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Copy the configuration files to /etc/freezer/:

sudo cp etc/freezer/freezer-api.conf.sample /etc/freezer/freezer-api.conf
sudo cp etc/freezer/freezer-paste.ini /etc/freezer/freezer-paste.ini

Edit the /etc/freezer/freezer-api.conf file and complete the following actions:

There are two kinds of api interface, v1 and v2.

There are two kinds of database drivers, elasticsearch and Sqlalchemy.

There are four kinds of combinations between api interface and database drivers:

configuration freezer api database driver

configuration1 v1 elasticsearch

configuration2 v2 elasticsearch

configuration3 v1 sqlalchemy

configuration4 v2 sqlalchemy

notes:

Default configuration is freezer api v2 and elasticsearch.

Configuration1: api v1 interface and elasticsearch:
- In the [DEFAULT] section, configure api interface type:
```
[DEFAULT]
...
enable_v1_api = True
```
- In the [storage] section, configure database access:
```
[storage]
...
backend = elasticsearch
driver = elasticsearch
```
- In the [elasticsearch] section, configure elasticsearch access: You might need to create the elasticsearch section first.
```
[elasticsearch]
...
hosts=http://localhost:9200
index=freezer
use_ssl=False
ca_certs=''
use_ssl=False
timeout=60
retries=20
number_of_replicas = 1
```
Configuration2: api v2 interface and elasticsearch:
- In the [DEFAULT] section, configure api interface type:
```
[DEFAULT]
...
#enable_v1_api = True
```
- In the [storage] section, configure database access:
```
[storage]
...
backend = elasticsearch
driver = elasticsearch
```
- In the [elasticsearch] section, configure elasticsearch access: You might need to create the elasticsearch section first.
```
[elasticsearch]
...
hosts=http://localhost:9200
index=freezer
use_ssl=False
ca_certs=''
use_ssl=False
timeout=60
retries=20
number_of_replicas = 1
```
Configuration3: api v1 interface and sqlalchemy:
- In the [DEFAULT] section, configure api interface type:
```
[DEFAULT]
...
enable_v1_api = True
```
- In the [storage] section, configure database access:
```
[storage]
...
backend = sqlalchemy
driver = sqlalchemy
```
- In the [database] section, configure sqlalchemy access:
  
  You might need to create the database section first.
```
[database]
...
connection = mysql+pymysql://root:stack@127.0.0.1/freezer?charset=utf8
```
Configuration4: api v2 interface and sqlalchemy:
- In the [DEFAULT] section, configure api interface type:
```
[DEFAULT]
...
#enable_v1_api = True
```
- In the [storage] section, configure database access:
```
[storage]
...
backend = sqlalchemy
driver = sqlalchemy
```
- In the [database] section, configure sqlalchemy access: You might need to create the database section first.
```
[database]
...
connection = mysql+pymysql://root:stack@127.0.0.1/freezer?charset=utf8
```
- Currently, Freezer API v2 is enabled and used by default. If you want to use Freezer API v1 instead, manually activate it in the [DEFAULT] section:
```
[DEFAULT]
...
enable_v1_api=True
```

configuration	freezer api	database driver
configuration1	v1	elasticsearch
configuration2	v2	elasticsearch
configuration3	v1	sqlalchemy
configuration4	v2	sqlalchemy

Start elasticsearch

The currently supported db is Elasticsearch. In case you are using a dedicated instance of the server, you'll need to start it. Depending on the OS flavor it might be:

# service elasticsearch start

or, on systemd

# systemctl start elasticsearch

Using freezer-manage

Elasticsearch needs to know what type of data each document's field contains. This information is contained in the mapping, or schema definition. Elasticsearch will use dynamic mapping to try to guess the field type from the basic datatypes available in JSON, but some field's properties have to be explicitly declared to tune the indexing engine. To do that, use the freezer-manage command:

# freezer-manage db sync

You should have updated your configuration files before doing this step. freezer-manage has the following options:

To create the db mappings use the following command
```
# freezer-manage db sync
```
To update the db mappings using the following command. Update means that you might have some mappings and you want to update it with a more recent ones
```
# freezer-manage db update
```
To remove the db mappings using the following command
```
# freezer-manage db remove
```
To print the db mappings using the following command
```
# freezer-manage db show
```
To update your settings (number of replicas) all what you need to do is to change its value in the configuration file and then run the following command
```
# freezer-manage db update-settings
```

If you provided an invalid number of replicas that will cause problems later on, so it's highly recommended to make sure that you are using the correct number of replicas. For more info click here Elasticsearch_Replicas_instructions

To get information about optional additional parameters

# freezer-manage -h

If you want to add any additional parameter like --yes or --erase, they should be before the db option. Check the following examples Wrong Example

# freezer-manage db sync -y -e

Correct Example:

# freezer-manage -y -e db sync

create the mappings

# freezer-manage -y -e db sync

run simple instance

$ freezer-api --config-file /etc/freezer/freezer-api.conf

examples running using uwsgi

$ uwsgi --http :9090 --need-app --master --module freezer_api.cmd.wsgi:application

$ uwsgi --https :9090,foobar.crt,foobar.key --need-app --master --module freezer_api.cmd.wsgi:application

example running freezer-api with apache2

sudo vi /etc/apache2/sites-enabled/freezer-api.conf

<VirtualHost ...>
    WSGIDaemonProcess freezer-api processes=2 threads=2 user=freezer display-name=%{GROUP}
    WSGIProcessGroup freezer-api
    WSGIApplicationGroup freezer-api
    WSGIScriptAlias / /opt/stack/freezer_api/cmd/wsgi.py

    <IfVersion >= 2.4>
      ErrorLogFormat "%M"
    </IfVersion>
    ErrorLog /var/log/%APACHE_NAME%/freezer-api.log
    LogLevel warn
    CustomLog /var/log/freezer-api/freezer-api_access.log combined

    <Directory /opt/stack/freezer_api>
      Options Indexes FollowSymLinks MultiViews
      Require all granted
      AllowOverride None
      Order allow,deny
      allow from all
      LimitRequestBody 102400
    </Directory>
</VirtualHost>

Install and configure freezer-scheduler/agent

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