docker篇-(docker-compose搭建高可用Eureka集群)

心已赠人 2022-11-18 01:47 229阅读 0赞

### docker-compose安装高可用Eureka集群 ###

*  构建Eureka注册中心镜像
 *  搭建集群
 *  通过nginx实现负载均衡
 *  配置nginx ssl支持
 *  注册product和consumer测试是否可用

# 构建Eureka注册中心镜像 #

eureka项目来自于我之前写的一篇博客,博客地址: [springcloud篇-(高可用注册中心Eureka集群实现)][springcloud_-_Eureka]  
1.修改原项目中的application.yml配置

server:
      port: 8761
    eureka:
      auth:
        enable: ${ EUREKA_AUTH_ENABLE:false} #将认证相关的配置，通过这种方式来设置，方便在docker中通过环境变量来改变这些参数
        username: ${ EUREKA_AUTH_USERNAME:root}
        password: ${ EUREKA_AUTH_PASSWORD:123456}
      server:
        eviction-interval-timer-in-ms: 60000 #驱逐下线服务的间隔时间
        enable-self-preservation: ${ EUREKA_ENABLE_SELF_PRESERVATION:false} #关闭eureka服务自我保护机制，使eviction-interval-timer-in-ms配置生效
      instance:
        health-check-url-path: /actuator/health #健康检查地址
        prefer-ip-address: true #显示ip地址
        hostname: ${ EUREKA_HOSTNAME:localhost}
      client:
        fetch-registry: false #注册中心不需要拉取服务
        register-with-eureka: false #使用高可用集群搭建，设置为false即可
        service-url:
          defaultZone: ${ EUREKA_SERVER_LIST:http://localhost:8761/eureka} #注册中心地址
    spring:
      application:
        name: eureka-server

2.将项目打包上传到centos  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][2021041117110342.png]  
3.编写Dockerfile文件

cat > Dockerfile <<EOF FROM adoptopenjdk/openjdk11:x86_64-alpine-jre-11.0.9_11 # dockerfile维护人员 MAINTAINER lhstack@foxmail.com #定义标签 LABEL version=0.0.1 LABEL gitee="https://gitee.com/myprofile" # jvm参数 ENV JVM_OPTS "-Xmx128m -Xms128m -Xmn32m -Xss512k -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\$WORKDIR/error -Duser.timezone=Asia/Shanghai" # 项目参数 ENV JAVA_OPTS "" ENV WORKDIR "/opt/eureka" #挂载error目录 VOLUME /opt/eureka/error # 配置时区 RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \\ && apk update \\ && apk add --no-cache tzdata \\ && cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime # 设置时区 ENV TZ Asia/Shanghai # 设置工作目录 WORKDIR \$WORKDIR # 将tomcat拷贝到工作目录 ADD *.jar app.jar # 暴露端口 EXPOSE 8761 # 启动eureka CMD java \$JVM_OPTS \$JAVA_OPTS -jar app.jar EOF

4.构建eureka镜像

docker build -t eureka:0.0.1-alpine .

5.运行镜像

docker run --rm -ti -p 8761:8761 eureka:0.0.1-alpine

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 1]  
通过浏览器访问  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 2]

# 搭建集群 #

1.编写eureka集群的环境变量

mkdir env 
    cat > env/eureka.env <<EOF EUREKA_AUTH_ENABLE=true EUREKA_AUTH_USERNAME=admin EUREKA_AUTH_PASSWORD=123456 EUREKA_HOSTNAME=\${hostname} EUREKA_SERVER_LIST="http://admin:123456@eureka-1:8761/eureka,http://admin:123456@eureka-2:8761/eureka,http://admin:123456@eureka-3:8761/eureka" EOF

2.编写docker-compose.yaml文件

cat > docker-compose.yaml <<EOF version: '3' services: eureka-1: image: eureka:0.0.1-alpine build: . ports: - 8761:8761 container_name: eureka-1 env_file: - ./env/eureka.env hostname: eureka-1 networks: - eureka eureka-2: image: eureka:0.0.1-alpine ports: - 8762:8761 container_name: eureka-2 env_file: - ./env/eureka.env hostname: eureka-2 networks: - eureka eureka-3: image: eureka:0.0.1-alpine ports: - 8763:8761 container_name: eureka-3 env_file: - ./env/eureka.env hostname: eureka-3 networks: - eureka networks: eureka: driver: bridge ipam: driver: default config: - subnet: "10.10.0.0/16" EOF

3.执行docker-compose并通过浏览器访问对应端口的eureka应用  
第一个  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 3]  
第二个  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 4]  
第三个  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 5]  
可以看到，上面指向的eureka高可用集群开发的那篇博客里面，集群页面是没有Ds Replicas的，是因为那篇博客里面的hostname都是localhost，所以eureka无法区分出来副本，实际上是不影响的

# 通过nginx实现负载均衡 #

1.生成nginx配置

mkdir conf
    cat > ./conf/eureka.conf <<EOF upstream eureka-cluster{ server eureka-1:8761 weight=1; server eureka-2:8761 weight=1; server eureka-3:8761 weight=1; } server { listen 80; server_name localhost; location / { proxy_set_header X-Real-IP \$remote_addr; # 将客户端真实ip存放到X-Real-IP这个header里面,由于这里是没有使用host模式启动nginx，获取的会是宿主机的ip proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for; # 每经过一个反向代理，就会把反向代理IP存放在X-Forwarded-For里 proxy_pass http://eureka-cluster; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } } EOF

2.修改docker-compose.yaml，添加nginx进去

cat > docker-compose.yaml <<EOF version: '3' services: eureka-lb: image: nginx:alpine container_name: eureka-lb ports: - 8080:80 volumes: - ./conf:/etc/nginx/conf.d depends_on: - eureka-1 - eureka-2 - eureka-3 networks: - eureka eureka-1: image: eureka:0.0.1-alpine build: . container_name: eureka-1 env_file: - ./env/eureka.env hostname: eureka-1 networks: - eureka eureka-2: image: eureka:0.0.1-alpine container_name: eureka-2 env_file: - ./env/eureka.env hostname: eureka-2 networks: - eureka eureka-3: image: eureka:0.0.1-alpine container_name: eureka-3 env_file: - ./env/eureka.env hostname: eureka-3 networks: - eureka networks: eureka: driver: bridge ipam: driver: default config: - subnet: "10.10.0.0/16" EOF

3.通过浏览器访问  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 6]

# 配置nginx ssl支持 #

1.下载cfssl证书生成工具

wget -O /usr/local/sbin/certinfo https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 && chmod +x /usr/local/sbin/certinfo
    wget -O /usr/local/sbin/cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 && chmod +x /usr/local/sbin/cfssl
    wget -O /usr/local/sbin/cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 && chmod +x /usr/local/sbin/cfssljson

2.生成证书

mkdir ssl && cd ssl
    cat > ca-config.json <<EOF { "signing": { "default": { "expiry": "876000h" }, "profiles": { "eureka": { "expiry": "876000h", "usages": [ "signing", "key encipherment", "server auth" ] } } } } EOF
    
    cat > ca-csr.json <<EOF { "CN": "www.eureka.com.cn", "hosts": [ ], "key": { "algo": "ecdsa", "size": 256 }, "names": [ { "C": "US", "L": "CA", "ST": "San Francisco" } ] } EOF
    #生成ca根证书
    cfssl gencert -initca ca-csr.json | cfssljson -bare ca
    cat > server-csr.json <<EOF { "CN": "www.eureka.com.cn", "hosts": [ ], "key": { "algo": "ecdsa", "size": 256 }, "names": [ { "C": "US", "L": "CA", "ST": "San Francisco" } ] } EOF
    #生成服务端证书
    cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=eureka server-csr.json | cfssljson -bare server
    cd ..

3.修改nginx的配置文件

cat > ./conf/eureka.conf <<EOF upstream eureka-cluster{ server eureka-1:8761 weight=1; server eureka-2:8761 weight=1; server eureka-3:8761 weight=1; } server { listen 443 ssl http2 default_server; server_name www.eureka.com.cn [::]:443 ssl http2 default_server; ssl_certificate /opt/ssl/eureka/server.pem; # pem文件的路径 ssl_certificate_key /opt/ssl/eureka/server-key.pem; # key文件的路径 ssl_session_timeout 5m; #缓存有效期 ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4; #加密算法 ssl_protocols TLSv1 TLSv1.1 TLSv1.2; #安全链接可选的加密协议 ssl_prefer_server_ciphers on; #使用服务器端的首选算法 location / { proxy_set_header X-Real-IP \$remote_addr; # 将客户端真实ip存放到X-Real-IP这个header里面,由于这里是没有使用host模式启动nginx，获取的会是宿主机的ip proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for; # 每经过一个反向代理，就会把反向代理IP存放在X-Forwarded-For里 proxy_pass http://eureka-cluster; } } EOF

4.修改docker-compose.yml

cat > docker-compose.yaml <<EOF version: '3' services: eureka-lb: image: nginx:alpine container_name: eureka-lb ports: - 8443:443 volumes: - ./conf:/etc/nginx/conf.d - ./ssl:/opt/ssl/eureka depends_on: - eureka-1 - eureka-2 - eureka-3 networks: - eureka eureka-1: image: eureka:0.0.1-alpine build: . container_name: eureka-1 env_file: - ./env/eureka.env hostname: eureka-1 networks: - eureka eureka-2: image: eureka:0.0.1-alpine container_name: eureka-2 env_file: - ./env/eureka.env hostname: eureka-2 networks: - eureka eureka-3: image: eureka:0.0.1-alpine container_name: eureka-3 env_file: - ./env/eureka.env hostname: eureka-3 networks: - eureka networks: eureka: driver: bridge ipam: driver: default config: - subnet: "10.10.0.0/16" EOF

5.通过浏览器访问  
`注意:查看eureka启动日志，确认启动成功之后再访问`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 7]

# 注册product和consumer测试是否可用 #

1.因为eureka注册中心使用ssl进行代理，所以客户端注册的时候，需要配置证书信息

# 如果centos上面没有keytool工具，请用windows的，这里ca.pem就是nginx里面ssl目录下面的ca.pem文件
    keytool -import -noprompt -file ca.pem -keystore truststore.jks -storepass 123456
    # openssl在centos上是默认安装了的，这里我们导出server.pem相关文件格式为p12,pass:这里设置密码
    openssl pkcs12 -export -in server.pem -inkey server-key.pem -out keystore.p12 -passout pass:123456
    # 将p12格式证书导出成jks
    keytool -importkeystore -srckeystore keystore.p12 -srcstoretype PKCS12 -destkeystore keystore.jks -srcstorepass 123456 -deststorepass 123456

2.配置域名映射，因为客户端这边配置了证书之后，会验证域名，我们上面生成的证书文件域名为`www.eureka.com.cn`，因此我们添加一行域名映射  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 8]

3.打开之前的product和consumer两个项目，分别将生成的keystore.jks和truststore.jks复制到resources目录下面,并且修改application.yaml文件内容为  
Product

spring:
      application:
        name: Product
    eureka:
      instance:
        prefer-ip-address: true
        health-check-url-path: /actuator/health
      client:
        register-with-eureka: true
        fetch-registry: false #生产端不需要拉取服务
        service-url:
          defaultZone: https://admin:123456@www.eureka.com.cn:8443/eureka #新的注册中心地址
        tls: #证书相关
          enabled: true
          key-store: classpath:keystore.jks
          key-store-password: 123456
          key-password: 123456
          trust-store-password: 123456
          trust-store: classpath:truststore.jks
    server:
      port: 9090

Consumer

spring:
      application:
        name: Consumer
    eureka:
      instance:
        prefer-ip-address: true
        health-check-url-path: /actuator/health
      client:
        register-with-eureka: true
        fetch-registry: true #消费端需要发现服务
        service-url:
          defaultZone: https://admin:123456@www.eureka.com.cn:8443/eureka #注册中心地址
        tls:
          enabled: true
          key-store: classpath:keystore.jks
          key-store-password: 123456
          key-password: 123456
          trust-store-password: 123456
          trust-store: classpath:truststore.jks
    server:
      port: 8080

4.分别启动product和consumer，并查看注册中心是否存在实例  
因为eureka-server注册中心副本默认同步时间设置的是30s,所以服务注册上去之后，所有节点不是马上就会有最新的注册实例  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 9]  
5.访问Consumer，查看是否能调用生产者暴露的服务  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDEzMDEx_size_16_color_FFFFFF_t_70 10]

[springcloud_-_Eureka]: https://blog.csdn.net/qq_42413011/article/details/115591996
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[2021041117110342.png]: /images/20221022/690b331b8f334d35ab05c0d59ea8ab94.png
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