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

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Recovery from bad CD with linux

I have a CD which isn't properly finished. I have to recover the data from it. Machines react kind of differently for it but none of them can access it. I can't even DD the data off... dd if=/dev/sr0 ...
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2answers
29 views

Copy over existing files without confirmation?

I need to copy and over-write a large amount of files, I've used the following command: # cp -Rf * ../ But then whenever a file with the same name exists on the destination folder I get this ...
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0answers
22 views

Is linux mail command a MUA (Mail User Agent)? [on hold]

Is linux mail (or mailx) command a default MUA (Mail User Agent) ? Is it a light-weight MUA, without advanced functionalities that general MUAs usually provide, like search?
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1answer
17 views

Apache Tomcat standalone or with nginx or apache?

I will be rolling out a fairly big project that will be running on Tomcat. I will have a linux VPS for it (Debian). i wanted to know if it is recommended to run it by itself or behind a httpserver ...
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0answers
14 views

Systemd exits from bash scripts that execute commands that result in failure, instead of continuing

I'm trying to get a script that pushes up my system log on CoreOS to logentries. To compensate for the fact that instances don't have internet connectivity right away when being spun up on AWS I've ...
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0answers
2 views

process group A default route tun0, B default route tun1, etc

I have a Linux box with N tunnel interfaces, tun0, tun1, and so on. I want to set things up so that a particular group of processes, A, has its default (and only) route pointed at tun0. Meanwhile, a ...
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0answers
16 views

CSF game servers (team fortress 2) only 20 connections allowed [on hold]

I've question about CSF firewall. I've been running from my high-end dedicated server many websites and csf have been answer to my prayers. But when I try to run team fortress 2 servers only 20 ...
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0answers
4 views

Installing a self-signed cert in an EC2 instance

I have a dedicated EC2 instance running Fedora. The code I have in the EC2 server can be accessed by pointing the browser to: http://ec2-xx-xx-xx-xxx.compute-1.amazonaws.com, I want to be able to ...
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0answers
14 views

send udp packets to a destination via forwarding

i have linux machine A ( 128.247.19.194, netmask 255.255.254.0) linux machine B ( 128.247.19.165 netmask 255.255.254.0) And another linux machine (128.247.19.3 netmask 255.255.254.0) There is a ...
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0answers
10 views

Install Apache Derby on CentOS 6.4

I'm not a Java developer, my knowledge is very limited to this topic. I want to deploy a .war webservice on my Tomcat server, which fails most likely because of its Derby dependency (just a guess from ...
3
votes
1answer
34 views

BackupPC Taking over 72 hours to backup 250GB's

I am using BackupPC to backup some workstations at the office. One workstations in particular has a sizable amount of data when compared to the rest, however, it's not that large in general (talking ...
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0answers
35 views

Multipe vnc sessions on Linux [on hold]

To start a vncsession on a specific port in Linux, we use the following command vncserver :6 vncserver :7 vncserver :8 Wanted to check if it was possible to start vnc on all the 3 ports 6-8 in a ...
3
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2answers
33 views

On a freshly-rebooted server why would the CPU running time of processes be huge?

I rebooted our server this morning, yet there are umpteen processes that appear to have been running for 600+ days? Could someone please shed some light? The datetime of the machine is correct: ...
1
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0answers
14 views

OpenVZ - updating kernel and all containers

Last night I upgraded to the latest kernel of openvz. I rebooted the host node. It came up with the latest kernel. However, the containers are still running the old kernel. What I did on the host ...
0
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1answer
30 views

How to run a script within an Amazon EC2 when the instance starts for the first time?

I have made my own AMI's for internal purpose. How do I run a script when the instance is launched using this AMI? How can I do this? My current approach is by adding the script, say myscript.sh, to ...
1
vote
1answer
22 views

How to set up the routing mail server with public static IP interface and private IP interface

I a building an email server that will use Postfix for SMTP, and Dovecot for IMAP. This server will have two interfaces: wwan0 - this interface has a static public IP address, and will be used by ...
2
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2answers
66 views

Allowing nagios plugin check_dhcp to work without setuid root

Nagios has a plugin, check_dhcp, that does exactly what you'd think. It's widely suggested to install it setuid root, because it uses SO_BINDTODEVICE, which usually only root can do. Of course a ...
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2answers
52 views

PHP eats up all the memory

Since this morning one of our webserver's memory getting filled up by php which eventually going to cause the server to start swapping, slow down and become unavailable (an ssh login takes like 5 ...
2
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1answer
17 views

How to make Monit “check process” conditional?

I have a monit script that does something like this: check process sidekiq_1 with pidfile /tmp/pids/sidekiq_1.pid start program = "/bin/bash -l -c 'bundle exec sidekiq start" as uid jim and gid jim ...
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0answers
30 views

Connect two servers with RJ-45 cable and iptables (without switch!)

I have two servers and server_1 is connected to INTERNET port (of server farm) at eth0. No switch. They connected with cable from (server_1)eth1 -> (server_2)eth0 : ifconfig of (server_1): eth0 ...
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3answers
24 views

How to install interdependent repository?

I am installing libjpeg-turbo. To install this library I need to install libjpeg-turbo-devel and vice versa. How to solve interdependency issue? Command: yum install ...
1
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1answer
27 views

Apache high CPU usage but medium overall CPU usage

I am running a website on an Apache server. The server itself is an 8 core server with 35G RAM. I am monitoring the statistics of the apache resource usage and the overall server resource usage. I ...
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0answers
20 views

Setting up ProxyPass on Apache

I have an OpenSUSE13.1 system that is as follows: Apache Proxy Server, DocumentRoot = /srv/www/v00, Port = 80 Apache Child Server, DocumentRoot = /srv/www/v01, Port = 81 Apache Child Server, ...
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0answers
4 views

DJBDNS svstat /service/tinydns not starting in centos 6.5

I'm using djbdns for the past 6 years...Right now facing some issue while configuring our new server.Centos 6.5 Now I have a new server from digital ocean (Droplet) Installation of deamons , ...
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0answers
25 views

Are DNS server responses categorized as “ESTABLISHED” by iptables? If so, why? [duplicate]

CentOS 5.x I'm trying to confirm which specific rule in my iptables config is allowing return UDP traffic from my DNS server. I THINK, it's this one: -A RH-Firewall-1-INPUT -m state --state ...
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0answers
49 views

Server A can see B, but B can't see A

I am setting up a network with a CentOS client, a CentOS server and a BIG-IP. The network looks like this: (client) < -- > (BIG-IP) < -- > (server) The client is on a 10.10.20.x ...
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1answer
18 views

TLS Error on OpenVPN

Client: OpenVPN 2.3.4 64bit (Works fine connecting to my pfSense at home) Server: OpenVPN 2.2.2 installed via yum Followed this guide: ...
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0answers
23 views

Shared hosting server setup [on hold]

Right now I'm creating shared hosting infrastructure (one server as host, multiple LXC guests with inbound traffic to them via nginx, NAT their outbound traffic back to the Internet). So, could ...
0
votes
1answer
32 views

How to set DNS exclusively for a Network Namespace in Linux

I've created a network namespace in Linux. I thought there was a resolv.conf file for each namespaces created but it's not the case on my system. I don't have the following path ...
0
votes
1answer
19 views

FTP uploads have incorrect permissions when using vsftpd

I recently set up an FTP site using VSFTPD on Debian, and am running into an issue with uploaded directories not being able to be accessed. Files are okay but when I try to upload a directory or ...
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2answers
35 views

Restart tomcat on two different servers at same time

We are running the Apache solr on two servers. Unfortunately on heavy load of indexing (guess) servers going down. We are manually restarting the tomcat each time. When I google I find the way two ...
2
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1answer
39 views

Linux bridging for KVM

I have a Debian Wheezy machine on which I tried to setup KVM with bridged networking. Unfortunately, the bridge does not appear to forward traffic correctly. My setup is the following: The physical ...
2
votes
1answer
43 views

“No buffer space available” on connect

I'm seeing the error message "No buffer space available" when processes call "connect" on a Linux virtual machine. I'm having trouble tracking down the cause - hopefully someone can help! I've ...
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2answers
28 views

how to enable scp only on public interface and ssh only in internal interface

Server A has a public ip and a private ip, each on another vlan and thus on another virtual interface. How can I enable scp only on the public ip and ssh only on the private IP, for all users. Kind ...
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2answers
34 views

Run multiple instances of apache with PHP5

I am attempting to setup a Dell Poweredge R720 server with OpenSUSE 13.1. I need to run multiple instances of apache (Either 1 install multiple instances or multiple installs with multiple ...
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1answer
19 views

OpenVPN client breaks remote access to web server

I have an issue where whenever I use OpenVPN client to connect to the remote server to (obviously) set up a VPN tunnel, I can no longer see my nginx server. I can connect on the local network but it ...
0
votes
1answer
39 views

SSH connection timing out on certain clients only

I have a server that has around 100 SSH tunnel connections active from client servers across Canada and the US. We use the same device that runs a custom build of Ubuntu and load that on each client ...
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5answers
39 views

how to find mysql binary in redhat

I am working with a Redhat distribution. The network admin is inaccessible so I have no ability to request information. Using bash, how do I find the mysql binary so that I can run sql commands? ...
1
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2answers
52 views

What is Linux containers after all? [duplicate]

I've been reading many documentations on Linux containers. I also tried it out the CentOS way and the Ubuntu way . Wikipedia says it is an operating system–level virtualization. ...
3
votes
4answers
210 views

How do I Control the Ordering of Network Interfaces?

I'm attempting to configure a machine with 3 NICs, the first two are built-in GbE controllers, the third is a 10GbE controller. Via NetworkManager, I've configured the 'first' GbE NIC (which at the ...
1
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0answers
36 views

Linux mint 15, synaptic can't download all repository indexes [migrated]

I'm using Linux Mint 15, and started getting these errors from synaptic update manager. I did not change anything in the system, one day it just started to throw these errors. My network works OK, all ...
11
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2answers
531 views

Is there a way to create a “one-time” boot entry in grub?

I have the following issue: I have a small server (Debian based) to which I can connect remotely (VPN/SSH connection). Now I want to change some boot options (in fact I want to migrate my root file ...
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0answers
10 views

Net-SNMP SNMPv3 - Forwarding to a manager

We are currently in the process of moving from SNMPv2 to SNMPv3 in our enclave including both Linux and Windows machines. We are utilizing Net-SNMP which has been, up to this point, difficult to ...
2
votes
1answer
119 views

sudo still ask for password when NOPASSWD is used

I read all sudo posts on serverfault, but I still cannot figure out what I'm doing wrong. Normally I finally find the solution but not this time : I want apache user to be able to execute this ...
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0answers
29 views

Bacula backup with secondary storage on poor conection

We use hetzner dedicated servers for virtualization (xen). Each instance got a 100GB free sftp backup storage, buing more is not an option - it's too expensive. Currently we use bacula and mount this ...
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0answers
18 views

can't connect E1 digium te420 to freeswitch on CentOS

i'm experiencing an unknown problem for me, while i'm trying to connect digium te420 to freeswitch running on CentOS, digium card gives an alarm light while i'm connecting it. any ideas, can IRQ ...
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2answers
35 views

How to monitor RAID1 system with Dell PERC H200 controller?

I have a server configured with RAID1 using a Dell PERC H200 controller. I tried to use smartmontools to monitor the disks. But after installing it and running the command, it says SMART support is ...
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0answers
31 views

Debian Wheezy in KVM: can't set IO scheduler

I'm running a Wheezy box in KVM, by default it runs the kernel 3.2. After I upgrade to 3.14 from backports, I no longer can tune the IO scheduler. Before: # cat /sys/block/vda/queue/scheduler noop ...
38
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3answers
7k views

Isn't Ctrl-Alt-Delete on Linux *really* dangerous?

Is the default Ctrl-Alt-Delete shutdown -r functionality on Linux systems a dangerous feature? Years ago, when I deployed physical systems with attached keyboards and monitors, I'd sometimes modify ...
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8answers
99 views

list linux partition names only in bash

df on linux lists the following stats on partitions. -bash-4.1# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda3 1918217320 1473337340 347440136 81% / ...