VirtualBox is installed on Mac laptop and the CentOS-7 VM is created in VirtualBox.
In VirtualBox, the CentOS-7-x86_64-Minimal-1511.iso image is used to boot a CentOS-7 VM with 4 GB RAM and the following two network adapters. A host-only adapter is not needed.
eth0 as a NAT adapter
eth1 as an internal network adapter
eth0 is a NAT adapter.
eth1 is an internal network adapter.
Run the following bash script to configure VirtualBox. It will forward the required TCP ports from the host (Mac laptop) to the guest (CentOS-7 VM) and will also create eth1 as an internal network adapter.
# Forward TCP port 3022 on host to TCP port 22 on guest VM so
# that host can SSH into guest VM
if ! VBoxManage showvminfo devstack-odl | grep 3022 > /dev/null
if ! VBoxManage showvminfo devstack-odl | grep eth1 > /dev/null
VBoxManage modifyvm devstack-odl --nic2 intnet
VBoxManage modifyvm devstack-odl --intnet2 "eth1"
# Remove stale entry in ~/.ssh/known_hosts on host
if [ -f ~/.ssh/known_hosts ]; then
sed -i '' '/\[127.0.0.1\]:3022/d' ~/.ssh/known_hosts
Below are the forwarded ports through eth0 (NAT interface) in VirtualBox. Host is the Mac laptop and the guest VM is CentOS-7 booted in VirtualBox.
TCP port 3022 on host is forwarded to TCP port 22 on guest VM so that host can SSH into guest VM.
TCP port 8080 on host is forwarded to TCP port 80 on guest VM so that host can access OpenStack Horizon in browser.
TCP port 6080 on host is forwarded to TCP port 6080 on guest VM so that host can access Nova VNC console in browser.
Below is the screenshot of the forwarded ports through eth0 (NAT interface) in VirtualBox.
Now, boot the CentOS-7 VM in VirtualBox. Choose "VDI" as the disk format for the VM.
When booting the CentOS-7 VM in VirtualBox, press the Tab key and type the following kernel boot options. This keeps the interface names as eth0 and eth1 in the CentOS-7 VM instead of enp0s*.
Once the CentOS-7 VM boots, login into it and check the interfaces ("ip a" or "ifconfig"). eth0 will have an IP address like 10.0.2.15 and eth1 will not have any IP address. Check the default gateway ("ip route"). 10.0.2.2 will be the default gateway. Make sure that you can ping a public DNS name like www.google.com and www.cisco.com.
Below are the output snippets of "ip a" and "ip route" inside the CentOS-7 VM.
$ ip a
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic eth0
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
Create stack user for DevStack. Alternatively, you can use useradd and passwd to create a new stack user, and give sudo access to the stack user by typing visudo, adding "stack ALL=(ALL) ALL" under "root ALL=(ALL) ALL", and saving the file.
Copy the local.conf file below to the devstack directory. It has the OpenStack core services (Horizon, Keystone, Nova, Neutron, Glance, RabbitMQ and MySQL) enabled. It uses OpenvSwitch (OVS) as the virtual switch and VLAN for tenant networks. Remove "OFFLINE=True" below in local.conf if you are deploying DevStack for the very first time as it prevents DevStack from pulling the required OpenStack repos and configuration files.
Add security group rules to the "default" security group in order to SSH into and ping nova VMs. This can be done in Horizon as well.
openstack security group rule create --protocol tcp --dst-port 22 default
openstack security group rule create --protocol icmp --dst-port -1 default
Check the two neutron networks and the neutron router created by DevStack.
On the Mac laptop, enter http://localhost:8080 in a browser to access the Horizon GUI. Login as admin and use nomoresecret as the password. After logging into Horizon, in the upper left, select "demo" as the project.
Boot a nova VM (test-vm) using cirros image, m1.tiny flavor, and attach it to the private network. Also, create a floating IP in the public network and associate it to the nova VM. We can now SSH into the nova VM using the floating IP!
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
inet6 fdc7:3411:13c6:0:f816:3eff:fe28:585/64 scope global dynamic
valid_lft 86375sec preferred_lft 14375sec
inet6 fe80::f816:3eff:fe28:585/64 scope link
valid_lft forever preferred_lft forever
172.24.4.7 above is the floating IP in the public network associated to test-vm and 10.0.0.9 is the private IP address of test-vm.
Below is the network topology of the nova VM test-vm attached to the private network. DevStack creates the public network, private network and the neutron router router1 that connects them.
In Horizon, go to Project --> Compute --> Instances --> test-vm --> Console and right click on the link "Click here to show only console" and click on "Open Link in New Tab".
Now, change the IP address in the new tab's web address from 10.0.2.15 to localhost as VirtualBox redirects TCP port 6080 from the host (Mac laptop) to the guest (CentOS-7 VM). Now, the nova VM's console can be accessed in Horizon!
If a Cirros image is used to boot the nova VM, use the default credentials below to login into the console.
In the CentOS-7 VM, the devstack logs will be /opt/stack/logs. Run ./unstack.sh to unstack Devstack.
The VirtualBox VDI file will be at /Users/<userID>/VirtualBox\ VMs/ on the Mac laptop. This VDI file is portable and can be re-used to boot the CentOS-7 VM in VirtualBox on any machine.
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