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15.12 Scripts for Managing Slaves
When the
console server
s are cascaded the Master is in control of the serial ports on the Slaves, and the
Master’s Management Console provides a consolidated view of the settings for its own and all the
Slave’s serial ports. The Master does not provide a fully consolidated view, for example,
Status: Active
Users
only displays those users active on the Master’s ports and you will need to write a custom bash
script that parses the port logs if you want to find out who’s logged in to cascaded serial ports from the
master.
You will probably also want to enable remote or USB logging, because local logs only buffer 8K of data
and don’t persist between reboots.
This script would, for example, parse each port log file line by line, each time it sees
'LOGIN: username'
,
it adds username to the list of connected users for that port, each time it sees
'LOGOUT: username'
it
removes it from the list. The list can then be nicely formatted and displayed. You can run the script on
the remote log server. To enable log storage and connection logging:
- Select
Alerts & Logging: Port Log
-
Configure
log storage
- Select
Serial & Network: Serial Port
,
Edit
the serial port(s)
- Under
Console server
, select
Logging Level 1
and click Apply
There’s a useful tutorial on creating a bash script CGI at
http://www.yolinux.com/TUTORIALS/LinuxTutorialCgiShellScript.html
Similarly, the Master does maintain a view of the status of the slaves:
- Select
Status: Support Report
- Scroll down to
Processes
- Look for:
/bin/ssh -MN -o ControlPath=/var/run/cascade/%h slavename
- These are the slaves that are connected
- Note the end of the Slaves' names will be truncated, so the first 5 characters must be unique
Alternatively, you can write a custom CGI script as described above. The currently connected Slaves can
be determined by running:
ls /var/run/cascade
and the configured slaves can be displayed by running:
config -g config.cascade.slaves
