Mongo副本节点与docker

Question

I have setup a Mongo Primary node with docker using docker image https://hub.docker.com/_/mongo/ . Now I wish to add replica node in my current setup using docker only. Can anybody help me with this?

Answer 1

You could check a guide like " Deploy a MongoDB Cluster in 9 steps Using Docker ", but that involve multiple working docker servers.

It uses a key file key file to be used on all nodes ( openssl rand -base64 741 > mongodb-keyfile ) for internal authentication .
That allows to create an admin user, which then adds the replica servers:

docker run \
--name mongo \
-v /home/core/mongo-files/data:/data/db \
-v /home/core/mongo-files:/opt/keyfile \
--hostname="node1.example.com" \
--add-host node1.example.com:${node1} \
--add-host node2.example.com:${node2} \
--add-host node3.example.com:${node3} \
-p 27017:27017 -d mongo:2.6.5 \
--smallfiles \
--keyFile /opt/keyfile/mongodb-keyfile \
--replSet "rs0"

On each replica, you initiate and then check the config:

 rs.initiate()
 rs.conf()

Back to node 1, you declare the replica:

rs0:PRIMARY> rs.add("node2.example.com")
rs0:PRIMARY> rs.add("node3.example.com")

Answer 2

There are number of steps to solve this problem with docker:

1. switch to db admin

use admin

2. Create a new site admin user

 db.createUser( { user: "siteUserAdmin", pwd: "password", roles: [ { role: "userAdminAnyDatabase", db: "admin" } ] }); 

3. Create a new root user

db.createUser( { user: "siteRootAdmin", pwd: "password", roles: [ { role: "root", db: "admin" } ] });

4. We can now initiate the replica set:

  rs.initiate() { "info2" : "no configuration explicitly specified -- making one", "me" : "node1.example.com:27017", "info" : "Config now saved locally. Should come online in about a minute.", "ok" : 1 } 

5. Verify the initial replica & check the configuration :

 rs0:PRIMARY> rs.conf() { "_id" : "rs0", "version" : 1,r "members" : [ { "_id" : 0, "host" : "node1.example.com:27017" } ] } 

Answer 3

I built an image which provide env variables for replication and sharded cluster: khezen/mongo

replica set is initialized automatically.