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  • All users of a group can edit each others files (Linux)

    - by Xeoncross
    I want anyone in group www-data to have write access to /var/www. For example, if 'a' and 'b' are in group www-data and 'a' creates a file in /var/www - then 'b' will be able to edit it. The problem is that I create files that PHP and Apache can't edit - and they create files I can't edit without sudo. I changed the umask setting /etc/profile from umask 022 to umask 002. Is this a safe and proper way to handle this?

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  • installing a linux iso from within a university network

    - by pepperdreamteam
    In order to install gentoo, I need to connect to a university wireless internet network. It requires a username and password login/authentication. I'm wondering if anyone has any advice in terms of how to configure the internet connection. The Gentoo installation documentation recommends the use of net-setup, pppoe, pptp, dhcp and iwconfig. I can't figure out how to configure this connection, as the only way I understand is to select the network from a list and enter in authentication data from within a browser.

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  • Write permissions on uploaded files - PHP & Linux

    - by letseatfood
    I am working on a PHP script that transfers files using FTP functions. It has always worked on my production server (which is a hosting service). The development server I have just setup (I am a novice to servers) is Debian Lenny with Apache2, PHP5, and MySQL5. The file transfer works correctly, but once the file has been written to the server, it has permissions of 600. This makes it impossible for me to view the file (JPEG) in the web browser, as permission is denied. I have scoured the internet and even broken my server installation and reinstalled it trying to figure this out (which has been fun, nonetheless!). I know it is unwise to set 777 permissions on public accessible files, but even that will not solve the problem. The only thing that works is if I chmod 777 thefile.jpg after it has been transferred, which is not a working solution. I tried changing the owner of my site files to www-data per this post, but that also does not work. My user is mike, and it still does not work whether the owner of the files is mike or root. Would somebody point me in the right direction? Thanks! And, of course, let me know if I can clarify anything.

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  • ubuntu dmidecode is not functioning properly

    - by Alaa Alomari
    dmidecode is giving irrelevant and conflicted results. it shows that i have two slots while the correct is 8 (the board is Tyan S5350.) uname -a Linux synd01 3.0.0-16-server #29-Ubuntu SMP Tue Feb 14 13:08:12 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux root@synd01:/home/badmin# dmidecode -t 16 dmidecode 2.9 SMBIOS 2.33 present. Handle 0x0011, DMI type 16, 15 bytes Physical Memory Array Location: System Board Or Motherboard Use: System Memory Error Correction Type: None Maximum Capacity: 4 GB Error Information Handle: Not Provided Number Of Devices: 2 while root@synd01:/home/badmin# dmidecode -t 17 | grep Size Size: No Module Installed Size: No Module Installed Size: 1024 MB Size: 1024 MB Size: No Module Installed Size: No Module Installed Size: 1024 MB Size: 1024 MB also lshw shows: *-memory description: System Memory physical id: 11 slot: System board or motherboard size: 4GiB *-bank:0 description: DIMM DDR Synchronous 166 MHz (6.0 ns) [empty] physical id: 0 slot: J3B1 clock: 166MHz (6.0ns) *-bank:1 description: DIMM DDR Synchronous 166 MHz (6.0 ns) [empty] physical id: 1 slot: J3B3 clock: 166MHz (6.0ns) *-bank:2 description: DIMM DDR Synchronous 166 MHz (6.0 ns) physical id: 2 slot: J2B2 size: 1GiB width: 64 bits clock: 166MHz (6.0ns) *-bank:3 description: DIMM DDR Synchronous 166 MHz (6.0 ns) physical id: 3 slot: J2B4 size: 1GiB width: 64 bits clock: 166MHz (6.0ns) *-bank:4 description: DIMM DDR Synchronous 166 MHz (6.0 ns) [empty] physical id: 4 slot: J3B2 clock: 166MHz (6.0ns) *-bank:5 description: DIMM DDR Synchronous 166 MHz (6.0 ns) [empty] physical id: 5 slot: J2B1 clock: 166MHz (6.0ns) *-bank:6 description: DIMM DDR Synchronous 166 MHz (6.0 ns) physical id: 6 slot: J2B3 size: 1GiB width: 64 bits clock: 166MHz (6.0ns) *-bank:7 description: DIMM DDR Synchronous 166 MHz (6.0 ns) physical id: 7 slot: J1B1 size: 1GiB width: 64 bits clock: 166MHz (6.0ns) what might cause this conflict and how can i fix it? Thanks

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  • Linux: prevent outgoing TCP flood

    - by Willem
    I run several hundred webservers behind loadbalancers, hosting many different sites with a plethora of applications (of which I have no control). About once every month, one of the sites gets hacked and a flood script is uploaded to attack some bank or political institution. In the past, these were always UDP floods which were effectively resolved by blocking outgoing UDP traffic on the individual webserver. Yesterday they started flooding a large US bank from our servers using many TCP connections to port 80. As these type of connections are perfectly valid for our applications, just blocking them is not an acceptable solution. I am considering the following alternatives. Which one would you recommend? Have you implemented these, and how? Limit on the webserver (iptables) outgoing TCP packets with source port != 80 Same but with queueing (tc) Rate limit outgoing traffic per user per server. Quite an administrative burden, as there are potentially 1000's of different users per application server. Maybe this: how can I limit per user bandwidth? Anything else? Naturally, I'm also looking into ways to minimize the chance of hackers getting into one of our hosted sites, but as that mechanism will never be 100% waterproof, I want to severely limit the impact of an intrusion. Cheers!

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  • Linux: can't downgrade ATI graphic driver

    - by java.is.for.desktop
    I had the old 10.9 driver of ATI, it worked fine. Sadly, I decided to upgrade it to the new 10.12. After that, HDMI stopped working. So, I want to downgrade back to 10.9. I did everything by the book. But it fails: As root, I do: cd /usr/share/ati sh ./fglrx-uninstall.sh Yes, the uninstall process tells me that everything is fine uninstalled. And after doing reboot, I have the default opensource ATI driver which comes with X11 (or the kernel?). The ATI control panel shortcut points to nowhere. So, the driver seems uninstalled. Now I install the older (10.9) proprietary ATI driver. It also finishes successfully. But after reboot, the ATI control panel tells me that I still have 10.12. And it seems to be true, because HDMI doesn't work. So, how can I completely purge the new non-working driver and downgrade to the old one?

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  • linux "date -s" command not working to change date on a server

    - by nelaar
    date +%T --set="12:19:06" 12:19:06 date Mon Nov 26 12:37:32 SAST 2012 I have tried many different forms of this command but nothing seams to work. In changing the date on this computer server running as VM is not working. Our messages log show messages like thise ntpd[3496]: time correction of -1098 seconds exceeds sanity limit (1000); set clock manually to the correct UTC time. Our server is now about 20 minutes out. It seams like our server has not been updating the time correctly for a few days. Nov 22 19:29:23 hostname ntpd[1818]: time reset -998.577519 s Nov 22 19:32:34 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 19:33:39 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 19:52:30 hostname ntpd[1818]: time reset -998.992426 s Nov 22 19:55:47 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 19:56:53 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:13:04 hostname ntpd[1818]: time reset -999.374412 s Nov 22 20:16:40 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 20:17:44 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:32:02 hostname ntpd[1818]: time reset -999.716832 s Nov 22 20:35:28 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 20:36:16 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:56:39 hostname ntpd[1818]: time correction of -1000 seconds exceeds sanity limit (1000); set clock manually to the correct UTC time.

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  • Which linux-based firewall?

    - by Atlas
    We are looking to replace our current aging firewall/router with a new one. We would prefer it to be free/opensource if possible. Our minimum requirements would be: 1) Site-to-site VPN 2) Web URL/IP filtering 3) 2 WAN connections with load-balancing 4) Easy-to-use web inferface Any suggestions? and why you chose yours.

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  • Linux: don't use file system cache under a directory

    - by GetFree
    For a PHP website I'm monitoring, I need to see what files are being used each time the browser makes a request. I thought of using find . -type f -amin 1. With that I get all files which were read in the last minute (it's a developing server so only I am using the website). I took care of removing the noatime attribute from the mounting point. However there must be something else that's preventing the kernel from reading the actual files on disk because the access time is not being updated when I read a file. I guess it must be the file-system cache which is retrieving the files from memory. Is there a way to disable file caching under a specific directory? (public_html in my case) Also I read somewhere that there is the nobh mounting atributes which apparently disables file caching under that mounting point, but I'm not sure.

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  • Creating zoom-pan video from a picture in Linux

    - by Pavel
    I would like to make a six second video using six images. Each second is sliding over one image from its top to its botom. Or some other motion effect – I would like to try several. I tried kdenlive Imagination Videoporama PhotoFilmStrip The first one has not enough settings (don't remember what exactly) and all those have rather poor quality – the resized picture is very "aliased" (like no quadratic filter was applied during resizing).

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  • Ubuntu 12.04 open port 80 inside WLAN

    - by Eduard
    I have an nginx server running on ubuntu 12.04 that serves http through port 80 and https through port 443. Everything works fine if I access it from the same computer via localhost, 127.0.0.1 or the local IP 192.168.0.11. If I try to access the server from another computer in the same VLAN it does not work for http; it works for https. I have changed my nginx configuration to also listen to port 8000 for http; I can then access http from the other computer in the same VLAN via "http://192.168.0.11:8000". I also have a web server running on port 80 on a windows machine and can access it from another device in the same VLAN, therefore the router is not blocking incoming http traffic. The nginx process is run by root. I have used tcpdump and I see that packets are arriving to Ubuntu: 192.168.0.16.49735 192.168.0.11.80 and that some response is being given 192.168.0.11.80 192.168.0.16.49735 (I do not know what the response is though). There is no request arriving at the nginx web server (I have checked the access log). I have iptables empty. I have unsuccessfully tried to find a solution for a long time to this, it has now become a matter of happiness or bitterness :).

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  • Linux file permissions seem right but I can't write to a directory

    - by CaseyB
    I believe that I have the permissions set correctly but I can't write to a directory. Here's my problem: cborders@Kraken:/var/www$ ls -la total 12 drwxrwxr-x 2 webz webz 4096 2011-12-30 14:58 ./ drwxr-xr-x 13 root root 4096 2011-12-30 14:58 ../ -rw-rw-r-- 1 webz webz 177 2011-12-30 14:58 index.html cborders@Kraken:/var/www$ id cborders uid=1000(cborders) gid=1000(cborders) groups=1000(cborders),4(adm),20(dialout),24(cdrom),46(plugdev),109(sambashare),113(lpadmin),114(admin),1002(webz) cborders@Kraken:/var/www$ mkdir test mkdir: cannot create directory `test': Permission denied The owner of the directory is a user called webz and the permissions allow the user and group rwx access to it. I am in the webz group but I still can't make any changes. What am I doing wrong here?

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  • Weird console problem in linux, usually right before OOM

    - by Kevin Quinn
    So I've noticed this happen more than once. If I remember correctly, this usually happens right before OOM, and/or kernel panic that if you type into a tty and then try to backspace it, the same characters are printed back in reverse. This has been merely an interesting oddity to me in the past, but it happened again recently, and I've gotten more curious about what's actually causing that. (Is it sending the characters back to STD_OUT or something?) Does anyone have any idea? I have a feeling the answer will be interesting. Just so I'm clear, if you typed hello world, then tried to backspace it: hello world..dlrow olleh

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  • How can I free memory on linux

    - by user35153
    When I use top to see memory usage, I have 65gb ram but only 1.3gb of it free and remaining is shown as used. When I ran my program It gives memory insufficiency error. Although no other program is using the remaining 63.7gb ram it is hold. how can I get free the unused ram?

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  • Configuring my Linux firewall for Tomcat

    - by David Pinn
    I'm following some instructions for Installing Tomcat. They require me to add the following line to my iptables file: -A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 8080 --syn -j ACCEPT Having carefully read the man page for iptables, I have learned what the parameters do, except for the first one. What does -A RH-Lokkit-0-50-INPUT do, and can you confirm that it is sensible in this case?

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  • ssd firmware, linux: updating large batch of drives

    - by wryfi
    I was recently hit with a fatal firmware bug that affected dozens of Crucial SSDs deployed in my datacenter. Many of the affected machines use LSI or other proprietary SAS controllers, which Crucial's bootable ISO does not recognize. None of the affected machines has a Windows license. The story is roughly similar for other SSD mfrs, including Samsung and Intel. To resolve this issue, I was forced to stop each machine, remove the affected SSD, remove the SSD from its hotswap caddy, install it temporarily into my ThinkPad, flash the firmware, reverse, rinse, repeat. It took the better part of a day to get through all the affected devices. I am looking for hardware, software, and/or purchasing strategies to ease this pain, as SSD firmware bugs seem inevitable, and our SSD footprint is growing. My first thought is to get a laptop with eSATA and one of these cables (http://www.newegg.com/Product/Product.aspx?Item=N82E16812311004). That should at least make it so I don't have to remove the drives from their caddies. Surely others have run into this. Any novel solutions?

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  • Linux USB/Serial port won't create a tty device in /dev

    - by Dave
    I am connecting a USB to serial driver port to my system and I get about halfway to where I need to go. When it is plugged in dmesg indicates: <6>usb 2-1: new full speed USB device using sl811-hcd and address 4 <6>usb 2-1: configuration #1 chosen from 1 choice and lsusb Bus 2 Device 4: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 2 Device 1: ID 0000:0000 Bus 1 Device 1: ID 0000:0000 I get a series of usbdev2.4 (usbdev2.4, usbdev2.4_ep00, etc) devices in dev but no ttyUSB0 or anything that I can open with minicom. How do I get the system to create the /dev device? Thanks Dave

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  • sound volume increase beyond 100% whenever possible on linux

    - by fakedrake
    Some audio output from files or streams is too low. It is obvious that hardware is able to play the same sounds but louder but because of the data it just plays it at some low level even at 100% volume. Vlc can generally increase the volume of a file up to 200%. Is there a way to do the same thing VLC does system-wide and if possible for an arbitrary v percentage value. If there is no application that does this, where should i look into for libs to do it myself or what code should i modify(eg code in the alsamixer) thank you Note: Asked the same thing on stackoverflow and they directed me here.

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  • linux/shell: change a file's modify timestamp relatively?

    - by index
    My Canon camera produces files like IMG_1234.JPG and MVI_1234.AVI. It also timestamps those files. Unfortunately during a trip to another timezone several cameras were used, one of which did not have the correct time zone set - meta data mess.. Now I would like to correct this. Proposed algorithm: 1 read file's modify date 2 add delta, i.e. hhmmss (preferred: change timezone) 3 write new timestamp Unless someone knows a tool or a combination of tools that do the trick directly, maybe one could simplify the calculation using epoch time (seconds since ..) and whip up a shell script. Any help appreciated!

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  • Linux user authentication with Microsoft LDAP

    - by TusharG
    I'm trying to do following things: Login to CentOS over ssh: authentication needs to happen with Microsoft Ldap On successful login create a home directory for user in /home if directory exists take him to his home directory Put quota on /home/user directory of 5 GB Can someone please show me a link for Centos/redhat to authorize users with Microsoft Ldap? I have already tried: setup command from root - "Authentication configuration" - "[] User Information - Use Ldap" - Authentication - [] Use Ldap Authentication" - []/[*] Use TLS - Server: ldap://corporate.company.com - Base DN: dc=corporate,dc=company,dc=com" This does not authentication users with Microsoft LDAP

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  • Linux QoS: bulk data transmission during idle times

    - by syneticon-dj
    How would I do a QoS setup where a certain low-priority data stream would get up to X Mbps of bandwidth, but only if the current total bandwidth (of all streams/classes) on this interface does not exceed X? At the same time, other data streams / classes must not be limited to X. The use case is an ISP billing the traffic by calculating the bandwidth average over 5 minute intervals and billing the maximum. I would like to keep the maximum usage to a minimum (i.e. quench the bulk transfer during interface busy times) but get the data through during idle/low traffic times. Looking at the frequently used classful schedulers CBQ, HTB and HSFC I cannot see a straightforward way to accomplish this.

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  • More than 10k connections on linux vps

    - by Sash_007
    my question what is causing this and how to check? we use url masking script is the website..is it causing this?please help We could noticed that you are abusing our network, as you have made more than 10k connections in our node due to this our node became unstable and all of our customer faced down time because of your VPS. Please find the log details below for your reference. ============================== 593 src=199.231.227.56 dst=58.2.236.196 465 src=199.231.227.56 dst=192.223.243.6 396 src=199.231.227.56 dst=58.2.238.191 217 src=199.231.227.56 dst=58.2.236.197 161 src=199.231.227.56 dst=20.139.83.50 145 src=199.231.227.56 dst=192.223.163.6 136 src=199.231.227.56 dst=125.21.230.68 134 src=199.231.227.56 dst=125.21.230.132 131 src=199.231.227.56 dst=20.139.67.50 117 src=199.231.227.56 dst=110.234.29.210 112 src=199.231.227.56 dst=65.52.0.51 104 src=199.231.227.56 dst=202.46.23.55 100 src=199.231.227.56 dst=202.3.120.4 94 src=199.231.227.56 dst=117.198.39.22 69 src=203.197.253.62 dst=199.231.227.56 62 src=14.194.248.225 dst=199.231.227.56 53 src=199.231.227.56 dst=192.223.136.5 52 src=49.248.11.195 dst=199.231.227.56 51 src=199.231.227.56 dst=117.198.38.15 50 src=199.231.227.56 dst=192.71.175.2 47 src=199.231.227.56 dst=61.16.189.76 45 src=199.231.227.56 dst=122.177.222.17 43 src=199.231.227.56 dst=115.242.89.40 42 src=199.231.227.56 dst=103.22.237.215 41 src=125.16.9.2 dst=199.231.227.56 39 src=199.231.227.56 dst=117.198.35.90 38 src=199.231.227.56 dst=203.91.201.54 38 src=199.231.227.56 dst=14.139.241.89 38 src=199.231.227.56 dst=111.93.85.82 37 src=199.231.227.56 dst=65.52.0.56 Note: 1st column indicates the total number of connections to a particular IP. You have totally made more than 10k connections.

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  • Using terminal vs KDE in linux?

    - by Ke
    Im used to using nautilus within centos but have recently just got a VPS and quickly realising that using a KDE is unacceptable in this environment. Although I do find it so much quicker doing things like folder permissions in KDE rather than typing it all out in the terminal? Everyone I speak to says, use the terminal and I should learn this way as opposed to using the KDE, but theres certain things I just dont get How is it possible to make quick changes to scripts and viewing them in a browser etc , without a mouse or using KDE? and only using a terminal?? I am wondering how to develop websites just using the terminal??? How can it be quicker to type out/view permissions etc in the terminal when its instant and just a few clicks in the KDE? Any thoughts are much appreciated. I would love to understand the benefits but just cant seem to see them right now. Cheers Ke.

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