In the previous article we looked at what’s the use LVS, to have a system of load balancing built into the Linux kernel. As mentioned, however, LVS was born to be good in one thing: the load balance, but does not provide additional options, such as monitoring the progress of the machines on which we are balancing service and in case of trouble in one machine remove it from the active machines.
To accomplish this goal and many more wel” take a look at ldirectord
Linux Virtual Server, LVS is an advanced load balancing solution for Linux systems. It is an open source project started by Wensong Zhang in May 1998. The mission of the project is to build a high-performance and highly available server for Linux using clustering technology, which provides good scalability, reliability and serviceability.
The major work of the LVS project is now to develop advanced IP load balancing software (IPVS), application-level load balancing software (KTCPVS), and cluster management components.
On the web there are plenty of guides related to iptables, the firewall included in all the latest Linux distributions.
iptables is a user space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall (implemented as different Netfilter modules) and the chains and rules it stores. Different kernel modules and programs are currently used for different protocols; iptables applies to IPv4, ip6tables to IPv6, arptables to ARP, and ebtables as a special for Ethernet frames.
Usually I work only with the software, I’m not an expert of the hardware, but the excellent presentation by Riccardo Lemmi made me want to read a bit of material on the world of open hardware in general and Arduino in particular.
Open source hardware ( OSHW ) consists of physical artifacts of technology designed and offered in the same manner as free and open source software (FOSS). Open source hardware is part of the open source culture movement and applies a like concept to a variety of components. The term usually means that information about the hardware is easily discerned. Hardware design (i.e.schematics, bill of materials and PCB layout data) in addition to the software that drives the hardware are all released with the FOSS approach .
In several commonly used shell commands can be shortened with convenient alias, a classic example is:
alias ll='ls -al'
Also in this field zsh has some interesting features, which enable you to define traditional aliases but also things a bit more particular.