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  • define variable in linux that can be access in php

    - by sweb
    I add a variable in whole linux varibale in /etc/profile export MYNAME="My Value" how can i access this value in php source code during run via apache web server? in $_SERVER this value doesn't exist. just this keys appear on $_ENV: _ENV["APACHE_RUN_DIR"] /var/run/apache2 _ENV["APACHE_PID_FILE"] /var/run/apache2.pid _ENV["PATH"] /usr/local/bin:/usr/bin:/bin _ENV["APACHE_LOCK_DIR"] /var/lock/apache2 _ENV["LANG"] C _ENV["APACHE_RUN_USER"] www-data _ENV["APACHE_RUN_GROUP"] www-data _ENV["APACHE_LOG_DIR"] /var/log/apache2 _ENV["PWD"] /

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  • Binary diff/patch for large files on linux?

    - by thejh
    I've got two partition images (A and B) and want to use them to create a patch that I can apply on A on another computer in order to get the new B image without flooding the network. I have the following requirements: works on linux can create diffs can use diffs to patch files can handle binary files can handle large files (a few hundred GB should work) no user interaction required (just a console application) ideally, should be able to read from/write to pipes (so that I can pipe into it from a gzip-compressed file and write to one) Does something like that exist?

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  • What (linux) directories are written to most/constantly?

    - by CH2048
    When I read articles on running Linux from a flash drive, many recommend that directories that see many or constant writes be mounted in ram (e.g. as tmpfs). My question is - Which directories will these typically be, and is there any way to monitor disk activity that would show which directories see many writes?

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  • How can I make linux vps to reload if CPU usage is more than 50%

    - by SPnova
    From time to time I have strange problem. My VPS overloads and doesn't request. I have to reboot server by hands, and only after it server works well again. But sometimes several hours pass until I find out that it overload, and all this time my sites are down. Is there any way to make Linux to reload if CPU usage is more than 50%? It would help me a lot.

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  • How to move linux executables to a ramdisk?

    - by alfa64
    i've made a ramdisk this way: mkdir -p /media/ramdisk mount -t tmpfs -o size=512M tmpfs /media/ramdisk/ The reason for this is because i run a lot of node.js scripts and their execution time is very small, but i suspect that the time overhead is because it reloads the node.js executable from disk and destroys it on each subsecuent run. So i think this might be the solution to gain a bit, if not much, performance. How can i move a program like node to the ramdisk and run it from there? The idea is to have a startup script that creates the ramdisk and puts the node files inside of it. Note that i'm currently using fedora 16 for what's it's worth. Thanks in advance.

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  • Resizing an iscsi LUN on an EMC under Linux RHEL 5

    - by niXar
    I expanded a LUN on my SAN (from 30G to 50G), and tried all kind of voodoo but it looks like the system still believes the device is still small, despite showing me the new size alright. # blockdev --getsize64 /dev/sdl 53687091200 # dd if=/dev/sdl skip=$(( 31*1024*1024*1024/512 )) count=1|hexdump -C dd: reading `/dev/sdl': Input/output error The dd line works for blocks below the 30G original size. If I reboot, the problem goes away, but I don't want to since the machine has a dozen VMs running. I tried various magic, such as: iscsiadm -m node -R -I iface0 ... to no avail. Note: I'm not using multipath.

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  • Linux Flash Player with 2 Monitors: always full-screen on primary monitor

    - by CarlF
    My setup at home uses a laptop, with a larger external monitor in addition to the built-in LCD panel, which is primary. I can see the larger monitor from the rest of the room and use it as my TV, for playing DVDs and various types of web video. However, it isn't ideal for Flash video. For instance, if I watch a video from Hulu or any other Flash-based site, I can expand it to full-screen mode. However, no matter which monitor the browser window is on, the full-screen mode is always on the laptop LCD panel, which is both too small and not visible from most of the room. Does anyone know of a way to force the Flash video to play full-screen on the monitor I select instead of the primary? My video chipset is NVidia, using kernel 2.6.31 (Ubuntu). Thanks.

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  • Linux's best filesystem to work with 10000's of files without overloading the system I/O

    - by mhambra
    Hi all. It is known that certain AMD64 Linuxes are subject of being unresponsive under heavy disk I/O (see Gentoo forums: AMD64 system slow/unresponsive during disk access (Part 2)), unfortunately have such one. I want to put /var/tmp/portage and /usr/portage trees to a separate partition, but what FS to choose for it? Requirements: * for journaling, performance is preffered over safe data read/write operations * optimized to read/write 10000 of small files Candidates: * ext2 without any journaling * BtrFS In Phoronix tests, BtrFS had demonstrated a good random access performance (fat better than XFS thereby it may be less CPU-aggressive). However, unpacking operation seems to be faster with XFS there, but it was tested that unpacking kernel tree to XFS makes my system to react slower for 51% disregard of any renice'd processes and/or schedulers. Why no ReiserFS? Google'd this (q: reiserfs ext2 cpu): 1 Apr 2006 ... Surprisingly, the ReiserFS and the XFS used significantly more CPU to remove file tree (86% and 65%) when other FS used about 15% (Ext3 and ... Is it same now?

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  • Different block sizes for partition and underlying logical disk on HP Raid Controller (Linux)

    - by Wawrzek
    Following links collected in this thread I started to check blockdev and found the following output indicating different sizes for partition c0d9p1 and the underlying device (c0d9): [root@machine ~]# blockdev --report /dev/cciss/c0d9 RO RA SSZ BSZ StartSec Size Device rw 256 512 4096 0 3906963632 /dev/cciss/c0d9 [root@machine ~]# blockdev --report /dev/cciss/c0d9p1 RO RA SSZ BSZ StartSec Size Device rw 256 512 2048 1 3906959039 /dev/cciss/c0d9p1 We have a lot of small files, so yes the block size is smaller than normal. The device is a logical driver on an HP P410 raid controller, simple disk without any raid - RAID 0 on one disk to be precise. (Please note that above configuration is a feature not a bug). Therefore, I have the following questions. Can the above discrepancy in the block size affect disk performance? Can I control the block size using hpacucli?

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  • Linux - Help, I'm running out of inodes!

    - by Rory McCann
    I have a filesystem that has lots of small files. Currently about 80% of inodes are used (I checked with df -i), however only 60% of disk space is used. How can I 'increase' the number of inodes? If it was just disk space, I know that I could just increase the size of the disk (this disk is on LVM). If I increase the size of the disk, will that make me have more inodes? I'm willing to grow the filesystem this disk is on, if that'd help.

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  • Loggon to Internet Hotspot from within Linux Terminal

    - by Saif Bechan
    For internet I use a local Hotspot service. I have internet when I start my browser and fill in my username and password. This stays as long as I do not shut down my PC for a while. I run some virtual machines, centos, debian, from the command line. I run these just for small test purposes, nothing special, and security is not an issue for me at all. I want to have these VM's connect directly to the hotspot if this is possible. So they each have there own IP. I have enough hotspot accounts to do so. I can do this with a bridged connection in VMware which works find with a GUI. But I run these OS's from the command line. I only need to know a way how to get the hotspot to validate my credentials. Is there a way of doing this without having a gui.

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  • Toolkit & Habits for Linux Network & System Administration [closed]

    - by slashmais
    I am tasked with the administration of a small office network as well as several workstations running mostly Debian and Ubuntu. There are two servers: one database & print-server, and one backup & file server. Being relatively new to this side of things, knowing enough to help myself to some degree on Linux, I would like to know what software tools and tasks/habits I can use/acquire to learn this field and be effective while doings so. I don't need to know what is the best, just what a newbie sys-admin can use as a starter-pack to learn and use as a base to grow into proper system administration. [edit] What I need is those few basic tools to start with, and the kind of things I need to do regularly, e.g.: which logs to check, when & what to monitor, the kind of 'right' place to start and to which I can ad as I need.

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  • How to document linux server configuration?

    - by Margaret Thorpe
    Hi, I have about 20 linux servers which I need to document the configuration of. I do not mean the detailed configuration of services, but rather user accounts, databases, databases accounts, ip addresses, physical location, SSH port etc. etc. I know all this data is stored in config files, but I want to centralize it all. I am considering just creating a spreadsheet to record this data, but was wondering if there is something better (perhaps a small php/mysql app) which would be more structured and complete than a hacked together spreadsheet. What do you use?

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  • File doesn't exist in Linux although it's located in Terminal

    - by Mazen Ayman
    I'm a bit new to unix/linux environment, but I have a small problem. I'm using "locate" to find the path of a file I need, it gives me the path for it, but the file doesn't exist in that path, like that: locate test1.txt /home/user/test files/text1.txt /home/user/test1.txt~ "test files" directory is where I was keeping the file and I copied it to the home directory once but I deleted it, no idea what it keeps telling me there is still a tmp file for it. it worth mentioning that I used the command: locate test1.txt~ |xargs -n1 rm to remove that tmp file, but maybe that what caused the problem. I tried to show hidden files, and check for temp files, didn't find it either. any clue what happened?

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  • [linux] preventing access in shared hosting

    - by jack
    Hi Linux Admins I set up a small shared hosting that contains some sites. For each site, there is a user. I mean, for abcd.com, I created abcd.com user and put htdocs for web hosting. I have no idea on how to prevent abcd.com from accessing xyzd.com's data. I have chmoded by changing 0 to others permission, which makes access defined by Apache when I view it with browser. How can I secure access? Thanks.

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  • Monitor Windows Terminal Sessions from Linux/Mac

    - by mhd
    I'm writing some scripts to make remote connections to a Windows 2003 server a bit more user-friendly, and in doing this I want to see who's logged in already. In Windows, I could use qwinsta.exe to do this, even for remote servers. So it is exposed somehow, but I couldn't find a matching command line tool for Unix. Lacking such a tool, I could install an ssh server on the machine and call it remotely, parsing the output or write a small service of my own that would expose this via http, if I don't want full-blown ssh access. Do I have to do this, or is there already a tool for querying terminal services remotely?

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  • How can i simulate the production servers in my home for linux VMs [closed]

    - by user31
    I am thinking of making the small simulation of how the big companies run their system in my home environment to get the feeling. I have the server with 8GB ram , quad core processor. I am thinking of following setup if thats [possible because i have not worked with biger companies , so i want to know how can i do that I am thinking of creating 5 virtual machines VM1 will be database server and will have all databases like MySQL , postgreSQL , sqlite , mongodb and Oracle VM2 will be the web server and will have Apache and Tomcat installed VM3 will be the Filse server where i will have all the web sites file VM4 , i am thinking of as main box where i can install ptyon php java j2ee sites but not sure VM5 will have the server 22008 for c# .net applications my main idea is to be able to host the sites in php, python , java j2ee with spring Is my setup ok or i am missing few things. Please guide me with correct setup so that i can learn stuff

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  • Back up Linux environment

    - by joesavage
    I'm currently in the process of installing a bunch of stuff I need and getting setup my Linode that I recently purchased. Being a Linux newbie, I'm doing pretty well - but one small mistake can screw everything up for me. I've currently got apache2 and some other things successfully installed and setup how I want them, and DO NOT want this to be ruined by some newbie mistake. What is the easiest way to backup the actual environment itself so that I can restore the backed up environment (with apache2 and things fully working) if I mess up?

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