User:Scott/02

Tech Support

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Home Page      user:scott
Tech Support   user:scott/02
Dir & Files    user:scott/03
Network        user:scott/04
Troubleshoot   user:scott/05
Laptops        user:scott/06
Resources      user:scott/07
Notes          user:scott/08 
Open-SSH       user:scott/09
A.T            user:scott/22

Password

Backup Password

• cp /etc/shadow /etc/shadow.bak - (hash of root + user)
• cat /etc/passwd (UID + GID)

Change Password

passwd [username]
passwd –e [username] – (change on startup)

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User Name (Add-Delete)

adduser [username]
adduser [username] admin
userdel [username]

Updates & Fix Broken Packages

apt-get update
apt-get dist-upgrade

apt-get install --fix-broken
apt-get autoremove
apt-get install ubuntu-desktop

apt-get purge xxx

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File System Check

fdisk -l

fsck -fyv /dev/sda1 (f=force y=fix)

shutdown -rF now (reboot, forcing fsck on root filesystem)

Mount & Un-Mount Devices

df -h          (show boot partition)
ls /media      (device mounted from GUI)
cat /etc/fstab (partitions and devices that mount on start-up)

mount 

mount /dev/sdb1 /mnt/xxx

umount /dev/sdb1 (sudo)

FSTAB - Mount HDD

mount HDD

sudo mount to see what is mounted
sudo mount -a to mount all entries in fstab

un-mount drive (close apps using drive first)

sudo mkdir /media/sjn8GigMount

sudo fdisk -l or Disk utility to get "Device Name" such as (/dev/sdc1)

gksudo gedit /etc/fstab

select Edit -> Preferences -> Editor
create a backup copy before saving file

Example 1. old-school
[device]    [mount point]     [file system]  [options]      	         [dump] [fsck order]
/dev/sdb1   /mnt/sjn8GigMount   auto         rw.username.auto.exec.utf8   0        0

Example 2. new-school
[device]               [mount point]    [file system]  [options]              [dump][fsck order]
UUID=34C4DFF9C4DF8876  /mnt/sjn8GigMount   auto         rw.username.auto.exec.utf8   0        0

#File Systems [auto] [ext4] [jfs] [reiser4] [swap] [iso9660] [FAT 32] [NTFS]
#Note [ntfs-3g] necessary for write access

Re-Start machine

Mount - NTFS HDD(on tsbackup)

sudo ntfs-config (open + and dbl clk on device)
see - "Mounting_Disks.README" on Desktop

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Badblocks

badblocks -nvs /dev/sda1

Network Backup Procedures

Network_backup_wiki.freegeek

Backup a Home Directory

• date format (e.g. 20121223 for Dec 23 2012)

ssh into backup server

ssh tsbackup@tsbackup
ls /var/tsbackup
ssh -XC tsbackup@tsbackup (.fglan nautilus)
ctrl-c (to back-out)

ssh to tsbackup - nautalus

ssh://tsbackup@tsbackup

rsync from customer box

sudo cp /etc/passwd /etc/shadow /etc/group /home/
dpkg --get-selections > dpkg.out
sudo mv dpkg.out /home/
sudo tar -czf /home/etc.backup.tar.gz /etc/
sudo rsync -avzh /home/ tsbackup@tsbackup:/var/tsbackup/[date-ticketnumber] 2>rsync.log

less rsync.log (view error log)

Note: on the '''data recovery box''' 
      determine mount point of device to backup
      use "fdisk l" or "Disk utility"
      mount /mnt/sdb?

      add /mnt/sdb? in front of /home 
      this avoids the need to chroot.

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rsync from tsData box

sudo cp /mnt/sdb?/etc/passwd /mnt/sdb?/etc/shadow /mnt/sdb?/etc/group /mnt/sdb?/home/
dpkg --get-selections --admindir=/mnt/sdb?/var/lib/dpkg >dpkg.out
sudo mv dpkg.out /mnt/sdb?/home/
sudo tar -czf /mnt/sdb?/home/etc.backup.tar.gz /mnt/sdb?/etc/
sudo rsync -avzh /mnt/sdb?/home/ tsbackup@tsbackup:/var/tsbackup/[date-ticketnumber] 2>rsync.log

Restore from Backup

sudo rsync -avzh  tsbackup@tsbackup:/var/tsbackup/[date-ticketnumber]/ /home
sudo dpkg --set-selections < /home/dpkg.out
sudo apt-get -u dselect-upgrade

copy (user passwd) hash from original /etc/shadow

Restore User Permissions

• Create a New User (oem or Bob or Mark) - with Admin. Privileges

Change From: drwxr-xr-x 23 1001 1001 4096 2011-07-07 13:28 oem

Change To:   chown -R oem:oem /home/oem (recursively for all sub directories)

File Permissions

chmod 774 dir-name (dir)   rwxrwxr--
chmod 664 filename (files) rw-rw-r--

chmod ugo+rwx /dir/file
chmod ugo-rwx /dir/file

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Stress Test CPU and Chipset

• CPU Temperature

stress --cpu 8 --io 4 --vm  2 --vm-bytes 128M  --timeout 4h

(add --hdd 2 to stress the hard drive as well, though this shouldn't be necessary)

Temperature Test/Display

while  true  ; do uptime ; sensors ; sleep 30s; done | tee temp_load.log

Load lm sensor "utility to read temp/fan" 
-from software center 

Hardware & Resource Identification

lshw

sudo lshw (hardware config)

CPU

cat /proc/cpuinfo or more /proc/cpuinfo

Disk Usage

du -sh (-s disk usage)
du -sh /home/bob/Downloads/ (disk usage for Downloads)

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Available Memory

free –l (available memory)

cat /proc/meminfo

Devices in Use

To see a list of devices currently in use

cat /proc/devices

AlsaMixer

alsamixer

Printer Linux Foundation

http://www.linuxfoundation.org/
Workgroups -> Open Printing -> Printers

HPLIP

http://hplipopensource.com/hplip-web/downloads.html

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WineHQ Database

http://www.winehq.org/

wineDB

Download-Wine

Burn DVD tsbackup

wodim dev=/dev/sr1 isodir/DiscSpan_15.iso (15 = disk #)
;beep