diff --git a/utils.py b/utils.py
index 1004b4c421848c481de9daa2f4a6f795dfc8a359..3f26783e356da1e58018af9739c0cd3c1c79034d 100644
--- a/utils.py
+++ b/utils.py
@@ -5,6 +5,7 @@
 from collections import OrderedDict
 from pathlib import Path
 import re
+import socket
 import subprocess
 import sys
 from typing import Any
@@ -277,9 +278,9 @@ def run_commands(cmds: list):
                 if not cmd.get("target"):
                     raise Exception("No target file to write in.")
                 if (
-                    cmd.get("backup") and
-                    Path(cmd["target"]).exists() and
-                    not Path(cmd["target"] + ".back").exists()
+                    cmd.get("backup")
+                    and Path(cmd["target"]).exists()
+                    and not Path(cmd["target"] + ".back").exists()
                 ):
                     Path(cmd["target"]).rename(Path(cmd["target"] + ".back"))
                     log("A backup file has been created for:\n%s" % cmd["target"])
@@ -325,30 +326,30 @@ def add_hosts_to_localhost(hosts: list):
     :raises Exception: Houston we have a problem
     """
 
-    rc, hostname = exec_cmd('hostname')
+    rc, hostname = exec_cmd("hostname")
     if rc == 0 and hostname not in hosts:
         hosts.insert(0, hostname)
-    with open('/etc/hosts', 'r') as fo:
+    with open("/etc/hosts", "r") as fo:
         content = fo.read()
     new_content = list()
     found_127 = False
-    for line in content.split('\n'):
-        if not found_127 and line.startswith('127.0.0.1'):
+    for line in content.split("\n"):
+        if not found_127 and line.startswith("127.0.0.1"):
             found_127 = True
             for host in hosts:
-                if ' ' + host not in line:
-                    line += ' ' + host
-                    log('Adding host %s to /etc/hosts 127.0.0.1 aliases.' % host)
+                if " " + host not in line:
+                    line += " " + host
+                    log("Adding host %s to /etc/hosts 127.0.0.1 aliases." % host)
         new_content.append(line)
     if not found_127:
-        new_content.append('127.0.0.1 %s' % ' '.join(hosts))
-    new_content = '\n'.join(new_content)
+        new_content.append("127.0.0.1 %s" % " ".join(hosts))
+    new_content = "\n".join(new_content)
     if new_content != content:
-        with open('/etc/hosts', 'w') as fo:
+        with open("/etc/hosts", "w") as fo:
             fo.write(new_content)
-        log('/etc/hosts updated.')
+        log("/etc/hosts updated.")
     else:
-        log('/etc/hosts is already up to date.')
+        log("/etc/hosts is already up to date.")
 
 
 OPENSSL_CONFIG_TEMPLATE = """
@@ -392,7 +393,12 @@ subjectAltName       = @alternate_names
 """
 
 
-def mkcert(domains: list, ecc: bool = True, days: int = 3650, config_tpl: str = OPENSSL_CONFIG_TEMPLATE):
+def mkcert(
+    domains: list,
+    ecc: bool = True,
+    days: int = 3650,
+    config_tpl: str = OPENSSL_CONFIG_TEMPLATE,
+):
     """Generate a self-signed certificate for the domains list.
 
     :param domains: Domains for which the certificates will be self-signed
@@ -416,24 +422,30 @@ def mkcert(domains: list, ecc: bool = True, days: int = 3650, config_tpl: str =
         config_fh.write(config_tpl)
     # key type: elliptic curve (default) or rsa
     if ecc:
-        subprocess.check_call([
-            "openssl", "ecparam",
-            "-name", "secp384r1",
-            "-out", cert_dir + "/ecparam"
-        ])
+        subprocess.check_call(
+            ["openssl", "ecparam", "-name", "secp384r1", "-out", cert_dir + "/ecparam"]
+        )
         keytype = "ec:" + cert_dir + "/ecparam"
     else:
         keytype = "rsa"
     # execute openssl to generate keypair
-    subprocess.check_call([
-        "openssl", "req",
-        "-config", cert_dir + "/conf",
-        "-new",
-        "-x509",
-        "-sha256",
-        "-nodes",
-        "-newkey", keytype,
-        "-keyout", cert_dir + "/key.pem",
-        "-days", str(days),
-        "-out", cert_dir + "/cert.pem"
-    ])
+    subprocess.check_call(
+        [
+            "openssl",
+            "req",
+            "-config",
+            cert_dir + "/conf",
+            "-new",
+            "-x509",
+            "-sha256",
+            "-nodes",
+            "-newkey",
+            keytype,
+            "-keyout",
+            cert_dir + "/key.pem",
+            "-days",
+            str(days),
+            "-out",
+            cert_dir + "/cert.pem",
+        ]
+    )