howto

Bookmarks for 9 March 2017

These are my links for 9 March 201:

  • Relentless Coding – A Javascript malware analysis tool using static analysis / deobfuscation techniques and an execution engine featuring HTML DOM emulationRead more »
  • Deis | Your Paas. Your Rules. – Deis (pronounced DAY-iss) is an open source PaaS that makes it easy to deploy and manage applications on your own servers. Deis builds upon Docker and CoreOS to provide a lightweight PaaS with a Heroku-inspired workflow.
  • Speed up WordPress on DreamHost with OPcache
    Installing OPcache can improve your site’s performance by decreasing the php execution process when a script is requested. DreamHost permits a user to log into the server through secure shell with user level permissions. Since user level permissions cannot install software, the module will need to be manually compiled.
  • Reduce TIME_WAIT socket connections | Linux BrigadeReduce TIME_WAIT socket connections in Apache/Linux
    Some time in your life you’ll run across an Apache server that always has tons of TIME_WAIT connections just seeming to hang out. While these don’t take up as many resources as an ESTABLISHED connection, why keep them around so long? This short article will show you how to identify how many you have, and how to tell your server to reduce them, reuse and recycle them (see, recycling IS a good thing).
  • Analyzing Apache Log Files < System | The Art of Web
    There are many different packages that allow you to generate reports on who’s visiting your site and what they’re doing. The most popular at this time appear to be “Analog”, “The Webalizer” and “AWStats” which are installed by default on many shared servers. While such programs generate attractive reports, they only scratch the surface of what the log files can tell you. In this section we look at ways you can delve more deeply – focussing on the use of simple command line tools, particularly grep, awk and sed.

Bookmarks for 23 lug 2015 from 17:27 to 17:47

These are my links for 23 lug 2015 from 17:27 to 17:47:

  • How to fix yum errors on CentOS, RHEL or Fedora – Xmodulo – Yum is a package management tool for installing, updating and removing rpm packages on RedHat-based systems. When you try to install a package with yum command, you may encounter errors for various reasons. In this post, I will describe under what situations yum errors can occur, and explain how to fix yum errors.
  • Docs/RpmRecovery – rpm – Trac – This document provides an overview of how to deal with RPM database corruption.
  • RepoCreate – yum – Trac – Sometimes you'll find you need to be able to collect a bunch of rpm packages you have together in one place and you want to make them available to your systems running yum. It is pretty easy to do.
  • Local YUM fun | Adamish | Blog – If you’re installing redhat on a machine without Internet access you may wish to setup a local YUM repository for extra bits and pieces after the main install. Add the following to /etc/yum.repos.d/local.repo. If there are any other .repo files in /etc/yum.repos.d then comment out their contents. Make sure you don’t have spaces in your baseurl.
  • How to fix yum [Errno -1] Metadata file does not match checksum › Backdrift Backdrift – I recently upgraded my local yum repository server to RHEL6. After upgrading I noticed the below error when my el5 clients would attempting to install packages from the local repo with yum.

Bookmarks for 12 mag 2015 through 15 mag 2015

These are my links for 12 mag 2015 through 15 mag 2015:

  • slack for ubuntu – ScudCloud is a non official open-source Linux (Debian, Ubuntu, Kubuntu, Mint, Arch) desktop client for Slack©. Slack© is a platform for team communication. ScudCloud uses the QT library + Webkit to render the web version of Slack, but using the QWebkit-Native bridge to improve desktop integration with: multiple teams support, native system notifications, count of unread direct mentions at launcher/sytray icon, alert/wobbling on new messages, channels quicklist (Unity only), optional "Close to Tray".
  • How to create an RPM package – FedoraProject – This page describes in detail how to create an RPM package, and in particular, how to create a SPEC file. Unlike other RPM guides, this page explains the specifics for Fedora with links to Fedora-specific guidelines. Since it is maintained through the Fedora Wiki, it is likely to be more up-to-date than other guides. Despite the focus on Fedora, most of this document does apply to other RPM-based distributions.
  • How To Install Elasticsearch, Logstash, and Kibana 4 on CentOS 7 | DigitalOcean – In this tutorial, we will go over the installation of the Elasticsearch ELK Stack on CentOS 7—that is, Elasticsearch 1.4.4, Logstash 1.5.0, and Kibana 4. We will also show you how to configure it to gather and visualize the syslogs of your systems in a centralized location. Logstash is an open source tool for collecting, parsing, and storing logs for future use. Kibana 4 is a web interface that can be used to search and view the logs that Logstash has indexed. Both of these tools are based on Elasticsearch.

Bookmarks for 20 dic 2014 through 17 gen 2015

These are my links for 20 dic 2014 through 17 gen 2015:

  • Assembly Instructions – IKEA – Here you will find a list of our assembly instructions for our products which you can download and print right from your own computer!
  • DeZhi Mainframe User Support Site – Get your own free mainrfame account, with TSO/CICS access
  • Phabricator – Phabricator is a collection of open source web applications that help software companies build better software.

Bookmarks for 3 dic 2014 from 13:03 to 13:41

These are my links for 3 dic 2014 from 13:03 to 13:41:

  • git-flow cheatsheet – git-flow are a set of git extensions to provide high-level repository operations for Vincent Driessen's branching model. more This cheatsheet shows the basic usage and effect of git-flow operations
  • Voluntary – […] Our goal is to create open source software that promotes freedom of expression, privacy and the decentralization of power with an eye towards usability […] (Just for OSX at the moment)
  • A Visual Git Reference – This page gives brief, visual reference for the most common commands in git. Once you know a bit about how git works, this site may solidify your understanding.
  • SSH_VPN – Community Help Wiki – This page discusses using SSH to set up SSH-based point to point connections, which can then be used to create routes that create virtual private networks. Note that using SSH in this fashion is not the "best" way to create a permanent, stable VPN. Notably, SSH uses TCP, and TCP over TCP can provide abysmal performance under pathological conditions.
  • VPN over SSH – This how-to is intended to cover the details of how to establish a VPN (Virtual Private Network) over a SSH connection. Starting with open-ssh 4.3, you can now use a ssh connection to set up a VPN. This is technically termed "layer-3 IP-in-SSH tunnelling" and is not using ssh to port forward (ssh -L ) or create a dynamic "application level" forwarding (SOCKS) (ssh -D ). Rather a VPN is established using a SSH connection to create a virtual interface, tun0. Advantages : IMO, this technique is easier to set up then openvpn, especially if you are using a single client. Works with most Linux distributions without the need to install any additional software on the clients. The server only needs openssh-server. This protocol uses udp to transmit tunneled tcp connections resulting in a more stable connection compared with port forwarding (using ssh with the -L or -D options). Disadvantages : As of yet I do not know of a windows client which will use this protocol. If you are needing to set up a VPN with numerous clients I would use openvpn. Although there are several "how-to's" on the web, most of them assume you know something about networking and routing. This page attempts to explain some of the "missing details".

Bookmarks for 31 ott 2014 through 1 nov 2014

These are my links for 31 ott 2014 through 1 nov 2014:

  • check_jvm – Nagios Exchange – JvmInspector is standalone tool + Nagios wrapper plugin (check_jvm) that dumps various properties from locally running JVMs. This information includes: * Heap & non-heap memory * Running threads * Loaded classes * Running java version, paths & arguments * On App servers only: Container server name & total active sessions (tested & supported app servers are tomcat5+ and jboss4+) JvmInspector doesn't need local or remote JMX network socket. It directly attaches to JVM's PerfData, so it MUST be started with the same USERid as the target JVM!
  • Raspberry Pi VPN Gateway – Netflix finally arrived in Germany, but guess what? It's library is heavily limited in comparision to the US one and if you like TV series as much as I do, you don't want to wait until they eventually release it year(s) later for us german users. Maybe you've heard recently of Anonabox — a small device with two ethernet ports that you can plug in front of your router and everything behind the device is routed through Tor (side note: turned out to be a scam and got pulled from Kickstarter in the end). However, it made me come up with an idea: Instead of having a Tor-box, I want a VPN-box that is connected to my PrivateInternetAccess VPN. If I'm in need of a VPN connection I just switch the WiFi network and I'm good to go. This way I can easily watch US content from Netflix as well as unblock location restricted content like YouTube, even with my iPhone or Xbox[…]
  • My Tmux Setup on unwiredcouch.com – I've been using tmux as my main terminal multiplexer for about 3 years now and have refined my configuration over time to fit my daily workflow. Which is usually a mix of writing code, chef recipes, remote login into different servers and various shell tasks. This is a flexible setup that doesn't concentrate too much on doing a specific thing or replacing an IDE inside of tmux.

Bookmarks for 30 ott 2014 from 17:30 to 21:39

These are my links for 30 ott 2014 from 17:30 to 21:39:

  • Profanity, a console based XMPP client – Home – Profanity is a console based XMPP client written in C using ncurses and libstrophe, inspired by Irssi Latest release: 0.4.4 Downloads: profanity-0.4.4.tar.gz profanity-0.4.4.zipProfanity will run on Linux, Mac OS X and Windows (using Cygwin).
  • Vim is your new IDE /* Devcharm */ – What happens when you combine Vim with the terminal multiplexer Tmux? You have the perfect coding environment. Here are some recommendations I've collected in the past years. Now I can happily fire up my working environment running Vim, some local servers and tests, in no time.
  • Vim and Tmux on your Mac – Setting up your computer for Vim and Tmux often comes with a few issues. Here's how to manage plugins for Vim and use Tmux to boost your productivity, as well as settle a few common issues.

Bookmarks for 17 ott 2014 through 20 ott 2014

These are my links for 17 ott 2014 through 20 ott 2014:

  • microHOWTO: Configure Apache to use Kerberos authentication – To configure Apache to use Kerberos authentication Kerberos is an authentication protocol that supports the concept of Single Sign-On (SSO). Having authenticated once at the start of a session, users can access network services throughout a Kerberos realm without authenticating again. For this to work it is necessary to use network protocols that are Kerberos-aware. In the case of HTTP, support for Kerberos is usually provided using the SPNEGO authentication mechanism (Simple and Protected GSS-API Negotiation). This is also known as ‘integrated authentication’ or ‘negotiate authentication’. Apache does not itself support SPNEGO, but support can be added by means of the mod_auth_kerb authentication module.
  • How to create a bootable USB stick on OS X | Ubuntu – […] Note: this procedure requires that you create an .img file from the .iso file you download. It will also change the filesystem that is on the USB stick to make it bootable, so backup all data before continuing […]
  • thomastk/kunjumon – Kunjumon is a framework that can be used to create plugins for Nagios monitoring system, without writing any new code. The plugins thus created are robust, and, can monitor complex scenarios by querying data from multiple databases. While efforts to build such plugins would require considerable scripting work, using Kunjumon framework, a a plugin that pulls input data from databases can be implemented by defining it in XML format, and, there is no need to write any code to support it. The Kunjumon framework has been tested on all the Linux platforms, and against MySQL, Postgres, Oracle and Microsoft SQL Server. However, in general, it would work with any ODBC interface configured on the Nagios host to access a data repository.

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 8 lug 2014 through 11 lug 2014

These are my links for 8 lug 2014 through 11 lug 2014:

  • Tips & Tricks for the Command line of Linux – cfenollosa.com/misc/tricks.txt – I have marked with a * those which I think are absolutely essential Items for each section are sorted by oldest to newest. Come back soon for more!
  • Naming Schemes – A good naming scheme is scalable, unique, and easy to remember. The purpose of these naming schemes is to name networked servers, wireless access points or client computers, but it can also be used to name projects, products, variables, streets, pets, kids, or any other project where unique names and rememberable names are required.
  • SSD Cloud Hosting & VPS – MNX.io – Here at MNX, we’ve been busy setting up a brand new data center for our cloud hosted services. We started off as a consulting company providing managed Linux services, which means we have been exposed to a ton of different customer environments and an equal number of schemes for naming equipment…not all of them good. It’s a problem that goes back as far as computers have existed, and everyone has their own opinion on the “best” way to name hosts. Most methods start out fine at the beginning, but quickly become unwieldy as infrastructure expands and adapts over time.
  • Trello – Organize anything, together. Trello is a collaboration tool that organizes your projects into boards. In one glance, know what's being worked on, who's working on what, and where something is in a process.
  • Vim Awesome – AWESOME VIM PLUGINS from ACROSS THE UNIVERSE