[Container] 3 Tier(Kubernetes)

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3계층 아키텍처 구성

mysql 이미지를 이용해서 DB서버 설정(시크릿, 볼륨, 파드, 서비스(클러스터IP))
tomcat 이미지를 이용해서 was 서버 설정(파드, 서비스(클러스터IP))
httpd 서비스를 이용해서 web 서버 설정(파드, 서비스(로드밸런서))
각 서버의 이중화 구성은 하지말고 1대씩만 설정

DB 설정

시크릿 생성

apiVersion: v1
kind: Secret
metadata:
name: mysql-sec
data:
MYSQL_ROOT_PASSWORD: cXdlcjEyMzQ=

pv 생성 ```yaml apiVersion: v1 kind: PersistentVolume metadata: name: mysql-pv spec: capacity: storage: 10G accessModes:
- ReadWriteOnce local: path: /mysql-volume nodeAffinity: required: nodeSelectorTerms:
  - matchExpressions:
    - {key: kubernetes.io/hostname, operator: In, values: [node1]} ```
pvc 생성 ```yaml apiVersion: v1 kind: PersistentVolumeClaim metadata: name: mysql-pvc spec: accessModes:
- ReadWriteOnce resources: requests: storage: 10G storageClassName: “” ```
sql 파드 생성 ```yaml apiVersion: v1 kind: Pod metadata: name: mysql-pod labels: type: db spec: nodeSelector: kubernetes.io/hostname: node1 containers:
- name: container image: mysql:latest ports:
  - containerPort: 3306 envFrom:
  - secretRef: name: mysql-sec volumeMounts:
  - name: mysql-pvc-pv mountPath: /var/lib/mysql volumes:
- name : mysql-pvc-pv persistentVolumeClaim: claimName: mysql-pvc ```
node1에 퍼시스턴트 볼륨 디렉토리 생성
```
cd /
mkdir mysql-volume
```
서비스(클러스터IP) ```yaml apiVersion: v1 kind: Service metadata: name: mysql-svc spec: selector: type: db ports:
- port: 3306 targetPort: 3306 ```

확인
master

yum install -y mysql-server
mysql -u root -p -h 10.99.38.110 # 서비스의 아이피, 비밀번호를 치고 들어가지면 성공

sql db 및 테이블 생성

CREATE DATABASE kjh_db;
use kjh_db;
CREATE TABLE student (sname VARCHAR(10), sage INT);
INSERT INTO student VALUES('kim',10);
INSERT INTO student VALUES('lee',20);
INSERT INTO student VALUES('park',30);
INSERT INTO student VALUES('sim',40);

tomcat 설정

도커 파일 생성
master

mkdir tomcat
cd tomcat
wget wget https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.19.tar.gz
tar zxvf mysql-connector-java-8.0.19.tar.gz
vi Dockerfile

FROM tomcat:9.0
RUN rm -rf /usr/local/tomcat/conf/server.xml
ADD ./server.xml /usr/local/tomcat/conf/server.xml
RUN mkdir /usr/local/tomcat/webapps/kjh
ADD ./test.jsp /usr/local/tomcat/webapps/kjh/test.jsp
ADD ./mysql-connector-java-8.0.19/mysql-connector-java-8.0.19.jar /usr/local/tomcat/lib/mysql-connector-java-8.0.19.jar
EXPOSE 8080
EXPOSE 8009
CMD catalina.sh run

톰캣에 db연결하기
```
vi server.xml
```

https://github.com/xc7230/Cloud/blob/main/kubernetes_3tier/tomcat/server.xml 참조

테스트용 jsp만들기

vi test.jsp

<%@page import="java.sql.*"%>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		Connection conn = null;
		ResultSet rs = null;
	      
		String url = "jdbc:mysql://mysql-svc:3306/kjh_db?serverTimezone=UTC";
		String id = "root";
		String pwd = "qwer1234";


		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection(url, id, pwd);
			Statement stmt = conn.createStatement();
     
	
			String sql = "SELECT sname FROM student";
			rs = stmt.executeQuery(sql);
			
			while(rs.next()) {
				out.println(rs.getString("sname"));
			}


			conn.close();
		} catch (Exception e) {

			e.printStackTrace();
		}	
	%>
</body>
</html>

이미지 생성

docker build --tag xc7230/tomcat:0.1 .
docker push xc7230/tomcat:0.1

톰캣 파드 생성 ```yaml apiVersion: v1 kind: Pod metadata: name: tomcat-pod labels: type: was spec: containers:
- name: container image: xc7230/tomcat:0.6 ports:
  - containerPort: 8009 ```
톰캣 서비스 ```yaml apiVersion: v1 kind: Service metadata: name: tomcat-svc spec: selector: type: was ports:
- port: 8009 targetPort: 8009 ```
확인
```
curl 192.168.104.7:8080/test.jsp
```

httpd 설정

master

mkdir httpd
cd httpd
vi Dockerfile

Dockerfile 작성

FROM httpd:2.4
ADD ./test.html /usr/local/apache2/htdocs/test.html
RUN apt update
RUN apt install -y libapache2-mod-jk
RUN cp /usr/lib/apache2/modules/mod_jk.so /usr/local/apache2/modules/mod_jk.so
RUN sed -i 's/localhost/tomcat-svc/g' /etc/libapache2-mod-jk/workers.properties
RUN rm -rf /usr/local/apache2/conf/httpd.conf
ADD ./httpd.conf /usr/local/apache2/conf/httpd.conf
EXPOSE 80
CMD httpd-foreground

test 화면 작성
```
vi test.html
```
```html

test

- httpd.conf 파일 수정<br/>
https://github.com/xc7230/Cloud/blob/main/kubernetes_3tier/http/httpd.conf 참조
```conf
LoadModule jk_module modules/mod_jk.so
	
<IfModule jk_module>
	JkWorkersFile /etc/libapache2-mod-jk/workers.properties
	JkLogFile /usr/local/apache2/logs/mod_jk.log
	JkLogLevel info
	JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"
	JkMount /*.jsp ajp13_worker
	JkShmFile /usr/local/apache2/logs/jk-runtime-status
</IfModule>
# 마지막에 추가

이미지 파일 업로드

docker build --tag xc7230/httpd:0.1 .
docker push xc7230/httpd:0.1

파드 생성 ```yaml apiVersion: v1 kind: Pod metadata: name: httpd-pod labels: type: web spec: containers:
- name: container image: xc7230/httpd:0.2 ports:
  - containerPort: 80 ```
서비스 생성 ```yaml apiVersion: v1 kind: Service metadata: name: httpd-svc spec: selector: type: web ports:
- port: 80 targetPort: 80 type: LoadBalancer ```

확인

curl 192.168.104.8/test.html
curl 192.168.104.8/test.jsp

서비스 ```yaml apiVersion: v1 kind: Service metadata: name: httpd-svc spec: selector: type: web ports:
- port: 80 targetPort: 80 type: LoadBalancer ```
확인
다음 url을 참조하여
http://192.168.197.221/test.jsp 접속

다음 화면처럼 was에 만들어 놨던 test.jsp가 실행되고 안에 DB정보가 나오면 성공적이다.

설정 파일 웹서버에서 불러오기

tomcat Dockerfile

FROM tomcat:9.0
RUN rm -rf /usr/local/tomcat/conf/server.xml
RUN mkdir /usr/local/tomcat/webapps/kjh
ADD ./mysql-connector-java-8.0.19/mysql-connector-java-8.0.19.jar /usr/local/tomcat/lib/mysql-connector-java-8.0.19.jar
EXPOSE 8080
EXPOSE 8009
CMD wget http://192.168.197.1:1234/test.jsp -O /usr/local/tomcat/webapps/kjh/test.jsp && wget http://192.168.197.1:1234/server.xml -O /usr/local/tomcat/conf/server.xml && catalina.sh run

httpd Dockerfile

FROM httpd:2.4
ADD ./test.html /usr/local/apache2/htdocs/test.html
RUN apt update
RUN apt install -y libapache2-mod-jk wget
RUN cp /usr/lib/apache2/modules/mod_jk.so /usr/local/apache2/modules/mod_jk.so
RUN sed -i 's/localhost/tomcat-svc/g' /etc/libapache2-mod-jk/workers.properties
RUN rm -rf /usr/local/apache2/conf/httpd.conf
EXPOSE 80
CMD wget http://192.168.197.1:1234/test.html -O /usr/local/apache2/htdocs/test.html && wget http://192.168.197.1:1234/httpd.conf -O /usr/local/apache2/conf/httpd.conf && httpd-foreground

apt update가 안될때는

docker build --no-cache --tag [태그명] # 빌드할때 다음 명령어 추가

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Kim JungHyun

[Container] 3 Tier(Kubernetes)

3계층 아키텍처 구성

DB 설정

tomcat 설정

httpd 설정

test

설정 파일 웹서버에서 불러오기

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