python生成yaml_使用python脚本自动生成K8S-YAML

使用python脚本自动生成K8S-YAML

1、生成 servie.yaml

1.1、yaml转json

service模板yaml

apiVersion: v1

kind: Service

metadata:

labels:

version: v1

spec:

ports:

- port: ${port}

targetPort: ${port}

selector:

转成json的结构

{

"apiVersion": "v1",

"kind": "Service",

"metadata": {

"name": "${jarName}",

"labels": {

"name": "${jarName}",

"version": "v1"

}

"spec": {

"ports": [

{

"port": "${port}",

"targetPort": "${port}"

}

"selector": {

"name": "${jarName}"

}

1.2、关键代码

# 通过传入service_name及ports列表

def create_service_yaml(service_name, ports):

# 将yaml读取为json，然后修改所有需要修改的${jarName}

service_data['metadata']['name'] = service_name

service_data['metadata']['labels']['name'] = service_name

service_data['spec']['selector']['name'] = service_name

# .spec.ports 比较特殊，是一个字典列表，由于传入的ports难以确定数量，难以直接修改

# 新建一个列表，遍历传入的ports列表，将传入的每个port都生成为一个字典，添加入新列表中

new_spec_ports = []

for port in ports:

port = int(port)

new_port = {'port': port, 'targetPort': port}

new_spec_ports.append(new_port)

# 修改.spec.ports为新列表

service_data['spec']['ports'] = new_spec_ports

2、生成 deployment.yaml

2.1、yaml转json

deployment模板yaml

apiVersion: apps/v1

kind: Deployment

metadata:

labels:

spec:

selector:

matchLabels:

replicas: 1

template:

metadata:

labels:

spec:

containers:

- name: ${jarName}

image: reg.test.local/library/${jarName}:${tag}

imagePullSecrets:

- name: registry-secret

转成的json结构

{

"apiVersion": "apps/v1",

"kind": "Deployment",

"metadata": {

"name": "${jarName}",

"labels": {

"name": "${jarName}"

}

"spec": {

"selector": {

"matchLabels": {

"name": "${jarName}"

}

"replicas": 1,

"template": {

"metadata": {

"labels": {

"name": "${jarName}"

}

"spec": {

"containers": [

{

"name": "${jarName}",

"image": "reg.test.local/library/${jarName}:${tag}"

}

"imagePullSecrets": [

{

"name": "registry-secret"

}

]

}

2.2、关键代码

# 传入service_name及image tag

def create_deploy_yaml(service_name, tag):

# 首先修改所有的${jarName}

deploy_data['metadata']['name'] = service_name

deploy_data['metadata']['labels']['name'] = service_name

deploy_data['spec']['selector']['matchLabels']['name'] = service_name

deploy_data['spec']['template']['metadata']['labels']['name'] = service_name

# 由于.spec.template.spec.containers的特殊性，我们采用直接修改的方式

# 首先拼接image字段

image = "reg.test.local/library/" + service_name + ":" + tag

# 创建new_containers字典列表

new_containers = [{'name': service_name, 'image': image}]

deploy_data['spec']['template']['spec']['containers'] = new_containers

3、完整脚本

#!/usr/bin/python

# encoding: utf-8

"""

The Script for Auto Create Deployment Yaml.

File: auto_create_deploy_yaml

User: miaocunfa

Create Date: 2020-06-10

Create Time: 17:06

"""

import os

from ruamel.yaml import YAML

yaml = YAML()

def create_service_yaml(service_name, ports):

service_mould_file = "mould/info-service-mould.yaml"

isServiceMould = os.path.isfile(service_mould_file)

if isServiceMould:

# read Service-mould yaml convert json

with open(service_mould_file, encoding='utf-8') as yaml_obj:

service_data = yaml.load(yaml_obj)

# Update jarName

service_data['metadata']['name'] = service_name

service_data['metadata']['labels']['name'] = service_name

service_data['spec']['selector']['name'] = service_name

# Update port

new_spec_ports = []

for port in ports:

port = int(port)

portname = 'port' + str(port)

new_port = {'name': portname, 'port': port, 'targetPort': port}

new_spec_ports.append(new_port)

service_data['spec']['ports'] = new_spec_ports

# json To service yaml

save_file = tag + '/' + service_name + '_svc.yaml'

with open(save_file, mode='w', encoding='utf-8') as yaml_obj:

yaml.dump(service_data, yaml_obj)

print(save_file + ": Success!")

else:

print("Service Mould File is Not Exist!")

def create_deploy_yaml(service_name, tag):

deploy_mould_file = "mould/info-deploy-mould.yaml"

isDeployMould = os.path.isfile(deploy_mould_file)

if isDeployMould:

with open(deploy_mould_file, encoding='utf-8') as yaml_obj:

deploy_data = yaml.load(yaml_obj)

# Update jarName

deploy_data['metadata']['name'] = service_name

deploy_data['metadata']['labels']['name'] = service_name

deploy_data['spec']['selector']['matchLabels']['name'] = service_name

deploy_data['spec']['template']['metadata']['labels']['name'] = service_name

# Update containers

image = "reg.test.local/library/" + service_name + ":" + tag

new_containers = [{'name': service_name, 'image': image}]

deploy_data['spec']['template']['spec']['containers'] = new_containers

# json To service yaml

save_file = tag + '/' + service_name + '_deploy.yaml'

with open(save_file, mode='w', encoding='utf-8') as yaml_obj:

yaml.dump(deploy_data, yaml_obj)

print(save_file + ": Success!")

else:

print("Deploy Mould File is Not Exist!")

services = {

'info-gateway': ['9999'],

'info-admin': ['7777'],

'info-config': ['8888'],

'info-message-service': ['8555', '9666'],

'info-auth-service': ['8666'],

'info-scheduler-service': ['8777'],

'info-uc-service': ['8800'],

'info-ad-service': ['8801'],

'info-community-service': ['8802'],

'info-groupon-service': ['8803'],

'info-hotel-service': ['8804'],

'info-nearby-service': ['8805'],

'info-news-service': ['8806'],

'info-store-service': ['8807'],

'info-payment-service': ['8808'],

'info-agent-service': ['8809'],

'info-consumer-service': ['8090'],

}

prompt = "\n请输入要生成的tag: "

answer = input(prompt)

print("")

if os.path.isdir(answer):

raise SystemExit(answer + ': is Already exists!')

else:

tag = answer

os.makedirs(tag)

for service_name, service_ports in services.items():

create_service_yaml(service_name, service_ports)

create_deploy_yaml(service_name, tag)

4、执行效果

➜ python3 Auto_Create_K8S_YAML.py

请输入要生成的tag: 0.0.1

0.0.1/info-gateway_svc.yaml: Success!

0.0.1/info-gateway_deploy.yaml: Success!

0.0.1/info-admin_svc.yaml: Success!

0.0.1/info-admin_deploy.yaml: Success!

0.0.1/info-config_svc.yaml: Success!

0.0.1/info-config_deploy.yaml: Success!

0.0.1/info-message-service_svc.yaml: Success!

0.0.1/info-message-service_deploy.yaml: Success!

0.0.1/info-auth-service_svc.yaml: Success!

0.0.1/info-auth-service_deploy.yaml: Success!

0.0.1/info-scheduler-service_svc.yaml: Success!

0.0.1/info-scheduler-service_deploy.yaml: Success!

0.0.1/info-uc-service_svc.yaml: Success!

0.0.1/info-uc-service_deploy.yaml: Success!

0.0.1/info-ad-service_svc.yaml: Success!

0.0.1/info-ad-service_deploy.yaml: Success!

0.0.1/info-community-service_svc.yaml: Success!

0.0.1/info-community-service_deploy.yaml: Success!

0.0.1/info-groupon-service_svc.yaml: Success!

0.0.1/info-groupon-service_deploy.yaml: Success!

0.0.1/info-hotel-service_svc.yaml: Success!

0.0.1/info-hotel-service_deploy.yaml: Success!

0.0.1/info-nearby-service_svc.yaml: Success!

0.0.1/info-nearby-service_deploy.yaml: Success!

0.0.1/info-news-service_svc.yaml: Success!

0.0.1/info-news-service_deploy.yaml: Success!

0.0.1/info-store-service_svc.yaml: Success!

0.0.1/info-store-service_deploy.yaml: Success!

0.0.1/info-payment-service_svc.yaml: Success!

0.0.1/info-payment-service_deploy.yaml: Success!

0.0.1/info-agent-service_svc.yaml: Success!

0.0.1/info-agent-service_deploy.yaml: Success!

0.0.1/info-consumer-service_svc.yaml: Success!

0.0.1/info-consumer-service_deploy.yaml: Success!

➜ ll

total 12

drwxr-xr-x. 2 root root 4096 Jun 29 18:24 0.0.1

# 生成的 service yaml

➜ cat info-message-service_svc.yaml

apiVersion: v1

kind: Service

metadata:

labels:

version: v1

spec:

ports:

- name: port8555

port: 8555

targetPort: 8555

- name: port9666

port: 9666

targetPort: 9666

selector:

# 生成的 deployment yaml

➜ cat info-message-service_deploy.yaml

apiVersion: apps/v1

kind: Deployment

metadata:

labels:

spec:

selector:

matchLabels:

replicas: 2

template:

metadata:

labels:

spec:

containers:

- name: info-message-service

image: reg.test.local/library/info-message-service:0.0.1

imagePullSecrets:

- name: registry-secret

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