diff --git a/cloud-init/centos-cloud/README.md b/cloud-init/centos-cloud/README.md
new file mode 100644
index 0000000..f331dd2
--- /dev/null
+++ b/cloud-init/centos-cloud/README.md
@@ -0,0 +1,9 @@
+# Centos-cloud cloud-init-data image for GNS3 virtual appliance
+
+Generated using the following commands:
+
+```
+printf "#cloud-config\n\npassword: centos\nchpasswd: { expire: False }\nssh_pwauth: True\n" > user-data
+printf "instance-id: centos-cloud\nlocal-hostname: centos-cloud\n" > meta-data
+mkisofs -output centos-cloud-init-data.iso -volid cidata -joliet -rock user-data meta-data
+```
diff --git a/cloud-init/centos-cloud/centos-cloud-init-data.iso b/cloud-init/centos-cloud/centos-cloud-init-data.iso
new file mode 100644
index 0000000..7306891
Binary files /dev/null and b/cloud-init/centos-cloud/centos-cloud-init-data.iso differ
diff --git a/cloud-init/centos-cloud/meta-data b/cloud-init/centos-cloud/meta-data
new file mode 100644
index 0000000..a04521c
--- /dev/null
+++ b/cloud-init/centos-cloud/meta-data
@@ -0,0 +1,2 @@
+instance-id: centos-cloud
+local-hostname: centos-cloud
diff --git a/cloud-init/centos-cloud/user-data b/cloud-init/centos-cloud/user-data
new file mode 100644
index 0000000..28ea93c
--- /dev/null
+++ b/cloud-init/centos-cloud/user-data
@@ -0,0 +1,5 @@
+#cloud-config
+
+password: centos
+chpasswd: { expire: False }
+ssh_pwauth: True
diff --git a/cloud-init/oracle-cloud/README.md b/cloud-init/oracle-cloud/README.md
new file mode 100644
index 0000000..e21fb7d
--- /dev/null
+++ b/cloud-init/oracle-cloud/README.md
@@ -0,0 +1,9 @@
+# Oracle-cloud cloud-init-data image for GNS3 virtual appliance
+
+Generated using the following commands:
+
+```
+printf "#cloud-config\n\npassword: oracle\nchpasswd: { expire: False }\nssh_pwauth: True\n" > user-data
+printf "instance-id: oracle-cloud\nlocal-hostname: oracle-cloud\n" > meta-data
+mkisofs -output oracle-cloud-init-data.iso -volid cidata -joliet -rock user-data meta-data
+```
diff --git a/cloud-init/oracle-cloud/meta-data b/cloud-init/oracle-cloud/meta-data
new file mode 100644
index 0000000..1b71690
--- /dev/null
+++ b/cloud-init/oracle-cloud/meta-data
@@ -0,0 +1,2 @@
+instance-id: oracle-cloud
+local-hostname: oracle-cloud
diff --git a/cloud-init/oracle-cloud/oracle-cloud-init-data.iso b/cloud-init/oracle-cloud/oracle-cloud-init-data.iso
new file mode 100644
index 0000000..b50064d
Binary files /dev/null and b/cloud-init/oracle-cloud/oracle-cloud-init-data.iso differ
diff --git a/cloud-init/oracle-cloud/user-data b/cloud-init/oracle-cloud/user-data
new file mode 100644
index 0000000..26d25a8
--- /dev/null
+++ b/cloud-init/oracle-cloud/user-data
@@ -0,0 +1,5 @@
+#cloud-config
+
+password: oracle
+chpasswd: { expire: False }
+ssh_pwauth: True
diff --git a/packer/centos/centos-cloud-init-data.iso b/packer/centos/centos-cloud-init-data.iso
new file mode 120000
index 0000000..154f415
--- /dev/null
+++ b/packer/centos/centos-cloud-init-data.iso
@@ -0,0 +1 @@
+../../cloud-init/centos-cloud/centos-cloud-init-data.iso
\ No newline at end of file
diff --git a/packer/centos/centos8.json b/packer/centos/centos8.json
new file mode 100644
index 0000000..1d43530
--- /dev/null
+++ b/packer/centos/centos8.json
@@ -0,0 +1,51 @@
+{
+  "builders": [
+    {
+      "disk_compression": true,
+      "disk_image": true,
+      "disk_interface": "virtio-scsi",
+      "disk_size": "{{user `disk_size`}}",
+      "headless": true,
+      "iso_checksum": "sha256:{{user `iso_checksum`}}",
+      "iso_url": "{{user `iso_url`}}",
+      "net_device": "virtio-net-pci",
+      "qemuargs": [
+        [
+          "-cdrom",
+          "centos-cloud-init-data.iso"
+        ]
+      ],
+      "shutdown_command": "sudo shutdown -P now",
+      "ssh_password": "centos",
+      "ssh_timeout": "3600s",
+      "ssh_username": "centos",
+      "type": "qemu",
+      "vm_name": "{{user `vm_name`}}"
+    }
+  ],
+  "provisioners": [
+    {
+      "execute_command": "sudo env {{ .Vars }} {{ .Path }}",
+      "script": "scripts/upgrade-os.sh",
+      "type": "shell"
+    },
+    {
+      "execute_command": "sudo env {{ .Vars }} {{ .Path }}",
+      "script": "scripts/centos-gns3-user.sh",
+      "type": "shell"
+    },
+    {
+      "execute_command": "sudo env {{ .Vars }} {{ .Path }}",
+      "script": "scripts/post_setup.sh",
+      "type": "shell"
+    }
+  ],
+  "variables": {
+    "disk_size": "20G",
+    "iso_checksum": "8717251f8e4d2fe3e5032799caae89358c1ba68d65a16b5128a59ec6003aac1c",
+    "iso_url": "https://cloud.centos.org/centos/8-stream/x86_64/images/CentOS-Stream-GenericCloud-8-20220913.0.x86_64.qcow2",
+    "setup_script": "centos8.sh",
+    "vm_name": "centos8.qcow2"
+  }
+}
+
diff --git a/packer/centos/scripts/centos-gns3-user.sh b/packer/centos/scripts/centos-gns3-user.sh
new file mode 100644
index 0000000..669ffe1
--- /dev/null
+++ b/packer/centos/scripts/centos-gns3-user.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env sh
+
+set -ex
+
+printf "gns3\ngns3\n" | useradd -c "gns3" -G wheel gns3
diff --git a/packer/centos/scripts/post_setup.sh b/packer/centos/scripts/post_setup.sh
new file mode 100644
index 0000000..28fa782
--- /dev/null
+++ b/packer/centos/scripts/post_setup.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+set -ex
+
+# clear repository
+dnf clean all
+
+# clear unused space
+echo 'Clearing unused space...'
+dd if=/dev/zero bs=1M of=/zero >/dev/null 2>&1 || true; rm -f /zero
+sync
diff --git a/packer/centos/scripts/upgrade-os.sh b/packer/centos/scripts/upgrade-os.sh
new file mode 100644
index 0000000..ed5f36d
--- /dev/null
+++ b/packer/centos/scripts/upgrade-os.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+set -ex
+
+# clear repository
+dnf clean all
+
+dnf update -y
diff --git a/packer/oracle/oracle-cloud-init-data.iso b/packer/oracle/oracle-cloud-init-data.iso
new file mode 120000
index 0000000..bf2c166
--- /dev/null
+++ b/packer/oracle/oracle-cloud-init-data.iso
@@ -0,0 +1 @@
+../../cloud-init/oracle-cloud/oracle-cloud-init-data.iso
\ No newline at end of file
diff --git a/packer/oracle/oracle8.json b/packer/oracle/oracle8.json
new file mode 100644
index 0000000..180110d
--- /dev/null
+++ b/packer/oracle/oracle8.json
@@ -0,0 +1,51 @@
+{
+  "builders": [
+    {
+      "disk_compression": true,
+      "disk_image": true,
+      "disk_interface": "virtio-scsi",
+      "disk_size": "{{user `disk_size`}}",
+      "headless": true,
+      "iso_checksum": "sha256:{{user `iso_checksum`}}",
+      "iso_url": "{{user `iso_url`}}",
+      "net_device": "virtio-net-pci",
+      "qemuargs": [
+        [
+          "-cdrom",
+          "oracle-cloud-init-data.iso"
+        ]
+      ],
+      "shutdown_command": "sudo shutdown -P now",
+      "ssh_password": "oracle",
+      "ssh_timeout": "240s",
+      "ssh_username": "cloud-user",
+      "type": "qemu",
+      "vm_name": "{{user `vm_name`}}"
+    }
+  ],
+  "provisioners": [
+    {
+      "execute_command": "sudo env {{ .Vars }} {{ .Path }}",
+      "script": "scripts/upgrade-os.sh",
+      "type": "shell"
+    },
+    {
+      "execute_command": "sudo env {{ .Vars }} {{ .Path }}",
+      "script": "scripts/oracle-gns3-user.sh",
+      "type": "shell"
+    },
+    {
+      "execute_command": "sudo env {{ .Vars }} {{ .Path }}",
+      "script": "scripts/post_setup.sh",
+      "type": "shell"
+    }
+  ],
+  "variables": {
+    "disk_size": "40G",
+    "iso_checksum": "4a98e22908333dae1423e0bb4032c88aed60dbf1267addb73a6905778e9930df",
+    "iso_url": "https://yum.oracle.com/templates/OracleLinux/OL8/u7/x86_64/OL8U7_x86_64-kvm-b148.qcow",
+    "setup_script": "oracle8.sh",
+    "vm_name": "oracle8.qcow2"
+  }
+}
+
diff --git a/packer/oracle/scripts/oracle-gns3-user.sh b/packer/oracle/scripts/oracle-gns3-user.sh
new file mode 100644
index 0000000..669ffe1
--- /dev/null
+++ b/packer/oracle/scripts/oracle-gns3-user.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env sh
+
+set -ex
+
+printf "gns3\ngns3\n" | useradd -c "gns3" -G wheel gns3
diff --git a/packer/oracle/scripts/post_setup.sh b/packer/oracle/scripts/post_setup.sh
new file mode 100644
index 0000000..28fa782
--- /dev/null
+++ b/packer/oracle/scripts/post_setup.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+set -ex
+
+# clear repository
+dnf clean all
+
+# clear unused space
+echo 'Clearing unused space...'
+dd if=/dev/zero bs=1M of=/zero >/dev/null 2>&1 || true; rm -f /zero
+sync
diff --git a/packer/oracle/scripts/upgrade-os.sh b/packer/oracle/scripts/upgrade-os.sh
new file mode 100644
index 0000000..ed5f36d
--- /dev/null
+++ b/packer/oracle/scripts/upgrade-os.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+set -ex
+
+# clear repository
+dnf clean all
+
+dnf update -y