How to Install MongoDB 4 on CentOS 7

(: October 3, 2018)

In this guide, we will cover the steps to install the latest release of MongoDB community edition on your CentOS 7 server. MongoDB is an open source NoSQL database system written in C++ designed to ensure scalability, high performance, and availability.

MongoDB common use case is storage and management of Big Data-sized collections of literal documents like text documents, email messages, XML documents, and many others.

How to Install MongoDB 4 on CentOS 7

MongoDB 4 is installed on CentOS 7 using the upstream repository. Add the repository to your CentOS 7 server by running below commands:{text-align:left} img{margin:0 auto 0 0}
# cat >/etc/yum.repos.d/mongodb-org-4.0.repo<<EOF
name=MongoDB Repository

Once the repo has been added, install mongodb-org package

sudo yum install mongodb-org

The installation of the above package will install the following dependency packages:

mongodb-org-server – This provides MongoDB daemon mongod
mongodb-org-mongos – This is a MongoDB Shard daemon
mongodb-org-shell – This provides a shell to MongoDB
mongodb-org-tools – MongoDB tools used for export, dump, import e.t.c

Configure MongoDB on CentOS 7

When the packages are installed, you can start customizing and configuring MongoDB before starting the service.

Label MongoDB port

If you have SELinux in enforcing mode, you may need to label port 27017

sudo semanage port -a -t mongod_port_t -p tcp 27017

Open port on the firewall

If you have firewalld running on your server and would like MongoDB service to be accessible over the network, open it on the firewall:

sudo firewall-cmd --add-port=27017/tcp --permanent
sudo firewall-cmd --reload

You can also limit access based on source address

sudo firewall-cmd --permanent --add-rich-rule "rule family="ipv4" 
source address="" port protocol="tcp" port="27017" accept"

Use secondary disk for MongoDB data

You can always use a dedicated disk / virtual disk to store MongoDB data. This can be configured like below

Step 1: Partition secondary disk for MongoDB data:

# lsblk  | grep vdb
vdb             252:16   0  50G  0 disk

Step 2: Create a GPT partition table for the secondary disk, it can be more than onde disk

parted -s -a optimal -- /dev/vdb mklabel gpt
parted -s -a optimal -- /dev/vdb mkpart primary 0% 100%
parted -s -- /dev/vdb align-check optimal 1

Step 3: Create LVM volume, this will make it easy to extend the partition

# pvcreate  /dev/vdb1
  Physical volume "/dev/vdb1" successfully created.

# vgcreate vg11 /dev/vdb1
  Volume group "vg11" successfully created

# lvcreate -n data -l 100%FREE vg11
Logical volume "data" created

Step 4: Create XFS filesystem on the Logical Volume created

# mkfs.xfs /dev/mapper/vg11-data
meta-data=/dev/mapper/vg11-data isize=512    agcount=4, agsize=6553344 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=26213376, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=12799, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

Step 5: Create a mount point and mount the partition

echo "/dev/mapper/vg11-data /data xfs defaults 0 0" >> /etc/fstab
mkdir /data
mount -a

Step 6: Create a folder for MongoDB data

mkdir /data/mongo
chown -R mongod:mongod /data/mongo
chmod -R 775 /data/mongo

Step 7: Confirm that the partition mount was successful:

# df -hT | grep  /var/lib/mongo
/dev/mapper/vg11-mongodb xfs        50G   33M   50G   1% /var/lib/mongo

Step 8: Change MongoDB data store location

$ sudo vim /etc/mongod.conf
dbPath: /data/mongo 
  enabled: true

Start MongoDB Service

When all is set, start and set mongod service to start on boot.

sudo systemctl enable mongod
sudo systemctl status mongod

For Authentication, check our guide on How to configure MongoDB 4 authentication.{text-align:left} img{margin:0 auto 0 0}