linux

Bookmarks for 28 ago 2014 from 09:32 to 11:55

These are my links for 28 ago 2014 from 09:32 to 11:55:

  • Keepalived for Linux – Keepalived is a routing software written in C. The main goal of this project is to provide simple and robust facilities for loadbalancing and high-availability to Linux system and Linux based infrastructures. Loadbalancing framework relies on well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 loadbalancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage loadbalanced server pool according their health. On the other hand high-availability is achieved by VRRP protocol. VRRP is a fundamental brick for router failover. In addition, Keepalived implements a set of hooks to the VRRP finite state machine providing low-level and high-speed protocol interactions. Keepalived frameworks can be used independently or all together to provide resilient infrastructures.
  • The BIRD Internet Routing Daemon Project – BIRD is an Internet Routing Daemon designed to avoid all of these shortcomings, to support all the routing technology used in the today's Internet or planned to be used in near future and to have a clean extensible architecture allowing new routing protocols to be incorporated easily. Among other features, BIRD supports: * both IPv4 and IPv6 protocols * multiple routing tables * the Border Gateway Protocol (BGPv4) * the Routing Information Protocol (RIPv2) * the Open Shortest Path First protocol (OSPFv2, OSPFv3) * the Router Advertisements for IPv6 hosts a virtual protocol for exchange of routes between different routing tables on a single host a command-line interface allowing on-line control and inspection of status of the daemon soft reconfiguration[…]
  • How to make MaxScale High Available with Corosync/Pacemaker | MariaDB – MaxScale, an open-source database-centric router for MySQL and MariaDB makes High Availability possible by hiding the complexity of backends and masking failures. MaxScale itself however is a single application running in a Linux box between the client application and the databases – so how do we make MaxScale High Available? This blog post shows how to quickly setup a Pacemaker/Corosync environment and configure MaxScale as a managed cluster resource.

Bookmarks for 27 ago 2014 from 11:57 to 17:02

These are my links for 27 ago 2014 from 11:57 to 17:02:

  • monitoringsucks/tool-repos – Tracking various tools that fit in the monitoring and metrics space
  • OpenELEC Mediacenter – Home – Open Embedded Linux Entertainment Center (OpenELEC) is a small Linux distribution built from scratch as a platform to turn your computer into an XBMC media center. OpenELEC is designed to make your system boot fast, and the install is so easy that anyone can turn a blank PC into a media machine in less than 15 minutes.
  • Raspbmc – Raspbmc is a minimal Linux distribution based on Debian that brings XBMC to your Raspberry Pi.

Bookmarks for 26 ago 2014 through 27 ago 2014

These are my links for 26 ago 2014 through 27 ago 2014:

  • Regular Expressions – Regular expressions ("regexes") are supercharged Find/Replace string operations. Regular expressions are used when editing text in a text editor, to: check whether the text contains a certain pattern find those pattern matches, if there are any pull information (i.e. substrings) out of the text make modifications to the text. As well as text editors, almost every high-level programming language includes support for regular expressions. In this context "the text" is just a string variable, but the operations available are the same. Some programming languages (Perl, JavaScript) even provide dedicated syntax for regular expression operations.
  • MySQL active-passive cluster | Your IT goes Linux – We will use the iSCSI Lun defined in our iSCSI cluster as a shared storage and we will run MySQL in active-passive (fail-over) mode using Pacemaker and Corosync cluster engine. The cluster will have to connect to the iSCSI target, mount the iSCSI partition on one node and start a MySQL service which has all its data on this partition.
  • Perl – […] Perl has horrors, but it also has some great redeeming features. In this respect it is like every other programming language ever created. This document is intended to be informative, not evangelical. It is aimed at people who, like me: dislike the official Perl documentation at http://perl.org/ for being intensely technical and giving far too much space to very unusual edge cases learn new programming languages most quickly by "axiom and example" wish Larry Wall would get to the point already know how to program in general terms don't care about Perl beyond what's necessary to get the job done. This document is intended to be as short as possible, but no shorter[…]
  • Linux Performance – This page links to various Linux performance material I've created, including the tools maps on the right, which show: Linux observability tools, Linux benchmarking tools, Linux tuning tools, and Linux observability sar. For more diagrams, see my slide decks below.
  • AIXchange: Useful Storage Links – Here's an assortment of really good storage-related articles — the majority of which are found on IBM developerWorks — that are worth your time. While some of them are a few years old, they still provide relevant information.

Bookmarks for 26 ago 2014 from 11:20 to 11:53

These are my links for 26 ago 2014 from 11:20 to 11:53:

  • claudioc/jingo – A git based wiki engine written for node.js, with a decent design, a search capability and a good typography.
  • fastmonkeys/stellar – Stellar allows you to quickly restore database when you are e.g. writing database migrations, switching branches or messing with SQL. PostgreSQL and MySQL are supported.
  • Sandstorm Apps – This page is for people who already have a Sandstorm instance set up. Use the buttons below to install apps.
  • Sandstorm – Sandstorm's server-side sandboxing is based on the same underlying Linux kernel features as LXC and Docker. We use the system calls directly for finer-grained control.
  • apenwarr/sshuttle – Transparent proxy server that works as a poor man's VPN. Forwards over ssh. Doesn't require admin. Works with Linux and MacOS. Supports DNS tunneling.

Bookmarks for 26 ago 2014 from 13:53 to 15:35

These are my links for 26 ago 2014 from 13:53 to 15:35:

  • Petr’s blog about Linux: Systemd Cheatsheet –
  • List of IXPs – Euro-IX – List of known IXPS around the globe
  • Cloud Orchestration & Cloud Automation the DevOps Way | Cloudify – Orchestrate Real Apps on the Cloud with Cloudify Achieve a smooth transition to the cloud and easy automation of even the most complex applications throughout their entire lifecycle with Cloudify. Orchestrate the creation of the whole cloud infrastructure required for your application, starting from compute resources all the way down to networks and block storage devices. Cloudify will then deploy your applications to the cloud (OpenStack, VMWare vSphere, or even bare metal like Softlayer), monitor their progress and scale them when needed. With Cloudify, you won’t be locked in to any one cloud provider or one type of cloud; deploy the same application in your own data center or on the cloud of your choice using your favorite automation and configuration management tools. Monitor, manage and scale your application with Cloudify, whatever the topology or technology stack.

Bookmarks for 26 ago 2014 from 10:58 to 11:18

These are my links for 26 ago 2014 from 10:58 to 11:18:

  • okvm – Open source KVM over IP technology – The okvm project team in 2005 developed an open source okvm KVM Development Kit – so engineers could cost effectively roll their own integrated KVM over IP control appliances. These okvm KVM Development kits included: one okvm PCI KVM Adapter card the okvm KVM over IP software source code the source information needed to manufacture the okvm PCI KVM Adapter card (circuit diagrams, BOM,PCD layout etc) A number of the KVM PCI cards were produced – sponsored by Opengear. However this project did not find traction in the developer community. So kits are no longer available and development in this branch of the project has stopped. Also Opengear now sells a proprietary KVM over IP solution!
  • Exotic VPS – Listing offshore and exotic VPS hosts in Asia, South America, Europe, Africa
  • Interactive map of Linux kernel –
  • Riemann – A network monitoring system – Riemann aggregates events from your servers and applications with a powerful stream processing language. Send an email for every exception raised by your code. Track the latency distribution of your web app. See the top processes on any host, by memory and CPU. Combine statistics from every Riak node in your cluster and forward to Graphite. Send alerts when a key process fails to check in. Know how many users signed up right this second. Riemann provides low-latency, transient shared state for systems with many moving parts.
  • https://nav.uninett.no/#!features – Designed by Scandinavians, this free software makes network administration feel like flying.

Bookmarks for 25 ago 2014 from 15:03 to 17:25

These are my links for 25 ago 2014 from 15:03 to 17:25:

  • Passwordless – A node.js/express module for token-based logins – Token-based authentication middleware for Express & Node.js […] Passwords are broken. Inspired by Justin Balthrop's article Passwords are Obsolete token-based one-time password (OTPW) authentication is faster to deploy, better for your users, and more secure. […]
  • Mounty for NTFS – A tiny tool to re-mount write-protected NTFS volumes under Mac OS X Mavericks in read-write mode.
  • tinc wiki – tinc is a Virtual Private Network (VPN) daemon that uses tunnelling and encryption to create a secure private network between hosts on the Internet. tinc is Free Software and licensed under the GNU General Public License version 2 or later. Because the VPN appears to the IP level network code as a normal network device, there is no need to adapt any existing software. This allows VPN sites to share information with each other over the Internet without exposing any information to others.
  • AIXchange: More Resources for AIX Newbies – As I've noted previously, there are more newcomers to the AIX platform than you might imagine. A company may acquire an AIX system through a merger or replace an old Solaris or HP-UX box with a current IBM Power Systems model. As a result, one of their IT pros suddenly becomes the AIX guy. So, now what? How does an AIX newbie get up to speed with virtualization and AIX?

Bookmarks for 18 ago 2014 through 25 ago 2014

These are my links for 18 ago 2014 through 25 ago 2014:

Bookmarks for 7 ago 2014 through 17 ago 2014

These are my links for 7 ago 2014 through 17 ago 2014:

  • jordansissel/fpm – Effing package management! Build packages for multiple platforms (deb, rpm, etc) with great ease and sanity.
  • Linux incrond inotify: Monitor Directories For Changes And Take Action – I want to copy (rsync to remote server) a directory tree whenever file uploaded or deleted in /var/www/html/upload/ directory under Linux operating systems for backup purpose and/or load balancing purpose without getting into complex file sharing setup such as NFS or GFS iscsi storage. How do I monitor /var/www/html/upload/ and its subdirectory for new files and executes rsync command to make copy back to www2.example.com:/var/www/html/upload/? inotify is an inode-based filesystem notification technology. It provides possibility to simply monitor various events on files in filesystems. It is a very much powerful replacement of (obsolete) dnotify. inotify brings a comfortable way how to manage files used in your applications. The incrond (inotify cron daemon) is a daemon which monitors filesystem events (such as add a new file, delete a file and so on) and executes commands or shell scripts. It’s use is generally similar to cron.
  • Use incron to Trigger Action when File Changes – There are some situations, when you need to start an action or run a command when a given file has changed in your file system. The real life example I have is as follows: I have a git repository, from where I manage this blog, I have a remote branch of it on the same server, from where Nginx serves this pages. I also have another remote branch in my Macbook Pro (With the correspondent Time Machine backup). But, I’m a paranoid guy, so I just want more backups. I decided I wanted to backup all my blog files to my Dropbox account.