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• chroot for unsecure programs execution

  - by attwad

  Hi, I have never set-up a chroot-jailed environment before and I am afraid I need some help to do it well. To explain shortly what this is all about: I have a webserver to which users send python scripts to process various files that are stored on the server (the system is for Research purpose). Everyday a cron job starts the execution of the uploaded scripts via a command of this kind: /usr/bin/python script_file.py All of this is really insecure and I would like to create a jail in which I would copy the necessary files (uploaded scripts, files to process, python binary and dependencies). I already looked at various utilities to create jails but none of them seemed up-to-date or were lacking solid documentation (ie. the links proposed in How can I run an untrusted python script) Could anyone guide me to a viable solution to my problem? like a working example of a script that creates a jail, put some files in it and executes a python script? Thank you very much.

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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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• Moving a lot of small files between servers using rsync

  - by Adirael

  Hello guys, I'm moving a lot of files (about 2 millions) between two servers on different locations using rsync over ssh, it seems to work fine but I just realised I'm losing some files on the process. I got server 1, with the original data, and server 2, with the copy. Server 1 runs CentOS 5 and Server 2 runs on Ubuntu 10. I'm doing the transfer on the Server's 2 command line like this: rsync -e ssh -avzn usr@server1:/remote/path /local/path The first file movement I did using tar, but I didn't though of piping it through ssh and it failed cause the disk on server 1 was almost full, so I transfered it anyways (it was about 200GB) and got about 80% of the files. Then I piped another tar with the rest of the files (they're in folders, I got 100 folders with about 30 subfolders each, with files inside) and now I got everything on server 2. I wanted to be sure, so I my two options are getting the md5sum of all the files and check them or running an rsync on server 2 against server 1, that's what I did. It got some missing stuff and now it says there's nothing more to do (DRY RUN). But I got at least two files that are missing inside a subfolder. I ran that same rsync on that folder, but still dry run. Am I doing something wrong? Thanks, and sorry for the wall of text.

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• How to search a text file for strings between two tokens in Ubuntu terminal and save the output?

  - by Blue

  How can I search a text file for this pattern in Ubuntu terminal and save the output as a text file? I'm looking for everything between the string "abc" and the string "cde" in a long list of data. For example: blah blah abc fkdljgn cde blah blah blah blah blah blah abc skdjfn cde blah In the example above I would be looking for an output such as this: fkdljgn skdjfn It is important that I can also save the data output as a text file. Can I use grep or agrep and if so, what is the format?

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• CPanel: Every url is being redirected to http://:2083

  - by Frank

  On my cpanel server, I restored about 50 accounts from crashed cpanel server. All of the sites were working fine, but suddenly without changing anything, every site started to get redirected to url "http://:2083/"., There is nothing in logs, no errors. when i do wget it says: wget grinfeld.com.br --2012-09-04 13:18:23-- http://grinfeld.com.br/ Resolving grinfeld.com.br... 198.101.221.254 Connecting to grinfeld.com.br|198.101.221.254|:80... connected. HTTP request sent, awaiting response... 301 Moved Location: https://:2083/ [following] https://:2083/: Invalid host name.

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• How can i get log messages from LAMP server on Ubuntu 10.04?

  - by meyosef

  How can I get log messages from LAMP server on Ubuntu 10.04? Should I install some good program on Ubuntu for that purpose? Thanks

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• How to record desktop session with sound on Moblin?

  - by Moblin Newbie

  I have tried to record my desktop session with sound on a netbook running Moblin, but I can't seem to be able to record sound. xvidcap just says error accessing /dev/dsp. Are there some options I should pass to xvidcap? Should I use some other recording application? Update: I am using the latest xvidcap (1.1.7) and have read the FAQ. Unfortunately Moblin' gnome-volume-control looks nothing like what is linked to from the xvidcap FAQ; there is no way to to set or even look at the details the screenshot shows, as far as I know. alsamixer shows pulseaudio is used, if that gives anyone any clues. The device is Acer Aspire One.

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• Symlink across local volumes in webroot?

  - by geerlingguy

  I am looking for a good short-term solution to storage space concerns on my website. Currently, I have all uploaded files (flash video, images, etc.) inside the 'files' directory in my web root (/home/account/public_html/files). That directory is located on my high-speed main hard drive (a 15k SCSI drive). I have another drive with much more capacity, but spinning at 10k rpm (so still fast, but not as good for random reads/writes as the main drive. The entire drive is mounted at /backup Right now I'm just using it as a backup volume. I would like to create a symlink from my /home/account/public_html/files folder to /backup/files, and have all files reside on the second drive. However, if someone accesses a file at http://www.example.com/files/filename.jpg, would it still work if I symlinked to the second drive? (Basically, would Apache/PHP automatically know to follow the symlink for that directory?).

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• How do I enable a stick pointing device in Ubuntu?

  - by SjB

  How do I enable/disable a stick pointing device in Ubuntu (9.10)? How can I configure clicking and scrolling with the stick pointer? (I can't click with the stick and scroll the page.)

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• Need advice in setting up server. fastCGI, suExec, speed, security, etc.

  - by lewisqic

  I am running my own dedicated server with centOS 5 and WHM/cPanel. I would like to configure my server to meet my needs but I need a little help. It will only be my own websites being run on this server. I'm still a little green when it comes to server administration so please forgive my ignorance. What I Would Like to Have: I need some public directories to be writable (for user image uploads and things like that) but I don't want those directories to have 777 permissions. I need individual accounts to have the ability to set custom php settings for their own account without affecting other accounts, whether through a php.ini file or through .htaccess or any other method. I would like things to run as fast as possible, whether that means using a php optimizer or cacher, such as eaccelerator or xcache or anything else. I need things to be as secure as possible. Here Are My Questions What should I use for my php handler? DSO? CGI? fastCGI? suPHP? Other? Should I be using suEXEC? What are the benefits or downfalls of this? What php optimizer/cacher is best to use? Are there any other security tips I need to know about all of this? I'd appreciate any advice or direction that can be offered. Thanks!

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• Wrap app with dynamic libraries into one large static app

  - by progo

  I have an old program that kind of depends on older dynamic libraries. They tend to get upgraded easily with distro's updates. I figured that there would be a script with using ldd that would gather the libs needed and create one bigger, statically linked application that wouldn't break so easily. If I could do this, alot of older KDE libraries could be removed from my system and easen my life. Thanks!

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• df says disk is full, but it is not

  - by Chris

  On a virtualized server running Ubuntu 10.04, df reports the following: # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 7.4G 7.0G 0 100% / none 498M 160K 498M 1% /dev none 500M 0 500M 0% /dev/shm none 500M 92K 500M 1% /var/run none 500M 0 500M 0% /var/lock none 500M 0 500M 0% /lib/init/rw /dev/sda3 917G 305G 566G 36% /home This is puzzling me for two reasons: 1.) df says that /dev/sda1, mounted at /, has a 7.4 gigabyte capacity, of which only 7.0 gigabytes are in use, yet it reports / being 100 percent full; and 2.) I can create files on / so it clearly does have space left. Possibly relevant is that the directory /www is a symbolic link to /home/www, which is on a different partition (/dev/sda3, mounted at /home). Can anyone offer suggestions on what might be going on here? The server appears to be working without issue, but I want to make sure there's not a problem with the partition table, file systems or something else which might result in implosion (or explosion) later.

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• Do best-practices say to restrict the usage of /var to sudoers?

  - by NewAlexandria

  I wrote a package, and would like to use /var to persist some data. The data I'm storing would perhaps even be thought of as an addition for /var/db. The pattern I observe is that files in /var/db, and the surrounds, are owned by root. The primary (intended) use of the package filters cron jobs - meaning you would need permissions to edit the crontab. Should I presume a sudo install of the package? Should I have the package gracefully degrade to a /usr subdir, and if so then which one? If I 'opinionate' that any non-sudo install requires a configrc (with paths), where should the package look (presuming a shared-host environment) for that config file? Incidentally, this package is a ruby gem, and you can find it here.

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• Changed array composition, mdadm --detail still shows the old array size

  - by Prody

  I have a machine with 8 disks. I installed it with my hoster's install automation (it's OVH, I don't have physical access to it). The machine installed correctly, but it made an array that I wanted to change. It created a raid5 array across 5/8 disks and I've changed it to raid10 across 8 disks. I've done this by first --stopping the old array and then --creating the new array. It warned me that a previous array was there, but I chose to continue. So it created the array, spent 10ish hours syncing it and now that it's ready I get this strange behavior: When I fdisk p on it, I see the correct size. But when I mdadm --detail it I see the old array's size even tho I get the new composition and level. When I try to pvcreate on it, i get the old size again for some reason. Did I have to do something else? Did I miss something?

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• How do I map a network drive in Ubuntu? I want to save my Firefox downloads directly in the mapped n

  - by NJTechie

  I work in an environment wherein files are exchanged over email which are then processed into databases. In Windows, mapping a network drive and storing files directly to a folder in the network drive from Firefox/Chrome downloads is a breeze. How to achieve the same in Ubuntu? I don't see the SFTP'ed drive/directory as options in Firefox- Downloads setup. Thanks in advance!

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• How do I map a network drive in Ubuntu? I want to save my Firefox downloads directly in the mapped n

  - by NJTechie

  I work in an environment wherein files are exchanged over email which are then processed into databases. In Windows, mapping a network drive and storing files directly to a folder in the network drive from Firefox/Chrome downloads is a breeze. How to achieve the same in Ubuntu? I don't see the SFTP'ed drive/directory as options in Firefox- Downloads setup. Thanks in advance!

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• Configure New Server for .htaccess

  - by Phil T

  I have a new LAMP CENTOS 5 server I am setting up and trying to copy the configuration from another web server I have. I am stuck with what I think is a mod_rewrite problem. If I go to http://old-server.com/any_page_name.php it correctly routes through some handling code in index.php and shows me a graceful "Page Cannot Be Displayed" message. But if I go to http://new-server.com/any_page_name.php I get an ugly Apache 404 Not Found error message. I looked in both httpd.conf files and they both have only one reference to mod_rewrite. LoadModule rewrite_module modules/mod_rewrite.so So it seems like that should be fine. At the bottom of httpd.conf I have the code: <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/html ServerName new-server.com ErrorLog logs/new-server.com-error_log CustomLog logs/new-server.com-access_log common </VirtualHost> Then in the root of /var/www/html I have the exact same .htaccess file that looks like this: RewriteEngine on Options +FollowSymlinks RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . index.php [L] ErrorDocument 404 /page-unavailable/ <files ~ "\.tpl$"> order deny,allow allow from none deny from all </files> So I don't see why the page load at old-server.com works fine while new-server.com doesn't route through index.php like I want it to do. Thanks.

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• Why does deleting from the command line take significantly less time than from a GUI?

  - by Jordan Plahn

  So this is probably the dumbest question you'll read today, but it's something I just wondered about as I was deleting a dozen or so images from my computer. With a quick rm -rf command on the directory's contents, all the images were gone in a snap. When I drag the same dozen or so images to a trash can/recycle ban, it takes sometimes 10 seconds or more. Now I'm sure some of it comes from the overhead of the GUI and such, and some of it may be the fact that the file still "exists" in some form if it's put into the recycle bin, but is there anything else that accounts for such a huge time disparity? Are "rm" and "delete" just such fundamentally different commands so I'm trying to compare apples and oranges? Enlighten me, please!

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• aufs user permissions

  - by user56395

  Anyone know why this doesn't work? Is this user error, AUFS feature or bug maybe: rac@tecraS1:~/tmp$ mkdir orig tmp au rac@tecraS1:~/tmp$ sudo mount -t tmpfs none tmp rac@tecraS1:~/tmp$ sudo chown -R rac tmp rac@tecraS1:~/tmp$ echo hello > orig/hello rac@tecraS1:~/tmp$ sudo mount -t aufs -o br=tmp:orig none au rac@tecraS1:~/tmp$ ls -al au total 8 drwxrwxrwt 4 rac root 100 2011-01-06 13:53 . drwxr-xr-x 5 rac rac 4096 2011-01-06 13:52 .. -rw-r--r-- 1 rac rac 6 2011-01-06 13:53 hello rac@tecraS1:~/tmp$ rm au/hello rm: cannot remove `au/hello': Operation not permitted rac@tecraS1:~/tmp$ Seems the aufs files were created as root and user has no access to them: rac@tecraS1:~/tmp$ sudo rm au/hello rac@tecraS1:~/tmp$ ls -al tmp total 4 drwxrwxrwt 4 rac root 120 2011-01-06 13:53 . drwxr-xr-x 5 rac rac 4096 2011-01-06 13:52 .. -r--r--r-- 2 root root 0 2011-01-06 13:53 .wh.hello -r--r--r-- 2 root root 0 2011-01-06 13:53 .wh..wh.aufs drwx------ 2 root root 40 2011-01-06 13:53 .wh..wh.orph drwx------ 2 root root 40 2011-01-06 13:53 .wh..wh.plnk rac@tecraS1:~/tmp$ OS is the latest Lucid with 2.6.35-23 stock kernel. No idea about aufs version. Using sudo chown -R rac tmp/.wh* fixes the problem. Thanks for looking.

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• How do I run vino-server without a monitor attached in Ubuntu 10.04

  - by Ole

  I just upgraded to Ubuntu 10.04 yesterday on a headless home server. I use the server for a variety of purposes, and what I don't know how to do via SSH I've alway been able to do through VNC. However, since the upgrade vino-server will no longer run if there isn't a monitor attached. Before it used to start up without a problem. Even by attempting to run the server via SSH gives me a "could not load display" error. Summary: I need to get vino-server running at boot time on a server with Ubuntu 10.04, without a monitor attached.

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• Corosync - stopping the service crashes the server

  - by Antipop

  I am trying to set up a test cluster on a Xen Server with 2 paravirtualized CentOS 5.4 machines. I am using Pacemaker+Corosync, and following the instructions found at http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf and other sites. Anyway, when I try to manually stop the corosync service, about 80% of the times the whole VM locks up with the message "Waiting for corosync services to unload" and I am forced to shut the machine down manually. For the remaining 20%, the VM keeps responding and adds dots to the above message, but it won't actually stop the service. There aren't many resources on the internet about this particular error. Any ideas about this? Thanks in advance.

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• Do background processes get a SIGHUP when logging off?

  - by Massimo

  This is a followup to this question. I've run some more tests; looks like it really doesn't matter if this is done at the physical console or via SSH, neither does this happen only with SCP; I also tested it with cat /dev/zero > /dev/null. The behaviour is exactly the same: Start a process in the background using & (or put it in background after it's started using CTRL-Z and bg); this is done without using nohup. Log off. Log on again. The process is still there, running happily, and is now a direct child of init. I can confirm both SCP and CAT quits immediately if sent a SIGHUP; I tested this using kill -HUP. So, it really looks like SIGHUP is not sent upon logoff, at least to background processes (can't test with a foreground one for obvious reasons). This happened to me initially with the service console of VMware ESX 3.5 (which is based on RedHat), but I was able to replicate it exactly on CentOS 5.4. The question is, again: shouldn't a SIGHUP be sent to processes, even if they're running in background, upon logging off? Why is this not happening? Edit I checked with strace, as per Kyle's answer. As I was expecting, the process doesn't get any signal when logging off from the shell where it was launched. This happens both when using the server's console and via SSH.

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• Sniff packets using tcpdump

  - by denisk

  I have a completely noob question. I want to see all packets that come to my computer from particular site (google.com). So I start tcpdump sudo tcpdump -i eth0 host google.com and enter google.com in a browser and hit enter - nothing gets captured. I can't figure out why it happen. What do I do wrong? Edit It appeared that I was listening to the wrong interface. I had changed eth0 to any and it worked. It was ppp1 that needed listening. Thanks for your answers!

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• Apache shuts down from time to time

  - by Dugi

  I'm having trouble with my VPS as it keeps shutting apache down at least twice a day. The server is running on CentOS 6 with the latest apache. By shutting down I mean I have to go into SSH and type in this command in order to bring it up again: /sbin/service httpd start I'm not very good with servers and my host doesn't seem to have a nice customer service. Any help would be appreciated as these unexpected downtimes really know to kill one's mood.

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• Prefork or Worker MPM for amazon xlarge server?

  - by Netismine

  I'm trying to measure would it be better to have prefork or worker mpm apache module for the server I'm working on, which is Amazon X-Large 15 GB memory 8 EC2 Compute Units (4 virtual cores with 2 EC2 Compute Units each) and that will run a Magento website with about 50 active users at once. Site serves a lot of images and about 45 requests per page. Images sometimes hang, so it seems worker would be a better option? Thanks

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