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  • What technologies are needed to be a freelance web developer / designer targeting small businesses?

    - by Jason Wirth
    First off, I'm not looking for this answer: "learn PHP/MySQL, JQuery, HTML/CSS...." My background, I wear many hats, and do many things. Currently I manage investment accounts with a business partner who is also a friend. He happens to be attending business / law school perusing a joint JD and MBA. As a result, we're putting our into "coast", maintaining our current clients, but not acquiring more. Recently I've picked up some freelance graphic design / web development / online marketing side work (Photoshop, HTML/CSS, WordPress) through some personal networks. The work is enjoyable; now I'm thinking about expanding it into a larger business with these primary goals: augment my finances (I'm shooting for about $1,000-2,000 per mo.), learn new technologies, involve myself with meaningful work. As an entrepreneur I don't mind the aspects of running a business that hassle other freelancers... -- the marketing -- the billing -- etc. I'm considering targeting the small to middle market businesses and organizations where I can contribute in marketing, design, and development building projects from the ground up. Thus I'll have freedom to decide the specific technology (I won't have to work with an existing code base). What kinds of projects should I focus on? What technologies are a good fit for this style of work? For example: It might be fun to develop with Ruby on Rails. However, maybe a lot of projects would be rolling out e-commerce solutions. Thus, I should focus on PHP due to more shopping cart options, skipping ROR entirely.

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  • In C and C++, what methods can prevent accidental use of the assignment(=) where equivalence(==) is needed?

    - by DeveloperDon
    In C and C++, it is very easy to write the following code with a serious error. char responseChar = getchar(); int confirmExit = 'y' == tolower(responseChar); if (confirmExit = 1) { exit(0); } The error is that the if statement should have been: if (confirmExit == 1) As coded, it will exit every time, because the assignment of the confirmExit variable occurs, then confirmExit is used as the result of the expression. Are there good ways to prevent this kind of error?

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  • Raid superblock missing on single parition. Recovery needed!

    - by user171639
    Ok so I have a 2 TB raid 1 setup that has three partitions: sdc1: linux sdc2: swap sdc3: LVM for data However the LVM will no longer mount. So I thought that I would take the first drive, mount it in linux (ive done this b4), and reset the spare drive to copy the data. Normally I can mount a single drive for data recovery using: sudo su apt-get install mdadm lvm2 mdadm --assemble --scan modprobe dm-mod vgscan vgchange -ay c mount -o ro /dev/c/c /mnt Unfortunately, vgscan doesnot recognize the data partition. It appears as though the superblock on the first drive's data partition was erased while syncing with the second. So now I cannot mount that partition and the second drive is stuck in spare mode. Any ideas? Or a way to force mount the data partition just to copy the data? knoppix@Microknoppix:~$ sudo su root@Microknoppix:/home/knoppix# apt-get install mdadm lvm2 Reading package lists... Done Building dependency tree Reading state information... Done lvm2 is already the newest version. mdadm is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 551 not upgraded. root@Microknoppix:/home/knoppix# mdadm --assemble --scan mdadm: /dev/md/1 has been started with 1 drive (out of 2). mdadm: /dev/md/0 has been started with 1 drive (out of 2). root@Microknoppix:/home/knoppix# modprobe dm-mod root@Microknoppix:/home/knoppix# vgscan Reading all physical volumes. This may take a while... No volume groups found root@Microknoppix:/home/knoppix# cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdc1[2] 4193268 blocks super 1.2 [2/1] [U_] md1 : active raid1 sdc2[2] 524276 blocks super 1.2 [2/1] [U_] unused devices: <none> root@Microknoppix:/home/knoppix# mdadm -v --assemble --auto=yes /dev/md2 /dev/sdc3 mdadm: looking for devices for /dev/md2 mdadm: no recogniseable superblock on /dev/sdc3 mdadm: /dev/sdc3 has no superblock - assembly aborted root@Microknoppix:/home/knoppix# dumpe2fs /dev/md0 | grep -i superblock dumpe2fs 1.42.4 (12-Jun-2012) Primary superblock at 0, Group descriptors at 1-1 Backup superblock at 32768, Group descriptors at 32769-32769 Backup superblock at 98304, Group descriptors at 98305-98305 Backup superblock at 163840, Group descriptors at 163841-163841 Backup superblock at 229376, Group descriptors at 229377-229377 Backup superblock at 294912, Group descriptors at 294913-294913 Backup superblock at 819200, Group descriptors at 819201-819201 Backup superblock at 884736, Group descriptors at 884737-884737 root@Microknoppix:/home/knoppix# Notes: I can read the super block from the spare drive. I was gonna try and restore the superblock from one of the backups, but i dont know how or if this would work. I also heard creating a new array (mdadm --create) using the same parameters will not delete the data on the drive but i didnt want to risk it. Recommendations?

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  • Java or Python? Career/Start-up advice needed [closed]

    - by vim
    I have a full-time PHP job and I've been working with PHP for 5 years. As you can guess after spending 5 years I'm not willing to stay within this technology stack any more. I also worked with Java for 2 year before, so for me it looks more obvious to switch back to Java. However during last 5 years I was thinking about starting my own project, and now I think I have a very good SAAS idea. I'm completely confused what technology should I use for my project. I don't want to do it in PHP, and after reading many articles about rapid prototype development it seems to me that Django/Ruby is the best option. I will continue to work full time for my current employer because I need to pay my bills and will work on my project in my free time. The concern I have is should I do my project in Java or Python? To be realistic there is always a risk when you are doing your own project/start-up. If I do it in Java in the worst case scenario I believe I will be able to find a full time Java position because I already have some experience in Java + recent experience in my project. With regards to Python it looks like it is not very popular in my area and salaries are much more lower then for Java. On the other hand I have a feeling that if I chose Java it will take me a way longer to finish my project. Guys I'm completely confused and I need your advice. P.S. I have moved to London 2 years ago from another country, local guys are very welcome to share their thoughts about London's job market.

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  • Certifications needed to get an interview with no experience and no degree. [closed]

    - by Joel Cornett
    Possible Duplicate: Are certifications worth it? Given that I have no commercial experience to speak of -- and no undergraduate degree -- how can I best demonstrate my programming ability in order to interview for a job? How valuable are the various software certifications? Should I get the OCA? Should I submit samples of my code? Are there some other skills that I should develop? (I picked up Python and Java fairly quickly--a matter of weeks, actually.) I am a undergrad working on a triple major in math, stat and econ. I consider myself proficient with Python and have a working knowledge of Java.

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  • What is needed to become a skillful and professional software developer ?

    - by silentbang
    I am interested in studying algorithms and my strong points are problem-solving and logical thinking. However what I am guided toward is web-developing languages, SQL and they seem to not exploit the best out of me. I think it's because lots of people can learn these things easily, even steal ideas and copy code. Is that wrong? I was told that "learning algorithms is just for optimization, so you just need to know it (not a deep understanding)", but I think algorithms are my savior; it differentiates one man's abilities from others'. Also I'm learning C++ to benefit my future career. Many people say that web developer is a future trend, which worries me. I don't know what I need to standout in my career, and should I balance between web and software developing or just one? Should I work hard on algorithms?

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  • In subform of a MS Access form, how to hide/show the vertical scroll bars as needed?

    - by PowerUser
    I have a subform in an MS Access form which is not hiding/showing the vertical scroll bars as needed. In the example picture, the vertical scroll bar is showing even though there aren't enough records to warrant vertical scrolling. How do I get the scroll bars to show only when they are needed? Do I need to add an if-then condition to the on_load event? or is there an easier option?

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  • Is O_LARGEFILE needed just to write a large file?

    - by Daniel Trebbien
    Is the O_LARGEFILE flag needed if all that I want to do is write a large file (O_WRONLY) or append to a large file (O_APPEND | O_WRONLY)? From a thread that I read titled "Cannot write 2gb index file" on the CLucene-dev mailing list, it appears that O_LARGEFILE might be needed to write large files, but participants in that discussion are using O_RDWR, not O_WRONLY, so I am not sure.

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  • Installing Zend on CentOS is having dependency issues

    - by rax
    I'm trying to install PHP's Zend Server on my CentOS VPS but it's having dependency issues that I can't seem to resolve. zend-server-php-5.2-4.0-73.noarch from Zend_noarch has depsolving problems --> Missing Dependency: php-5.2-gui-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) zend-server-php-5.2-4.0-73.noarch from Zend_noarch has depsolving problems --> Missing Dependency: php-5.2-dev-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) knowledgetree-ce-3.7.0-2.noarch from KTnoarch has depsolving problems --> Missing Dependency: php-5.2-xmlrpc-zend-server is needed by package knowledgetree-ce-3.7.0-2.noarch (KTnoarch) knowledgetree-ce-3.7.0-2.noarch from KTnoarch has depsolving problems --> Missing Dependency: php-5.2-fileinfo-zend-server is needed by package knowledgetree-ce-3.7.0-2.noarch (KTnoarch) zend-server-php-5.2-4.0-73.noarch from Zend_noarch has depsolving problems --> Missing Dependency: php-5.2-zend-extensions is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) zend-server-php-5.2-4.0-73.noarch from Zend_noarch has depsolving problems --> Missing Dependency: php-5.2-common-extensions-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) Error: Missing Dependency: php-5.2-fileinfo-zend-server is needed by package knowledgetree-ce-3.7.0-2.noarch (KTnoarch) Error: Missing Dependency: php-5.2-xmlrpc-zend-server is needed by package knowledgetree-ce-3.7.0-2.noarch (KTnoarch) Error: Missing Dependency: php-5.2-gui-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) Error: Missing Dependency: php-5.2-common-extensions-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) Error: Missing Dependency: php-5.2-dev-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) Error: Missing Dependency: php-5.2-zend-extensions is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) When consulting the Google, all I get told is how to install PHP 5.2.* on CentOS. According to the output of php -v, I've done that. PHP 5.2.8 (cli) (built: Sep 28 2009 15:37:15) Copyright (c) 1997-2008 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies with the ionCube PHP Loader v3.1.34, Copyright (c) 2002-2009, by ionCube Ltd. How can I solve this issue?

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  • linux nooB: Installing ffmpeg + dependencies on aws linux ami (repo issues)

    - by HdN8
    Im installing ffmpeg to run on an amazon linux ami, and have added the rpmforge repo and the dag repo. Here are some guidelines I'm using for reference: TWoZaO and Razuna The rpmforge repo has ffmpeg, but if you try to install it then it will complain that is missing dependencies (for me libSDL-1.2.so.0()(64bit)). Regardless I will install ffmpeg from svn so I can be sure to enable the options I want (namely libx264). It seems strange to me though that SDL is not in rpmforge or dag, and in according to both of my references above, it should be there. I tried to grab it manually from here, but it needs these dependencies, so no-go: error: Failed dependencies: SDL = 1.2.10-8.el5 is needed by SDL-devel-1.2.10-8.el5.x86_64 alsa-lib-devel is needed by SDL-devel-1.2.10-8.el5.x86_64 libGL-devel is needed by SDL-devel-1.2.10-8.el5.x86_64 libGLU-devel is needed by SDL-devel-1.2.10-8.el5.x86_64 libSDL-1.2.so.0()(64bit) is needed by SDL-devel-1.2.10-8.el5.x86_64 libX11-devel is needed by SDL-devel-1.2.10-8.el5.x86_64 libXext-devel is needed by SDL-devel-1.2.10-8.el5.x86_64 libXrandr-devel is needed by SDL-devel-1.2.10-8.el5.x86_64 libXrender-devel is needed by SDL-devel-1.2.10-8.el5.x86_64 libXt-devel is needed by SDL-devel-1.2.10-8.el5.x86_64 Any advice for a linux nooB lost in a mess of repos and dependency errors?

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  • Installing Zend on CentOS is having dependency issues

    - by rax
    I'm trying to install PHP's Zend Server on my CentOS VPS but it's having dependency issues that I can't seem to resolve. zend-server-php-5.2-4.0-73.noarch from Zend_noarch has depsolving problems --> Missing Dependency: php-5.2-gui-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) zend-server-php-5.2-4.0-73.noarch from Zend_noarch has depsolving problems --> Missing Dependency: php-5.2-dev-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) knowledgetree-ce-3.7.0-2.noarch from KTnoarch has depsolving problems --> Missing Dependency: php-5.2-xmlrpc-zend-server is needed by package knowledgetree-ce-3.7.0-2.noarch (KTnoarch) knowledgetree-ce-3.7.0-2.noarch from KTnoarch has depsolving problems --> Missing Dependency: php-5.2-fileinfo-zend-server is needed by package knowledgetree-ce-3.7.0-2.noarch (KTnoarch) zend-server-php-5.2-4.0-73.noarch from Zend_noarch has depsolving problems --> Missing Dependency: php-5.2-zend-extensions is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) zend-server-php-5.2-4.0-73.noarch from Zend_noarch has depsolving problems --> Missing Dependency: php-5.2-common-extensions-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) Error: Missing Dependency: php-5.2-fileinfo-zend-server is needed by package knowledgetree-ce-3.7.0-2.noarch (KTnoarch) Error: Missing Dependency: php-5.2-xmlrpc-zend-server is needed by package knowledgetree-ce-3.7.0-2.noarch (KTnoarch) Error: Missing Dependency: php-5.2-gui-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) Error: Missing Dependency: php-5.2-common-extensions-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) Error: Missing Dependency: php-5.2-dev-zend-server is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) Error: Missing Dependency: php-5.2-zend-extensions is needed by package zend-server-php-5.2-4.0-73.noarch (Zend_noarch) When consulting the Google, all I get told is how to install PHP 5.2.* on CentOS. According to the output of php -v, I've done that. PHP 5.2.8 (cli) (built: Sep 28 2009 15:37:15) Copyright (c) 1997-2008 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies with the ionCube PHP Loader v3.1.34, Copyright (c) 2002-2009, by ionCube Ltd. How can I solve this issue?

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  • What "pieces" are needed in order to set up a cluster of physical servers?

    - by Chris Dutrow
    Background: Currently, we use Rackspace cloud servers. We have no intention to stop using them, but would like to look into setting up a cluster of physical servers (probably desktop computers in the $400 range with 8gb memory each) to offset some of our load and work as a secondary, more powerful, less reliable system. To put things in perspective, we can buy comparable desktop computers for the same price as we pay in one month to rent them on Rackspace Cloud. I understand that this is generally a dumb idea. However, in this particular instance, the server cluster is needed for its computation power. It is not mission-critical, it does not host a consumer-facing website, and if it goes down for a day or two, its not really a problem. Currently, we have access to business class verizon fios. If I understand correctly, we can get at least 25 dedicated IP addresses with this service, this should be enough. Requirements: Each server runs Linux Centos 6.3 Some of the servers run Python and execute processes from a task queue (Redis or RabbitMQ) Some of the servers are capable of serving static files and Python driven REST APIs Some of the servers host a Cassandra database cluster One or more of the servers are a Redis database servers One or more of the servers are PostgreSQL servers Questions: What kind of router or switch is needed? We would like the computers to be able to communicate effectively with each other via internal IP addresses. This is especially important for communicating with servers hosting Redis that need to be able to respond to requests very quickly. Are there special switches or routers that need to be used to connect the servers together? Are Desktop computers ok for this? We have found that we are mostly RAM-bottle necked, I understand that some servers have highly superior CPUs, but I'm not sure we need CPU power as much as we need RAM, which is cheap in Desktop computers. Will we have problems with the WIFI cards in the desktops or any other unexpected hardware limitation? What tools should be used to "image" the servers. For example, when we get an installation right for a Redis server or Cassandra node, are there tools that come with Linux Centos 6.3 to image the server to a USB drive or something like that? Or do we need to use some other software for this? What other things are we missing that we should be concerned about? Thanks so much!

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  • Hard Drives: Always on or spin up/down as needed?

    - by Terminal Frost
    The specific application is a NAS that hosts media content and is frequently accessed during the day. My NAS was probably cycling on and off around 5 times a day so I decided to not allow it to spin down. I'm thinking this will be better for the drive, but I am not sure. I am wondering, however, if there is any concrete information out there as to what causes more detrimental wear on a hard disk: Spinning 24/7 or cycling on and off as needed?

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  • Installing ffmpeg + dependencies on AWS Linux AMI (repo issues)

    - by HdN8
    I'm installing ffmpeg to run on an Amazon linux AMI, and have added the rpmforge repo and the dag repo. Here are some guidelines I'm using for reference: TWoZaO and Razuna The rpmforge repo has ffmpeg, but if you try to install it then it will complain that is missing dependencies (for me libSDL-1.2.so.0()(64bit)). Regardless I will install ffmpeg from svn so I can be sure to enable the options I want (namelylibx264). It seems strange to me though that SDL is not inrpmforgeordag`, and in according to both of my references above, it should be there. I tried to grab it manually from here, but it needs these dependencies, so no-go: > error: Failed dependencies: SDL = > 1.2.10-8.el5 is needed by SDL-devel-1.2.10-8.el5.x86_64 > alsa-lib-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libGL-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libGLU-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libSDL-1.2.so.0()(64bit) is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libX11-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libXext-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libXrandr-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libXrender-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libXt-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64

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  • Installing ffmpeg + dependencies on AWS Linux AMI (repo issues)

    - by HdN8
    I'm installing ffmpeg to run on an Amazon linux AMI, and have added the rpmforge repo and the dag repo. Here are some guidelines I'm using for reference: TWoZaO and Razuna The rpmforge repo has ffmpeg, but if you try to install it then it will complain that is missing dependencies (for me libSDL-1.2.so.0()(64bit)). Regardless I will install ffmpeg from svn so I can be sure to enable the options I want (namelylibx264). It seems strange to me though that SDL is not inrpmforgeordag`, and in according to both of my references above, it should be there. I tried to grab it manually from here, but it needs these dependencies, so no-go: > error: Failed dependencies: SDL = > 1.2.10-8.el5 is needed by SDL-devel-1.2.10-8.el5.x86_64 > alsa-lib-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libGL-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libGLU-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libSDL-1.2.so.0()(64bit) is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libX11-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libXext-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libXrandr-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libXrender-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64 > libXt-devel is needed by > SDL-devel-1.2.10-8.el5.x86_64

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  • subversion instillation on centos 5.8

    - by user57221
    I am trying to install subversion on centos 5.8 usingyum install subversion and it is throwing the error below. ..... .... Total size: 7.3 M Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug ERROR with rpm_check_debug vs depsolve: libapr-1.so.0()(64bit) is needed by subversion-1.6.11-10.el5_8.x86_64 libaprutil-1.so.0()(64bit) is needed by subversion-1.6.11-10.el5_8.x86_64 libapr-1.so.0()(64bit) is needed by (installed) mod_perl-2.0.4-6.el5.x86_64 apr is needed by (installed) httpd-2.2.22-12051516.x86_64 /usr/lib64/libapr-1.so.0 is needed by (installed) httpd-2.2.22-12051516.x86_64 libaprutil-1.so.0()(64bit) is needed by (installed) mod_perl-2.0.4-6.el5.x86_64 apr-util is needed by (installed) httpd-2.2.22-12051516.x86_64 /usr/lib64/libaprutil-1.so.0 is needed by (installed) httpd-2.2.22-12051516.x86_64 Complete! (1, [u'Please report this error in http://bugs.centos.org/yum5bug']) How do i resolve this?

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  • Creating multiple csv files from data within a csv file.

    - by S1syphus
    System OSX or Linux I'm trying to automate my work flow at work, each week I receive an excel file, which I convert to a csv. An example is: ,,L1,,,L2,,,L3,,,L4,,,L5,,,L6,,,L7,,,L8,,,L9,,,L10,,,L11, Title,r/t,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,neede d,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst,needed,actual,Inst EXAMPLEfoo,60,6,6,6,0,0,0,0,0,0,6,6,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 EXAMPLEbar,30,6,6,12,6,7,14,6,6,12,6,6,12,6,8,16,6,7,14,6,7.5,15,6,6,12,6,8,16,6,0,0,6,7,14 EXAMPLE1,60,3,3,3,3,5,5,3,4,4,3,3,3,3,6,6,3,4,4,3,3,3,3,4,4,3,8,8,3,0,0,3,4,4 EXAMPLE2,120,6,6,3,0,0,0,6,8,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 EXAMPLE3,60,6,6,6,6,8,8,6,6,6,6,6,6,0,0,0,0,0,0,6,8,8,6,6,6,0,0,0,0,0,0,0,10,10 EXAMPLE4,30,6,6,12,6,7,14,6,6,12,6,6,12,3,5.5,11,6,7.5,15,6,6,12,6,0,0,6,9,18,6,0,0,6,6.5,13 And so you can get a picture of how it looks in excel: What I need to do, is create multiple csv files for each instance in row 1, so L1, L2, L3, L4... And within that each csv file it needs to contain the title, r/t, needed So for L1 an example out put would look like: EXAMPLEfoo,60,6 EXAMPLEbar,30,6 EXAMPLE1,60,3 EXAMPLE2,120,6 EXAMPLE3,60,6 EXAMPLE4,30,6 And for L2: EXAMPLEfoo,60,0 EXAMPLEbar,30,6 EXAMPLE1,60,3 EXAMPLE2,120,0 EXAMPLE3,60,6 EXAMPLE4,30,6 And so on. I have tried playing around with sed and awk and hit google but I have found nothing that really solves the issue. I'd imagine perl would be particular suited to this or maybe python, so I would be more than happy to accept suggestions from users. So, any suggestions? Thanks in advance.

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  • What else is needed to get iptables to log into this file I created?

    - by anthony01
    I want to create the logging of iptables DROP's and intrusion attemps. First, I put --log-prefix "iptables: " at the end of every iptables rules in my iptables rules file. But this doesn't work, as it says there is a syntax error. So where should I put that command? (I would want to have it included in the saved rules file) Secondly, I created a file iptables.conf within /etc/rsyslog.d/, and I put the following inside of it: :msg, startswith, "iptables: " -/var/log/iptables.log & ~ I assume that at this stage, I'm supposed to restart the rsyslog daemon. What else is needed to do what I'm attempting? Thanks a lot

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  • A space-efficient guest filesystem for grow-as-needed virtual disks ?

    - by Steve Schnepp
    A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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  • How would I measure the amount of RAM needed per Glassfish domain? [closed]

    - by oligofren
    Possible Duplicate: Can you help me with my capacity planning? In our test environment we have a lot of apps spread out over a few servers and Glassfish domains. To make versioning easier I would have liked to have one Glassfish domain per customer per app (kind of like a heavyweight version of lots of jetty instances). But I have heard that Glassfish is kind of heavy on the resources, and so I would need to measure approximately how many instances would fit in the available RAM. These are low-traffic/low load testing servers, so CPU is not really an issue, though RAM might be. How would I get an approximate measure of how much RAM is needed? This is one Glassfish 3 instance with one heavy EAR application deployed. top? jvmstats? ??

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  • No rule to make target libmysql.c', needed bylibmysql.lo'. Stop

    - by user1711008
    I install mysql5.1.53, run #./configure is well, but run #make have this error. My system is centos5.8, gcc version 4.1.2 20080704 (Red Hat 4.1.2-52) make[2]: Leaving directory /root/soft/mysql-5.1.53/libmysql' make[1]: Leaving directory/root/soft/mysql-5.1.53/libmysql' Making all in libmysql_r make[1]: Entering directory /root/soft/mysql-5.1.53/libmysql_r' make all-am make[2]: Entering directory/root/soft/mysql-5.1.53/libmysql_r' make[2]: * No rule to make target libmysql.c', needed bylibmysql.lo'. Stop. make[2]: Leaving directory /root/soft/mysql-5.1.53/libmysql_r' make[1]: *** [all] Error 2 make[1]: Leaving directory/root/soft/mysql-5.1.53/libmysql_r' make: * [all-recursive] Error 1

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  • A space-efficient filesystem for grow-as-needed virtual disks ?

    - by Steve Schnepp
    A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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  • g++ symbol versioning. Set it to GCC_3.0 using version 4 of g++

    - by Ismael
    Hi all I need to implemente a Java class which uses JNI to control a fiscal printer in XUbuntu 8.10 with sun-java6-jdk installed. The structure is the following: EpsonDriver.java loads libEpson.so libEpson is linked dynamically with EpsonFiscalProtocol.so ( provided by Epson, no source available ) and pthread I use javah to generate the header file, and the code compiles. Then I put the libEpson.so in $JAVA_HOME/jre/lib/i386, and EpsonDriver.java uses an static initializar System.loadLibrary("libEpson") That part works, however, when I try to use any of the methods I get an unsatisfiedLinkError exception. Some time ago, a coworker did a version that works, and using objdump -Dslx I got the following: Program Header: LOAD off 0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**12 filesz 0x0000ccc4 memsz 0x0000ccc4 flags r-x LOAD off 0x0000d000 vaddr 0x0000d000 paddr 0x0000d000 align 2**12 filesz 0x00000250 memsz 0x00044a5c flags rw- DYNAMIC off 0x0000d014 vaddr 0x0000d014 paddr 0x0000d014 align 2**2 filesz 0x000000f0 memsz 0x000000f0 flags rw- NOTE off 0x000000d4 vaddr 0x000000d4 paddr 0x000000d4 align 2**2 filesz 0x00000024 memsz 0x00000024 flags r-- STACK off 0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**2 filesz 0x00000000 memsz 0x00000000 flags rw- Dynamic Section: NEEDED EpsonFiscalProtocol.so NEEDED libpthread.so.0 NEEDED libstdc++.so.6 NEEDED libm.so.6 NEEDED libc.so.6 SONAME libcom_tichile_jpos_EpsonSerialDriver.so INIT 0x00007254 FINI 0x0000ba08 GNU_HASH 0x000000f8 STRTAB 0x00001f50 SYMTAB 0x00000ae0 STRSZ 0x00002384 SYMENT 0x00000010 PLTGOT 0x0000d108 PLTRELSZ 0x00000008 PLTREL 0x00000011 JMPREL 0x0000724c REL 0x000045c4 RELSZ 0x00002c88 RELENT 0x00000008 TEXTREL 0x00000000 VERNEED 0x00004564 VERNEEDNUM 0x00000002 VERSYM 0x000042d4 RELCOUNT 0x000000ac Version References: required from libstdc++.so.6: 0x056bafd3 0x00 05 CXXABI_1.3 0x08922974 0x00 04 GLIBCXX_3.4 required from libc.so.6: 0x0b792650 0x00 03 GCC_3.0 0x0d696910 0x00 02 GLIBC_2.0 In the recently compiled file I get: Program Header: LOAD off 0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**12 filesz 0x00005300 memsz 0x00005300 flags r-x LOAD off 0x00005300 vaddr 0x00006300 paddr 0x00006300 align 2**12 filesz 0x00000274 memsz 0x00010314 flags rw- DYNAMIC off 0x00005314 vaddr 0x00006314 paddr 0x00006314 align 2**2 filesz 0x000000e0 memsz 0x000000e0 flags rw- EH_FRAME off 0x00004a00 vaddr 0x00004a00 paddr 0x00004a00 align 2**2 filesz 0x00000154 memsz 0x00000154 flags r-- Dynamic Section: NEEDED libstdc++.so.5 NEEDED libm.so.6 NEEDED libgcc_s.so.1 NEEDED libc.so.6 SONAME EpsonFiscalProtocol.so INIT 0x00001cb4 FINI 0x00004994 HASH 0x000000b4 STRTAB 0x00000da4 SYMTAB 0x000004f4 STRSZ 0x00000acf SYMENT 0x00000010 PLTGOT 0x0000640c PLTRELSZ 0x00000270 PLTREL 0x00000011 JMPREL 0x00001a44 REL 0x000019dc RELSZ 0x00000068 RELENT 0x00000008 VERNEED 0x0000198c VERNEEDNUM 0x00000002 VERSYM 0x00001874 RELCOUNT 0x00000004 Version References: required from libstdc++.so.5: 0x056bafd2 0x00 04 CXXABI_1.2 required from libc.so.6: 0x09691f73 0x00 03 GLIBC_2.1.3 0x0d696910 0x00 02 GLIBC_2.0 So I suspect the main diference is the GCC_3.0 symbol I compile libcom_tichile_EpsonSerialDriver.so with the following command ( from memory as I not at work right now ) g++ -Wl,-soname=.... -shared -I/*jni libraries*/ -o libcom_tichile_jpos_EpsonSerialDriver -lEpsonFiscalProtocol -lpthread Is there any way to tell g++ to use that symbol version? Or any idea in how to make it work? EDIT: I have another non-working version with the followin dump: Program Header: LOAD off 0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**12 filesz 0x0000bf68 memsz 0x0000bf68 flags r-x LOAD off 0x0000cc0c vaddr 0x0000cc0c paddr 0x0000cc0c align 2**12 filesz 0x000005e8 memsz 0x00044df0 flags rw- DYNAMIC off 0x0000cc20 vaddr 0x0000cc20 paddr 0x0000cc20 align 2**2 filesz 0x000000f8 memsz 0x000000f8 flags rw- EH_FRAME off 0x0000b310 vaddr 0x0000b310 paddr 0x0000b310 align 2**2 filesz 0x000002bc memsz 0x000002bc flags r-- STACK off 0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**2 filesz 0x00000000 memsz 0x00000000 flags rw- RELRO off 0x0000cc0c vaddr 0x0000cc0c paddr 0x0000cc0c align 2**0 filesz 0x000003f4 memsz 0x000003f4 flags r-- Dynamic Section: NEEDED EpsonFiscalProtocol.so NEEDED libpthread.so.0 NEEDED libstdc++.so.6 NEEDED libm.so.6 NEEDED libgcc_s.so.1 NEEDED libc.so.6 SONAME libcom_tichile_jpos_EpsonSerialDriver.so INIT 0x000055d8 FINI 0x0000a968 HASH 0x000000f4 GNU_HASH 0x00000a30 STRTAB 0x00002870 SYMTAB 0x00001410 STRSZ 0x00002339 SYMENT 0x00000010 PLTGOT 0x0000cff4 PLTRELSZ 0x00000168 PLTREL 0x00000011 JMPREL 0x00005470 REL 0x00004ea8 RELSZ 0x000005c8 RELENT 0x00000008 VERNEED 0x00004e38 VERNEEDNUM 0x00000002 VERSYM 0x00004baa RELCOUNT 0x00000001 Version References: required from libstdc++.so.6: 0x056bafd3 0x00 05 CXXABI_1.3 0x08922974 0x00 03 GLIBCXX_3.4 required from libc.so.6: 0x09691f73 0x00 06 GLIBC_2.1.3 0x0d696914 0x00 04 GLIBC_2.4 0x0d696910 0x00 02 GLIBC_2.0 Now I think the main difference is in the GCC_3.0 symbol/ABI EDIT: Luckily, a coworker found a way to talk to the printer using Java

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  • Advice needed for a home network setup (hardware & software) to handle many clients and potentially heavy traffic

    - by posdef
    I have recently decided to re-structure the home network of our flatshare here. Here's a quick outline of the situation. I envision to have the following 4 devices connected to the router via cable: Xbox 360 IP phone Printer QNAP server (Web, File and Multimedia) We are three people living here, so on top of that there will be to 5-6 computers/mobile devices connecting as wireless clients. My goal is to be able to transfer files (when needed) between the computer and the Multimedia server, which I can reach via 360 and play on the TV. I also would like to keep a high level of security; right now I have the encryption on WPA2 and MAC filtering. I don't believe the web server will get heavy traffic, though I would like to have it responsive. Likewise, I don't have a habit of downloading via torrent etc, but I greatly appreciate my network being responsive and fast, especially when I am browsing or streaming high quality media. Now my questions are: is this setup feasible? smart? efficient? can this be improved somehow? my current router (D-Link DI624) and the previous one (DI-524) used to have spontaneous drops in network, which I find highly irritating. I don't believe in my router, especially now that it completely crashed when I was test-running the setup by transferring a large media file to server while xbox was playing music from the server, and two computers browsing the net. Do I need to get new hardware, if so, any recommendations for a reliable and fast router?

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