Pipe tar file to remote server w/ ssh

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/

Disabling service on startup in ubuntu

Need to install debian-helper-scripts.

root@pse07:/var/lib# service apparmor off
The program 'service' can be found in the following packages:
* debian-helper-scripts
* sysvconfig
Try: apt-get install <selected package>
bash: service: command not found
root@pse07:/var/lib# sudo apt-get install debian-helper-script
root@pse07:/var/lib# service apparmor stop
Unloading AppArmor profiles : done.

Changing data dir for mysql & dealing with Apparmor

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:Focus movie

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

Ownership problem with symbolic links

Howto setup and use a RAM Disk (tmpfs)

Under ubuntu there is a SHared Memory mount point already setup

jesterj@jesterj-laptop:~$ df -h | grep “/dev/shm”
none

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1006M 912K 1006M 1% /dev/shm

This is your ram disk!

Listing Ports and Active connections w/ Netstat

Who’s connected to my server?

root@donkey:~# netstat -ntla | grep "80"
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN
tcp        0      0 192.168.1.5:80          206.169.197.253:20277   ESTABLISHED

Grep port for host.

root@donkey:~# lsof -i tcp:80 | grep "20277"
apache2 20114 www-data    9u  IPv4 9576072       TCP donkey.local:www->206-169-197-253.static.twtelecom.net:20277 (ESTABLISHED)

Kill Connection

kill -9 20114

Managing Processes with job, fg, bg, screen.

Let’s talk about managing processes. If you want to run a script or scripts and then continue with other tasks while they run w/o using cron then you can use the ‘jobs’ command.

First, let create a script that will run indefinitely so we have time to work with our examples.

#!/usr/bin/python
x=0
while x == 1:
z=1

The above script will loop indefinitely since ‘x’ will never equal 1.

Next, run the script from the command line. Adding a & to the end of the script will send this jobs to the background.

jesterj@jesterj-laptop:~$ python loop.py &
[1] 4221

This sends loop.py to the background  with process id ‘4221’. You can view the process id stats by doing the following:

jesterj@jesterj-laptop:~$ ps -ef | grep ‘4221’
jesterj   4221  3083 99 16:37 pts/1    00:02:40 python loop.py

To view all jobs running in the background type ‘jobs’.

jesterj@jesterj-laptop:~$ jobs
[1]+  Running                 python loop.py &

To add another instance of the script to the background, repeat.

jesterj@jesterj-laptop:~$ python loop.py &
[2] 4333
jesterj@jesterj-laptop:~$ jobs
[1]-  Running                 python loop.py &
[2]+  Running                 python loop.py &

To quit the process use kill and the job number.

jesterj@jesterj-laptop:~$ kill %1
jesterj@jesterj-laptop:~$ jobs
[1]-  Terminated              python loop.py
[2]+  Running                 python loop.py &

To bring a process out of jobs to the foreground use, fg:

jesterj@jesterj-laptop:~$ fg %2
python loop.py

Vi Editing Basics

Basic Commands

:w  – write file

:wq – write and quit

:q! – exit, ignore changes

:set number – show line numbers

:set nonumber – turn off line numbers.


Text Mode

dd – Delete lines

2dd – delete 2 lines

p  – paste buffer lines

w – skip to mext word

a – append after cursor

i – insert at cursor

o – open new line after current line

r – replace character.

yy – yank current line

Searching

/string – search forward for string

?string – search back for string.

/tel[a-z] – search for ‘tel’ with last letter a-z

Find and Replace – ‘g’ stand for global, all lines in document.

:s/OLDWORD/NEWWORD/g

Search and replace,escaping slashes.

To replace the phrase /var/lib/mysql with /home/mysql you need to escape each ‘/’ with a ”. For example…

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

Regular Expressions

/Hello/ – search for word ‘Hello’ in line.

/^Hello$/ – search and matches if Hello is only word on line.

Recording Macros

qv – start record mode for macro ‘a’. second letter should be lower case character.

q – stop record

@v – to paste recorded text

9 @v – repeat v macro 9 times.
Save Settings

You can save persistent changes for vi by editing ~/.exrc

set number
….

Working with TAR and ZIP files in Python

>>>import os,tarfile

>>> tarfile=tarfile.open(‘/data/archive-1-1-1.tgz’,’r’)
>>> for x in tarfile:
…     print x

<TarInfo ‘./tmp/’ at 0xb7d9588c>
<TarInfo ‘./tmp/biteoff/’ at 0xb7d9558c>
<TarInfo ‘./tmp/biteoff/bite_offload.tgz’ at 0xb7d959cc>
<TarInfo ‘./tmp/biteoff/aesid.log’ at 0xb7d95a2c>
<TarInfo ‘./tmp/biteoff/lruid.xml’ at 0xb7d95a8c>
<TarInfo ‘./tmp/biteoff/BITEdump.sql’ at 0xb7d95aec>
<TarInfo ‘./tmp/biteoff/offload.cfg’ at 0xb7d95b4c>

ZIP

>>> import os, zipfile
>>> zipfile=zipfile.ZipFile(‘/home/jesterj/foo.zip’,’r’)
>>> for x in zipfile.namelist():
…     print x

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