Privileged users may send the FATMEN servers management commands to monitor their progress, check that they are active etc. Examples of use are:
Jamie@Cernvm; TELL FMDDDIVR QSPOOL 12:44:53 * MSG FROM FMDDDIVR: I HAVE 0 FILES IN MY RDR Jamie@Cernvm; TELL FMDDDIVR HELLO 12:44:58 * MSG FROM FMDDDIVR: HELLO AND HOW ARE YOU TODAY? Jamie@Cernvm; * See how much disk space CHARM2 service machine has used TELL FMCHARM2 QDISK A 12:45:19 * MSG FROM FMCHARM2: LABEL VDEV M STAT CYL TYPE BLKSIZE FILES BLKS USED-(%) BLKS LEFT BLK TOTAL 12:45:19 * MSG FROM FMCHARM2: CHARM2 191 A R/W 20 3380 4096 6 35-01 2961 3000
Table: List of commands currently supported by the FATMEN service machine
+-HELLO----+-Check-whether-server-is-active.-If-the-server-does-not-------+ | | respond immediately, it means that it is either down, or | | | processing an update. As multiple updates can be grouped | | | together, it can happen that the server does not respond | | | for a considerable period of time to a HELLO | | | message. | | HELP | Displays this list of commands. | | | | | STOP | Stop the server, but does not log it off. | | QDISK | Issue a QUERY DISK command and send the output | | | back to the originator of the message. | | QSPOOL | Return the number of RDR files that the service machine | | | currently has in its reader. | | DROP | Cause the server to call the DROP exec to drop the | | | specified link. | | GIME | Cause an EXEC GIME to be issued. | | CLOSE | Close the console log and spool it to the owner of the | | | service machine. | | NEWLOG | Cause the server to open a new log file. | | PURGE | Purge (delete) journal files. May be sent automatically | | | whenever a backup of the FATMEN RZ file has been taken. | | FATLOG* | This command is issued automatically from the FATMEN user | | | code to log FATMEN activity. | | | | | LOGOFF | Shutdown the service machines prior to system shutdown or | +----------+-other-scheduled-interruption,-such-as-ORACLE-backup.---------+
Each FATMEN server should have at least two entries in their NAMES file. Those on CERNVM may also have a third, FATSERVERS, which points to the list of remote servers who should automatically receive updates from CERNVM.
The two entries that are always required are FATOWNERS and FATOPERATORS. At the present time, usernames in either of these lists are allowed to issue commands in the above table, and receive SMSGs when the servers stop.
Example of NAMES file for the FATMEN server
:nick.FATOPERATORS :list.fatop1 fatop2
:nick.FATOP1 :userid.console
:node.cernvm
:nick.FATOP2 :userid.opsutil
:node.cernvm
:nick.FATOWN1 :userid.fatone
:node.cernvm
:nick.FATOWN2 :userid.wojcik
:node.frcpn11
:nick.FATOWNERS :list.fatown1 fatown2 jamie