So you've downloaded the latest version of the Opmantek Virtual Appliance from https://opmantek.com/network-tools-download/ and now you want to set it up and take it for a test drive to see how NMIS and the Opmantek networking modules can help you administer your network. No problem. Easy.
All Opmantek Virtual Appliance releases since January 2018 are published as a single "ova" file (Open Virtual Appliance), which encapsulates all necessary data in a single archive.
The import instructions below can be used to deploy the Opmantek Virtual Appliance straight from that one downloaded file.
There are several options for VMware software. Options 2 & 3 require the VMware OVF Tool, find the tool by doing a search on google or by visiting VMware's site, the other requires VMware Fusion (for Mac). Options 2 & 3 assume you have it installed and know where it is.
You can import the OVA file directly into ESXi using ovftool, from the PC or server you run ovftool, run the command like this:
ovftool --name="NMIS" -dm="thin" -ds=datastore_name-number nmis-8.6.7G-VM-CentOS-6.10-64bit.ova vi://user:password@host_ip_address
Remember to set the Virtual Machine name you like, the datastore you want, and point it at the server you want to deploy to.
The Opmantek Virtual Appliance ships with the virtual machine hardware version set very low for maximum compatibility, but you may want to upgrade the hardware version to a higher level (to leverage performance benefits, remove memory limitations, etc.) as described on the VMware website.
VirtualBox will import directly from an OVF/OVA file so you can just start up VirtualBox and select "Import Appliance..."
Browse to where you unzipped the file and select the ovf file
Select the file, you should see a screen something like this:
It should be safe to Import. The import process may take a couple of minutes to complete, just enough time to grab a cup of coffee I'd say.
If you have any trouble the VirtualBox documentation is here: https://www.virtualbox.org/manual/ch01.html#ovf
If your Virtualbox host is Linux and your VMs are stored on XFS or Ext4 file systems, then it is absolutely necessary that you enable the "Host I/O Cache" for all virtual disk controllers after importing the OVF file, or you run the risk of file system corruption in your guest. On one of our test systems (Linux kernel 3.14.23, Virtualbox 4.3.14) the VM wouldn't even fully get through the first boot before the virtual disks got corrupted - but with Host I/O Cache on everything is fine.
Below is an example of how to enable Host I/O Cache using VirtualBox:
It's highly likely that VirtualBox users will find themselves at the dracut emergency shell prompt when first booting our vm that runs CentOS 7.
When faced with this obstacle reboot the vm selecting the rescue kernel.
After it boots login as normal and try the try the following dacut command.
dracut -f /boot/<kernel_image> <kernel_name>
If the command completes successfully reboot the vm normally. Be aware that future kernel updates may require this maneuver be done again.
On Virtualbox, it is needed to configure the interface manually. It is required to create the config file: /etc/sysconfig/network-scripts/ifcfg-enp0s3
The content of this config file is as follows:
TYPE=Ethernet PROXY_METHOD=none BROWSER_ONLY=no BOOTPROTO=dhcp DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6_ADDR_GEN_MODE=stable-privacy NAME=enp0s3 UUID=91c122a2-39d6-4928-860b-59f4d87faea1 DEVICE=enp0s3 ONBOOT=yes NM_CONTROLLED=yes
Once the config file has been created, a VM reboot is needed.
To use OVF/OVA files with other virtualisation systems like KVM you may have to convert the OVF file to a native format; Two well-known tools for this purpose are virt-v2v (available in CentOS6/RHEL) and virt-convert (in Debian).
Even though, there are no caveats in relation to importing the Virtual Appliance using VMware Fusion, it is important to remind users to grant permission to VMware Fusion to fully execute on OSX, specially after installing it.
The following message is displayed while running the VM without the permission granted.
The permission should be granted on System Preferences > Security & Privacy
The Windows Hyper-V technology does not fully support the OVF industry standard. Microsoft documents a complex and somewhat limited procedure on their page about converting OVF files to Hyper-V. There are third-party conversion tools available that simplify this deployment scenario, for example StarWind's free V2V Converterwhich worked well in our tests.
At this point the VM has DHCP enabled, and therefore it will receive a dynamic IP address suitable for your environment. The easiest way to access the VM at that point is from the virtualization software terminal. So go ahead and boot the VM. After the VM is finished booting you will be welcomed by a login prompt. First, log in using the default credentials.
If it's desirable to customize the network settings we offer the following options:
Root's home directory contains 2 example network configurations, one for static IP's and one for DHCP. Copy the one you require to
/etc/sysconfig/network-scripts/ and edit it to suit:
cp ifcfg-ens192.static /etc/sysconfig/network-scripts/<interface_name>
Be sure to verify the following settings:
Next restart the network service for the setting to take affect. In our testing the DHCP address was still present, and the static IP assigned as a secondary (this can be seen with the 'ip address' command). The DHCP address can be removed by using the 'ip address command del' command or be rebooting the system.
TYPE=Ethernet IPADDR=192.168.10.201 NETMASK=255.255.255.0 BROADCAST=192.168.10.255 GATEWAY=192.168.10.51 PROXY_METHOD=none BROWSER_ONLY=no BOOTPROTO=static DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6_ADDR_GEN_MODE=stable-privacy NAME=enp0s3 UUID=9099afe7-6dd6-4aec-bd93-8950b67ab8f5 DEVICE=enp0s3 ONBOOT=yes DNS1=192.168.10.80 DNS2=126.96.36.199
Please note that by default the Opmantek VM Appliance does NOT have a firewall active. If you would like local firewalling on your VM, you can easily enable that:
The standard iptables tools are installed, and all you would have to do, is enter your desired rules in
/etc/sysconfig/iptables, followed by
service iptables restart AND a final one-off run of
chkconfig iptables on. The
service call enables your firewall rules, while the
chkconfig call enables activation of the firewall rules on boot. Until and unless the
chkconfig step is taken, your firewall rules won't persist when the VM is rebooted. Besides this, somewhat low-level, method of configuring an iptables firewall there are also various user-friendly frontends available for installation with
By default the VM boots with DHCP enabled, and once you determine the hostname or IP address of the VM you can access it a web browser using a URL like:
http://nmis.domain.com/ or http://192.168.1.42/
NOTE - If you do not know the IP address of your install run the command ifconfig and use the IP address next to inet addr. Running the command hostname will give you the host name of the VM.
You will be presented with the following screen.
All the module names are clickable and link to the respective applications; but you can also navigate directly to NMIS, Open-AudIT or any of the other Opmantek applications.
Simply open your favourite web browser and navigate to:
http://<vm ip address>/nmis8for NMIS,
http://<vm ip address>/open-auditfor Open-AudIT Community,
http://<vm ip address>/omkfor the list of all Opmantek applications.
The default access credentials are username "nmis", password "nm1888" (more info regarding credentials can be found on this page).
Example NMIS log in page:
Once you've got either the NMIS dashboard or one of the Opmantek application dashboards open, you can also navigate between modules using the "Modules" and "NMIS Modules" menus, respectively.
Once you have Access you will likely want to start configuring NMIS and the nodes you want to manage. Continue below to the NMIS Setup and Configuration quick start guide to learn how.
NMIS8 - A Quick Getting Started Guide
The VM ships with support for secure https access enabled, and you can use https instead of http in any of the URLs mentioned above.
However, the included certificate-key pair is the same for all VM downloads, and it is a self-signed certificate (for "opmantek.local"): this will cause your browser to display security warnings.
If you want to use https access operationally it is highly recommended that you replace this shared default key-certificate pair with your own (or use an automated certification authority like https://letsencrypt.org/ for example).
The first step to using a module is knowing how to open it, the next is to get a license for it. This process is simple and painless: all products on the appliance (except opFlow) now support free licenses (which are not time-limited but limited to 20 nodes). For these applications the initial dialog offers the generation of such a free license; for opFlow the licensing dialog offers guidance for obtaining a trial or a full license. Example screen shot of activating free Open-AudIT trial below:
You can also use the "opLicensing" module (reachable at
http://<vm ip address>/omk/opLicense or from the Modules menu) to manage your licenses comfortably (including the ability to download previously purchased licenses from the Opmantek website). More info about opLicensing can be found here.
All modules on the Virtual Appliance come with their configuration set to very minimal but safe defaults; to explore the full functionality available you will very likely have to make config modifications to suit your environment. These configuration options are all documented on this site, the Opmantek Community Wiki, in the per-application section (or "Application Space"); certain common, shared aspects are discussed in the "opCommon" space.
For all recent Opmantek applications you'll find links to the respective sections of Wiki in the "Help" menu (usually under "Online Documentation"); there's also an online version check on the welcome/landing page, and on each application's "About" page which helps with keeping your modules up to date.
If the command completes succesfully reboot the vm normally. Be aware that future kernel updates may require this manourvrer be done again.