mongo 主从仲裁

参考资料：https://www.cnblogs.com/xiangnanxiao/p/15273224.html

创建路径：

mkdir /home/mongodb/master/configdb
mkdir /home/mongodb/master/db
 
mkdir /home/mongodb/slave/configdb
mkdir /home/mongodb/slave/db
 
mkdir /home/mongodb/arditer/configdb
mkdir /home/mongodb/arditer/db

创建配置文件(三个配置文件保持一致，如果在同一个服务器中一份文件即可)

vi /home/mongodb/master/configdb/mongod.conf

net:
#启动端口
port: 27017
#允许连接的IP(0.0.0.0作用与--bind_ip_all类似)
bindIp: 0.0.0.0
systemLog:
#重新启动mongodb的时候日志拼接在以前的日志文件上
logAppend: true
security:
#路径是容器映射到宿主机的路径
keyFile: "/data/configdb/mongodbKeyfile.key"
#开启客户端连接认证 disabled 关闭授权
authorization: "enabled"
replication:
replSetName: "mongo_rs"

cp /home/mongodb/master/configdb/mongod.conf /home/mongodb/slave/configdb/
cp /home/mongodb/master/configdb/mongod.conf /home/mongodb/arditer/configdb/

生成key文件(需要注意三个都需要用同一个文件，否则会出现验证失败的情况)

openssl rand -base64 756 > /home/mongodb/master/configdb/mongodbKeyfile.key
#key文件必须设置成400,否则将会失败
chmod 400 /home/mongodb/master/configdb/mongodbKeyfile.key

cp /home/mongodb/master/configdb/mongodbKeyfile.key /home/mongodb/slave/configdb/
cp /home/mongodb/master/configdb/mongodbKeyfile.key /home/mongodb/arditer/configdb/

yaml文件：mongo.yaml

version: '3.7'
services:
rs1:
image: mongo:3.6
volumes:
- /home/mongodb/master/configdb/:/data/configdb/
- /home/mongodb/master/db/:/data/db/
command: mongod -f /data/configdb/mongod.conf
ports:
- "27110:27017"
rs2:
image: mongo:3.6
volumes:
- /home/mongodb/slave/configdb/:/data/configdb/
- /home/mongodb/slave/db/:/data/db/
command: mongod -f /data/configdb/mongod.conf
ports:
- "27111:27017"
rs3:
image: mongo:3.6
volumes:
- /home/mongodb/arditer/configdb/:/data/configdb/
- /home/mongodb/arditer/db/:/data/db/
command: mongod -f /data/configdb/mongod.conf
ports:
- "27112:27017"

docker-compose -f mongo.yaml -p mongo.yaml up -d

进入容器配置主从
docker exec -it mongoyaml_rs1_1 mongo admin
rs.initiate({_id:"mongo_rs",members:[{_id:0,host:"172.31.0.86:27110"},{_id:1,host:"172.31.0.86:27111"},{_id:2,host:"172.31.0.86:27112",arbiterOnly:true}]})

以上是配置主、从、仲裁的全部配置，以下则是配置权限

#切换至admin
use admin
#添加用户
db.createUser({user:'admin',pwd:'123456',roles:[{role:'root',db:'admin'}]})
#登录
db.auth('admin','123456')
 
添加测试数据：
use test
#给测试库添加数据
db.userinfo.insert({"name":"张三","sex":"男"})
db.userinfo.insert({"name":"wangwu","sex":"女"})

进入slave中查看是否已经同步数据

docker exec -it mongo_slave mongo admin
#切换至test库
use test
#登录
db.auth('admin','123456')
#设置备机可读
rs.slaveOk()
#查询数据
db.userinfo.find()

python脚本测试：

from pymongo import MongoClient
MONGO_POC_URI = 'mongodb://admin:123456@172.31.0.86:27110,172.31.0.86:27111,172.31.0.86:27112/admin?replicaSet=mongo_rs'
MONGO_POC_DB_ENV = 'test'
mongo_poc_client = MongoClient(MONGO_POC_URI, maxPoolSize=10,readPreference='secondaryPreferred')
mongo_poc_db = mongo_poc_client[MONGO_POC_DB_ENV]
ret = mongo_poc_db["userinfo"].find()
print(list(ret))
r=mongo_poc_db["userinfo"].insert_one({"name":"hello", "sex":"man"})
print(r.inserted_id)