Eucalyptus is commercial and open-source computer software for creating private and hybrid CLOUD computing environments that are compatible with Amazon Web Services (AWS). It was created by the company Eucalyptus Systems. Eucalyptus stands for Elastic Utility Computing Architecture for Linking Your Programs To Useful Systems. Eucalyptus enables application workloads to be flexibly scaled up or down by pooling compute, storage, and network resources.

Some of its functionalities are:

• Users can configure computing, network, and storage resources using the Eucalyptus USER Console. Using built-in key management and encryption capabilities, development and test TEAMS may control virtual instances.
• Eucalyptus can run a variety of virtual machine images, including Windows and Linux. Users can create a library of Eucalyptus Machine Images (EMIs) that are detached from infrastructure details, allowing them to run on Eucalyptus clouds.
• Eucalyptus supports storage area network devices that use storage arrays to boost performance and reliability. Direct-attached storage is also supported by Eucalyptus.
• New features for AWS compatibility have been added to Eucalyptus 3.3. Resource tagging, for example, allows application developers and cloud managers to add configurable metadata tags to resources like firewalls, load balancers, Web servers, and particular workloads to help them be more easily identified.
• Maintenance Mode in Eucalyptus 3.3 allows cloud managers to do maintenance on Eucalyptus clouds with no interruption to instances or cloud applications.
• Better image management and migrating tools, warm UPGRADE capabilities, a hybrid cloud user console to handle both Eucalyptus and AWS resources, Identity and Access Management (IAM) roles, and ENHANCED High Availability (HA) capabilities are among the new features in Eucalyptus 3.4.