Saturday, February 28, 2009

Ono što može da iznervira prosečnog korisnika odličnog Lenny-ja...

... jeste par "sitnih" bug-ova, koji će najverovatnije biti ispravljeni u narednom update-u distroa. Prvi i najčudniji je bug koji se tiče rada numlock LE diode, koja radi inverzno, tj. numerička tastatura je uključena kada dioda ne svetli. Bug je odavno dokumentovan ali, koliko je meni poznato, nema jedinstvenog rešenja za ovu "sitnicu". Problem se može naći pod sledećim "imenima":
  1. Bug#493069

  2. Bug#482592

  3. Bug#475330

Problem nije vezan za specifičan distro (Arch Linux korisnici su primetili isto :)) ili za menadžer prozora (KDE, GNOME, i druge ), a pravi uzrok nije poznat. Ne postoji jednoznačno rešenje za ovaj problem, a ima nekoliko predloga sa raznih foruma (debian.net, gore pomenuti Arch forum i sl.)... Sa

Slučaj Samba...

Problem sa konfigurisanjem samba-e iz Control Center-a je mnogo ozbiljnije prirode ako ste korisnik koji nije baš raspoložen za kuckanje po konfiguracionim fajlovima ili Linux početnik. Problem je prijavljen na Ubuntu Lounchpad sajtu (Bug #276715 ) i vezuje se za bug u okviru starijih samba paketa, a rešava se, kako kažu web izvori (forumi i sl.), instalacijom najnovije verzije samba-e... Pošto imam poverenja u Debian i buduće ispravke koje će uskoro biti raspoložive putem interneta, nisam hteo da instaliram samba-u iz izvornog koda, već sam pribegao dobrom starom prčkanju po smb.conf fajlu (lokacija /etc/samba/) i rešio problem...

Promene u smb.conf fajlu su obeležene crvenom bojom:


#============= Global Settings ==============

[global]

## Browsing/Identification ###

# Change this to the workgroup/NT-domain name your Samba server will part of
workgroup = IME RADNE GRUPE

# server string is the equivalent of the NT Description field
server string = Bilo šta

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable its WINS Server
# wins support = no

# WINS Server - Tells the NMBD components of Samba to be a WINS Client
# Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
; wins server = w.x.y.z

# This will prevent nmbd to search for NetBIOS names through DNS.
dns proxy = no

# What naming service and in what order should we use to resolve host names
# to IP addresses
; name resolve order = lmhosts host wins bcast

#### Networking ####

# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
; interfaces = 127.0.0.0/8 eth0

# Only bind to the named interfaces and/or networks; you must use the
# 'interfaces' option above to use this.
# It is recommended that you enable this feature if your Samba machine is
# not protected by a firewall or is a firewall itself. However, this
# option cannot handle dynamic or non-broadcast interfaces correctly.
; bind interfaces only = yes



#### Debugging/Accounting ####

# This tells Samba to use a separate log file for each machine
# that connects
log file = /var/log/samba/log.%m

# Cap the size of the individual log files (in KiB).
max log size = 1000

# If you want Samba to only log through syslog then set the following
# parameter to 'yes'.
# syslog only = no

# We want Samba to log a minimum amount of information to syslog. Everything
# should go to /var/log/samba/log.{smbd,nmbd} instead. If you want to log
# through syslog you should set the following parameter to something higher.
syslog = 0

# Do something sensible when Samba crashes: mail the admin a backtrace
panic action = /usr/share/samba/panic-action %d


####### Authentication #######

# "security = user" is always a good idea. This will require a Unix account
# in this server for every user accessing the server. See
# /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/ServerType.html
# in the samba-doc package for details.
security = share

# You may wish to use password encryption. See the section on
# 'encrypt passwords' in the smb.conf(5) manpage before enabling.
encrypt passwords = true

# If you are using encrypted passwords, Samba will need to know what
# password database type you are using.
passdb backend = tdbsam

obey pam restrictions = yes

# This boolean parameter controls whether Samba attempts to sync the Unix
# password with the SMB password when the encrypted SMB password in the
# passdb is changed.
unix password sync = yes

# For Unix password sync to work on a Debian GNU/Linux system, the following
# parameters must be set (thanks to Ian Kahan < for
# sending the correct chat script for the passwd program in Debian Sarge).
passwd program = /usr/bin/passwd %u
passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .

# This boolean controls whether PAM will be used for password changes
# when requested by an SMB client instead of the program listed in
# 'passwd program'. The default is 'no'.
pam password change = yes

########## Domains ###########

# Is this machine able to authenticate users. Both PDC and BDC
# must have this setting enabled. If you are the BDC you must
# change the 'domain master' setting to no
#
; domain logons = yes
#
# The following setting only takes effect if 'domain logons' is set
# It specifies the location of the user's profile directory
# from the client point of view)
# The following required a [profiles] share to be setup on the
# samba server (see below)
; logon path = \\%N\profiles\%U
# Another common choice is storing the profile in the user's home directory
# (this is Samba's default)
# logon path = \\%N\%U\profile

# The following setting only takes effect if 'domain logons' is set
# It specifies the location of a user's home directory (from the client
# point of view)
; logon drive = H:
# logon home = \\%N\%U

# The following setting only takes effect if 'domain logons' is set
# It specifies the script to run during logon. The script must be stored
# in the [netlogon] share
# NOTE: Must be store in 'DOS' file format convention
; logon script = logon.cmd

# This allows Unix users to be created on the domain controller via the SAMR
# RPC pipe. The example command creates a user account with a disabled Unix
# password; please adapt to your needs
; add user script = /usr/sbin/adduser --quiet --disabled-password --gecos "" %u

# This allows machine accounts to be created on the domain controller via the
# SAMR RPC pipe.
# The following assumes a "machines" group exists on the system
; add machine script = /usr/sbin/useradd -g machines -c "%u machine account" -d /var/lib/samba -s /bin/false %u

# This allows Unix groups to be created on the domain controller via the SAMR
# RPC pipe.
; add group script = /usr/sbin/addgroup --force-badname %g

########## Printing ##########

# If you want to automatically load your printer list rather
# than setting them up individually then you'll need this
load printers = yes

# lpr(ng) printing. You may wish to override the location of the
# printcap file
; printing = bsd
; printcap name = /etc/printcap

# CUPS printing. See also the cupsaddsmb(8) manpage in the
# cupsys-client package.
printing = cups
printcap name = cups

############ Misc ############

# Using the following line enables you to customise your configuration
# on a per machine basis. The %m gets replaced with the netbios name
# of the machine that is connecting
; include = /home/samba/etc/smb.conf.%m

# Most people will find that this option gives better performance.
# See smb.conf(5) and /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/speed.html
# for details
# You may want to add the following on a Linux system:
# SO_RCVBUF=8192 SO_SNDBUF=8192
# socket options = TCP_NODELAY

# The following parameter is useful only if you have the linpopup package
# installed. The samba maintainer and the linpopup maintainer are
# working to ease installation and configuration of linpopup and samba.
; message command = /bin/sh -c '/usr/bin/linpopup "%f" "%m" %s; rm %s' &

# Domain Master specifies Samba to be the Domain Master Browser. If this
# machine will be configured as a BDC (a secondary logon server), you
# must set this to 'no'; otherwise, the default behavior is recommended.
# domain master = auto

# Some defaults for winbind (make sure you're not using the ranges
# for something else.)
; idmap uid = 10000-20000
; idmap gid = 10000-20000
; template shell = /bin/bash

# The following was the default behaviour in sarge,
# but samba upstream reverted the default because it might induce
# performance issues in large organizations.
# See Debian bug #368251 for some of the consequences of *not*
# having this setting and smb.conf(5) for details.
; winbind enum groups = yes
; winbind enum users = yes

# Setup usershare options to enable non-root users to share folders
# with the net usershare command.

# Maximum number of usershare. 0 (default) means that usershare is disabled.
; usershare max shares = 100

#======================= Share Definitions =======================

[homes]
comment = Home Directories
browseable = yes

# By default, the home directories are exported read-only. Change the
# next parameter to 'no' if you want to be able to write to them.
read only = yes

# File creation mask is set to 0700 for security reasons. If you want to
# create files with group=rw permissions, set next parameter to 0775.
create mask = 0775

# Directory creation mask is set to 0700 for security reasons. If you want to
# create dirs. with group=rw permissions, set next parameter to 0775.
directory mask = 0775

# By default, \\server\username shares can be connected to by anyone
# with access to the samba server.
# The following parameter makes sure that only "username" can connect
# to \\server\username
# This might need tweaking when using external authentication schemes
valid users = %S

# Un-comment the following and create the netlogon directory for Domain Logons
# (you need to configure Samba to act as a domain controller too.)
;[netlogon]
; comment = Network Logon Service
; path = /home/samba/netlogon
; guest ok = yes
; read only = yes
; share modes = no

# Un-comment the following and create the profiles directory to store
# users profiles (see the "logon path" option above)
# (you need to configure Samba to act as a domain controller too.)
# The path below should be writable by all users so that their
# profile directory may be created the first time they log on
;[profiles]
; comment = Users profiles
; path = /home/samba/profiles
; guest ok = no
; browseable = no
; create mask = 0600
; directory mask = 0700

[printers]
comment = All Printers
browseable = no
path = /var/spool/samba
printable = yes
guest ok = no
read only = yes
create mask = 0700

# Windows clients look for this share name as a source of downloadable
# printer drivers
[print$]
comment = Printer Drivers
path = /var/lib/samba/printers
browseable = yes
read only = yes
guest ok = yes

[razmena]
path = /home/ime/korisnika/razmena/
guest ok = yes
public = yes
browsable = yes
writable = yes

Promene se tiču "simple file sharing-a", tj. omogućavanje pristupa jednom direktorijumu u okviru /home direktorijuma bez ikakvog korisničkog naloga i šifre, što je prosto idealno za kućne mreže a nikako se ne preporučije za bilo koju firmu (makar imala i samo dva računara... Za to služe naročita podešavanja smb.conf fajla, ali o tome drugi put... ;)


Friday, February 27, 2009

hplip koska... :)

Instalaciju novog sistema prati i dodavanje odgovarajućih drajvera koji nisu isporučeni zajedno sa njim. Posle bezbolne instalacije grafičkih drajvera za moju NVIDIA grafičku kartu (postupak skoro identičan ovom), usledila je instalacija štampača HP LaserJet P1006.
Ma kako pojednostavljena, instalacija štampača na Linux-u neretko prerasta u aktivnosti na koje smo navikli u filmovima tipa "Mission Impossible". Često je nemoguće objasniti kako se potkradu greške prilikom pisanja drajvera za neke sasvim obične uredjaje kao što su štampači, posebno ako iza projekata stoje firme kao što je HP. Naime, iako su drajveri za Hewlett Packard štampače instalirani zajedno sa sistemom (kad se ne radi expert install Lenny-ja ;) ) i štampač uredno prepoznat, štampač ne reaguje na komande za štampanje, tj. ne radi uopšte.
Da ironija bude veća, postoji tri načina za instalaciju HP štampača i nijedan ne daje rezultate, sve dok se ne instalira famozni "plugin za hp štampače". Dakle, bez obzira da li je štampač instaliran na ovaj ili ovaj način, neće se oglasiti dok se ne preuzme famozni plugin sa nekog tamo hp servera. Treći način podrazumeva instalaciju debian prekompajliranih paketa preko Synaptic-a ili nekog paket menadžera...

Dakle, po instalaciji štampača treba pokrenuti program HPLIP Toolbox i kliknuti na sličicu ispod koje piše Install Required Plugin. Do ovog sjajnog otkrića sam došao koristeći čuvene metode:
  1. "metodu nabadanja", tj. kliktanja na sve moguće dugmiće i sličice
  2. "metodu besomučne reinstalacije drajvera" po principu eliminacije one koja ne donosi rezultate



Na internetu sam našao da i neki korisnici Ubuntu-a imaju sličan problem, čto me je začudilo, jer ako se Debian ne trudi da podešava distro tako da bude "user friendly", Canonical to sigurno čini. Zato mi i nije jasno kako su propustili da testiraju rad jedne od najrasprostranjenijih grupa štampača od jedne od najpoznatijih firmi za proizvodnu istih. Prosto je neverovatno, da i ako je problem uočen a nije rešiv (bar u neko dogledno vreme), niko nije pisao o tome u uputstvima za instalaciju (ni HP, ni Debian a ni Canonical), a problem se lako uočava i još lakše rešava. Drago mi je što sam bar otkrio da štampa na Etch-u nije "sama od sebe proradila"...

Sunday, February 15, 2009

Napokon Lenny!

Posle 22 meseca razvoja, silnih testova i pravno-filizofskih nedoumica na Distrowatch-u se pojavila radosna vest za ljubitelje Debian distroa. Lenny se napokon "stabilizovao" i raspoloživ je za download. Ja sam, naravno, požurio da preuzmem KDE verziju i da je nabacim na svoj hard disk, a utisci o "petici" će biti opisani u sledećim člancima... :-)