diff --git a/.gitignore b/.gitignore
index 27ace47..886279f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@ venv
 logs
 results
 *.pyc
-__pycache__
\ No newline at end of file
+__pycache__
+.vscode
\ No newline at end of file
diff --git a/albs-oval-errata-diff.py b/albs-oval-errata-diff.py
deleted file mode 100644
index 8c59f90..0000000
--- a/albs-oval-errata-diff.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from albs_oval_erratta_diff.start import start
-
-
-start()
diff --git a/albs_oval_errata_diff.py b/albs_oval_errata_diff.py
new file mode 100644
index 0000000..d878108
--- /dev/null
+++ b/albs_oval_errata_diff.py
@@ -0,0 +1,7 @@
+"""
+albs_oval_errata_diff.py is a service startup script
+"""
+from albs_oval_errata_diff.start import start
+
+
+start()
diff --git a/albs_oval_erratta_diff/__init__.py b/albs_oval_errata_diff/__init__.py
similarity index 100%
rename from albs_oval_erratta_diff/__init__.py
rename to albs_oval_errata_diff/__init__.py
diff --git a/albs_oval_erratta_diff/comparer.py b/albs_oval_errata_diff/comparer.py
similarity index 100%
rename from albs_oval_erratta_diff/comparer.py
rename to albs_oval_errata_diff/comparer.py
diff --git a/albs_oval_errata_diff/config.py b/albs_oval_errata_diff/config.py
new file mode 100644
index 0000000..ab69d67
--- /dev/null
+++ b/albs_oval_errata_diff/config.py
@@ -0,0 +1,105 @@
+'''
+config.py used for generation service configuration based on input json file
+'''
+
+from datetime import datetime, date
+from pathlib import Path
+from typing import Dict, List
+from ipaddress import IPv4Address
+
+from pydantic import BaseModel, validator, Field  # pylint: disable=import-error
+import yaml
+
+
+# DEFAULTS
+DIFF_FILE = Path('/tmp/albs-oval-errata-diff.json')
+DOWNLOAD_DIR = Path('/tmp')
+LOG_FILE = Path('logs/albs-oval-errata-diff.log')
+PACKAGES_EXCLUDE = []
+SA_EXCLUDE = []
+SERVER_PORT = 3001
+SERVER_IP = IPv4Address('127.0.0.1')
+# not checking anything before RHEL-9.0 release
+NOT_BEFORE = datetime(2022, 5, 18)
+UPDATE_INTERVAL_MINUTES = 30
+
+
+class ReleaseUrls(BaseModel):
+    """
+    ReleaseUrls represents list of RHEL/Alma Oval and Errata URLS for specific OS release
+    """
+    rhel_oval_url: str = Field(description='URL for RHEL OVAL file')
+    alma_oval_url: str = Field(description='URL for Alma OVAL file')
+    alma_errata_url: str = Field(description='URL for Alma Errata file')
+
+
+class Config(BaseModel):
+    """
+    Config represents service configuration
+    """
+    diff_file: Path = Field(description="file to store diff JSON in",
+                            default=DIFF_FILE)
+    download_dir: Path = Field(
+        description='directory to download Oval/Errata files to',
+        default=DOWNLOAD_DIR)
+    log_file: Path = Field(
+        description='file to write logs to',
+        default=LOG_FILE)
+    packages_exclude: List[str] = Field(
+        description='list of RPM package names to exclude from checking',
+        default=PACKAGES_EXCLUDE)
+    releases: Dict[int, ReleaseUrls] = Field(
+        description='list of OS releases with Oval/Errata URLs to check')
+    sa_exclude: List[str] = Field(
+        description='list of Security Advisory IDs (ALSA-2022:5219) to exclude from checking',
+        default=SA_EXCLUDE)
+    server_port: int = Field(
+        description="port that will be used by websever",
+        default=SERVER_PORT)
+    server_ip: IPv4Address = Field(
+        description="IP that will be used by webserver",
+        default=SERVER_IP)
+    not_before: date = Field(
+        description='date to start checking from (YYYY-mm-dd)',
+        default=NOT_BEFORE)
+    update_interval_minutes: int = Field(
+        description='how often service will be running difference checks (in minutes)',
+        default=UPDATE_INTERVAL_MINUTES)
+
+    @validator("releases", pre=True)
+    @classmethod
+    def parse_releases(cls, value) -> Dict[int, ReleaseUrls]:
+        """
+        parse_release converts releases attribute
+        Dict[int, Dict[str, str]] -> Dict[str, ReleaseUrls]
+        """
+        result: Dict[int, ReleaseUrls] = {}
+        for release, urls in value.items():
+            result[release] = ReleaseUrls(rhel_oval_url=urls['rhel_oval_url'],
+                                          alma_oval_url=urls['alma_oval_url'],
+                                          alma_errata_url=urls['alma_errata_url'])
+        return result
+
+    @validator("not_before", pre=True)
+    @classmethod
+    def str_to_datetime(cls, value) -> datetime:
+        """
+        str_to_datetime converts string attr str -> datetime
+        """
+        return datetime.strptime(
+            value,
+            "%Y-%m-%d"
+        ).date()
+
+
+def get_config(yml_path: str) -> Config:
+    """
+    get_config loads yml file and generates Config instance
+    """
+    with open(yml_path, 'r', encoding='utf-8') as flr:
+        data = yaml.safe_load(flr)
+    return Config(**data)
+
+
+if __name__ == "__main__":
+    print(get_config('./config.default.yml'))
diff --git a/albs_oval_erratta_diff/package.py b/albs_oval_errata_diff/package.py
similarity index 100%
rename from albs_oval_erratta_diff/package.py
rename to albs_oval_errata_diff/package.py
diff --git a/albs_oval_erratta_diff/sa.py b/albs_oval_errata_diff/sa.py
similarity index 100%
rename from albs_oval_erratta_diff/sa.py
rename to albs_oval_errata_diff/sa.py
diff --git a/albs_oval_erratta_diff/start.py b/albs_oval_errata_diff/start.py
similarity index 100%
rename from albs_oval_erratta_diff/start.py
rename to albs_oval_errata_diff/start.py
diff --git a/albs_oval_erratta_diff/config.py b/albs_oval_erratta_diff/config.py
deleted file mode 100644
index 73bedcd..0000000
--- a/albs_oval_erratta_diff/config.py
+++ /dev/null
@@ -1,21 +0,0 @@
-from pathlib import Path
-import datetime
-
-RELEASES = {
-    8: {'rhel_oval_url': 'https://www.redhat.com/security/data/oval/v2/RHEL8/rhel-8.oval.xml.bz2',
-        'alma_oval_url': 'https://repo.almalinux.org/security/oval/org.almalinux.alsa-8.xml.bz2',
-        'alma_errata_url': "https://errata.almalinux.org/8/errata.full.json", },
-    9: {'rhel_oval_url': 'https://www.redhat.com/security/data/oval/v2/RHEL9/rhel-9.oval.xml.bz2',
-        'alma_oval_url': 'https://repo.almalinux.org/security/oval/org.almalinux.alsa-9.xml.bz2',
-        'alma_errata_url': "https://errata.almalinux.org/9/errata.full.json", }
-}
-LOG_FILE = Path('logs/albs-oval-errata-diff.log')
-DIFF_FILE = Path('results/diff.json')
-DOWNLOAD_DIR = Path('/tmp')
-# not checking anything before RHEL-9.0 release
-NOT_BEFORE = datetime.datetime(2022, 5, 18)
-UPDATE_INTERVAL_MINUTES = 30
-SERVER_PORT = 3001
-SERVER_IP = "127.0.0.1"
-SA_EXCLUDE = []
-PACKAGES_EXCLUDE = ["dotnet-sdk-3.1-source-built-artifacts"]
diff --git a/config.default.yml b/config.default.yml
new file mode 100644
index 0000000..93c757a
--- /dev/null
+++ b/config.default.yml
@@ -0,0 +1,68 @@
+---
+# diff_file
+# file to store diff JSON in
+# requred: no
+# default: /tmp/albs-oval-errata-diff.json
+diff_file: /tmp/albs-oval-errata-diff.json
+
+# download_dir
+# directory to download Oval/Errata files to
+# required: no
+# default: /tmp
+download_dir: /tmp
+
+# log_file
+# file to write logs to
+# requred: no
+# default: logs/albs-oval-errata-diff.log
+log_file: logs/albs-oval-errata-diff.log
+
+# packages_exclude
+# list of RPM package names to exclude from checking
+# requred: no
+# default: []
+packages_exclude: []
+
+# releases
+# list of OS releases with Oval/Errata URLs to check
+# required: yes
+# default: N/A
+releases:
+  8:
+    rhel_oval_url: https://www.redhat.com/security/data/oval/v2/RHEL8/rhel-8.oval.xml.bz2
+    alma_oval_url: https://repo.almalinux.org/security/oval/org.almalinux.alsa-8.xml.bz2
+    alma_errata_url: https://errata.almalinux.org/8/errata.full.json
+  9:
+    rhel_oval_url: https://www.redhat.com/security/data/oval/v2/RHEL9/rhel-9.oval.xml.bz2'
+    alma_oval_url: https://repo.almalinux.org/security/oval/org.almalinux.alsa-9.xml.bz2'
+    alma_errata_url: https://errata.almalinux.org/9/errata.full.json
+
+# sa_exclude
+# list of Security Advisory IDs (ALSA-2022:5219) to exclude from checking
+# requred: no
+# default: []
+sa_exclude: []
+
+# server_port
+# port that will be used by websever
+# required: no
+# default: 3001
+server_port: 3001
+
+# server_ip
+# IP that will be used by webserver
+# required: no
+# default: 127.0.0.1
+server_ip: 127.0.0.1
+
+# not_before
+# date to start checking from (YYYY-mm-dd)
+# required: no
+# default: 2022-5-18 (Release of RHEL 9.0)
+not_before: 2022-5-18
+
+# update_interval_minutes
+# how often service will be running difference checks (in minutes)
+# required: no
+# default: 30
+update_interval_minutes: 30
\ No newline at end of file