Crash Dump

The hardware watchdog mechanism can automatically reboot the system in case the system hangs. This can be done with or without first generating an automated crash dump file. As superuser, do one of the following:


•To reboot without generating an automated crash dump file, type:


# eeprom error-reset-recovery=boot



•To reboot and generate an automated crash dump file, type:


# eeprom error-reset-recovery=sync

Adding SWAP space in ZFS Root filesystem

If you want additional space
# zfs create -V 2G rpool/swap1
# swap -a /dev/zvol/dsk/rpool/swap1
# swap -l

If you want to delete old swap space and add new one

# swap -d /dev/zvol/dsk/rpool/swap
# swap -l (To verify old swap is deleted)
# zfs set volsize=4G rpool/swap
# swap -a /dev/zvol/dsk/rpool/swap
# swap -l

Upgrade firmware on one of the IOM in storage Array

-> We replaced IOM.A on the Storage Arrays and there is mismatch in IOM's

Name Model Current Baseline
Tray.86.IOM.A LCSM100_E 0196 0196
Tray.86.IOM.B LCSM100_E 0196 0196
Tray.87.IOM.A LCSM100_E 0166 0196
Tray.87.IOM.B LCSM100_E 0196 0196

Login to the server which Common Array Manager installed

execute csmservice command (usually located under fms/bin directory)

./csmservice -s
Enter array name

it will give options (Enter 5 which is download IOM firmware)

Enter path to IOM formware: /esm0196.esm

Available components for install (Select the IOM from the list )

Error while luactivate

/usr/sbin/luactivate: /etc/lu/DelayUpdate/: cannot create

Workaround:
execute folloing:

# export BOOT_MENU_FILE="menu.lst"

Changing hostname on Solaris

--> Change the name in /etc/nodename.
--> Change the name in /etc/hostname.xl0 (where xl0 is the name of your network interface)
--> Change the name in /etc/hosts.
--> Change the path in /etc/dumpadm.conf
--> Run the command: hostname new_hostname

Configuring LDAP client in Linux

# authconfig-tui

enable following option in the fist screen
[x] use LDAP

enabloe following options in the screen screen
[x] use MD5 passwords
[x] use shadow passwords
[x] use LDAP Authentication

server: LDAP://ldapserver.com/
BaseDN: dc=com,dc=somthing........

save the configuration and reboot the system or restart the service.

Changing hostname in Linux

Change the name in /etc/hosts file
and also edit following file and change the hostname

vi/etc/sysconfig/network
» Look for HOSTNAME=xxxxxx

Reboot the system or service xinetd restart

Network debugging in Linux

$ dmesg|grep eth0
$ less /etc/sysconfig/network
$ less /etc/sysconfig/network-scripts/ifcfg-eth0
$ ifconfig eth0 down/up
$ netstat -rn
$ service network restart
$ ping -c4 somewebsitetotest.com
$ traceroute somewebsitetotest.com

Requesting VeriSign Cert on Apache

Go to APACHE/bin Home directory

cd $APACHIE_HOME\bin

$ openssl genrsa -out server.key 1024

$ OpenSSL req -new -key server.key -out server.csr -config openssl_default.cnf

Enter values (as per the requirement)

Send server.csr contens to VerSign for Signed cert.

getting LUN information on solaris

luxadm display /dev/rdsk/cXXXXXXXXXXXXXXXXXXs2

Setup SCP between hosts

1) Make sure id is created/available on both hosts (For following example Server names are "Ahost" and "Bhost" and the user is "test").
2) Login to Server Ahost and execute following commands with the user test if .ssh directory is not available
--> ssh-keygen -t rsa
Select default values
--> cd .ssh
scp id_rsa.pub Bhost:~test/.ssh/authorized_keys
scp id_rsa.pub Ahost:/apps/sasavr/.ssh/authorized_keys
(Note: if .ssh directory is not available on destination servers, create this directory on Ahost and Bhost)

Login to Ahost and Bhost with test user
--> chmod 700 .ssh
--> cd .ssh
--> chmod 600 authorized_keys

After executing all commands, we can scp from Ahost to Bhost without password for test user.

Remove a weblogic from windows service

Paste following contents in new file, change variables according to the domain and execute it

@echo off
SETLOCAL

set WL_HOME=C:\bea\weblogic91
set PROD_NAME=BEA Products
set BAR_WL_HOME=C_bea_weblogic91
set SERVER_NAME=SERVER_NAME
set DOMAIN_NAME=DOMAIN_NAME


rem *** Uninstall the service
"%WL_HOME%\server\bin\beasvc" -remove -svcname:"beasvc %DOMAIN_NAME%_%SERVER_NAME%"

ENDLOCAL

NFS Setup on Solaris

NFS Setup on Solaris

NFS Server Setup
----------------
1) /etc/rc.d or /etc/init.d
/usr/sbin/portmap or rpc.portmap

2) /etc/dfs/dfstab

share -F nfs -o rw=nfsclient: /export/nfs

3) /etc/dfs/sharetab

/export/nfs - nfs rw=nfsclient

4) /etc/dfs/fstypes

nfs NFS Utilities

5) /etc/rmtab lists filesystems that are remotely mounted by clients.

6) mountd rpc.mountd
nfsd rpc.nfsd

7) /usr/sbin/share (and chomod a+rx)

#!/bin/sh
killall -HUP /usr/sbin/rpc.mountd
killall -HUP /usr/sbin/rpc.nfsd
echo re-exported file systems

(Run script after modifying /etc/exports)

8) rpcinfo -p (to check mountd and nfsd running)


NFS Client Setup
----------------

1) To make the system mount a nfs file system upon boot

/etc/vfstab

nfsserver:/export/nfs - /mnt/nfs nfs - yes -

2) /etc/mnttab lists filesystems which are currently mounted on
onto that client.

3) To mount:

ESX Server becomes disconnect and attempt to reconnect fail.

ESX Server becomes disconnect and attempt to reconnect fail.

One reason is the ESX services become hung.

Run the following to fix the issue:
service mgmt-vmware restart
service vmware-vpxa restart

If these don't correct the problem then run
service mgmt-vmware stop
service vmware-vpxa stop
ps -ef | grep hostd
kill -9

Further research required.

Disable alerts on ALOM

sc>showsc
sc>setsc if_emailalerts false
sc>showsc

ulimit Error - ulimit: open files: cannot modify limit

-> Login to the server and check parameters by using plimit command

bash-3.00# plimit $$
25169: bash -l
resource current maximum
time(seconds) unlimited unlimited
file(blocks) unlimited unlimited
data(kbytes) unlimited unlimited
stack(kbytes) 8192 unlimited
coredump(blocks) unlimited unlimited
nofiles(descriptors) 1024 1024
vmemory(kbytes) unlimited unlimited

It means you can not change value more than 1024. You can change max value by using


bash-3.00# plimit -n 10000 $$
Now it is set to 10000

bash-3.00# plimit $$
25505: bash -l
resource current maximum
time(seconds) unlimited unlimited
file(blocks) unlimited unlimited
data(kbytes) unlimited unlimited
stack(kbytes) 8192 unlimited
coredump(blocks) unlimited unlimited
nofiles(descriptors) 10000 10000
vmemory(kbytes) unlimited unlimited


Now you can ulimit to set 10000

# ulimit -a
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
open files (-n) 10000
pipe size (512 bytes, -p) 10
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 29995
virtual memory (kbytes, -v) unlimited

Explorer with LOM information on 2900

/opt/SUNWexplo/bin/explorer -w default,1280extended

Clearing faults

2) #fmadm repair
# fmadm repair 03351534-e325-cf5d-81ae-e3fc8be83e5b
3) # cd /var/fm/fmd
# cd /var/fm/fmd && rm errlog fltlog ckpt/eft/* rsrc/*
(rm errlog fltlog ckpt/eft/* rsrc/*)
4) # fmadm reset cpumem-diagnosis
5) # fmadm reset cpumem-retire
6) # fmadm reset eft
7) # fmadm reset io-retire
# init 6

After these steps check to see if problem still exit.

# fmadm faulty