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When stress testing our loadbalancer, i was unable to get more than 20 reliable ssh connections. The following error would be reported.

ssh_exchange_identification: Connection closed by remote host

The resolution for this is quite simple.

Edit the /etc/ssh/sshd_config file and increase the MaxStartups. On my server i set this to 200.

Edit /etc/sysctrl.conf and add the following line:

net.core.netdev_max_backlog = 3000

Then apply this change:

# sysctl -p

 

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sernet.de maintain the latest Samba releases in a yum repository, allowing for an easy and painless install or upgrade of Samba on your yum based Linux distribution.

To install the latest available Samba execute the following commands at the shell:

# cd /etc/yum.repos.d
# wget http://ftp.sernet.de/pub/samba/experimental/centos/5/sernet-samba.repo
# yum install samba

To upgrade an existing Samba install:

# cd /etc/yum.repos.d
# wget http://ftp.sernet.de/pub/samba/experimental/centos/5/sernet-samba.repo
## Note: edit sernet-samba.repo and add the line "gpgcheck=false" otherwise 
## it will not install as it is not signed
# yum update samba

Note: These steps will install the very latest build available at sernet.de.
If you require a less bleeding edge version of Samba, use the "tested" repo. This can be found at the following URL: http://ftp.sernet.de/pub/samba/tested/rhel/5

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In Adobe's own words:

"Adobe® AIR® is a cross-operating system runtime that lets developers combine HTML, Ajax, Adobe Flash®, and Adobe Flex® technologies to deploy rich Internet applications (RIAs) on the desktop."

The outcome of this combination of technologies is that developers can design and render quite beautiful user interfaces cross platform. For us desktop Linux users it is nice to have an additional avenue for obtaining and running attractive desktop applications.

Examples of great Adobe air applications are Adobe.com for My Desktop, TweetDeck and the Times Reader. You can download these applications and many more at the Adobe Marketplace.

The easiest way to install Adobe Air on Fedora 12 is to download the latest build from Adobe, click here.

Once you have downloaded the .bin file do the following at the shell:
su -
chmod +x AdobeAIRInstaller.bin
./AdobeAIRInstaller.bin
Once you have Air installed, there is a slight tweak you will have to do to get it running on Fedora 12, it is related to the security certificates. This can be remedied in one simple line at the shell prompt as root.
su -
for c in /etc/opt/Adobe/certificates/crypt/*.0; do aucm -n $(basename $c) -t true; done
What this line is doing is using the aucm which is the Adobe Unix certificate manager to set the certificates installed as trusted.
You will now be able to go to the Adobe Marketplace and download and run Air applications without any issues.

Enjoy!

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System Requirements:
  • Minimum memory: 4MB
  • Minimum Diskspace: ~20MB
The Recital Runtime System (RTS) executes the object code generated by the Recital compiler. Object files are read from disk and loaded dynamically into shared memory segments. The advantage of this is that when an application has been loaded and is being run by one user, further users share the same object code in memory. This results in performance gains, reduced memory consumption and also provides a high degree of scalability for Recital applications.
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The ShellEd plugin is a good shell editor for Eclipse
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Recital 10 enhances the APPEND FROM command. The enhancement added the following syntax ;
APPEND FROM  TYPE CSV <file-name.csv> 
The TYPE keyword has now been enhanced to support a comma separated values (CSV) format
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Recital is a rich and versatile product with many ways to do the same thing. Developers usually write code in the way that they are accustomed to without paying much attention to how this will perform in a multi-user environment with large amounts of users and transactions. The best way to optimize Recital applications is to use the built-in tuning capabilities introduced in Recital 10.

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Recital provides a wide variety of connectivity solutions to external data sources. This article provides an overview.
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This guide will assist you in setting up an rsnapshot backup server on your network. rsnapshot uses rsync via ssh to perform unattended backups of multiple systems in your network. The guide can be found on the centos website here.

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lslk lists information about locks held on files with local inodes on systems running linux.

Install it with:

yum install lslk
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