Mongo DB Version 5 Access Control With Two Read Replicas - mongodb

Question

I have three ubuntu 20.04 servers:
db-master
db-node1
db-node2
I would like to know how to enable access control.
The servers work fine except when the following configuration is added to /etc/mongod.conf Thanks in advance:
$ mongo --version
MongoDB shell version v5.0.1
$ sudo vim /etc/mongod.conf
security:
keyFile: "/home/ubuntu/security.keyFile"
authorization: enabled
$ sudo systemctl status mongod
● mongod.service - MongoDB Database Server
Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
Active: active (running)
$ sudo systemctl restart mongod
ubuntu#db-node2:~$ sudo systemctl status mongod
● mongod.service - MongoDB Database Server
Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
Active: failed
# mongod.conf
# for documentation of all options, see:
# http://docs.mongodb.org/manual/reference/configuration-options/
# Where and how to store data.
storage:
dbPath: /var/lib/mongodb
journal:
enabled: true
# engine:
# wiredTiger:
# where to write logging data.
systemLog:
destination: file
logAppend: true
path: /var/log/mongodb/mongod.log
# network interfaces
net:
port: 27017
bindIp: 0.0.0.0
# how the process runs
processManagement:
timeZoneInfo: /usr/share/zoneinfo
#security:
#operationProfiling:
replication:
replSetName: "rs0"
#sharding:
## Enterprise-Only Options:
#auditLog:
security:
keyFile: "/home/ubuntu/security.keyFile"
authorization: enabled
#snmp:

Answer 1

Solution
ubuntu#:~$ sudo chown mongodb [PATH TO KEY FILE]
ubuntu#:~$ sudo chgrp root [PATH TO KEY FILE]
ubuntu#:~$ sudo chmod 400 [PATH TO KEY FILE]