![]() There are detailed instructions for doing so on the Microsoft site. An Azure Bastion host can be created via the Azure portal, Azure CLI, or Azure PowerShell. When configuring this subnet make sure to give it an address space of at least /27 or larger.įor the sake of brevity, I'm not going to walk through the creation of a Bastion host. In addition to the name requirement, the subnet needs a large address space. You should create this subnet in your virtual network before you create the Bastion host to make the installation go smoother. This subnet must be named AzureBastionSubnet. A Bastion host in a virtual network can remotely manage all VMs in the same virtual network.īastion requires a subnet with a specific name where the Bastion host will be deployed. One Azure Bastion host is deployed per virtual network. A public IP address is not required for the VMs, and no additional security rules are configured to the NSG. The connection to the Bastion host from the browser is made using TLS over port 443 ensuring a secure, encrypted connection. A Bastion session is started in the Azure portal and connects to the VM via the browser. The following image, taken from the Microsoft web site, shows the architecture of a Bastion host.Īs shown in the figure, Bastion works like a jump box. It provides secure RDP/SSH connectivity to VMs directly in the Azure portal over TLS, without the need of a public IP address on the destination VM. Azure Bastion combines the flexibility of RDP/SSH with the security of the jump box solution.Īzure Bastion is a PaaS service offering, provisioned inside of a virtual network. There is also the added overhead of managing the jump box VM to consider. The jump box may not be able to meet the demand of many administrators managing several VMs simultaneously. However, in larger environments with multiple VMs and many administrators, scalability becomes an issue. In an Azure environment with relatively few VMs, a jump box is a great solution. This configuration protects the VMs in the second subnet from the public Internet. ![]() The VMs in this private subnet don't have to have a public IP. the private IP address of the jump box VM, or perhaps the jump box subnet itself. The other subnet contains the remaining VMs and has NSG rules to allow port 3389 from private IP addresses only, i.e. ![]() The jump box subnet has NSG rules to allow public connections to port 3389 into the virtual network. One subnet contains the jump box and another subnet contains the remaining VMs. This is accomplished by separating VMs into different subnets. Administrators connect into the jump box using RDP, then create a new RDP connection from the jump box into the other VMs in the virtual network. A jump box is simply a VM instance within the Azure virtual network. A relative newcomer to remote management scene is something known as a "jump box". The security risks inherent with open ports required for RDP and SSH have led administrators to find more secure solutions. Azure provides a message, warning of the risks associated with allowing public access to this port, as shown in the following image. Opening this port to the Internet is a security risk. The rule allows traffic from the Internet into the virtual network via port 3389. Remote management via RDP requires a security rule to be defined in a Network Security Group (NSG). These solutions provided the capability to remotely manage a VM instance (for the remainder of this discussion, I'll describe remote management using RDP, but the rules and requirements are effectively the same for SSH). Remote management in Azure historically has been accomplished using Remote Desktop (RDP) for Windows VMs, and SSH for Linux VMs. ![]() In an Azure environment, you are responsible for managing operating system updates, security patches, software installs, etc., on your VM instances. Nor does it require a separate virtual machine to act as a "jump box". Unlike other methods typically used for VM management, Bastion doesn't require open HTTP ports exposed over the Internet. Azure Bastion is a new PaaS offering that enables remote management of Azure virtual machine instances in a secure and scalable manner.
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