OSS Robot

jesterj@jesterj-laptop:~$ tar zcvf - donkey* | ssh jesterj@donkey.dnsdojo.com “cat > ~/testarchive3.tar”By far the easiest way to tar a file and send it to a remote location is to simply have two commands on one line. The first to create the tar file, the other to scp the command. In this example, I am not prompted for a passphrase since i have my ssh key saved on the remote server for this user.

Easy:

jesterj@jesterj-laptop:~$ tar -cvf testarchive.tar donkey*; scp testarchive.tar jesterj@remoteserver:~
donkey
donkey1.zip
donkey2.txt
donkey2.zip
donkey.tar
donkey.txt
testarchive.tar                               100%   20KB  20.0KB/s   00:00
jesterj@jesterj-laptop:~$

Pipe the file…More complicated:

jesterj@jesterj-laptop:~$ tar zcvf - donkey* | ssh jesterj@donkey.dnsdojo.com "cat > ~/testarchive3.tar"

source: http://www.cyberciti.biz/faq/howto-use-tar-command-through-network-over-ssh-session/

Linux, Networking

In ubuntu there is program called apparmor that verifies certain programs are configured appropriately, mysql included. Just recently the partition that holds all the data (/var/lib/mysql) filed up. Since I was at 100% and this is a production box I needed to fix this quickly. My options were as follows:

1. Setup a sym link from /var/lib/mysql to /home/mysql, move data here OR
2. Simply create a new dir call /home/mysql, move data here

To do this edit /etc/mysql/my.cnf
...
datadir =/home/mysql
#datadir = /var/lib/mysql
...

Save the file and restart mysql and you will get the following error:

root@slave:/etc/mysql# /etc/init.d/mysql2 start
* Starting MySQL database server mysqld [fail]

The problem here is that apparmor is dissallowing mysql from running in any other location than /var/lib/mysql. You will need to edit the apparmor file for mysql.

root@slave:/etc/apparmor.d# grep "/var/lib/mysql" usr.sbin.mysqld
/var/lib/mysql/ r,
/var/lib/mysql/** rwk,


To correct this problem replace all instances of /var/lib/mysql with /home/mysql. Open the file with file and do a search and replace. See that I am escaping the slashes!

:%s /\/var\/lib\/mysql/\/home\/mysql/

Reload appamor and mysql should start up with the new config in your my.cnf file!

root@slave:/etc/apparmor.d# /etc/init.d/apparmor restart
Reloading AppArmor profiles : done.
root@slave:/etc/apparmor.d# /etc/init.d/mysql2 start
* Starting MySQL database server mysqld

Networking, Uncategorized

sudo tcpdump -n -i eth0 -s 0 -w output.txt src or dst port 80

Networking, Uncategorized

Using urllib…

#!/usr/bin/python
import urllib
c=urllib.urlopen('http://nike.com')
print c.getcode()

200

or try with httplib…

#!/usr/bin/python
import httplib
conn = httplib.HTTPConnection("www.python.org")
conn.request("GET", "/index.html")
r1 = conn.getresponse()
print r1.status

200

Networking, Uncategorized

Install iperf

apt-get install iperf

Listen on machine #1

$ iperf -s -P 2 -i 5 -p 5999 -f M

Send packets on machine #2

iperf -c backupserv -P 1 -i 5 -p 5999 -f M -t 60 -T 1

Results:
————————————————————
Client connecting to backupserv, TCP port 5999
TCP window size: 0.02 MByte (default)
————————————————————
[  3] local 192.168.1.5 port 49711 connected with 192.168.1.3 port 5999
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 5.0 sec    562 MBytes    112 MBytes/sec
[  3]  5.0-10.0 sec    562 MBytes    112 MBytes/sec
[  3] 10.0-15.0 sec    561 MBytes    112 MBytes/sec
[  3] 15.0-20.0 sec    561 MBytes    112 MBytes/sec
[  3] 20.0-25.0 sec    562 MBytes    112 MBytes/sec
[  3] 25.0-30.0 sec    561 MBytes    112 MBytes/sec
[  3] 30.0-35.0 sec    561 MBytes    112 MBytes/sec
[  3] 35.0-40.0 sec    561 MBytes    112 MBytes/sec
[  3] 40.0-45.0 sec    561 MBytes    112 MBytes/sec
[  3] 45.0-50.0 sec    561 MBytes    112 MBytes/sec
^C[  3]  0.0-50.8 sec  5707 MBytes    112 MBytes/sec

Linux, Networking, Uncategorized Networking

Problem: I have an airport express in my basement but my xbox is located upstairs. I want to avoid running wire upstairs as well as purchasing the $80 wireless adapter for the xbox. Since i have a spare airport express i want to set this up in brigding mode. It does work but there are quite a few steps. See below:

How to configure airport xpress with Xbox

1. Setup main base station to work correctly
2. Set channel to ‘1′ or the same on both.
3. Get the airport id from each wireless unit (not the WAN id) - you will need this later.
4. On the airport for the xbox make sure you have these settings;
5. Wireless Mode: Create Wiresless Network (home router)
6. Connect using: Airport (WDS)
7. Mac Address: (enter the mac for the main base station)
8. Configure: Using DHCP
9. Under WDS Table
10. enable this base sataion as ‘remote base stations’
11. Enter airport ID for main base station.
12. On the main base station go to the WDS tab
13. enable as main base station
14. add mac address of xbox airport express

Update both and restart!

Networking, Uncategorized