Tango Administrative Tools 1

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 2

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, ...). 3

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. 4 4

Tango Control System Manager Get host list DB server Host n Starter server Host n Starter server Host n Starter server Get status DS DS Host n DS Starter server DS DS DS Host n DS DS Starter server Get server list DS DS DS Host n DS DS Starter server DS DS DS Host n DS DS Starter server DS DS DS DS DS DS Host 1 DS DS Starter server DS DS DS DS DS DS DS DS DS DS DS DS DS DS 5

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> 6

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) 7

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. 9

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. 10

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 11

Tango Administrative Tools Configure attribute polling : 12

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 13

Tango Administrative Tools Configure and test events : An attribute browser to configure. An event tester 14

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. 15

Tango Administrative Tools Astor – LogViewer : From Astor or from Jive, a tool called LogViewer can be launched to display device outputs. Outputs are time stamped Outputs can be filtered by levels and by message 16

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). 17

Tango Administrative Tools Analysis on data from database : Server Usage (useful in case of large number of instances) Global Information on Control System 18

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