K8S-应用访问

1 service对象定位

2 Service 实践

手工创建Service

根据应用部署资源对象，创建SVC对象
kubectl expose deployment nginx --port=80 --type=NodePort

yaml方式创建Service

nginx-web的service资源清单文件
apiVersion: v1
kind: Service
metadata:name: sswang-nginx-weblabels:app: nginx-web
spec:type: NodePortselector:app: nginx-webports:- protocol: TCPname: httpport: 80targetPort: 80nodePort: 31080

tomcat-web的service资源清单文件
apiVersion: v1
kind: Service
metadata:name: sswang-tomcat-weblabels:app: tomcat-web
spec:type: NodePortselector:app: tomcatports:- protocol: TCPname: httpport: 8080targetPort: 8080nodePort: 31880

3 外部Service

部署外部mysql环境

准备软件源
]# cat /etc/yum.repos.d/MariaDB.repo
[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.3/centos7-amd64
gpgcheck=0更新系统软件包：
yum makecache fast安装 MySQL 服务器
yum install mariadb-server mariadb -y 设置 MySQL 服务在启动时自动启动
systemctl start mariadb.service
systemctl enable mariadb.service

开启 MySQL 服务器远程访问能力
]# vim /etc/my.cnf.d/server.cnf
[mysqld]
bind-address = 0.0.0.0重启 MySQL 服务使配置生效
systemctl restart mariadb.service配置远程主机登录权限
mysql -uroot -p123456 -e "GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;"
mysql -uroot -p123456 -e "FLUSH PRIVILEGES;"

主库上创建数据库
]# mysql -uroot -p123456 -e "
CREATE DATABASE bookinfo default charset utf8 collate utf8_general_ci;
USE bookinfo;
CREATE TABLE book_info (id INT AUTO_INCREMENT PRIMARY KEY,book_name VARCHAR(100),author VARCHAR(100),date_of_issue DATE,isDelete BOOLEAN
);
INSERT INTO book_info (book_name, author, date_of_issue, isDelete) VALUES('Book 1', 'Author 1', '2022-01-01', FALSE),('Book 2', 'Author 2', '2022-02-01', FALSE),('Book 3', 'Author 3', '2022-03-01', TRUE);
"

定制资源清单文件

apiVersion: v1
kind: Namespace
metadata:name: external-ns
---
apiVersion: v1
kind: Endpoints
metadata:name: ex-mysqlnamespace: external-ns
subsets:- addresses:- ip: 10.0.0.18ports:- port: 3306
---
apiVersion: v1
kind: Service
metadata:name: ex-mysqlnamespace: external-ns
spec:type: ClusterIPports:- port: 3306targetPort: 3306
---
apiVersion: apps/v1
kind: Deployment
metadata:name: bookinfonamespace: external-ns
spec:replicas: 1selector:matchLabels:app: flask-bookinfotemplate:metadata:labels:app: flask-bookinfospec:containers:- name: flask-bookinfoimage: kubernetes-register.sswang.com/sswang/flask_bookinfo:2.3.2imagePullPolicy: Alwaysports:- containerPort: 5000env:- name: DB_HOSTvalue: "ex-mysql"- name: DB_USERvalue: "root"- name: DB_PASSWORDvalue: "123456"- name: DB_DATABASEvalue: "bookinfo"