Question

Rebuild the Kernal

Asked by: mmatharu

Hi,

How would i rebuild the kernal with the following:

Parameter Solaris
MSGMAX 8192
MSGMNB 16384
SEMMNS 111
SEMMSL 111
SEMMNI 20
MAXUPROC 100 perCPU
NOFILES 1000

Thanks

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Asked On
2007-01-07 at 09:26:47ID22113931
Tags

solaris

,

maxuproc

Topic

Sun Solaris

Participating Experts
3
Points
250
Comments
6

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Answers

 

by: gripePosted on 2007-01-07 at 09:37:04ID: 18262406

You don't actually need to rebuild the kernel to set these, you can set them in the /etc/system file and they will take affect on boot. Here is a guide on the parameters you can set in /etc/system: (There's quite a few of them)

http://docs.sun.com/app/docs/doc/817-0404/6mg74vs90?a=view

You should be very careful when modifying /etc/system. Improper values will cause your system to be unable to boot.




 

by: gripePosted on 2007-01-07 at 09:45:24ID: 18262443

I believe what you need to add is: (Please double/triple check before applying to a live system)

set msgsys:msginfo_msgmax=8192    # MSGMAX
set msgsys:msginfo_msgmnb=16384  # MSGMNB
set semsys:seminfo_semmns=111      # SEMMNS
set semsys:seminfo_semmsl=111       # SEMMSL
set semsys:seminfo_semmni=20         # SEMMNI
set maxuproc=XXX                              # MAXUPROC (I don't know how many processors you have)
set rlim_fd_max=1000                        # NOFILES (maximum)

These all seem like very small values. Please confirm that these are indeed what you should be setting these parameters to. Also, ensure you take a backup of your existing /etc/system in case you need to recover later.


set msgsys:msginfo_msgmni=31
set msgsys:msginfo_msgssz=64
set msgsys:msginfo_msgtql=1024
set semsys:seminfo_semmns=

 

by: mmatharuPosted on 2007-01-07 at 10:57:01ID: 18262690

how would i do this:

ensure you take a backup of your existing /etc/system in case you need to recover later.

 

by: gripePosted on 2007-01-07 at 11:02:42ID: 18262709

Copy it to another filename and use boot -a to specify the old file if the system fails to boot with the new one.

 

by: ahoffmannPosted on 2007-01-07 at 12:37:38ID: 18263020

don't forget
  touch /reconfigure
after changing /etc/system and before rebooting

 

by: jhartzenPosted on 2007-01-10 at 03:17:19ID: 18282946

I agree that those values looks dangerously low.  Especially maxuproc and rlim_fd_max .... Are you trying to impose security on a system with many users?

For each value, you need to do the following:
1) Check if a setting for the parameter has already been set in the /etc/system file.
2) If so, use the LARGER of the two settings!!!
3) Unless it is a xxxMIN setting, in which case you you the LOWER of the two values.
4) Use * to comment-out the older setting, and add a new line with the new setting

Some Notes:
touch /reconfigure is not needed for changes in /etc/system, only for changes to the device tree.
Do NOT put the # COMMENTs at the end of the lines into your /etc/system file.  this file uses * to mark a comment and entire lines must be commented, not only the end of a line.
I want to stress wat mmatharu said, copy the /etc/system file before you make any changes to it, eg
cp /etc/system /etc/system_original

20120131-EE-VQP-002

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