使用python脚本自动生成K8S-YAML的方法示例
1、生成servie.yaml
1.1、yaml转json
service模板yaml
apiVersion:v1
kind:Service
metadata:
name:${jarName}
labels:
name:${jarName}
version:v1
spec:
ports:
-port:${port}
targetPort:${port}
selector:
name:${jarName}
转成json的结构
{
"apiVersion":"v1",
"kind":"Service",
"metadata":{
"name":"${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
defcreate_service_yaml(service_name,ports):
#将yaml读取为json，然后修改所有需要修改的${jarName}
service_data['metadata']['name']=service_name
service_data['metadata']['labels']['name']=service_name
service_data['spec']['selector']['name']=service_name
#.spec.ports比较特殊，是一个字典列表，由于传入的ports难以确定数量，难以直接修改
#新建一个列表，遍历传入的ports列表，将传入的每个port都生成为一个字典，添加入新列表中
new_spec_ports=[]
forportinports:
port=int(port)
new_port={'port':port,'targetPort':port}
new_spec_ports.append(new_port)
#修改.spec.ports为新列表
service_data['spec']['ports']=new_spec_ports
2、生成deployment.yaml
2.1、yaml转json
deployment模板yaml
apiVersion:apps/v1
kind:Deployment
metadata:
name:${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
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}:${tag}"
}
],
"imagePullSecrets":[
{
"name":"registry-secret"
}
]
}
}
}
}
2.2、关键代码
#传入service_name及imagetag
defcreate_deploy_yaml(service_name,tag):
#首先修改所有的${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
"""
TheScriptforAutoCreateDeploymentYaml.
File:auto_create_deploy_yaml
User:miaocunfa
CreateDate:2020-06-10
CreateTime:17:06
"""
importos
fromruamel.yamlimportYAML
yaml=YAML()
defcreate_service_yaml(service_name,ports):
service_mould_file="mould/info-service-mould.yaml"
isServiceMould=os.path.isfile(service_mould_file)
ifisServiceMould:
#readService-mouldyamlconvertjson
withopen(service_mould_file,encoding='utf-8')asyaml_obj:
service_data=yaml.load(yaml_obj)
#UpdatejarName
service_data['metadata']['name']=service_name
service_data['metadata']['labels']['name']=service_name
service_data['spec']['selector']['name']=service_name
#Updateport
new_spec_ports=[]
forportinports:
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
#jsonToserviceyaml
save_file=tag+'/'+service_name+'_svc.yaml'
withopen(save_file,mode='w',encoding='utf-8')asyaml_obj:
yaml.dump(service_data,yaml_obj)
print(save_file+":Success!")
else:
print("ServiceMouldFileisNotExist!")
defcreate_deploy_yaml(service_name,tag):
deploy_mould_file="mould/info-deploy-mould.yaml"
isDeployMould=os.path.isfile(deploy_mould_file)
ifisDeployMould:
withopen(deploy_mould_file,encoding='utf-8')asyaml_obj:
deploy_data=yaml.load(yaml_obj)
#UpdatejarName
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
#Updatecontainers
image="reg.test.local/library/"+service_name+":"+tag
new_containers=[{'name':service_name,'image':image}]
deploy_data['spec']['template']['spec']['containers']=new_containers
#jsonToserviceyaml
save_file=tag+'/'+service_name+'_deploy.yaml'
withopen(save_file,mode='w',encoding='utf-8')asyaml_obj:
yaml.dump(deploy_data,yaml_obj)
print(save_file+":Success!")
else:
print("DeployMouldFileisNotExist!")
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("")
ifos.path.isdir(answer):
raiseSystemExit(answer+':isAlreadyexists!')
else:
tag=answer
os.makedirs(tag)
forservice_name,service_portsinservices.items():
create_service_yaml(service_name,service_ports)
create_deploy_yaml(service_name,tag)
4、执行效果
➜python3Auto_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 total12 drwxr-xr-x.2rootroot4096Jun2918:240.0.1 #生成的serviceyaml ➜catinfo-message-service_svc.yaml apiVersion:v1 kind:Service metadata: name:info-message-service labels: name:info-message-service version:v1 spec: ports: -name:port8555 port:8555 targetPort:8555 -name:port9666 port:9666 targetPort:9666 selector: name:info-message-service #生成的deploymentyaml ➜catinfo-message-service_deploy.yaml apiVersion:apps/v1 kind:Deployment metadata: name:info-message-service labels: name:info-message-service spec: selector: matchLabels: name:info-message-service replicas:2 template: metadata: labels: name:info-message-service 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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