mongodb basic kb (backup drop ...)

丢弃db

use something
db.dropDatabase()

backup

# 备份
mongodump -h someip -d somedb

# 还原
cd dump
mongorestore -h someotherip -d somedb ./somedir/

replica-set

# login with the primary node
/usr/local/mongodb/mongo
rs.initiate() # wait unit all op log created, check /bigdata/mongodb/log/mongodb.log
rs.conf()
rs.add("thehostname1")
rs.add(“thehostname2”)

switch primary node

rs.stepDown()