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I have created two virtual machines having ubuntu 12.04 lts os. Installed apache tomcat 7 on both VM's (virtual machine). configured virtual private network.
HTTP request on VM1 should run a shell script on VM2 and return the result to VM1 as an html file. I did the configuration part.
Now i need to know, how to write an HTML response file in VM2 server(which can be displayed on VM1 browser as a response) which will invoke a shell script having "ps -Aef" command to list all processes running on VM2. i need to display the contents of this file on VM1.
since i am a beginner in web programming/shell scripting please help me.
Thank you in advance
-Akshay
You can use PHP
Install php (apt-get install php)
copy index.php file into /var/www/html folder
index.php
<?php
$output = shell_exec('ps -Aef');
echo "<pre>$output</pre>";
?>
browse http://<ip-address>/index.php
What you need is a web server that can run CGI scripts. It's too long to completely list the steps of setting up CGI (and it depends on your web server of choice etc.). But considering you are a beginner, there is a pretty extensive tutorial with examples on how to configure Apache to run CGI scripts right here.
To summarize:
You need to install Apache (apt-get install apache2)
Configure Apache to enable mod_cgi as described in the tutorial above.
Write your first CGI program and test it (also in that tutorial).
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A debian package I made overwrote files belonging to other packages (using --force-overwrite option). I realized this was bad, but after deleting these files from the package, building and reinstalling, it'll delete those files since it think's my package owns those files and no longer needs them.
I need dpkg to forget my package ever knew about those files, such that I can remove/purge/install and without it ever thinking about those files again.
Note that this package is only meant to be deployed on systems I control, not distributed to clients, so tinkering with already installed packages is acceptable, so long as I can get this back to a non-messed up state.
Couldn't find an answer on stackoverflow or here, appreciate any help or links to similar questions I missed.
Found that dpkg stores a list of each installed package's files here:
/var/lib/dpkg/info/mydpkg.list
Appears to be a list of every directory and file installed by the package, eg
/etc/udev
/etc/udev/rules.d
/etc/udev/rules.d/95-serial485-pi3.rules
/etc/udev/rules.d/97-serial485-pi4.rules
Fix: sudo vim /var/lib/dpkg/info/mydpkg.list and delete lines of files I want my package to forget about, therefore not trying to delete when uninstalling (or when installing a new version of the package that doesn't have those files anymore.) Unclear on if it's necessary to delete the lines referencing parent directories (eg /etc/udev and /etc/udev/rules.d above).
Bonus: I found this by using strace on the command that lists these files, finding out where it gets its info from:
strace dpkg-query -L mydpkg
Taken from here:
https://unix.stackexchange.com/questions/200171/where-does-dpkg-l-gather-its-information
We can use some commands that help us to keep the package dependency and remove the package.
Remove the package without removing the dependency.
sudo dpkg -r --force-depends <package_name>
Remove the package including the configuration file and without removing the dependency.
sudo dpkg -P --force-depends <package_name>
I highly don't recommend this thing because sometimes dependency may create an issue in the future.
I always prefer to uninstall all the dependency when I uninstall the package.
If your package is broken then you can use the following command to resolve an issue.
To fix the broken packages
sudo apt install -f
I have answered this question based on this article.
a rudimentary question, but please let me know.
I want to run the following program which will process and return the result by json when accessed by GET or POST.
FileManagerController.cs
For example, in PHP you just need to place it in the htdocs folder of Apache.
I would like to do the same thing with dot net core mvc.
but I don't know what kind of words to search.
Also, in the near future we would like ruby to work the same way in another project.(In a way that doesn't use a framework such as rails)
So, please tell me how to find out how to run various languages alone on a web server.
You need to make a "project" (file type .csproj) that you can build and run on your machine. Check out the Getting Started with ASP.NET page for instructions to install the SDK and create a new project and run it.
To run your code file above, you can:
$ dotnet new mvc
Copy the above FileManagerController.cs file into the generated Controllers folder.
$ dotnet run
Your app will be running on http://localhost:5000, you can hit your web site using the url /FileManager.
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Am learning ruby scripting language. I was implementing exercises in ruby.
In that I had a one problem. I need to display the ruby output in browser.
For example, I have a one ruby script, named hello.rb. It will print the "Hello world message". Normally if we execute this with ruby interpreter it will print that in the terminal. I need to print that hello world message in the browser by invoking the ruby script.
For that I was referred in the internet. In that they told that you need to install gem 'tilt'.
Without installing any gems how can we achieve this ?
Thanks in Advance!
Ruby comes with a simple web server, webrick. The following code uses webrick to implement a simple "hello, world" web server:'
require "webrick"
server = WEBrick::HTTPServer.new(Port: 8000)
server.mount_proc "/" do |req, res|
res.body = "Hello, world!\n"
end
server.start
When run, it prints some log output to show that it is running and ready to serve requests:
[2016-07-22 12:02:01] INFO WEBrick 1.3.1
[2016-07-22 12:02:01] INFO ruby 2.3.1 (2016-04-26) [x86_64-linux]
[2016-07-22 12:02:01] INFO WEBrick::HTTPServer#start: pid=16318 port=8000
I used the *nix utility curl to give the server a request:
wayne#treebeard:~$ curl localhost:8000
Hello, world!
Although I used curl, any web browser would also work. After starting the program, send your web browser to:
http://localhost:8000
I have my HTML pages locally stored on my Mac. I already bought the domain and the hosting service. There's a way with which I can test these local webpages so that I can see how they render on different devices? I have heard about local server for testing or using devices via USB attached to the PC. Is there not a more standard and unified way to testing them? It can be everything (software, online services, ...) I'm not interested in emulators/simulators.
If you have only html and/or Javascript code:
Open it with your browser, it will be enough
If you have PHP code:
Install a local web-server (Ex: Apache)
If you have MySQL code:
Install a MySQL server
Usually, installing Mamp (or an equivalent for Android/iOS) is enough to do every basic things. It will provide you SQL and PHP server
Hope it helped you
Creating a local server: Node.js and BrowserSync
I've found a very simple way to test webpages (in my case, HTML5 pages) that are saved in PCs memory so that we could test them directly into all the different devices available, without using simulators/emulators.
The solution is creating a local server using two great totally free tools: Node.js and BrowserSync. Before writing this answer, I tried this solution on my own, and I was completely satisfied of the result! You can find the source for this answer at JavaScript Kit.
Here you are the main steps:
Install Node.js (verify if Node.js is correctly installed with the node- v command from the terminal);
Install BrowserSync using npm install -g browser-sync directly from the terminal. Be careful you need root permissions (I simply used sudo npm install -g browser-sync);
Run BrowserSync:
Navigate to your target directory (the one which contain the static files used to create the website, that's the HTML (and CSS) files) using the command line (to make an example, it could be cd folderA/folderB);
Create a local server inside that directory, with browser-sync start --server.
These are the main steps, but you can directly read the solution from the original source I linked some lines before.
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I installed and tried to use jasper report studio. The first brick wall you hit when you try to create a datasource for your reports is
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
The forums say I need to install a jar on the classpath. I have no idea how to do this, so the first hurdle is how to get the jar. The only place I can find is this:
http://dev.mysql.com/downloads/connector/j/
but this unfortunately gives you an msi installer, not a jar. I don't want to install stuff, just get the jar.
I have mysql DB installed, had have trawled through the install dir in program files, but can't find the jar.
Anyone know the official (not malware site) way to get hold of the mysql jar? It seems bizarre that its so hard to find.
I have windows 8 64 bit and mysql 5.6.
Go to http://dev.mysql.com/downloads/connector/j and with in the dropdown select "Platform Independent" then it will show you the options to download tar.gz file or zip file.
Download zip file and extract it, with in that you will find mysql-connector-XXX.jar file
If you are using maven then you can add the dependency from the link http://mvnrepository.com/artifact/mysql/mysql-connector-java
Select the version you want to use and add the dependency in your pom.xml file
If you have WL server installed, pick it up from under
\Oracle\Middleware\wlserver_10.3\server\lib\mysql-connector-java-commercial-5.1.17-bin.jar
Otherwise, download it from:
http://www.java2s.com/Code/JarDownload/mysql/mysql-connector-java-5.1.17-bin.jar.zip
Here's a one-liner using Maven:
mvn dependency:get -Dartifact=mysql:mysql-connector-java:5.1.38
Then, with default settings, it's available in:
$HOME/.m2/repository/mysql/mysql-connector-java/5.1.38/mysql-connector-java-5.1.38.jar
Just replace the version number if you need a different one.