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• Simple recursive DNS resolver for debugging (app or VM)

  - by notpeter

  I have an issue which I believe is caused by incorrect DNS queries (doubled subdomains like _record.host.subdomain.tld.subdomain.tld) when querying for SRV records. So I need to an alternate DNS server with heavy logging so I can see every query (especially stupid ones), acting as a recursive resolver with the ability create records which override real DNS records so I can not only find the records it's (wrongly) looking for, but populate those records as well. I know I could install a DNS server on yet another linux box, but I feel like this is the sort of thing that someone may already setup a simple python script or single use vm just for this purpose.

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• restoring myisam mysql db on a different machine

  - by RainDoctor

  I have copied the web db directory(/var/lib/mysql/data/web/), when mysql is not running. I transferred this directory to another machine, where mysql is running. web db's stuff is myisam based. I am thinking about how to restore this on a different server. The strategy I have on my mind is the following. copy the data directory of web db to the new server. on new server, 'create database web', which creates a directory in /var/lib/mysql/data copy all files from the step to the new directory created in 2. bounce mysql My question: how to deal with information_schema for this new db?

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• Email is stuck in the queue with 421 4.2.2 Connection dropped due to SocketError

  - by e0594cn

  We recently installed an Exchange 2010 Server and we are having some problems sending emails to certain domains. Email is stuck in the queue with 421 4.2.2 Connection dropped due to SocketError. Any Suggestion? The below is the message when using telnet command: EHLO etla.com.cn 250-aa6061.com Hello [58.215.221.50] 250-TURN 250-SIZE 15360000 250-ETRN 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-8bitmime 250-BINARYMIME 250-CHUNKING 250-VRFY 250-X-EXPS GSSAPI NTLM LOGIN 250-X-EXPS=LOGIN 250-AUTH GSSAPI NTLM LOGIN 250-AUTH=LOGIN 250-X-LINK2STATE 250-XEXCH50 250 OK MAIL FROM:[email protected] 250 2.1.0 [email protected] OK RCPT TO:[email protected] NOTIFY=success,failure **550 5.7.1 Your email messages have been blocked by the recipient OR by Trend Mic ro Email Reputation Service. Contact the recipient or his/her administrator usin g alternate means to resolve the issue.**

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• Netcat server output with multiple greps

  - by Sridhar-Sarnobat

  I'm trying to send some data from my web browser to a txt file on another computer. This works fine: echo 'Done' | nc -l -k -p 8080 | grep "GET" >> request_data.txt Now I want to do some further processing before writing the http request data to my txt file (involving regex maniuplation). But if I try to do something like this nothing is written to the file: echo 'Done' | nc -l -k -p 8080 | grep "GET" | grep "HTTP" >> request_data.txt (for simplicity of explanation I've used another grep instead of say awk) Why does the 2nd grep not get any data from the output of the first grep? I'm guessing piping with netcat works differently to what I've assumed to get this far. How do I perform a 2nd grep before writing to my txt file? My debugging so far suggests: It is nothing to do with stderr vs stdout Parentheses don't help

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• What is the purpose of a boot priority sequence or order in BIOS

  - by rbeede

  A BIOS provides multiple options for specifying an order/priority to search for boot devices. Is there really much of a purpose now to have to specify more than one possible boot device? It would seem to me it is only useful when popping in an CD/DVD to install an OS after which the common scenario is to always boot from the hard drive unless something is broken. I'm curious as to why not simply have 1 option/device to set in the BIOS and expect the user to press a key to do alternate boot instead? Is there still a scenario for having the BIOS try multiple devices in a configured order?

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• zero-config CGI enabled web server

  - by halp

  To serve static content of a directory over http, one can simply navigate to that directory and type: python -m SimpleHTTPServer 11111 which will start a http server on port 11111. This hack is nice because it requires zero-config: no stand-alone web server, no config files at all. Is it possible to extend this example, or have an alternate way to achieve this goal, but also have CGI support? The final goal is to have a quick and lazy way of serving a web site from a certain directory. The site has static content (HTML pages, images), but also a CGI script. The CGI script must work properly when accessed via browser. Of course I could setup a virtual host in apache, allow CGI inside it etc. But that's not a zero-config approach.

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• Excel formula - sometimes array formula, sometimes not

  - by Jonas

  I want to write some data to an Excel file, and I want the first page to show a summary of the data that are spread all over the sheets. The individual data items on a sheet can be included or excluded, and I want the summary to be calculated only on the included values. Thus, I thought I'd use a formula like this to show, for example, an average (for which empty fields shouldn't be counted, either): =AVERAGE(IF('dataSheet1'!$B:$B=1,IF('dataSheet1'!$I:$I<>"",'dataSheet1'!$I:$I,""),"")) If I have this formula in dataSheet1, everything works fine. If I have this formula in the summary sheet, I need to enter it as an array formula, and I have to specify the exact ranges to make it work. Is there a way (aside from adding the average in dataSheet, and then referencing the result in summary) to make the formula work without having it turn into an array formula?

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• Duplicate incoming TCP traffic on Debian Squeeze

  - by Erwan Queffélec

  I have to test a homebrew server that accepts a lot of incoming TCP traffic on a single port. The protocol is homebrew as well. For testing purposes, I'd like to send this traffic both : - to the production server (say, listening on port 12345) - to the test server (say, listening on port 23456) My clients apps are "dumb" : they never read data back, and the server never replies anyway, my server only accepts connections, and do statistical computations and store/forward/service both raw and computed data. Actually, client apps and hardware are so simple there is no way I can tell clients to send their stream on both servers... And using "fake" clients is not good enough. What could be the simplest solution ? I can of course write an intermediary app that just copy incoming data and send it back to the testing server, pretending to be the client. I have a single server running Squeeze and have total control over it. Thanks in advance for your replies.

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• PEN daemon as load balancer, IIS web logs not showing true requester IPs

  - by Aszurom

  I have a Hercules vmware appliance, which is a micro-linux vm that runs the PEN daemon and acts as a server load-balancer. It takes any incoming request on the appliance's IP and routes it out to a number of alternate IPs. The logs of the daemon show the true IP of the browsers hitting the website. The logs of the websites themselves (iis 6 and 7) only show the requester IP as being that of the load balancer. The IT manager tells me that when we had a hardware appliance (serveriron XL) doing the load balancing, the web logs reflected the requester IPs accurately. Is there any way to get this resolved with the daemon, or will I be digging that out of the closet and plugging it back in?

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• How to get average of multiple time series

  - by Supun Kamburugamuva

  I have few computers running. I want to get the average CPU usage of these computers and plot it as a graph. So I've collected CPU usage in regular intervals in these machines. So for each computer I have a data set of time and CPU usage. But the times at which CPU measurements are taken in different machines are not in sync. For example in 1st machine CPU may be measured in time 1, 5, 9. In the second machine CPU may be measured in time 2, 5, 8. I want to get an average data series from these different data sets. Could you point me to some resources? Thanks - Supun.

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• Ubuntu User WWW/FTP

  - by SnIpY

  I have a user named 'user' which I use to login to the ftp of my website. However, this presents me with a problem. If I want to allow my user to access to ftp, I have to typ the following: chown -R user:ftpusers /var/www/ By doing this, my website is no longer available when surfing to it. To make it available again, I have to typ the following command: chown -R www-data:www-data /var/www/ the user 'user' is in both the ftpusers and www-data group. How can I fix this so I wouldn't have to typ this anymore? I'm using apache2 and vsftpd on ubuntu

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• ls returns nothing only in certain directories

  - by Jakobud

  I have a raid drive mounted here: /data/ And certain directories like this one: /data/somedir/somesubdir/ when I run ls w/ or w/o any flags, terminal doesn't return anything. It does not return an empty directory listing. It simply goes to the next line and sits there blank with no prompt coming up. I cannot CTRL-C out of it. I have to close this terminal instance and start over. At first I thought it was something to do with the ls command, but its pointing to /bin/ls and I can ls other directories just fine. Also, running this find /data/somedir/somesubdir immediately finds all the files just as expected.

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• Has anyone used products by StorSimple? [closed]

  - by AlamedaDad

  Their products are storage systems similar to NetApp, but their "hook" is they provide automated tiered storage with the third tier being Cloud providers like Amazon and Azure. They have an interesting story in which they provide primary SAN/iSCSI storage to VMWare and Exchange and at the same time do snaphots to the Cloud. This provides a possible DR option if you have a second system at an alternate location. I was impressed, but I've never heard of them so I'm looking for input and advise on the product. Thanks in advance...

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• dvd burning software for ubuntu

  - by user23950

  I've tried brasero which is the default software for burning data in ubuntu. But it seems to be malfunctioning. I thought it can only burn image files. And it cannot distinguish what file you are burning. I'm burning .avi files to be burned as a data. But I can only see the option burn as an image file. Do you know of any other software for ubuntu that can burn files as a data?

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• HDD is not readable - can I fix this

  - by user1983017

  I have two HDD in my system, but today morning the additional hard disk is not readable. My all data are kept inside the additional HDD. When I disconnect the additional HDD from my system then system boot as usual, but when I connect HDD my system hangs Up in windows boot logo. Please note this problem is not related to HDD order. When I connect only the additional HDD then system shows this error: disk not readable press ctrl+alt+del to restart I can see the name of additional HDD in BIOS. When I connect both HDD i get a continues beep... beeep .. beep sound. Please tell me is my HDD gone dead ? How do I get the data back ? is there any kit for recovering HDD data ?

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• Confusion about TCP packet analysis terms

  - by Berkay

  I'm analyzing our network and have some confusion about the terms: this is the 2-packet output from source to destination. from these i have to get some features as describe, pls make me clear... packets with at least a bytes of TCP data payload: it seems tcp.len0; The minimum segment size (confusion is headers are included or or not) The average segment size observed during the lifetime of the connection, the definition: is calculated as the value reported in the actual data bytes divided by the actual data pkts reported. Total bytes in IP packets, should be ip_len value. Total bytes in (Ethernet) The total number of bytes sent probably related to frame.len and frame.cap_len these two terms are describes as, also make me clear about these two terms. frame.cap_len: Frame length stored into the capture file frame.len: Frame length on the wire

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• Securely wiping a file on a tmpfs

  - by Nanzikambe

  I have a script that decrypts some data to a tmpfs, the directory is secure (permissions), the machine's swap is encrypted (random key on boot) and when the script is done it does a 35 pass wipe (Peter Gutmann) of the cleartext on the tmpfs . I do this because I'm aware wiping files on a journaling file system is insecure, data may be recovered. For discussion, here're the relevant bits extracted: # make the tmpfs mkdir /mnt/tmpfs chmod 0700 /mnt/tmpfs mount -t tmpfs -o size=1M tmpfs /mnt/tmpfs cd /mnt/tmpfs # decrypt the data gpg -o - <crypted_input_file> | \ tar -xjpf - # do processing stuff # wipe contents find . -type f -exec bcwipe -I {} ';' # nuke the tmpfs cd .. umount -f /mnt/tmpfs rm -fR /mnt/tmpfs So, my question, assuming for the moment that nobody is able to read the cleartext in the tmpfs while it exists (I use umask to set cleartext to 0600), is there any way any trace of the cleartext could remain either in memory or on disk after the snippet above completes?

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• What are the consequences of giving an AD domain differing NetBIOS and DNS names?

  - by Newt

  In the past, when creating AD domains, I've used the common convention of using a sub-domain of the company's publicly registered domain name, e.g "corp.mycompany.com" or "int.mycompany.com". I've always accepted the default NetBIOS name when running DCPromo, for fear that creating a NetBIOS name that differs from the sub-domain may cause complications. I've recently been doing a bit of research on the consequences of providing an alternate NetBIOS name. The main reasons behind this are: The NetBIOS name isn't particularly descriptive or unique to the company Apparently generic NetBIOS names such as "CORP" or "INT" can cause issues when merging IT systems (although I've not had experience with this myself) Providing something "before the slash" that means more to users (less important) In looking at the possible downsides, the only one I can come up with is the disjointed namespace issue when configuring Exchange. Can anybody with more experience than I elaborate on my findings at all? Many thanks

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• Windows Server Backup - Can I restore to a particular revision?

  - by hamlin11

  I'm using Windows Server Backup in Windows Server 2008 to do a scheduled daily backup to a dedicated hard-drive on the server. I noticed that under "All backups" it says I have 45 copies. Does this mean that I can restore to any revision of my data upon system failure? If the answer is yes, then I don't have to worry about taking monthly or weekly snapshots of my data. I'm concerned about a data corruption event occurring that working its way into my backups... then not having a clean snapshot to go back to. Thanks!

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• Does multiple files in SQL Server when using RAID help reduce conflicts in growth and file-locking?

  - by Dr Giles M

  I've been reading around and get the impression that if you are using RAID then using multiple SQL Server files within a filegroup won't yeild any more improvements, and the benefits are purely administrative (if you started to run out of space or wanted to partition off data into managable chunks for backups/balancing the data around your big server room). However, being a reasonably savvy software person, it's not unthinkable to hypothesise that, even for smaller databases that SQL Server will perform growth and locking operations (for writes) on a LOGICAL file basis, so even if you are using RAID, it seems to make sense to have multiple files in a file group to balance I/O, or does the time taken to reconstruct the data from distributed filegroups outweigh the benefits of reduced locking? I'm also aware that the behaviour and benefits may be different for tables/indeces/log. Is there a good site that distinguishes the benefits of multiple files when RAID is already in place?

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• Files listed by bash but unaccessible

  - by Cerin

  What would cause the following behavior on an Ubuntu 12.04 system? I've SSHed into a machine as the "ubuntu" user. Running ls -lah /data/* shows dozens of non-empty files (e.g. file1.txt, file2.txt, etc), all owned by the "ubuntu" user/group, and with full read/write access. If I try to cat /data/file1.txt, bash gives me the error "cat: /data/file1.txt: No such file or directory" In short, ls is listing files, but in every other way, the files essentially don't exist. I can't cat them or read them in any way. Even giving all the files 777 permission doesn't change anything. This is really bizarre. What's going on here?

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• Database OR Array

  - by rezoner

  What is the exact point of using external database system if I have simple relations (95% querries are dependant on ID). I am storing users and their stats. Why would I use external database if I can have neat constructions like: db.users[32] = something Array of 500K users is not that big effort for RAM Pros are: no problematic asynchronity (instant results) easy export/import dealing with database like with a native object LITERALLY ps. and considerations: Would it be faster or slower to do collection[3] than db.query("select ... I am going to store it as a file/s There is only ONE application/process accessing this data, and the code is executed line by line - please don't elaborate about locking. Please don't answer with database propositions but why to use external DB over native array/object - I have experience in a few databases - that's not the case. What I am building is a client/gateway/server(s) game. Gateway deals with all users data, processing, authenticating, writing statistics e.t.c No other part of software needs to access directly to this data/database.

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• Windows 7: Open File - Security Warning box appears for every app on the desktop

  - by Michael Ratanapintha

  Whenever I double-click to open an executable on the desktop (.exe, .bat, etc.), or a shortcut on the desktop that points to an executable, the "Security Warning" pops up and asks me "Are you really sure you want to open that? Stuff from the Internet is dangerous!" I don't usually mind this warning and don't want to disable it globally, but now I'm getting it for any executable on the desktop, even ones that I didn't download from the Web and don't have the Mark of the Web alternate data stream. (That is, streams -d * shouldn't and doesn't help.) This started fairly recently, but I can't really point to anything I did that triggered it. It only occurs in one user account on the machine; the other account doesn't have this problem. Running System Restore didn't help. How can I fix the problem and make the pop-up warning appear only when it's supposed to?

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• DNS server at router level vs. computer level

  - by Craig

  I've three questions. Is it better/faster/optimal to set up your server's preferred and alternate DNS servers in your OS's network settings or in your router settings? Will it cause problems if it is set up in both places, both pointing to the same IPs? I am running Windows and I have my network assign a static IP to one of my computers. This doesn't allow me to obtain the DNS server addresses from my router automatically. Is there an IP I can put in that will cause it to take the DNS server addresses from the router?

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• Move MySQL database while instance is online

  - by Mike Scott

  I have a MySQL instance containing a number of databases, one of which is an archive database (although using the INNODB rather than ARCHIVE storage engine) that is not queried or written to in normal operation. The data filesystem is filling up and I'd like to move the archive database's data directory to a different filesystem (and then symlink it back, obviously). If there are no SQL statements attempting to query or update the data during the move, can I safely do this while the MySQL instance and the other databases stay online and in use? I plan to rsync the database directory to the new filesystem, then rename the old one on the original filesystem to something different and create the new symlink. lsof reports that MySQL does have the .ibd files open, so presumably it would have to reopen them.

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