#>/dev/diegor by Diego Russo is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
“easy_install” installs the latest version available of a python package. Sometime you need to use a specific version and you can install an earlier version of the package you need. For instance, if you need django 1.1.4, you’ll type:
#> easy_install "django==1.1.4"
Pretty simple eh?
Questions, doubts, comments are appreciated 
Telnet is an old utility used in local network to offer a bidirectional communication text-oriented using a terminal. Can be used also to make an http call to a remote server with the purpose of testing. Let’s see how:
#> telnet diegor.it 80
and you should have as output:
Trying 75.119.192.123... Connected to diegor.it. Escape character is '^]'.
GET / HTTP/1.1 host: diegor.it <line feed>
where “/” is the remote path. In this case we want the root. The output looks like this below:
HTTP/1.1 200 OK Date: Mon, 13 Jun 2011 09:06:43 GMT Server: Apache Cache-Control: no-cache, must-revalidate, max-age=0 Pragma: no-cache Expires: Wed, 11 Jan 1984 05:00:00 GMT Last-Modified: Sun, 12 Jun 2011 13:29:48 GMT Vary: Accept-Encoding Content-Length: 85589 Content-Type: text/html;charset=UTF-8 ...
Pretty simple! Any questions or comments are welcome.
Careful there, maybe that MaxOS X telnet is very smart, but usually the command is in the form “telnet hostname port”. So, ‘telnet http://www.diegor.it 80′ is a better way to do this, the protocol is specified by the port number.
I can’t get what are you saying. Where’s the “error”?
Ok, now i get it. The problem is that this fucking wordpress put “http://” as prefix in www addresses
Hahahaha OK, that’s a sound explaination. 
Besides, WP has put an http:// also in front of my comment’s telnet string ))
Yes, I saw that! fucking WP
A public web server could be reached by many http requests with no user agent. Apache can avoid this kind of requests. The configuration is very straightforward:
<Directory /path/to/a/directory> SetEnvIfNoCase User-Agent "^-?$" noUserAgent Order Allow,Deny Allow from All Deny from env=noUserAgent </Directory>
In this example Apache ignores all requests without user agent that are directed to /path/to/a/directory
Any comments are appreciate.
I used to manage a server based on linux and once I had this strange message:
#> ip_conntrack: table full, dropping packet
One of the effects of this message is that you aren’t able to make and receive new connections.
To solve that is enough increase ip_conntrack_max value. As first step check the current value typing:
#> cat /proc/sys/net/ipv4/ip_conntrack_max 65536
Now, increase this value typing:
#> echo 131072 > /proc/sys/net/ipv4/ip_conntrack_max
Generally the right value of ip_conntrack_max is set to the total MB of RAM multiplied by 16. If you have 8GB RAM (8192 MB), the value should be 131072.
If you know what cron is, you also know that the minimum time to execute a job is a minute. There is a small tip to execute a cron job every X seconds. For example if you need to run a cron job every 30 seconds (it’s a common case), you can do it adding these lines to crontab:
* * * * * root sh /path/to/myscript.sh * * * * * root sleep 30 && sh /path/to/myscript.sh
Both lines execute the job every minute, but the second one waits 30 seconds using “sleep” command from bash.
If you have any question, comment this post.
Anoni Mouse 11:09 am on April 25, 2012 Permalink |
loving python