本地使用 docker-componse 搭建 mongodb 3 節點集羣[1主2輔，自動切換主備，可改成真實異地物理節點]

本地使用 docker-componse 搭建 mongodb 3 節點集羣[1主2輔，自動切換主備，可改成真實異地物理節點]

支持：在另外一個 docker-componse app 內訪問集羣

支持：在宿主機訪問集羣

事務功能須要集羣

讀寫分離，異地容災

mongo 集羣搭建

docker-compose.yml

version: '3'
services:
  mongo1:
    hostname: mongo1
    container_name: localmongo1
    image: mongo
    restart: always
    expose:
      - 27017
    ports:
      - 27017:27017
    command: '--quiet --bind_ip_all --port 27017 --replSet rs0'
    volumes:
      - ./db1/mongo:/data/db
    #environment:
      #MONGO_INITDB_ROOT_USERNAME: root
      #MONGO_INITDB_ROOT_PASSWORD: root
    networks:
      - default
      - nginx-proxy

  mongo2:
    hostname: mongo2
    container_name: localmongo2
    image: mongo
    restart: always
    expose:
      - 27018
    ports:
      - 27018:27018
    command: '--quiet --bind_ip_all --port 27018 --replSet rs0'
    volumes:
      - ./db2/mongo:/data/db
    #depends_on:
      #- mongo1
    networks:
      - default
      - nginx-proxy

  mongo3:
    hostname: mongo3
    container_name: localmongo3
    image: mongo
    restart: always
    expose:
      - 27019
    ports:
      - 27019:27019
    command: '--quiet --bind_ip_all --port 27019 --replSet rs0'
    volumes:
      - ./db3/mongo:/data/db
    #depends_on:
      #- mongo2
    networks:
      - default
      - nginx-proxy

  rsinit:
    build:
      context: .
      dockerfile: rsinit
    depends_on:
      - mongo1
      - mongo2
      - mongo3
    entrypoint: ["sh", "-c", "rs.sh"]
    networks:
      - default
      - nginx-proxy

networks:
  nginx-proxy:
    external: true

rs.sh

#!/bin/bash

echo "prepare rs initiating"

check_db_status() {
  mongo1=$(mongo --host mongo1 --port 27017 --eval "db.stats().ok" | tail -n1 | grep -E '(^|\s)1($|\s)')
  mongo2=$(mongo --host mongo2 --port 27018 --eval "db.stats().ok" | tail -n1 | grep -E '(^|\s)1($|\s)')
  mongo3=$(mongo --host mongo3 --port 27019 --eval "db.stats().ok" | tail -n1 | grep -E '(^|\s)1($|\s)')
  if [[ $mongo1 == 1 ]] && [[ $mongo2 == 1 ]] && [[ $mongo3 == 1 ]]; then
    init_rs
  else
    check_db_status
  fi
}

init_rs() {
  ret=$(mongo --host mongo1 --port 27017 --eval "rs.initiate({ _id: 'rs0', members: [{ _id: 0, host: 'mongo1:27017' }, { _id: 1, host: 'mongo2:27018' }, { _id: 2, host: 'mongo3:27019' } ] })" > /dev/null 2>&1)
}

check_db_status > /dev/null 2>&1

echo "rs initiating finished"
exit 0

rsinit

FROM mongo

ADD rs.sh /usr/local/bin/

RUN chmod +x /usr/local/bin/rs.sh

運行

docker-compose up --build

中止

docker-compose down

---

在宿主機訪問集羣

在本機 host 文件添加解析

127.0.0.1       mongo1
127.0.0.1       mongo2
127.0.0.1       mongo3

訪問集羣的鏈接地址

mongodb://mongo1:27017,mongo2:27018,mongo3:27019/?replicaSet=rs0

可選的配置

mongodb://mongo1:27017,mongo2:27018,mongo3:27019/?replicaSet=rs0&slaveOk=true&authSource=admin&readPreference=secondaryPreferred&w=majority&ssl=false

MongoDB Composs 鏈接成功會顯示爲3節點集羣

---

在其餘 docker-componse 開啓的 app 容器內訪問集羣

Dockerfile

FROM node:12.13.1-alpine3.10

MAINTAINER black

#RUN apk add --no-cache curl

# create a specific user to run this container
#RUN adduser -S -D user-app

# add files to container
#ADD . /app

# specify the working directory
WORKDIR /app

RUN chmod -R 777 /app

# build process

#RUN npm install
#RUN npm run build
#RUN npm prune --production

# run the container using a specific user
#USER user-app

#EXPOSE 8080

# run application
#CMD ["npm", "start"]

docker-compose.yml

version: '3.7'

services:
  graphql:
    build:
      context: ./
      dockerfile: Dockerfile
    command: 'npm run start'
    #environment:
      #UV_THREADPOOL_SIZE: 128
      #NODE_APP_INSTANCE: 0
      #NODE_ENV: docker
      #DB_URL: postgres://root:123@postgres/project
    expose:
      - 4000
    ports:
      - "80:4000"
    volumes:
      #- ./:/usr/src/app/
      - ./:/app/
    networks:
      - default
      - nginx-proxy

networks:
  nginx-proxy:
    external: true

運行

docker-compose up --build

中止

docker-compose down

原文地址 : https://github.com/WangShuXia...