Linux file system hierarchy

Linux file system hierarchy v1.0

Configure a Network Bridge on Ubuntu Server

Always forget:

How to configure Network Bridge on Ubuntu Server

 

1. Configure DHCP on brO

######################

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#auto eth0
#iface eth0 inet dhcp

auto br0
iface br0 inet dhcp
bridge_ports eth0
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off

######################

 

2. Configure Static IP on brO

######################

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#auto eth0
#iface eth0 inet dhcp

auto br0
iface br0 inet static
address 192.168.1.200
broadcast 192.168.1.255
netmask 255.255.255.0
gateway 192.168.1.254
bridge_ports eth0
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off

######################

Date in ubuntu

Selalu lupa….

1. Install ntp

root@webmail:~# aptitude install ntp

2. Get date from mst.sirim.my

ntpdate mst.sirim.my

3. Set script

root@webmail:~# pico /skrip/takwin

################ cut here ##################

#!/bin/bash
ntpdate mst.sirim.my

################ cut here ##################

4. Set Cron

root@webmail:~# crontab -u root -e

*/50 * * * * /skrip/takwin >/dev/null 2>&1

5. Run takwin

root@webmail:~# /skrip/takwin

28 Oct 19:52:27 ntpdate[1162]: step time server 202.190.26.30 offset 4.735816 sec

Debian Gnome Core GUI

I want to install Debian with basic GUI using GNOME.

Without open office and others things.

Genome Core Issued this command.

apt-get update
apt-get install xserver-xorg-core gdm gnome-core

KDE Core issued this command

apt-get update
apt-get install xserver-xorg-core kdm kde-core

Start the server using this command

Gnome :

/etc/init.d/gdm start

KDE

/etc/init.d/kdm start

 

*** If xserver fail to start issued this command

dpkg-reconfigure xserver-xorg

And specify the driver vesa in section Device inside the /etc/X11/xorg.conf file.

Install Display driver if needed.

Zimbra Server cannot start

My Zimbra wont start …

Check my zimbra server status i get this error:

zimbra@webmail:tail /var/log/zimbra.log 
 zmmtaconfig: Skipping All MTA Authentication Target URLs update. 
zmmtaconfig: Skipping getAllMtaAuthURLs ERROR: service.FAILURE (system failure: ZimbraLdapContext) (cause: javax.net.ssl.SSLHandshakeException sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: timestamp check failed) 

It’s happen when your server certificate expired…. (i know when i google the problem)

The solutions is.

1. Create New Certificte Authority (CA)

root@webmail:~# /opt/zimbra/bin/zmcertmgr createca -new

2. Generate CA expired on 365 days

root@webmail:~# /opt/zimbra/bin/zmcertmgr createcrt -new -days 365

3. Deploy the certificate

root@webmail:~# /opt/zimbra/bin/zmcertmgr deploycrt self

4. Deploy the CA

root@webmail:~# /opt/zimbra/bin/zmcertmgr deployca

5. Verifications certificate

root@webmail:~# /opt/zimbra/bin/zmcertmgr viewdeployedcrt 

 

after all that issued this command in one line

root@webmail:~# /opt/zimbra/java/bin/keytool -import -alias root -keystore /opt/zimbra/java/jre/lib/security/cacerts -storepass changeit -file /opt/zimbra/conf/ca/ca.pem

On the questions Trust the certificate : Yes

After all have done than issued this command

root@webmail:~# su – zimbra

zimbra@webmail:~$ zmcontrol status

zimbra@webmail:~$ zmcontrol stop

zimbra@webmail:~$ zmcontrol start

Ok you ZCS server will run smooth.

Zentyal – Server Administrator

Zentyal is Web Gui Server / firewall sush as pfsense , ClearOS and many more.

The different about Zentyal (knows as e-box) is we can manual istall along with ubuntu 10.04 server editions.

That what i did…Install it without GUI..

If somebody out there need install zentyal with gui you can download it here.

But if you wanna install without GUI / Desktop Version. Use this guide.

1. Install Ubuntu Server 10.04.

Zentyal 2.0 packages

2. Add to your /etc/apt/sources.list:

deb http://ppa.launchpad.net/zentyal/2.0/ubuntu lucid main

In order to authenticate the packages in the PPA you can import its public key with the following command:

apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 10E239FF

Update your package database

sudo apt-get update

After that, you just need to run:

sudo apt-get install zentyal

And then point your browser to the Zentyal IP address and follow the instructions on screen:

https://<Server-ip-address>/

You will see Zentyal Dashboard after complete the wizard.

For me Zentyal is slow…

but good enough for manage the server / firewall.

” We can handle multiple server by hand, but we cannot handle it alone that’s why we have to install GUI interface for others people to take care of our server”

“People who know something that “click & click” not the black and white screen”

Debian/KFreebsd source.list

Debian/Kfreebsd Source list.

#############################################

deb http://security.debian.org/ squeeze/updates main
deb-src http://security.debian.org/ squeeze/updates main

deb http://ftp2.fr.debian.org/debian/ squeeze main contrib non-free

deb http://backports.debian.org/debian-backports squeeze-backports main contrib non-free

#############################################

Code to grep file

This is simple code to grep file …

This code using by other to grep squid configurations and other like apache.conf.

# cat /etc/squid/squid.conf | sed ‘/ *#/d; /^ *$/d’

(thanks to kotnik for small sed trick)

to safe file use this

# cat /etc/squid/squid.conf | sed ‘/ *#/d; /^ *$/d’ > /etc/squid/squid.conf-new

to view or search something in squid access.log use this command

# grep ‘string-to-search’ /var/log/squid/access.log

Simple trick but you can use it…

### http://www.cyberciti.biz/tips/linux-setup-transparent-proxy-squid-howto.html

Apache run under Multiple User

1. Install apache2-mpm-itk

aptitude install apache2-mpm-itk

2. After Create user

adduser WebAdmin

**force user to use apache group

usermod -g www-data WebAdmin

3. Add this line on vhost

<IfModule mpm_itk_module>

AssignUserId WebAdmin www-data

</IfModule>

4. Chown folder to user

chown WebAdmin:www-data /var/www/web/* -R

5. Reload apache

service apache2 reload

Exporting Mysql database results in garbage characters ’

mysql -u username -p –default-character-set=utf8 “database” < backup.sql