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

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Linux Mint Kernel Upgrade made network card undetected

I had decided to manually install(by creating .dpkg file) the new kernel 3.16 on my Linux Mint. For this, I have created .config using "make x86_64_defconfig" and have not gone for any customization. ...
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0answers
11 views

VNC Issue on CentOS 7

[root@localhost ~]# systemctl start vncserver@:1.service Job for vncserver@:1.service failed. See 'systemctl status vncserver@:1.service' and 'journalctl -xn' for details. [root@localhost ~]# ...
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0answers
14 views

What iptables modules are installed?

What is the command to show what modules are installed for iptables? I stumbled upon it once, but now I can't seem to find it no matter what I google for. I want to use iptables to implement quotas ...
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15 views

How can I get the CPU usage for a given process out of collectd?

I'm running multiple ubuntu (precise) boxes & I've got collectd pushing data up to a central logstash box, which is then sending it to carbon (graphite). I'm running the processes plugin for ...
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1answer
21 views

sed, replace in linux http://cdn1 with https://cdn1

I want to replace http://cdn1.domain.com with https://cdn1.domain.com in 200 .html files and I dont know how to do that with sed. Can somebody help me with this?
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1answer
30 views

IP addresses - special lookup to gain more ownership information [on hold]

I was trying to see who an IP address belonged to that was showing up a lot in apache logs, so I checked ARIN and that gave me the ISP information. Since that wasn't specific enough, I used ...
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0answers
28 views

Create partition from free space [on hold]

I have a home server which installed CentOS. 40GB Sata and 80GB IDE connected to it. I partition 17GB for / and 23GB(free space) for RAID0 with IDE. Here is my disks. So, I want create partition from ...
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0answers
3 views

WSO2EMM (MDM) Profile Installation Failed - Certificate is invalid

I followed the documentation (https://docs.wso2.com/display/EMM110/General+Server+Configurations) to generate the certificate and depoly the iOS agent but when I try to setup the certificate I have ...
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1answer
38 views

has no MX record

I have two servers running CentOS release 6.5 (Final). In one of them is installed FreeIPA: Name: freeipa.fi.example.com IP: 192.168.99.50 And the other Zimbra as mail server: Name: ...
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2answers
52 views

Installing multiple OSes at once via PXE

I want to set up a network installation using PXE to install multiple OSes. I found this guide that does something similar: https://help.ubuntu.com/community/PXEInstallMultiDistro But what I'd like ...
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0answers
43 views

Why does every user have his own group? [migrated]

One thing I've noticed in a lot of recent distros is that users all have their own groups with the same name as their user name. What's the purpose of that? Groups are made to group users together in ...
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1answer
11 views

Supervisor program not found

I create a test here: vi /etc/supervisor/conf.d/test.conf It looks like this: [program:sentry-test] command= echo "hello there" I then run the command with the output: supervisorctl reread ...
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0answers
7 views

remove duplicate files with script and lftp

we copied some files from ftp to local linux server , now we need to check local files (i.e by size) and if there was same as ftp files , then delete ftp files. we need some scripts to run in cron ...
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0answers
10 views

Restoring WHM accounts from server files

Is it possible to restore WHM after a server failure, with just the original files? The usual way to restore is through their back-up facility but I don't have that. I have the /home folder. Many ...
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0answers
12 views

Customs Firmware, Proxy or Something else for Captive Portals? [on hold]

Ok, so first of all, hello to everyone, I will explain what I need to achieve... In my company we offer cheap internet connections, so we deal with modems usually, right now we want to evolve the ...
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2answers
80 views

How to clone a linux live server with no stopping it?

This is my current situation:+ A linux server containing several web applications that cannot be stopped, with no physical access to it, only via ssh. This is what I need: I need to replicate it to a ...
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1answer
14 views

AXFR query to BIND9 stops

When trying to use dig to do an AXFR transfer of a zone it always stops at a particular record and then a server time-out error is thrown. The bind log doesn't show anything related to this and I'm ...
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0answers
12 views

Virtual Ubuntu Trusty Server in Hyper-V Server 2012 ocassionly shuts down

I am running a virtual Ubuntu 14.04 Server as a Hyper-V virtual machine. Sometimes after a day or two the virtual machine just stops and shows as off in Hyper-V. Every other VM just runs fine. In the ...
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3answers
161 views

Determine the OS version of an OEL linux box?

The usual methods to determine the OS versions seem to be viewing /etc/*-release file *here would be the family to which the particular version of the OS belongs to. But on the OEL system, the ...
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0answers
44 views

VM with 2 network cards

I have a VM with 2 network interfaces which is running CentOS. One connects to a private network (192.168.6.x) and another to our company wide network. When I try to ssh the private address from a ...
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2answers
34 views

Bash Script keeps respawning after it should die

#!/bin/bash PID=$(pidof daemon) kill $PID while ps -e | grep "[d]aemon" >> /dev/null; do sleep 30 done sh -c /root/daemon This script is set on a cronjob to kill and restart this program. It ...
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0answers
19 views

HA router with keepalived showing unexpected traceroute

I have a couple of routers in HA using keepalived vrrp daemon under linux. Here are the addresses x.x.x.129 floating (keepalive) x.x.x.130 router1 (static) x.x.x.131 router2 (static) Something ...
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0answers
19 views

Port forwarding lxc

I am trying to configure ssh for an LXC container with iptables port forwarding. But it is not working. The following is the result of iptables-save. *mangle :PREROUTING ACCEPT [10428:3784706] :INPUT ...
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0answers
36 views

Ubuntu server hangs and blocks out entire network

This is a very strange situation with a very general and open question asked at the end. we have a Ubuntu 12.04 server that has ran without problem for about year and a half. No fancy hardware. Just ...
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0answers
14 views

My apache and vnc config suddenly don't work anymore (debian/mint)

Last night it worked, but this morning, all of a sudden apache2 is not working anymore, the config files seem to be overwritten, I get the following error: [FAIL] Restarting web server: apache2 ...
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0answers
15 views

Create bootable Windows USB on CentOS 6.5 [on hold]

Any tool that works to create: Bootable Windows 7 USB Bootable Windows 8 USB on CentOS 6.5? Thanks!
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1answer
37 views

Deny acces to all Internet hosts except several [on hold]

I'm using Ubuntu 14.04, I want to restrict access to Internet to all programs and processes. I also want to allow several hosts after that. I was trying to do that with iptables, but I could figure ...
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0answers
7 views

squid3 wccp2 setting up gre tunnel from squid proxy to router

I am trying to setup a gre tunnel between a squid 3.1 proxy on linux debian, and a cisco router. I want to have web requests to port 80 to pass through the proxy first. I have created a gre tunnel ...
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0answers
22 views

Sharing virtualmachines between windows and linux hosts. What filesystem do I need? [migrated]

In my current setup I'm using both Windows and Linux hosts, I've a bunch of VM in a partition and I need to use and access them from either hosts. I've tested a couple of filesystems with very poor ...
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votes
1answer
37 views

Find RAID controller under Linux

I have been trying to find the RAID controller for good purpose. I need to find the right driver that works with the RAID controller. I can assure you i have a raid system in my server, here is an ...
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1answer
45 views

Routing traffic through different interfaces based on incoming IP

I am trying to setup a unique setup where I have to route traffic that's incoming to one server and have the traffic based on the incoming IP address get routed through to different interfaces and ...
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0answers
23 views

How can I configure myhostname to work with postfix and Ubuntu 14.04 on Azure VM

My hostname file reads as this. virtual-machine-set hostname -f virtual-machine-set /etc/hosts reads like this 127.0.0.1 localhost 191.xxx.xx.xx myazuredomain.cloudapp.net #The following ...
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0answers
18 views

TCP port numbers for Linux ptys? [on hold]

Do devices like /dev/pts/0 and /dev/pts/1 have TCP port numbers? I'd like to talk to another terminal (via telnet or rsh, say) using (hostname, TCP port number) as coordinates.
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0answers
17 views

XL2TPD multi LNS and individual selection by LAC

I am currently looking how xl2tpd selects the name of the "session" to start pppd. In fact I wish to establish, for example, two LNS. I'm on my own local network, the scheme is as follows, and I'm ...
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votes
1answer
36 views

private network with single IP multiple servers

I am trying to set up a subnet in our company. We got several (10+) Linux servers for computing but we can only get 1 static IP (company policy, 10.x.x.x address). So the idea is to place a routing ...
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0answers
15 views

mdadm reattached a failed drive all by itself

I have 2 drives setup in mdadm mirroring (3 partitions on each drive). Last week the second drive (sdb) dropped out of the array because of some I/O errors I am still investigating. After a server ...
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votes
1answer
38 views

Can I configure IO error proof Linux on virtualized environment?

I believe everyone who are working on virtualized environment like Xen has experienced some sort of IO problems which lead to read only mode for guest machine. We experience same issue couple of times ...
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1answer
52 views

Installing Windows over Linux on a Hetzner server

I have a remote dedicated server from Hetzner which you can usually only install Linux on, because I haven't paid the ridiculous 25 euros/month for Windows. However, they have KVM access and you can ...
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0answers
66 views

File is different when read from NFS server

So I have a backup server we've been using for some time, it's a FreeBSD server running zfs and serving it over NFS. The export is simple: /backup/vm -maproot=root -alldirs. If relevant, that was ...
3
votes
1answer
102 views

`ls` causes Segmentation Fault on a specific directory

I used $HOME/.local as prefix to install some applications without root access. There is one directory inside $HOME/.local that I can't execute ls command: [tuananh@server lib]$ ls Segmentation fault ...
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0answers
16 views

TCPv6: Possible SYN flooding on port … . Dropping request - how to change limit?

TCPv6: Possible SYN flooding on port ... . Dropping request My server is dropping legit connections. It is not a publicly reachable server and it supposed to handle a LOT of ipv6 connection from my ...
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0answers
5 views

Sporadic packet loss through RT-N65U router with cable Internet [migrated]

My setup looks like this: TM902S (EuroDOCSIS 3.0 cable modem) <-> RT-N65U router <-> several computers in LAN The router is running this firmware with a custom traffic shaping script. The ...
3
votes
1answer
102 views

HDD is acting up, but S.M.A.R.T says everything is fine

Before I begin, a quick disclaimer. I'm basically a developer forced into a sysadmin role by circumstances, so I apologize in advance if I say something stupid or seem like I don't know what I'm ...
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1answer
35 views

Site to site ssh tunnel

I have two virtual environment at different locations, and I want to set up site to site ssh tunnel for contact between those networks. I have configured the ssh tunnel on both sides with routes to ...
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1answer
28 views

auto remount read only filesystem

We have an Ubuntu Server 12.04 LTS running on Xen. I believe we had a disk problem and Ubuntu switched to read only mode for partition "/". However the disk problem was just for a second and other ...
4
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1answer
63 views

Linux as router - How can I determine which route to use (depends on different source addresses)

I have a Linux server and I used it as a router, which has two network interfaces. I use eth0(10.76.8.60/24, 10.76.8.50/24, router: 10.76.8.1) to connect to the network, and eth1(192.168.1.1/24) ...
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0answers
59 views

Client successfully connects to OpenVPN server but with no internet access over the VPN

I'm trying to setup OpenVPN with static key authentication(instead of TLS) on TCP port 443; but the client cannot access the internet over the VPN after connecting to the server. Here's my current ...
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0answers
21 views

why did pam_tty_audit stop working?

I recently installed the following updates to my system: Upgrade: libpam-runtime:amd64 (1.1.8-3, 1.1.8-3.1), libpam0g:amd64 (1.1.8-3, 1.1.8-3.1), libpam-modules:amd64 (1.1.8-3, 1.1.8-3.1), ...
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0answers
26 views

Removing Mdadm raid system and boot with a single disk

I have a linux system running a RAID 1 (MDADM) system. For virtualisation purpose, i need to remove this system of RAID and then boot again the machine with just the main hard disk. Now.. I am not ...
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2answers
111 views
+50

How to keep the time on multiple servers in sync

I want a cluster of servers to have the exact same time. All are using UTC time zone. Using NTP currently, i still see they seem to be off by 10-20 miliseconds each. Whats the best way to have them ...