MongoDB replica set in docker

gistfile1.txt

# get it
docker pull mongo

# startup a 3 node replica set
docker run --name mongo-rs-1 -d mongo --nojournal --oplogSize 10 --replSet rs
docker run --name mongo-rs-2 -d mongo --nojournal --oplogSize 10 --replSet rs
docker run --name mongo-rs-3 -d mongo --nojournal --oplogSize 10 --replSet rs

# connect to first node
docker run -it --link mongo-rs-1:mongo1 --link mongo-rs-2:mongo2 --link mongo-rs-3:mongo3 --rm mongo /bin/bash

# find all IP's for later commands
MONGO1=`grep mongo1 /etc/hosts | awk '{print $1}'`
MONGO2=`grep mongo2 /etc/hosts | awk '{print $1}'`
MONGO3=`grep mongo3 /etc/hosts | awk '{print $1}'`

mongo mongo1:27017 --eval "rs.initiate(); myconf = rs.conf(); myconf.members[0].host = '$MONGO1:27017'; rs.reconfig(myconf,{force:true}); rs.add('$MONGO2:27017'); rs.add('$MONGO3:27017');"

# test it out!
# write new data on primary
mongo mongo1:27017/test --eval 'db.users.insert({"name":"Somebody", "city": "Raleigh"})'

# check data in secondary
mongo mongo2:27017/test --eval 'rs.slaveOk(); db.users.find().forEach(function(x){printjson(x);})'

# exit docker client container
exit