目录
Kubernetes之（五）快速部署应用
kubectl命令介绍
[root@master ~]# kubectl --help
kubectl controls the Kubernetes cluster manager.
Find more information at: https://kubernetes.io/docs/reference/kubectl/overview/
Basic Commands (Beginner):
create Create a resource from a file or from stdin.
expose 使用 replication controller, service, deployment 或者 pod 并暴露它作为一个 新的 Kubernetes Service
run 在集群中运行一个指定的镜像
set 为 objects 设置一个指定的特征
Basic Commands (Intermediate):
explain 查看资源的文档
get 显示一个或更多 resources
edit 在服务器上编辑一个资源
delete Delete resources by filenames, stdin,resources and names, or
by resources and label selector
Deploy Commands:
rollout Manage the rollout of a resource
scale 为 Deployment, ReplicaSet, Replication Controller 或者 Job设置一个新的副本数量
autoscale 自动调整一个 Deployment, ReplicaSet, 或者ReplicationController 的副本数量
Cluster Management Commands:
certificate 修改 certificate 资源.
cluster-info 显示集群信息
top Display Resource (CPU/Memory/Storage) usage.
cordon 标记 node 为 unschedulable
uncordon 标记 node 为 schedulable
drain Drain node in preparation for maintenance
taint 更新一个或者多个 node 上的 taints
Troubleshooting and Debugging Commands:
describe 显示一个指定 resource 或者 group 的 resources 详情
logs 输出容器在 pod 中的日志
attach Attach 到一个运行中的 container
exec 在一个 container 中执行一个命令
port-forward Forward one or more local ports to a pod
proxy 运行一个 proxy 到 Kubernetes API server
cp 复制 files 和 directories 到 containers
和从容器中复制 files 和 directories.
auth Inspect authorization
Advanced Commands:
diff Diff live version against would-be applied version
apply 通过文件名或标准输入流(stdin)对资源进行配置
patch 使用 strategic merge patch 更新一个资源的 field(s)
replace 通过 filename 或者 stdin替换一个资源
wait Experimental: Wait for a specific condition on one or many
resources.
convert 在不同的 API versions 转换配置文件
Settings Commands:
label 更新在这个资源上的 labels
annotate 更新一个资源的注解
completion Output shell completion code for the specified shell (bash or
zsh)
Other Commands:
api-resources Print the supported API resources on the server
api-versions Print the supported API versions on the server, in the form of"group/version"
config 修改 kubeconfig 文件
plugin Provides utilities for interacting with plugins.
version 输出 client 和 server 的版本信息
Usage:
kubectl [flags] [options]
Use "kubectl <command> --help" for more information about a given command.
Use "kubectl options" for a list of global command-line options (applies to all
commands).
kubectl run命令行部署应用
语法：
Usage:
kubectl run NAME --image=image [--env="key=value"] [--port=port]
[--replicas=replicas] [--dry-run=bool] [--overrides=inline-json] [--command] --
[COMMAND] [args...] [options]
举例
[root@master ~]# kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=1 --dry-run=true
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/nginx-deploy created (dry run)
#--image 指定镜像
#--port 暴漏端口
#--replicas 设置副本数量
# --dry-run=true 干跑模式，不执行，类似验证，无问题后再执行
[root@master ~]# kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=1
deployment.apps/nginx-deploy created
## 查看是否创建成功
#查看deployment
[root@master ~]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
nginx-deploy 1/1 1 1 30s
#查看pod
[root@master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-deploy-84cbfc56b6-st4tq 1/1 Running 0 72s
# -o wide 显示更多详细信息
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-deploy-84cbfc56b6-st4tq 1/1 Running 0 98s 10.244.2.2 node02 <none> <none>
从上面创建的应用可以得知，nginx-deploy应用的pod的ip为10.244.2.2，这是一个pod ip，仅仅可以在集群内部访问，如下：
[root@master ~]# curl -I 10.244.2.2
HTTP/1.1 200 OK
Server: nginx/1.14.2
Date: Thu, 28 Mar 2019 02:23:42 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Fri, 08 Mar 2019 03:09:00 GMT
Connection: keep-alive
ETag: "5c81dccc-264"
Accept-Ranges: bytes
[root@node01 ~]# curl -I 10.244.2.2
HTTP/1.1 200 OK
Server: nginx/1.14.2
Date: Thu, 28 Mar 2019 02:23:48 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Fri, 08 Mar 2019 03:09:00 GMT
Connection: keep-alive
ETag: "5c81dccc-264"
Accept-Ranges: bytes
[root@node02 ~]# curl -I 10.244.2.2
HTTP/1.1 200 OK
Server: nginx/1.14.2
Date: Thu, 28 Mar 2019 02:23:46 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Fri, 08 Mar 2019 03:09:00 GMT
Connection: keep-alive
ETag: "5c81dccc-264"
Accept-Ranges: bytes
尝试删除Pod
[root@master ~]# kubectl delete pods nginx-deploy-84cbfc56b6-st4tq
pod "nginx-deploy-84cbfc56b6-st4tq" deleted
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-deploy-84cbfc56b6-w66pw 1/1 Running 0 53s 10.244.2.3 node02 <none> <none>
可以看到删除Pod后又重新开起了一个Pod，因为pod是被控制器管理的（此处为deployment），当Pod数量不满足控制器的desired值得时候，会自动补全Pod（随机在集群内满足要求得node节点创建），来满足期望值，同样的如果过多也会关掉多余得Pod。
此时Pod得IP已经发生变化，所以如果需要被外部访问就需要提供一个固定得端点，就是接下来说得Service：
kubectl expose 通过service暴漏Pod
语法
Usage:
kubectl expose (-f FILENAME | TYPE NAME) [--port=port] [--protocol=TCP|UDP|SCTP] [--target-port=number-or-name]
[--name=name] [--external-ip=external-ip-of-service] [--type=type] [options]
#--port=port 这里是服务端口
#--target-port 容器端口
#--type=type service类型，分为Custer IP ，NodePort，LoadBalancer，ExternalName，默认是Custer IP
后面会详细讲解
举例
#将name为nginx-deploy的deployment暴漏为80端口
[root@master ~]# kubectl expose deployment nginx-deploy --name=nginx --port=80 --target-port=80 --protocol=TCP
service/nginx-deploy exposed
#查看服务 services 简写为svc
[root@master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 18h
nginx ClusterIP 10.98.2.12 <none> 80/TCP 3s 35s
此时在节点访问svc的80端口来访问pod，即使Pod被删除后重建也可以访问
#Pod在node02上，次数使用node01来访问
[root@node01 ~]# curl -I 10.98.2.12
HTTP/1.1 200 OK
Server: nginx/1.14.2
Date: Thu, 28 Mar 2019 02:48:13 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Fri, 08 Mar 2019 03:09:00 GMT
Connection: keep-alive
ETag: "5c81dccc-264"
Accept-Ranges: bytes
#删除Pod后再次尝试
[root@master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-deploy-84cbfc56b6-w66pw 1/1 Running 0 20m
[root@master ~]# kubectl delete pods nginx-deploy-84cbfc56b6-w66pw
pod "nginx-deploy-84cbfc56b6-w66pw" deleted
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-deploy-84cbfc56b6-tcssz 1/1 Running 0 6s 10.244.2.4 node02 <none> <none>
[root@node01 ~]# curl -I 10.98.2.12
HTTP/1.1 200 OK
Server: nginx/1.14.2
Date: Thu, 28 Mar 2019 02:49:35 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Fri, 08 Mar 2019 03:09:00 GMT
Connection: keep-alive
ETag: "5c81dccc-264"
Accept-Ranges: bytes
10.99.146.96这网段依然是集群内部的网段，只能被集群内部客户端访问，外部是无法通过service的ip进行访问。那么针对pod的客户端除了通过service ip访问还可以通过service的名称进行访问，但是前提是需要对service的名称能够进行解析。而解析时是依赖coredns服务的，而我们本地的dns指向并非coredns，如下：
[root@node02 ~]# curl -I nginx
curl: (6) Could not resolve host: nginx-deploy; 未知的错误
#查看节点的dns地址
[root@node02 ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 114.114.114.114
nameserver 10.0.0.2
查看coredns的IP地址
[root@master ~]# kubectl get pods -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
coredns-78d4cf999f-6cb69 1/1 Running 0 18h 10.244.1.2 node01 <none> <none>
coredns-78d4cf999f-tflpn 1/1 Running 0 18h 10.244.1.3 node01 <none> <none>
etcd-master 1/1 Running 0 18h 10.0.0.10 master <none> <none>
kube-apiserver-master 1/1 Running 0 18h 10.0.0.10 master <none> <none>
kube-controller-manager-master 1/1 Running 0 18h 10.0.0.10 master <none> <none>
kube-flannel-ds-amd64-gtv85 1/1 Running 0 18h 10.0.0.10 master <none> <none>
kube-flannel-ds-amd64-gwbql 1/1 Running 1 18h 10.0.0.12 node02 <none> <none>
kube-flannel-ds-amd64-ml7nf 1/1 Running 0 18h 10.0.0.11 node01 <none> <none>
kube-proxy-ch4vp 1/1 Running 0 18h 10.0.0.11 node01 <none> <none>
kube-proxy-cz2rf 1/1 Running 1 18h 10.0.0.12 node02 <none> <none>
kube-proxy-kdp7d 1/1 Running 0 18h 10.0.0.10 master <none> <none>
kube-scheduler-master 1/1 Running 0 18h 10.0.0.10 master <none> <none>
#-n指定名称空间
正常来说，也不会直接访问coredns的Pod的IP来直接访问，也是通过coredns的service进行访问
[root@master ~]# kubectl get svc -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP 18h
可以通过这个service ip：10.96.0.10进行解析上面的nginx服务。
提前准备dig命令 yum install -y bind-utils,这里需要使用完整的服务名称，否则可能由于dns搜索域问题导致失败
[root@master ~]# dig -t A nginx.default.svc.cluster.local @10.96.0.10
; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> -t A nginx.default.svc.cluster.local @10.96.0.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58335
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;nginx.default.svc.cluster.local. IN A
;; ANSWER SECTION:
nginx.default.svc.cluster.local. 5 IN A 10.98.2.12
;; Query time: 1 msec
;; SERVER: 10.96.0.10#53(10.96.0.10)
;; WHEN: 四 3月 28 11:02:11 CST 2019
;; MSG SIZE rcvd: 96
尝试通过集群内pod客户端进行访问：
[root@master ~]# kubectl run client --image=busybox --replicas=1 -it --restart=Never
If you don't see a command prompt, try pressing enter.
/ # cat /etc/resolv.conf
nameserver 10.96.0.10
search default.svc.cluster.local svc.cluster.local cluster.local
options ndots:5
/ # wget -O - -q http://nginx:80
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
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>
此时name为nginx的service就为name为nginx-deploy的deployment提供了固定访问断电，无论deployment内Pod的增加删除，都不影响访问，使用命令来查看services的详细信息：
[root@master ~]# kubectl describe svc nginx
Name: nginx
Namespace: default
Labels: run=nginx-deploy
Annotations: <none>
Selector: run=nginx-deploy
Type: ClusterIP
IP: 10.98.2.12
Port: <unset> 80/TCP
TargetPort: 80/TCP
Endpoints: 10.244.2.4:80
Session Affinity: None
Events: <none>
#Endpoints: Pod的IP地址
无论Pod怎么增删，只要标Labels存在run=nginx-deploy的 就会被svc锁访问。
[root@master ~]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
client 1/1 Running 0 28m run=client
nginx-deploy-84cbfc56b6-tcssz 1/1 Running 0 51m pod-template-hash=84cbfc56b6,run=nginx-deploy
run=nginx-deploy就是这个应用的标签，所以当pod的改变，并不会影响service的访问。
kubectl scale 动态伸缩应用副本
语法
Usage:
kubectl scale [--resource-version=version] [--current-replicas=count] --replicas=COUNT (-f FILENAME | TYPE NAME)
举例
#创建新的deployment
[root@master ~]# kubectl run myapp --image=ikubernetes/myapp:v1 --replicas=2
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/myapp created
[root@master ~]# kubectl get deployment
NAME READY UP-TO-DATE AVAILABLE AGE
myapp 2/2 2 2 48s
nginx-deploy 1/1 1 1 3h58m
#查看pod
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
client 0/1 Completed 0 3h2m 10.244.2.5 node02 <none> <none>
myapp-9b4987d5-98k45 1/1 Running 0 64s 10.244.1.4 node01 <none> <none>
myapp-9b4987d5-ncpb7 1/1 Running 0 64s 10.244.2.6 node02 <none> <none>
nginx-deploy-84cbfc56b6-tcssz 1/1 Running 0 3h26m 10.244.2.4 node02 <none> <none>
此时使用客户端访问
/ # wget -O - -q 10.244.2.6/hostname.html
myapp-9b4987d5-ncpb7
/ # wget -O - -q 10.244.1.4/hostname.html
myapp-9b4987d5-98k45
为myapp创建service
[root@master ~]# kubectl expose deployment myapp --name=myapp --port=80
service/myapp exposed
[root@master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22h
myapp ClusterIP 10.104.138.182 <none> 80/TCP 3s
nginx ClusterIP 10.98.2.12 <none> 80/TCP 3h21m
所生成的myapp的地址为10.104.138.182,端口暴漏为80，协议默认为TCP
使用客户端访问myapp服务
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
/ # wget -O - -q myapp/hostname.html
myapp-9b4987d5-98k45
/ # wget -O - -q myapp/hostname.html
myapp-9b4987d5-98k45
/ # wget -O - -q myapp/hostname.html
myapp-9b4987d5-ncpb7
#hostname.html显示的是pod的名字，也是pod的hostname
扩展副本数量
[root@master ~]# kubectl scale --replicas=5 deployment myapp
deployment.extensions/myapp scaled
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
client-f5cdb799f-pklmc 1/1 Running 0 5m46s 10.244.2.7 node02 <none> <none>
myapp-9b4987d5-98k45 1/1 Running 0 8m44s 10.244.1.4 node01 <none> <none>
myapp-9b4987d5-ck9bt 1/1 Running 0 9s 10.244.2.8 node02 <none> <none>
myapp-9b4987d5-gfqjp 1/1 Running 0 9s 10.244.2.9 node02 <none> <none>
myapp-9b4987d5-ncpb7 1/1 Running 0 8m44s 10.244.2.6 node02 <none> <none>
myapp-9b4987d5-wrp7r 1/1 Running 0 9s 10.244.1.5 node01 <none> <none>
nginx-deploy-84cbfc56b6-tcssz 1/1 Running 0 3h33m 10.244.2.4 node02 <none> <none>
此时使用客户端访问myapp服务
/ # for i in `seq 10000`;do wget -O - -q myapp/hostname.html;sleep 1;done
myapp-9b4987d5-wrp7r
myapp-9b4987d5-ncpb7
myapp-9b4987d5-wrp7r
myapp-9b4987d5-98k45
myapp-9b4987d5-wrp7r
myapp-9b4987d5-98k45
myapp-9b4987d5-gfqjp
myapp-9b4987d5-wrp7r
myapp-9b4987d5-gfqjp
myapp-9b4987d5-gfqjp
myapp-9b4987d5-ncpb7
再次修改副本数量为3
[root@master ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
client-f5cdb799f-pklmc 1/1 Running 0 8m32s 10.244.2.7 node02 <none> <none>
myapp-9b4987d5-98k45 1/1 Running 0 11m 10.244.1.4 node01 <none> <none>
myapp-9b4987d5-ck9bt 0/1 Terminating 0 2m55s 10.244.2.8 node02 <none> <none>
myapp-9b4987d5-gfqjp 0/1 Terminating 0 2m55s 10.244.2.9 node02 <none> <none>
myapp-9b4987d5-ncpb7 1/1 Running 0 11m 10.244.2.6 node02 <none> <none>
myapp-9b4987d5-wrp7r 1/1 Running 0 2m55s 10.244.1.5 node01 <none> <none>
nginx-deploy-84cbfc56b6-tcssz 1/1 Running 0 3h36m 10.244.2.4 node02 <none> <none>
#客户端查看
myapp-9b4987d5-98k45
myapp-9b4987d5-98k45
myapp-9b4987d5-wrp7r
myapp-9b4987d5-wrp7r
myapp-9b4987d5-wrp7r
myapp-9b4987d5-wrp7r
myapp-9b4987d5-ncpb7
myapp-9b4987d5-ncpb7
myapp-9b4987d5-98k45
此时服务就只会访问剩余的3个副本间
kubectl set image 应用版本升级
语法
Usage:
kubectl set image (-f FILENAME | TYPE NAME) CONTAINER_NAME_1=CONTAINER_IMAGE_1 ... CONTAINER_NAME_N=CONTAINER_IMAGE_N
[options]
举例
#升级myapp的版本为v2
[root@master ~]# kubectl set image deployment myapp myapp=ikubernetes/myapp:v2
deployment.extensions/myapp image updated
#查看更新过程
[root@master ~]# kubectl rollout status deployment myapp
Waiting for deployment "myapp" rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for deployment "myapp" rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for deployment "myapp" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "myapp" rollout to finish: 1 old replicas are pending termination...
deployment "myapp" successfully rolled out
#此过程客户端过程
/ # for i in `seq 10000`;do wget -O - -q myapp;sleep 1;done
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
也可以使用kubectl describe 来查看Pod的详细信息
[root@master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
client-f5cdb799f-pklmc 1/1 Running 0 21m
myapp-65899575cd-q9wt9 1/1 Running 0 4m56s
myapp-65899575cd-xhwmr 1/1 Running 0 4m58s
myapp-65899575cd-xnqd4 1/1 Running 0 4m58s
nginx-deploy-84cbfc56b6-tcssz 1/1 Running 0 3h49m
[root@master ~]# kubectl describe pods myapp-65899575cd-xhwmr
Name: myapp-65899575cd-xhwmr
Namespace: default
Priority: 0
PriorityClassName: <none>
Node: node01/10.0.0.11
Start Time: Thu, 28 Mar 2019 14:33:50 +0800
Labels: pod-template-hash=65899575cd
run=myapp
Annotations: <none>
Status: Running
IP: 10.244.1.10
Controlled By: ReplicaSet/myapp-65899575cd
Containers:
myapp:
Container ID: docker://5f9c63ce9f84fb6f863b44dd2eb9626f3eff2a599b48eb7000c84f5b70f6d2c9
Image: ikubernetes/myapp:v2
... ...
kubectl rollout 回滚
一种方法是直接修改image版本，另外一种是使用kubectl rollout
[root@master ~]# kubectl rollout -h
Manage the rollout of a resource.
Valid resource types include:
* deployments
* daemonsets
* statefulsets
Examples:
# Rollback to the previous deployment
kubectl rollout undo deployment/abc
# Check the rollout status of a daemonset
kubectl rollout status daemonset/foo
Available Commands:
history 显示 rollout 历史
pause 标记提供的 resource 为中止状态
resume 继续一个停止的 resource
status 显示 rollout 的状态
undo 撤销上一次的 rollout
Usage:
kubectl rollout SUBCOMMAND [options]
举例
[root@master ~]# kubectl rollout undo deployment myapp
deployment.extensions/myapp rolled back
[root@master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
client-f5cdb799f-pklmc 1/1 Running 0 24m
myapp-65899575cd-q9wt9 0/1 Terminating 0 8m15s
myapp-65899575cd-xhwmr 1/1 Terminating 0 8m17s
myapp-65899575cd-xnqd4 1/1 Running 0 8m17s
myapp-9b4987d5-47sjj 0/1 ContainerCreating 0 0s
myapp-9b4987d5-684q9 1/1 Running 0 2s
myapp-9b4987d5-djdr9 1/1 Running 0 3s
nginx-deploy-84cbfc56b6-tcssz 1/1 Running 0 3h52m
#客户端查看
/ # for i in `seq 10000`;do wget -O - -q myapp;sleep 1;done
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
#已经全部回退到上个版本
集群外部访问Service
[root@master ~]# kubectl edit svc myapp
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
kind: Service
metadata:
creationTimestamp: "2019-03-28T06:20:00Z"
labels:
run: myapp
name: myapp
namespace: default
resourceVersion: "36470"
selfLink: /api/v1/namespaces/default/services/myapp
uid: 8425bae4-5121-11e9-80a7-000c295ec349
spec:
clusterIP: 10.104.138.182
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
run: myapp
sessionAffinity: None
type: NodePort
status:
loadBalancer: {}
查看服务
[root@master ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 22h
myapp NodePort 10.104.138.182 <none> 80:30298/TCP 38m
nginx ClusterIP 10.98.2.12 <none> 80/TCP 4h
myapp服务80端口映射到节点的30298，且整个集群的30298节点都可以访问
另一节点访问
参考资料
https://www.cnblogs.com/linuxk
马永亮. Kubernetes进阶实战 (云计算与虚拟化技术丛书)