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Version: 3.0

Server

Server is one of the key Flopsar components, which is responsible for managing the entire Flopsar environment. Depending on the mode the server is run, it consists of one or two components.

The server can operate in one of the three modes:

manager This mode makes the server run as a manager only.

database This mode makes the server run as a database instance.

standalone This mode makes the server run as both manager and database (standalone architecture).

Configuration​

Configuration is defined in config.json file under FLOPSAR_WDIR/conf directory.

Local Documentation​

Flopsar executable usage is also documented in man pages. You can access these pages calling:

$ man flopsar

Manager Mode​

Manager is responsible for managing the entire Flopsar environment. When Flopsar runs in this mode, it means the distributed architecture is in use.

Command Line Interface​

The manager is managed by means of CLI subcommands of flopsar executable.

Creating Manager Environment​

In order to create a new Manager environment execute the following command:

$ flopsar create --mode=manager MANAGER_DIR

where MANAGER_DIR is a directory, which the environment is created.

Starting Manager​

In order to start the manager execute the command below:

$ flopsar start MANAGER_DIR

Rerouting Agents​

Every agent needs to know, which database it should connect to. In the distributed architecture, there can be multiple databases running independently. In order to attach an agent to a particular database, you must execute the following command:

$ flopsar agent reroute --pattern=PATTERN --agent-type=java --database=host:port FLOPSAR_DIR

This command will reroute Java agents, which names match the PATTERN to the database listening on host:port.

Removing Agent Data​

If you want to remove some agent from Manager, you just execute the command:

$ flopsar agent rm --pattern=PATTERN --agent-type=java FLOPSAR_WDIR

This command will remove all the data for any Java agent, which name matches the specified PATTERN.

info

You cannot remove any agent data while the server is running.

Database Mode​

Server runs as a database in this mode.

Plugins​

Server provides a plugin mechanism, which allows to replace and extends Flopsar functionalities.

note

Currently, only Manager instances support plugins.

In order to install a new plugin, you need to execute the following command:

$ flopsar plugin add --name=PLG_NAME --lib=PLG_LIB --conf=PLG_CONF FLOPSAR_WDIR

where:

  • PLG_NAME : user-defined plugin name,
  • PLG_LIB : absolute path to the plugin library file,
  • PLG_CONF : optionally, a plugin configuration file name.
caution

Please note, if your plugin has a configuration file, this file must be in your current working directory which you execute the plugin add command from.

You can always print a list of all the installed plugins by executing the following command:

$ flopsar plugin list FLOPSAR_WDIR

In order to uninstall a plugin, you just need to execute the command:

$ flopsar plugin rm --name=PLG_NAME FLOPSAR_WDIR

where PLG_NAME is the name of the plugin you want to uninstall.

Example​

Suppose, we have the following resources: a plugin file myplugin.so and its configuration file myplugin.conf in a current working directory, which is, for example /opt/flopsar. Flopsar manager installation is in /opt/flopsar/flopsar-server directory:

$ pwd
/opt/flopsar
$ ls
flopsar-server myplugin.so myplugin.conf

In order to add the plugin, we need to execute the following command:

$ flopsar plugin add --name=myFancyPlugin --lib=/opt/flopsar/myplugin.so \
    --conf=myplugin.conf flopsar-server

If the plugin was successfully installed, we should see the following message:

Plugin "myFancyPlugin" added successfully.

If you do not see the above message, an error must have occurred. In order to get more details, add an extra option --verbose to the command, and execute it again. Now, a new log file out.log should be created with more information about the issue.