关于docker:docker-搭一个mongodb-shard-cluster

本文依照mongodb网站上的领导教程应用docker搭建了一个shard集群，仅供学习参考。

有如下目录构造：

.├── docker-compose.yaml└── shard-setup    └── setup.sh

其中，docker-compose.yaml内容如下：

version: "3.8"services:  mongos-1:    hostname: mongos-1    container_name: mongos-1    image: mongo:5.0.0    entrypoint: /usr/bin/bash /shard-setup/setup.sh    volumes:       - ./shard-setup:/shard-setup    networks:       - mongo-shard-net    restart: on-failure    depends_on:       - cfgrs0-1      - cfgrs0-2      - cfgrs0-3      - dbrs0-1      - dbrs0-2      - dbrs0-3      - dbrs1-1      - dbrs1-2      - dbrs1-3  cfgrs0-1:    hostname: cfgrs0-1    container_name: cfgrs0-1    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --configsvr --replSet "cfgrs0" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27019"  cfgrs0-2:    hostname: cfgrs0-2    container_name: cfgrs0-2    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --configsvr --replSet "cfgrs0" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27019"  cfgrs0-3:    hostname: cfgrs0-3    container_name: cfgrs0-3    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --configsvr --replSet "cfgrs0" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27019"  # 配置dbrs0和dbrs1  dbrs0-1:    hostname: dbrs0-1    container_name: dbrs0-1    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --shardsvr --replSet "dbrs0" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27018"  dbrs0-2:    hostname: dbrs0-2    container_name: dbrs0-2    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --shardsvr --replSet "dbrs0" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27018"  dbrs0-3:    hostname: dbrs0-3    container_name: dbrs0-3    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --shardsvr --replSet "dbrs0" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27018"  dbrs1-1:    hostname: dbrs1-1    container_name: dbrs1-1    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --shardsvr --replSet "dbrs1" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27018"  dbrs1-2:    hostname: dbrs1-2    container_name: dbrs1-2    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --shardsvr --replSet "dbrs1" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27018"  dbrs1-3:    hostname: dbrs1-3    container_name: dbrs1-3    image: mongo:5.0.0    entrypoint: /usr/bin/mongod --shardsvr --replSet "dbrs1" --bind_ip_all    networks:       - mongo-shard-net    restart: on-failure    expose:       - "27018"networks:   mongo-shard-net:    name: mongo-shard-net

setup.sh用于设置config以及shard主从，最初作为mongos运行，内容如下：

#/bin/bashCFGRS0_NAME=cfgrs0CFGRS0_REPLICA_1=${CFGRS0_NAME}-1CFGRS0_REPLICA_2=${CFGRS0_NAME}-2CFGRS0_REPLICA_3=${CFGRS0_NAME}-3CFGSVR_PORT=27019DBRS0_NAME=dbrs0DBRS0_REPLICA_1=${DBRS0_NAME}-1DBRS0_REPLICA_2=${DBRS0_NAME}-2DBRS0_REPLICA_3=${DBRS0_NAME}-3DBRS1_NAME=dbrs1DBRS1_REPLICA_1=${DBRS1_NAME}-1DBRS1_REPLICA_2=${DBRS1_NAME}-2DBRS1_REPLICA_3=${DBRS1_NAME}-3DBSVR_PORT=27018until mongosh --host ${CFGRS0_REPLICA_1} --port ${CFGSVR_PORT} <<EOFexitEOFdo  sleep 5donemongosh --host ${CFGRS0_REPLICA_1} --port ${CFGSVR_PORT} <<EOFrs.initiate(  {    _id: "${CFGRS0_NAME}",    configsvr: true,    members: [      { _id : 0, host : "${CFGRS0_REPLICA_1}:${CFGSVR_PORT}", priority: 2 },      { _id : 1, host : "${CFGRS0_REPLICA_2}:${CFGSVR_PORT}", priority: 1 },      { _id : 2, host : "${CFGRS0_REPLICA_3}:${CFGSVR_PORT}", priority: 1 }    ]  })EOFfor rs in 0 1do    until mongosh --host `eval echo '$'{DBRS"${rs}"_REPLICA_1}` --port ${DBSVR_PORT} <<EOFexitEOF  do    sleep 5  donemongosh --host `eval echo '$'{DBRS"${rs}"_REPLICA_1}` --port ${DBSVR_PORT} <<EOFrs.initiate(  {    _id: "eval echo '$'{DBRS"${rs}"_NAME}",    members: [      { _id : 0, host : "`eval echo '$'{DBRS"${rs}"_REPLICA_1}`:${DBSVR_PORT}", priority: 2 },      { _id : 1, host : "`eval echo '$'{DBRS"${rs}"_REPLICA_2}`:${DBSVR_PORT}", priority: 1 },      { _id : 2, host : "`eval echo '$'{DBRS"${rs}"_REPLICA_3}`:${DBSVR_PORT}", priority: 1 }    ]  })EOFdonemongos --configdb ${CFGRS0_NAME}/${CFGRS0_REPLICA_1}:${CFGSVR_PORT},\${CFGRS0_REPLICA_2}:${CFGSVR_PORT},${CFGRS0_REPLICA_3}:${CFGSVR_PORT} \--bind_ip_all

应用docker-compose up即可启动集群，应用docker-compose down --volumes即可进行集群。

PS：仅应用docker-compose down可能会以致磁盘空间一直减小，每次挂载的volume在/var/lib/docker目录下会越积越多。