Linux refers to the family of Unix-like computer operating systems using the Linux kernel. If your question is about a certain distribution only, use a more specific tag.

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Open MPI: max processes on a single node

I am using openMPI (ver 1.6.2) on a CentOS 6.6 cluster. I am trying to find ways to increase no. of processes on a single node using OpenMPI. Each node on my cluster has 20 cores. I trying with a ...
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how to install .tar.xz file in ubuntu

i am new in linux. i downloaded a vlc .tar.xz file. then searched Internet how to install .tar.xz. But unable to install. The command i written and result got given below.. ...
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PCMCIA card under linux

Is it possible to use STLAB 10/100 PCMCIA LAN card under linux? From linux live CD?
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GNU Screen equivalent for X11 aplications [duplicate]

What is the X11 equivalent of GNU Screen for X11 applications? I know there is VNC, possibly RDP and other candidates, but last week when tuning up my VNC config I've stumbled upon a project, that was ...
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How to properly unmount AUFS filesystem used as root filesystem

I have an embedded system that has an (always) read-only root filesystem with a writeable filesystem overlayed on top of it. However, I'm having problems on system shutdown unmounting or remounting it ...
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Slow SMTP connections to Google memory overload ( Controlling Exim timeouts)

Our organization has several servers that generate and send out lots of emails (we're not spammers, it's legit email to users who have asked for it). Exim on these machines is configured to only try ...
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How to set up an OpenVPN Access Server inside of NetworkManager for GNOME?

I have an OpenVPN server running on a VPS I rent out from Atlanta. It is running CentOS 7 and is using the latest version of the OpenVPN Access Server software. I want to set up my VPN inside of the ...
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Why can't I detach a mirrored device if enough replicas are available?

man zpool states that zpool detach Detaches device from a mirror. The operation is refused if there are no other valid replicas of the data. If device may be re-added to the pool later on then ...
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SSH broken pipe kills foreground process

I have 2 hosts that I can connect them through SSH. In one host, after a while, I get the error Write Failed: broken pipe. In the other host, I don't get this error. I don't understand why in one ...
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What should I use for an encrypted directory on Debian?

Up to this point I have used ecryptfs, but I'm setting up a new system and have recently read some articles and forum posts saying that ecryptfs is not very good and should not be used. I'm wondering ...
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26 views

ping error two nic cards in linux pc

The problem I'm having is two NIC in my RHEL 6 server with different IP-addresses. PC1 eth0 - 10.10.0.1 eth1 - 192.168.1.1 The other computer is setup the same way. PC2 eth0 - 10.10.0.2 ...
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What is the equivalent of Port Forwarding command in Mac Os x Yosemite

ifconfig eth0:0 192.168.1.215 netmask 255.255.255.0 /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE /sbin/iptables -A FORWARD -t filter -i eth0-m state --state ESTABLISHED,RELATED -j ACCEPT ...
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Unable to connect to OpenVPN outside LAN

I've setup OpenVPN behind a router, and port forwarded 1194. The VPN is using the subnet 10.3.15.0/24 and has 192.168.1.14 on the LAN. It works when I'm connecting locally, or from my home network ...
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home folder empty after schroot remove

I was trying to backup and refresh my root server. (Update everything, delete unused files etc.) I uninstalled schroot because i thought i don't use it anyway. Afterwards i started the backup ...
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Wpa_supplicant conf file with PFX files in EAP-TLS mode

While connecting to AP our station having supplicant_conf file in the following format ctrl_interface=/var/run/wpa_supplicant network={ ssid="AP-AES-EAP" key_mgmt=WPA-EAP eap=TLS identity="xxxxx" ...
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1answer
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ssh and scp works but not WinSCP

I have a ubuntu server with 3 user accounts (root, user1, user2). user1 has access via WinSCP, scp and ssh. No problems here. Then I've created another user2 but with this user I can't access the ...
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NFS activity locks desktop during any user initiated file activity

This is a funny little issue that has been happening for a while and I have learnt to work around but would prefer to resolve completely. My desktop PC is running linux mint 17.1 cinnamon. Core I5, ...
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How to triple boot Windows, Mac, and Linux without EFI/UEFI?

I need to have an option to select one of three OSes to boot to from all three installed on a single 1 TB hard drive. The three options are: Windows 8, Hackintosh Snow Leopard, and Ubuntu 14. I need ...
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Converting an ELF executable (Linux) into a PE.exe (Windows)

I am a newbie when it comes to using machine code files!!! I need to use a machine code executable obtained as ELF (Linux) into an exe file for Windows. I have tried 'objconv' but, though the format ...
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33 views

RHEL reboot takes 26 hours [on hold]

I am working as a developer in a website development firm. We have many servers and each one is attached to the load balancer. Yesterday (Apr 19), one of our Linux proxy server's CPU load were ...
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1answer
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Install Sailfish OS on Lenovo Yoga 13

I have two SSDs in my Lenovo Yoga 13 and would like to install Sailfish OS by Jollaon the second SSD next to Windows 8.1. Is there an x86 installer image?
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wpa_supplicant - detecting that my password is incorrect?

If I specify the wrong password for an SSID is there anyway to detect this is the issue when switching to a network? E.g. here I add a network but deliberately specify the wrong password. If I check ...
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29 views

No audio from the standard Jack ports

I've recently had network issues with desktop PC so I had to open it up to do some troubleshooting (then I found out that the WiFi card was dead). Since I put everything back together, I haven't been ...
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1answer
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Is it possible to run Adobe After Effects (CS6 or later versions) under Wine?

I have been unsuccessful trying to install Adobe After Effects on Linux using Wine. If someone has done this successfully, could you share what steps are required beyond a "simple" installation in ...
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105 views

Telnet : How to get [user@hostname userFolder]$

I'm using ubuntu 14.04 LTS and i have successfully configured a telnet server. When i logging into telnet server i always get the path(int the terminal) as username@hostname:~/Folder_Name$ I ...
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1answer
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How can two applications read from the same (digital) sound input in Linux/ALSA?

I have a sound card with an AES/EBU input port that I want to access with two applications simultaneously. I want to record the input to a linear WAV file in real-time while also streaming it through ...
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To increase payload size of libmicrohttpd library

I was assigned a work to create a server daemon for background processing which performs some checks and encryption of data received over http post method. I have to receive the payload of 5MB of ...
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1answer
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PHP server permissisons for files and directories granted, but still not allowed

I have php code on Codeanywhere where I'm simply trying to create a file on the server but yet gets the following error : "Warning: fopen(file.txt): failed to open stream: Permission denied in ...
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1answer
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Sub-domains keeps redirecting me to Main web-site

I have just upgraded my version of LAMP Environment. Rest all the things are working fine but with Sub-domains i have a challenge. I have a Main website abc.biz and 5 to 6 sub-domains with it as ...
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Realtek PCI network card not functioning on Linux

I have two Realtek Ethernet devices on my Linux (CentOS) machine. The onboard interface is detected but the other one is not. In the below lspci output first one is working. [root@compute ~]# lspci | ...
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2answers
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Bridging Firewall to Public Wifi

My building offers wifi to its residents. It is not managed by IT professionals. I would like to use this internet source some of the time, but would like to be protected from machines on that ...
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Centos 7 detecting only 3 GB of RAM

Centos 7 is detecting only less than 3GB of RAM instead of 4 [root@compute ~]# free -m total used free shared buffers cached Mem: 2913 425 ...
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The best technique to copy files faster [on hold]

As usual I need to do backups everyday , rsync is the best option I have at the moment to transfer from a GRAid to a local storage ( minisas from a raid5 storage to raid0 local drive ) . Wondering if ...
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Is there any way to install any linux distro without acesssing the bios? (broken screen)

I am trying to run a Linux system from my y500 Lenovo ideapad but I can not access the boot menu or bios at all. This is because I have a broken screen and am using an external display to make use of ...
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SSL Root CA certificate is not recognized, although present in the trust store. Why?

Background: Ubuntu Server 14.10 64-bit on aws.amazon.com/ec2 Cheap PositiveSSL server certificate from COMODO 1 server certificate, 2 intermediate CA certificates and 1 Root CA certificate as ZIP ...
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Arch Linux insane memory usage

I just installed Arch Linux and set it pretty much up how I want it to be. At the moment XFCE4 with LighDM, Firefox and a few other little applications are running. I wanted to see whats going on in ...
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KDE's file manager Dolphin displays error mesage on Fedora 21

Every time I try to use Dolphin, nothing appears where files should be listed. Instead, there is an error message right below the toolbar that states: Could not start process Cannot talk to ...
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I'm not able to connect with SSH because of SUID warning

When I try to connect with another machine, after this command below: user1@host1:~$ ssh user2@host2 user2@host2's password: I receive: WARNING: Your password has expired. You must change your ...
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Create key combination to run script action

I am having shoulder problems and the mouse movement is hurting my arm, so I am trying to create a simple way of navigating the mouse with vim-like movements. I found xdotool and can, for example, ...
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Debian can't connect to Wi-Fi network after upgrade from Wheezy to Jessie

After upgrading my Thinkpad T420 from Wheezy to Jessie today, the integrated Wi-Fi stopped working. After countless hours of searching, I still can't seem to find what the issue is. In the GNOME ...
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LXC: Automating running an application inside a container

I'm working on a project that automatically compiles, executes and tests the output of submitted programs in C, C++, Java and Python. Obviously this needs to happen inside some sort of secured ...
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How to execute midi commands from a Linux program

In Windows I have the OpenMidi CloseMidi and SendMidi commands. After OpenMidi I get a handle and then I can use SendMidi to send midi messages like 90 52 64, and I will hear a note on the default ...
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Unix permissions error when working with symbolic link and MySQL installation

I'm working to install MySQL on one of our servers. I'm the ec2-user, and I'm attempting to install in the ec2-user home directory, but allowing access to the directory to the mysql user. However, ...
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Wireless dongle driver don't work(Debian)

I have a WiFi dongle that said to support GNU/Linux, however no drivers were found on the CD, after hours of research i found this https://wiki.debian.org/rt2800usb and installed the driver, I'm ...
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lvextend gives insufficient suitable allocatable extents for logical volume set even free extents

I have one LVM with 4 physical disks (created with -i 4 option). I added 2 more disks to VG and trying lvextend which is failing. Below show I have 1TB of space Free in VG. $ sudo vgs VG #PV #LV #SN ...
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Why might a partition show up in `mount` but not `df`?

If I compare this $> sudo mount | grep sdb /dev/sdb1 on /windows type fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096) /dev/sdb2 on /store type ext4 (rw) with this $> ...
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Upgrade KDE Plasma 5.2 to 5.3 in Kubuntu 15.04 Beta 2

I tried looking for a way to upgrade the KDE plasma version of my Kubuntu 15.04 Beta 2 to the latest one, 5.3. But there isn't much reference online about how to do it, expect using Unstable Kubuntu ...
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VPN failover on Tomato Router

I've configured two VPN clients on my router to ensure some of my traffic secure. One of the client is the major one and the other is the alternative one. I'm now using custom routing tables and IP ...
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2answers
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Remove all files in specific folder in Linux

I have a particular group of two folders that are in many places on my CentOS server. Let's say these folders look like this: aaa/bbb/cat aaa/bbb/dog The names and structure of aaa, bbb, cat and ...
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VirtualBox bridged adapter not working with one network

I have been using VirtualBox bridged adapter with some networks and it has worked right. But a few days ago I have tried it with a new network and this time it has not worked. The only difference in ...