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  • fail2ban log parsing too slow on Raspberry Pi - options? [migrated]

    - by Gordon Morehouse
    I'm running fail2ban on a Raspberry Pi at 950MHz which I cannot overclock further. The Pi is occasionally subject to SYN floods on particular ports. I've set up iptables to throttle the rate of SYNs on the port of interest; when the throttle limits are exceeded, hosts which send SYNs are dropped into the REJECT chain and the particular SYN packet which exceeded the limit is logged. fail2ban then watches for these logged SYNs and, after seeing a few, temporarily bans the host for a short time (this is a transient issue in the app I'm working with). The problem is that the SYN floods can occasionally reach rates which are too fast for fail2ban to keep up with; I'll see 20-40 log messages per second, and eventually fail2ban falls behind and becomes ineffective. To add insult to injury, it continues consuming a LOT of CPU as it tries to catch up. I have verified that DROP chained packets from hosts already banned by fail2ban are not logged, and thus do not add to its load. What are my options here? I have a few ideas, but no clear path forward. Could I make the log-parse regex "easier" so it takes fewer cycles? Would using iptables --log-prefix to put a token near the start of the log message, and/or otherwise simplifying/altering the fail2ban regex help? Here is the current fail2ban config line containing a regex: failregex = kernel:.*?SRC=(?:::f{4,6}:)?(?P<host>[\w\-.^_]+) DST.*?SYN Is there a faster way for fail2ban to watch for the packets exceeding the limits than parsing kern.log? Could fail2ban be run under PyPy instead of CPython with minimal nonstandard wizardry (the OS is Raspbian 7, so, mostly Debian 7)? Is there something better than fail2ban that I could use to watch for the packets which exceed the SYN limits, and after N exceeds in X seconds, temporarily put the offending IP into the iptables DROP bucket, and take it out when the ban timer expires? Again, I'd vastly prefer a solution that uses as much software available in Debian as possible, though I can build Debian packages in a pinch.

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  • Windows 7 Unidentified Network problem. Cannot connect to the internet.

    - by Gordon
    This is my first time on this website, but I was told this was a good place to ask this. I basically have a problem with Windows 7 connecting to my home network. It keeps identifying my home network as unidentified, and it continually does "identifying" until it simply say cannot connect to the Internet. I don't know how this problem occurred. It simply happened one morning. I am running Windows 7 Ultimate. I have a Realtek Network adapter. I don't think its the drivers. I have already tried system restore to a date when my computer was working fine but it still didn't fix the problem. From what Ive read online there was this bug in the services.msc area, something to do with Bonjour service. I cannot find either so I do not think that was the problem. I'll be online for a while, so I can provide any additional details if needed. I don't really know how to explain it because its so fudging complicated. I really appreciate clear and open steps to solving this. I have tried some things like system restore and rolling back drivers, doesn't seem to help.

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  • RAID Volume is no longer showing in Raid Controller BIOS and in Windows

    - by Gordon
    Hi all, I have installed some critical Windows Updates yesterday and now my external RAID Volume no longer shows in Windows Vista x64. All updates went through successfully. For their description, I cannot see how they should relate to the issue, but this is the only change that happened, so who knows. Anyway, here is the details: I have an external eSata enclosure that is running on a SiI4726 controller. I can connect to the controller with it's management utility from the computer the enclosure is connected to. The three drives in the enclosure show up as JBODs. I had those drives configured to be one logical RAID5 drive. RAID management is done through a SiI3132 SoftRaid controller. The Raid Management Utility just shows empty channels where it usually shows the Raid Group. In the Windows Disk Manager, I can see an unknown unitialized device. This is fine according to the setup manual. What it doesn't show is my Raid drive. It's gone. Also, when booting Windows, the BIOS of the controller used to show the RAID volume before booting the OS. This is not happening anymore. Updating drivers and firmware did not help. I have made sure the drivers and firmware are compatible to each others. And like I said, it used to work before. Any clues?

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  • Clearing Cache in Mail on Snow Leopard

    - by Gordon
    Can anyone tell me how to clear the cache in the Mail application on Snow Leopard? I noticed that it was automatically backing up my gmail messages so it ended up caching 11GB of emails even though that's more than my account. The only solution I seem to be able to find is to delete the files in /Users/me/Library/Mail/MyGmailAccount Is this the best solution or is there a better way?

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  • IIS6 Permissions

    - by Gordon Carpenter-Thompson
    We have a set of IIS6 Jakarta/ASP.NET applications (implemented as virtual directories) on a machine without a domain. The directories all exist under the default website. We need to setup the permissions so that certain users can access only specific applications yet others users can access several of the applications. The way it's been setup previously has been to explicitly deny access to the users for every application except the ones that they are allowed to see. The problem is that the list of applications changes fairly often (for demos etc) and it's been known for the developers to forget to deny the old users access to the new applications which leads to security problems. This is all quite unmaintainable. Does anybody have any advice on this? Surely I can't be the only person to find this all a bit of a mess? Thanks

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  • NFS I/O monitoring

    - by Gordon
    I have a NFS mounted directory, and I'd like to monitor the I/O usage on it (MB/s reads and writes). What's the recommended way to do that ? This is the NFS client, I don't have access to the NFS server. I'm not interested in general I/O usage (otherwise I would use vmstat/iostat). It also has multiple NFS mounts, I'm interested in monitoring just one specific mount (or I might have used ethereal). Thanks!

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  • Accidental Extract Location - How to Clean Up?

    - by Gordon
    Sometimes I will do a command such as unzip tons_of_files.zip And I will forget to put a -d to point to a subdirectory. This causes the current folder to get filled with tons of files that are intermixed with the existing files. What is the best way to remove all these new files and/or move them to a new directory? I want to avoid having to manually examine the directory and determine if the file was part of the archive or was already present.

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  • Volume is no longer showing in Raid Controller BIOS and in Windows

    - by Gordon
    Hi all, I have installed some critical Windows Updates yesterday and now my external RAID Volume no longer shows in Windows Vista x64. All updates went through successfully. From their description, I cannot see how they should relate to the issue, but this is the only change that happened, so who knows. Anyway, here is the details: I have an external eSata enclosure that is running on a SiI4726 controller. I can connect to the controller with it's management utility from the computer the enclosure is connected to. The three drives in the enclosure show up as JBODs. I had those drives configured to be one logical RAID5 drive. RAID management is done through a SiI3132 SoftRaid controller. The Raid Management Utility just shows empty channels where it usually shows the Raid Group. In the Windows Disk Manager, I can see an unknown unitialized device. This is fine according to the setup manual. What it doesn't show is my Raid drive. It's gone. Also, when booting Windows, the BIOS of the controller used to show the RAID volume before booting the OS. This is not happening anymore. Updating drivers and firmware did not help. I have made sure the drivers and firmware are compatible to each others. And like I said, it used to work before. Any clues?

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  • Oracle Launches Enterprise Manager Ops Center 12c at OpenWorld Japan

    - by Anand Akela
    Oracle Senior Vice President John Fowler and Oracle Vice President of Systems Management Steve Wilson unveiled Oracle Enterprise Manager Ops Center 12c at Oracle OpenWorld, Tokyo Japan on April 4th morning.  Oracle Enterprise Manager combines management of servers, operating systems, virtualization solution for x86 and SPRC servers, firmware, storage, and network fabrics with Oracle Enterprise Manager Ops Center. Available at no additional cost as part of the Ops Center Anywhere Program, Oracle Enterprise Manager Ops Center 12c allows enterprises to accelerate mission-critical cloud deployment, unleash the power of Solaris 11 — the first cloud OS, and simplify Oracle engineered systems management. Here are some of the resources for you to learn more about the new Oracle Enterprise Manager Ops Center 12c :  Press Release : Introducing Oracle Enterprise Manager Ops Center 12c White paper: Oracle Enterprise Manager Ops Center 12c - Making Infrastructure-as-a-Service in the Enterprise a Reality Oracle Enterprise Manager Ops Center web page at Oracle Technology Network Join Oracle Launch Webcast : Total Cloud Control for Systems on April 12th at 9 AM PST to learn more about  Oracle Enterprise Manager Ops Center 12c from Oracle Senior Vice President John Fowler, Oracle Vice President of Systems Management Steve Wilson and a panel of Oracle executive. Stay connected with  Oracle Enterprise Manager   :  Twitter | Facebook | YouTube | Linkedin | Newsletter

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  • links for 2010-03-18

    - by Bob Rhubart
    Oracle Database HA Architecture « The Oracle Instructor Oracle Certified Master Uwe Hesse introduces his blog's new Oracle Database HA Architecture page. (tags: oracle otn highavailability database) Mario Morgado: Where is the value of Enterprise Architecture? "When we purchase a product, its value is equivalent to the maximum amount that someone is willing to pay for the product. However, is the same equation valid in terms of the business value of enterprise architecture?" Mario Morgado (tags: otn oracle enterprisearchitecture) Steve Wilson: Managing Application to Disk "Of course, what we're introducing today goes beyond a mere re-skinning of Sun Ops Center. The promise is to offer real integration, and now we're delivering on the first phase in that roadmap by introducing the Oracle Management Connector for Ops Center. This software allows customers to connect an instance of Ops Center to an instance of Oracle Enterprise Manager's grid control server and connect the event streams of the two products, allowing for new levels of visibility into the customer's systems when using the combination of Oracle and Sun technology." "Virtual" Steve Wilson (tags: oraclesun opscenter)

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  • Your thoughts on Best Practices for Scientific Computing?

    - by John Smith
    A recent paper by Wilson et al (2014) pointed out 24 Best Practices for scientific programming. It's worth to have a look. I would like to hear opinions about these points from experienced programmers in scientific data analysis. Do you think these advices are helpful and practical? Or are they good only in an ideal world? Wilson G, Aruliah DA, Brown CT, Chue Hong NP, Davis M, Guy RT, Haddock SHD, Huff KD, Mitchell IM, Plumbley MD, Waugh B, White EP, Wilson P (2014) Best Practices for Scientific Computing. PLoS Biol 12:e1001745. http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.1001745 Box 1. Summary of Best Practices Write programs for people, not computers. (a) A program should not require its readers to hold more than a handful of facts in memory at once. (b) Make names consistent, distinctive, and meaningful. (c) Make code style and formatting consistent. Let the computer do the work. (a) Make the computer repeat tasks. (b) Save recent commands in a file for re-use. (c) Use a build tool to automate workflows. Make incremental changes. (a) Work in small steps with frequent feedback and course correction. (b) Use a version control system. (c) Put everything that has been created manually in version control. Don’t repeat yourself (or others). (a) Every piece of data must have a single authoritative representation in the system. (b) Modularize code rather than copying and pasting. (c) Re-use code instead of rewriting it. Plan for mistakes. (a) Add assertions to programs to check their operation. (b) Use an off-the-shelf unit testing library. (c) Turn bugs into test cases. (d) Use a symbolic debugger. Optimize software only after it works correctly. (a) Use a profiler to identify bottlenecks. (b) Write code in the highest-level language possible. Document design and purpose, not mechanics. (a) Document interfaces and reasons, not implementations. (b) Refactor code in preference to explaining how it works. (c) Embed the documentation for a piece of software in that software. Collaborate. (a) Use pre-merge code reviews. (b) Use pair programming when bringing someone new up to speed and when tackling particularly tricky problems. (c) Use an issue tracking tool. I'm relatively new to serious programming for scientific data analysis. When I tried to write code for pilot analyses of some of my data last year, I encountered tremendous amount of bugs both in my code and data. Bugs and errors had been around me all the time, but this time it was somewhat overwhelming. I managed to crunch the numbers at last, but I thought I couldn't put up with this mess any longer. Some actions must be taken. Without a sophisticated guide like the article above, I started to adopt "defensive style" of programming since then. A book titled "The Art of Readable Code" helped me a lot. I deployed meticulous input validations or assertions for every function, renamed a lot of variables and functions for better readability, and extracted many subroutines as reusable functions. Recently, I introduced Git and SourceTree for version control. At the moment, because my co-workers are much more reluctant about these issues, the collaboration practices (8a,b,c) have not been introduced. Actually, as the authors admitted, because all of these practices take some amount of time and effort to introduce, it may be generally hard to persuade your reluctant collaborators to comply them. I think I'm asking your opinions because I still suffer from many bugs despite all my effort on many of these practices. Bug fix may be, or should be, faster than before, but I couldn't really measure the improvement. Moreover, much of my time has been invested on defence, meaning that I haven't actually done much data analysis (offence) these days. Where is the point I should stop at in terms of productivity? I've already deployed: 1a,b,c, 2a, 3a,b,c, 4b,c, 5a,d, 6a,b, 7a,7b I'm about to have a go at: 5b,c Not yet: 2b,c, 4a, 7c, 8a,b,c (I could not really see the advantage of using GNU make (2c) for my purpose. Could anyone tell me how it helps my work with MATLAB?)

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  • DNS Query.log - Multiple query’s for ripe.net

    - by Christopher Wilson
    Currently I run a DNS server (bind9) that handles queries from clients over the internet lately I have noticed hundreds of queries from all different address's that look like this (Server IP removed) client 216.59.33.210#53: query: ripe.net IN ANY +ED (0.0.0.0) client 216.59.33.204#53: query: ripe.net IN ANY +ED (0.0.0.0) client 208.64.127.5#53: query: ripe.net IN ANY +ED (0.0.0.0) client 184.107.255.202#53: query: ripe.net IN ANY +ED (0.0.0.0) client 208.64.127.5#53: query: ripe.net IN ANY +ED (0.0.0.0) client 208.64.127.5#53: query: ripe.net IN ANY +ED (0.0.0.0) client 205.204.65.83#53: query: ripe.net IN ANY +ED (0.0.0.0) client 69.162.110.106#53: query: ripe.net IN ANY +ED (0.0.0.0) client 216.59.33.210#53: query: ripe.net IN ANY +ED (0.0.0.0) client 69.162.110.106#53: query: ripe.net IN ANY +ED (0.0.0.0) client 216.59.33.204#53: query: ripe.net IN ANY +ED (0.0.0.0) client 208.64.127.5#53: query: ripe.net IN ANY +ED (0.0.0.0) Can someone please explain why there are so many clients querying for ripe.net ?

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  • Upgrade OpenSSL 0.9.8k to OpenSSL 1.0.1c on Ubuntu 10.04

    - by Nina
    We're currently using Ubuntu 10.04 and based on the PCI Compliance results, we're told to upgrade our OpenSSL. I attempted to do this using this reference: http://sandilands.info/sgordon/upgrade-latest-version-openssl-on-ubuntu and http://www.lunarforums.com/dedicated_web_hosting_at_lunarpages/upgrading_openssl-t35015.0.html Unfortunately, they didn't work for me. And when I attempted to remove the old version prior to installation, it looks like it broke a few thins in the system. The article from Steve Gordon seemed like it would work for me, but when I ran the openssl version command, it still read that it was the old version. I was wondering if anyone has any suggestions on what I should do. Fix: After following the steps from Steven Gordon, make sure you restart apache and / or restart your computer (I did both, but I'm sure a simple restart will fix it right up).

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  • URL Rewrite in WebLogic 11g

    - by A. Wilson
    I have a client running a WebLogic 11g install on a Windows Server machine who wishes to implement Apache-style mod_rewrite-like functionality to translate requests for easyurl.com to super.complicated.com/with/this/junk?here=and_more. I have scoured the Internet for advice, but all I can find are other people who are asking the same question and not getting any answer. Assuming that installing 3rd-party apps is not an option, how do I implement this in WebLogic? To clarify, WebLogic is not running with Apache (or else I'd just use mod_rewrite).

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  • VMware ARP/Mac Networking

    - by Ross Wilson
    Hi Guys, I am very interested in how VMware networking works. I have scoured the VMware website and read their data sheets, this has given me some basic knowledge. I now have some questions. Lets assume that we have a physical server running the VMware hypervisor. The physical server is running a Virtual Machine. The physical box has one physical NIC. The NIC is connected to a switch, as so is a desktop client. Now, this is where my first question lies. The VM has an IP address: 192.168.1.1. How do desktop clients on the network communicate with this VM? So, the client pings 192.168.1.1. The ping packet is sent to the switch. The switch checks its MAC address table and sees that 192.168.1.1 is associated with the MAC address of the physical NIC. Correct? I then assume that the ping packet is sent to the server's physical NIC, where the hypervisor routes the packet to the VM thats using 192.168.1.1? Please could you give me a run down as to how VM networking works? Many thanks, Ross

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  • Google Chrome not loading web pages correctly unless multiple refreshes

    - by Brandon Wilson
    Webpages in Google Chrome do not load correctly from time to time. I can't reproduce it, it just happens. Some times it happens when I load the browser other times it happens when I am just browsing. Just now I went to five different web sites which 3 out of 5 of them did not load correctly. I have attached a photo of how Super User loaded the first time I loaded it. If I refreshed it it will load correctly. Facebook is bad like this. Some times Facebook will load correctly but some of there back end scripting may not load so the page may not refresh automatically. Not sure what is going on. I have tried other browsers (Firefox and Internet Explorer) and they seem to be working correctly. Chrome seems to be acting up only on this computer. All my computers are running Windows 8 and I have removed Chrome completely off this computer and re-installed. I even disabled all extensions and cleared all the caches. I even tried running Chrome without being logged in. Not sure what else to do at this point. An example of superuser.com not loading correctly: When I refresh the problem will go away until it happens again. Sometimes it takes two or three refreshes in order for it to correctly load.

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  • Incremental backups from Rackspace Cloud Files to Amazon Glacier

    - by Martin Wilson
    Is there a software product/module (open-source or commercial) that can provide incremental backups from Rackspace Cloud Files to Amazon Glacier? We are looking for something that will provide the following functionality (or achieve the same result, i.e. a cost-effective backup strategy for files stored in Rackspace Cloud Files): Work out which files have been added to or modified in a Rackspace Cloud account (since the last backup). Create a ZIP (or similar) of these files and store them in Amazon Glacier. Keep a record of which files are in which ZIPs. Ideally, restore either a single file or all files from Glacier back into Rackspace.

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  • Sound stopped working on Toshiba Satelite C855

    - by Eric Wilson
    I have a Toshiba Satallite C855 running Windows 7 with a Realtek High Definition Audio card. Sound worked fine yesterday. Today, my two-year old did something to the machine, and I have no sound. I have adjusted sound through the icon in the lower right corner, and using the Fn keys. I have rebooted. I've verified that there are no external speakers plugged in to the laptop. It seems that this model does not have an external volume control. (If it does I can't find it.) Any ideas?

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  • Can't install LibreOffice on Windows 7

    - by Eric Wilson
    I've just downloaded LibreOffice 4.1.3 (twice) on a newly refurbished Windows 7 Thinkpad. When I click the .msi to install, I get "This installation package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer package" How do I obtain a usable copy of LibreOffice for Windows? I also tried 4.1.2 and 4.0.6 also, after 4.1.3 failed. 4.1.2 started fine, but encountered an error and failed to install. 4.0.6 fails in the same way as 4.1.3. I have used 7-zip to test the 4.1.3 msi, and it is unable to open it ...

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  • Separating user resources - Windows Server 2008 (Terminal Server)

    - by Christopher Wilson
    At the moment I am running a Windows Terminal Server 2008 for around 10 clients that use the server to run programs and access data. Is there anyway to separate the resources of each user so that they do not impact each other in terms of resources. User 1: Opens program User 2: Notices slow down I have looked into using Windows System Resource Manager but do not know if it provides what I need and if there are any other 3rd party tools that also provide this functionality. Any answer is appreciated. Server Specs: HP ProLiant ML110 G7 Processor: Intel® Xeon® E3-1220 (4 core, 3.1 GHz, 8MB, 80W, 1333/t) RAM: 12GB DDR3 ECC 1TB HDD

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  • E-mail addresses with plus sign in MS Exchange

    - by Wilson
    Many users like to use e-mail address in the format "[user]+[tag]@[domain]" to facilitate local filtering of incoming messages. The semantics of that is that the message should be delivered to the mailbox belonging to "user"; the user would advertise his/her address with different tags to different potential senders and would then be able to filter incoming messages according to sender (and also to track who got the e-mail address from where). The question is: is it possible to get MS Exchange (2007) to deliver messages in this format properly? If so, how exactly? Internet searches seem to imply it is not a possibility...

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