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%matplotlib inline
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import mpl_plot_templates
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x = np.random.randn(10000)
y = np.random.randn(10000)
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import pylab as pl
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fig = pl.figure(1)
pl.subplot(1,2,1, rasterized=True)
pl.plot(x,y,'.')
pl.subplot(1,2,2)
rslt = mpl_plot_templates.adaptive_param_plot(x, y)
fig.savefig('rasterized.pdf')
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fig = pl.figure(1)
pl.subplot(1,2,1, rasterized=False)
pl.plot(x,y,'.')
pl.subplot(1,2,2)
rslt = mpl_plot_templates.adaptive_param_plot(x, y)
fig.savefig('not_rasterized.pdf')
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%%bash
# non-rasterized files are somewhat larger
ls -lh *raster*
open *raster*pdf
Cool tips courtesy Felix Stoehr:
1) It is possible to set chained alias, so that a one-step login can be done. Adding the following to the .ssh/config file on the laptop/at home
--------------------------------------------------------
# http://blogs.perl.org/users/smylers/2011/08/ssh-productivity-tips.html
ControlMaster auto
ControlPath /tmp/ssh_mux_%h_%p_%r
Host esosshgateway
HostName ssh.eso.org
User USERNAME
ForwardAgent yes
Host eso
HostName pc0XXXXX.ads.eso.org
ProxyCommand ssh esosshgateway -W %h:%p
User USERNAME
ForwardX11 yes
-------------------------------------------------
Where pc0XXXXXX is the name of the ESO desktop computer and USERNAME
one's username (e.g. fheissen).
That allows to do e.g.
scp thisfile.txt eso:
It however allows to do something even better:
2) It is possible to mount the ESO directory onto the laptop/home computer
A script called e.g. "esomount" containing
mkdir eso
sshfs eso: eso
echo "to unmount run esoumount"
mounts the directory to the "eso" subdirectory in the laptop's/home computers disk. File transfer between two computers can be done extemely easily without having to reenter the password all the time, or by copying in two steps.
A script called e.g. "esoumount" containing
fusermount -u eso; rmdir eso
then removes the mount point again.
This uses sshfs
Comment from Ruud: I installed 'sshfs' through macports, which also installs 'osxfuse', but not 'fusermount'. Trying to compile 'osxfuse' from the GitHub source led to missing library errors. These still weren't fixed half an hour later, so I went looking for alternatives. This seems to work fine for unmounting:
umount eso; rmdir eso
3) VPN is nice, but it might be that someone wants to access the actual stuff they have been working with on their desktop. That's where VNC comes in and also that can be done completely securely over ssh.
A) First start the vnc server over ssh
ssh -Y -t -L 5900:localhost:5900 USERNAME@ssh.eso.org "ssh -Y -t -L
5900:localhost:5900 USERNAME@pc0XXXXXX.ads.eso.org 'x11vnc -localhost -
display :0 -usepw' "
left # is local, right # is remote 5900 -> :0 5901 -> :1 etc.
B) Then on the local machine do
vncviewer -encodings "copyrect tight zrle hextile" localhost:0
Or on a Mac use e.g. "chicken of the vnc".
If the password file ~/.vnc/passwd does not yet exist, the first running
of x11vnc will ask for a password and write a hashed version of it to
that file.
The F8 key is very useful when running x11vnc.
These three tricks allow me at least to seamlessly work from the laptop or from home completely encrypted and safe on my ESO desktop. I find this extremely convenient and efficient. I like it much better than using screen.
I can start jobs on the processing cluster, work on documents etc, without having to sync the files all the time. If I need to sync the files, I can just mount the ESO home directory on the laptop and copy files in both directions.
Also:
https://code.google.com/p/pdsh/
pdsh -R ssh -w fstoehr@arcp[1-9] ls -al .bashrcHow can I check on the stats of all machines?
#!/usr/bin/sh
#
#
# Check CPU/RAM/Disk information.
# Version 1.5.2
for i in `cat server-list`
do
ssh eemselle@$i "echo '=======================';hostname;echo '=======================';echo 'CPU Information:';echo '-----------------';cat /proc/cpuinfo | grep 'model name'|sed 's/model name/CPU/g';echo '-----------------';echo 'Memory Information:';echo '-----------------';cat /proc/meminfo | grep 'MemTotal'|sed 's/MemTotal/RAM/g';echo '-----------------';echo 'Disk information:';echo '-----------------';df -h | grep scratch;echo '-----------------';echo 'OS information:';echo '-----------------';lsb_release -a | grep 'ID'|sed 's/Distributor ID://g';lsb_release -a | grep 'Release'|sed 's/Release://g'"
done
pdsh can make this easier
Use authorized keys to avoid entering your password multiple times.
If you don't have a file ~/.ssh/id_rsa.pub, make one using ssh-keygen. Then, copy the contents of ~/.ssh/id_rsa.pub and put them on a blank line in ~/.ssh/authorized_keys on any remote machine you want to ssh to. If there is no authorized_keys file, you can just make one with that path (~/.ssh/authorized_keys).
In principle, authorized_keys in a shared directory should allow you to ssh between machines that share the directory.
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