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

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

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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39 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
14 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
20 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
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0answers
16 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
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1answer
16 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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1answer
14 views

NFS Share Permissions

I have a NFS share on a Windows Server 2008 host (joined to a domain). I have a non-domain Linux client that mounts to it (using windows credentials) and writes files to it. However, when I try to ...
0
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2answers
28 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
34 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
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1answer
38 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 ...
0
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2answers
26 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 ...
0
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2answers
32 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
17 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
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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 ...
1
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5answers
37 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
47 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
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4answers
209 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 ...
10
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2answers
507 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 ...
0
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0answers
9 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
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1answer
117 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 ...
0
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0answers
28 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 ...
0
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0answers
14 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 ...
0
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2answers
27 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 ...
1
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0answers
30 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 ...
37
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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 ...
3
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8answers
97 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% / ...
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2answers
39 views

is it possible to run bootp/pxe server using dnsmasq without act as dhcp server

on my network its already exist a router that do dhcp, boot in this network i need to boot a diskless system that use pxe to boot from network, while the pxe server is using dnsmasq to serve O/S, but ...
5
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1answer
92 views

Understanding service --status-all output

I am trying to understand the output of the service --status-all command on Ubuntu 13.10, since the man page doesn't explain it. For example: [ + ] rsyslog [ - ] sendmail [ ? ] sendsigs [ + ] ...
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0answers
18 views

IPSEC on linux with multiple remote ISP

I have configured 2 ipsec VPN connection from my linux server to my clients locations. the reason being the client has two ISPs a primary and a secondary on. The client wants to switch to secondary ...
0
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0answers
25 views

Sharing Linux hosts between multiple users [on hold]

We have numerous Linux machines in our lab shared between users of several departments. From time to time there is a situation when one user starts using the machine that is already taken by someone ...
1
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0answers
69 views

Haproxy using 10GB Memory and 100% CPU with 50k connections

On a Ubuntu 14.04 x64 server, Haproxy uses 3.3 GB of memory and 6.8 GB of swap, while handling 52k connections. The CPU usage also keeps spiking to 100% before most of the traffic was redirected to ...
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1answer
31 views

How to setup a domain on a Linux Server? [on hold]

I would like to setup a domain name for my linux server. I can currently access it as an IP, but for public it would be easier by a domain. I already bought it, it's on namecheap. I want to set it up ...
0
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2answers
30 views

Where is the configuration that instructs linux 14.04 to enter single user mode?

I have an EC2 Instance of Ubuntu 14.04 Fails to restart after stop/restart. It was upgraded from 13.x and apparently AWS has the web ui setup to send a 'reboot now' command which instructs 14.04 to ...
0
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0answers
11 views

XMLRPC.PHP file on Wordpress DDoS attack [duplicate]

Getting TONS of these in apache access log: 41.99.38.36 - - [19/Jul/2014:20:58:15 +0000] "POST /xmlrpc.php HTTP/1.1" 403 436 "-" "Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)" I ...
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votes
2answers
38 views

Which tools do you use to collect information when the application is down on the production server

I have an application(multithreaded) which is developed in C running in the production server. Recently, my application got into the hang state for 5 hours and we could not notice it. So, we ...
0
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0answers
16 views

openVPN on TCP 443 + sniproxy only for certain IPs - is it a way to do it?

I'm currently running sniproxy and https server. If user is known (IP is known) iptables just allows connection to sniproxy which redirects user to desired website or local https server (127.0.0.1 ...
0
votes
1answer
89 views

Strange POST request to server in apache log

I have been seeing this all day in my apache access log: 213.55.105.126 - - [19/Jul/2014:18:39:24 +0000] "POST /xmlrpc.php HTTP/1.1" 503 2539 "-" "-" they are continuously coming in. different IP ...
2
votes
3answers
204 views

How to increase swap space on a live server

On Ubuntu 14.04, the swap file has to be increased as the memory and swap usage are reaching 100% usage. On a live production server, can the swap be increased with minimal disruption to the service? ...
0
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0answers
17 views

ssspl proxy server not working

So I install sss.pl following the guide found here http://ssspl.sourceforge.net/#install And when I run the line ./sss.pl 456.234.234.23 1080 WillB:ae2b1fca515949e5d54fb22b8ed95575, I get an error ...
0
votes
0answers
28 views

keep alive a multiprocess linux service

I would like to know how I can have a multi-process service, running in Ubuntu, automatically respawn when one of the processes crashes. I found this method for doing this with a single process, ...
0
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1answer
41 views

Configuring a linux machine for high inbound network load

I'm running Ubuntu 12.04 on an a dual processor Intel E5-2620-HexCore, 64GB of RAM, 1Gb network link. When downloading a single test file from a location in the same datacenter (Public network) I get ...
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0answers
11 views

Cleanup after debconf-set-selections - no interaction installation

I have a problem with debconf-set-selections command. After I install percona server on my machine root password is located in several cache files. I am not sure if i can just delete this files or ...
3
votes
2answers
83 views

Use of rpm and yum for application installation in large installation environment

Our very large organization has developed a standard for hosting of applications which dictates that the application and all components on which it relies must reside in a dedicated application volume ...
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0answers
18 views

network trouble with hp bl465c g7 and rhel6.5

I have an HP BL465c g7 that worked fine with RHEL6.3. After upgrading to 6.5 the network stopped working. Can ping itself but no the gateway or anywhere else. IPtables are clear, eth-tool reports a ...
0
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1answer
24 views

Can high disk cache usage lead to external fragmentation and ultimately to page allocation failures?

We're getting page allocation failures on a Linux server (3.2 kernel). We've been told the problem is directly related to the high use of the memory for cache; this would lead to external ...
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0answers
11 views

Booting a Raspberry Pi from an NFS share [migrated]

I am trying to boot my Raspberry Pi using an NFS share. I have copied the boot partition of the Raspbian Wheezy image to the SD card and copied the root partition to a networked hard drive. I have ...
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0answers
25 views

barebone linux OS for virtualization [on hold]

is there any basic linux based operating system to use as barebone layer for virtual machines? I'm searching for a such system to install on my laptop in order to have many virtual machines with ...
1
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0answers
21 views

ping: sendmsg: Operation not permitted (sometimes)

On a Ubuntu 14.04 running Haproxy, after a service haproxy reload, Haproxy is suddenly reporting all servers behind it as down. After some digging around, I noticed that ping is not working properly, ...
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0answers
7 views

LXDE Desktop shortcuts layout configuration files

I am working on Lubuntu 14.04 LTS with LXDE Desktop Manager and I would like to change default Desktop icons layout. (These are shortcuts for some application). By default, these icons are layered at ...