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'

Tplink 1043nd disable scanning to get 300mbps

uci set wireless.radio0.noscan=1
uci commit
reboot

Wash machine need maintenance ? YES!

Wash machine need maintenance ? YES!

I buy the wash machine 3 years ago, last month I buy some chlorine bleach to clean it. The result is bad, I can't use the wash machine anymore because there is a lot small piece of dust leak out and attache on my cloths. 

So I decided to disassemble the wash machine to clean up the dust inside, below is some pictures.

Before cleaning

After clean up

So clean you wash machine today or buy a new one. :)

Network speed test with iPerf

If you have more than 1 wifi adapter, sometime you may curious which is perform better. Below is 1 of most common way to test your adapters.

What you need for test setup :

- 1 or more wifi adapter.
- 1 Linux/Unix machine.


1. Start terminal and run "sudo apt-get install iperf" on both machine.

2. Login to machine A, run "iperf -s -p 50000"
option "-s" : server mode.
option "-p" : listen to port 50000

3. On machine B, run "iperf -c [machine B IP] -p 50000
option "-c" : client mode.

4. Results

# iperf -s -p 50000
------------------------------------------------------------
Server listening on TCP port 50000
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.10.198 port 50000 connected with 192.168.10.134 port 42691
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.1 sec  48.5 MBytes  40.1 Mbits/sec
[  5] local 192.168.10.198 port 50000 connected with 192.168.10.134 port 42710
[  5]  0.0-10.1 sec  48.4 MBytes  40.1 Mbits/sec

From the both performance is similar, suspect bottleneck is on machine A, I re-test with another machine with LAN, below is the result.

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

Client connecting to 192.168.10.10, TCP port 50000

TCP window size: 22.9 KByte (default)

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

[  3] local 192.168.10.100 port 37808 connected with 192.168.10.10 port 50000

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0-10.0 sec  74.5 MBytes  62.3 Mbits/sec

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

Client connecting to 192.168.10.10, TCP port 50000

TCP window size: 22.9 KByte (default)

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

[  3] local 192.168.10.134 port 37344 connected with 192.168.10.10 port 50000

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0-10.0 sec  43.6 MBytes  36.5 Mbits/sec