Mongodb 3.0 Replica Set Setup with Docker Notes

gistfile1.txt

Reference: https://medium.com/@gargar454/deploy-a-mongodb-cluster-in-steps-9-using-docker-49205e231319#.ff9lbtdl9
this post talks about 3 Nodes，Mongodb 2.6.5. In order to use mongo 3.0, a few changes has been made. Assume using root

1. First we need 2 servers with docker installed

1.1 recommend use Ubuntu 14.04 on aliyun, then install daocloud for docker installation and monitoring

curl -sSL https://get.daocloud.io/docker | sh

1.2 install daocloud monitoring program
follow instruction on daocloud console

2. Find the two servers internal ip addresses if under the same PaaS provider and modify /etc/hosts on both servers
vi /etc/hosts
10.0.0.1     mongo-main
10.0.0.2     mongo-slave

3. Create a key file and put it on the same location of all servers
on main server:
cd /opt
openssl rand -base64 741 > mongodb-keyfile
chmod 600 mongodb-keyfile
chown 999 mongodb-keyfile
scp mongodb-keyfile root@10.0.0.2:/opt

then ssh to the other box and do:
chown 999 mongodb-keyfile

4. On main server, start mongodb container.
docker run --name mongo -v /data/mongo:/data/db --hostname="master.mongo.xxx.cn" -p 27017:27017 -d daocloud.io/mongo --storageEngine wiredTiger

5. Connect to the master mongo db to create admin user etc..

docker exec -it mongo /bin/bash
mongo
use admin
db.system.version.insert({ "_id" : "authSchema", "currentVersion" : 3 })
db.createUser( {
     user: "siteUserAdmin",
     pwd: "adminpassword",
     roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
   });
db.createUser( {
     user: "siteRootAdmin",
     pwd: "adminpassword",
     roles: [ { role: "root", db: "admin" } ]
   });
exit
exit

6. stop master mongo
docker stop mongo

7. Start master again with the keyfile

docker run --name mongo -v /data/mongo:/data/db -v /opt/mongodb-keyfile:/opt/mongodb-keyfile --hostname="master.mongo.xxx.cn" --add-host master.mongo.xxx.cn:10.0.0.1 --add-host slave.mongo.xxx.cn:10.0.0.2 -p 27017:27017 -d daocloud.io/mongo --keyFile /opt/mongodb-keyfile --replSet "meteor-rs" --storageEngine wiredTiger

8. Connect to the replica set and configure it. Still on master node.
Keep one ssh window tailing on the master docker log
docker logs -f mongo

Now start another ssh window to connect to the replica set
docker exec -it mongo /bin/bash
mongo
use admin
db.auth("siteRootAdmin", "adminpassword");
rs.initiate()

9. Verify the initial replica set configuration
rs.conf()

10. Start Mongo on slave
mkdir -p /data/mongo
docker run --name mongo -v /data/mongo:/data/db -v /opt/mongodb-keyfile:/opt/mongodb-keyfile --hostname="slave.mongo.xxx.cn" --add-host master.mongo.xxx.cn:10.0.0.1 --add-host slave.mongo.xxx.cn:10.0.0.2 -p 27017:27017 -d daocloud.io/mongo --keyFile /opt/mongodb-keyfile --replSet "meteor-rs" --storageEngine wiredTiger

11. Add slave to the replica set
back to master node
docker exec -it mongo /bin/bash
mongo
use admin
db.auth("siteRootAdmin", "adminpassword");
rs.add("slave.mongo.xxx.cn");
rs.status()

12. To allow querying on slave
on slave mongo shell
rs.slaveOk()

13. Create new user to access other db
use dbname
db.createUser( {
     user: "admin",
     pwd: "password",
     roles: [{"role": "readWrite", "db": "dbname"}]
});

use dbname
db.createUser( {
     user: "admin",
     pwd: "password",
     roles: [{"role": "readWrite", "db": "dbname"}]
});

14. restore mongodb
mongorestore -u admin -p password -d dbname mongodb-2015-11-03-1400/db/