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

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Newly setup Centos 6 server, cloning from .GIT as user other than ROOT

Apologies for being so new and lost, i'm brand new to all of this and the more I search the more I feel I'm getting closer, but then realize i'm lost. I setup a CentOS 6 server on an Amazon E2 ...
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0answers
3 views

tomcat start/stop service for non privileged user

I am trying to allow a non privileged user to start /stop Tomcat service only. I tried researching online and found that this can be done by editing /etc/sudoers with the below lines: user ...
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0answers
7 views

Is there some good open source Thin Client OS? [on hold]

I've tried several Linux Distributions to act as the Thin Client OS to use spice, but all of them are way too large, for example, Ubuntu 14.04 server takes almost 1000M after installation and it ...
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1answer
12 views

Did grub updating bring my server down?

I have an Ubuntu 12.04 server. Last night I installed a few updates using apt-get dist-upgrade, including grub, and rebooted. After rebooting, I couldn't boot into Ubuntu. I just get a big flashing ...
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0answers
8 views

Is it possible to use Docker or Vagrant to provision a physical machine

Currently at my work we use buildroot to provision physical machines with Debian linux. Buildroot compiles a rootfs.cpio.gz file which the machines to be provisioned pick up using PXE, runs a script ...
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2answers
41 views

Is it possible to force a linux install to continue?

I'm PXE booting a linux distro that I'd like to contain a list of packages. I have these packages listed in a kickstart file for inclusion. Some of these packages won't work with the current distro, ...
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2answers
40 views

Rotating DNS servers specified by DHCP

I've got an OpenStack cluster running with about 200 CentOS instances and I've gotten a complaint from my hosting provider that the DNS traffic is getting to be too much for their servers. To address ...
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0answers
27 views

ip route get recognizes address as anycast

# ip route get 1.2.3.4 anycast 1.2.3.4 dev eth0 src 5.6.7.8 and the question is how does it know the address is an anycast ? (which apparently is true).
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4answers
343 views

Hot spare host vs cold spare host?

We have several hosts where we have an identical host spare host, which is patched and updated so it is very close to have to same software and config. In case of failure the network cable is switched ...
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1answer
36 views

how to add a user on 100 servers when there is no NIS [on hold]

How to add a single users in all the 100 servers When there is no centralization for adding users. What would be the best way to add users in all the 100 systems
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1answer
25 views

Upgrade to Wheezy - CUPS printing to lpd printers is 6x slower

We have Debian Squeeze 32-but servers that print PDFs to Xerox DocuColor printers. The PDFs are processed in about six seconds. We are in the process of upgrading our servers to Wheezy 64-bit. We ...
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0answers
22 views

How do I setup a runit service in Centos which is initially stopped

I have a service called 'hello' which I would like to run on CentOS release 5.8 (Final). However I would like it to be initially stopped. The service is a runit service which looks like this ├── ...
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0answers
26 views

What's the different between CentOS6 and CentOS7 GA [on hold]

What's the different between CentOS6 and CentOS7 GA. Apart from kernel and GUI and anaconda installer, what are major different.
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3answers
37 views

How to find out the cause of linux server crash after rebooting

Here is the deal, come to work only to find out one server isn't responding at all, the machine is turned on, but the screen doesn't show anything att all, doesn't respond to keyboard inputs (I don't ...
3
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1answer
24 views

Puppet: how to run an exec only if puppet has made changes

We are doing basic management of some servers via puppet - The servers themselves run as part of a clustered system that handles other aspects like user accounts etc and includes a monitoring script ...
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1answer
35 views

Allow user to bind only certain ports on Linux

Welcome, I'm looking for equivalent of mac_portacl from FreeBSD. I want to assign to one user only certain ports. Filtering it by iptables isn't enough, because when process works, the port is blocked ...
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0answers
10 views

SMART output - what's the significance and meaning of “verify” errors from smartctl -a for a HDD

Does anyone know the meaning of "verify" errors listed in the output of smartctl -a (or more precisely smartctl -l error), as well as their significance, if any, in trying to evaluate the health of a ...
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0answers
15 views

What's causing high CPU load by kjournald process?

I'm running CentOS 5.4 (Final) server as my PDC and Windows file server. Until earlier today, the server has been running non-stop for over 6-months (since the last reboot). The problem now is that ...
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0answers
15 views

how to use --rdest flag in recent table

Here is why I try to accomplish: When receiving a UDP packet, put IP address of the source address in recent table. sudo iptables -A INPUT -p udp --dport xxxxx -m recent --set -j ACCEPT When send ...
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1answer
47 views

How to handle security updates within Docker containers?

When deploying applications onto servers, there is typically a separation between what the application bundles with itself and what it expects from the platform (operating system and installed ...
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1answer
33 views

How should I properly block outgoing http traffic with iptables

I'm experimenting with iptables, and I'm trying to allow all outgoing requests for HTTPS, but to block HTTP. I have the code below; Chain INPUT (policy ACCEPT) target prot opt source ...
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0answers
27 views

Route public subnet to client over openVPN

I want to route a public /29 subnet over vpn to a client with a natted ipv4. After doing some research, I can't figure out to make that work. Maybe I was searching for the wrong terms, but it seems ...
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1answer
30 views

Linux read disk cache and NFS

I am interested in the impact of the read disk cache on accessing a file through NFS. Lets say I have a file on NFS. I access it (do "cat myfile") from a linux host "A". If there's enough RAM a file ...
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0answers
27 views

Why timeout not work in the expect script

I created the following script in order to automate the VPN process. This script runs vpnc and enters a password. #!/usr/bin/expect set PASS [lindex $argv 0] set timeout 10 spawn vpnc ...
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1answer
24 views

Linux NFLOG - documentation, configuration from C

Several different places (e.g. http://wiki.wireshark.org/CaptureSetup/NFLOG) recommend using Linux's "NFLOG" firewall module to capture packets generated by a particular UID, like this: # iptables -A ...
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2answers
33 views

View realtime list of connections to Postfix

I am running Postfix on a linux box with a couple hundred local users with mailboxes. Is there a way to monitor all incoming connections (SMTP) to the Postfix service? I.e. a live stream of "IP ...
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2answers
45 views

How should privileged accounts be secured in both Linux and Windows?

I have recently started work in application security at a mid-sized firm, having transitioned away from 5+ years in security consulting (pentesting, etc). One of the biggest challenges I see here from ...
3
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1answer
41 views

I just deleted /etc/rc?.d/ dirs, how can I restore/recreate them?

sysv-rc was installed to get a hold of systems autostart, but in the end it wasn't needed (as update-rc.d came in handy). So I dumbly do apt-get purge sysv-rc and type Yes, do as I say! to the apt ...
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0answers
20 views

command line alias inside php exec

Is there any possibility to define shell alias for commands executed via php system, exec etc functions? I'm running multiple versions of PHP using fastcgi and I need to run the right version of PHP ...
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0answers
12 views

Opensuse 13.1 - Encrypted Partition Vanished

I installed a second drive in my machine running OpenSuse 13.1 and created an encrypted partition. I was able to use the partition after doing so and after reboots, no problem. Now my system can see ...
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0answers
13 views

Turn on/off proxy pass in nginx if a particular header is set

For testing purposes (in particular I'm developing a performance analyzer for a website that currently runs in production) I need to have some endpoints (es: /performance) that should be processed by ...
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1answer
22 views

linux + rcp rsh post configuration after installing rsh package

I installed by yum the latest rsh package ( because on my linux machine rsh and rcp binaries not exists ) # yum install rsh so I verified by: rpm -qa | grep -i rsh rsh-0.17-60.el6.x86_64 ...
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1answer
17 views

SVN customize 403 error message

How can I customize "403 Forbidden" message? For only this message I want add additional info, like this "403 Forbidden (you have no rights to [URL to repository])" . How to do it? I want to save ...
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2answers
18 views

Can increase in hdd size slow sown a linux server?

We have a code build server, fedora 13, which was working at medium speed for 4 users. Speed means building a code branch took 1.5 hrs max duration. It was having one quad core, 8gb ram, 200gb hdd. ...
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0answers
10 views

Is it better to use the systemd service unit's Restart & RestartSec, or use a systemd timer unit?

I have a couple of in-house automated scripts running at periodic intervals. One is every five minutes, the other is every minute. They don't really need to be ran on-the-dot; e.g. I don't care if ...
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2answers
32 views

How to monitor and list modified files server wide for brief periods of time?

I would like to, from time to time, enable server-wide file monitoring that will show me all files being modified, updated and created while I have it running and thus simply spewing forth a list of ...
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0answers
30 views

Linux server backup to Amazon S3 using SSL

I have Linux box CentOS 6.5 and i want to backup daily files like SQL dumps and config files to Amazon S3 I have installed Ruby and S3Sync. But the problem when running the s3sync with these ...
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0answers
81 views

Growing OS cache in RAM causing high system CPU usage

Long question, so please bare with me: I'm having a weird issue with a server that I've never seen before. On a machine with ~30G of RAM with an application that takes ~10G (spread across hundreds of ...
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1answer
27 views

Deleted File, Available Space Did Not Return [duplicate]

On CentOS linux, I just deleted a large log file over 3gb on XFS file system. After deleting the file, the available file space did not return to the drive seen via df -h. Is there anything I can do ...
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0answers
20 views

sip from command line

I am definitely remember, that somewhere on freeswitch.org site there was an example of how to initiate a SIP call from command line. It was not by using sipcmd, but either some general linux commands ...
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2answers
26 views

Puppet node does not pull changes from master

I have followed the following three How-To's http://terokarvinen.com/2012/puppetmaster-on-ubuntu-12-04 https://help.ubuntu.com/12.04/serverguide/puppet.html#puppet-installation ...
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0answers
12 views

There are multiple 4 kernel images in grub how to load specific kernel image by default during boot [on hold]

In the grub menu there are 4 kernel images how to load the 3 by default without selecting manually what changes need to be done in the grub.conf
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32 views

Autofs mount problems

I need a suggestion how to configure autofs to mount a windows share automatically to CentOS. I can successfully mount the share, but I can't seem to enter parameters into auto.master corectly. ...
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5answers
69 views

How do i down the server on the remote location for an hour

This is the doubt i have in my mind we can reboot the remote server using reboot command but how can we down the server for an hour or a specific time. In our case we login to the server through putty ...
1
vote
1answer
16 views

how to add a raw device on RHL

I am using a server to which someone added a harddisk. I am struggling to get this to work. I am a regular Linux user (but haven't done this stuff before). I have googled up and tried to follow the ...
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2answers
41 views

Something like `top` for vhosts

Is there any way of establishing what vhosts are keeping Apache processes busy, in real time? Ideally I'd like a tool like top (or htop) that shows me which sites are busiest, or most costly, right ...
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How to force postfix follow (dns) mx priority even for local domains on Linux Ubuntu Server with Plesk

Use Case Scenario I have a Linux (Ubuntu 12.04) with Plesk (11.5) hosting server where some clients use the server's mail service only as a failover. They set up an external mail server with higher ...
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2answers
30 views

Performance hit from moving DB to another drive symlink?

We're considering moving one database (there are 4 of them in total) with InnoDB tables, to a separate partition in a Ubuntu 14.04 VPS. This DB gets read/write intensive (500 writes per sec, about ...
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1answer
26 views

Anonymous User Can't Delete file from ftp

I've created a new directory in /var/ftp with the name uploads the owner and group of this directory is ftp the permissions are set to 777. Content of my vsftpd.conf file anonymous_enable=YES ...
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14 views

runnning systemd without PrivateTmp, PrivateNetwork and PrivateDevices (in docker - unprivileged mode)

I am happily running systemd inside a docker container, however, it requires CAP_SYS_ADMIN in order to dynamically create private tmp mounts. I have attempted to disable the PrivateTmp, ...