siliconpi's questions

I'm trying to understand how web services which have you setup CNAME records on your domain pointing to their servers work.

For example, following the instructions on LaunchRock (http://support.launchrock.com/knowledgebase/articles/36694-creating-your-cname-record-godaddy), I create a CNAME record as

signup.mysite.com 

with the value

sites.launchrock.com

I understand that folks accessing signup.mysite.com would be redirected to sites.launchrock.com, but I'm trying to understand how sites.launchrock.com is configured so that it detects this incoming request and tailors the webpage appropriately for my landing page.

What software / configuration is present there that handles this properly?

I looked at this How does bit.ly allow anyone to use cname.bit.ly as their CNAME? - but this did not explain how to serve different content to different domains.

I've got outdated requests coming into a custom port (2104) on my server.

http://www.server.com:portX

I've now setup my machine to handle those requests at:

http://subdomain.server.com:80

But how can I redirect old requests coming in like that? (through httpd magic)

I had mantis setup as www.example.com/mantis and now I've setup my httpd.conf to have it accessible at: mantis.example.com . Since I have many links referencing the earlier links, I need to redirect them to the new location.

This is what I have as my httpd.conf now:

<VirtualHost MYSERVERIP:80>
    ServerAlias EXAMPLE.com
    DocumentRoot /var/www/html/beta
    ServerName EXAMPLE.com
    UseCanonicalName On

 <IfModule mod_rewrite.c>
    RewriteEngine On

RewriteLogLevel 5
RewriteLog "/var/www/html/htaccess.log"

RewriteRule ^/mantis/(.*) http://mantis.EXAMPLE.com/$1 [L,R=301]

RewriteCond %{HTTP_HOST} !^www\.
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
...
 </IfModule>
</VirtualHost>

...

<VirtualHost MYSERVERIP:80>
    ServerAlias mantis.EXAMPLE.com
    DocumentRoot /var/www/html/mantis
    ServerName mantis.EXAMPLE.com
    UseCanonicalName On
</VirtualHost>

However, accessing http://www.EXAMPLE.com/mantis/view.php?id=17575 leads to:

http://guide.opendns.com/main?url=www.mantis.EXAMPLE.com%2Fview.php%3Fid%3D17575 

which shows:

You tried to visit www.mantis.EXAMPLE.com, which is not loading.

Note the www. part. I dont understand where its coming from!!

The htaccess logs are as follows:

MYCLIENTIP - - [27/May/2011:09:40:57 +0000] [EXAMPLE.com/sid#2b4fab862578][rid#2b4fabeec150/initial] (2) init rewrite engine with requested uri /mantis/view.php
MYCLIENTIP - - [27/May/2011:09:40:57 +0000] [EXAMPLE.com/sid#2b4fab862578][rid#2b4fabeec150/initial] (3) applying pattern '^/mantis/(.*)' to uri '/mantis/view.php'
MYCLIENTIP - - [27/May/2011:09:40:57 +0000] [EXAMPLE.com/sid#2b4fab862578][rid#2b4fabeec150/initial] (2) rewrite '/mantis/view.php' -> 'http://mantis.EXAMPLE.com/view.php'
MYCLIENTIP - - [27/May/2011:09:40:57 +0000] [EXAMPLE.com/sid#2b4fab862578][rid#2b4fabeec150/initial] (2) explicitly forcing redirect with http://mantis.EXAMPLE.com/view.php
MYCLIENTIP - - [27/May/2011:09:40:57 +0000] [EXAMPLE.com/sid#2b4fab862578][rid#2b4fabeec150/initial] (1) escaping http://mantis.EXAMPLE.com/view.php for redirect
MYCLIENTIP - - [27/May/2011:09:40:57 +0000] [EXAMPLE.com/sid#2b4fab862578][rid#2b4fabeec150/initial] (1) redirect to http://mantis.EXAMPLE.com/view.php?id=17575 [REDIRECT/301]

Related: httpd.conf changes to allow www.mysite.com and www.mysite.com/mantis and phpmyadmin?

Edit 1

After changing httpd.conf to:

RewriteLogLevel 5
RewriteLog "/var/www/html/htaccess.log"

RewriteCond %{HTTP_HOST} !^www\.
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

RewriteRule ^/mantis/(.*) http://mantis.EXAMPLE.com/$1 [L,R=301]

No luck still.

The log file is as:

MYCLIENTIP - - [27/May/2011:10:41:12 +0000] [EXAMPLE.com/sid#2b4fab856518][rid#2b4fabf06640/initial] (2) init rewrite engine with requested uri /mantis/view.php
MYCLIENTIP - - [27/May/2011:10:41:12 +0000] [EXAMPLE.com/sid#2b4fab856518][rid#2b4fabf06640/initial] (3) applying pattern '^' to uri '/mantis/view.php'
MYCLIENTIP - - [27/May/2011:10:41:12 +0000] [EXAMPLE.com/sid#2b4fab856518][rid#2b4fabf06640/initial] (4) RewriteCond: input='www.EXAMPLE.com' pattern='!^www\.' => not-matched
MYCLIENTIP - - [27/May/2011:10:41:12 +0000] [EXAMPLE.com/sid#2b4fab856518][rid#2b4fabf06640/initial] (3) applying pattern '^/mantis/(.*)' to uri '/mantis/view.php'
MYCLIENTIP - - [27/May/2011:10:41:12 +0000] [EXAMPLE.com/sid#2b4fab856518][rid#2b4fabf06640/initial] (2) rewrite '/mantis/view.php' -> 'http://mantis.EXAMPLE.com/view.php'
MYCLIENTIP - - [27/May/2011:10:41:12 +0000] [EXAMPLE.com/sid#2b4fab856518][rid#2b4fabf06640/initial] (2) explicitly forcing redirect with http://mantis.EXAMPLE.com/view.php
MYCLIENTIP - - [27/May/2011:10:41:12 +0000] [EXAMPLE.com/sid#2b4fab856518][rid#2b4fabf06640/initial] (1) escaping http://mantis.EXAMPLE.com/view.php for redirect
MYCLIENTIP - - [27/May/2011:10:41:12 +0000] [EXAMPLE.com/sid#2b4fab856518][rid#2b4fabf06640/initial] (1) redirect to http://mantis.EXAMPLE.com/view.php?id=17575 [REDIRECT/301]

I have the following lines in my /etc/logrotate.conf file which I'm not quite sure what they do:

(Edited in to show full file)

# see "man logrotate" for details
# rotate log files weekly
weekly

# keep 52 weeks worth of backlogs
rotate 52    # <-- added it by me

# create new (empty) log files after rotating old ones
create

# uncomment this if you want your log files compressed
#compress

# RPM packages drop log rotation information into this directory
include /etc/logrotate.d

# no packages own wtmp -- we'll rotate them here
/var/log/wtmp {
    monthly
    minsize 1M
    create 0664 root utmp
    rotate 1
}

# system-specific logs may be also be configured here.

I've got a php application which I use to place in:

~/public_html/beta/

And mantis and phpmyadmin in:

~/public_html/mantis/
~/public_html/phpmyadmin/

The application used to be accessed as:

www.mysite.com/beta/

And the others as:

www.mysite.com/mantis
www.mysite.com/phpmyadmin 

We've had to make certain changes in our application and need to shift the application from /beta/ to / (ie the document root).

I'm not comfortable with having mantis, phpmyadmin as subfolders in public_html - I'm afraid they may be accidentally deleted / tampered by me / other admins.

How can I setup my httpd.conf so that I can continue accessing my mantis and phpmyadmin as:

www.mysite.com/mantis
www.mysite.com/phpmyadmin 

as well as keep the "application" at:

www.mysite.com

?

My current httpd.conf reads as:

<VirtualHost IPADDRESS:80>
    ServerAlias MYSITE.com
    DocumentRoot /var/www/html
    ServerName MYSITE.com
    UseCanonicalName On

 <IfModule mod_rewrite.c>
    RewriteEngine On

RewriteCond %{HTTP_HOST} !^www\.
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
...

Question 1: WHat have people's experiences been with using Wowza Media Server 2 for Amazon EC2 (http://www.wowzamedia.com/ec2-streaming.html)

We're planning to use it to allow streaming experience for all of our stored videos (which are on S3).

Question 2: I'm specifically interested in knowing how many connections the EC2 instance can handle before balking...

I'll be setting up the flowplayer as follows on my server

<script type="text/javascript">
    flowplayer("player", "../flowplayer-3.2.4.swf",
        {
            clip: {
                url: 'mp4:amazons3/videos/thevideofile.mp4',
                provider: 'rtmp'
            },
            plugins: {
                rtmp: {
                url: '../flowplayer.rtmp-3.2.3.swf',
                netConnectionUrl: 'rtmp://999.999.999.99/vods3'
                }
                        }
        }
    );
</script>

where 999.999.999.99 will be the EC2 instance

Question 3: IF the EC2 instance (referenced via the rtmp://) is inaccessible, would the video be completely unplayable?

I've got other users on my linux system - how can I 'share' the system's error_log so its readable by other users on the system?

What do I need to do in order to set up something like OpenDNS, which other people can access? What software needs to run on this machine? Where do I populate my DNS entries from?

I'm just curious - no intention of running a competitor to their fine service.

I'm doing svn update to update the code for my php website, but it leaves .svn/ folders all over.

I think its dangerous to leave those files publically readable, but its very easy to update the system.

Is there a way to use svn update to update the system, but not to export the .svn/ folders?

How can I configure svnserve to run as a service.

svnserve -d -r /var/svn/

just works until the server is restarted.

Edit1: server details

root@vps [~]# uname -a
Linux vps.example.com 2.6.18-028stab070.14 #1 SMP Thu Nov 18 16:04:02 MSK 2010 x86_64 x86_64 x86_64 GNU/Linux

Possible Duplicate:
Setting up individually accessible public_html for each user of a linux machine

I have a dedicated server on which I have a site accessible as http://www.example.com

I need to create a user and allow him to access a page such as: http://user.example.com

What do I need to do so that he can access public_html from the internet as http://user.example.com? I want him to be able to execute php scripts as well (which I dont think should be a problem as the website on this site can do it already).

I don't have cPanel. I am running RHEL5/CentOS.

This is a 'duplicate' of Setting up individually accessible public_html for each user of a linux machine as I didn't get a response there.

I have a site located at /var/www/html/ which works fine.

I'm now trying to setup "blog.example.com" by adding the following entry in httpd.conf

Setup1

<VirtualHost *:80>
DocumentRoot /var/www/html/blog
ServerName blog.example.com

</VirtualHost>

BUT now the main site stops working and nothing is accessible at: http://blog.example.com either

root@server [~]# apachectl configtest
Syntax OK

I tried the following but it didnt work either

Setup2

NameVirtualHost *:80

<VirtualHost *:80>
ServerName blog.example.com
DocumentRoot /var/www/html/blog

</VirtualHost>

(This is linked to https://serverfault.com/questions/209945/setting-up-blog-at-blog-example-com-httpd-conf-issue)

The site is running as user 'apache' on a RedHat/CentOS system.

I tried the following as well with no luck

Setup3

NameVirtualHost *:80

<VirtualHost *:80>
DocumentRoot /var/www/html
ServerName www.example.com
</VirtualHost>

<VirtualHost *:80>
ServerName blog.example.com
DocumentRoot /var/www/html/blog
</VirtualHost>

This was better because I was able to access the site, but the blog.example.com link was still not functional.

Setup5

NameVirtualHost *:80

<VirtualHost *:80>
ServerName www.example.com
DocumentRoot /var/www/html
</VirtualHost>

<VirtualHost *:80>
ServerName blog.example.com
DocumentRoot /var/www/html/blog
<Directory /var/www/html/blog/>
        Options None
        AllowOverride None
        Order allow,deny
        Allow from all
</Directory>
</VirtualHost>

Setup6

NameVirtualHost *:80

<VirtualHost *:80>
ServerName www.example.com
DocumentRoot /var/www/html
</VirtualHost>

<VirtualHost *:80>
ServerName blog.example.com
DocumentRoot /var/www/html-blog
</VirtualHost>

In both cases, nslookup shows the following:

root@server [/etc/httpd/conf]# nslookup
> example.com
Server:         67.99.9.90
Address:        67.99.9.90#53

Non-authoritative answer:
Name:   example.com
Address: 174.999.99.99
> blog.example.com
Server:         67.99.9.90
Address:        67.99.9.90#53

** server can't find blog.example.com: NXDOMAIN

I'm examining a particular setup, and they have their crontab as follows:

 0 * * * * lynx http://www.example.com/cron/scriptA.php

Of course, this relies on the 'security-by-obscurity' precept, because any person on the internet, knowing where those files are located, can call them and potentially overload the server.

Besides that, is there anything inherently wrong with the above 'model' of running that script.

When I tested lynx http://www.example.com/cron/scriptA.php from the command prompt as root, it prompted me to download a session cookie, so I'm thinking I should atleast be modifying the above to:

lynx -accept_all_cookies http://www.example.com/cron/scriptA.php

Or should I be using:

wget -q -O /dev/nul http://www.example.com/cron/scriptA.php

I've got two Redhat5/CentOS systems which share a folder. I'm trying to change the shared folder location, but I ran into this error on the machine on which the folder is mounted...

How can I correct this? I rebooted the computer but to no avail.

Server1 - where its "mounted"

/etc/fstab
IPADDRESS2:/opt/programA/common/files    /srv/server2-share nfs rw,intr    0 0

Server2 - where its "shared"

/etc/exports
/opt/programA/common/files IPADDRESS1/28(rw,insecure,sync,no_root_squash)

Ran the following on Server2

root@server2 [~]# /etc/init.d/nfs start
root@server2 [~]# rpcinfo -p
   program vers proto   port
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    100011    1   udp    875  rquotad
    100011    2   udp    875  rquotad
    100011    1   tcp    875  rquotad
    100011    2   tcp    875  rquotad
    100005    1   udp    892  mountd
    100005    1   tcp    892  mountd
    100005    2   udp    892  mountd
    100005    2   tcp    892  mountd
    100005    3   udp    892  mountd
    100005    3   tcp    892  mountd
root@server2 [~]# /etc/init.d/nfs status
rpc.mountd (pid 10204) is running...
nfsd (pid 10201 10200 10199 10198 10197 10196 10195 10194) is running...
rpc.rquotad (pid 10189) is running...

My application needs to call 'convert' - http://linux.about.com/od/commands/l/blcmdl1_convert.htm

But its not present on my redhat system. How / what do I install?

I have a publicly accessible page which just has

<?php phpinfo(); >

I use it for debugging purposes while we're in beta, but is there any harm in leaving it accessible when its a live site?

Does this mean that selinux is currently enabled on my system?

In /etc/sysconfig/selinux, I set:

  SELINUX=disabled

AND then rebooted the server, but still in phpinfo() the same thing is showing up!

How do I disable it permanently?

(Nothing against selinux, but I have scripts that need to execute other programs - and it appears that selinux is interfering with them... What permissions are needed to run a system() command within a php script that writes to a folder?)

Edit 1:

If it helps, I also did the same in: /etc/selinux/config

How do I change the timezone on a RHEL5 system? I'm reading the instructions here - http://www.cyberciti.biz/faq/howto-linux-unix-change-setup-timezone-tz-variable/

But they seem very bold (altering the /etc/localtime file).

Is this an acceptable practice (steps from link below):

Generic procedure to change timezone
Change directory to /etc
# cd /etc
Create a symlink to file localtime:
# ln -sf /usr/share/zoneinfo/EST localtime

I have what appears to be weird and convoluted set of rules which work for me at the moment. Is there a way of "exporting" those and saving them to a file so that they can be restored later on in case things are messed up?

I have two servers. The program on the first needs to communicate with the second on port 2194.

I know its not working, because when I do:

root@server1 [~]# telnet myserver2.com 2194
Trying 123.123.123.98...
telnet: connect to address 123.123.123.98: Connection timed out
telnet: Unable to connect to remote host: Connection timed out

server1# iptables -L -n

Chain INPUT (policy DROP)
...
...

Chain FORWARD (policy DROP)
target     prot opt source               destination

Chain OUTPUT (policy DROP)
...

Chain LOCALINPUT (1 references)
target     prot opt source               destination
...

Chain LOCALOUTPUT (1 references)
target     prot opt source               destination
...

Chain LOGDROPIN (1 references)
target     prot opt source               destination
DROP       all  --  0.0.0.0/0            0.0.0.0/0

Chain LOGDROPOUT (1 references)
target     prot opt source               destination
DROP       all  --  0.0.0.0/0            0.0.0.0/0