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

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raspbian linux box hung - how to obtain more information remotely

I've got a raspbian linux box that I know is up, because it responds to an attempted ssh connection, but it responds very slowly and gets hung on password prompt. I have a suspicion that it is ...
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9 views

openssh-server wont install on linux server, any ideas? [duplicate]

So, my server recently got broken into, and to stop any possible sshd backdoors, I attempted to reinstall openssh-server... this broke ssh. I'm still connected, but cannot reconnect from another ...
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7 views

.bash_profile command_not_found_handle / ssh

You like or is this madness? If the command is not found, then ssh $command. I've used this for quite a few years with no unexpected results. I will readily admit however, that unpredictable ...
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5 views

Apache2 Disallow access to the whole server

On my VPS, I want to block access of certain IP addresses to the whole server. I have for example these websites (document roots) /var/www #the VPS website itself /home/eve/www/evesite.com ...
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12 views

IPtables: block fragment type “DF” don't fragment

I'm getting some DDoS attacks and I need to block the packets with UDP flags "DF" using iptables, or another packet filtering method. I think u32 can do it, but I don't know how to check the "Don't ...
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16 views

SYN flood on mysql server

Consider this structure: DB <-TCP3306- WEB{1,2,3,4} All servers are CentOS 6/7 Web servers are running PHP (using php-fpm) that connects to the MySQL server. Occasionally, I get this error ...
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18 views

Multiple Linux updates and virus monitoring

Hello serverFault community, As my network of server becomes by the day, I was starting to wonder if there is already some kind of software that exists to help with the "Security" side of it. There ...
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1answer
14 views

How to configure a New Relic agent to notify about out of date software on a Linux server?

All of my servers have a New Relic agent installed and I'd like to use this infrastructure for guarding against out of date software, and in particular against security patches that exist but are ...
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1answer
17 views

How do I host a registered domain with bind9?

I'm already hosting my own web server, FTP, etc. and I want to be able to link my domain name myself directly instead of configuring all subdomains and redirections on the registrar's DNS. Is it ...
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0answers
22 views

Why server shows time out for 5 second then connecting in redhat linux

I have a DHCP server configured in Red Hat linux , there are two NIC Cards there , one connected to LAN and other connected to WAN , But i am losing internet for 5 second in one minute and this cycle ...
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14 views

making copy of one server to another

I have three identical hardware machine. I want to install and configure centos server on all machine. I need to have exactly same configuration. After some research,I know there is a way of making ...
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8 views

Do I need acpid daemon in virtualization guest?

I get VPS with KVM virtualisation (server for hosting services). I remove most of desktop services (like dbus, consolekit, xorg) because of security and stability concern. Guest run on virtualised ...
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8 views

How to make paravirtualized xen template

I want to know how to make my own linux OS (CentOS, Fedora, Debian, Ubuntu, Gentoo, Slackware) template compatible with paravirtualized xen with pygrub kernel, ext4 filesystem and xvida device I ...
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0answers
8 views

Connect windows server with Linux LDAP

i have Servers with windows server 2012 i need to connect these servers to my Linux LDAP in order to take all my windows server authentication from Linux LDAP. please can any one help me .
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20 views

How to start PV Xen Guest

I am new in Xen virtualization system and i am trying to learn everything about it so i can use it instead of Openvz In Openvz i can start and stop vps by running vzctl start <VID> vzctl ...
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13 views

When s3cmd checks a bucket with thousands of files to sync it, does this count as one list request or thousands?

Trying to figure out pricing here so I don't get overcharged. I daily run a backup script where s3cmd checks a folder with over one hundred thousand files to see if any have changed (which by the way, ...
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2answers
31 views

Using Screens with a PHP Script

I found an external developer to make me a PHP script to 'snipe' Mineraft usernames. In order for it to operate, I have to start the script from the command line using this: php -f sniper.php > ...
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4 views

Linux stuck on boot up, windows bootloader overwritten [migrated]

Ahoi. I recently installed debian on my windows 10 machine, and have essentially bumloved my entire machine, it seems. I installed Debian using the 8.3.0 DVD Image from the official site, and the ...
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2answers
39 views

What are front merges in I/O scheduling and how can I tune this parameter?

My Linux uses the Deadline algorithm for I/O scheduling. One of the parameters is the front_merges parameter under /sys/block/sda/queue/iosched/front_merges. By default it is set to 1, which means ...
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6 views

eCommerce combined Webserver and database server or Docker instances [duplicate]

I get a server with 2x QC and 16-32GB RAM now I would like to host a eCommerce Platform and I ask me which solution would better if I have a combined Webserver and DB Server or If I have two docker ...
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12 views

How to connect to mail server in C [migrated]

I tried to make a connection to my mail server which is in local area network. The ip of mail server is 192.168.1.1. So, I tried the following program to test that. Program: #include<stdio.h> ...
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12 views

Is there any way to restore an entire previous version of a folder in an s3 bucket?

I know folders are not folders within S3, but it would be extremely useful if you could restore a previous version of one when you have versioning enabled. I've been looking at it and I can only see ...
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11 views

Monit “check program” and restart based on exit code

When I use check process, monit will start the program I define under start program then monit will restart it if it stops. But when I use check program monit will not automatically start it. If the ...
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1answer
36 views

Running a powershell script on a Linux server

We wrote a powershell script (.ps1) that basically runs a snmpget and a nnmsnmpget commands. It works great on all Windows 2008 servers but can't get it to work for any Linux servers. Yes, it's run ...
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1answer
23 views

How to set icinga2 downtime across midnight

Our backup is running between 22:00 and about 05:00 the next day. I could not figure out how to set this in a scheduled downtime with "apply ScheduledDowntime" in icinga2 (r2.4.1-1 on opensuse 42.1). ...
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18 views

how to redirect domains to localhost iptables

i wanted redirected all the traffic on my network to localhost. currently i am trying to use iptables to do so from below command.. iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j DNAT ...
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24 views

Automatically Deploy Windows Print Server Printers to Clients

Using CUPS with linux clients, configuring clients like this: $ cat /etc/cups/client.conf ServerName <printserver-hostname> $ cat /etc/init/cups.override manual means any changes I make on ...
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11 views

nfs-kernel-server keeps failing in Ubuntu

I'm trying to create NFS share in Ubuntu 14.04 strictly following this tutorial: https://help.ubuntu.com/community/SettingUpNFSHowTo. root@srv:~# service nfs-kernel-server start * Exporting ...
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10 views

How to get rid of unexpected nslcd related messages caused by resolvconf?

I'm on a Ubuntu 12.04 based system. Our system is setup to use nslcd to allow LDAP authentication. In syslog we see lines like this: /var/log/syslog.1:Dec 20 06:25:11 T53-1014-014 nslcd[1496]: ...
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24 views

Nagios check_jstat

I'm trying to monitor java memory usage using nagios nrpe features. So I download and install check_jstat and install the plugin on the remote server. And when I ran it below is the result: OK: jstat ...
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13 views

Can we write an custom check for monitoring a process with Data Dog

I want to write an DataDog Check to monitor some process like Puma, delayed_job etc, I can see there are ready plugins available for these for nagios and Sensu but not for DataDog, But can I write my ...
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18 views

http conf setting to redirect pages

I have an old url ext.examplecom/xyz-abc/ which i want to redirect it to permanent address ext.examplecom/xyz-abc/newlink/ when i type url ext.examplecom/xyz-abc/ it gives me error The requested page ...
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1answer
45 views

Find network percentage of NIC [on hold]

So I have created a Linux resource monitoring tool that pulls various resource information. One of the fields I am trying to pull is the percent of network throughput on my NIC. So if I have a 1 ...
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29 views

network access issue and triage

We have two hosts in same vlan with same route rules. One of them is able to connect to an outside IP while on another I get failed: Connection timed out when testing the connectivity through netcat. ...
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14 views

How to change $PATH for crontab in Opensuse [duplicate]

I have a script written which works perfect on terminal however gives error when called through crontab. It took me a while that the problem is with the cron environment not my script. so I tried ...
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13 views

How does Qemu handle memory?

I'm having a real hard time understanding something and I was wondering if anybody has any experience with this and is able to help. I have two KVM VMHosts, one running qemu 2.4.1 and the other ...
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1answer
24 views

Identifying files being actively written to CIFS share

Is there a way to identify files that are actively being written to a CIFS mount in Linux? I am interested in skipping those files. My first thought would be to fine tune the find command with ...
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28 views

Connection issues after separating database from the web services

We had performance issues where server would run out of resource and decided to move database onto another server. It seems to work but crashes every few minutes with the following errors: Warning: ...
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13 views

Jail php (nginx + unix socket) in a folder

I have to store two php applications in a single server. Following my current setup: /etc/php5/fpm/pool.d/app1.conf [app1] user = app1 group = app1 listen = /var/run/php5-fpm-app1.sock listen.owner ...
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9 views

tunel trafic (via vpn) if its going out of specific interface (with private IP)

os: linux I would like to create some interface with private IP like 192.168.0.100 and make some software bind on this interface/ip (that I can do). This software makes outbound connection to ...
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3answers
31 views

How to use iptables or tc to limit packets per client.

I have some problem network clients which send data too fast. I want to slow them down, using iptables, or possibly tc. I've seen iptables solutions like: sudo iptables -A INPUT -m state --state ...
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1answer
21 views

how to find out the clients connects to the proxy server in redhat linux

Is there any way to find out the client machines connected to the particular proxy server in redhat linux , i am using redhat linux version 6 and squid configured in it
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9 views

Is host process listening on virtual interface added to virtual switch possible?

I have a working setup of three virtual machines (on VirtualBox) bridged to tap devices added as ports to Open vSwitch. They are able to communicate. Now, I would like to make a host process (one ...
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1answer
24 views

Checking RAID events log or history of a Smart Array P400 in a HP ProLiant DL380 G5 server

In a rack-mounted HP ProLiant DL380 G5 server, running Linux (RHEL - Red Hat Enterprise Linux Server - version 5.9, 64-bit): after a shutdown and power on, one of 4 hard disks of a Logical Drive using ...
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10 views

unable to connect google cloud compute engine ssh with browser or root parttions is full

I try to log-in ssh browser with google developer console but i am not able to connect and other user have no root permission to remove and delete the files. I checked from other normal user,root ...
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1answer
45 views

TCP connection; ACK not received

I am having trouble sending mail from Linux to Exchange server. When I telnet from Linux to Windows on port 25, I am not receiving any message from Exchange. The connection is automatically terminated ...
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23 views

Custom oracle linux 6.7 image on google cloud hangs at 'Booting from 0000:7c00'

I am trying to create a custom oracle linux 6 image on Google compute engine. I followed all the steps as described in the google instructional videos here ...
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1answer
29 views

Seperating web server from database over public network

How much of a risk is it splitting nginx web server from mysql database server and having them talk over public network? The database server would be in the same OVH DC but from what I understand ...
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0answers
13 views

dadcomputer.home appears as dadcomputer.lan when logging in to another computer [on hold]

I changed ADSL router recently (from BT home hub 4 to technicolour tg582n) and now dadcomputer.home (ubuntu) appears as dadcomputer.lan when logging into my freeciv server, or SSHing into another ...
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4 views

Dell R710 OS install [migrated]

I just bought a couple Dell R710s on Ebay for a home lab and want to install Debian as the main OS. Im new to dealing with server administration aside from Development stuff. I am wondering on where ...