change timezone in centos

yum -y install tzdata
cp /usr/share/zoneinfo/Asia/Tehran /etc/localtime

BIG thanks to: http://blog.connexeon.com/sysadmin/linux/change-timezone-on-centos/

mikrotik data connections with other types of interfaces

there are 2 interfaces that seem to work ethernet/ip and ip/ip both need for the two end points to have accessible valid ip addresses.
In case you use mikrotik to do PPPOE, you need to put the host OS nic in PROMISC=yes mode so that the PPPOE ack packets can be received by the gust OS.

linux enable NTSF mount in read/write mode

yum -y install dkms-fuse fuse fuse-ntfs-3g

httpd.conf and the Aliases

When the alias reads like below
Alias /cacti/ /var/www/cacti/

DirectoryIndex index.php
Options -Indexes
AllowOverride all
order deny,allow
deny from all
allow from 127.0.0.1
AddType application/x-httpd-php .php
php_flag magic_quotes_gpc on
php_flag track_vars on


to display the alias successfully in the browser do not forget the terminating slash at the end, so
http://localhost/cacti/ is right.

Persistent SSH SOCKS5 tunnel in Linux

ssh -c arcfour -o TCPKeepAlive=yes -N -f -D localhost:1080 user@remoteserver.com

instead of -c arcfour one can use -c blowfish-cbc as well. The performance of the tunnel gets better with a more lightweight cipher.

dbca logs

here you can find dbca logs $ORACLE_HOME/cfgtoollogs/dbca
thanks to OTN

Oracle dbca press finish nothing happens

If you press finish at the end of database creation of dbca and nothing happens, it is (in my case) an X problem. What I did was not to use the X server on windows instead I installed X11 on linux and used that one and it went smoothly.

check linux distribution

cat /etc/*-release

Linksys WAP54GS to act as router with dd-wrt

to make WAP54GS a router
1. Install dd-wrt
2. change the assignment of WAN port from vlan1 to vlan0
3. TADA!!!!!

/etc/sysconfig/desktop

/etc/sysconfig/desktop to choose the window manager permanently

vmware change MAC

in the virtual machine (config) vmx file:

# ethernet0.addressType = "generated"
# RANGE ALLOWED: 00:50:56:00:00:00-00:50:56:3F:FF:FF
ethernet0.addressType = "static"
# ethernet0.generatedAddress = "00:0c:29:94:43:71"
ethernet0.Address = "00:0c:29:94:43:70"

rsync without SSH

rsync -av rsync://server/rsync_share_name

slow sendmail startup

When sendmail is slow at startup do either of these things in /etc/hosts
127.0.0.1 localhost.localname machinename

or

192.168.1.100 machinename.domainname

if you have only machinename sendmail will be slow

firefox download flash

do a about:cache?device=disk and search for the URL or filename


many thanks to
http://labnol.blogspot.com/2005/11/save-flash-from-firefox-and-ie.html

MYSQL grant REMEBER 'user'@'server'

REMEMBER THIS:
grant all on DB1 to 'user'@'localhost' identified by 'password';

putty connect to session instead of server from command line

to make putty connect to session (based on the name of the session) instead of server from command line DO:

putty @SESSION_NAME

putty default font permanent

To change the default font in putty change the font settings in the Default Settings in the main window

linux upgrade problem

If you get something like "there are multiple partitions labelled /, they must be unique" simply use remove the label by:

tune2fs /dev/sda2 -L ''

# HOORAY

error reading information on service keytable: No such file or directory

if you get
error reading information on service keytable: No such file or directory
error: %trigger(kbd-1.08-10.2.i386) scriptlet failed, exit status 1

rpm -e kbd-1.08-10.2 --noscripts

Grub set default boot option just once

echo "savedefault --default=1 --once" | grub --batch
reboot