diff --git a/Linux_reinstall/RedHat/CloudInit/dhcp_interfaces.cfg b/Linux_reinstall/RedHat/CloudInit/dhcp_interfaces.cfg
new file mode 100644
index 0000000..a505c3d
--- /dev/null
+++ b/Linux_reinstall/RedHat/CloudInit/dhcp_interfaces.cfg
@@ -0,0 +1,71 @@
+#cloud-config
+# CLOUD_IMG: This file was created/modified by the Cloud Image build process
+# https://cloudinit.readthedocs.io/en/22.1_a/
+datasource_list: [ NoCloud, None ]
+
+# configure localization
+locale: en_US.UTF-8
+
+# configure timezone
+timezone: TimeZone
+
+# configure root user
+users:
+  - name: root
+    lock_passwd: false
+    shell: /bin/bash
+
+chpasswd:
+  expire: false
+  list: |
+    root:tmpWORD
+  users:
+    - name: root
+      password: tmpWORD
+      type: text
+
+# Despite cloud-init 22.1-9 supports version 2 of network configurations but the "renderers:" doesn't support "network-manager".
+# https://cloudinit.readthedocs.io/en/22.1_a/topics/network-config.html#network-output-policy
+system_info:
+  network:
+    renderers: ['sysconfig']
+
+# The gateway of network for cloud-init 22.1-9 must be "gateway4"(for IPv4) or "gateway6"(for IPv6).
+network:
+  version: 2
+  ethernets:
+    networkAdapter:
+      dhcp4: true
+      dhcp6: true
+
+# later commands
+# Replace ssh port, permit root user login by password, enable sshd service.
+# Add new ssh port for firewalld.
+# Stop and disable kdump service.
+# Set hostname.
+# Install dnf, epel repository.
+# Install some common components.
+# Configure fail2ban.
+# Delete cloud-init config file itself and disable it permanently after first execution.
+runcmd:
+  - sed -ri 's/^#?Port.*/Port sshPORT/g' /etc/ssh/sshd_config
+  - sed -ri 's/^#?PermitRootLogin.*/PermitRootLogin yes/g' /etc/ssh/sshd_config
+  - sed -ri 's/^#?PasswordAuthentication.*/PasswordAuthentication yes/g' /etc/ssh/sshd_config
+  - systemctl enable sshd
+  - ssh-keygen -A
+  - systemctl restart sshd
+  - sed -i '6i \ \ <port port="sshPORT" protocol="tcp"/>' /etc/firewalld/zones/public.xml
+  - sed -i '7i \ \ <port port="sshPORT" protocol="udp"/>' /etc/firewalld/zones/public.xml
+  - systemctl enable firewalld
+  - firewall-cmd --reload
+  - systemctl stop kdump
+  - systemctl disable kdump
+  - hostnamectl set-hostname HostName
+  - yum install dnf epel-release -y
+  - dnf install curl dnsutils fail2ban file lrzsz net-tools vim wget -y
+  - sed -i '/^\[Definition\]/a allowipv6 = auto' /etc/fail2ban/fail2ban.conf
+  - sed -ri 's/^backend = auto/backend = systemd/g' /etc/fail2ban/jail.conf
+  - systemctl enable fail2ban
+  - systemctl restart fail2ban
+  - rm -rf /etc/cloud/cloud.cfg.d/99-fake_cloud.cfg
+  - touch /etc/cloud/cloud-init.disabled