Monogodb复制(副本集)配置

1) 规划

三台服务器    一主一从一仲裁
cat >> /etc/hosts <<EOF
192.168.192.100  node1
192.168.192.101  node2
192.168.192.102  node3
EOF

mkdir /data/mongodb/{etc,log,data} -p

2)配置

tar -xf mongodb-linux*.taz
cd mongodb-linux*
cp -r bin  /data/mongodb/

cat > /data/mongodb/etc/mongodb.conf<<EOF 
systemLog:
  destination: file
  path: /data/mongodb/log/mongodb.log   
  logAppend: true
storage:
  journal:
    enabled: true
  dbPath: /data/mongodb/data
  directoryPerDB: true
  #engine: wiredTiger
  wiredTiger:
    engineConfig:
      cacheSizeGB: 1
      directoryForIndexes: true
    collectionConfig:
      blockCompressor: zlib
    indexConfig:
      prefixCompression: true
net:
  bindIp: 192.168.192.100,127.0.0.1
  port: 27017
replication:
  oplogSizeMB: 2048
  replSetName: sh1
#sharding:
#  clusterRole: shardsvr
processManagement: 
  fork: true
EOF

3) 启动副本集、

/data/mongodb/bin/mongo --port 27017 admin

config = {_id: 'sh1', members: [
                          {_id: 0, host: 'node1:27017'},
                          {_id: 1, host: 'node2:27017'},
                          {_id: 2, host:'node3:27017',"arbiterOnly":true}]
           }

rs.initiate(config)

或
rs.initiate()
rs.add("node2:27017")
rs.addArb("node3:27017")

4) 修改权重

rs.config()  # 查看索引顺序

cfg = rs.config()  # 获取副本集的配置，默认权重都是1

cfg.members[0].priority = 100  # 把索引为0的机器的权重变为100
cfg.members[1].priority = 50  # 把索引为1的机器的权重变为50

rs.reconfig(cfg)  # 更新mongodb副本集的配置