Capabilities - greese/dasein-cloud-cloudstack GitHub Wiki

The Dasein Cloud CloudStack implementation attempts to support all aspects of CloudStack that are reflected in the Dasein API. Dasein Cloud CloudStack specifically supports:

• VirtualMachines -> VirtualMachine
• Templates -> MachineImage
• Volumes -> Volume
• Snapshots -> Snapshot
• Keypairs -> SSHKeypair
• Networks -> VLAN
• Security Groups -> Firewall
• IpAddresses -> IpAddress
• LoadBalancers -> LoadBalancer

Keep in mind that all conditional scenarios outlined in this document can be ignored. You can focus on the meta-data that Dasein Cloud provides. The information in this document simply exists to illustrate how Dasein Cloud maps CloudStack concepts and capabilities.

For example, the identifyVLANRequirement() method in virtual machine support handles all the logic to tell you whether or not you need to specify a CloudStack network when deploying a virtual machine. It looks like this:

public @Nonnull Requirement identifyVlanRequirement() throws CloudException, InternalException {
    if( provider.getVersion().greaterThan(CSVersion.CS21) ) {
        ProviderContext ctx = provider.getContext();

        if( ctx == null ) {
             throw new CloudException("No context was set for this request");
        }
        String regionId = ctx.getRegionId();

        if( regionId == null ) {
            throw new CloudException("No region was set for this request");
        }
        return (provider.getDataCenterServices().requiresNetwork(regionId) ? Requirement.REQUIRED : Requirement.OPTIONAL);
    }
    return Requirement.OPTIONAL;
}

Basic Networking, Advanced Networking, and Security Groups

Dasein Cloud CloudStack is aware of basic differences between basic networking support and advanced networking, but it also makes some critical assumptions that may not be true in some customer deployments. In particular, support for security groups exists only when a zone is set to securitygroupsenabled = true and networking is basic or there are no advanced networks.

VM Deployment and Networks

If you attempt to deploy a VM into a VLAN, Dasein Cloud will pass that information on to CloudStack.

If you attempt to deploy a VM without specifying a VLAN, the following logic applies:

• If it's a version of CloudStack that does not support networks, it deploys as normal.
• Otherwise, it checks to see if a network is required. If no network is required, it will launch without one.
• If a VLAN is required, it will attempt to identify a free network.

A network is considered required for CloudStack 2.2 and above in zones with advanced networking.

A free network is a crapshoot in CloudStack 2.2. Dasein Cloud simply looks for the first network in the zone.

CloudStack 3.x, however, provides a reliable mechanism for determining a "free network".