Secure Your OpenStack Environment

Security Groups

The Advantages of Security Groups

Security groups are sets of IP filter rules that are applied to all project instances, which define networking access to the instance. Security groups are an essential feature in cloud computing that provide a powerful way to secure resources in a virtualized environment. With a firewall you can monitor and control network traffic based on a set of predefined security rules.

Hosted, managed and made with love in Germany.

Control the Flow

Flow control in security groups in OpenStack enables administrators to implement granular network policies and rules for their instances. This provides better control over network traffic and prevents unauthorized access to sensitive resources.

Centralized Access Control

Group rules are project specific – project members can edit the default rules for their group and add new rule sets. Security Groups enable you to group multiple access rules in a single object. This makes it easy to grant access to a group of applications and servers

Easy Use Icon

Dynamic Security

Security groups provide dynamic security, which means that security policies can be easily modified and updated as needed. This allows administrators to quickly respond to security threats and adapt to changes in the environment, without the need for manual intervention.

Fly High With Our Cloud

Flexible Icon


Dynamically adapt to changing requirements and environments. We provide the resources, as needed. Ready, whenever you are.
Flexible Icon


We’re built for scale out – and so is our Managed Cloud, based on OpenStack. With us, even sky is not the limit.
Flexible Icon


We’ve seen it all. So we know how to handle tricky situations. Make the most of your Cloud Infrastructure – with us.
Flexible Icon

GDPR Compliant

Data Security and Privacy never get old. And we never get tired of keeping your data safe, here in Germany.
Flexible Icon

Cost Efficient

Get things done with us in a timely manner and pay only for what you use. Saving costs? Sounds savvy.
Flexible Icon

Focus On You

You know your core business best. So do we, when it comes to managing Cloud infrastructures.

Fair. Transparent. Valuable. That’s our Pricing.

What Is Nice To Know

What is a Security Group in OpenStack?

In OpenStack, a security group is a virtual firewall that controls the inbound and outbound network traffic for one or more instances (virtual machines) within a project. A security group acts as a set of rules that define what types of network traffic are allowed to enter or leave an instance.

When you create a new instance, you can specify which security group it should belong to. Each security group is defined by a set of rules that specify the allowed traffic for that group. For example, you can create a rule that allows incoming traffic on port 80 for a web server, or a rule that allows outgoing traffic on port 22 for a SSH server.

Security groups provide an additional layer of security to instances by controlling their network traffic. By default, all incoming traffic is blocked, and you must create rules to allow specific types of traffic. You can also create security groups with different rules for different instances, providing granular control over the network traffic for your instances.

Is there an alternative to a Security Group?

In OpenStack, security groups are the primary means of controlling network traffic to and from instances. However, there are other security mechanisms that can be used in conjunction with or as an alternative to security groups.

One alternative to security groups is the use of Network Address Translation (NAT) and Access Control Lists (ACLs) at the network layer. NAT allows multiple instances to share a single IP address, while ACLs can be used to define rules for allowing or blocking specific types of network traffic at the network layer.

Another alternative is the use of host-based firewalls on individual instances. A host-based firewall is a software firewall that runs on the instance itself, and can be used to control network traffic to and from the instance.

While security groups are the primary means of controlling network traffic in OpenStack, using these additional security mechanisms can provide an additional layer of security and control over network traffic in your OpenStack environment. However, it is important to note that using multiple security mechanisms can also increase complexity and management overhead, so it is important to carefully consider which mechanisms are best suited to your specific use case.

Can multiple applications use a single Security Group?

Yes, multiple instances of different applications can be associated with a single security group in OpenStack. When you create a security group, you can add rules to define what types of network traffic are allowed for that group.

You can then associate multiple instances with the same security group, and they will all inherit the rules defined for that group. This means that if you have multiple instances running different applications that require the same types of network traffic, you can use a single security group to manage the network traffic for all of those instances.

Alternatively, you can create multiple security groups with different rules for different applications, and associate each instance with the appropriate security group. This allows you to provide granular control over the network traffic for each application, while still using the same OpenStack project and underlying network infrastructure.

Who can I contact in Case of a Problem?
You can get help at and in the LiveChat at the bottom right.

Need More Info Around the Cloud?

We know – new things take time to get used to. That’s why where here for you to answer any questions, clear all concerns or receive feedback: get in touch with us by using the LiveChat in the bottom right corner, for example. We are happy to hear from you!