extracting files form .iso images on Linux and Solaris

To view the file contents inside a .iso file

Linux:
mkdir /mnt/iso
mount -o loop image.iso /mnt/iso

ls -al /mnt/iso to view files

or

Solaris:
mount .iso file as device
lofiadm -a /solaris10/iso/sol-10-u7-ga-x86-v1.iso /dev/lofi/1

mount device to file system
mount -F hsfs -o ro /dev/lofi/1 /mnt

ls -al /mnt to view files



it support london since 1990

Updated Redhat Virtualisation slides

After a recent webinar here is some interesting slides detailing how Redhat Virtualisation has progressed to date

http://www.infrasup.com/downloads/redhat-virtualisation-jan-2011.pdf

see page 19 for a price comparison


it support london Since 1990

Linux: search files hogging space on server files system

Ever had a server with a full File system and unsure where the issue is ?

use the command below to show disk usage in size order

as superuser

du -sk /* |sort -nr

Enjoy !


it support london Since 1990

Install Redhat 6 Beta

We had issue with the grahics card and harddrive we were trying to use for the lastest Redhat 6 installation ( beta)

To get round these issues use a harddrive which is supported by your PC bios ie under 500MB
Some large disk 2TB are not supported fully by the system BIOS

Secondly you can install RHEL6 remotely via vnc client

to do this edit the Grub options on startup a vnc server from installation DVD like:

vnc vncpassword=Rem0teinstall ip=172.16.55.10 netmask=255.255.0.0 gateway=172.16.0.1

Then you can simply connect you vnc client to the vnc install server to manually run the install program

infrasup Technology Blog now on Facebook

All new post's and facebook updates can be found by following us at

http://www.facebook.com/pages/Infrasup-IT-support-london/113172508750779

apple Mac create usb boot disk from .iso

Download the .iso image or copy to your Mac

open 'Terminal' from applications/utilities

in terminal navigate to the downloaded iso

ie

cd /Downloads

then create .img from .iso

'hdiutil convert -format UDRW -o bootcdrom-image.img boot-cdrom-iso.iso'

MacOSX tends to add .dmg to end of name

next insert usb flash drive and list all devices to determine the usb flash device name

diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *160.0 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_HFS data 80.0 GB disk0s2

3: Apple_HFS Untitled 2 79.5 GB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: FDisk_partition_scheme *1.0 GB disk1

1: DOS_FAT_32 MULTIBOOT 1.0 GB disk1s1

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: bootcdrom-image *729.7 MB disk2

in our case above usb disk is /dev/disk1 (1GB disk)

unmount the usb drive

i.e

diskutil unmountDisk /dev/disk1

Unmount of all volumes on disk1 was successful

create usb image of .dmg file created earlier

sudo dd if=./bootcdrom-image.img.dmg of=/dev/rdisk1 ( note /dev/rdisk1 and not /dev/disk1 as shown in diskutil list)

wait for some time for copy to complete.

To check progess you could open a new terminal window and type 'iostat 5'

you wil see stats update for disk 0 and disk 1 ( in our case) hard drive to usb drive whilst copy if going on

disk0 disk1 disk2 cpu load average

KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us sy id 1m 5m 15m

28.01 61 1.67 0.50 79 0.04 1.29 0 0.00 5 6 88 0.91 0.53 0.34

76.66 22 1.63 0.50 1970 0.96 0.00 0 0.00 2 40 59 0.92 0.54 0.35

108.34 9 0.99 0.50 1996 0.97 0.00 0 0.00 2 37 61 0.93 0.55 0.35

350.32 4 1.30 0.50 1147 0.56 0.00 0 0.00 3 22 75 0.85 0.54 0.35

23.90 40 0.93 0.50 1598 0.78 0.00 0 0.00 0 34 66 0.94 0.56 0.36

227.26 8 1.69 0.50 1989 0.97 0.00 0 0.00 2 37 61 0.95 0.57 0.36

55.97 41 2.23 0.50 1997 0.98 0.00 0 0.00 2 37 62 0.95 0.58 0.36

37.38 47 1.71 0.50 2007 0.98 0.00 0 0.00 2 37 61 0.96 0.58 0.37

45.29 42 1.84 0.50 1986 0.97 0.00 0 0.00 3 37 60 0.96 0.59 0.37

35.61 57 1.97 0.50 1993 0.97 0.00 0 0.00 2 37 61 0.88 0.58 0.37

after the dd has complete you can close down the mac and remote the usb flash drive

you'll see something like.....

1425188+0 records in

1425188+0 records out

729696256 bytes transferred in 742.131480 secs (983244 bytes/sec)

you can close down the mac and remote the usb flash drive

then you can plug in usbdrive to mac or pc to boot from

it support london Since 1990

MAC how to change hostname on command line via Terminal

To change your Mac's Fully Qualified Hostname open a terminal window, and become superuser

su ( then type your su admin password)

or

sudo the command below

First type 'hostname'

your hostname will look something like

sh-3.2# hostname

mymac.local

To change this to your desired dns domain name

type

scutil --set HostName mymac.mynewdomain.co.uk

or

sudo scutil --set HostName mymac.mynewdomain.co.uk ( if you havent already become su)

Then type 'hostname' again to check the change

sh-3.2# hostname

mymac.mynewdomain.co.uk

IT Support London since 1990