Try replacing `apt-get` with `yum` as Amazon Linux based AMI uses the `yum` command instead of `apt-get`.

I guess you are actually using 	Amazon Linux AMI 2013.03.1 instead of Ubuntu Server 12.x reason why you don&#39;t have apt-get tool installed.

Check with &quot;uname -a&quot; and/or &quot;lsb_release -a&quot; to see which version of Linux you are actually running on your AWS instance. The default Amazon AMI image uses YUM for its package manager.

please, be sure your connected to a ubuntu server, I Had the same problem but I was connected to other distro, check the AMI value in your details instance, it should be something like

    AMI: ubuntu/images/ebs/ubuntu-precise-12.04-amd64-server-20130411.1 

hope it helps

Trying to install [Composer][1] dependency management tool on **Win7/64 + WampServer 2.2** via the [Setup Installer][2] and I am getting the following message:

&gt; The openssl extension is missing, which will reduce the security and stability of Composer.
If possible you should enable it or recompile php with --with-openssl  

So here is what I did...

 1. From my Wamp icon in Tray,  clicked `php &gt; php extensions &gt; php_openssl`
 2. This showed that task was completed by placing a **check mark** beside the extension
 3. I then restarted WampServer
 4. Then from the Wamp icon in tray, I clicked `php &gt; php.ini` and searched for openssl to verifiy it was NOT commented) out. It was not.
 5. I then went back to Composer-Setup.exe and tried again. **Same Warning Message**: &quot;openssl extension is missing&quot;
 6. Having **never** worked with OpenSSL, I&#39;m not sure what is supposed to be set, so I tried to browse to one of my local sites using https. It Failed.

What am I missing?

Please advise.

  [1]: http://getcomposer.org/
  [2]: http://getcomposer.org/download/

Composer Warning: openssl extension is missing. How to enable in WAMP

Consider the following regular expression, where `X` is *any* regex.

    X{n}|X{m}

This regex would test for `X` occurring *exactly* `n` or `m` times.

Is there a regex quantifier that can test for an occurrence `X` exactly `n` or `m` times?

Regex exactly n OR m times

I installed Ubuntu 12.04 on my instance and am trying to install packages using apt-get, but I am getting the following error:

    sudo: apt-get: command not found

How do I fix this?

How to fix apt-get: command not found on AWS EC2?

I installed Ubuntu 12.04 on my instance and am trying to install packages using apt-get, but I am getting the following error:
<pre><code class="hljs language-vbnet">sudo: apt-get: command not found
</code></pre>
How do I fix this?

Is there any difference between 

    pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;

**Or**

    pthread_mutex_t lock;
    pthread_mutex_init ( &amp;lock, NULL);

Am I safe enough if I use only the first method ?

**NOTE:** My question mostly refers to very small programs where at the most what I&#39;ll do is connect several clients to a server and resolve their inquiries with worker threads.

PTHREAD_MUTEX_INITIALIZER vs pthread_mutex_init ( &amp;mutex, param)

Is there any way to run a C++ program slower by changing any OS parameters in Linux? In this way I would like to simulate what will happen if that particular program happens to run on a real slower machine.

In other words, a faster machine should behave as a slower machine to that particular program.

Make a program run slowly

Under `/usr/share/applications` I created:

`intellij.desktop`:

    #!/usr/bin/env xdg-open
    [Desktop Entry]
    Version=1.0
    Type=Application
    Terminal=false
    Exec=/path/To/idea.sh&quot;
    Name[en_US]=Intellij
    Name=Intellij
    Icon=/path/to/intellij.png

Then I drag it to the Unity launcher bar. I click it, but nothing happens. How can I make it work?

`JAVA_HOME` is set correctly, other Java apps (like Eclipse) work and click `idea.sh`.


----------


My configuration:

- Ubuntu 12.10 64-bit (Desktop)
- Oracle JDK 1.7
- IntelliJ Community 12

Intellij launcher doesn&#39;t work on unity?

I am using django-celery for my django project. Last day I have changed my computer&#39;s hostname (I am using Ubuntu 12.04, edited file &#39;/etc/hostname&#39;), and after next restart django-celery was failing with error 

    Consumer: Connection Error: [Errno 111] Connection refused. Trying again in 4 seconds...

After some research on this error I could find that, changing my host name caused this error from [here][1]. My rabbitmq startup log shows

file: /var/log/rabbitmq/startup_log

    Activating RabbitMQ plugins ...

    ********************************************************************************
    ********************************************************************************

    0 plugins activated:

    ERROR: epmd error for host &quot;jinesh&quot;: nxdomain (non-existing domain)

My startup_err file is empty. 

when I run 

    root@jinesh:/home/jinesh# rabbitmqctl list_users
    Listing users ...
    Error: unable to connect to node rabbit@jinesh: nodedown

    DIAGNOSTICS
    ===========

    nodes in question: [rabbit@jinesh]

    hosts, their running nodes and ports:
    - unable to connect to epmd on jinesh: nxdomain

    current node details:
    - node name: rabbitmqctl4956@jinesh
    - home dir: /var/lib/rabbitmq
    - cookie hash: RGhmB2JR1LbZ57j7xWWTxg==


I hope changing the nodename may fix this issue. But I couldn&#39;t found a way to do this. Anyone have idea about how solve this issue?

**update**

while changing hostname you have to change both `/etc/hostname` and `/etc/hosts` files.

I reinstalled rabbitmq and solved this issue, Will answer this question.


[1]: https://bugs.launchpad.net/ubuntu/+source/rabbitmq-server/+bug/653405

rabbitmq-server fails to start after hostname has changed for first time

When I ask to see the current version of cc I get this.

    $ cc --version
    cc (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2
    Copyright (C) 2012 Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.  There is NO
    warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    
    $ 


What I would like to know is which of c89, c90, c99 or c11 is being used.

What is the default C -std standard version for the current GCC (especially on Ubuntu)?

I would like to know if there is a way to setup a cronjob/task to execute every minute. Currently any of my instances should be able to run this task.

This is what I have tried to do in the config files without success:

    container_commands:
      01cronjobs:
        command: echo &quot;*/1 * * * * root php /etc/httpd/myscript.php&quot;

I&#39;m not really sure if this is the correct way to do it

Any ideas?


AWS Elastic Beanstalk, running a cronjob

For some reason files in my S3 bucket are being forced as downloads instead of displaying in-line so if I copy an image link and paste it into address bar and then navigate to it, it will promote my browser to download it. Instead I actually have to click on open image to go to the url.

Any ways to change the way files are served from S3

AWS S3 display file inline instead of force download

I&#39;m uploading file to S3 using aws-sdk package:



    fs.readFile(sourceFile, function (err, data) {
        if (err) { throw err; }
    
        s3.client.putObject({
            Bucket: bucketName,
            Key: &#39;Folder/image.jpg&#39;,
            Body: data
        }, function (res) {
                console.log(&#39;Successfully uploaded file.&#39;);
            })
    
    });

I I need to make uploaded file to be downloadable via cloudfront, if I asume right, I need to set permissions on file: Everyone Open/Download, Folder2 should be made public (via menu Make Public). So 2 questions:

1) How to set\modify permissions on uploaded file\folder?

2) How make Folder public using AWS SDK for node.js.



AWS S3 node.js SDK uploaded file and folder permissions

I am creating an RDS instance using CloudFormation using this:

&lt;!-- language-all: lang-json --&gt;

&lt;pre&gt;
&quot;Resources&quot;: {
        &quot;myDB&quot;: {
            &quot;Type&quot;: &quot;AWS::RDS::DBInstance&quot;,
            &quot;Properties&quot;: {
                &quot;AllocatedStorage&quot;: &quot;5&quot;,
                &quot;DBInstanceClass&quot;: &quot;db.m1.small&quot;,
                &quot;Engine&quot;: &quot;MySQL&quot;,
                &quot;EngineVersion&quot;: &quot;5.5&quot;,
                &quot;DBName&quot;: &quot;mydb&quot;,
                &quot;MasterUsername&quot;: {
                    &quot;Ref&quot;: &quot;DBUser&quot;
                },
                &quot;MasterUserPassword&quot;: {
                    &quot;Ref&quot;: &quot;DBPassword&quot;
                },
                &quot;DBParameterGroupName&quot;: {
                    &quot;Ref&quot;: &quot;myRDSParamGroup&quot;
                }
            }
        }
&lt;/pre&gt;

and it all works.  But I need to run initial SQL on the DB when its created, to setup my apps schema.  My current approach is to have the app self migrating, but I&#39;d like to do it in the CloudFormation definition.  Is this possible?

Is there a way to run initial SQL when creating an RDS database instance using CloudFormation?

I need to create a web application using php mysql and html. The no.of requests and data will be very high. I need Amazon server space.

I read the Amazon documentation and found that S3 is a storage that provides a simple web services interface. EC2 is a web service that provides resizable compute capacity in the cloud. 

Can I purchase S3 and run php and query my database? 

Please tell me the difference between Amazon S3 and Amazon Ec2 instance.

What is the difference between Amazon S3 and Amazon EC2 instance?

I am trying to publish my site on an Amazon&#39;s EC2 Instance, and I keep getting a 500 error. I really don&#39;t know why.

//Log Files

        [Sun Feb 17 23:12:48.066802 2013] mod_wsgi (pid=2102): Target WSGI script &#39;/srv/www/app/poka/apache/wsgi.py&#39; cannot be loaded as Python module.
        [Sun Feb 17 23:12:48.066840 2013] mod_wsgi (pid=2102): Exception occurred processing WSGI script &#39;/srv/www/app/poka/apache/wsgi.py&#39;.
        [Sun Feb 17 23:12:48.066864 2013] Traceback (most recent call last):
        [Sun Feb 17 23:12:48.066889 2013] File &quot;/srv/www/mysite/poka/apache/wsgi.py&quot;, line 26, in &lt;module&gt;
        [Sun Feb 17 23:12:48.066920 2013] from django.core.wsgi import get_wsgi_application
        [Sun Feb 17 23:12:48.066945 2013] ImportError: No module named django.core.wsgi

//Apache Config Files
        

        WSGIScriptAlias / /srv/www/app/mysite/apache/wsgi.py

        WSGIDaemonProcess mysite python-path=/srv/www/app/mysite:/home/ec2-user/.virtualenvs/mysite-main/lib/python2.7/site-packages
        WSGIProcessGroup mysite

        &lt;Directory /srv/www/app/mysite/apache/&gt;
        &lt;Files wsgi.py&gt;
        Order deny,allow
        Allow from all
        &lt;/Files&gt;
        &lt;/Directory&gt;

        &lt;Directory /srv/www/app/mysite/apache/&gt;
        Order deny,allow
        Allow from all
        &lt;/Directory&gt;

        &lt;Directory /home/ec2-user/app/mysite/static&gt;
        Order deny,allow
        Allow from all
        &lt;/Directory&gt;

        &lt;Directory /home/ec2-user/app/mysite/media&gt;
        Order deny,allow
        Allow from all
        &lt;/Directory&gt;

//wsgi.py

        import os
        import sys
        import site

        site.addsitedir(&#39;/home/ec2-user/.virtualenvs/mysite-main/lib/python2.7/site-packages&#39;)
        os.environ.setdefault(&quot;DJANGO_SETTINGS_MODULE&quot;, &quot;mysite.settings&quot;)

        from django.core.wsgi import get_wsgi_application
        application = get_wsgi_application()

        path = &#39;/srv/www/app/mysite&#39;

        if path not in sys.path:
            sys.path.append(path)


ImportError: No module named django.core.wsgi Apache + VirtualEnv + AWS + WSGI

I&#39;m using a EC2 server instance. Used the following to install Jenkins:

    wget -q -O - http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add -
    sudo sh -c &#39;echo deb http://pkg.jenkins-ci.org/debian binary/ &gt; /etc/apt/sources.list.d/jenkins.list&#39;
    sudo apt-get update
    sudo apt-get install jenkins

but I need to install software on the Jenkins server so in my EC2 instance I did 

    sudo –s –H –u jenkins

to get into the jenkins server.
Then I tried to do

    sudo cabal install quickcheck
but it prompted me for jenkins password.
I&#39;ve been searching around the internet for 4hrs now and nothing is helping me get administrative privilege in the jenkins server.

So I&#39;m building my project using the following command in shell:

    sudo cabal clean
    sudo cabal configure
    sudo cabal build
    sudo cabal install
This is the error I&#39;m getting:

   

     Started by timer
    Building in workspace /var/lib/jenkins/jobs/Finance/workspace
    Checkout:workspace / /var/lib/jenkins/jobs/Finance/workspace - hudson.remoting.LocalChannel@eea6dc
    Using strategy: Default
    Last Built Revision: Revision b638e2182dece0ef1a40232b1d75fa3ae5c01a5d (origin/master)
    Fetching changes from 1 remote Git repository
    Fetching upstream changes from origin
    Commencing build of Revision b638e2182dece0ef1a40232b1d75fa3ae5c01a5d (origin/master)
    Checking out Revision b638e2182dece0ef1a40232b1d75fa3ae5c01a5d (origin/master)
    [workspace] $ /bin/sh -xe /tmp/hudson3500373817395137440.sh
    + sudo cabal clean
    sudo: no tty present and no askpass program specified
    Sorry, try again.
    sudo: no tty present and no askpass program specified
    Sorry, try again.
    sudo: no tty present and no askpass program specified
    Sorry, try again.
    sudo: 3 incorrect password attempts
    Build step &#39;Execute shell&#39; marked build as failure
    Sending e-mails to: ***@gmail.com
    ERROR: Could not connect to SMTP host: localhost, port: 25
    javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
      nested exception is:
    	java.net.ConnectException: Connection refused
    	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
    	at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
    	at javax.mail.Service.connect(Service.java:295)
    	at javax.mail.Service.connect(Service.java:176)
    	at javax.mail.Service.connect(Service.java:125)
    	at javax.mail.Transport.send0(Transport.java:194)
    	at javax.mail.Transport.send(Transport.java:124)
    	at hudson.tasks.MailSender.execute(MailSender.java:116)
    	at hudson.tasks.Mailer.perform(Mailer.java:117)
    	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
    	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:814)
    	at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:786)
    	at hudson.model.Build$BuildExecution.post2(Build.java:183)
    	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:733)
    	at hudson.model.Run.execute(Run.java:1592)
    	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
    	at hudson.model.ResourceController.execute(ResourceController.java:88)
    	at hudson.model.Executor.run(Executor.java:237)
    Caused by: java.net.ConnectException: Connection refused
    	at java.net.PlainSocketImpl.socketConnect(Native Method)
    	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
    	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
    	at java.net.Socket.connect(Socket.java:579)
    	at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:286)
    	at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
    	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
    	... 17 more
    Finished: FAILURE

What is the default Jenkins password?

I have a template that works and generates a stack but I cannot find a property to set or something else that allows me to give a Name to the EC2 Instance I have created. When it is generated the Name is blank.

Name an EC2 Instance in the CloudFormation template?

I have an EC2 instance running and I am able to SSH into it. 

However, when I try to rsync, it gives me the error Permission denied (publickey). 

The command I&#39;m using is: 

    rsync -avL --progress -e ssh -i ~/mykeypair.pem ~/Sites/my_site/* root@ec2-XX-XXX-XXX-XXX.us-west-2.compute.amazonaws.com:/var/www/html/

I also tried

    rsync -avz ~/Sites/mysite/* -e &quot;ssh -i ~/.ssh/id_rsa.pub&quot; root@ec2-XX-XXX-XXX-XXX.us-west-2.compute.amazonaws.com:/var/www/html/



Thanks,


Rsync to Amazon Ec2 Instance

While creating a new AWS EC2 instance using the EC2 command line API, I passed some user data to the new instance.

How can I know whether that user data executed or not?



Content Type	Original Author	Original Content on Stackoverflow
Question	Pat841	View Question on Stackoverflow
Solution 1 - Ubuntu	Engin Yapici	View Answer on Stackoverflow
Solution 2 - Ubuntu	marius_neo	View Answer on Stackoverflow
Solution 3 - Ubuntu	hexnet	View Answer on Stackoverflow
Solution 4 - Ubuntu	Cristhian Recalde	View Answer on Stackoverflow

How to fix apt-get: command not found on AWS EC2?

Ubuntu Problem Overview

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Solution 1 - Ubuntu

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Regex exactly n OR m times

Composer Warning: openssl extension is missing. How to enable in WAMP

Attributions