131
-
--image-repository=registry.aliyuncs.com/google_containers 这个是镜像地址，由于国外地址无法访问，故使用的阿里云仓库地址：registry.aliyuncs.com/google_containers
-
--kubernetes-version=v1.17.4 这个参数是下载的k8s软件版本号
-
-service-cidr=10.96.0.0/12 这个参数后的IP地址直接就套用10.96.0.0/12 ,以后安装时也套用即可，不要更改
-
--pod-network-cidr=10.244.0.0/16 k8s内部的pod节点之间网络可以使用的IP段，不能和service-cidr写一样，如果不知道怎么配，就先用这个10.244.0.0/16
service-cidr 的选取不能和PodCIDR及本机网络有重叠或者冲突。 一般可以选择一个本机网络和PodCIDR都没有用到的私网地址段，比如PODCIDR使用192.168.0.1/16, 那么service cidr可以选择172.16.0.1/20. 主机网段可以选10.1.0.1/8. 三者之间网络无重叠冲突即可。
Docker 和 kubelet 驱动不一致处理：https://www.cnblogs.com/hongdada/p/9771857.html
Kubernetes 升级至 1.24 后集群无法启动 https://javamana.com/2021/08/20210823074624225Y.html
# 报错 docker 驱动 跟 kubelet 驱动不一致 解决方案；
# kubelet cgroup driver: \"systemd\" is different from docker cgroup driver
sudo docker info|grep Cgroup
journalctl -f -u kubelet
初始化k8s 集群
kubeadm reset && kubeadm init \
--image-repository registry.cn-hangzhou.aliyuncs.com/google_containers \
--kubernetes-version=v1.22.2 \
--pod-network-cidr=192.168.3.0/8 \
--service-cidr=10.96.0.0/16 \
--apiserver-advertise-address=192.168.2.129 \
--v=6
# 查看节点状态
kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master NotReady control-plane,master 10m v1.22.2
# 注意复制下下列两项内容：
sudo mkdir -p $HOME/.kube && sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config && sudo chown $(id -u):$(id -g) $HOME/.kube/config
kubeadm join 10.206.0.6:6443 --token jgzjsx.rpgeo2xsi4g88qvv --discovery-token-ca-cert-hash sha256:7c02cc3d7a3a4d881101129087a41876bd0dd3135e261b7624fc70f655db78a4
安装CNI
https://docs.projectcalico.org/getting-started/kubernetes/self-managed-onprem/onpremises
installing a pod network add-on
下面就是要安装Container Network Interface(CNI),这是必须的，不然Master Node 会处于NotReady状态，无法部署任何应用。也就是要先安装CNI才能部署pod.
kubectl apply -f https://docs.projectcalico.org/v3.9/manifests/calico.yaml
各个节点加入Master：
kubeadm join 10.206.0.6:6443 --token z8b9l2.9etm9mskhzzrlfya \
--discovery-token-ca-cert-hash sha256:2c07adb82773e53e0fc243cda29b165666c25d8cf4255eab7009d2c625bc3603
查看各节点状态
root@k8s-master:/home/timeless# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready control-plane,master 42m v1.22.2
k8s-node1 Ready <none> 39m v1.22.2
k8s-node2 Ready <none> 39m v1.22.2
k8s-node3 Ready <none> 39m v1.22.2
查看 namesace pod 系统应用 日志
kubectl -n kube-system logs calico-node-2wkzd
部署 nginx 服务
1、创建nginx-rc.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: nginx-controller
spec:
replicas: 2
selector:
name: nginx
template:
metadata:
labels:
name: nginx
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
2、创建 nginx-service-nodeport.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-service-nodeport
spec:
ports:
- port: 8000
targetPort: 80
protocol: TCP
type: NodePort
selector:
name: nginx
3、创建pod
kubectl create -f nginx-rc.yaml
4、创建service
kubectl create -f nginx-service-nodeport.yaml
5、查看pod
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-controller-7kt4z 0/1 ContainerCreating 0 18s
nginx-controller-wllwc 0/1 ContainerCreating 0 18s
pull image failed
root@k8s-master:/home/timeless# kubectl get pod
NAME READY STATUS RESTARTS AGE
nginx-controller-cttqr 0/1 ImagePullBackOff 0 4m1s
nginx-controller-z69jv 0/1 ImagePullBackOff 0 4m1s
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-controller-7kt4z 1/1 Running 1 1h
nginx-controller-wllwc 1/1 Running 1 1h
查看 pod 的共享命名空间的IP
root@k8s-master:/home/timeless# kubectl get pod nginx-deployment-748755bf57-778d2 --template={{.status.podIP}}
192.109.131.23
每个node 节点都可访问 每一个Pod 都拥有一个扁平化的共享空间IP
root@k8s-master:/home/timeless# curl 192.109.131.23
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
''''''''
</html>
查看集群节点状态：
# 查看集群状态
kubectl get cs
Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused
自學k8s-kubeadm部署過程中遇到的dial tcp 127.0.0.1:10251: connect: connection refused錯誤
查看nginx 状态：
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 135m
nginx-service-nodeport NodePort 10.96.132.209 <none> 8000:31857/TCP 36m
kubectl rc 扩缩容：
root@VM-0-6-ubuntu:/home/ubuntu# kubectl scale rc nginx-controller --replicas=5
replicationcontroller/nginx-controller scaled
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get svc,pod,node
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 20h
service/nginx-service-nodeport NodePort 10.96.132.209 <none> 8000:31857/TCP 18h
NAME READY STATUS RESTARTS AGE
pod/nginx-controller-9n5k6 1/1 Running 0 3m53s
pod/nginx-controller-dqvnf 1/1 Running 0 3m53s
pod/nginx-controller-qrnwc 1/1 Running 0 3m53s
pod/nginx-controller-w4wnh 1/1 Running 0 18h
pod/nginx-controller-wlngk 1/1 Running 0 18h
NAME STATUS ROLES AGE VERSION
node/vm-0-6-ubuntu Ready control-plane,master 20h v1.22.2
node/vm-0-9-ubuntu Ready <none> 20h v1.22.2
查看集群详细信息
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-controller-9n5k6 1/1 Running 0 23h 192.168.202.4 vm-0-9-ubuntu <none> <none>
nginx-controller-dqvnf 1/1 Running 0 23h 192.168.202.5 vm-0-9-ubuntu <none> <none>
nginx-controller-qrnwc 1/1 Running 0 23h 192.168.202.6 vm-0-9-ubuntu <none> <none>
nginx-controller-w4wnh 1/1 Running 0 41h 192.168.202.3 vm-0-9-ubuntu <none> <none>
nginx-controller-wlngk 1/1 Running 0 41h 192.168.202.2 vm-0-9-ubuntu <none> <none>
查看pod 的 label
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-controller-9n5k6 1/1 Running 0 27h name=nginx
nginx-controller-dqvnf 1/1 Running 0 27h name=nginx
nginx-controller-qrnwc 1/1 Running 0 27h name=nginx
nginx-controller-w4wnh 1/1 Running 0 46h name=nginx
nginx-controller-wlngk 1/1 Running 0 46h name=nginx
根据label 查找 Pod
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pod -l name=nginx
NAME READY STATUS RESTARTS AGE
nginx-controller-9n5k6 1/1 Running 0 27h
nginx-controller-dqvnf 1/1 Running 0 27h
nginx-controller-qrnwc 1/1 Running 0 27h
nginx-controller-w4wnh 1/1 Running 0 46h
nginx-controller-wlngk 1/1 Running 0 46h
创建deployment
查看 deployment yaml语法格式
root@VM-0-6-ubuntu:/home/ubuntu# kubectl explain deployment.apiVersion
KIND: Deployment
VERSION: apps/v1
FIELD: apiVersion <string>
DESCRIPTION:
APIVersion defines the versioned schema of this representation of an
object. Servers should convert recognized schemas to the latest internal
value, and may reject unrecognized values. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
root@VM-0-6-ubuntu:/home/ubuntu# vi nginx-deployment.yaml
root@VM-0-6-ubuntu:/home/ubuntu# kubectl explain deployment.apiVersion
KIND: Deployment
VERSION: apps/v1
FIELD: apiVersion <string>
DESCRIPTION:
APIVersion defines the versioned schema of this representation of an
object. Servers should convert recognized schemas to the latest internal
value, and may reject unrecognized values. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
创建deployment:
#test-pod
apiVersion: v1 #指定api版本，此值必须在kubectl apiversion中
kind: Pod #指定创建资源的角色/类型
metadata: #资源的元数据/属性
name: test-pod #资源的名字，在同一个namespace中必须唯一
labels: #设定资源的标签
k8s-app: apache
version: v1
kubernetes.io/cluster-service: "true"
annotations: #自定义注解列表
- name: String #自定义注解名字
spec: #specification of the resource content 指定该资源的内容
restartPolicy: Always #表明该容器一直运行，默认k8s的策略，在此容器退出后，会立即创建一个相同的容器
nodeSelector: #节点选择，先给主机打标签kubectl label nodes kube-node1 zone=node1
zone: node1
containers:
- name: test-pod #容器的名字
image: 10.192.21.18:5000/test/chat:latest #容器使用的镜像地址
imagePullPolicy: Never #三个选择Always、Never、IfNotPresent，每次启动时检查和更新（从registery）images的策略，
# Always，每次都检查
# Never，每次都不检查（不管本地是否有）
# IfNotPresent，如果本地有就不检查，如果没有就拉取
command: ['sh'] #启动容器的运行命令，将覆盖容器中的Entrypoint,对应Dockefile中的ENTRYPOINT
args: ["$(str)"] #启动容器的命令参数，对应Dockerfile中CMD参数
env: #指定容器中的环境变量
- name: str #变量的名字
value: "/etc/run.sh" #变量的值
resources: #资源管理
requests: #容器运行时，最低资源需求，也就是说最少需要多少资源容器才能正常运行
cpu: 0.1 #CPU资源（核数），两种方式，浮点数或者是整数+m，0.1=100m，最少值为0.001核（1m）
memory: 32Mi #内存使用量
limits: #资源限制
cpu: 0.5
memory: 1000Mi
ports:
- containerPort: 80 #容器开发对外的端口
name: httpd #名称
protocol: TCP
livenessProbe: #pod内容器健康检查的设置
httpGet: #通过httpget检查健康，返回200-399之间，则认为容器正常
path: / #URI地址
port: 80
#host: 127.0.0.1 #主机地址
scheme: HTTP
initialDelaySeconds: 180 #表明第一次检测在容器启动后多长时间后开始
timeoutSeconds: 5 #检测的超时时间
periodSeconds: 15 #检查间隔时间
#也可以用这种方法
#exec: 执行命令的方法进行监测，如果其退出码不为0，则认为容器正常
# command:
# - cat
# - /tmp/health
#也可以用这种方法
#tcpSocket: //通过tcpSocket检查健康
# port: number
lifecycle: #生命周期管理
postStart: #容器运行之前运行的任务
exec:
command:
- 'sh'
- 'yum upgrade -y'
preStop:#容器关闭之前运行的任务
exec:
command: ['service httpd stop']
volumeMounts: #挂载持久存储卷
- name: volume #挂载设备的名字，与volumes[*].name 需要对应
mountPath: /data #挂载到容器的某个路径下
readOnly: True
volumes: #定义一组挂载设备
- name: volume #定义一个挂载设备的名字
#meptyDir: {}
hostPath:
path: /opt #挂载设备类型为hostPath，路径为宿主机下的/opt,这里设备类型支持很多种
#nfs
创建一个yaml文件
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.10
ports:
- containerPort: 80
执行创建deployment
root@VM-0-6-ubuntu:/home/ubuntu# kubectl create -f nginx-deployment.yaml
deployment.apps "nginx-deployment" created
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get deployment
查看pod 标签：
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
nginx-controller-9n5k6 1/1 Running 0 28h name=nginx
nginx-controller-dqvnf 1/1 Running 0 28h name=nginx
nginx-controller-qrnwc 1/1 Running 0 28h name=nginx
nginx-controller-w4wnh 1/1 Running 0 46h name=nginx
nginx-controller-wlngk 1/1 Running 0 46h name=nginx
nginx-deployment-897f8f586-htc7n 1/1 Running 0 21m app=nginx,pod-template-hash=897f8f586
nginx-deployment-897f8f586-lt5zr 1/1 Running 0 21m app=nginx,pod-template-hash=897f8f586
nginx-deployment-897f8f586-p2npp 1/1 Running 0 21m app=nginx,pod-template-hash=897f8f586
通过标签查找 Pod
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pod -l app=nginx
NAME READY STATUS RESTARTS AGE
nginx-deployment-897f8f586-htc7n 1/1 Running 0 23m
nginx-deployment-897f8f586-lt5zr 1/1 Running 0 23m
nginx-deployment-897f8f586-p2npp 1/1 Running 0 24m
查看 deployment 创建过程：
Deployment 管理的是replicaset-controller，RC会创建Pod。Pod自身会下载镜像并启动镜像
root@VM-0-6-ubuntu:/home/ubuntu# kubectl describe rs nginx-deployment
Name: nginx-deployment-748755bf57
Namespace: default
Selector: app=nginx,pod-template-hash=748755bf57
Labels: app=nginx
pod-template-hash=748755bf57
Annotations: deployment.kubernetes.io/desired-replicas: 3
deployment.kubernetes.io/max-replicas: 4
deployment.kubernetes.io/revision: 1
Controlled By: Deployment/nginx-deployment
Replicas: 0 current / 0 desired
Pods Status: 0 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
Labels: app=nginx
pod-template-hash=748755bf57
Containers:
nginx:
Image: nginx:1.10
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Events: <none>
Name: nginx-deployment-897f8f586
Namespace: default
Selector: app=nginx,pod-template-hash=897f8f586
Labels: app=nginx
pod-template-hash=897f8f586
Annotations: deployment.kubernetes.io/desired-replicas: 3
deployment.kubernetes.io/max-replicas: 4
deployment.kubernetes.io/revision: 2
Controlled By: Deployment/nginx-deployment
Replicas: 3 current / 3 desired
Pods Status: 3 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
Labels: app=nginx
pod-template-hash=897f8f586
Containers:
nginx:
Image: nginx:1.11
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Events: <none>
升级nginx镜像
root@VM-0-6-ubuntu:/home/ubuntu# kubectl set image deploy/nginx-deployment nginx=nginx:1.11
deployment.apps "nginx-deployment" image updated
root@VM-0-6-ubuntu:/home/ubuntu# kubectl exec -it nginx-deployment-897f8f586-htc7n bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@nginx-deployment-897f8f586-htc7n:/# nginx -v
nginx version: nginx/1.11.13
ctrl+ D 退出
升级镜像的过程是逐步进行的，pod不会一下子全部关闭，而是一个一个升级
查看发布过程
root@nginx-deployment-897f8f586-htc7n:/# kubectl rollout status deploy/nginx-deployment
deployment "nginx-deployment" successfully rolled out
查看Deployment 历史版本
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout history deploy/nginx-deployment
deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
1 <none>
2 <none>
# 显示历史有两个版本 查看两个版本
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout history deploy/nginx-deployment --revision=1
deployment.apps/nginx-deployment with revision #1
Pod Template:
Labels: app=nginx
pod-template-hash=748755bf57
Containers:
nginx:
Image: nginx:1.10
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout history deploy/nginx-deployment --revision=2
deployment.apps/nginx-deployment with revision #2
Pod Template:
Labels: app=nginx
pod-template-hash=897f8f586
Containers:
nginx:
Image: nginx:1.11
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
编辑deployment
修改nginx 版本为 1.12
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "2"
creationTimestamp: "2021-10-19T07:08:12Z"
generation: 2
name: nginx-deployment
namespace: default
resourceVersion: "226930"
uid: 008b5b22-ceeb-454d-bed3-d3bd7f17476d
spec:
progressDeadlineSeconds: 600
replicas: 3
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:1.12
imagePullPolicy: IfNotPresent
name: nginx
ports:
- containerPort: 80
protocol: TCP
resources: {}
查看升级过程
root@VM-0-6-ubuntu:/home/ubuntu# kubectl edit deploy/nginx-deployment
deployment.apps/nginx-deployment edited
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout status deploy/nginx-deployment
deployment "nginx-deployment" successfully rolled out
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout history deploy/nginx-deployment
deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
1 <none>
2 <none>
3 <none>
root@VM-0-6-ubuntu:/home/ubuntu# kubectl exec -it nginx-deployment-f77774fc5-2b7f9 bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@nginx-deployment-f77774fc5-2b7f9:/# nginx -v
nginx version: nginx/1.12.2
扩容/缩容（指定--replicas的数量）
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pod -l app=nginx
NAME READY STATUS RESTARTS AGE
nginx-deployment-f77774fc5-2b7f9 1/1 Running 0 6m38s
nginx-deployment-f77774fc5-hh8kj 1/1 Running 0 6m59s
nginx-deployment-f77774fc5-xmzrk 1/1 Running 0 6m36s
root@VM-0-6-ubuntu:/home/ubuntu# kubectl scale deploy/nginx-deployment --replicas=5
deployment.apps/nginx-deployment scaled
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout status deploy/nginx-deployment
deployment "nginx-deployment" successfully rolled out
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get pod -l app=nginx
NAME READY STATUS RESTARTS AGE
nginx-deployment-f77774fc5-26nm6 1/1 Running 0 19s
nginx-deployment-f77774fc5-2b7f9 1/1 Running 0 7m41s
nginx-deployment-f77774fc5-hh8kj 1/1 Running 0 8m2s
nginx-deployment-f77774fc5-hklrh 1/1 Running 0 19s
nginx-deployment-f77774fc5-xmzrk 1/1 Running 0 7m39s
创建Service 提供对外访问接口
apiVersion: v1
kind: Service
metadata:
name: nginx-service
labels:
app: nginx
spec:
ports:
- port: 88
targetPort: 80
selector:
app: nginx
####
apiVersion: 指定版本
kind: 类型
name: 指定服务名称
labels: 标签
port: Service 服务暴露的端口
targetPort: 容器暴露的端口
seletor: 关联的Pod的标签
创建service
root@VM-0-6-ubuntu:/home/ubuntu# kubectl create -f nginx-service.yaml
service/nginx-service created
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get svc/nginx-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx-service ClusterIP 10.96.36.156 <none> 88/TCP 16s
查看service
访问nginx 服务，访问Pod是有负载均衡的
root@VM-0-6-ubuntu:/home/ubuntu# kubectl get svc/nginx-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx-service ClusterIP 10.96.36.156 <none> 88/TCP 64s
root@VM-0-6-ubuntu:/home/ubuntu# curl 10.96.36.156:88
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
对service的描述
root@VM-0-6-ubuntu:/home/ubuntu# kubectl describe svc/nginx-service
Name: nginx-service
Namespace: default
Labels: app=nginx
Annotations: <none>
Selector: app=nginx
Type: ClusterIP
IP Family Policy: SingleStack
IP Families: IPv4
IP: 10.96.36.156
IPs: 10.96.36.156
Port: <unset> 88/TCP
TargetPort: 80/TCP
Endpoints: 192.168.202.13:80,192.168.202.14:80,192.168.202.15:80 + 2 more...
Session Affinity: None
Events: <none>
进入容器查看：
root@VM-0-6-ubuntu:/home/ubuntu# kubectl exec nginx-deployment-897f8f586-htc7n -it bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@nginx-deployment-897f8f586-htc7n:/# nginx -v
nginx version: nginx/1.11.13
回滚到之前的版本：
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout history deploy/nginx-deployment
deployment.apps/nginx-deployment
REVISION CHANGE-CAUSE
1 <none>
2 <none>
3 <none>
查看前一个版本 版本 和 配置
kubectl rollout history --help
View previous rollout revisions and configurations.
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout history deploy/nginx-deployment --revision=3
deployment.apps/nginx-deployment with revision #3
Pod Template:
Labels: app=nginx
pod-template-hash=f77774fc5
Containers:
nginx:
Image: nginx:1.12
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
回滚到上个版本：
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout undo deploy/nginx-deployment
deployment.apps/nginx-deployment rolled back
root@VM-0-6-ubuntu:/home/ubuntu# kubectl describe deploy/nginx-deployment
Name: nginx-deployment
Namespace: default
CreationTimestamp: Tue, 19 Oct 2021 15:08:12 +0800
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 4
Selector: app=nginx
Replicas: 5 desired | 5 updated | 5 total | 5 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.11
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: nginx-deployment-897f8f586 (5/5 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 42m deployment-controller Scaled up replica set nginx-deployment-f77774fc5 to 1
Normal ScalingReplicaSet 42m deployment-controller Scaled down replica set nginx-deployment-897f8f586 to 2
Normal ScalingReplicaSet 42m deployment-controller Scaled up replica set nginx-deployment-f77774fc5 to 2
Normal ScalingReplicaSet 42m deployment-controller Scaled up replica set nginx-deployment-f77774fc5 to 3
Normal ScalingReplicaSet 42m deployment-controller Scaled down replica set nginx-deployment-897f8f586 to 1
Normal ScalingReplicaSet 42m deployment-controller Scaled down replica set nginx-deployment-897f8f586 to 0
Normal ScalingReplicaSet 35m deployment-controller Scaled up replica set nginx-deployment-f77774fc5 to 5
Normal ScalingReplicaSet 80s deployment-controller Scaled down replica set nginx-deployment-f77774fc5 to 4
Normal ScalingReplicaSet 80s (x2 over 118m) deployment-controller Scaled up replica set nginx-deployment-897f8f586 to 3
Normal ScalingReplicaSet 80s (x2 over 118m) deployment-controller Scaled up replica set nginx-deployment-897f8f586 to 2
Normal ScalingReplicaSet 78s deployment-controller Scaled down replica set nginx-deployment-f77774fc5 to 3
Normal ScalingReplicaSet 78s deployment-controller Scaled up replica set nginx-deployment-897f8f586 to 4
Normal ScalingReplicaSet 78s deployment-controller Scaled down replica set nginx-deployment-f77774fc5 to 2
Normal ScalingReplicaSet 78s deployment-controller Scaled up replica set nginx-deployment-897f8f586 to 5
Normal ScalingReplicaSet 78s deployment-controller Scaled down replica set nginx-deployment-f77774fc5 to 1
Normal ScalingReplicaSet 74s deployment-controller Scaled down replica set nginx-deployment-f77774fc5 to 0
回滚到指定版本：
root@VM-0-6-ubuntu:/home/ubuntu# kubectl rollout undo deploy/nginx-deployment --to-revision=1
deployment.apps/nginx-deployment rolled back
root@VM-0-6-ubuntu:/home/ubuntu# kubectl describe deploy/nginx-deployment
Name: nginx-deployment
Namespace: default
CreationTimestamp: Tue, 19 Oct 2021 15:08:12 +0800
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 5
Selector: app=nginx
Replicas: 5 desired | 5 updated | 6 total | 4 available | 2 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.10
参考文档：
https://zhuanlan.zhihu.com/p/138554103
https://www.cnblogs.com/fisherbook/p/14277388.html
kubeadm创建集群 https://blog.csdn.net/qq_44851613/article/details/120589180
https://www.jianshu.com/p/f2d4dd4d1fb1
https://www.m690.com/archives/1160/
Docker中的Cgroup Driver:Cgroupfs 与 Systemd
官方文档：
https://kubernetes.io/zh/docs/reference/command-line-tools-reference/kubelet/
较好文档：
https://blog.51cto.com/u_13760351/2504882
kubectl get 报错：possibly because of "crypto/rsa: verification error" wkubernetes"
没有无缘无故的荣耀
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赞助我写出更好的博客
