diff --git a/ansible.cfg b/ansible.cfg
index 4ae0c8c..ea0bfe0 100644
--- a/ansible.cfg
+++ b/ansible.cfg
@@ -2,3 +2,4 @@
 inventory = inventory.yml
 roles_path = ./roles
 force_color = true
+interpreter_python = /usr/bin/python3
diff --git a/inventory.yml b/inventory.yml
index 215250f..590be8f 100644
--- a/inventory.yml
+++ b/inventory.yml
@@ -1,6 +1,4 @@
 all:
-  children:
-    postgres_servers:
-      hosts:
-        192.168.0.71:
-          ansible_user: ansible
\ No newline at end of file
+  hosts:
+    192.168.0.71:
+      ansible_user: ansible
\ No newline at end of file
diff --git a/roles/postgresql/tasks/configure.yml b/roles/postgresql/tasks/configure.yml
index c015e8d..9cd61ac 100644
--- a/roles/postgresql/tasks/configure.yml
+++ b/roles/postgresql/tasks/configure.yml
@@ -1,4 +1,4 @@
-- name: Configure postgresql.conf with template
+- name: Configure postgresql.conf
   template:
     src: postgresql.conf.j2
     dest: /var/lib/pgsql/data/postgresql.conf
@@ -7,7 +7,7 @@
     mode: '0644'
   notify: Restart PostgreSQL
 
-- name: Configure pg_hba.conf with template
+- name: Configure pg_hba.conf
   template:
     src: pg_hba.conf.j2
     dest: /var/lib/pgsql/data/pg_hba.conf
diff --git a/roles/postgresql/tasks/databases.yml b/roles/postgresql/tasks/databases.yml
index 66dabdd..ac5cf48 100644
--- a/roles/postgresql/tasks/databases.yml
+++ b/roles/postgresql/tasks/databases.yml
@@ -5,7 +5,7 @@
     encoding: UTF8
     state: present
 
-- name: Create contacts table in PostgreSQL
+- name: Create contacts table
   community.postgresql.postgresql_query:
     db: '{{ postgres_db }}'
     query: |
diff --git a/roles/postgresql/tasks/insert_data.yml b/roles/postgresql/tasks/insert_data.yml
index 151f687..4f7dcd5 100644
--- a/roles/postgresql/tasks/insert_data.yml
+++ b/roles/postgresql/tasks/insert_data.yml
@@ -1,4 +1,4 @@
-- name: Insert data into PostgreSQL database idempotently
+- name: Insert data into PostgreSQL database
   community.postgresql.postgresql_query:
     db: '{{ postgres_db }}'
     query: |
diff --git a/roles/postgresql/tasks/open_firewall.yml b/roles/postgresql/tasks/open_firewall.yml
index 99ff9ed..2c084af 100644
--- a/roles/postgresql/tasks/open_firewall.yml
+++ b/roles/postgresql/tasks/open_firewall.yml
@@ -4,7 +4,9 @@
     permanent: true
     state: enabled
   become: true
-  
-- name: Reload firewall using command
-  command: firewall-cmd --reload
+
+- name: Reload firewalld
+  systemd:
+    name: firewalld
+    state: reloaded
   become: true
diff --git a/roles/postgresql/templates/postgresql.conf.j2 b/roles/postgresql/templates/postgresql.conf.j2
index 7013fde..7bff891 100644
--- a/roles/postgresql/templates/postgresql.conf.j2
+++ b/roles/postgresql/templates/postgresql.conf.j2
@@ -1,12 +1,11 @@
-listen_addresses = '{{ postgres_listen_addresses | default("*") }}'
+listen_addresses = '{{ postgres_listen_addresses }}'
 
-port = {{ postgres_port | default(5432) }}
+port = {{ postgres_port }}
 
-
-max_connections = {{ postgres_max_connections | default(100) }}
-shared_buffers = {{ postgres_shared_buffers | default("128MB") }}
-effective_cache_size = {{ postgres_effective_cache_size | default("4GB") }}
-maintenance_work_mem = {{ postgres_maintenance_work_mem | default("64MB") }}
-checkpoint_completion_target = {{ postgres_checkpoint_completion_target | default(0.7) }}
-wal_buffers = {{ postgres_wal_buffers | default("16MB") }}
-default_statistics_target = {{ postgres_default_statistics_target | default(100) }}
\ No newline at end of file
+max_connections = {{ postgres_max_connections }}
+shared_buffers = {{ postgres_shared_buffers }}
+effective_cache_size = {{ postgres_effective_cache_size }}
+maintenance_work_mem = {{ postgres_maintenance_work_mem }}
+checkpoint_completion_target = {{ postgres_checkpoint_completion_target }}
+wal_buffers = {{ postgres_wal_buffers }}
+default_statistics_target = {{ postgres_default_statistics_target }}
diff --git a/roles/postgresql/vars/main.yml b/roles/postgresql/vars/main.yml
index 2dd04d2..c76a487 100644
--- a/roles/postgresql/vars/main.yml
+++ b/roles/postgresql/vars/main.yml
@@ -8,3 +8,11 @@ postgres_hba_entries:
 backup_dir: "/var/backups/postgresql"
 postgres_user: "postgres"
 postgres_db: "mydb"
+
+postgres_max_connections: 100
+postgres_shared_buffers: '128MB'
+postgres_effective_cache_size: '4GB'
+postgres_maintenance_work_mem: '64MB'
+postgres_checkpoint_completion_target: 0.7
+postgres_wal_buffers: '16MB'
+postgres_default_statistics_target: 100
\ No newline at end of file