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ͼ1 ·Ö²¼Ê½ÏµÍ³¼Ü¹¹Ô¸¾°

Ö±µ½Kubernetes³öÏÖ֮ǰ£¬Ã»ÓÐÒ»¸ö¹«¿ªµÄƽ̨Éù³ÆÊµÏÖÁËÉÏÃæµÄ¡°Ô¸¾°¡±£¬ÕâÒ»´Î£¬ÓÖÊǹȸèµÄÉñ×÷¾ªÑÞÁËÎÒÃÇ¡£KubernetesÈÃÍŶÓÓиü¶àµÄʱ¼äÈ¥¹Ø×¢ÓëÒµÎñÐèÇóºÍÒµÎñÏà¹ØµÄ´úÂë±¾Éí£¬´Ó¶øÔںܴó³Ì¶ÈÉÏÌáÉýÁËÕû¸öÈí¼þÍŶӵŤ×÷ЧÂÊÓëͶÈë²ú³ö±È¡£

KubernetesÀïºËÐĵĸÅÄîÖ»ÓÐÒÔϼ¸¸ö£º

1.Service

2.Pod

3.Deployments(RC)

Service±íʾҵÎñϵͳÖеÄÒ»¸ö¡°Î¢·þÎñ¡±£¬Ã¿¸ö¾ßÌåµÄService±³ºó¶¼Óзֲ¼ÔÚ¶à¸ö»úÆ÷ÉϵĽø³ÌʵÀýÀ´Ìṩ·þÎñ£¬ÕâЩ½ø³ÌʵÀýÔÚKubernetesÀï±»·âװΪһ¸ö¸öPod£¬Pod»ù±¾µÈͬÓÚDocker Container£¬ÉÔÓв»Í¬µÄÊÇPodÆäʵÊÇÒ»×éÃÜÇÐÀ¦°óÔÚÒ»Æð²¢ÇÒ¡°Í¬Éú¹²ËÀ¡±µÄDocker Container£¬´ÓÄ£ÐÍÉè¼ÆµÄ½Ç¶ÈÀ´Ëµ£¬µÄÈ·´æÔÚÒ»¸ö·þÎñʵÀýÐèÒª¶à¸ö½ø³ÌÀ´Ìṩ·þÎñ²¢ÇÒËüÃÇÐèÒª¡°ÔÚÒ»Æð¡± µÄÇé¿ö¡£

KubernetesµÄServiceÓëÎÒÃÇͨ³£Ëù˵µÄ¡°Service¡±ÓÐÒ»¸öÃ÷ÏԵĵIJ»Í¬£¬Ç°ÕßÓÐÒ»¸öÐéÄâIPµØÖ·£¬³ÆÖ®Îª¡°ClusterIP¡±£¬·þÎñÓë·þÎñÖ®¼ä¡°ClusterIP+·þÎñ¶Ë¿Ú¡±µÄ·½Ê½½øÐзÃÎÊ£¬¶øÎÞÐèÒ»¸ö¸´ÔӵķþÎñ·¢ÏÖµÄAPI¡£ÕâÑùÒ»À´£¬Ö»ÒªÖªµÀij¸öServiceµÄClusterIP£¬¾ÍÄÜÖ±½Ó·ÃÎʸ÷þÎñ£¬Îª´Ë£¬KubernetesÌṩÁËÁ½ÖÖ·½Ê½À´½â¾öClusterIPµÄ·¢ÏÖÎÊÌ⣺

µÚÒ»ÖÖ·½Ê½ÊÇͨ¹ý»·¾³±äÁ¿£¬±ÈÈçÎÒÃǶ¨ÒåÁËÒ»¸öÃû³ÆÎªORDER_SERVICE µÄService £¬·ÖÅäµÄClusterIPΪ10.10.0.3 £¬ÔòÔÚÿ¸ö·þÎñʵÀýµÄÈÝÆ÷ÖУ¬»á×Ô¶¯Ôö¼Ó·þÎñÃûµ½ClusterIPÓ³ÉäµÄ»·¾³±äÁ¿£ºORDER_SERVICE_SERVICE_HOST=10.10.0.3£¬ÓÚÊdzÌÐòÀï¿ÉÒÔͨ¹ý·þÎñÃû¼òµ¥»ñµÃ¶ÔÓ¦µÄClusterIP¡£

µÚ¶þÖÖ·½Ê½ÊÇͨ¹ýDNS£¬ÕâÖÖ·½Ê½Ï£¬Ã¿¸ö·þÎñÃûÓëClusterIPµÄÓ³Éä¹ØÏµ»á±»×Ô¶¯Í¬²½µ½Kubernetes¼¯ÈºÀïÄÚÖõÄDNS×é¼þÀÓÚÊÇÖ±½Óͨ¹ý¶Ô·þÎñÃûµÄDNS Lookup»úÖÆ¾ÍÕÒµ½¶ÔÓ¦µÄClusterIPÁË£¬ÕâÖÖ·½Ê½¸ü¼ÓÖ±¹Û¡£

ÓÉÓÚKubernetesµÄServiceÕâÒ»¶ÀÌØÉè¼ÆÊµÏÖ˼·£¬Ê¹µÃËùÓÐÒÔTCP /IP ·½Ê½½øÐÐͨÐŵķֲ¼Ê½ÏµÍ³¶¼Äܼܺòµ¥µÄÇ¨ÒÆµ½Kubernetesƽ̨ÉÏÁË¡£Èçͼ2Ëùʾ£¬µ±¿Í»§¶Ë·ÃÎÊij¸öServiceµÄʱºò£¬KubernetesÄÚÖõÄ×é¼þkube-proxy͸Ã÷µÄʵÏÖÁ˵½ºó¶ËPodµÄÁ÷Á¿¸ºÔؾùºâ¡¢»á»°±£³Ö¡¢¹ÊÕÏ×Ô¶¯»Ö¸´µÈ¸ß¼¶ÌØÐÔ¡£

ͼ2 Kubernetes¸ºÔؾùºâÔ­Àí

KubernetesÊÇÈçºÎ°ó¶¨ServiceÓëPodµÄÄØ£¿ËüÈçºÎÇø·ÖÄÄЩPod¶ÔӦͬһ¸öService£¿´ð°¸Ò²ºÜ¼òµ¥¡ª¡ª¡°Ìù±êÇ©¡±¡£Ã¿¸öPod¶¼¿ÉÒÔÌùÒ»¸ö»ò¶à¸ö²»Í¬µÄ±êÇ©£¨Label£©£¬¶øÃ¿¸öService¶¼Ò»¸ö¡°±êǩѡÔñÆ÷¡±£¬±êǩѡÔñÆ÷£¨Label Selector£©È·¶¨ÁËҪѡÔñÓµÓÐÄÄЩ±êÇ©µÄ¶ÔÏ󣬱ÈÈçÏÂÃæÕâ¶ÎYAML¸ñʽµÄÄÚÈݶ¨ÒåÁËÒ»¸ö³ÆÖ®Îªku8-redis-masterµÄService£¬ËüµÄ±êǩѡÔñÆ÷µÄÄÚÈÝΪ¡°app: ku8-redis-master¡±£¬±íÃ÷ÓµÓС°app= ku8-redis-master¡±Õâ¸ö±êÇ©µÄPod¶¼ÊÇΪËü·þÎñµÄ¡£

apiVersion: v1
kind: Service
metadata:
name: ku8-redis-master
spec:
ports:
- port: 6379
selector:
app: ku8-redis-master

ÏÂÃæÊǶÔÓ¦µÄPodµÄ¶¨Ò壬עÒâµ½ËüµÄlabelsÊôÐÔµÄÄÚÈÝ£º

apiVersion: v1
kind: Pod
metadata:
name: ku8-redis-master
labels:
app: ku8-redis-master
spec:
containers:
- name: server
image: redis
ports:
- containerPort: 6379
restartPolicy: Never

×îºó£¬ÎÒÃÇÀ´¿´¿´Deployment/RCµÄ¸ÅÄËüµÄ×÷ÓÃÊÇÓÃÀ´¸æËßKubernetes£¬Ä³ÖÖÀàÐ͵ÄPod£¨ÓµÓÐij¸öÌØ¶¨±êÇ©µÄPod£©ÐèÒªÔÚ¼¯ÈºÖд´½¨¼¸¸ö¸±±¾ÊµÀý£¬Deployment/RCµÄ¶¨ÒåÆäʵÊÇPod´´½¨Ä£°å£¨Template£©+Pod¸±±¾ÊýÁ¿µÄÉùÃ÷£¨replicas£©£º

apiVersion: v1
kind: ReplicationController
metadata:
name: ku8-redis-slave
spec:
replicas: 2
template:
metadata:
labels:
app: ku8-redis-slave
spec:
containers:
- name: server
image: devopsbq/redis-slave
env:
- name: MASTER_ADDR
value: ku8-redis-master
ports:
- containerPort: 6379

Kubernetes¿ª·¢Ö¸ÄÏ

±¾½ÚÎÒÃÇÒÔÒ»¸ö´«Í³µÄJavaÓ¦ÓÃΪÀý£¬À´ËµÃ÷ÈçºÎ½«Æä¸ÄÔìÇ¨ÒÆµ½KubernetesµÄÏȽøÎ¢·þÎñ¼Ü¹¹Æ½Ì¨ÉÏÀ´¡£

Èçͼ3Ëùʾ£¬ÎÒÃǵÄÕâ¸öʾÀý³ÌÐòÊÇÒ»¸öÅÜÔÚTomcatÀïµÄWebÓ¦Óã¬ÎªÁ˼ò»¯£¬Ã»ÓÐÓÃÈκοò¼Ü£¬Ö±½ÓÔÚJSPÒ³ÃæÀïͨ¹ýJDBC²Ù×÷Êý¾Ý¿â¡£

ͼ3 ´ý¸ÄÔìµÄJava WebÓ¦ÓÃ

ÉÏÊöϵͳÖУ¬ÎÒÃǽ«MySQL·þÎñÓëWebÓ¦Ó÷ֱð½¨Ä£ÎªKubernetesÖеÄÒ»¸öService£¬ÆäÖÐMySQL·þÎñµÄService¶¨ÒåÈçÏ£º

apiVersion: v1
kind: Service
metadata:
name: mysql
spec:
ports:
- port: 3306
selector:
app: mysql_pod

MySQL·þÎñ¶ÔÓ¦µÄDeployment/RCµÄ¶¨ÒåÈçÏ£º

apiVersion: v1
kind: ReplicationController
metadata:
name: mysql-deployment
spec:
replicas: 1
template:
metadata:
labels:
app: mysql_pod
spec:
containers:
- name: mysql
image: mysql
imagePullPolicy: IfNotPresent
ports:
- containerPort: 3306
env:
- name: MYSQL_ROOT_PASSWORD
value: "123456"

ÏÂÒ»²½£¬ÎÒÃÇÐèÒª¸ÄÔìWebÓ¦ÓÃÖлñÈ¡MySQLµØÖ·µÄÕâ¶Î´úÂ룬´ÓÈÝÆ÷µÄ»·¾³±äÁ¿ÖлñÈ¡ÉÏÊöMySQL·þÎñµÄIPÓëPort£º

 String ip=System.getenv("MYSQL_SERVICE_HOST");
String port=System.getenv("MYSQL_SERVICE_PORT");
ip=(ip==null)?"localhost":ip;
port=(port==null)?"3306":port;
conn = java.sql.DriverManager.getConnection("jdbc:mysql://"+ip+":"+port+"?useUnicode=true&characterEncoding=UTF-8", "root","123456");

½ÓÏÂÀ´£¬½«´ËWebÓ¦Óôò°üΪһ¸ö±ê×¼µÄDocker¾µÏñ£¬Ãû×ÖΪk8s_myweb_image£¬Õâ¸ö¾µÏñÖ±½Ó´Ó¹Ù·½Tomcat¾µÏñÉÏÌí¼ÓÎÒÃǵÄWebÓ¦ÓÃĿ¼demoµ½webappsĿ¼Ï¼´¿É£¬Dockerfile±È½Ï¼òµ¥£¬ÈçÏÂËùʾ£º

FROM tomcat
MAINTAINER bestme <bestme@hpe.com>
ADD demo /usr/local/tomcat/webapps/demo

ÀàËÆÖ®Ç°µÄMySQL·þÎñ¶¨Ò壬ÏÂÃæÊÇÕâ¸öWebÓ¦ÓõÄService¶¨Ò壺

apiVersion: v1
kind: Service
metadata:
name: hpe-java-web
spec:
type: NodePort
ports:
- port: 8080
nodePort: 31002
selector:
app: hpe_java_web_pod

ÎÒÃÇ¿´µ½ÕâÀïÓÃÁËÒ»¸öÌØÊâµÄÓï·¨£ºNodePort£¬²¢ÇÒ¸³ÖµÎª31002£¬´ÊÓï·¨µÄ×÷ÓÃÊÇÈôËWebÓ¦ÓÃÈÝÆ÷ÀïµÄ8080¶Ë¿Ú±»NATÓ³Éäµ½kuberntetesÀïÿ¸öNodeÉϵÄ31002¶Ë¿Ú£¬´Ó¶øÎÒÃÇ¿ÉÒÔÓÃNodeµÄIPºÍ¶Ë¿Ú31002À´·ÃÎÊTomcatµÄ8080¶Ë¿Ú£¬±ÈÈçÎÒ±¾»úµÄ¿ÉÒÔͨ¹ýhttp://192.168.18.137:31002/demo/À´·ÃÎÊÕâ¸öWebÓ¦Óá£

ÏÂÃæÊÇWebÓ¦ÓõÄService¶ÔÓ¦µÄDeployment/RCµÄ¶¨Ò壺

apiVersion: v1
kind: ReplicationController
metadata:
name: hpe-java-web-deployement
spec:
replicas: 1
template:
metadata:
labels:
app: hpe_java_web_pod
spec:
containers:
- name: myweb
image: k8s_myweb_image
imagePullPolicy: IfNotPresent
ports:
- containerPort: 8080

¶¨ÒåºÃËùÓÐServiceÓë¶ÔÓ¦µÄDeployment/RCÃèÊöÎļþºó£¨×ܹ²4¸öyamlÎļþ£©£¬ÎÒÃÇ¿ÉÒÔͨ¹ýKubernetesµÄÃüÁîÐй¤¾ßkubectrl ¨Cf create xxx.yamlÌá½»µ½¼¯ÈºÀÈç¹ûÒ»ÇÐÕý³££¬Kubernetes»áÔÚ¼¸·ÖÖÓÄÚ×Ô¶¯Íê³É²¿Êð£¬Äã»á¿´µ½Ïà¹ØµÄ×ÊÔ´¶ÔÏó¶¼ÒѾ­´´½¨³É¹¦£º

-bash-4.2# kubectl get svc
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
hpe-java-web 10.254.183.22 nodes 8080/TCP 36m
kubernetes 10.254.0.1 <none> 443/TCP 89d
mysql 10.254.170.22 <none> 3306/TCP 36m
-bash-4.2# kubectl get pods
NAME READY STATUS RESTARTS AGE
hpe-java-web-deployement-q8t9k 1/1 Running 0 36m
mysql-deployment-5py34 1/1 Running 0 36m
-bash-4.2# kubectl get rc
NAME DESIRED CURRENT AGE
hpe-java-web-deployement 1 1 37m
mysql-deployment 1 1 37m

½áÊøÓï

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´ËÍ⣬ΪÁ˽µµÍKubernetesµÄÓ¦ÓÃÃż÷£¬ÎÒÃÇ£¨»ÝÆÕÖйúCMSÑз¢ÍŶӣ©¿ªÔ´ÁËÒ»¸öKubernetesµÄ¹ÜÀíÆ½Ì¨Ku8 eye£¬ÏîÄ¿µØÖ·Îªhttps://github.com/bestcloud/ku8eye£¬Ku8 eyeºÜÊʺÏÓÃ×÷ΪС¹«Ë¾µÄÄÚ²¿PaaSÓ¦ÓùÜÀíÆ½Ì¨£¬Æä¹¦Äܼܹ¹ÀàËÆÍ¼4ËùʾµÄKu8 ManagerÆóÒµ°æ£¬Ku8 eye²ÉÓÃJava¿ª·¢Íê³É£¬ÊÇĿǰΨһһ¸ö¿ªÔ´µÄKubernetesͼÐλ¯¹ÜÀíϵͳ£¬Ò²Ï£Íû¸ü¶à°®ºÃ¿ªÔ´ºÍÓÐÄÜÁ¦µÄͬÐвÎÓë½øÀ´£¬½«Ëü´òÔì³ÉΪ¹úÄÚ×îºÃµÄÔÆ¼ÆËãÁìÓòµÄ¿ªÔ´Èí¼þ¡£

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