Linux is the generic term for a UNIX-like open source operating system based on the Linux kernel.

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1answer
94 views

Can't mount disk (VFS: Can't find ext4 filesystem)

Tried to mount a disk (hardware raid) but failed. #mount -t ext4 /dev/sda /data mount: wrong fs type, bad option, bad superblock on /dev/sda, missing codepage or helper program, or other ...
1
vote
1answer
27 views

vSwap vs Burstable RAM for OpenVZ

What is the big difference between vSwap and Burstable RAM? Does vSwap create and cause I/O by using disk? I know SWAP will use the disk so is vSwap the same as swap just virtualized in the ...
-1
votes
0answers
35 views

Linux server apache httpd processes take i/o wait to close to 100% and lock down server

For about 5 days now, and seemingly out of the blue, my linux server has started locking up from time to time. The pattern is always the same as far as I can tell from top and iotop commands around ...
2
votes
3answers
159 views

How can I deploy template-based VM from Linux?

We are trying to provide our Linux engineers with a CLI to deploy VMWare vSphere VMs using templates. The vSphere CLI looks promising but the documentation doesn't mention templates. Does anyone ...
-1
votes
0answers
31 views

RAID bus controller: Intel Corporation 82801 SATA Controller

I have a build server with a soft raid controller and two 250GB drives running Ubuntu 12.04: # lspci ... 00:1f.2 RAID bus controller: Intel Corporation 82801 SATA Controller [RAID mode] ...
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0answers
34 views

Jenkins SSH slave fails to create /home/<user>/jenkins

When configuring an ssh slave on Jenkins, which runs on an ec2 instance, I get the following error message when I click on the "Launch Slave Agent". [08/06/14 18:41:46] [SSH] Opening SSH connection ...
0
votes
1answer
25 views

Problems with a PHP include from the command line (or cronjob) [closed]

I am trying to setup a cronjob on my AWS EC2 instance. There is nothing wrong with the actual entry in the crontab file but when I try to run the command in the command line I get this response. PHP ...
1
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2answers
51 views

Xen PV, Xen HVM and KVM

Am I correct that you can boot up any operating system with either of these virtualization types as they act as a bare metal machine and compile your own kernel? I am looking to switch over from ...
0
votes
1answer
35 views

How to load new profile in Network manager v0.9 without nm-connection-editor using cli?

i'm working on migration of autoprovisioned Ubuntu 12.04 LTS servers from ifup (/etc/network/interfaces) to NetworkManager. /etc/network/interfaces is clean (only loopback interface is configured): # ...
0
votes
1answer
75 views

GRUB does not load OS, displays grub> prompt

I have booted my server, getting some GRUB error and I pasted the error below. Error Code:- GNU GRUB version 0.97(502k Lower/496556K upper memory) [Minimal BASH-like line editing is supported. For ...
1
vote
2answers
27 views

Iptables does not seem to be applying SNAT to packets sent on a raw socket

I'm sending packets from a user space program to my wireless interface wlan0. I've set up a SNAT rule with iptables as follows iptables -t nat -A POSTROUTING -o wlan0 -j SNAT --to 192.168.1.3 And ...
0
votes
1answer
40 views

How to rescue deleted partition table on drive?

I accidentally dd the first 512 bytes using dd if=/dev/zero of=/dev/sdb bs=512 count=1 and the partition table is now gone. Is there ANY way to re-create the partition table. My hard drive is ...
3
votes
3answers
151 views

Service is not starting on Centos on boot

I have a service installed to start jasper reporting server on boot. I believe it is correctly setup. here is the startup script placed in /etc/init.d/jasperserver #!/bin/sh ### BEGIN INIT INFO # ...
2
votes
1answer
100 views

Unable to mount '/dev/sda'

My server has two 2 TB hard disk drives in soft RAID 1. I can't mount /dev/sda. Output of parted -l root@rescue:~# parted -l Model: ATA HGST HUS724020AL (scsi) Disk /dev/sda: 2000GB Sector size ...
4
votes
1answer
135 views

Setting up IPTables

I am trying to remove a router from our product and replacing all its functionality with the use of iptables. The system is required to perform general traffic control as well as forwarding data to ...
-1
votes
0answers
13 views

service postfix status = -b (pid 11289) is running

Before integrating mailscanner and clam antivirus the output of service postfix status was => master (pid 12151) is running... after integration the output of service postfix status is => -b (pid ...
1
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2answers
88 views

Simple, decentralized, automatically synced, local cached file share for linux server

I wonder if someone could recommend me some solution to sharing files between a small amount of linux VPS (virtual private servers). Basically I have a bunch of linux VPS to manage, and I want to ...
0
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0answers
24 views

Signed NTP authentication

Using ansible, I have setup several Signed NTP servers around our network. The servers themselves are Virtual Hosts running on CentOS 6.5. I have the virtual machine guests on each host contact their ...
2
votes
2answers
133 views

How to free linux memory safely to improve server performance

We have a linux virtual server hosted through GoDaddy, and our site has been running slow recently. I poked around the server a bit (I am not a sysadmin and have very limited experience with linux, ...
0
votes
2answers
51 views

Apache web server intermittent stalls

Our SOAP web server is running in PHP on Apache on CentOS and makes heavy use of MySQL. There is heavy demand on the server - most requests are very small and involve only two or three MySQL queries, ...
0
votes
0answers
39 views

Block outgoing connections on RHEL7/CentOS7 with firewalld?

RHEL7/CentOS7 features a new firewalld firewall service, that replaces the iptables service (both of which use iptables tool to interact with kernel's Netfilter underneath). firewalld can be easily ...
0
votes
4answers
50 views

Proper way of interpreting system load on a 4 core 8 thread processor

As we all know, load of 1.00 on a single processor means that there is a load of 100%. Analogically a 4.00 load on a quad core would be 100%. How should I interpret load on a 4 core 8 thread ...
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1answer
19 views

Secure Copy of Directories and / or Files To a Linux Server [closed]

When copying files or directories to a Linux server, what is the difference between 'scp -r' and 'scp -R'?
1
vote
1answer
29 views

Need linux milter solution to log email body into database

We exchange emails with various clients and vendors. I am trying to implement a solution where all the email communications between our rep and the client or vendor is saved in our database so in our ...
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0answers
18 views

Can I allocate free space and create new partition from mounted logical volume? [duplicate]

This is the current state of my logical volumes: # pvs -o+pv_used PV VG Fmt Attr PSize PFree Used /dev/sda2 vg_ecomwise lvm2 a-- 465.27g 0 465.27g # lvs -o+lv_size LV ...
0
votes
1answer
46 views

MySQL Master-Master Replication Issue

I have two databases that sync data through Master-Master replication. The setup was created using the following guide: ...
10
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3answers
431 views

There is nohup, is there a nousr1 command?

Several of my regular programs crash (on a regular basis) with the message "User defined signal 1". I know there is a nohup command, but is there a nousr1 command? Or something which will do ...
0
votes
2answers
35 views

Raid 1 can not sync with new Drive . its stopping at 30 %

i had trying to add new HDD in place of Falty HDD. but new HDD can not sync with old one .sync process shown up to 30 % after that its stopped . cat /proc/mdstat Personalities : [raid1] md2 : ...
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votes
1answer
27 views

Users unable to connect due to an unknown plausible reason [closed]

========================= Warning: Long thread; includes a lot of information to give you some basic understanding of my issues. If you rather not read it, then here are my questions: 1) Does Linux ...
-2
votes
1answer
39 views

How do I recieve incoming mail on an email address in Linux [closed]

Background: My department does a lot of communication using email to ask and answer questions. We have an internal StackOverflow type board set up but it's a headache for them to log in to the VPN and ...
0
votes
0answers
32 views

Varnish “it works” page on all domains

I installed Varnish on my virtual server(Debian 7.0 x64) Digital Ocean and I followed their tutorial here. The problem is that on all my domains and subdomains, I get the it works message. I tried ...
-1
votes
1answer
67 views

Can Linux cloud servers be used for render farms [closed]

Can Linux cloud instances (e.g. on Digital Ocean or Linode) be used for own, on-demand render farms? Are there any open source solutions for "slave" servers? EDIT My research didn't lead me to ...
0
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0answers
5 views

Can't get out of foreground mode in STunnel [migrated]

I was trying to debug an STunnel installation on my Raspberry Pi (using Raspbian) and so I set the foreground mode to yes (which is something suggested in the official documentation). Unfortunately, ...
0
votes
0answers
24 views

Dell Poweredge R410 does not recognize second CPU

I have a Dell Poweredge R410 with two CPUs installed. I tried everything but the second CPU does not get recognized by the BIOS or the Linux Operating System it has. Both CPUs are Intel Xeon E5602 ...
-1
votes
2answers
39 views

CentOS: Can't add route after deleting the /24 rule from main routing table

As the title says, after deleting a rule from the main routing able I am not able to add any route till I do service network restart or ifup eth0 To reproduce the problem: ip route list table ...
0
votes
0answers
12 views

xmacro without running x server?

I need to record typing in terminal, and it works just great in x session inside of xterm with xmacro, but I need to do such macro recording without running x server, and I can't really find the ...
0
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0answers
30 views

linux bash prevention flocking for background process [migrated]

My script makes flock. This prevents me for runing its twice. Script can execute another script, and there is a problem. Sometimes another scripts leaves processes in background. Unfortunately they ...
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votes
2answers
45 views

Bash Script that downloads a file and checks the value if 1 or 0 [closed]

I need a Bash Script for Debian which downloads a file, that file containts 1 or 0, 1 when the services is running, 0 when not. So how can I check if the file contains 1 or 0?
1
vote
2answers
138 views

Transparent compression filesystem in conjunction with ext4

I am trying to test a project that needs compressed storage with use of the ext4 file system since the application I use relies on ext4 features. Are there any production/stable solutions out there ...
0
votes
1answer
34 views

Linux: Duplicate network interface to simulate link failures

I run Ubuntu. I need to add some latency and/or some network errors to see if my application can handle with network failure ( connecting & disconnecting ). I found "tc" tool which will be helpful ...
0
votes
1answer
43 views

Should I still disable root if I disable password authentication and enable only key authentication?

I'm new to the linux world and I've been reading a few tutorials on security. I've seen some questions on StackExchange tackling this subject, but from what I've seen, none of the answers clarified ...
0
votes
1answer
23 views

proFTPD with FTPS (openssl)

Have installed proFTPD from webmin and it works... Then I would like to support FTPS command line apt-get install openssl mkdir /etc/proftpd/ssl cd /etc/proftpd/ssl openssl req -x509 -nodes -days ...
-5
votes
1answer
45 views

What operating system is used according to enclosed picture? [closed]

Sorry for the beginner question but can one guess what OS this is from the named folder in the structure? I was not allowed to post the picture but perhaps the link works. (have no text-based img). ...
0
votes
1answer
28 views

proFTPD unable to determine IP address

When starting the server this error is returned Starting ftp server: proftpd2014-08-03 18:39:22,045 web-amd-3700-2gb proftpd[22126]: warning: unable to determine IP address of 'web-amd-3700-2gb' ...
0
votes
1answer
27 views

Ubunutu 12.04 Packet loss

I have this Ubuntu Server (12.04.2) which sometimes (thrice a day for 5 minutes) it's unreachable through zabbix and SolarWinds Orion. I logged into to Orion server and Zabbix server and did a ping ...
0
votes
2answers
28 views

How to check the connection to remote server with a digital certificate (client authentication)

I got a digital certificate with extensions for server and client authentication and a private key. Now I want to connect to a remote server (REST web services) which should accept my requests ...
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votes
1answer
37 views

PPTPD not working on virtual machine running Kali Linux

I need to capture non-http traffic from my iPhone. Using a proxy will only capture port :80 and :443 traffic which will not work for me as the traffic I am trying to capture is not from either of ...
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votes
2answers
45 views

Get domains accessed through a specific port [closed]

I'm developing a product and at a certain point I need to get domain names used to access some service on a specific port. Let's suppose I've a computers network with Internet access through a Linux ...
0
votes
0answers
4 views

How to transcode mkv media into different resolutions with ffmpeg [migrated]

I am trying to setup a server that allows me to broadcast a single media file using ffmpeg to a ffserver so that I can use the RTP protocol to allow clients to view the media at different resolutions ...
1
vote
0answers
14 views

smartd rule does not work

I have an issue with smartd. I've studied its man page, and then I've set the SMART daemon to run long test of the hard disks two times a month and alert to the specified mail address in case of ...