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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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• 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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• 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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• 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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• 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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• 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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• Ubuntu 6.06 Boot problem

  - by nijikunai

  I tried to boot my pc using ubuntu 6.06 in the live cd mode but it refuses to boot. It throws the error Uncompressing Linux.. ok, booting from kernel [ 54.168828] ACPI Unable to load the System Descriptor Tables The live cd works perfectly okay in other computers. Out of curiosity, I also tried to boot using Slax live cd, It too threw some errors incomplete literal tree invalid compressed format (err=1) UDF-fs: No partition found (1) XFS: bade magic number XFS: SB validate failed Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0) The slax errors are a bit worrying to me. Thanks for the help in advance!

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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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• u32 filter udp lenght 0 to 29

  - by Mark Ocok

  Sep 30 18:20:02 30AA30 kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=b8:ac:6f:99:8e:b2:a8:d0:e5:bf:71:81:08:00 SRC=66.225.232.169 DST=68.68.27.84 LEN=28 TOS=0x00 PREC=0x00 TTL=49 ID=21668 DF PROTO=UDP SPT=48153 DPT=16078 LEN=8 Sep 30 18:20:02 30AA30 kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=b8:ac:6f:99:8e:b2:a8:d0:e5:bf:71:81:08:00 SRC=66.225.232.169 DST=68.68.27.84 LEN=28 TOS=0x00 PREC=0x00 TTL=49 ID=21669 DF PROTO=UDP SPT=48153 DPT=16078 LEN=8 Sep 30 18:20:02 30AA30 kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=b8:ac:6f:99:8e:b2:a8:d0:e5:bf:71:81:08:00 SRC=66.225.232.169 DST=68.68.27.84 LEN=28 TOS=0x00 PREC=0x00 TTL=49 ID=21670 DF PROTO=UDP SPT=48153 DPT=16078 LEN=8 Sep 30 18:20:02 30AA30 kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=b8:ac:6f:99:8e:b2:a8:d0:e5:bf:71:81:08:00 SRC=66.225.232.169 DST=68.68.27.84 LEN=28 TOS=0x00 PREC=0x00 TTL=49 ID=21671 DF PROTO=UDP SPT=48153 DPT=16078 LEN=8 It's Spoofing attack dos, how to block Spoofing UDP lenght 0 to 29 using u32 Flooder target udp length udp 0 to 29

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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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• 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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• 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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• 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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• Nginx HTTPS when only matching admin subfolder

  - by sebastyuiop

  I have managed to get all /admin requests redirected to https by: server { listen 80; location /admin { rewrite ^ https://$server_name$request_uri?$args permanent; } } But can't figure out how to get all https requests that are not within /admin redirected to http, so far I have: server { listen 443; location ~ /admin { rewrite ^ http://$server_name$request_uri?$args permanent; } } EDIT: I have got the redirects working as required but can't stop the /admin url going to 404. It feels like I need to put something in the empty block. server { listen 443; location /admin { } location / { rewrite ^ http://$server_name$request_uri?$args permanent; } } Thanks

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• Occasional HDD Related Hangs

  - by diolemo

  I have an issue that seems to be disk related. Occasionally my system will block for 30 or so seconds and is mostly unresponsive. Those things already in memory requiring no disk access continue to function but those things requiring disk access (even small) hang. 30 seconds later everything is back to normal. I have 2 Samsung drives in RAID 0. I have 1 WD drive (has pagefile) I have an SSD used for caching (Intel Smart Response). This is a new install of Windows and the drives were fine in my old PC (~1 month ago). Has anyone experienced anything similar? Any suggestions to solve this one? Thanks in advance.

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• What protocols will/are ISPs use for IPv6 deployment?

  - by rbeede

  Currently ISPs deal out addresses via DHCP for IPv4 dynamic (single) addresses. What protocol will/are ISPs going to use for IPv6 when they can hand a customer an entire /64 (or /48 if they are nice) block? DHCPv6, RA? For ISPs that support true end-to-end IPv6 will they provide gateway devices (similar to cable modem or true DSL bridges for example) that receive border information for that specific customer? I'm just trying to get an idea of how your common residential service customer will have to configure things in an IPv6 Internet (whenever that comes). Will it be something customers are expected to statically configure on their home wireless router? Today with IPv4 I do it like this: Modem (bridge) passes public IPv4 obtained via DHCPv4 from ISP to second device (wireless router). It in turn has its own DHCPv4 service it provides on the internal lan.

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• Shrink NTFS Partition Windows 2003

  - by Coops

  We have an iSCSI target provided by a CentOS server attached to a Windows Server 2003 Standard box, formatted in NTFS. My question is this - I know we can resize the backend block device fine (LVM et al.), however how do you tell Windows the NTFS filesystem has shrunk afterwards? [note we want to shrink]. I'm imagining a world of pain if it's not done correctly! This is a production box, so ideally we'd like the process to keep the drive mounted and online during the process, but downtime can be scheduled if need be. 90% of what I've found on the subject so far basically involves using the 'ntfsresize' command in Linux to do the job -- but surely Windows can do this itself? Cheers!

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• Database implementation question? [closed]

  - 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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• Mimicking Google's Persistant 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 "Persistant 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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• Best way to copy large amount of data between partitions

  - by skinp

  I'm looking to transfer data across 2 lv of an HP-UX server. I have a couple of those transfers to do, some of which are mostly binary (Oracle tablespace...) and some others are more text files (logs...). Used data size of the volumes is between 100Gb and 1Tb. Also, I will be changing the block size from 1K to 8K on some of these partitions... Things I'm looking for: Guarantees data integrity Fastest data transfer speed Keeps file ownership and permissions Right now, I've thought about dd, cp and rsync, but I'm not sure on the best one to use and the best way to use them...

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• JBoss 4.2.3 Won't Start

  - by Thody

  Hi, I'm trying to start a new installation of JBoss 4.2.3, and it's getting as far as "INFO [Server] Core system initialized", then hanging for several minutes. There is a Java process running, but only at ~35%. Also, looking at the boot.log, there are no entries after ~1s after starting the boot. Any ideas what might be up? Update: After about 10 minutes, I got a handful of garbage collection warnings: GC Warning: Repeated allocation of very large block (appr. size 512000): May lead to memory leak and poor performance.

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• What kind of website traffic can a 10mpbs connection handle?

  - by Blankman

  I need some help understanding firewalls. I played around with Amazon EC2 and it seems to provide a firewall out-of-the-box. When I say firewall, to me that means the ability to block ports from being accessed from the outside world, or to only specific security groups. I'm looking at a dedicated server hosting provider and they provide a hardware firewall for $50/month and it is limited to 10mbps. Can someone explain to me what kind of traffic this correlates to? Are these usually limited to the number of simultaneous connections also?

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• Eclipse style autohotkey commands

  - by Ph4g3

  Is autohotkey capable of interpreting hotkeys in the style of Ctrl + Shift + W, W? I would assume a script like the following would work: ^+W:: ; Windows hotkeys (Ctrl + Shift + W) O:: Run Outlook ; Subsequent 'o' pressed => Run outlook E:: Run Explorer ; return From the documentation I note that these are called vertically stacked hotkeys and cause each line to perform the same action. In the case above, I think Ctrl+Shift+W and o will both cause outlook to be launched, whereas pressing e would cause explorer to be launched. What I would like is Ctrl+Shift+W, O runs outlook and Ctrl+Shift+W, e runs windows explorer. Is there any way to cause a hotkey to perform context specific actions (much like in Eclipse), where I can press Ctrl+Shift+W to activate a block of specific hotkeys?

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• Is it possible with Google searches to ban any and all results from a domain? [closed]

  - by Stu Thompson

  Is it possible to configure Google somehow to permanently ban search results from domains that I know 100% are never, ever going to make me happy? Something cookie/session based maybe? E.g. I want to ban (permanently, forever and always) results from experts-exchange.com. Every time I click results that take me to their page I just want to scream. Update! Google has released a Chrome Extension to allow users to block individual site from Google search results! Personal Blocklist (by Google). (Since this question has been closed, I cannot answer it.)

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• Managing multiple ssh keys

  - by Mathijs Kwik

  I have a lot of ssh keys, they are all passphrase protected and managed by ssh-agent. As a result of this, I am now getting "Too many authentication failures" on some connections. As has been explained on this site before, this is because ssh will try all keys the agent throws at it. The proposed solution is to use IdentitiesOnly in the config, together with an IdentityFile. While this indeed stops offering wrong keys, it seems it completely disables the agent in full, so now I have to type the passphrase on every connection. I could not find clear info about this. Does IdentitiesOnly just disable getting keys from ssh-agent in full? Or should it just block out the keys that aren't mentioned? Thanks, Mathijs # here's my config ~% cat .ssh/config Host bluemote HostName some.host.com IdentitiesOnly yes IdentityFile /home/mathijs/.ssh/keys/bluebook_ecdsa # I had the key loaded into the agent, shown here ~% ssh-add -L ecdsa-sha2-nistp521 SOME_LONG_BASE64_NUMBER== /home/mathijs/.ssh/keys/bluebook_ecdsa # but it doesn't seem to get used ~% ssh bluemote Enter passphrase for key '/home/mathijs/.ssh/keys/bluebook_ecdsa':

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