Configure Time Zone for CentOS

$ yum install ntp -y

find out your timezone, as my case I used SGT. (/usr/share/zoneinfo/Asia/Singapore)
$ ll /usr/share/zoneinfo
$ chkconfig ntpd on
$ /etc/init.d/ntpd start

sync the time manually
$ ntpdate pool.ntp.org

Ubuntu Relaying Postfix SMTP (gmail)

The purpose is to sent mail through my Linux laptop with mailutils...

1. # apt-get install postfix

2. Edit /etc/postfix/main.cf by edit any exist entry as below values:

relayhost = [smtp.gmail.com]:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_tls_CAfile = /etc/postfix/cacert.pem
smtp_use_tls = yes

3. Saved your gmail authentication info to  /etc/postfix/sasl_passwd  as below:
[smtp.gmail.com]:587    user.name@gmail.com:password

4. Change permissions 
#sudo chmod 400 /etc/postfix/sasl_passwd
#sudo postmap /etc/postfix/sasl_passwd

5. Tell it where it can validate the certificate.
# cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | sudo tee -a /etc/postfix/cacert.pem

6. Restart & Test
#sudo service postfix restart
# echo 'test' | mail user.name@gmail.com

end.

[ref :https://help.ubuntu.com/community/Postfix]

SVN merge between trunk & branch

Branched out 'branch_xxx' for feature AA, after branch out 'trunk' is continue changes, now need all changes on 'trunk' merge to 'branch_xxx'.

1. Find out the version since branch_xxx copy.

    svn log -v --stop-on-copy

<comment>

------------------------------------------------------------------------

r503 | <user> | 2013-03-06 10:56:01 +0800 (Wed, 06 Mar 2013) | 1 line

2. svn merge -r 503:519  svn+ssh://user@svnurl/var/local/svn/proj/trunk

ver 519 is trunk latest ver, you might have some conflicts need to resolve.

3. svn ci -m "comment"

Enable flash player for Chromium on Ubuntu

    1  sudo apt-get install flashplugin-nonfree
    2  sudo cp /usr/lib/flashplugin-installer/libflashplayer.so /usr/lib/chromium-browser/plugins
    3  chromium-browser --enable-plugins

SSH to ESXi host with public key

cat ~/.ssh/id_rsa.pub | ssh root@esxi.local 'cat >> /etc/ssh/keys-root/authorized_keys'