使用kompose 快速转换dokcer-compose 文件为k8s deploy 文件
kompose 是一个不错的快速转换docker-compose 文件为k8s 部署yaml文件的工具，使用次工具我们
可以将简单的docker-compose文件，转换为复杂的yaml文件，对于使用者来说可以减少yaml的错误，
同时可以实现docker-compose 向k8s 的快速迁移
简单docker-compose 文件
version: '3'
services:
gogs-service:
image: gogs/gogs
restart: always
ports:
- "10022:22"
- "10080:3000"
volumes:
- ./data/gogs:/data
depends_on:
- mysql-gogs
mysql-gogs:
image: mysql:5.7.16
restart: 'always'
volumes:
- ./gogs/mysql:/var/lib/mysql
ports:
- 3308:3306
command: --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
environment:
MYSQL_ROOT_PASSWORD: dalongrong
MYSQL_DATABASE: gogs
MYSQL_USER: gogs
MYSQL_PASSWORD: dalongrong
TZ: Asia/Shanghai
说明，这是一个gogs git 工具的安装，docker-compose 文件不是很复杂
安装kompose
brew install kompose生成k8s yaml 部署文件
kompose convert效果如下，文件很简单，包含了deploy 以及pvc 的定义，ingress 是我自己添加的
生成的deploy（gogs）
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
kompose.cmd: kompose convert
kompose.version: 1.17.0 ()
creationTimestamp: null
labels:
io.kompose.service: gogs-service
name: gogs-service
spec:
replicas: 1
strategy:
type: Recreate
template:
metadata:
creationTimestamp: null
labels:
io.kompose.service: gogs-service
spec:
containers:
- image: gogs/gogs
name: gogs-service
ports:
- containerPort: 22
- containerPort: 3000
resources: {}
volumeMounts:
- mountPath: /data
name: gogs-service-claim0
restartPolicy: Always
volumes:
- name: gogs-service-claim0
persistentVolumeClaim:
claimName: gogs-service-claim0
status: {}
service
apiVersion: v1
kind: Service
metadata:
annotations:
kompose.cmd: kompose convert
kompose.version: 1.17.0 ()
creationTimestamp: null
labels:
io.kompose.service: gogs-service
name: gogs-service
spec:
ports:
- name: "10022"
port: 10022
targetPort: 22
- name: "10080"
port: 10080
targetPort: 3000
selector:
io.kompose.service: gogs-service
status:
loadBalancer: {}
说明，mysql 运行需要修改下,使用init container 删除文件夹
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
kompose.cmd: kompose convert
kompose.version: 1.17.0 ()
creationTimestamp: null
labels:
io.kompose.service: mysql-gogs
name: mysql-gogs
spec:
replicas: 1
strategy:
type: Recreate
template:
metadata:
creationTimestamp: null
labels:
io.kompose.service: mysql-gogs
spec:
initContainers:
- name: "remove-lost-found"
image: "busybox:1.25.0"
command: ["rm", "-fr", "/var/lib/mysql/lost+found"]
volumeMounts:
- name: mysql-gogs-claim0
mountPath: /var/lib/mysql
containers:
- args:
- --character-set-server=utf8mb4
- --collation-server=utf8mb4_unicode_ci
env:
- name: MYSQL_DATABASE
value: gogs
- name: MYSQL_PASSWORD
value: dalongrong
- name: MYSQL_ROOT_PASSWORD
value: dalongrong
- name: MYSQL_USER
value: gogs
- name: TZ
value: Asia/Shanghai
image: mysql:5.7.16
name: mysql-gogs
ports:
- containerPort: 3306
resources: {}
volumeMounts:
- mountPath: /var/lib/mysql
name: mysql-gogs-claim0
restartPolicy: Always
volumes:
- name: mysql-gogs-claim0
persistentVolumeClaim:
claimName: mysql-gogs-claim0
status: {}说明
使用起来还是比较方便的，可以减少好多代码，目前来说，k8s api 的支持感觉不是很好，而且还有一些bug，但是不影响
使用，结合这个工具，我们可以快速的向k8s应用迁移
参考架构图
参考资料
https://github.com/kubernetes/kompose/