java - 如何使用 Envoy 作为 Java Web 服务的负载均衡器？

Question

我正在尝试将 Envoy 设置为 Java 应用程序的负载平衡器。以下是我尝试实现的设置。

我关注了Envoy Tutorial得到一些想法并找到了代码。在那里，他们使用前端特使容器作为单个前端服务，在许多后端容器之间分配流量。但是对于我的工作，我不需要这样的前端容器。所以我修改了代码，以下是我创建的文件。

服务特使.yaml

static_resources:
  listeners:
  - address:
      socket_address:
        address: 0.0.0.0
        port_value: 80
    filter_chains:
    - filters:
      - name: envoy.http_connection_manager
        config:
          codec_type: auto
          stat_prefix: ingress_http
          route_config:
            name: local_route
            virtual_hosts:
            - name: service
              domains:
              - "*"
              routes:
              - match:
                  prefix: "/service"
                route:
                  cluster: local_service
          http_filters:
          - name: envoy.router
            config: {}
  clusters:
  - name: local_service
    connect_timeout: 0.25s
    type: strict_dns
    lb_policy: round_robin
    hosts:
    - socket_address:
        address: 127.0.0.1
        port_value: 9000
admin:
  access_log_path: "/dev/null"
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 8081

Dockerfile 服务

FROM envoyproxy/envoy-alpine:latest
FROM java:8

ADD gs-actuator-service-0.1.0.jar gs-actuator-service-0.1.0.jar

ADD ./start_service.sh /usr/local/bin/start_service.sh
RUN chmod u+x /usr/local/bin/start_service.sh
ENTRYPOINT /usr/local/bin/start_service.sh

启动服务.sh

#!/bin/sh

java -jar gs-actuator-service-0.1.0.jar &
envoy -c /etc/service-envoy.yaml --service-cluster service${SERVICE_NAME}

docker-compose.yml

version: '2'
services:

  service1:
    build:
      context: .
      dockerfile: Dockerfile-service
    volumes:
      - ./service-envoy.yaml:/etc/service-envoy.yaml
    networks:
      envoymesh:
        aliases:
          - service1
    environment:
      - SERVICE_NAME=1
    expose:
      - "80"

networks:
  envoymesh: {}

gs-actuator-service-0.1.0.jar 是包含网络服务的 jar 文件。在本地运行时，可以使用

调用

localhost:9000/prime?number=10

当我运行时

sudo docker-compose up --build

它给出以下输出，最后有一行错误。

Building service1
Step 1/6 : FROM envoyproxy/envoy-alpine:latest
 ---> 44b4a2e0acd8
Step 2/6 : FROM java:8
 ---> d23bdf5b1b1b
Step 3/6 : ADD gs-actuator-service-0.1.0.jar gs-actuator-service-0.1.0.jar
 ---> fee1f402b547
Step 4/6 : ADD ./start_service.sh /usr/local/bin/start_service.sh
 ---> 52c2cc17c4dd
Step 5/6 : RUN chmod u+x /usr/local/bin/start_service.sh
 ---> Running in 95ee0537c3d1
Removing intermediate container 95ee0537c3d1
 ---> d8e9bdb2f95e
Step 6/6 : ENTRYPOINT /usr/local/bin/start_service.sh
 ---> Running in 27b20f261c0f
Removing intermediate container 27b20f261c0f
 ---> 26080be0b5ea
Successfully built 26080be0b5ea
Successfully tagged frontproxy_service1:latest
Recreating frontproxy_service1_1 ... 
Recreating frontproxy_service1_1 ... done
Attaching to frontproxy_service1_1
service1_1  | /usr/local/bin/start_service.sh: 3: 
/usr/local/bin/start_service.sh: envoy: not found
frontproxy_service1_1 exited with code 127

谁能指出我哪里错了？

谢谢

Answer 1

你在 Windows 上吗？如果是，请使用 Notepad++ 检查所有文件，然后在右下角可以将 CR LF 更改为 LF。在所有文件中更改它，保存它并尝试再次运行它。