One of the quickest ways (faster than scp at any rate) of copying a large number of files between 2 servers is by abusing the awesome powers of Linux’s pipeing and netcat and tar!
Basically we set up netcat listening on the server you want the files copied too which pipes it’s output to tar which extracts anything sent to it.
<br /> root@tanglefoot:/exports/archive# nc -l -p 7878 | tar -xzf -<br />
We handle DNS for thousands of domains for our customers and whilst our existing solution worked it was very messy to maintain and work with so we decided to trial a new solution for our offices to see how it would perform. We wanted something that could be database driven for ease of maintenance and we were personally recommended PowerDNS, so we decided to trial that one first.
For the database we would normally go with MySQL but we wanted an instance of PostgreSQL to play with as we are considering moving our main platform to it at some point in the future.
mod_jk is a conduit between a web server and Tomcat, it supports a variety of web servers including IIS. Using mod_jk to put Apache in front of Tomcat lets you use all the power of Apache (caching, gzip, mod_rewrite, etc) whilst at the same time serving content from Tomcat, also with Ubuntu it’s really easy to set up!
First of all install the software, you will need to enable the backports repository on Dapper for this.
The Linux Virtual Server is a highly scalable and highly available server built on a cluster of real servers, with the load balancer running on the Linux operating system. The architecture of the server cluster is fully transparent to end users, and the users interact as if it were a single high-performance virtual server.
We use LVS extensively at work to provide a scalable and highly available website which gets around 300 hits per second. Setting up and managing LVS can be made a lot easier using a tool that our ex staff wrote called LVSadmin. Written in perl it is easily configurable and provides a curses based front end to manage the servers. Setting up a new LVS cluster is really easy.
Our developers were experiencing a weird problem recently with our SVN installation where they couldn’t copy any files in SVN, they would always get the following error
<br /> svn: COPY of /project/!svn/bc/5121/trunk/path/file.gif: 502 Bad Gateway (https://svn)<br />
A quick fix of course would have been to just create a new file and copy the contents but this wouldn’t have kept the file history. A quick google lead to this page and a solution!
We run a lot of Xen instances for our development and test servers and a few were starting to get full. Fortunately the disks in the real servers were very large and the xenlet partitions were made using LVM so resizing them to add more space was possible!
root@dev-myfiles0:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda1 4.0G 3.8G 200M 95% /
varrun 257M 48K 257M 1% /var/run
varlock 257M 0 257M 0% /var/lock
udev 257M 40K 257M 1% /dev
devshm 257M 0 257M 0% /dev/shm
Basically we just have to shut down the xenlet, resize the partition and then restart the xenlet again, simple!