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Sheel Rana 17e51ff9d2 Updated deploy_openwrt contents

Aligned deploy_openwrt.rst contents
for better readability and understanding.

Change-Id: I94ee6f13e3925cd6787ed705fd3019e060b665d4

2020-09-30 03:52:40 +00:00

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Deploying OpenWRT as VNF

Once the tacker is installed successfully, follow the steps given below to deploy OpenWRT as VNF:

Ensure Glance already contains OpenWRT image.

If the tacker is installed using devstack, it tries to add the OpenWRT image to Glance during installation.

Make sure that the OpenWRT image has been successfully added to Glance by running following command: openstack image list

$ openstack image list
+--------------------------------------+--------------------------+--------+
| ID                                   | Name                     | Status |
+--------------------------------------+--------------------------+--------+
| 8cc2aaa8-5218-49e7-9a57-ddb97dc68d98 | OpenWRT                  | active |
| 32f875b0-9e24-4971-b82d-84d6ec620136 | cirros-0.4.0-x86_64-disk | active |
| ab0abeb8-f73c-467b-9743-b17083c02093 | cirros-0.5.1-x86_64-disk | active |
+--------------------------------------+--------------------------+--------+

If OpenWRT image does not exist in the output of openstack image list, you can get the customized image of OpenWRT 15.05.1 in your tacker repository, or download the image from.

After downloading the image file, execute following steps:

First Unzip it by using following commands:

$ cd /path/to/tacker/samples/images/
$ gunzip openwrt-x86-kvm_guest-combined-ext4.img.gz

Then upload the image into Glance by using following command:

$ openstack image create OpenWRT --disk-format qcow2 \
      --container-format bare \
      --file /path/to/openwrt-x86-kvm_guest-combined-ext4.img \
      --public

Configure OpenWRT

The example below shows how to create the OpenWRT-based Firewall VNF.

We have a yaml template which contains the configuration of OpenWRT as shown below: tosca-vnfd-openwrt.yaml

../../../samples/tosca-templates/vnfd/tosca-vnfd-openwrt.yaml

We also have another configuration yaml template with some firewall rules of OpenWRT. tosca-config-openwrt-firewall.yaml

../../../samples/tosca-templates/vnfd/tosca-config-openwrt-firewall.yaml

In this template file, we specify the mgmt_driver: openwrt, which means this VNFD is managed by openwrt driver.

This driver can inject firewall rules defined in VNFD to OpenWRT instance by using SSH protocol. We can run cat /etc/config/firewall to confirm if firewall rules are injected successfully.

Create a sample vnfd

$ openstack vnf descriptor create \
    --vnfd-file tosca-vnfd-openwrt.yaml <VNFD_NAME>

Create a VNF

$ openstack vnf create --vnfd-name <VNFD_NAME> \
      --config-file tosca-config-openwrt-firewall.yaml <NAME>

Check the status
```
$ openstack vnf list
$ openstack vnf show <VNF_ID>
```
We can replace the configuration files containing firewall rules with tosca-config-openwrt-vrouter.yaml, tosca-config-openwrt-dnsmasq.yaml , or tosca-config-openwrt-qos.yaml to deploy the router, DHCP, DNS, or QoS VNFs.

The OpenWRT VNFM management driver will follow same way to inject the desired service rules into the OpenWRT instance.

We can run the following commands to check if firewall rules are injected successfully or not:
```
$ cat /etc/config/network # to check vrouter.
$ cat /etc/config/dhcp    # to check DHCP and DNS.
$ cat /etc/config/qos     # to check the QoS rules.
```

Notes

OpenWRT user and password

The user account is 'root' and password is '', which means there is no password for root account.

Procedure to customize the OpenWRT image

The OpenWRT is modified based on KVM OpenWRT 15.05.1 to be suitable for Tacker. Following is the procedure:

$ cd ~
$ wget https://archive.openwrt.org/chaos_calmer/15.05.1/x86/kvm_guest/openwrt-15.05.1-x86-kvm_guest-combined-ext4.img.gz \
        -O openwrt-x86-kvm_guest-combined-ext4.img.gz
$ gunzip openwrt-x86-kvm_guest-combined-ext4.img.gz

$ mkdir -p imgroot

$ sudo kpartx -av openwrt-x86-kvm_guest-combined-ext4.img

# Replace the loopXp2 with the result of above command, e.g., loop0p2
$ sudo mount -o loop /dev/mapper/loopXp2 imgroot
$ sudo chroot imgroot /bin/ash

# Set password of this image to blank, type follow command and then enter two times
$ passwd

# Set DHCP for the network of OpenWRT so that the VNF can be ping
$ uci set network.lan.proto=dhcp; uci commit
$ exit

$ sudo umount imgroot
$ sudo kpartx -dv openwrt-x86-kvm_guest-combined-ext4.img

Footnotes

6.6 KiB Raw Blame History

Deploying OpenWRT as VNF

6.6 KiB

Raw Blame History