MongoDB is an open-source, document-oriented database designed with both scalability and developer agility in mind. Instead of storing your data in tables and rows as you would with a relational database, in MongoDB, you store JSON-like documents with dynamic schemas.
MongoDB is available for Windows, Linux, OS X, and Solaris, MongoDB is available for free under the GNU Affero General Public License. The language drivers are available under an Apache License.
Here, we will see how to install MongoDB on CentOS 6 / RHEL 6.
Set up MongoDB Repository
We will now set up a MongoDB repository on the system to get the latest version of the MongoDB package.
Create a repository file under the /etc/yum.repos.d directory.
MongoDB 4.2
cat <<EOF > /etc/yum.repos.d/mongodb.repo [mongodb-org-4.2] name=MongoDB Repository baseurl=https://repo.mongodb.org/yum/redhat/6/mongodb-org/4.2/x86_64/ gpgcheck=1 enabled=1 gpgkey=https://www.mongodb.org/static/pgp/server-4.2.asc EOF
MongoDB 4.0
cat <<EOF > /etc/yum.repos.d/mongodb.repo
[mongodb-org-4.0]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/6/mongodb-org/4.0/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.0.asc
EOF
Install MongoDB
Install MongoDB package using the yum command.
yum install -y mongodb-org
Post Installation
XFS Filesystem
You can store databases in EXT4 or XFS filesystem. But, the use of the XFS filesystem is recommended.
Access Control
By default, MongoDB doesn’t offer an authentication mechanism to restrict access to its contents. To overcome this, we need to edit the configuration file and enable access control.
vi /etc/mongod.conf
Add below lines to the mongod.conf file.
security: authorization: enabled
Disable Huge Pages
It is recommended to disable transparent huge pages for the better performance of the MongoDB database.
Ulimit Settings
The default Linux user limit settings for processes, open files, etc are not enough for MongoDB to run. So, set ulimit values as recommended by MongoDB.
Create a limit file inside /etc/security/limits.d directory.
vi /etc/security/limits.d/99-mongodb-nproc.conf
Set the highest ulimit value for mongo user.
mongod soft nofile 64000 mongod hard nofile 64000 mongod soft nproc 64000 mongod hard nproc 64000
Control MongoDB Service
MongoDB can be started/stopped by easy known commands.
To start MongoDB service, run:
service mongod start
To check the status of MongoDB service, run:
service mongod status
Confirm the version of MongoDB.
mongod --version
Output:
db version v4.2.3
git version: 6874650b362138df74be53d366bbefc321ea32d4
OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
allocator: tcmalloc
modules: none
build environment:
distmod: rhel62
distarch: x86_64
target_arch: x86_64
Access MongoDB
Run the below command to access MongoDB shell.
mongo
Output:
db version v4.2.3
git version: 6874650b362138df74be53d366bbefc321ea32d4
OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
allocator: tcmalloc
modules: none
build environment:
distmod: rhel62
distarch: x86_64
target_arch: x86_64
[[email protected] ~]# mongo
MongoDB shell version v4.2.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("a2be871e-186e-4be8-ad51-b03ed5af1f15") }
MongoDB server version: 4.2.3
Welcome to the MongoDB shell.
>
Conclusion
That’s All. I hope you have learned how to install MongoDB on CentOS 6 / RHEL 6.
