troubleshooting

Bookmarks for 5 ago 2011 through 8 ago 2011

These are my links for 5 ago 2011 through 8 ago 2011:

  • VMware: VMware ESXi Chronicles: Ops changes part 6 – Quick troubleshooting tips –
  • VMware: VMware ESXi Chronicles: After you migrate, tips on working with ESXi… – I’ve recently provided a lot of information on how to migrate to ESXi, so today I thought it would be good to go over some post-migration concerns.  Here's my "top 5" list of important ESXi post-migration considerations.
  • Aggiungere drivers a ESXi 4.1 – Mi è capitato recentemente di preparare un server HP Proliant DL360 G6 per un cliente. La macchina era dotata della classica scheda onboard dual port broadcom, ed era stata comprata inoltre una scheda di rete quad-port HP NC365T, basata sul chipset Intel 82580 MAC.<br />
    <br />
    Purtroppo, nemmeno l’ultimo ESXi 4.1 u1 riconosceva la scheda con i drivers in dotazione.<br />
    <br />
    E’ stato dunque necessario procedere all’installazione dei drivers aggiuntivi, seguendo questa procedura:
  • Oltrelinux.com » Firewall con Linux (2003) – Mi hanno chiesto se era possibile rendere disponibile il pocket sui Firewall che allegammo anni fa (Linux&C. n. 34!!)… ho chiesto l’ok al Direttore ed eccoci qua, il PDF (download, 1.8Mb) è stato rigenerato a partire da quello definitivo che è andato in stampa[…]<br />
    <br />
    Grande Linux&C

Bookmarks for 18 mag 2011 through 28 mag 2011

These are my links for 18 mag 2011 through 28 mag 2011:

Bookmarks for 11 feb 2011 through 15 feb 2011

These are my links for 11 feb 2011 through 15 feb 2011:

Bookmarks for 8 feb 2011 through 11 feb 2011

These are my links for 8 feb 2011 through 11 feb 2011:

  • Easy packet captures straight from the Cisco ASA firewall … – Takeaway: Lori Hyde tells you how to capture packets directly from the Cisco ASA without using a separate packet-sniffing utility, first by setting up an ACL to define the traffic and then using the capture command.
  • 500 Internal Server Error – 500 Internal Server Error
  • Home – Prepaid Wireless Internet Access – The frequent and occasional traveler requiring access to the Internet knows the problem: You are there, your notebook is there but no Wifi hotspot. But don't despair. 2G and 3G cellular operators in some countries offer wireless Internet access using GPRS/EDGE/UMTS via prepaid SIM cards. <br />
    For outsiders, it's a bit difficult to find out if such an offer is available at the destination. This Wiki aims to help finding such offers. The search the Wiki for a particular country, enter its name in the search dialog box on the left. In case you travel to countries for which you can't find a local offer, take a look at Vodafone WebSessions, which can be used to access the Internet in most European countries and also some countries elsewhere with a prepaid card for a daily fee.<br />
    [via MCC]

Bookmarks for 24 set 2010 through 28 set 2010

These are my links for 24 set 2010 through 28 set 2010:

  • xCAT – Extreme Cloud Administration Toolkit – xCAT offers complete and ideal management for HPC clusters, RenderFarms, Grids, WebFarms, Online Gaming Infrastructure, Clouds, Datacenters, and whatever tomorrow's buzzwords may be. It is agile, extendable, and based on years of system administration best practices and experience.
  • CoolSQL-Database-JDBC, Ibatis-Ibator(Abator) – CoolSQL is a cool tool used to view and manage database. It provides a nice user interface which makes a wonderful experience to user. CoolSQL inclineds to view and analyze data in the database, provides abundant functions including querying, modifying, exporting, supporting sqlscript and analyzing data. Convenience and maneuverability are the most advantages of CoolSQL. CoolSQL is written in java, thus it should run on any operating system that provides a Java Runtime (1.5 or above).
  • ottimizzazioni (quasi) estreme – In fondo, perché far ricomprimere ad Apache lo stesso file centomila volte al giorno, se questo non cambia praticamente mai? Non sarebbe possibile comprimerlo “a priori” e poi istruire il server a fornire la giusta versione a seconda che il browser dell’utente supporti o meno il formato gzip? A quanto pare la risposta è si
  • Trouble-Maker – Being a system administrator is full of interesting challenges. We like this. However, some of these challenges can be problematic, if they cause service interrupts on production systems. Most system administrators have run into the situation where something is wrong, the server is down, and we don't know what is going on. This project attempts to help.<br />
    <br />
    There are a lot of tools out there to make the system administrator's life easier. However, no tool is a replacement for properly understanding the system and experience in troubleshooting unknown situations. This is where Trouble-Maker comes in. Unlike other projects, we do not attempt to solve problems — we cause them.
  • iScanner – Remove website malwares, web pages viruses and malicious codes – iScanner is a free open source tool lets you detect and remove malicious codes and web page malwares from your website easily and automatically. iScanner will not only show you the infected files in your server but it's also able to clean these files by removing the malware code ONLY from the infected files.<br />
    <br />
    [ via http://www.bufferoverflow.it/ ]

Bookmarks for 30 gen 2010 through 7 feb 2010

These are my links for 30 gen 2010 through 7 feb 2010:

  • flashrom – flashrom is a utility for identifying, reading, writing, verifying and erasing flash chips. It's often used to flash BIOS/EFI/coreboot/firmware images.
    via ossblog
  • glype proxy script – free anonymous proxies list – Glype proxy script is a free-to-use, web-based proxy script written in PHP. Similar to a typical proxy server, a web-proxy script downloads requested web pages and files and forwards them back to the user. The service is provided by a web page itself, which allows instant access to the proxy without editing your browser connection settings[…]

    via .mau.

  • Repairing and re-registering the WMI – If you experience behavior when using WMI, such as application errors or scripts that used to work are no longer working, you may have a corrupted WMI repository. To fix a corrupted WMI repository, use these step…
  • Tuning the AIX file caches – Wikistix – By default, AIX is tuned for a mixed workload, and will grow its VMM file cache up to 80% of physical RAM. While this may be great for an NFS server, SMTP relay or web server, it is very poor for running any application which does its own cache management. This includes most databases (Oracle, DB2, Sybase, PostgreSQL, MySQL using InnoDB tables, TSM) and some other software (eg. the Squid web cache).

    Common symptoms include high paging (high pgspin and pgspout in topas), high system CPU time, the lrud kernel thread using CPU, slow overall system throughput, slow backups and slow process startup.

    For most database systems, the ideal solution is to use raw logical volumes. If this is not acceptable, then direct I/O and concurrent I/O should be used. If for some reason this is not possible, then the last solution is to tune the AIX file caches to be less aggressive

Bookmarks for 6 gen 2010 through 8 gen 2010

These are my links for 6 gen 2010 through 8 gen 2010:

  • Tools – Mt Xia – Downloads,Business Continuity,Disaster Recovery,High Availability,Virtualization,Data Center Automation,Audit Response,Audit Compliance,Security Assessment,Technical Support
  • pWare – AIX Open Source software for IBM AIX 5.3 and 6.1 – AIX Open Source software for IBM System p server (formerly pSeries and RS/6000) machines running AIX 5.3 and higher. My name is Bill Jojo and I work at Hudson Valley Community College where we use a significant amount of Open Source software to manage our environment.
  • Create AIX NIM master – NIM is better in that you can install a new OS from a mksysb in as little as 5 minutes versus installing from CD which can take 40 minutes or longer. You can also keep your builds consistent if you have one mksysb image to build an AIX server. This also makes server builds easier at remote locations, no more swapping CD’s[…]
  • AixErrorLogCustomization < AIS < TWiki – AIX has a very flexible error logging daemon to log hardware and software errors. The log is typically accessed with the errpt command.
    Unfortunately, checking the log is a manual process. Using some custom ODM entries, we can cause AIX to run commands in response to errors, which can then be used for notification.
    Below I document a simple configuration which uses the ODM to log each error entry to syslog, and forward the complete entry via email.
  • c99madshell Security Review – Derek Fountain – A friend of mine got hacked recently. Some charming person managed to upload a rogue file to his server and replaced some of the software executables he produces with versions containing trojans and viruses.

    It seems there's not a lot of information available that describes just what is possible from an uploaded file vulnerability. So I grabbed a copy of 'c99madshell', which is one of the more popular scripts used by script kiddies, and had a look at what it can do. Here's what I found…

Bookmarks for 18 dic 2009 through 22 dic 2009

These are my links for 18 dic 2009 through 22 dic 2009:

  • Welcome to Computers-it – A resource for Computers and Information Technology – Articoli vari su linux, aix, TSM, soluzioni a problemi curiosi, note sulle peculiarità (/proc per linux, HACMP su AIX, etc).
  • How to install AIX 5L – Summary:  Get step-by-step instructions for a number of generic AIX® system setup procedures. These instructions should work for any of the AIX™ 5L releases. Variations, if any, should be minor.
  • Welcome to Linux on Power wiki! – This wiki provides a forum for Linux users on PowerPC-based systems. It is oriented at the IBM POWER systems (System p p5 and p6), but topics covering i5 (iSeries), embedded 32-bit based PowerPC systems as well as Apple systems are also welcome.
    There is also an IBM hosted Wiki at http://www.ibm.com/collaboration/wiki/display/LinuxP – you may find more information on IBM system p5 servers and linux there.

Bookmarks for 15 dic 2009 from 18:36 to 19:16

These are my links for 15 dic 2009 from 18:36 to 19:16:

  • Making Open Source Convenient | JumpBox Virtual Appliances and Applications for Cloud Computing – It's a ready-to-deploy virtual computer that contains a pre-configured instance of an application. Self-contained, secure and optimized – it gives you the value of Open Source software without the headaches. A JumpBox has the following qualities:

    Easy to deploy on Mac, Windows or Linux.
    Portable across operating systems and cloud environments.
    Simple to manage with a web-based administration interface.
    Protected by a built-in, automated backup system.
    Isolated from interfering with existing software.
    Flexible to allow you to move between virtual and cloud systems.
    Proven through collective usage of thousands of people

  • Waldemar Mark Duszyk – Un blog su AIX molto bello, lezioni, trucchi, script.
    Materiale base e avanzato
  • Troubleshoot Connections through the PIX and ASA – Cisco Systems – This document provides troubleshooting ideas and suggestions for when you use the Cisco ASA 5500 Series Adaptive Security Appliance (ASA) and the Cisco PIX 500 Series Security Appliance. More often than not, when applications or network sources break or are not available, firewalls (PIX or ASA) tend to be a primary target and blamed as the cause of outages. With some testing on the ASA or PIX, an administrator can determine whether or not the ASA/PIX causes the problem.
  • Ricerche IT » Sniffing del traffico di rete con Cisco ASA 5505 – Può capitare, alle volte, di trovarci nella necessità di dover fare troubleshooting sulla nostra rete in conseguenza di un qualche malfunzionamento (software o hardware che sia); in alcuni casi, può essere estremamente utile “sniffare” il traffico di rete, cioé avere in una qualche forma comprensibile all’essere umano l’insieme (o, più spesso, un sottoinsieme) delle comunicazioni che avvengono sulla rete[…]

Bookmarks for 23 nov 2009 through 9 dic 2009

These are my links for 23 nov 2009 through 9 dic 2009:

  • Secure Password Generator – Primo Interactive Website Design and … – Secure Password Generator (Bulk Generate Secure Passwords)
  • How to Tell the Difference Between Nerds and Geeks – wikiHow – The terms 'nerd' and 'geek' are often used interchangeably, but they are not the same…
  • NConf – Enterprise Nagios configurator [NConf – Enterprise Nagios configurator] – NConf is a PHP based web-tool for configuring the Nagios monitoring software. It differs from similar tools by offering enterprise-class features like templates, dependencies and the ability to configure a large-scale, distributed Nagios server topology.

    via Giorgio Zarrelli

  • IBM Redbooks | NFS Mount Problem Determination – This technote shows some common NFS mount problems on AIX and gives you some ideas on how to solve them. These connectivity issues can occur when you are trying to mount an exported IBM TotalStorage NAS Gateway 500 NFS share from any NFS client (UNIX/AIX/Linux).
    [ma porkapaletta… error -1 = l'host non risolve l'ip :P]
  • Desktop Wiki [Share Knowledge] – Desktop Wiki is a wiki that runs in desktop environment(only in MS Windows currently), based on dokuwiki, PHP and nginx. The features of Desktop Wiki include:

    *
    Portable wiki that can run anywhere, even in your USB stick.
    *
    Full features of the excellent dokuwiki(Powerful wiki with flatfile, stable, multilanguages, etc).
    *
    Low system resource cost thanks to nginx.
    *
    And more for you to discover:).