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• Hadoop Rolling Small files

  - by Arenstar

  I am running Hadoop on a project and need a suggestion. Generally by default Hadoop has a "block size" of around 64mb.. There is also a suggestion to not use many/small files.. I am currently having very very very small files being put into HDFS due to the application design of flume.. The problem is, that Hadoop <= 0.20 cannot append to files, whereby i have too many files for my map-reduce to function efficiently.. There must be a correct way to simply roll/merge roughly 100 files into one.. Therefore Hadoop is effectively reading 1 large file instead of 10 Any Suggestions??

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• SFTP over double server hop

  - by josh.trow

  I'm trying to work out a method to allow me to access files on an SFTP server than I cannot access from my local machine. Currently, I have to SSH to a remote server (it is in a certain IP block that the final SFTP server will accept from), then from there SFTP to the destination server. From there, I get the files I am interested in, thereby dropping them onto the middleman server, from which I can get the files either over a Samba share or with a direct scp. I also work in the reverse, where I drop the files onto the middleman, SSH to it then SFTP to the destination and put them into the appropriate folders. My goal is to shorten this. The unfortunate restrictions are that my machine is Windows (I use KiTTy and/or Cygwin) and I cannot modify the middleman server (or destination server) in any way. I am willing to use command line or GUI programs so long as it works and is free. Any ideas?

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• blocking port 80 via iptables

  - by JoyIan Yee-Hernandez

  I'm having problems with iptables. I am trying to block port 80 from the outside, basically plan is we just need to Tunnel via SSH then we can get on the GUI etc. on a server I have this in my rule: Chain OUTPUT (policy ACCEPT 28145 packets, 14M bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * eth1 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED And Chain INPUT (policy DROP 41 packets, 6041 bytes) 0 0 DROP tcp -- eth1 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED Any guys wanna share some insights?

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• send mail via smtp on debian 6?

  - by acidzombie24

  i followed this tutorial http://library.linode.com/email/exim/send-only-mta-debian-6-squeeze?format=print When i got to the end, i sent the email to [email protected]. I didnt receive it. I didnt get spam either, i got nothing. I also didnt get an error message on the console. How do i properly sent up a smtp server and send an email from it? I'll not i am testing this on my VM on my local computer. My ISP doesnt block any traffic whatsoever (which is one reason why i use them) so... what can i do? i also tried this tutorial

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• Blocking facebook's Like button in firefox

  - by Quiark

  Many sites today use widgets from facebook such as the Like button, list of friends who are fans of that site and so on. While it may be a nice feature, I perceive it to be a serious privacy intrusion, because facebook most likely stores information about which sites you visit. I also heard that when you are not logged into facebook, it still tracks the sites you visit (probably with a cookie) and once you log in attaches the data to your real account. For now, I want to keep using facebook, but I would like to block just these widgets so it can't track me. Is there any Firefox extension which could do that?

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• Is it necessary to have firewalls rules between trusted nodes communicating on their backend interfaces?

  - by Tom

  I have 6 nodes that have internet access on eth1 and private access to one another on eth0. Currently I have firewall rules for eth0, for things like memcached and NFS. Is this necessary? It's a real headache as NFS for example communicates on loads of different ports, and I recently introduced glusterfs which needs more still. Is the headache of figuring out what backend ports to unblock worth the security enhancement? I should mention that I will of course still have a firewall rule on eth0 to block servers owned by others in the same datacenter. Thanks

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• How to throw a 404 error from htaccess?

  - by John Isaacks

  Everything I find seems to be about created a custom 404 page. That is not what I am trying to do. If I want to block access to a page I can do this in htaccess: RewriteRule pattern - [F] However, "Forbidden" hints that the page does exists. I want the page to appear to not even exist. So I would like to give a 404 error instead of a 403. Then have it render whatever 404 page would render if the resource really wasn't there. How can I do that?

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• Mimicking Google's Persistent Disks -- Is this a logical FreeBSD disaster recovery strategy?

  - by Casey Jordan

  I am looking into FreeBSD to provide a more comprehensive backup and disaster recovery strategy for database servers. Ideally I want to mimic what google is doing with "Persistent disks" https://developers.google.com/compute/docs/disks#snapshots I am hoping someone who knows more about FreeBSD can validate these ideas/questions: I have read that FreeBSD can take instant disk snapshots, therefore if our databases trigger a consistent state (Block all writes, and flush buffers to disk), I would assume I could take snapshots every hour without service interruption for more than a few seconds. Is this true? Is there a way to take snapshots and back them up offsite easily? Can this be done incrementally as to save how much disk space is actually used? If a rollback needed to be done, how long does this typically take? Is a rollback also instantaneous? Thanks!

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• Enlarge partition on SD card

  - by chenwj

  I have followed Cloning an SD card onto a larger SD card to clone a 2G SD card to a 32G SD card, and the file system is ext4. However, on the 32G SD card I only can see 2G space available. Is there a way to maximize it out? Here is the output of fdisk: Command (m for help): p Disk /dev/sdb: 32.0 GB, 32026656768 bytes 64 heads, 32 sectors/track, 30543 cylinders, total 62552064 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000e015a Device Boot Start End Blocks Id System /dev/sdb1 * 32 147455 73712 c W95 FAT32 (LBA) /dev/sdb2 147456 3994623 1923584 83 Linux I want to make /dev/sdb2 use up the remaining space. I try resize2fs /dev/sdb after dd, but get message below: $ sudo resize2fs /dev/sdb resize2fs 1.42 (29-Nov-2011) resize2fs: Bad magic number in super-block while trying to open /dev/sdb Couldn't find valid filesystem superblock. Any idea on what I am doing wrong? Thanks.

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• Apache2: How do I restrict access to a directory, but allow access to one file within it?

  - by Nick

  I've inherited a poorly designed web app, which has a certain file that needs to be publicly accessible, but that file is inside a directory which should not. In other words, I need a way to block all files and sub-directories within a directory, but over-ride it for a single file. I'm trying this: # No one needs to access this directly <Directory /var/www/DangerousDirectory/> Order Deny,allow Deny from all # But this file is OK: <Files /var/www/DangerousDirectory/SafeFile.html> Allow from all </Files> </Directory> But it's not working- it just blocks everything including the file I want to allow. Any suggestions?

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• Can Visual Studio track the "size" or "severity" of my changes in TFS?

  - by anaximander

  I'm working on a sizeable project using VS2012 and TFS (also 2012, I think - I didn't set up the server). A lot of my recent tasks have required making very small changes to a lot of files, so I'm quite used to seeing a lot of items in my Pending Changes list. Is there a way to have VS and/or TFS track how much has been changed and let me know when the differences are becoming significant? Similarly, is there a way to quickly highlight where the major changes are when you get the latest version from TFS? It'd really help with tracking down where certain changes have been made without having to go through and compare every file - the difference highlighting tool might be nice, but when you have to use it on a dozen files to find the block you're looking for, you start to wonder if there's a faster way...

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• How to restrict access to other Wifi networks in range?

  - by meetpd

  Is there a way to access connecting to other wifi networks in range? I have an office and there are few wifi networks in range. Some of them are not password protected and invariably I get connected to that wifi first. I have talked to the person who owns that wifi. But he is somehow not listening about adding password to his network. So, is there a way I can block that Wifi network completely so that I do not connect to it? I have Win 7 and Mac at my office.

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• Creating bootable Fedora USB with persistent storage

  - by dooffas

  I am attempting to burn the full Fedora 19 x86_64 DVD iso to a USB drive and have a separate partition on it for a kickstart file / other media that will be installed in the kickstart process. With the Ubuntu server 12 iso, you can simply dd the iso to the usb drive: dd if=/path/to/iso of=/dev/sdb Once the iso has been burnt, open gparted and create a ext2 parition in the allocated space. However, this does not seem to work with the Fedora ISO. When loading the USB drive in gparted I get a warning and an error: Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes. Error: The partition's data region doesn't occupy the entire partition. Ignoring both of these errors allows gparted to load the usb drive, however it shows a blank drive with no partition table. Has anyone come across this before? From what I have found, it may have something to do with the fact that Fedora use isohybrid.

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• Database implementation question?

  - by gundam

  consider a disk with a sector size of 512 bytes, 2000 tracks/surface, 50 sectors/track, 5 doubled sided platters, average seek time is 10 msec. Assume a block size of 1024-byte is selected. Assume a file that contains 100,000 records of 100-byte each is to be stored on the disk, and NONE of the reocd can be spanned 2 blocks. How many blocks are needed to store the entire file?? If the file is arranged sequentially on disk, how many surfaces are required?? Now, i have calculated that 10,000 blocks are needed to store 100,000 records. But i am not sure how to find out the answer of the surfaces required. I only calculated the capacity of track is 25KB and capacity of surface is 50,000 KB But I don't know how to calculate the number of surfaces... Could anyone help me how to get the answer? Thanks a lot!!

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• Restart an in-use NFS server without interruption (within timeout)

  - by zebediah49

  I have a bunch of compute clients working on jobs, saving output data to a NAS machine. All machines are centos 6.2. They mount it via automount NFS, with a timeout of 1200 (default config). The NAS machine needs to be restarted. If I can restart the machine within that 1200s (20 minute) window, will the clients just block on IO until it comes back up? A minor interruption (pause) in service is ok, as long as it doesn't cause the running processes to error out. If necessary I could loop through and SIGSTOP all job processes, restart and resume them -- I just don't want to break the open file handles. How can I run a restart like this without killing processes with open files?

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• Web Content Filtering for Windows Clients

  - by djoyce

  I'm working with a small business to solve a bunch of problems. One is their Windows 7 POS registers need to have web access restricted to only three remote support sites, but the back office machine needs an unfiltered connection. I'd like something I can install and configure on the few registers to block all but those few sites. In a perfect world this would restrict the normal register user, but the admin user would not be filtered. Free is best, if it works, but a small fee would be alright too. Microsoft's Family Safety filter is close, but requires a Windows Live account, which isn't ideal, but may be alright. Anyone use this in a small business environment? I'd prefer something easily managed at the local machines. K9 Web Protection is interesting and I'm going to look into it more. Are there other options? Seems like someone would have made something simple like this as an open source project, but maybe not.

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• Iptables to lock down compromised server to a single ip

  - by ollybee

  I have a Linux server which is compromised, I can see nasty looking perl scripts executing with root privileges. I want to get some data off it before I wipe it. How can I block all inbound and outbound traffic except for my ip? It's a Centos server I assume i can do this with iptables? I'm aware a the server is rooted there is a possibility that attackers could have made changes on the server that would prevent this from working. Ill be testing to make sure and only have the server online for a couple of hours before it is nuked.

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• What sort of things can cause a whole system to appear to hang for 100s-1000s of milliseconds?

  - by Ogapo

  I am working on a Windows game and while rendering, some computers will experience intermittent pauses ("hitches" for lack of a better term). When profiled they appear in seemingly random places in the code. Eventually I noticed that it wasn't just my process that was affected, but (seemingly) every process on the system. All of the threads in my application hitch at once. The CPU utilization drops during these hitches and it appears as if most processes make no progress. This leads me to believe this may be an Operating System or Driver issue, but it only occurs while playing the game (and only on some systems). What sort of operations might the operating system be doing that would require the kernel to pause all user threads and block. Some kind of I/O? At first I thought of paging but my impression is that would only affect a single process, no? Some systems in use: Windows, DirectX (3d), nVidia cards (unknown if replicates on ATI), using overlapped io for streaming

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• How to avoid loop limitation in a openvz container?

  - by mat.viguier

  On a openVZ containing Deb7 I need to lock the maximum size of a folder, which is used to upload on a php based web server. The directory is synced, so I have to lock the maxsize. MAXSIZE should be upgradable by adding some physical disk later ... I want to use a file as a block device for a file system. So I have done : dd if=/dev/zero of=/disk2/filesystem.dat bs=1M count=100 Then, I made the filesystem on it mkfs.ext4 filesystem.dat Then I tried to mount it : mkdir /opt/filesystem ; mount /disk2/filesystem.dat /opt/filesystem My OpenVZ (it is on a VPS) has no loop module in the kernerl. So I got Could not find any loop device as usual under OpenVz So i think I have to use FUSE, but I really do not know HOW .... Any idea on locking the size of directory under OpenVZ ?

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• How to point subdomain to a nameserver?

  - by vonconrad

  I've got an old crusty WHM/cPanel server which I'm trying to get rid of. I've got a new setup on shared hosting which is much cheaper in the long run. The problem is that there are a bunch of websites on the server whose domains I don't have access to. They're currently pointing to name servers of my domain (ns.mydomain.com), but the new provider has their own name servers (ns.provider.com) which I have to use instead. My initial idea was to set up a CNAME to point my name server to my provider's: ns.mydomain.com CNAME ns.provider.com, but I read in this question that this would be a bad idea. The accepted answer suggests using an A record instead, and I want to make sure how this would work. Assuming ns.provider.com has an IP address of 123.123.123.123, is it just a matter of doing ns.mydomain.com A 123.123.123.123? Is there any way the provider could block those requests as the name server domain technically doesn't belong to them?

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• How do I get `set show-all-if-ambiguous on` in my .inputrc to play nice with the Python interpreter?

  - by ysim

  I noticed that after I added the set show-all-if-ambiguous on line to my ~/.inputrc, whenever I pressed tab to indent a block, it would show me the bash Display all ... possibilities? (y or n) prompt, and leave me unable to indent the actual code. Is there any way to keep that line in my .inputrc but still have the tab key work as expected in the Python interpreter? This is in my VirtualBox Ubuntu 12.04 VM, if it matters. EDIT: Curiously, I now have a different issue with the Python shell that comes with Django -- when I press tab, I get Python tab completion, but only with one Tab press. I've opened a separate question here for it.

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• Vim Misbehaving

  - by zchtodd

  I'm not sure what changed, but lately Vim has been driving me nuts. Whenever I try to do a column mode insert, vim takes my current character and adds to the last character I inserted. For example, the first time I do a block comment by inserting # on multiple lines, it works fine. The next time, however, I end up with ## inserted on every line, and the problem just compounds from there. To do this, I'm hitting Ctrl-V, down or up arrow, Shift-I, #, and then Esc. This worked for months, but now it seems to be pasting extra stuff in. I've tried disabling all .vimrc files, but the behavior remains the same. Any ideas?

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• Is there a way to create a copy-on-write copy of a directory?

  - by BCS

  I'm thinking of a situation where I would have something that creates a copy of a directory, tweaks a few files, and then does some processing on the result. This wold be done fairly often, maybe a few dozen times a day. (The exact use case is testing patch submissions; dupe the code, patch it, build/test/report/etc.) What I'm looking for could be done by creating a new directory structure and populating it with hard links from the origonal. However this only works if all the tools you use delete and recreate files rather than edit them in place. Is there a way to have the file system do copy-on-write for a file? Note: I'm aware that many FSs use COW at a block level (all updates are done via writes to new blocks) but this is not what I want.

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• Setting Events in Matlab/Simulink Stateflow

  - by GuiccoPiano

  How can I set an event in a Simulink Stateflow (statechart) based on some value. What I mean is this. I have a variable called "choice". This "choice" comes in as an input from a simulink block.The value of choice is between 1 and 4. So all I want to do is this: if choice == 1 then trigger/set eventBlue if choice == 2 then trigger/set eventRed if choice == 3 then trigger/set eventWhite if choice == 4 then trigger/set eventGreen else trigger/set eventYellow So how do i do that? what is the command?

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• iptables to allow input and output traffic to and from web server only

  - by Caedmon

  I have an Elastic Search server which seems to have been exploited (it's being used for a DDoS attack having had NO firewall for about a month). As a temporary measure while I create a new one I was hoping to block all traffic to and from the server which wasn't coming from or going to our web server. Will these iptables rules achieve this: iptables -I INPUT \! --src 1.2.3.4 -m tcp -p tcp --dport 9200 -j DROP iptables -P FORWARD \! --src 1.2.3.4 DROP iptables -P OUTPUT \! --src 1.2.3.4 DROP The first rule is tried and tested but obviously wasn't preventing traffic coming from my server to other IP addresses so I was hoping I could add the second two rules to full secure it.

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