diff --git a/checks/check_snmp_linux.py b/checks/check_snmp_linux.py
new file mode 100755
index 0000000..bebb5fe
--- /dev/null
+++ b/checks/check_snmp_linux.py
@@ -0,0 +1,253 @@
+#!/usr/bin/env python3
+"""SNMP defaults linux python check"""
+"""dependencys:
+- pip3 install nagiosplugin
+- pip3 install argparse
+- pip3 install easysnmp
+    - https://easysnmp.readthedocs.io/en/latest/index.html
+    - https://easysnmp.readthedocs.io/en/latest/session_api.html
+"""
+
+__version__     = '0.1.0'
+__author__      = 'anima'
+
+# imports
+import logging
+import argparse
+import nagiosplugin
+from easysnmp import Session
+
+# log settings
+logging.basicConfig(format='[%(asctime)s] %(levelname)s %(message)s', level=logging.INFO)
+
+def init_snmp_session(hostname: str = 'localhost', snmp_version: str | int = '2', snmp_community: str = 'public',
+    snmp_security_level: str = 'auth_with_privacy', snmp_security_username: str = 'monitoring',
+    snmp_auth_protocol: str = 'SHA256', snmp_auth_password: str | None = None,
+    snmp_privacy_protocol: str = 'AES', snmp_privacy_password: str | None = None
+    ) -> Session:
+    """init a easysnmp session
+
+    Args:
+        hostname (str, optional): hostname or ip of host. Defaults to 'localhost'.
+        snmp_version (str, optional): version of snmp (1, 2, 3). Defaults to 2.
+        snmp_community (str, only need for v1 & v2): snmp community if snmp v1 or v2 used (any). Defaults to 'public'.
+        snmp_security_level (str, only need for v3): security level (no_auth_or_privacy, auth_without_privacy or auth_with_privacy). Defaults to 'auth_with_privacy'.
+        snmp_security_username (str, only need for v3): security name (any). Defaults to 'monitoring'.
+        snmp_auth_protocol (str, only need for v3): authentication protocol (MD5, SHA256, SHA512). Defaults to 'SHA256'.
+        snmp_auth_password (str, only need for v3): authentication passphrase (any). Defaults to None.
+        snmp_privacy_protocol (str, only need for v3): privacy protocol (AES, DES). Defaults to 'AES'.
+        snmp_privacy_password (str, only need for v3): privacy passphrase (any). Defaults to None.
+    
+    Return:
+        easysnmp.Session: session for get or walk actions
+    """
+    # check if snmp version an valid str or int and saves as int
+    valid_versions: list[str, int] = ['1','2','3', 1, 2, 3]
+    if snmp_version not in valid_versions:
+        raise ValueError(f'{snmp_version=} non of {valid_versions=}')
+    else:
+        snmp_version = int(snmp_version)
+
+    if snmp_version == '3':
+        # check if snmp security level valid
+        valid_security_levels: list[str] = ['no_auth_or_privacy', 'auth_without_privacy', 'auth_with_privacy']
+        if snmp_security_level not in valid_security_levels:
+            raise ValueError(f'{snmp_security_level=} is non of {valid_security_levels=}')
+
+        # check if auth protocol valid
+        if snmp_security_level.startswith('auth'):
+            valid_auth_protocols: list[str] = ['MD5', 'SHA', 'SHA256', 'SHA512']
+            if snmp_auth_protocol not in valid_auth_protocols:
+                raise ValueError(f'{snmp_auth_protocol=} is non of {valid_auth_protocols=}')
+
+            if snmp_auth_password is None:
+                raise ValueError(f'{snmp_auth_password=} is not set')
+
+        # check if privacy protocol valid
+        if not snmp_security_level.startswith('no'):
+            valid_privacy_protocols: list[str] = ['AES', 'DES']
+            if snmp_privacy_protocol not in valid_privacy_protocols:
+                raise ValueError(f'{snmp_privacy_protocol=} is non of {valid_privacy_protocols=}')
+
+            if snmp_privacy_password is None:
+                raise ValueError(f'{snmp_privacy_password=} is not set')
+
+
+    if snmp_version == 3: # 2025-01-02: only 'auth_with_privacy' is tested
+        session = Session(hostname=hostname, version=snmp_version, 
+            security_level=snmp_security_level, security_username=snmp_security_username,
+            privacy_protocol=snmp_privacy_protocol, privacy_password=snmp_privacy_password,
+            auth_protocol=snmp_auth_protocol, auth_password=snmp_auth_password)
+    else:
+        session = Session(hostname=hostname, version=snmp_version, community=snmp_community)
+    return session
+
+
+#
+# General Summary
+#
+class SNMPSummary(nagiosplugin.Summary):
+    """default summary for own results"""
+    def verbose(self, results):
+        """creates a multiline response"""
+        result_str = ''
+        for result in results:
+            result_str += f'{str(result)}\n'
+        return result_str
+
+    def ok(self, results):
+        return
+
+    def problem(self, results):
+        return
+
+
+#
+# Disk
+#
+class SNMPDiskResource(nagiosplugin.Resource):
+    def __init__(self, session, exclude_tmpfs:bool = True):
+        """disk check via snmp
+
+        Args:
+            session (easysnmp.Session): Easysnmp Session object
+            exclude_tmpfs (bool, optional): ignore disks from dev type tmpfs. Defaults to True.
+        """
+        self.session = session
+        self.exclude_tmpfs = exclude_tmpfs
+
+    def probe(self) -> list:
+        """check disk size of all disks
+        
+        Returns:
+            list[nagisplugin.Metric]: multiple metric elements (yield)
+        """
+        baseoid = '.1.3.6.1.4.1.2021.9.1'
+        oids = dict()
+        oids['dskIndex']        = '.1'
+        oids['dskPath']         = '.2'
+        oids['dskDevice']       = '.3'
+        oids['dskTotal']        = '.6'
+        oids['dskAvail']        = '.7'
+        oids['dskUsed']         = '.8'
+        oids['dskPercent']      = '.9'
+        oids['dskPercentNode']  = '.10'
+        results = dict()
+        disks = dict()
+        for key,value in oids.items():
+            results[key] = self.session.walk(baseoid + value)
+        for key, value in results.items():
+            for item in value:
+                if key == 'dskIndex':
+                    disks[item.value] = dict()
+                else:
+                    disks[item.oid_index][key] = item.value
+
+        for disk in disks.values():
+            if not (self.exclude_tmpfs and disk['dskDevice'] == 'tmpfs'):
+                yield nagiosplugin.Metric(name=disk['dskPath'], value=int(disk['dskPercent']), uom='%', context='scalar_context')
+                yield nagiosplugin.Metric(name=disk['dskPath'], value=disk, context='disk_info')
+
+
+class SNMPDiskResult(nagiosplugin.Result):
+    def human_size(self, value: int | float, source_unit: str = 'b', target_unit: str = 'gb') -> list[float, str]:
+        """convert a byte int to a higher unit
+
+        stop convert if value < 1024
+        supported units: ['b', 'kb', 'mb', 'gb', 'tb']
+
+        Args:
+            value (int | float): original value
+            source_unit (str, optional): unit of original unit. Defaults to 'b'.
+            target_unit (str, optional): target unit. Defaults to 'gb'.
+
+        Returns:
+            list[float, str]: [new_value, unit]
+        """
+        units = ['b', 'kb', 'mb', 'gb', 'tb']
+        if value < 1024 or source_unit == target_unit:
+            return [value, source_unit]
+        return self.human_size(value / 1024, units[units.index(source_unit) + 1], target_unit=target_unit)
+
+    def __str__(self):
+        free_size, free_unit = self.human_size(int(self.metric.value["dskAvail"]), 'kb')
+        return f'{self.metric.value["dskPath"]} has {round(free_size, 2)} {free_unit} free'
+
+
+def parse_args() -> argparse.Namespace:
+    """evaluates given arguments
+
+    Returns:
+        argsparse.Namespace: Namespace Object with all arguments insert (use: args.long_name_of_argument)
+    """
+    argp = argparse.ArgumentParser(description=__doc__)
+    # Default args
+    argp.add_argument('-v', '--verbose', action='count', default=0,
+        help='increase output verbosity (use up to 3 times)')
+    argp.add_argument('-H', '--hostname', default='localhost',
+        help='IP address or hostname of device to query')
+    argp.add_argument('-t', '--timeout', default=30,
+        help='abort execution after TIMEOUT seconds')
+    argp.add_argument('-m', '--check_mode',
+        choices=[
+            'disk',
+            'cpu',
+            'load?',
+            'memory',
+        ],
+        help='check mode to run')
+
+    # Nagios args / see https://nagios-plugins.org/doc/guidelines.html#THRESHOLDFORMAT
+    argp.add_argument('-w', '--warning', default=':80',
+        help='warning threshold')
+    argp.add_argument('-c', '--critical', default=':90',
+        help='critical threshold')
+
+    # SNMP args (same -* as snmpwalk / snmpget linux command; exept -C/-c & -V /-v because already used (see above))
+    argp.add_argument('-V', '--snmp-version', default='2',
+        help='Used SNMP Version. (1, 2, 3)')
+    argp.add_argument('-C', '--snmp_community', default='public',
+        help='SNMP community if snmp v1 or v2 used (any).')
+    argp.add_argument('-l', '--snmp-security-level', default='auth_with_privacy',
+        help='Security level (no_auth_or_privacy, auth_without_privacy or auth_with_privacy)')
+    argp.add_argument('-u', '--snmp-security-username', default='monitoring',
+        help='Security name (any)')
+    argp.add_argument('-a', '--snmp-auth-protocol', default='SHA256',
+        help='Authentication protocol (MD5, SHA256, SHA512)')
+    argp.add_argument('-A', '--snmp-auth-pass', default=None,
+        help='Authentication passphrase (any)')
+    argp.add_argument('-x', '--snmp-privacy-protocol', default='AES',
+        help='Privacy protocol (AES, DES)')
+    argp.add_argument('-X', '--snmp-privacy-pass', default=None,
+        help='Privacy passphrase (any)')
+
+    args = argp.parse_args()
+    return args
+
+
+def main():
+    args = parse_args()
+    if args.verbose >= 3:
+        logging.getLogger().setLevel(logging.DEBUG)
+
+    session = init_snmp_session(hostname=args.hostname, snmp_version=args.snmp_version, snmp_community=args.snmp_community,
+        snmp_security_level=args.snmp_security_level, snmp_security_username=args.snmp_security_username,
+        snmp_auth_protocol=args.snmp_auth_protocol, snmp_auth_password=args.snmp_auth_pass,
+        snmp_privacy_protocol=args.snmp_privacy_protocol, snmp_privacy_password=args.snmp_privacy_pass)
+
+    # dice which check will be run bases on check_mode
+    match args.check_mode:
+        case 'disk':
+            check = nagiosplugin.Check(
+                SNMPDiskResource(session=session),
+                nagiosplugin.Context(name='disk_info', result_cls=SNMPDiskResult),
+                nagiosplugin.ScalarContext(name='scalar_context', fmt_metric='{name} is {value}{uom} used', warning=args.warning, critical=args.critical),
+                SNMPSummary())
+            check.name = "Disk usage"
+        case _:
+            raise nagiosplugin.CheckError(f'Unknown check mode: {args.check_mode}')
+
+    check.main(args.verbose, args.timeout)
+
+if __name__ == '__main__':
+    main()
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