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• vsFTPd and iptables - how to configure them in CentOS 5.5?

  - by Vincenzo

  I've installed vsFTPd in CentOS 5.5, on TWO servers, and added this rule to their iptable-s: -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT Looks like this is not enough, since when I'm trying to upload a file from one server to another, I'm getting this result (IP address is masked): # ftp 99.99.99.99 Connected to …com (99.99.99.99). 220 (vsFTPd 2.0.5) Name (99.99.99.99:root): vinny 331 Please specify the password. Password: 230 Login successful. Remote system type is UNIX. Using binary mode to transfer files. ftp> ls 227 Entering Passive Mode (99,99,99,99,107,74) ftp: connect: No route to host I've found a few articles in the net about the second rule I have to add to iptables, but I didn't find the right syntax for it. Could you please help?

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• Why does Apache ignore my Directory block?

  - by Codemonkey

  I just moved my projects into a new workstation. I'm having trouble getting my Apache installation to acknowledge my .htaccess files. This is my /etc/apache2/conf.d/dev config file: <Directory /home/codemonkey/dev/myproject/> Options -Indexes AllowOverride All Order Allow,Deny Deny from all </Directory> I know the config file is being included by Apache because it complains if I put erroneous syntax in it (Action 'configtest' fails). My project is reachable through Apache by a symlink in the /var/www directory. The server is running with my user and group, so it has my permissions. My entire dev folder has permissions set to 770 recursively. Despite all this, I'm still getting an indexed display of my project folder when I visit http://localhost/myproject. Why isn't the above config making it impossible to view the folder in the browser?

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• Long string insertion with sed

  - by Luis Varca

  I am trying to use this expression to insert the contents of one text file into another after a give string. This is a simple bash script: TEXT=`cat file1.txt` sed -i "/teststring/a \ $TEXT" file2.txt This returns an error, "sed: -e expression #1, char 37: unknown command: `M'" The issue is in the fact that the contents of file1.txt are actually a private certificate so it's a large amount of text and unusual characters which seems to be causing an issue. If I replace $TEXT with a simple ASCII value it works but when it reads the large content of file1.txt it fails with that error. Is there some way to carry out this action? Is my syntax off with sed or my quote placement wrong?

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• Decentralized synchronized secure data storage

  - by Alberich

  Introduction Hi, I am going to ask a question which seems utopic for me, but I need to know if there is a way to achieve what I need. And if not, I need to know why not. The idea Suppose I have a database structure, in MySql. I want to create some solution to allow anyone (no matter who, no matter where) to have a synchronized copy (updated clone) of this database (with its content) Well, and it is not going to be just one synchronized copy, it could (and should) be a multiple replication (supposing the basic, this means, for example, ten copies all over the world) And, the most important thing: It must be secure. By secure I mean only real-accepted transactions will be synchronized with all the others (no matter how many) database copies/clones. Note: Since it would be quite difficult to make the synchronization in real-time, I will design everything to make this feature dispensable. So it is not required. My auto-suggestion This is how I am thinking to manage it: Time identifiers and Updates checking: Every action (insert, update, delete...) will be stored as the action instruction itself, associated to the time identifier. [I think better than a DATETIME field, it'll be an INT one, with the number of miliseconds passed from 1st january 2013 on, for example]. So each copy is going to ask to the "neighbour copy" for new actions done since last update, and execute them after checking they are allowed. Problem 1: the "neighbour copy" could be outdated too. Solution 1: do not ask just one neighbour, create a random list with some of the copies/clones and ask them for news (I could avoid the list and ask ALL the clones for updates, but this will be inefficient if clones number ascends too much). Problem 2: Real-time global synchronization is not active. What if... Someone at CLONE_ENTERPRISING inserts a row into TABLE. ... this row goes to every clone ... Someone at CLONE_FIXEMALL deletes this row. ... and at the same time, somewhere in an outdated clone ... Someone at CLONE_DROPOUT edits this row (now inexistent at the other clones) Solution 2: easy stuff, force a GLOBAL synchronization before doing any new "depending-on-third-data action" (edit, for example). This global synch. will be unnecessary when making an INSERT, for instance. Note: Well, someone could have some fun, and make the same insert in two clones... since they're not getting updated in real-time, this row will exist twice. But, it's the same as when we have one single database, in some needed cases we check if there is an existing same-row before doing the final action. Not a problem. Problem 3: It is possible to edit the code and do not filter actions, so someone could spread instructions to delete everything, or just make some trolling activity. This is not a problem, since good clones will always be somewhere. Those who got bad won't interest anymore. I really appreciate if you read. I know this is not the perfect solution, it has possibly hundred of holes, but it is my basic start. I will now appreciate anything you can teach me now. Thanks a lot. PS.: It could be that all this I am trying already exists and has its own name. Sorry for asking then (I'd anyway thank this name, if it exists)

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• Configuring htaccess to show authentication prompt only for subdomain

  - by Philipp Lenssen

  How do I write the htaccess so that it will only require authentication when on admin.example.com, but not on www.example.com (like by using some if-else clause)? Background: I have a site running in two modes: The admin mode should be reached at something like admin.example.com, whereas the normal mode would be www.example.com -- but both should point to the same directory & scripts within them (the scripts then turn on certain editing features by checking if the script is accessed from the admin subdomain). Edit: I can now see this has been asked and answered at StackOverflow, though I can't get the top answer to work for me...

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• SSH + MysqlDump Remote Backup Script

  - by bundini

  I'm trying to issue a remote mysqldump command, redirect stdout to a dmp file, then tar that up. I'm a bit confused as to how to do the redirection bits over ssh: i.e. ssh [email protected] mysqldump $dbname -u admin -p > dbdump.dmp && tar cvzf dbdump.tar.gz dbdump.dmp Issues: 1) I'm not providing the password because I want it to prompt me. Will an ssh remote command deal with this? 2) What's the deal with the syntax? Do I want to use quotations, or don't I? What happens with the redirects and pipes? Do those have to be escaped or formatted in some special fashion.

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• EC2 Apache Server not reflecting changes to PHP files

  - by Josef van Niekerk

  We're running a Laravel application on an Amazon EC2 server with Apache installed. I've noticed on multiple occasions, that the server doesn't respond to changes in PHP files, even after restarting Apache. For example, if I edit a file that I'm accessing through a URL, and I break the syntax, I don't even get a PHP exception thrown. This is really strange, and has been sticking its head out more frequently these days. Is it possible Apache is caching the PHP files somewhere? Opcode caching perhaps?

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• Serving Compressed Files Amazon vs Lightty

  - by tike

  We are currently using amazon CloudFront to serve css and according to Amazon itself, Amazon CloudFront can serve both compressed and uncompressed files from an origin server. But while i check compression it shows everything fine in origin server but it shows notcompressed checking in the link with cloudfront. e.g. http://www.port80software.com/tools/compresscheck.asp?url=http%3A%2F%2Fimgsrv.mydomain.com%2Fen-UK%2Fsomething.css it would result with Compression status: (gzip) while with cloudfront http://www.port80software.com/tools/compresscheck.asp?url=http%3A%2F%2hereisit.cloudfront.net%2F%2Fsomething.css Compression status: Uncompressed Origin server is running lighttpd with mod_deflate however, allowed config is: deflate.allowed_encodings = ("bzip2", "gzip", "deflate") [i would think, putting extra allowed encoding wont affect as such.] Here i am clueless, what is the real issue.

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• cron job executing every minute but should be setup to execute every 4 hours.

  - by Frank V

  Note: I've viewed cron: can’t lock /var/run/crond.pid, otherpid may be 3759 but I believe my question is different (but with the same resulting problem.) I'm very new to cron. I setup a script to run a python script every minute to test that everything was working. I did use crontab to accomplish this. It worked great, so I wanted to switch it to run every 4 hour. I changed my * * * * * {...} to * */4 * * * {...} but the job is continues to run every minute. It's been like this for the last hour or so. When I attempt to run cron restart (thinking that would solve the problem), I receive the following error message: cron: can't lock /var/run/crond.pid, otherpid may be 2311: Resource temporarily unavailable Is my cron syntax wrong? And why might I not be able to restart cron?

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• IPtables rate-limit, What are the differences between modules? Recent, Limit

  - by TechZilla

  I am doing some rate-limiting with IPtables, and i'm not sure if I should use "Recent" or "Limit" What are the differences between the two? If they both achieve the same result, which one has better performance? I would like to know, regardless if any difference would be perceivable. I am looking to ACCEPT if under limit, and REJECT if over. I'm not interested in thus bandwidth throttling, I don't want a queue. I don't need any syntax examples, both have ample use examples online. I have also used Limit in the past. I appreciate any responses.

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• show php error message on IIS 7

  - by Max

  I am using IIS as a webserver on my development machine for PHP webdevelopment. Or at least, I am trying to. When there is a syntax error in a PHP script and I open that file in my webbrowser, I just get an 503 "internal server error" and the default IIS error page for this error. Some browsers dont open that file at all, possibly because of the 503 HTTP Response Header. I would like IIS to act in that case just like the apache webserver: display the PHP file with the error anyway, so that the error message gets printed out. How can this be done? EDIT: PHP settings: display_errors is on and error_reporting is set to E_ALL

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• Using Ruby on share web hosts

  - by Parhum

  We are developing a Wordpress theme and we are going to publish it on themeforest.com. We are using Sass(scss Syntax) as our CSS Preprocessor and we need to compile it on server side. We have two solutions: Use phpsass which is a php script(but it has some bugs) Use Ruby Compiler which most of wordpress plugins use this I noticed that plugins which use Ruby need to have PHP proc_open function enabled on server. My question is what are Pros and Cons of using Ruby compiler on servers? and are most of shared web hosts support Ruby and have PHP proc_open function enabled by default?

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• Installing ruby 1.9.1 on OS X with RVM, getting error I can't make sense of

  - by Pselus

  I'm trying to update my ruby install on Leopard to at least 1.9.1. I found a tutorial that tells me how to do it with RVM and I get as far as downloading, configuring and compiling the version I want, but during the compile I get errors. When checking the make.error.log file this is the message I get: [2010-11-07 13:43:44] make main.c: In function ‘objcdummyfunction’: main.c:19: warning: implicit declaration of function ‘objc_msgSend’ main.c: At top level: main.c:19: warning: ‘objcdummyfunction’ defined but not used eval.c: In function ‘ruby_cleanup’: eval.c:139: warning: passing argument 1 of ‘ruby_init_stack’ discards qualifiers from pointer target type gc.c: In function ‘garbage_collect_with_gvl’: gc.c:597: warning: cast from pointer to integer of different size w: illegal option -- L usage: w [hi] [user ...] make: [libruby.1.9.1.dylib] Error 1 (ignored) readline.c: In function ‘username_completion_proc_call’: readline.c:1159: error: ‘username_completion_function’ undeclared (first use in this function) readline.c:1159: error: (Each undeclared identifier is reported only once readline.c:1159: error: for each function it appears in.) make[1]: *** [readline.o] Error 1 make: *** [mkmain.sh] Error 1 I have no idea what any of that means. Help?

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• Windows Server 2003 (as workstation) unable to write to Samba fileshares

  - by remyhorton

  Setup is a Samba fileserver under Linux, which i am trying to access from a Windows Server 2003 box which has been reconfigured as a workstation. I can log onto the fileshares and can copy/delete files, but trying to open a file then write to it fails. Renaming files also fails with an error about requiring a filename. Drag/dropping files onto Xemacs gives me a message about copying from the network zone, and once open the file is read-only. Any ideas of what is wrong? I suspect it is a miscommunication of security details, as folder security options are all unchecked (checking them has no effect). I know it is not a problem with Samba itself, as Window2000, WindowsXP, and Nautulas (under Linux) can all access/edit fileshare files fine using the same userid/password. I am not using domain logins.

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• "Fuzzy" Display Problems on New OpenSUSE 11.3 Install

  - by Kryten

  Hi, I have a old Desktop that has a new installation of OpenSUSE 11.3 on it. To get straight to the point, whenever I try to start-up OpenSUSE, my display goes "fuzzy" (almost like a badly tuned TV) and sometimes (not always) my monitor goes black and says "Out of Range: 15.6kHz/49Hz": I assumed that this was a driver problem, so I download the drivers from nvidia and ran the shell script, completed and rebooted. Then OpenSUSE failed to boot with something like "nscd failed to start". At that point I decided to re-install and I did, but this time I tried un-checking "Automatic Configuration" to see if that helped. Got through the install and still have a problem. Unfortunately, my Linux troubleshooting skills are non-existent, so has anyone got any ideas on what could be the problem (is it the display driver?) and how I can fix the problem?

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• java -version doesn't write to stdout?

  - by Zárate

  Hi there, Either I'm doing something silly or Sun is. How come something like: java -version > version.txt Still prints out to stdout and leaves version.txt empty? I'm checking out the exit code, and it's still 0, so is not that's writing to stderr. I need this because I'm building a test-environment tool and want to check if the version of Java is adequate, I was planning to catch that version output, but now I'm stuck. I'm on OS X Leopard, Java version 1.6.0_20. Any ideas? Cheers, Juan

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• Port Redirection on Mac OS X Lion

  - by Andreas

  I have tried to solve this issue using pf but with no luck. Basically, I am trying to redirect incoming port 443 traffic to port 22. I have tried to set up a rule in a file and load it in pf but I get syntax error. Can anyone with more experience with pf provide some insight? Here's what I've attempted: pass in on en1 proto tcp from any to any port 443 rdr-to 127.0.0.1 port 22 and pass in quick proto tcp to port 443 rdr-to 127.0.0.1 port 22 I've been able to do this in MacOSX Snow Leopard with ipfw: sudo ipfw add 1443 forward 127.0.0.1,22 ip from any to any 443 in but it doesn't work in Lion (it gives me an Invalid Argument error).

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• What are the advantages of DKIM?

  - by duff

  After making my server sign outgoing email I started to wonder what the benefits are. This is the opposite of a previously asked question. Naively I see two benefits: We can throw away all emails which don’t carry a valid signature: Wrong! Mail forwarders (like Mailman) will produce emails from someone at «domain which signs» which are not signed correctly (in their forwarded shape). We can skip spam checking on signed email: Wrong! A spammer can send a single email through e.g. gmail.com and then resend that email as-is (w/o changing headers) to a million people. So what are the selling points of DKIM?

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• SVN command that returns wether a user has a valid login for a repository?

  - by Zárate

  Hi there, I'm trying to find out an SVN command that would return some kind of true / false value depending on wether the user running it has access to a given repository. I'm building a tool for automated deployment and part of the process is checking out the code from the SVN repository. I'd like to find out if the user running the tool has a valid login already. If there's no valid login, just show a message and exit the tool (handling the SVN login internally is not an option at the moment). Plan B would be parsing the file in svn.simple looking for the repo URL, but thought about asking first. Thanks, Juan

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• Dovecot, POP3 and Gmail

  - by Eric J.

  I setup Postfix and Dovecot on a new Ubuntu box following these directions. From a client machine, I validate that POP3 seems to be working telnet mydomain.com 110 +OK Dovecot ready. USER [email protected] +OK PASS mypassword +OK Logged in. quit +OK Logging out. However, when trying to configure Gmail on the same client to retrieve email via POP3, I get the error Server denied POP3 access for the given username and password. Server returned error: "Login failed." I carefully confirmed that Gmail is configured to use the same POP Server, Port, Username and Password I used when checking the connection with telnet. What could be causing Gmail to get a "Login failed" message?

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• lighttpd silently stops logging

  - by Max Cantor

  I'm on a Slicehost 256MB VPS with Ubuntu 9.04 (Jaunty). lighttpd is the only web server process running; it listens on port 80. My lighttpd.conf can be found here. I'm using Ubuntu's default logrotate setup for lighty. At seemingly random times, lighttpd will stop logging. It is not correlated with log rotation--that is, the errors do not occur when logrotate kicks in. What happens is, I will verify that the server is serving files by hitting a URL with my browser, and I will verify that it is not logging by checking access.log and seeing that the GET request I just made is not there. Using init.d to restart the process starts logging again, without truncating or rotating the log file. That is, new requests will be logged at the end of the existing access.log file. There are no cron jobs running on this box. Any ideas?

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• Problems executing check_mysql plugin

  - by Brian

  I'm attempting to test out the check_mysql plugin for Nagios using the command line. It works great when I'm just checking localhost but when I try to specify a different server (using the -H argument) I keep getting the following error message: CRITICAL - Unable to connect to mysql://nagios_user@{remoteServerHostname}/ - Access denied for user 'nagios_user'@'{localServerHostName}' (using password: YES) It looks like it's trying to connect to the database using the localhost server even though I've specified a different host name. I've already set up this user on the remote database and they have correct permissions. I'm just trying to figure out why the script keeps inserting the localhost server name instead of the remote one.

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• How do I use memmap to reserve memory on boot?

  - by alexl

  Ive got a laptop with some corrupted ram addresses, so I'm trying to use memmap to reserve them before linux boots up. Ive been trying to use memmap=10M$1024M' as a kernel boot option, but linux crashes (with no errors) and restarts. If I use a different syntax for memmap likememmap=1023M@0M` it boots fine. Do I have to specify a certain size block to reserve or could my kernel version not support reserving memory with memmap? Maybe I'm better off using memmap=exactmap, and if so, could somebody point me to a good faq on how to use it?

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• Installing qt headers and libraries

  - by ant2009

  Hello, Ubuntu 9.10 2.6.31-20-generic I am trying to install some software. When I do the ./configure. I get the following error: checking for Qt... configure: error: Qt (>= Qt 3.0.2) (headers and libraries) not found. Please check your installation! So I install the following package thinking this would solve the problem. sudo apt-get install libqt4-dev I was thinking that the libqt4-dev would install the headers and libraries. However, I am still getting the same problem. Any ideas? Many thanks,

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• How do i mitigate DDOS attacks on static servers?

  - by acidzombie24

  Here is a slightly different take on DDOS attacks. Rather than a server with dynamic content being attack i was curious how to deal with attacks on servers with STATIC CONTENT. This means cpu tends to not be an issue. Its either bandwidth or connection problems. How would i mitigate a DDOS attack knowing nothing about the attacker (for example country, ip address or anything else). I was wondering is shorting the timeout and increasing amount of connections is an acceptable solution? Or maybe that is completely useless? Also i would limit the amount of connections per IP address. Would the above help or be pointless? Keeping in mind everything is static checking for multiple request of the same page (html, css, js, etc) could be a sign of a attack. What are some measures i can take on a static content server?

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