Autodesk COMBUSTION-4 Network Guide - Page 13

License Management ❚❘❘ combustion does not support the redundant server model if you choose to use UDP as your primary packet type with UDP packet transmission. To use UDP packets, you must set the environment variable FLEXLM_COMM_TRANSPORT UDP on each client workstation. License Management Rather than purchasing a single-user license for every combustion user or workstation, you can purchase a network license for a maximum number of concurrent users, and purchase additional licenses as needed. combustion uses either TCP (default) or UDP packets to communicate with the AdLM. You can't configure combustion to use both packet types simultaneously. The packet type you use depends on your network environment and the number of clients assigned to a specific server. License Operation and Availability When a user starts combustion, the application reads the combustion.lic file located on the client workstation to determine which server it should try to obtain a license from. combustion then sends a message to the AdLM server listed in the combustion.lic file through the network protocol and requests a license. If the number of available licenses has not exceeded, the AdLM assigns a license to the user. The combustion session then starts on the workstation, and the number of available licenses is reduced by one. If you use environment variables in a distributed or redundant server environment, these variables take precedence over the settings in the combustion.lic file. The client and server communicate at regular intervals to keep track of licenses in use and manage license availability. When a user exits combustion, the AdLM frees a license for another user. Multiple sessions on an individual workstation use only one license. When the last session is closed, the license is freed. The following three processes direct license management: • License manager daemon (lmgrd.exe)- Handles the original contact with the application, then passes the connection to the vendor daemon. Lmgrd is used to communicate with the vendor daemon only and does not authenticate or dispense licenses, it passes user requests on to the vendor daemons. By using this approach, a single lmgrd daemon can be used by many different software vendors to provide license authentication. Lmgrd starts and restarts the vendor daemons as needed. • Autodesk vendor daemon (adskflex.exe)- Contains the server process that releases licenses. The vendor daemon keeps track of the licenses that are checked out and which clients are using them. Each vendor has a unique vendor daemon to manage vendor-specific licensing. adskflex.exe is specific to Autodesk products only. If the vendor daemon terminates for any reason, all users lose their licenses until lmgrd restarts the vendor daemon or the problem causing the termination is resolved. • License file-A text file that has vendor-specific license information. 9