Anonymous12345's questions

I have a Linux server which I have installed Java on.

Sometimes, and only sometimes when a large number of visitors visit my website, the site hangs.

When I open the terminal and enter the "top" command to see whats going on, I can see that "Java" process is eating CPU! Like 400%.

I have also tried ps aux command, and can see that the command is from usr/bin/java

I have little experience in troubleshooting this kind of things, so I turn to you guys for help.

I have a java container installed (Jetty) which I must have in order to use SOLR (search engine) which is integrated into my website.

I can start and stop SOLR by:

  etc/init.d/solr stop

But this didn't remove the java process from the "Top" command. Still java was eating 400% CPU.

Is there other methods to restart java only?

This has happened twice to me, and each time I have now restarted my entire servers and everything is fine.

If you need more input let me know!

I use Postfix as a mailserver. I have Ubuntu OS.

Then I use PHP to send emails.

Problem is that none of my emails are encoded properly by a mailsoftware which my VPS provider uses.

According to them, the problem lies with me.

It is only the name field which isn't encoded properly. For example "Björn" becomes "Björn" in my emails.

However, when I echo the $name, it outputs "Björn" which is correct.

Also, gmail and hotmail does show it correctly.

The strange part is that the "text" (the message itself) is encoded properly.

I use the following for sending mail:

$headers="MIME-Version: 1.0"."\n";
$headers.="Content-type: text/plain; charset=UTF-8"."\n";
$headers.="From: $name <$email>"."\n";

$name=  iconv(mb_detect_encoding($name), "UTF-8//IGNORE//TRANSLIT", $name);
//// I HAVE TRIED WITH AND WITHOUT THE LINE ABOVE, NO DIFFERENCE            

mail($to, '=?UTF-8?B?'.base64_encode($subject).'?=', $text, $headers, '[email protected]'); 

I have tried with and without the iconv line also, no luck.

The last thing I can think of is POSTFIX, could there be a setting for character encoding there? Anybody knows?

I have nowhere else to ask, I just noticed that my server isn't responding, or it takes a lot of time. I have a classifieds website which uses mysql and php.

I use PUTTY and wrote top to see whats bothering the server. There is something EATING up CPU, and it is some java application. No idea what it is. Anybody know what I should do? Please guide me?

Have I been hacked?

EDIT: I just restarted the server from a control-panel my VPS provider offers, now the numbers are ok... What could it been?

Thanks

UPDATE.

I use SOLR, and that is the only Java because it uses Jetty as a container.

Could this be that a call was made and not cancelled and hence it caused a loop somehow. Anybody who used solr experienced this?

I get a whole bunch of these errors, but with different ad id:s in the end. The one below has ad id "Bmw_m3_brand_new_2939822"

[Fri Oct 29 22:57:37 2010] [error] [client 111.111.11.11] File does not exist: /var/www/annons, referer: http://www.domain.se/annons/Bmw_m3_brand_new_2939822

Everything works fine on the website. But I still get a whole lot of errors in the error.log file of apache2.

Anybody know anything about this?

I have a rewrite rule in my .htaccess FYI. And it is ok, without errors, I am sure. So I wonder, what is causing all these errors in the log file?

Thanks

EDIT:

The IPS of the clients in the errors seem to come from valid Internet Providers. Even my Own IP adress is located in the errors list, though I haven't received any 404 or errors when visiting the pages.

I have tried understanding SPF but the terms used are beyond my experience, so I turn to you guys now.

I have a Virtual private server (VPS) which I manage myself.

I have installed postfix on it, and have a server named:

  server1.domain.se

Now, the IP of my VPS is for example this:

   111.111.11.1

Then I have my DOMAIN registered at an ISP, where I can manually setup my own DNS Records.

I have these records setup (IP REPLACED WITH "111.111.11.1"):

NAME            TYPE     DATA
www.domain.se    A   111.111.11.1    
domain.se        A   111.111.11.1    
server1.domain.se A   111.111.11.1   
domain.se        TXT v=spf1 a mx ptr ~all

When I send email using php:s mail function the emails are considered spam by gmail, hotmail, and all other email-servers. Why is this?

Here is how I send the mail in php:

$mail_message= "THE MESSAGE GOES HERE";
$headers="MIME-Version: 1.0"."\n";
$headers.="Content-type: text/plain; charset=UTF-8"."\n";
$headers.="From: Domain <[email protected]>"."\n";
$subject="Subject goes here";

mail($email, '=?UTF-8?B?'.base64_encode($subject).'?=', $mail_message, $headers, '[email protected]'); 

Above, the email adress [email protected] doesn't even exist, just so you know.

I am as I said before very new to email servers, so please explain in detail how to solve this...

If you need more input, like my postfix configuration or something, just let me know.

Thanks

I have a linux server, with postfix just installed.

I am new to email-servers...

Anyways, I am able to send mail with php:s mail function, but they are considered "spam" by google mail (and probably most other email accounts also, haven't tested hotmail, yahoo etc).

I am guessing it has something to do with SPF, but I don't have a clue what SPF is, how to fix it etc etc...

Can anybody explain how to make my emails "Non-spam" which they are not?

OS is Ubuntu 9.10.

If you need more input let me know...

Thanks

PS: How can I disable all incoming mail to my postfix (email server) without using my firewall, maybe by using main.cf?

I have a linux server, where I just installed postfix.

I have done nothing more with the email server config.

My website is a classifieds website, where users may put ads, delete ads etc etc. No login and no member functions at all.

Only place I need to use email is this:

• When posting a new classified a confirmation email will be sent out
• When deleting a classified a confirmation email will be sent out
• When contacting the support
• users are able to email the seller by clicking "email seller" and filling out a form.

My Q is, how should I configure Postfix?

Do I need SASL, and TLS? What else do I need to know?

Btw, PHP is used to mail...

I have my own server (with root access).

I need statistics of users who visit my website etc etc...

I have looked at an app called Webalyzer... Is this a good choice?

I run apache2 on a Ubuntu 9 system...

If you know of any good statistics apps for servers please let me know.

And a follow-up question: All statistics are saved in log-files right? So how large would these log-files become then? Possibility to split them would be good, dont know if this is possible with Webalyzer though...

1- Wonder, is this a good setup of permissions in the /var directory?

drwxr-xr-x  2 root root  4096 2010-05-30 03:34 backups
drwxr-xr-x  7 root root  4096 2010-05-29 17:55 cache
drwxr-xr-x 29 root root  4096 2010-05-29 17:55 lib
drwxrwsr-x  2 root staff 4096 2009-07-14 04:36 local
drwxrwxrwt  3 root root    60 2010-06-02 03:34 lock
drwxr-xr-x  9 root root  4096 2010-06-02 03:34 log
drwxrwsr-x  2 root man   4096 2009-09-20 20:36 mail
drwxr-xr-x  2 root root  4096 2009-09-20 20:36 opt
drwxrwxrwt 12 root root   420 2010-06-02 12:12 run
drwxr-xr-x  4 root root  4096 2009-09-20 20:37 spool
drwxrwxrwt  2 root root  4096 2009-07-14 04:36 tmp
drwxr-xr-x 14 user root  4096 2010-05-30 22:21 www

2- Could you give me a brief explanation of the columns above? First one is which permissions they have. Second is a nr. Third and fourth says "root root" for example. fifth is another nr (4096 for example). and the others are obvious.

3- Could you give me a brief explanation of the folders above? Especially the "lock" and "tmp" folders. Lock contains an apache2 folder which seems empty.

Thanks

What does UID root and GID root mean?

Difference?

Please give me some examples...

Thanks

How can I on my ubuntu server, in Iptables only allow one IP adress on a specific port?

Thanks

I have solr setup with Jetty on my Ubuntu server.

On any computer now, I can type my_ip:8983/solr/ and the page will show upp to anybody.

How can I disable this so that only I can access that port and the solr admin?

Thanks

I have a Ubuntu Server.

From the terminal, how should I install JDK?

In this guide it says to use this command:

sudo apt-get install sun-java6-bin sun-java6-jre sun-java6-jdk

But on Suns website, it says JDK includes the JRE, so why the JRE in the line above?

Anybody know how to actually install Java?

Every guide and every forum shows different ways of doing it.

BTW: It is a VPS (virtual private server)

Whenever performing big tasks with lots of "text", the text gets cropped or something from above. I want to be able to read ALL that has happened.

Is this possible? because I can only read x nr of lines now.

Thanks

I have to install Solr on my Ubuntu Server. However, Solr wont work without Tomcat or another container, and also Java.

I have successfully installed tomcat6 and java.

BUT, in a tomcat6 guide online, it says I should configure iptables to allow connections via port 8080, which I have done. Then the guide says I can test the tomcat6 by going to:

  http://my_ip_adress:8080

But this makes the browser just load and wait somehow for a response, and finally display "website not available".

I have NO clue how to install Solr with Tomcat. Does anybody know how?

How do I know Tomcat6 works?

BTW: When I do this: /etc/init.d/tomcat6 start then it says OK.

If you need something let me know, I really need help with this one.

Thanks

UPDATE:

When executing this: sudo /etc/init.d/tomcat6 status it respons is Tomcat servlet engine is running with pid 28641

I have ubuntu 9.10 server.

Firstly, is OpenSSH the same as SSHD?

Secondly, In the terminal when typing whereis sshd i get this:

   whereis sshd
   /usr/sbin/sshd

Also when typing whereis openssh i get this:

  whereis openssh
 /usr/lib/openssh

How do I know if I have openssh?

Also, some tutorials online suggest opening sshd_config, so when typing this:

  whereis sshd_config
  /usr/share/man/man5/sshd_config.5.gz // I get this...

What should I do, because as you have answered my other Q about security, you have pointed out that it is the way you configure your ssh and etc which is important.

Is there any guide for this? How should I configure this?

I will be the only user for this server btw...

If you need more input let me know and I will update this Q.

Thanks

I have my VPS now, with ubuntu 9.10 OS.

I wonder about SSH.

What is it for, and how do I use it?

Also, in which order should I install apps on my server? (ex: PuTTY, IPTABLES, LAMP etc...)?

Thanks

I have ordered a VPS today, and I am still setting it up. I have some Q though: Also, I have just installed apache, php and mysql.

1- I don't understand which folder my website should be in. Is it the 'www' folder or the htdocs folder I should upload my site to? Because they are in entirely different directories.

2- How do I even upload files? FTP program? How do I install one, and which one?

Thanks

Do I need a firewall on my VPS which I ordered today?

If so, which one would you recommend?

I plan on running a classifieds website with Java, php, mysql. My OS is ubuntu 9.10

Thanks

Btw: What is iptables?

I am about to order a VPS (virtual private server) from a provider, and I guess I have to install some Servlet Container right?

I am about to use SOLR and my website is PHP MYSQL JAVASCRIPT based.

How does an installation of a servlet container work? .exe file?

I am VERY new to servlet containers, so please explain in detail...

Also, how do I know which servlet container I should use?

The VPS OS I will be using is Linux.

Thanks

PS: don't know if this belongs on ServerFault