Kompose-使用Docker Compose生成k8s资源

官网原文地址
Kompose（名字与Docker Compose相似），是一个将compose转换成为容器编排（k8s或者OpenShift）的工具。

更多的信息请查看kompose网站http://kompose.io/。

开始之前

你必须有个k8s集群，同时kubectl CLI工具必须被正确的配置以连接k8s集群。如果你还没有准备好k8s集群，你可以使用Minikube，或者使用以下的测试环境：

• Katacoda

• Play with Kubernetes

使用kubectl version，检查版本信息。

安装Kompose

有多种方式安装kompose，推荐的方式是从GitHub下载2进制包进行安装

GitHub release

# Linux 
curl -L https://github.com/kubernetes/kompose/releases/download/v1.1.0/kompose-linux-amd64 -o kompose

# macOS
curl -L https://github.com/kubernetes/kompose/releases/download/v1.1.0/kompose-darwin-amd64 -o kompose

# Windows
curl -L https://github.com/kubernetes/kompose/releases/download/v1.1.0/kompose-windows-amd64.exe -o kompose.exe

chmod +x kompose
sudo mv ./kompose /usr/local/bin/kompose

CentOs

# 安装epel源
sudo yum install epel-release
# 安装kompose
sudo yum -y install kompose

使用手册

kompose convert

Kompose supports conversion of V1, V2, and V3 Docker Compose files into Kubernetes and OpenShift objects.

$ kompose --file docker-voting.yml convert
WARN Unsupported key networks - ignoring
WARN Unsupported key build - ignoring
INFO Kubernetes file "worker-svc.yaml" created
INFO Kubernetes file "db-svc.yaml" created
INFO Kubernetes file "redis-svc.yaml" created
INFO Kubernetes file "result-svc.yaml" created
INFO Kubernetes file "vote-svc.yaml" created
INFO Kubernetes file "redis-deployment.yaml" created
INFO Kubernetes file "result-deployment.yaml" created
INFO Kubernetes file "vote-deployment.yaml" created
INFO Kubernetes file "worker-deployment.yaml" created
INFO Kubernetes file "db-deployment.yaml" created

$ ls
db-deployment.yaml  docker-compose.yml         docker-gitlab.yml  redis-deployment.yaml  result-deployment.yaml  vote-deployment.yaml  worker-deployment.yaml
db-svc.yaml         docker-voting.yml          redis-svc.yaml     result-svc.yaml        vote-svc.yaml           worker-svc.yaml

一次指定多个docker-compose文件：

$ kompose -f docker-compose.yml -f docker-guestbook.yml convert
INFO Kubernetes file "frontend-service.yaml" created         
INFO Kubernetes file "mlbparks-service.yaml" created         
INFO Kubernetes file "mongodb-service.yaml" created          
INFO Kubernetes file "redis-master-service.yaml" created     
INFO Kubernetes file "redis-slave-service.yaml" created      
INFO Kubernetes file "frontend-deployment.yaml" created      
INFO Kubernetes file "mlbparks-deployment.yaml" created      
INFO Kubernetes file "mongodb-deployment.yaml" created       
INFO Kubernetes file "mongodb-claim0-persistentvolumeclaim.yaml" created 
INFO Kubernetes file "redis-master-deployment.yaml" created  
INFO Kubernetes file "redis-slave-deployment.yaml" created   

$ ls
mlbparks-deployment.yaml  mongodb-service.yaml                       redis-slave-service.jsonmlbparks-service.yaml  
frontend-deployment.yaml  mongodb-claim0-persistentvolumeclaim.yaml  redis-master-service.yaml
frontend-service.yaml     mongodb-deployment.yaml                    redis-slave-deployment.yaml
redis-master-deployment.yaml

如果同时提供多个docker-compose文件，配置将会合并。配置将会被后面的文件覆盖。

kompose up

$ kompose --file ./examples/docker-guestbook.yml up
We are going to create Kubernetes deployments and services for your Dockerized application.
If you need different kind of resources, use the 'kompose convert' and 'kubectl create -f' commands instead.

INFO Successfully created service: redis-master   
INFO Successfully created service: redis-slave    
INFO Successfully created service: frontend       
INFO Successfully created deployment: redis-master
INFO Successfully created deployment: redis-slave
INFO Successfully created deployment: frontend    

Your application has been deployed to Kubernetes. You can run 'kubectl get deployment,svc,pods' for details.

$ kubectl get deployment,svc,pods
NAME                                              DESIRED       CURRENT       UP-TO-DATE   AVAILABLE   AGE
deployment.extensions/frontend                    1             1             1            1           4m
deployment.extensions/redis-master                1             1             1            1           4m
deployment.extensions/redis-slave                 1             1             1            1           4m

NAME                         TYPE               CLUSTER-IP    EXTERNAL-IP   PORT(S)      AGE
service/frontend             ClusterIP          10.0.174.12   <none>        80/TCP       4m
service/kubernetes           ClusterIP          10.0.0.1      <none>        443/TCP      13d
service/redis-master         ClusterIP          10.0.202.43   <none>        6379/TCP     4m
service/redis-slave          ClusterIP          10.0.1.85     <none>        6379/TCP     4m

NAME                                READY         STATUS        RESTARTS     AGE
pod/frontend-2768218532-cs5t5       1/1           Running       0            4m
pod/redis-master-1432129712-63jn8   1/1           Running       0            4m
pod/redis-slave-2504961300-nve7b    1/1           Running       0            4m

注意：

• 您必须具有正在运行的Kubernetes集群，其中包含预配置的kubectl上下文。

• 仅生成部署和服务并将其部署到Kubernetes。如果您需要不同类型的资源，请改用kompose convertandkubectl create -f命令。

kompose down

将“composed”应用程序部署到Kubernetes后，$ kompose down将通过删除其部署和服务来帮助您取消应用程序。如果需要删除其他资源，请使用'kubectl'命令。

$ kompose --file docker-guestbook.yml down
INFO Successfully deleted service: redis-master   
INFO Successfully deleted deployment: redis-master
INFO Successfully deleted service: redis-slave    
INFO Successfully deleted deployment: redis-slave
INFO Successfully deleted service: frontend       
INFO Successfully deleted deployment: frontend