Tango Administrative Tools Tango Administrative Tools Goal Principle

Tango Administrative Tools

Tango Administrative Tools • Goal • Principle (Starter/Astor a couple to danse Tango) • Starter • Astor • Features overview • Start/stop/control device servers on a collection of hosts • Configure and tune polling • Configure and test events • Logs and servers statistics • Configure access control

Tango Administrative Tools • Goal • To know at a quick glance if everything is OK in a control system • And otherwise, to be able to diagnose a problem and solve it. • Configure and the control system and its components. • Long term analysis (logs, statistics, . . . ) • Analysis on data from database (CS info, DS usage, . . . ).

Tango Administrative Tools • Principle - Starter/Astor a couple to danse Tango : • Starter device server running on each controlled host. • A graphical client on all Starter devices.

Astor/Starter Tango Control System Manager Get host list DB server Starter server Host n. Starter DS server DS Host n. Starter server DS DS DS Host n DS DS DS server DS DS Host n DS DS DS Get server list Starter server Host 1 DS DS DS t Ge tu a t s s

Tango Administrative Tools • Starter – Controlled server status : This Tango device server, written in C++, is dedicated to control system management. An instance of the Starter must be running on each host in the control system. • When a Tango device server starts, it registers itself automatically in the TANGO database as running on specified host. • At start-up, the Starter takes this list of servers registered on the host. • Periodically, a system call gets the list of running processes. • For each controlled server, the Starter checks if the server is in the running process list. • If it is running a second check is done by a ping on administrative device to test if the server is alive. • Finally a spectrum containing the server names and their status is built. � The Starter device name must be : tango/admin/<host name> �

Tango Administrative Tools • Starter – Starting controlled servers : • At Starter start up : • For each server, a control level can be defined (level 0 means not controlled). • At start-up, the Starter takes a list of servers registered on host and its control level. • Beginning at level 1 to level n (default is 5), if the specified server is not already running, the Starter try to start it. • On request : • A server (or all servers in a level), can be started using a command on Starter device. • Automatic re-start : • A class property can be define to enable this feature. • If a server, started by the Starter, fails (kill signal, core dump, …), the Starter re start it automatically. • The server has to be running for a while (defined by the class property) • The failed and start are stored in a file (for further statistics)

Demo Astor • Overview • Start/stop • Configure • add • Debug • Etc…

Tango Administrative Tools • Astor – Tango manager client : • This graphical client, is a java swing frame containing a tree to display the control system status. • The host status, read from the Starter, is displayed using coloured icons. • For each host, a specific window displays servers status using coloured icons.

Tango Administrative Tools • Astor – Tango manager client : WARNING: � The displayed state is the server state and not the device state ! � A server is able to serve several devices and one icon cannot display all device states or a combination of them. �

Tango Administrative Tools • Astor – Action on server : • Start/Stop server • Set control level. • Configure attribute polling. • Display device dependencies • Display information (classes, devices, . . . ) • Launch a wizard to configure (as Jive) • Launch a panel to test device • Launch a panel to display state on each device. • Display logs • Display standard error

Tango Administrative Tools • Configure attribute polling :

Tango Administrative Tools • Configure a pool of polling threads : • By default, a single thread is started to poll attributes. • In case of several devices, a pool of threads is available. • Astor proposes a graphic tool to distribute device(s) by thread

Tango Administrative Tools • Configure and test events : • An attribute browser to configure. • An event tester

Tango Administrative Tools • Astor – Logs and statistics : • Start and stop action on Starter are logged in a file and can be displayed. • Start and fails are logged in a another file to compute statistics.

Tango Administrative Tools • Astor – Log. Viewer : • From Astor or from Jive, a tool called Log. Viewer can be launched to display device outputs. • Outputs are time stamped • Outputs can be filtered by levels and by message

Tango Administrative Tools • Configure access control : • Tango provides an access control service. • BUT: today I have not enough time to explain in detail here. • Access in READ is given for everybody. • Access in WRITE is given with restriction on : • Users • IP address • Astor propose a panel to configure it (password needed).

Tango Administrative Tools • Analysis on data from database : Server Usage (useful in case of large number of instances) Global Information on Control System

Tango Administrative Tools

Tango Administrative Tools