Archive for the 'linux' Category

Oct 02 2013

How to Mount SMB/CIFS network share in Linux

Published by under linux,Networking

If you have a Home NAS and if it supports SMB/CIFS shares, then follow the steps below to mount those shares in a Linux System.

Prerequisite   Linux system must have “smbfs” and cifs-utils package installed.

Mount CIFS with the default local filesystem permissions:

 # mkdir /mnt/mntpoint # mount -t cifs //server-name/share-name /mnt/mntpoint -o username=shareuser,password=sharepassword
For Example
 # mount -t cifs //192.168.1.2/myfolder /mnt/mntpoint -o username=shareuser,password=sharepassword

Where,

  • username=shareuser : specifies the CIFS user name.
  • password=sharepassword : specifies the CIFS password. If this option is not given then the environment variable PASSWD is used. If the password is not specified directly or indirectly via an argument to mount, mount will prompt for a password, unless the guest option is specified.

For further details and options, please read linux man page for mount.cifs(8). Also, please note that only root user can mount the filesystems.

If you want a particular filesystem to mounted at boot time, then enter a static information about the filesystem you want to mount in /etc/fstab.

For example, in /etc/fstab you need to enter 6 feilds

“file system to be mounted”   “mount point”  “file type”  “options”  ” dump option” “file system check (fsck) value”

//192.168.1.2/myfolder  /mnt/mntpoint cifs  username=shareuser,password=sharepassword 0 0

if you want any user to mount this file system then do the following

//192.168.1.2/myfolder  /mnt/mntpoint cifs  username=shareuser,password=sharepassword,user 0 0

if you want to provide a resolvable hostname instead of IP address, then ensure that you have cifs-utils is installed. Otherwise you will fail to mount with error code -22 . If you do a dmesg after failure you will see the below message

cifs_mount failed w/return code = -22

 

 

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Jan 18 2009

htpasswd executable for Nginx running on Debian

Published by under linux,Nginx

You need htpasswd executable for enabling password protection in Nginx webserver. Mod_Auth is a core module of Nginx webserver. But it does not come with a htpasswd equivalent tool. Normally people use the htpasswd provided by Apache webserver. If you have not installed apache then chances are that you dont have these tool. I did not have this tool and my search on the internet did not yeild this executable.

So I am sharing the htpasswd executable that I  built on a Debian 4.1 (X86) machine. If you are unable to execute this  on your platform then you need to build from the source.  You can download Apache 2.2 source from this link, from which I built the htpasswd executable.

To build htpasswd executable.

Download and untar the Apache source.

./configure
make
cd httpd2.2.11/support ( htpasswd is in this directory )

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Jan 11 2009

Configuring Samba as a Home File-Server

Published by under linux,Nginx

Samba is a very powerful software that can act as File-server & print-server using SMB/CIFS protocol. Here I describe a Home environment  and provide a appropriate Samba server configuration.

Assumptions

Samba is installed correctly and it execute with out issues.
Samba configuration file is located in /etc/samba
Samba Configuration file name is smb.conf ( This is the default )
Samba is installed on Debian Linux distribution. ( This should not matter much )


Description of the Mr Lingsiva’s Home Environment

  • A Linux server with huge disk-space
  • A Mac desktop system
  • A Windows XP desktop
  • Office Laptop that needs to work in both Office and Home environment
  • A DSL Internet from ISP. DSL model Cum wireless router acts as the firewall for Home Network
  • All these computers form a private network behind the firewall and Wifi security is enabled for wireless connections.

Samba File Server Requirements

  • A common folder accessible to all home computers and office laptop while operating under home profile.
  • A private folder for each of the family members
  • The common folder should be available only for the trusted systems. That is,
    the systems I identify as trusted. For example, if one of my friend
    visits my house and plugs his computer in my network, the common folder
    should not be accessible from his computer.
  • Private folder of User A should not be accessible by User B
  • Samba service is only available with in the private network and must not be accessible from the Internet.

Links to Refer

http://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/passdb.html
http://oreilly.com/catalog/samba/chapter/book/index.html

smb.conf File That Satisfies The Above Requirements

[global]
netbios name = squad
server string = Siva’s File Server
invalid users = backup,bin,daemon,games,gnats,irc,list,lp,mail,man,news,proxy,root,sshd,sync,
sys,uucp
workgroup = HOME
os level = 34
valid users = @users
security=user

[common]
browseable = yes
comment = Common folder for family members
path = /path/to/directory
writeable = yes
force group = users
create mode = 770
directory mode = 770
[homes]
browseable = no
read only = no

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Dec 26 2008

Installing Ubuntu/Debian from USB Thumbdrive to a CDDrive-Less and Floppy Less System

Published by under linux,Ubuntu

I wanted to install Ubuntu 8.04  on a system that did not have a CDROM drive and floppy. So  I had to install from a USB stick. Installation from USB stick is not straight forward either. Hence, I thought of sharing how I installed the OS. Please follow the steps below:

  1. Get a USB thumdrive with atleast 1 GB freespace.
  2. Format the drive using Windos Format tool
  3. Download syslinux . Syslinux utility is avilable for both Linux and WIndows. I downloaded Windows version. Follow this link to learn more about SysLinux. Syslinux is used to install the bootloader on the USB Drive
  4. Insert the thumbdrive into your Windows machine and open a command window
  5. Execute  syslinux.exe -m -a -d e: ( Here e: is assumed to be the Drive letter for the USB thumbdrive. ). After this command, you should see syslinux.cfg in the root dir of the thumbdrive.
  6. Download Ubuntu 8.04 ISO image to your local drive.
  7. Using “Winrar” extract the ISO image on to your harddisk. This is needed to copy some files into the USB thumbdrive.
  8. Download initrd.gz and vmlinuz files  for Ubuntu 8.04 ( Hardy ) from this link. These files are required for installing from USB Thumbdrive. ( NOTE: If you want to install a different version of OS, Say 8.10, then you need to download these two files that was built for that version of OS. For example, for 8.10, these two files for Ubuntu 8.10 are  here)
  9. Copy the following into USB thumdrive root folder
    1. copy the contents of isolinux into the root dir of USB thumbdrive. (To be unambigious:  isolinux is a folder you get when you extract the 8.04 iso image  )
    2. create a directory named “install” and copy “initrd.gz” and “vmlinuz”  into this folder.
    3. copy the whole 8.04 iso image into the USB thumdrive. ( To be unambiguous: You need to copy the whole ISO image and NOT the extracted files )
  10. Rename isolinux.cfg to syslinux.cfg
  11. Plug in your USB thumbdrive
  12. Power your  system  (Make sure that you have set your Bios to boot from USB-HDD )
  13. Ubuntu install screen will be presented and follow the instructions to complete Ubuntu 8.04 Installation

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Jan 25 2008

How to install webmin on Linux

Published by under linux,Ubuntu

WEbmin is an excellent tool to do Unix/Linux System Adminstratio/Configuration. The configuration interface is just a plain internet browser. Moreover it is free as well.
Visit Webmin to download the webmin package for your linux/unix distribution.

Here, i have used Ubuntu/Debian Distribution.
First, install the webmin package. If the webmin install package is in .deb format, then issue the below command

sudo dpkg –install webmin_1.390.deb

If the required perl modules are already installed, then you will not see any dependency errors. If you do see, then you need to install all the dependency.
i am installing the whole perl and other perl modules required by webmin.

sudo apt-get install perl libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl libmd5-perl

Now run
sudo dpkg –install webmin_1.390.deb

You should be all set now.

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Jan 23 2008

Setting up apt-get, wget to use http-proxy

Published by under linux

If you are inside a corporate network, the chances are that you can only access the internet through the http-proxies.

This snippet shows you how to setup the proxy address for apt-get, wget and such programs to access internet.

First method:

In Bash Command Shell, execute

export http_proxy=http://proxy-address:portnumber

proxy-address is your proxy server address.

For example if your proxy server address is proxy1.mydomain.com and port is 8080 then

export http_proxy-http://proxy1.mydomain.com:8080

Second Method

in .bashrc file , type the following

http_proxy=http://proxy-address:portnumber

export http_proxy

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