Difference between revisions of "Conserver"

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=== ascorbic-acid ===
 
=== ascorbic-acid ===
   
Our Netra T1, ascorbic-acid, has a lights-out management (LOM) system on the first serial port. To access LOM, type '#.' while connected to the console. The LOM prompt is "lom>".
+
Our Netra T1, ascorbic-acid, has a lights-out management (LOM) system on the first serial port. To access LOM, type '#.' while connected to the console.
   
 
Debian GNU/Linux 4.0 ascorbic-acid ttyS0
 
Debian GNU/Linux 4.0 ascorbic-acid ttyS0
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ok go
 
ok go
 
 
ascorbic-acid login:
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ascorbic-acid login:
   
 
=== citric-acid ===
 
=== citric-acid ===

Revision as of 02:55, 26 April 2008

We use Conserver, the "console server daemon", to manage serial consoles for most of our systems. Several systems can be powered on using the serial console, and the others are useful for the accessing the system when the network is misconfigured or down.

The Basics

To get a list of consoles, type "console -x":

% console -x
Enter hobo@caffeine's password: 
 ascorbic-acid            on /dev/ttyS0                       at   9600n
 potassium-citrate        on /dev/ttyS1                       at 115200n
 citric-acid              on /dev/ttyS1                       at   9600n
 [...]

To connect to a console, type "console <name>", replacing name by the name of the console.

% console caffeine
Enter hobo@caffeine's password: 
[Enter `^Ec?' for help]

Debian GNU/Linux 4.0 caffeine ttyS0

caffeine login:

To disconnect, type '^Ec.' That's Control+E followed by 'c' followed by '.'.

caffeine login: [disconnect]

For help on available escape sequences, type '^E?'.

Machine-Specific Hints

ascorbic-acid

Our Netra T1, ascorbic-acid, has a lights-out management (LOM) system on the first serial port. To access LOM, type '#.' while connected to the console.

Debian GNU/Linux 4.0 ascorbic-acid ttyS0

ascorbic-acid login: (press #.)
lom>

For a list of commands, type "help".

lom>help
alarmon
alarmoff
check
console
environment
faulton
faultoff

To get back to the system console, type "console".

lom>console

ascorbic-acid login: 

To pause the system, type "break". This will give you the mystical "ok" prompt.

lom>break

Type  'go' to resume
ok

This prompt has a debugger among other things. To resume normal execution, type "go".

ok go

ascorbic-acid login:

citric-acid

The first serial port on citric-acid is used to access the linux console, the SRM console, and remote console monitor (RCM). SRM is only available when the system is off, and is primarily used to boot the system. RCM can be used while the system is running, and can be used to check the system's status or halt the system.

RCM

To access RCM from the console, type "^]^]rcm".

citric-acid login: (press ^]^]rcm)
RCM>

As usual, type "help" for a list of commands.

RCM>help
halt
haltin
haltout
poweroff
poweron
quit
reset
status

Type "quit" to get back to the linux console:

RCM>quit

Focus returned to COM port

citric-acid login: 

The "halt" command will halt the system immediately and activate the SRM console. Do not use this while the system is running unless absolutely necessary, as it will not shutdown cleanly. Doing a clean "halt" from Linux will also activate the SRM console.

SRM

To access SRM, you must halt the system. When you do, you will be presented with the P00 prompt.

P00>>>

To list the hardware (such as disks) attached to the system, type "show dev".

P00>>>show dev
polling ncr0 (NCR 53C810) slot 1, bus 0 PCI, hose 1 �  SCSI Bus ID 7
dka400.4.0.1.1     DKA400                   RRD43  1084
mka600.6.0.1.1     MKA600                   TLZ10  04a8
polling isp0 (QLogic ISP10X0) slot 2, bus 0 PCI, hose 1   SCSI Bus ID 7
dkb0.0.0.2.1       DKB0                     RZ2EA-LA  N1H1
polling isp1 (QLogic ISP10X0) slot 3, bus 0 PCI, hose 1   SCSI Bus ID 7
dkc0.0.0.3.1       DKC0                     RZ1EF-CB  0372
dkc100.1.0.3.1     DKC100                   RZ2EA-LA  N1H1
polling floppy0 (FLOPPY) PCEB - XBUS hose 0   
dva0.0.0.1000.0    DVA0                      RX23

To show variables, type "show".

P00>>>show
auto_action         	BOOT            
boot_dev            	dkb0.0.0.2.1    
boot_file           	vmunix          
boot_osflags        	0               
boot_reset          	OFF             
bootdef_dev         	dkb0.0.0.2.1    
booted_dev          	dkb0.0.0.2.1    
booted_file         	vmunix          
booted_osflags      	?             
[...]

The most important command is "boot". This starts aboot, the boot loader. Typing boot with no arguments uses the default options in "boot_dev", "boot_file", and "boot_osflags" options. The boot_osflags option is the number of the aboot preset to use. You can also boot with specific options:

P00>>>boot dkb0 -fi /vmlinuz -fl "ro initrd=/initrd.img root=/dev/mapper/vg0-root console=ttyS0,9600"

Alternatively, you can boot a specific aboot preset. Currently the only presets are 0 (default) and 1 (single user).

P00>>>boot dkb0 -fl N

Finally, you can confuse aboot by giving it an invalid preset number. This will give you the aboot prompt.

P00>>>boot dkb0 -fl ?

See Also