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12.3. Configure the MongoDB Back End and Create the Telemetry Database
The Telemetry service uses MongoDB as its back-end data repository. Before starting the
mongod
service, optionally configure mongod
to run with the --smallfiles
parameter. This parameter configures MongoDB to use a smaller default data file and journal size. MongoDB will limit the size of each data file, creating and writing to a new one when it reaches 512MB.
Procedure 12.1. Configuring the MongoDB Back End and Creating the Telemetry Database
- Optionally configure
mongod
to run with the--smallfiles
parameter. Open the/etc/sysconfig/mongod
file in a text editor, and add the following line:OPTIONS="--smallfiles /etc/mongodb.conf"
MongoDB uses the parameters specified in theOPTIONS
section whenmongod
launches. - Start the MongoDB service:
#
systemctl start mongod.service
- If the database must be accessed from a server other than its local host, open the
/etc/mongod.conf
file in a text editor, and update thebind_ip
with the IP address of your MongoDB server:bind_ip = MONGOHOST
- Open the
/etc/sysconfig/iptables
file in a text editor and add an INPUT rule allowing TCP traffic on port27017
. The new rule must appear before any INPUT rules that REJECT traffic:-A INPUT -p tcp -m multiport --dports 27017 -j ACCEPT
- Restart the
iptables
service to ensure that the change takes effect:#
systemctl restart iptables.service
- Create a database for the Telemetry service:
#
mongo --host MONGOHOST --eval '
db = db.getSiblingDB("ceilometer");
db.addUser({user: "ceilometer",
pwd: "MONGOPASS",
roles: [ "readWrite", "dbAdmin" ]})'
This also creates a database user namedceilometer
. Replace MONGOHOST with the IP address or host name of the server hosting the MongoDB database. Replace MONGOPASS with a password for theceilometer
user.