Archivio tag: troubleshooting

Bookmarks for 16 gen 2013 through 17 gen 2013

These are my links for 16 gen 2013 through 17 gen 2013:

  • Graylog2 – Free open source self-hosted log management and exception tracking – Simple log management
    Graylog2 enables you to unleash the power that lays inside your logs. Use it to run analytics, alerting, monitoring and powerful searches over your whole log base. Need to debug a failing request? Just run a quick filter search to find it and see what errors it produced. Want to see all messages a certain API consumer is consuming in real time? Create streams for every consumer and have them always only one click away.

    Free and open source
    Graylog2 is free and open source. It is licensed under the GNU General Public License v3 (GPLv3) and all source code can be browsed on GitHub. The web interface is using Ruby On Rails, the server is written in Java.

    Used by professionals
    The first version of Graylog2 was released in July 2010. Since then there has been rapid and continuous development and a number of major releases.

  • Centralizzare i log mediante Elasticsearch, Logstash e Kibana – Mia mamma usa Linux! – Uno dei principali problemi che si rilevano in fase di debug delle anomalie relative ad applicazioni è la frammentazione delle informazioni. Tanti log, buona parte dei quali inutili, sono sparsi ovunque nelle macchine interessate all’erogazione di questo o quel servizio.
    Tipicamente quando si tratta di servizi ripartiti su più macchine è sempre necessario aprire diverse console all’interno delle quali, per ciascuna macchina, il (o i) file di log vengono aperti, filtrati stampati e via così, sino ad ottenere una situazione degna di Sherlock Holmes, in cui solo consumati ed abili detective riescono a trovare l’indizio che sfugge ai più.

    Esiste però una via migliore per gestire enormi quantità di log in una forma centralizzata, facilmente ricercabile e che usi un’interfaccia gradevole. Si tratta della combinazione di tre software: Elasticsearch, Logstash e Kibana.

  • Seminario “Evoluzione della virtualizzazione su Linux”: video uno e due – “Introduzione” e “Virtualizzazione” – Mia mamma usa Linux! – Nella giornata del 29 giugno 2012, presso l’hotel Holiday Inn di Rho si è svolto il secondo seminario di miamammausalinux.org, intitolato quest’anno “Evoluzione della virtualizzazione su Linux“.

    Viste le numerose richieste ricevute e rispettando sempre la filosofia alla base del progetto miamammausalinux.org, il video del seminario viene proposto integralmente nelle sue parti, insieme alla documentazione fornita ai partecipanti.

    Ecco le prime due parti.

Bookmarks for 15 gen 2013 through 16 gen 2013

These are my links for 15 gen 2013 through 16 gen 2013:

  • Simplify Advanced Shell Scripting With Ruby | AIX | IBM Systems Magazine | System p, System p5, Power System | Ruby, SSH, shell scripting, Bull Freeware, sysadmin, – IBM Systems Magazine – Ruby is just for experienced programmers. right? False! Originating in the mid-1990s, Ruby is a fantastic language, made popular recently by the Web application framework—Ruby on Rails. It’s a massively flexible and easy language to learn. You can find Ruby for AIX in the AIX Toolbox at the Bull Freeware. The script we’ll be creating will do the following:

     

    * Go through a large list of servers.
    * SSH them and determine whether the server is AIX.
    * If so, it will go through all disks, returning their type.
    * It will do all of this completely in parallel in batch at 25 sub-processes at a time.

  • Recovering a lost partition table with a VMFS volume | vInfrastructure Blog – Vi possono essere diversi motivi che portano alla perdita della tabella delle partizioni o alla sua corruzione. Nel caso di datastore VMFS le possibili cause sono: resignature da un altro sistema (ad esempio il backup server, nel caso funzioni in SAN mode), un errore umano (basta eseguire, su dischi condivisi, da vSphere Client un Datastore / Delete da un ESXi non ancora collegato al vCenter Server), o anche a causa di qualche problema lato storage (mi è capitato proprio questo caso di recente su uno storage entry level)[...]

    (Mi è capitato, ho seguito la kb di vmware e ne sono uscito. Comunque sto sudando ancora adesso…)

  • DataFart – DataFart lets you easily graph data from the command line.

Bookmarks for 28 dic 2012 through 9 gen 2013

These are my links for 28 dic 2012 through 9 gen 2013:

  • PeteNetLive – KB0000741 – HP and Cisco – VLANs and Trunks Confusion! – When I first started in IT, I went and did my Cisco CCNA. So I learned that to connect Cisco switches and pass VLAN traffic between them, I needed to create a 'Trunk' to pass the VLAN traffic. Fast forward a few years, and I now work for an HP reseller. Very early on I came to realise that what HP called a 'trunk' was very different from what I had been taught. Below is an article I did a while ago about setting up HP Trunks.
  • OpenNOP – Open Network Optimization Platform – OpenNOP is an open source Linux based network accelerator. It's designed to optimise network traffic over point-to-point, partially-meshed and full-meshed IP networks.
    The goal of OpenNOP is to increase network performance over low speed network connections such as ISDN, DSL, DS1, frame-relay, VPN and other network circuits. To accomplish this we can use a variety of techniques such as compression, deduplication, caching and protocol spoofing.
    The objectives for OpenNOP are:
    Produce a low cost solution to increase network performance, improve the end user experience and deliver this in a easy to use appliance image.
    Provide a single solution for networks on terrestrial, cellular and satellite systems.
    Facilitate an open framework that can be extended by 3rd party modules to improve specific network traffic.
  • Deon’s World – Understanding and using htop to monitor system resources – Every so often there will be something that slows a system down. There are a few tools that can help to identify which process is the cause of this slow down. One such tool is htop. Htop is an interactive and real time process monitoring application for Linux which will show you your usage per cpu/core, as well as a meaningful text graph of your memory and swap usage.

Bookmarks for 27 dic 2012 through 28 dic 2012

These are my links for 27 dic 2012 through 28 dic 2012:

  • SyBooks Online: Back Up Data to a New Table (on sybase 12.x) – Copy the data from the corrupted table into a new table by creating a dummy table, and copying the old data into the dummy table.
  • Netl33ts: Cisco VPN Troubleshooting Guide – It is important to understand how IPSEC works in order to understand how to troubleshoot a VPN connection. This is a quick overview of IPSEC and is by no means a complete detailed guide.
  • TunnelsUP: Home – Welcome to tunnelsup.com! This site aims to document how to set up, troubleshoot and understand everything to do with Cisco VPN concepts. Here you will find scripts for putting together a tunnel, troubleshooting tips and videos that will teach concepts and demonstrate various VPN technologies.