Linux Admin Zone

For many users, running FTP Sever in Amazon EC2 instance is headache at the first time. You need to experiment before being able to transfer data. The main problems are Ingress firewall in Amazon environment and NAT traversal.

Here I’m using vsftp (vsfptd) Server, which is one of the most popular and easy to configure. The instance is running from base Fedora 4 AMI but the setup should be identical to other Red Hat based distros.

Install vsftpd FTP server, if not installed earlier:

$ yum install vsftpd

When installing perl Net::SFTP module in CentOS 5 box:

# perl -MCPAN -e 'install Net::SSH::Perl'

It got stuck at:

t/01-compile.t…..ok
t/02-buffer.t……ok
t/03-packet.t……1/10

then I tried installation with force so that it can skip tests if any of them failed:

# perl -MCPAN -e 'force install Net::SSH::Perl'

The module seems installed ok but while using in a script, error occured:
Can’t locate Net/SSH/Perl/Buffer.pm in @INC …

that means, the module still not installed/configured properly. To get it done, I searched for rpms and found rpmforge repository http://dag.wieers.com/rpm/packages/rpmforge-release/ have all the sufficient rpms:

You are running firefox and noticed that in a website there’s requirement of java runtime environment for proper viewing of site. Now firefox tries to install but in vain. Here are quick steps to install and configure java plugin for Firefox 3. These steps are tested in CentOS 5:

1. Download Java from here I have downloaded rpm in bin format.

2. Extract rpm from binary and then install it:

$ ./jre-6u5-linux-i586-rpm.bin
$ rpm -ivh jre-6u5-linux-i586.rpm

3. Make softlink to libjavaplugin_oji.so in your Mozilla Plugins directory after making sure that /root/.mozilla/plugins directory exists, else create the plugins directory first. Now as an example, if java is installed in /usr/java, this command will do the trick:

In mood to listen some music on my CentOS 5 system, I found that mplayer is not installed.
I’ve followed instructions from http://wiki.centos.org/TipsAndTricks/MultimediaOnCentOS
but stuck with error:

Error: Missing Dependency: libFLAC.so.4 is needed by package libsndfile

I have then forcebly removed following:

$ rpm -e --nodeps flac-1.1.2-27

and installed:

$ wget ftp://rpmfind.net/linux/dag/redhat/el3/en/i386/dag/RPMS/flac-1.1.0-4.rhel3.dag.i386.rpm
 $ rpm -ivh flac-1.1.0-4.rhel3.dag.i386.rpm

This resolved the error and system is now happily playing music.

You may also like to read:
* 5 steps to secure your Linux Server
* Ensuring secure access to production Linux Servers
* Bash script to backup essential log files in Linux
* Quickly change your ssh port from defualt 22 to something higher
* SSH port forwarding from remote to local machine
* Save root or user history to check later
* Install and configure denyhost to prevent brute force attacks

I got this error from subversion running as daemon while trying to checkout the repository:

$ svn co svn://192.168.0.1/nomanager --username svnadmin
Authentication realm: <svn://192.168.0.1:3690> Nomanager Repository
Password for 'svnadmin':
svn: Not authorized to open root of edit operation

To solve this issue, you need to update the svnserve.conf file of that repository:

$ vi /svn/nomanager/conf/svnserve.conf

Change the line non-access = read to anon-access = none and try again.

You may also like to read:
* 5 steps to secure your Linux Server
* Ensuring secure access to production Linux Servers
* Bash script to backup essential log files in Linux
* Quickly change your ssh port from defualt 22 to something higher
* SSH port forwarding from remote to local machine
* Save root or user history to check later
* Install and configure denyhost to prevent brute force attacks