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• nagios-nrpe-unable-to-read-output [closed]

  - by Bill S

  Oracle Linux; Icinga; Nagios plugins I did all the easy steps command runs fine standalone through my normal login; looked at /var/log/messages to see if any clues there Trying to run plugin under nrpe login - cant login don't know password; does this password matter? can I reset it? clone id? Any way to have shell being executed log all commands and output to somewhere? Trying to run this shell script plugin "nqcmd OBIEE plugin for Nagios" from this URL: http://www.rittmanmead.com/2012/09/advanced-monitoring-of-obiee-with-nagios/ I went through script and made sure that everything obvious was set to 755 Any help would be appreciated

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• Compiling to a binary from source

  - by Chords

  I'm using WKHTMLTOPDF on a 64-bit Linux server and I'm running into problems with the version. Seen here: http://code.google.com/p/wkhtmltopdf/downloads/list There's slim pickins when it comes to pre-compiled binaries. I started with version 0.9.9 which has a few bugs. I upgraded to 0.11.0 RC 1 to find a slew of new problems, namely the following: http://code.google.com/p/wkhtmltopdf/issues/detail?id=730 I think 0.10 RC 2 would work, and the thread above suggests compiling from the source has a fix for the error I'm getting, but I don't know how to do that. Can anyone explain how I can create a static binary myself, or would anyone be willing to create and post one for the countless people waiting for this fix?

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• What is the EGG environment variable?

  - by Randall

  A user on our (openSuSE) linux systems attempted to run sudo, and triggered an alert. He has the environment variable EGG set - EGG=UH211åH1ÒH»ÿ/bin/shHÁSH211çH1ÀPWH211æ°;^O^Ej^A_j<X^O^EÉÃÿ This looks unusual to say the least. Is EGG a legitimate environment variable? (I've found some references to PYTHON_EGG_CACHE - could be related? But that environment variable isn't set for this user). If it's legit, then I imagine this group has the best chance of recognizing it. Or, given the embedded /bin/sh in the string above, does anyone recognize this as an exploit fingerprint? It wouldn't be the first time we had a cracked account (sigh).

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• BIOS password and hardware clock problems

  - by Slartibartfast

  I have HP 6730b lap top. I've bought it used and installed (Gentoo) linux on it. BIOS is protected with password, and guy I bought it from said "I've tweaked BIOS from Windows program, it never asked me for password". I've tried to erase password by removing battery, but it's still there. What did get erased obviously is hw clock. This is what hapends: a) I can leave lap top in January 1980 and it works b) I can correct system time, but boot wil fail with "superblock mount time in future" from where I need to manually do fsck and continue boot c) I can correct system time and sync it with hwclock -w but than it will behave as b) and it will reset BIOS time to 1.1.1980 00:00 So I need either a way to bypass a BIOS password (wich after lot of googling seems impossible),a way to persist a clock, or a setup that will enable hw clock in eighties, system clock in present time and normal boot.

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• Webserver security, intrusion detection, and file intregrity

  - by enfield

  I would like to add some type of tracking / alerting on some linux webservers running PHP and Apache. In doing searches I have come across a lot of info from 2006-2009. Would like to revisit things and see what others are doing now. The main purpose here is to track when any files are changed and if so alert me somehow. The same goes for IDS and hopefully something that can reside on same server? Since some of these are small scale projects I would prefer opensource/free solutions that are really effective. Although I would still like to hear of other alternatives if someone has the experience and the cost can be justified.

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• setting nproc in /etc/security/limit.conf prevents ssh login

  - by omry

  I am trying to use /etc/security/limit.conf on Linux (Debian) to limit the number of processes per user. for starters, I tried to limit my own user processes by adding this to /etc/security/limit.conf: omry hard nproc 100 this locked my user out of ssh. I could open new processes (verified with su omry), but could not log into ssh with that user : sshd reported this in it's log: fatal: setreuid 1000: Resource temporarily unavailable also, I am certain my user is not running anything near 100 processes (actually 6). what can be the reason for this?

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• How to increase max FD limit for a daemon process running under a headless user?

  - by Ameliorator

  To increase the FD limit for a daemon process running under a headless user on a Ubuntu Linux machine we did following changes in /etc/security/limits.conf soft nofile 10000 hard nofile 10000 We also added session required pam_limits.so in /etc/pam.d/login. The changes got reflected for all the users who logged out and logged in again. Whatever new processes are starting under those users are getting new FD limits. But for the daemon which is running under a headless user the changes are not getting reflected. what is the way by which the changes can be reflected for the daemon which is running under headless user ?

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• Segfault with rtorrent on Debian Lenny

  - by digital

  Hi, My debian lenny server keeps segfaulting with rtorrent, it happens once every 24 hours. Libcurl has been recompiled to the latest version and it still seems to happen. I'm not the best when it comes to linux server admin but if you require more info about the system I'll try and get it for you. lib/rtorrent are 0.8.5/0.12.5 Any help would be appreciated as I'd like rtorrent up 24/7 Caught Segmentation fault, dumping stack: 0 rtorrent [0x439686] 1 rtorrent [0x43e06a] 2 /lib/libc.so.6 [0x7f73ce780f60] 3 /usr/lib/libcurl.so.4 [0x7f73d04f4431] 4 /usr/lib/libcurl.so.4 [0x7f73d04f47da] 5 /usr/lib/libcurl.so.4(curl_multi_remove_handle+0x341) [0x7f73d050acb1] 6 rtorrent [0x480221] 7 rtorrent [0x482915] 8 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1f95] 9 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1fea] 10 /usr/local/lib/libtorrent.so.11 [0x7f73d02b4cfc] 11 rtorrent [0x48058a] 12 rtorrent [0x439f49] 13 /lib/libc.so.6(__libc_start_main+0xe6) [0x7f73ce76d1a6] 14 rtorrent(_ZNSt8ios_base4InitD1Ev+0x71) [0x40ea99]

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• Dummy HTTP server for debugging

  - by Andrea

  This is more or less the inverse of my previous question. I need to debug some HTTP requests that I am making. Since these requests arise from the use of some external libraries, sometimes I am not sure of what is the actual data I am sending. Is there some dummy server (for Linux) that accepts HTTP requests and just prints them somewhere so that I can inspect them? I would like to be able to see in plain text the full request, like POST /foo HTTP/1.1 Host: www.example.com Accept: text/xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-gb,en;q=0.5 Content-Type: text/plain Content-Length: 11 Hello world

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• Automatically encrypting incoming email

  - by user16067

  I have a small website and would like to encrypt incoming email using gpg. Is there a way to force sendmail to check email and encrypt it if its not already encrypted? I'm using GPG on a linux server. Thanks [added]Someone asked what I hope to accomplish. My intent is for the users of the email to become more familiar with seeing thier own email encrypted and losing that fear of the unknown. The side benefit is that the email can't be looked at later down the road. If the email isn't encrypted on its way in, I'm unable to do anything about it. I'm assuming most email would be nosed around with once its already on my hard drive, so GPG would protect against those issues.

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• What is the difference between /sbin/nologin and /bin/false?

  - by Michael Hampton

  I have often heard it recommended that a user account should be disabled by setting its shell to /bin/false. But, on my existing Linux systems, I see that a great number of existing accounts (all of them service accounts) have a shell of /sbin/nologin instead. I see from the man page that /sbin/nologin prints a message to the user saying the account is disabled, and then exits. Presumably /bin/false would not print anything. I also see that /sbin/nologin is listed in /etc/shells, while /bin/false is not. The man page says that FTP will disable access for users with a shell not listed in /etc/shells and implies that other programs may do the same. Does that mean that somebody could FTP in with an account that has /sbin/nologin as its shell? What is the difference here? Which one of these should I use to disable a user account, and in what circumstances? What other effects does a listing in /etc/shells have?

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• Make own dial-up ISP using broadband connection [on hold]

  - by SkylarMT

  So, I see no reason why this wouldn't be possible. I have a Linux server (a Raspberry Pi to be exact) connected via Ethernet to a broadband ISP. I want to be able to dial a number, have it go through the normal telephone network, onto the Internet via a VoIP provider (I know you can call a Skype user from a landline), to my Raspberry Pi, and then have the Pi connect me to the Internet. I've found guides on making your own ISP, but they all involve a dedicated phone line on the server end. Is there a way to do this with no modem on the server end? I live in an area with a lot of people still on dialup, and if I pull this off I could make some extra money. Thanks!

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• Kickstart virtual console: No 'Shell prompt' at Alt-F2

  - by Stefan Lasiewski

  I am installing Scientific Linux 6.1 via kickstart, and I am trying to debug a problem. According to Tips and tricks for anaconda and kickstart, I should have several virtual consoles available: What the different terminals display Alt-F1 The installation dialog when using text or cmdline Alt-F2 A shell prompt Alt-F3 The install log displaying messages from install program Alt-F4 The system log displaying messages from kernel, etc. Alt-F5 All other messages Alt-F7 The installation dialog when using the graphical installer The Virtual Consoles Alt-F1, F3, F4 & F5 all work and show various logging information. However, the Virtual Console at Alt-F2 does not do anything. I could really use access to the shell prompt (Alt-F2), however there is no Shell prompt available at the second virtual console (Alt-F2). All I have is a blinking '_'. Can I forge Alt-F2 to show me a shell prompt?

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• apache server not working after installing zend server

  - by kamal

  i have apache installed in my redhat 5.3 server machine. and i was trying to install zend server. i installed zend server with install.sh file in directory /var/zend. in my windows machine after installling zend server community edition i was able to access apache server as well as zend server. but in my linux machine localhost displays nothing and localhost:10081 shows zend server. what can i do to run my localhost? or should i seperately install apache?

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• List of MD /Raid/LVM (Devices) = How to mount them without any further information available?

  - by Jens

  Hello Expets, I do not have much skills in linux and installed a system two years ago that I now had to reboot, but it seems I did not automate everything with start-scripts... My Problem: I miss some mountpoints. I have a list of my raids (excerpt:) md3 : active (auto-read-only) raid1 sda6[0] sdb6[1] 97659008 blocks [2/2] [UU] md4 : active (auto-read-only) raid1 sda7[0] sdb7[1] 250099776 blocks [2/2] [UU] and it seems md3 and md4 are NOT mounted. However i do NOT have any entries for them fstab file. What should I do next. I do NOT know which filesystem they have (most likely ext3). =Can I savely try to mount them with (mount -t ext3 /dev/md3 /mnt/mymntpoint) or will the lead to corrupted data, in case they are not ext3? What should I do next (based on the information given above). The goal is to remount these Devices again, but I do not know anything about them anymore... Thank you very much Jens

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• Sending UDP/514 data magically appears in syslog without rsyslog running

  - by ale

  I’m using a programming language without a library to log to rsyslog over UDP. I thought I was going to need to write a library but I discovered something weird. If I send data on UDP/514 with the port open on the server then the data appears in the server’s syslog. rsyslogd isn’t running so syslog isn’t doing this. Data doesn’t get formatted into a syslog message so rsyslogd really isn’t doing this (only raw text enters syslog). Linux must see the data coming in on this port and know that it should go into /var/log/messages? If I do the same on another port (e.g. UDP/515) then nothing appears in the log! What is doing this? Some CentOS feature? The kernel?

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• How to force laptop mode on/off

  - by Vi

  root@vi-notebook:/home/vi# laptop_mode start force Laptop mode enabled, not active How to start laptop mode? It starts successfully when AC adapter is removed, but not by explicit command. The system is GNU/Linux Debian i386 squeeze (not up to date), 2.6.30-zen2-31270-gc7099db-dirty, Acer Extensa 5220. Update: Changed to ENABLE_LAPTOP_MODE_ON_AC=1 in /etc/laptop_mode/laptop-mode.conf, now it is turned on always. But I can't turn it off with laptop_mode stop force, it stays turned on anyway. How do I turn it off again?

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• Measuring cumulative network statistics per user or per process

  - by zsimpson

  I've been googling for hours -- Under Linux I want to know the cumulative bytes sent and received by user or by process over all ip protocols. The best I've found in my searches is that it's possible to use iptables to mark packets for a user, for example: iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner test -j MARK --set-mark 1 It appears that "tc" can then shape traffic with that but I just want the statistic -- I don't want to shape the traffic. I want something like: "user U has transmitted used XMB since time Y". I can't figure out how to get statistics from these marked packets. Also, I've looked at nethogs but they seem to be measuring the instantaneous flow and I need cumulative counts. Anyone have ideas?

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• Using rsync to take backup of folder

  - by Ali

  Hi, I have a server (Linux) with NAS which is mounted as folder "mount" I have website in "public_html" folder. I want to take backup of website in mount folder automatically at certain intervals for e.g. every hour. I read that there is something called "rsync" which is used to make two folders sync. And it doesn't copy all files every time and instead matches if the file has been changed and then only update changed files. How do I use it to make automatic backups? I have root access to server. Thanks

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• Making TT-RSS cache images

  - by Piku

  Due to Google Reader's untimely demise, I've installed tiny-tiny RSS on my Linux machine under Apache 2. It's mostly a good enough replacement and I can at least go back to reading RSS feeds in my web browser at work. Can I configure or hack TT-RSS to cache all the images it finds in its feeds? There is an option when adding a feed, but it doesn't seem to actually do anything. If I view (for example) today's XKCD comic in TT-RSS it still loads the image from the XKCD website. What I want is the image to be cached in TT-RSS and served from there instead.

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• Monit wont start/stop any processes

  - by Vaughan Magnusson

  Hi, I've got monit running on a linux vserver, installed in a custom location /home/user/bin/monit as that is the only suitable location according to the webhost providers. When I installed monit I used ./configure --prefix=/home/user Monit itself runs, and sends me emails of it's activity, and the control file syntax is correct. However, monit cannot seem to start or stop anything - or even run the simplest of scripts. eg. Using 'monit stop all', I try to run the following stop command stop = "/bin/bash /home/user/simple_script.sh" Which fails (and says so in the log). I cant figure out why this is failing, can anyone help with this?

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• Radeon hd 6570 black screen

  - by Sho

  I got some problem with new graphic card. Every time I use AMD Catalyst drivers on Windows or Linux, screen repeatedly goes black. This usually shows u when i open new cards in a browser, resize a window or run a program. Card runs smoothly on basic drivers but this means low resolution. 1940x1080 is native for my monitor so it causes a lot of problems. I've got a 600W Deus G1, so the power is not the problem. Maybe its a silly question, but would going form a vga cable to hdmi help to improve this situation? If not, can it be caused by slow processor or old mainboard? Im getting kinda confused about this whole thing...

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• Automatically updating routing table on server

  - by bramp

  I have a LAN with three routers on it, one connected to the Internet, one VPN router connected to a few remote sites, and a final route connected to a private network (using BGP to get prefix advertisements). On the same LAN I have multiple Linux servers which needs access to the networks behind each router. I have achieved this by configuring static routes on the server, pointing the different network prefixes to the correct router. This has worked well, but every time we connect to a new remote VPN, we have to change all the servers to be aware that the network is now accessible via the VPN, and not via the default Internet route. What I want is a way to automatically update the routes on all of the servers, when the route is added to a routers. Now, I could install Quagga or something similar on all the servers to receive router advertisements, but that seems like overkill. So my question is what is the easiest/simpliest way to update the routing tables on the server automatically, and what protocol is best suited for this purpose. thanks

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• Ways for managing the installation and configuration of various software applications and settings i

  - by EmpireJones

  What are some ways for managing the installation and configuration of various software applications and settings in group of linux development and server computers? Is a set of basic scripts a good means of attack? I was thinking about just having a ton of scripts, such as: setup_dev_env [install|uninstall|reinstall] setup_nfs [...] setup_nfs_share [...] setup_http [...] setup_memcache_node [...] Is there any better method? It would be nice to be able to "upgrade" an installation script too, for example, to change common development settings.

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• Home folder only SFTP connection has limited access

  - by Tomasz Durka

  I have configured sftp access for user using this guide: Linux shell to restrict sftp users to their home directories? I have problem though. I have taken all steps. I have chown'ed root:user the home folder and I set permissions to 755. I can login normally using SFTP, however I can NOT transfer files, can NOT mkdir directories. If I change permissions to 777 it's ok do edit everything. However this is the thing I don't want. Additionally after exiting sftp and reconnecting then connection is reset by peer (due to setting 777). Anyone had similar problem? What I am doing wrong?

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