[root@wallet01 ~]# tar zxvf ruby-2.7.2.tar.gz 
[root@wallet01 ~]# cd ruby-2.7.2
[root@wallet01 ruby-2.7.2]# ./configure
[root@wallet01 ruby-2.7.2]# make
[root@wallet01 ruby-2.7.2]# make install

[root@wallet01 ~]# ruby -v
ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]

[root@wallet01 ~]# gem install bundler
Fetching bundler-2.2.1.gem
Successfully installed bundler-2.2.1
Parsing documentation for bundler-2.2.1
Installing ri documentation for bundler-2.2.1
Done installing documentation for bundler after 2 seconds
1 gem installed

[root@wallet01 ~]# git clone https://github.com/fluent/fluentd.git
Cloning into 'fluentd'...
remote: Enumerating objects: 36, done.
remote: Counting objects: 100% (36/36), done.
remote: Compressing objects: 100% (17/17), done.
remote: Total 36828 (delta 15), reused 27 (delta 15), pack-reused 36792
Receiving objects: 100% (36828/36828), 17.57 MiB | 4.37 MiB/s, done.
Resolving deltas: 100% (24423/24423), done.

[root@wallet01 ~]# cd fluentd
[root@wallet01 fluentd]# git checkout v1.11.5

[root@wallet01 fluentd]# bundle install

[root@wallet01 fluentd]# bundle exec rake build
test_file_util.rb for non-root user env. Disable this test on root environment
fluentd 1.11.5 built to pkg/fluentd-1.11.5.gem.

[root@wallet01 fluentd]# gem install pkg/fluentd-1.11.5.gem
Successfully installed fluentd-1.11.5
Parsing documentation for fluentd-1.11.5
Installing ri documentation for fluentd-1.11.5
Done installing documentation for fluentd after 2 seconds
1 gem installed

[root@wallet01 ~]# fluent-gem install fluent-plugin-mongo
Fetching fluent-plugin-mongo-1.5.0.gem
Fetching bson-4.11.1.gem
Fetching fluentd-1.11.5.gem
Fetching mongo-2.6.4.gem
Successfully installed fluentd-1.11.5
Building native extensions. This could take a while...
Successfully installed bson-4.11.1
Successfully installed mongo-2.6.4
Successfully installed fluent-plugin-mongo-1.5.0
Parsing documentation for fluentd-1.11.5
Installing ri documentation for fluentd-1.11.5
Parsing documentation for bson-4.11.1
Installing ri documentation for bson-4.11.1
Parsing documentation for mongo-2.6.4
Installing ri documentation for mongo-2.6.4
Parsing documentation for fluent-plugin-mongo-1.5.0
Installing ri documentation for fluent-plugin-mongo-1.5.0
Done installing documentation for fluentd, bson, mongo, fluent-plugin-mongo after 7 seconds
4 gems installed

[root@wallet01 ~]# fluentd -s
Installed /etc/fluent/fluent.conf.

[root@wallet01 ~]# vim /etc/fluent/fluent.conf
<source>
  @type tail
  path /var/log/httpd/access_log
  pos_file /var/log/td-agent/apache2.access_log.pos
  <parse>
    @type apache2
  </parse>
  tag mongo.apache.access
</source>

<match mongo.**>
  @type mongo
  host 192.168.40.201
  port 27017
  database nagios
  collection access
  capped
  capped_size 1024m
  user nagios
  password nagios@2020

  <inject>
    time_key time
  </inject>

  <buffer>
    flush_interval 10s
  </buffer>
</match>

[root@wallet01 ~]# mongo -u "root" -p "abcd@1234" --authenticationDatabase "admin"
MongoDB shell version v4.0.21
connecting to: mongodb://127.0.0.1:27017/?authSource=admin&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("0ee4fdd7-982a-4318-82da-db8254101dd5") }
MongoDB server version: 4.0.21
> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB
> use nagios
switched to db nagios
> db.createUser({ user: "nagios",pwd: "nagios@2020",  roles: [ { role: "readWrite", db: "nagios" } ] })
Successfully added user: {
        "user" : "nagios",
        "roles" : [
                {
                        "role" : "readWrite",
                        "db" : "nagios"
                }
        ]
}
> db.auth("nagios","nagios@2020")
1

[root@wallet01 ~]# fluentd -d /var/run/fluentd.pid -o /var/log/fluentd.log