Installing/upgrading and uninstalling mongodb on centos 7

mongodbstuff.txt

// Commands:
mongod --version  // Check version
which mongo       // Check where mongo is

// Locations:
Logs are stored in      /var/log/mongodb
Something is stored in  /var/lib/mongo

Installing
// Go to:
cd /etc/yum.repos.d/
// Edit mongo-org.rep and replace version number to point to different versions.
vim mongodb-org.rep

// Replace X with version number
[mongodb-org-X.X]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/X.X/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-X.X.asc

// Check yum repolist:
yum repolist
yum -y install mongodb-org

// Run mongodb with this:
systemctl start mongod // Probably use sudo because of permissions
netstat -plntu
systemctl status mongod

// Run with config file:
mongod -f /etc/mongod.conf

// Run with config and tail logs:
mongod -f /etc/mongod.conf & tail -qF /var/log/mongodb/mongod.log

// Uninstalling //

// Using yum:
sudo yum erase $(rpm -qa | grep mongodb-org)
// Remove data
sudo rm -r /var/log/mongodb
sudo rm -r /var/lib/mongo

// Using rpm:
rpm -qa | less | grep mongo | xargs yum remove

Links:
https://docs.mongodb.com/manual/reference/method/db.createUser/
https://docs.mongodb.com/manual/reference/built-in-roles/
https://docs.mongodb.com/manual/core/wiredtiger/
https://docs.mongodb.com/manual/reference/configuration-options/