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

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Azure: Name resolution between VMs and role instances located in the same virtual network (Linux)

I have deployed two ubuntu (14.04) machines with different cloud services in a virtual network (with default configuration). Now I would like to get the private ip of one of the machines from the ...
2
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1answer
61 views

Protecting against a DOS attack

Someone is DOSing my server. It is not a DDOS attack as there is only one server involved in this attack. I simply put following iptable rule to drop all the packets coming from the attacker: ...
2
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3answers
200 views

Cost of running a specific server based on consumption

I have ventured across many sites in the last 3 days with no real definitive answers. Attempting to price a near to true value of the running cost of a specific server based on consumption and not ...
2
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1answer
56 views

Mounting degraded RAID

I've finally managed to assemble my RAID10 array again. I'm hoping there might now be a way through this. (There is history, if anyone is interested). I'm now getting: # cat /proc/mdstat ...
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1answer
39 views

route traffic directly without vpn while the vpn still connected

I have a box with fedora, connected to vpn, forwarding done by iptables, every thing is fine, and it is always connected, vpn interface is ppp1, connected through the pppoe interface: ppp0, but ...
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0answers
27 views

How to unlink a symbolic link CentOS? [migrated]

I am still fairly new to CentOS 6.5 and linux in general. In my haste to remedy a solution, I created a link from a suggestion online without thinking much about it. However I need to remove the link, ...
1
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1answer
35 views

Nginx whitelist file extension

server { listen 80; ## listen for ipv4; this line is default and implied #listen [::]:80 default ipv6only=on; ## listen for ipv6 server_name public; root /var/www/public; location = ...
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1answer
41 views

Recovering data from a drive

I have a server that was running Centos 6. It's been humming along for a few years and I have been backing up data off it on regular basis. All of sudden, and after a reboot, it came up in read-only ...
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1answer
44 views

Why i can't access computers in LAN behind OpenVPN server?

On ESXI server i have several VMs: one with external ip address (and internet access), that is configured as NAT (and plays OpenVPN server role) and several VMs in VLAN (using 192.168.182.*/28 ip ...
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1answer
26 views

How to ensure ssh via cgroups on centos?

When some cpu-intensive processes are running on the server, chances are that we could not log in to this machine with error 'operation timeout' via ssh command. According to this post answered by ...
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3answers
64 views

How to disable root-login completely

I have server at OVH that suddenly went offline around 12:10 PM. According to my logs the hacker came in with the root-user. Which means that he probably had my password. I already changed this ...
2
votes
2answers
131 views

Linux Routing with two NICs (LAN vs Internet) with NAT and bridging for VMs

My Setup: There is only one physical machine in this setup, a Host System for Virtual Machines (VMs) with two network adapters. One NIC (eth0) is connected to an internal network (LAN subnet, e.g. ...
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1answer
39 views

Restoring AIX ufsdump on another Unix system

I've previously tried to restore from an AIX mksysb image (question here). I managed to find another set of nightly AIX backups that look to have been made with ufsdump: # mt -t /dev/rmt/1h rew # dd ...
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1answer
24 views

High on %wa from top command, is there any way to constrain it?

Here's my last top info before it stucks: top - 18:26:10 up 238 days, 5:43, 3 users, load average: 1782.01, 1824.47, 1680.36 Tasks: 1938 total, 1 running, 1937 sleeping, 0 stopped, 0 zombie ...
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0answers
42 views

Fail2Ban / IPTables does not block IPs

My server : Debian Wheezy 7.8, Postfix/Dovecot, Fail2Ban/IPTables I've postfix attacks : /var/log/mail.warn Jun 12 08:03:45 myserver postfix/smtpd[8325]: warning: ...
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1answer
31 views

How to do remote server/virtual server management job? [closed]

I have recently learnt about the server management. While looking for freelance job, I have seen a post about managing 1200 servers. I got curious how a group of people can manage some thousands of ...
1
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1answer
32 views

How to block all IPs in CSF except few static IPs?

The title is telling I guess. I'm wondering how to block ALL IPs in csf.deny except few trusted IPs? I've googled but could not find the answer.
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1answer
28 views

sshfs mount using sudo'ed account

We have a linux system ferguson. On ferguson: I have user id a123. As user id a123, I am able to sudo su into userid admin. There is no direct login for the userid admin. We have to use our ...
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0answers
12 views

expect: does “” (spawn_id exp70) match glob pattern [migrated]

I have written an expect script that works perfect for testing passwords on our network until it has looped through my list quite a bit, then the debug output shows that there is nothing to match. ...
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0answers
21 views

Mirror Raid to Single Harddisk ACPI BIOS in the system is not fully compliant with the ACPI [migrated]

My server used to be setup as a Mirror which means the 2nd harddisk would take the image of 1st harddisk. In anycase 1st harddisk is dead, 2nd harddisk would take over. It wasn't setup by me & ...
1
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1answer
66 views

is it possible to search only a files that have specific extended attributes set?

is it possible to search file in the linux OS that have particular extended attribute as this: ---S--l--- ---S--l--- 1 root root 0 Mar 1004:25/opt/csTuner/iba/wys/tuer_lolk What is S ...
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1answer
29 views

vCSA command line installer fails to deploy with the error “Failed to login to host… is not a VIM server”

I'm using the vcsa-cli-installer utility under Linux (CentOS 6) to deploy VCSA 6.0 (vCenter Server Appliance). It is failing with the following: # ./vcsa-deploy -v ~/full_conf.json Start vCSA ...
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0answers
9 views

Reverse X11 Forwarding without SSH on server [migrated]

I want to run an X11 program on the SERVER and display the window on the CLIENT. I have a shell on the server to start with. (This is not an SSH shell, but some cluster computing software) The ...
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2answers
49 views

Running a bash script via cronjob to restart a service

First of all. I don't know anything about bash scripting. second this is a very big problem on my side, and I don't have any idea what to do. Currently, I have this website. which was written in php. ...
0
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1answer
17 views

RSA Fingerprints on EC2 Server Don't Match Locally Generated Fingerprint

I have an EC2 instance with an elastic IP that hasn't changed in a little while, nor has the ssh key Amazon installed in the main user account used to ssh into the server after instantiation. I ...
2
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1answer
96 views

Executing commands on the Ansible host from a handler

I am trying to implement the following scenario in Ansible (v1.9.1): Ansible connects to remote host and uses su to become root. Ansible host fetches remote configuration file that it is about to ...
0
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1answer
32 views

addon domain without cpanel

I've been using cPanel until now, and I would use the feature of Add on Domains, where another domain would point to a subfolder on the public_html.I am now using a VPS server without cPanel. So what ...
1
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1answer
65 views

CentOS 7 NFS partition doesn't mount on boot

I have a CentOS 7 x64 server which doesn't mount NFS entries in /etc/fstab on boot. The configuration is correct, because if I run mount -a, everything works like a charm. The fstab entries are as ...
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2answers
18 views

Host multiple CMSs at the same domain.

Currently I have a VPS hosting ownCloud. I have added a domain name to the server, so now it is (an example) example.com instead of an IP. I was wondering if (and how) I could add another CMS at the ...
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2answers
56 views

wget shows 404 not found while the page is live

This looks simple but I don't know how to fix. Open the following URL in your browser: https://ecomm.sella.it/gestpay/gestpayws/WSCryptDecrypt.asmx?WSDL This seems working and this will download ...
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0answers
29 views

Optimizing Performance for a Reverse Proxy Apache Server Hosted on a Virtual Machine

I am relatively new to web hosting, and I'd like to learn how to go about optimizing a server setup. Let me start off by describing my setup. I have an apache server, which sits on a vmware virtual ...
0
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3answers
46 views

Does Azure support using Linux as the OS instead of Windows for PaaS Web Apps?

I'm trying to figure out through the interface as well as via the documentation and blog articles if Azure has a PaaS option that runs on top of Linux instead of Windows.
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33 views

Samba Locking excel files

I am having a problem with excel going to read only mode. It is kind of a strange problem though. It will ask if the user wants to go into read only mode and if they close out of the file and reopen ...
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0answers
42 views

Pipe ssh's output (stderr and stdout) to different commands [migrated]

I'm a writing script for some kind of backup involving ssh and rsync. Every time that script runs I redirect all output to a log file. To standardize the log-entries I wrote a log-function that adds a ...
1
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1answer
63 views

Install Node 0.12.x binaries on Centos 7

As of this post, there don't appear to be any yum or rpm options for available for installing NodeJS 0.12.x. Even Node's semi-official yum repo (nodesource.com) is still on 0.10.x for RHEL distros. ...
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1answer
20 views

Linux security implications for sudo, su to service account & add secondary group to admin Tomcat?

I have a named account to login to a Linux host. Tomcat is running under a Service Account named "tomcat" I periodically need to do admin functions like modify tomcat-users.xml which is configured ...
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0answers
16 views

Apache Reverse Proxy loop

I'm using Apache as a Reverse Proxy to more than 10 internal sites.to access the site I have setup pairs of IP addresses with hostnames in the /etc/hosts file of the Reverse Proxy. If I access the ...
1
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1answer
42 views

Winbind not enumerating users and groups of trusted domain

I'm using Samba 4.1.6-Ubuntu in Ubuntu 14.04, for authenticating users from two domains with a one-way cross-forest trust between them. Samba machine is joined to DOMAINA, while DOMAINB is the trusted ...
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0answers
48 views

Squid blocks automatic updates - antivirus and java

I have Squid3 configured as a transparent proxy on a linux server. I am trying to allow automatic updates of windows (currently disabled), java and antivirus programs to pass through. The automatic ...
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votes
0answers
7 views

delayed tcp fast retransmission

I operate some HLS servers based on Redhat Linux. I have a big problems. In streaming from HLS server to Client(smartphone), there are occurred some packet dropped. And then, Server received a lot of ...
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0answers
18 views

SNMP (Windows and Linux) update intervall

I'm writing an application in c# using snmpsharpnet to read information like cpu load, processes cpu and memory usage and so on. I notice that the values that the snmp bulk return are always the same ...
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0answers
12 views

Can't remove lvm after creating snapshot

I have script to backup logical volume. It create *_snapchot of img, then dd, zipped and load to another server. After that script remove lvm volume by lvremove -f. But now i have problem, snapshot in ...
2
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0answers
127 views

Leap second addition in linux - how to make sure kernel detects it correctly

For the upcoming leap second addition on June 30 I have been working on making sure the Red Hat Linux detects the time smoothly. I have installed the updated tzdata and ntpd package on all RHEL5 and ...
0
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1answer
8 views

Unable to start JOnAs service

I'm having problems with my Debian 6.0.3 (Squeeze) server We run an application that uses JOnAs service usually when its not working I run /etc/init.d/jonas start When I do it at the moment I get ...
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2answers
31 views

Which EPEL release do I need?

I have a 64 bit server machine with: Oracle Linux Server release 6.5 Red Hat Enterprise Linux Server release 6.5 (Santiago) and I need to install EPEL repository. I've already tried few of them: ...
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1answer
30 views

rkhunter: “Suspicious Shared Memory segments”

I have here a new installed server with CentOS7 and a GroupOffice installation on it. After installing rkhunter and starting a rkhunter check I get: [09:58:15] Suspicious Shared Memory segments ...
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3answers
83 views

how to check how much memory take process

As all know in Linux machines we have RAM memory and swap memory. My first question is: What the reason that the swap memory is increasing – because high level of RAM usage or something else? ...
4
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1answer
67 views

Can't execute files in particular directories

We are encountering a bizarre issue were non-root users are unable to execute any files (scripts or binaries) in certain directories. This transcript demonstrates the issue: [root@b6 /]# mkdir q ...
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1answer
9 views

Listing all logical volumes in LVM2 that are snapshots

I have a logical volume that has snapshots where the lv name has the date in it. I'm trying to locate that snapshot using lvs and i'm getting close but can't figure out how to list logical volumes ...
1
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1answer
27 views

Can't change source IP address (to floating ip) for udp outgoing packages

I'm having trouble getting a cluster to work using pacemaker and corosync. Here is my hardware configuration: Network: 192.168.3.0/255.255.255.0 Gateway: 192.168.3.1 node1 (Ubuntu Server 12.04 x64) ...