TOSCA Workflows Use Cases

Concurrency resolving tomcat Tomcat Requirements Host Scenario 1: Create operation download zip files and unzip them, both in parallel in order to optimize bandwidth. HostedOn mysql MySQL Requirements Host compute started mysql creating tomcat creating mysql create tomcat create HostedOn compute tosca.nodes.Compute Capabilities Container mysql created tomcat created

Concurrency resolving tomcat Tomcat Requirements Host compute started Scenario 2: Create operation performed through apt-get command that doesn’t support concurrency. mysql creating HostedOn mysql MySQL Requirements Host mysql create mysql created tomcat creating HostedOn tomcat create compute tosca.nodes.Compute Capabilities Container tomcat created

Hosted_On – Active hosting compute started tomcat creating Note: pre_configure_target and post_configure_target operations are not allowed as the compte node is not provided by the user but Substituated by the orchestrator. The user has no ownership on it’s lifecycle. tomcat create tomcat Tomcat Capabilities Container Requirements Host tomcat created tomcat configuring HostedOn pre_configure_source tomcat configure HostedOn post_configure_source HostedOn compute tosca.nodes.Compute Capabilities Container tomcat configured tomcat starting tomcat start tomcat started Many other scenaris like Database on DBMS, even some War on containers

Hosted_On – Passive hosting Source ElasticSearch Plugin Requirements Host I need to create the plugin before the ElasticSearch is created HostedOn Target ElasticSearch Capabilities Container ElasticSearch Java plugins: Documentation extract: These plugins contain only JAR files, and must be installed on every node in the cluster. After installation, each node must be restarted before the plugin becomes visible.

Cluster Manager/Managed use case Need some nodes to be in certain states before next nodes do something. Cluster with master Election and then need the address of the master Runtime impacts with new master election are also to consider. TODO detail the use-case