This provides mongodb related operations and questions.
Usage of mongo_install.sh:
1.cd to the dir of mongo_install.sh
2.run cmd "$ ./mongo_install.sh"
3.if permission denied, run cmd "$ chmod 777 mongo_install.sh"
Usage of mongo_master_slave.sh:
1.cd to the dir of mongo_master_slave.sh
2.run cmd "$ ./mongo_master_slave.sh"
3.if permission denied, run cmd "$ chmod 777 mongo_install.sh"
Attention: mongo_master_slave.sh based on mongo_install.sh