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

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Performing DNS queries starting with one of the root servers using dig command [on hold]

I am having trouble understanding the question for my network assignment. The question states: Discover the sequence of DNS servers your local DNS server with empty cache goes through when it ...
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0answers
10 views

How do I forward/NAT all traffic to one interface to give internet acess for clients in ap? [on hold]

Im trying to setup a router in my debian vbox virtual machine using an usb wireless adapter in at0,and a bridged adpater in eth0,i'm using airbase-ng and isc-dhcp for leasing ips,the point is all ...
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0answers
15 views

Could a missing library be causing this message to appear? [on hold]

I recently tried to run a certain function from a program (it's pre-compiled and I don't have access to the source for it) and was met with this message: Could this possibly indicate that a library ...
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1answer
16 views

Captive portal and SSL

I think similar questions have already been asked over and over, but my question is slightly different. I understand I can't redirect HTTPS traffic to the Captive Portal landing page without causing ...
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0answers
11 views

Site images lost/cropped, was this an attack, looking for clues

I am still putting things together to get this sorted, so apologies if I fall short on details. I am looking for your help to identify what actually happened. I take care of an eCommerce shop. ...
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0answers
23 views

Why do I get a list of root name servers when doing an nslookup to one nameserver and not another

I have two bind9 servers, ns1 and ns2 I have a test domain called test.test whos apex is 1.3.3.7 When I nslookup ns1 (master) I get: nslookup test.test ns1.domain.com (root) nameserver = ...
7
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2answers
917 views

Very strange file size (more than 600 PB) on a small filesystem

I had a file on an XFS filesystem which size was about 200 GB. It was a QCOW2 image containing a virtual disk of a KVM-driven virtual machine. Something went wrong (maybe it was some glitch of ...
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4answers
44 views

Internal DNS for internet access

I have configured a internal DNS for my office network using BIND on CentOS6 ... The problem I am having that when I use that DNS server as a primary DNS my entire network loses internet connectivity ...
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0answers
9 views

My Server trying to find known vulnerabilities in other server [duplicate]

I got mail "Abuse message" Greetings, We have detected abuse from the IP address MYIP.XX.XX.XX, which according to a whois lookup is on your network. It seams to be trying to find ...
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0answers
16 views

IBM System x3850 M2 Ubuntu Server Install

I just purchased two second-hand IBM System x3850 M2 rack servers, and I am a real noob to the subject. As such, I cannot tell if there is a major difference between x3850 M2 and x3850 X5. If there ...
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1answer
8 views

is there a way to pretty print the output of “ps” to include the “rss” memory value?

I have a python script which takes in processes in csv format and decides things based on what's running, it's name, and how much cpu time it's using. I would like to add processes that also use lots ...
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0answers
9 views

RHEL 7 lock screen freezes

I've just installed RHEL 7 into hyper-V for some testing of a linux application. To my dismay, I find that the console freezes up when the desktop locks. I can Alt-F2 to get a tty, then gdm-restart. ...
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1answer
15 views

Linux showing wrong disk space used, du -h -x / | sort -hr has different space

If I type: df -h It shows me 12G used. But If I use this command: du -h -x / | sort -hr >> /home/log_size.txt This will give me: If I sum /usr + /var + /root, this won't give me ...
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0answers
4 views

samba full audit: meaning parameters

I have set full audit in samba, but there are some parameters that would like to know exactly what they mean Full audit full_audit:prefix = %I|%m|%S full_audit:success = mkdir rmdir pread read ...
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0answers
21 views

Permissions denied to directory owned by a user

I have a similar problem to that posted here, in that a user is unable to access the contents of a directory they own. A quick search shows quite a few other similar questions, however the problem ...
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0answers
22 views

In a virtual lab environment, I have a pxe server timing out

I've built a pxe server using CentOS 7. The client times out with a message of: Connection timed out (http://ipxe.org/4c126035) When I look at that link, it says 528 rc = -ETIMEDOUT;, but ...
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2answers
175 views

How to keep access keys safe in the event of a compromised server?

What's the best strategy to keeping access tokens secure in the event of a compromised server? Let's say I have a Linux web server to which I regularly ssh into. There is a variety of critical access ...
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0answers
4 views

How to programmatically change a password on an IPSwitch server using a Linux client? [migrated]

One of my companies customers runs an IPSwitch sftp server, and they have disallowed public key authentication, and require us to change our password every 90 days. The problem is that, I cannot see ...
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0answers
15 views

Gluster for replication/propagation

Say I have a bunch of servers that access a gluster mount to serve files via http. Files are sourced internally, and are copied from an internal server to the gluster mount on one of the download ...
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0answers
8 views

Adding trusted root certificates to the server cent os

I m trying to install a root certificate in my cent OS box. I did the following Enable the dynamic CA configuration feature: update-ca-trust force-enable Add it as a new file to ...
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0answers
8 views

Munin graphs not being removed from html page after plugin removed

I have a munin server and many linux nodes. That all works fine. I wrote some custom munin plugins. They worked. They appeared on the munin html page. I have since deleted those plugins. However my ...
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0answers
21 views

FTP Server - Prevent Uploading Files Named with Certain Characters

Is there a way in FTP to prevent clients from uploading files named with certain characters? or to accept only files named with specific characters? Example: accepted file name should only contain ...
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0answers
16 views

ThinkServer x3550 M3: AES-NI disabled?

We are running a x3550 M3 with Ubuntu and we wanted to enable AES-NI functionality. First, we checked whether it was enabled already by executing: # grep aes /proc/cpuinfo However, no aes flags ...
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0answers
13 views

Migrate logcal linux users to FreeIPA ones

We have several Linux machine (running various versions of Fedora and CentOS, but that should not be relevant) with local users. Most of those local users are the same login name but might have ...
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1answer
22 views

How to remove injected code between two strings recursively in PHP files using SSH

We have in-house Linux(Ubuntu) development server. Few days ago suspicious code was injected. Just to mention here that we have more than 300 projects. Code is injected in almost every file ...
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1answer
22 views

passwordless ssh in VM - weird authorized keys file

I am trying to setup passwordless ssh to my localhost (itself). I have host machine PM1 and then I lauch a VM(vm1) using qemu-kvm and logged into VM. Then, I am trying to setup passworless ssh within ...
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7 views

conntrackd not syncing with external cache off

I have two firewall gateways that I want to work in active/active mode with conntrackd connection state syncing. Well, when I am using conntrackd with external cache on, connection created in one ...
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0answers
9 views

Linux at command logging [duplicate]

For Linux, specifically CentOS, is the command executed by 'at' logged anywhere? If so, in what file would the command be logged? I looked under /var/log.
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0answers
45 views

Allow ssh when g+w on user's home directory

Is it possible to allow one user to connect via SSH when that user's home directory is g+w? As I understand it, I can allow this if I set StrictModes no in /etc/ssh/sshd_config, but that would mean ...
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0answers
8 views

NAS JBOD2 2 Drive Raid 0 Enclosure Failure Data Recovery

I have a Caldigit Enclosure that had 2 2TB Sata Hard Drives in the unit. The Enclosure seems to have failed during a data recovery operation where the partition was lost during a power failure. I am ...
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24 views

How to write access command with credentials?

We had a third party company setup servers and built services for us years ago. But the relationship is strained now and basically they won't reply any email to us. We could find some legal help but ...
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1answer
22 views

How do I tell Nginx to pass requests to different apps based on the incoming url?

How do I tell Nginx to pass requests to different apps based on the incoming url? For example, mybudgetapp.com and myshoppingapp.com both point to my server where both apps (8001, 8002) and Nginx ...
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1answer
16 views

How do I view the contents of transport.db file in Postfix without the original transport file?

A Postfix server was given to me with a transport.db file, but no original transport file from which it was derived? How do I determine what the original contents of the transport file were?
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1answer
16 views

How to change the linux startup services order in SUSE 11

In RedHat and Centos changing the startup scripts as stated here worked perfectly fine. But Suse seems to follow different rules, if so what are the changes need to be taken into consideration? Do ...
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2answers
48 views

Linux: Allow user to execute specific command on behalf of any other user

I am trying to find a way to allow user john to execute a command (say echo) on behalf of another user peter without being prompted for password. I found a thread that I thought would be the answer ...
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2answers
32 views

Route traffic in a public network

I have 3 stand alone CentOS servers on same hosting provider. The hosting company can't offer me a firewall for this devices, only iptables. So I want to buy another server and make this server a ...
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2answers
47 views

Hardware RAID configuration on Linux

I have a linux server with a RAID controller and 6 HD (4TB each). I want to mount a calculus server and I am thinking in two possible configurations: Hardware RAID 10 using 6 HD (only 12TB available ...
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1answer
37 views
+50

Converting Linux machine from XenServer to Hyper-V

I'm in the process of converting the last few on my XenServer VMs over to Hyper-V. The majority of them have been Windows machines and I've done a backup and restore using Windows Backup. For some of ...
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0answers
35 views

Why does my machine not boot? [migrated]

I think this is a HW issue so maybe I'm in the wrong place, please redirect me in that case. History I have a Lenovo 9142 that has been installed with Ubuntu and running as a developer machine for ...
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2answers
24 views

why bind9 gives connection refused for permission denied error when it is 777

These questions didn't help: http://askubuntu.com/questions/172030/how-to-allow-bind-in-app-armor Cannot start BIND9 I wanted to start bind9 and saw that it gives permission denied in syslog as ...
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3answers
52 views

how to change the startup order of linux init scripts in Redhat, Centos

From this changing How to change Linux services startup/boot order? changing the values of the symbolic links it is evident that startup order is changed. In debian derivatives we use ...
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1answer
128 views

Linux command history for multiple sessions by root user

We have multiple guys logged in as root at the same time. How can I view their command history during login or after terminating their session. Regards,
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0answers
23 views

iptables to do source nat for response packets

I am trying to do source NAT for all outgoing packets (packet initiating connection from my machine as well as responses to other connection). I put in following rule: iptables -t nat -A POSTROUTING ...
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0answers
40 views

raspbian linux box hung - how to obtain more information remotely [on hold]

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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0answers
16 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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1answer
20 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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0answers
20 views

IPtables: block fragment type “DF” don't fragment [on hold]

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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0answers
30 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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0answers
35 views

Multiple Linux updates and virus monitoring [on hold]

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
15 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 ...