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

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MDADM not showing RAID5?

I own a Blackarmor NAS 440. I set up 4 brand new 3TB Seagate drives in RAID 5. It has been working fine for ~2 years, until this July. HDD3 failed. I requested a replacement under warranty, and ...
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1answer
32 views

mount a root disk in mnt

How can I mount a root virtual disk from another VM on my CentOS ? In order to change some files on it, not to use it as a real root disk. there are 2 partitions on my virtual disk : /boot (Linux ...
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0answers
12 views

RHEL/CentOS - hugepages configuration for Oracle DB

I am going to use hugepages on my RHEL6. I have 6 Oracle db instances on it. SGA are configured and memories parameters setted to 0. I would like to know how to calculate the value to use for ...
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2answers
43 views

How can I access the bios remotely on a desktop computer acting as a server?

What are the options for having remote control via network of a computer even down to the "bios" level. I've seen Dell's DRAC / Out-of-band management that they have for their servers, and typically ...
1
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1answer
11 views

libvirt - Restart VMs after return from power failure?

Is there any way to make KVM automatically restart any VMs that have been shut down due to power failure? Here is my scenario: I run a small VM tank, mostly with development VMs on it. I now have a VM ...
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0answers
12 views

Does Ubuntu with Linux 3.5 having TX RX ring buffers or BQL

My linux uname -a command outputs: Linux Davinci001 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux So, does NICs with this Ubuntu machine is ...
2
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1answer
11 views

Remote end of IPSec transport is 'permenantly glued' to loopback after some messing around with GRE

So, I have managed to get IPSec transport over ESP between two hosts using racoon: the 'local' host, 1.1.1.1, and the remote, 2.2.2.2. It only worked for ICMP (other traffic ignored the SA), but ...
1
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1answer
22 views

How to clone image and data for VM on Azure?

I'm trying to find a way to clone the image of one VM on Azure. I knew some information about 'sysprep' and Linux system, but those require delete the previous VM. In my case, I don't want to delete ...
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3answers
448 views

Enable SSH shell access but disable SFTP access

I've searched for a viable answer to this question, and most of the answers include advice on why to not do it. However, here's the scenario, and what makes it necessary: I have a console app, and in ...
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0answers
22 views

After cpanel install on linux cannot access WHM [on hold]

I am very new to this and need some assistance. I have a dedicated server running centos6.5. I installed cpanel onto the server this morning. First i had issues with the domain name on the server not ...
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1answer
34 views

Determining the old MX record [duplicate]

Our sysadmin created our mailserver years ago before he left. We recently decided to use gmail as our mail app and they required us to change the MX record to point to them on amazon route 53 app. I ...
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1answer
23 views

Moving MySQL files from Mac to Linux

I had a mysql server running on a Mac. Unfortunately, the Mac died. However, I got a backup. I am now trying to restore the server on a Linux machine. I have moved the mysql files located in ...
1
vote
1answer
31 views

SSH from Windows to Jump Server to MySQL [on hold]

We have a MySQL instance running on a Linux machine and had to open a tunnel to access the server. This worked fine until admin decided to add a steppingstone / jump server. Now i can't seem to ...
0
votes
0answers
28 views

Finding and renaming directories by regex in linux

I'm trying to match (and later rename) directory names like: A0000 (SOME-NAME) A0001 (SOME-OTHER-NAME) A0001 (ANOTHER-NAME) I'm testing to see if I match any using the find command but doesn't seem ...
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2answers
40 views

TCP - TAP performance

Linux. Is there a performance loss from using a tap device vs a hardware one like eth0 ? The goal is to create a user space tcp/ip stack and avoid the kernel as much as possible. I would like to be ...
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1answer
44 views

Population of /etc/resolv.conf upon new server installation [on hold]

I purchased two Linux servers that have CentOS preinstalled. One was bare whilst one has many other common packages installed(httpd, bind, mysql, php). I purchased one of these servers with 2 ...
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2answers
31 views

Generate report/histogram of file access counts on Linux [on hold]

I would like to generate a report or histogram of file access counts, for every file accessed while a process is running. ...And not just files accessed by that process, but ideally all ...
9
votes
1answer
59 views

Share /home between datacenters

I have two servers, placed at datacenters in holland and france. Both are running Debian Wheezy. I need to share /home between them, with good performance. There are 300-something users on the ...
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0answers
19 views

Understanding the different IP's setup in my core server files- Confusion [on hold]

I am running CentOS 5 with BIND and httpd, using PuTTy to connect via SSH. I login to SSH with IP 200.100.107.187 and can access my server through a webbrowser also at that IP This IP is the one my ...
1
vote
1answer
20 views

Openvpn failover setup - Routing to clients with static ips

I have a setup with an openvpn server and many clients connected to it. All those clients have fixed ip addresses, derived from their certificate name. Behind the openvpn server, I have a management ...
0
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0answers
12 views

cannot open assembly certmgr.exe

I'm trying to run a basic console app that calls a web services hosted on an external https endpoint using Mono. I keep getting errors about decrypting the response. Some googling has led me to ...
1
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2answers
35 views

Use OpenVPN tun device for specific request

I have setup an OpenVPN connection with the route-nopull configuration. So now no special routes have been added to the client's configuration and only a TUN device is created, like so: tun0 ...
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0answers
22 views

creating a custom service on ubuntu [migrated]

I am setting up an ap called scumblr (https://github.com/Netflix/Scumblr/wiki) The final step calls for initiating the server using the following 3 commands: redis-server & ...
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2answers
40 views

Yum installation fails with RHEL 6.5

I am trying to install shibboleth SP package using YUM installation (Yum install shibboleth). I am getting the following error while installing. Downloading Packages: ...
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1answer
17 views

Setup openvpn as interface device only

I just setup OpenVPN client using this guide on The Geek Stuff But now (somewhat as expected) all my traffic is routed through the VPN. I actually just want to set up the interface device. Does ...
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1answer
23 views

Doesn't NFSv4 have no_root_squash?

When I in /etc/fstab have nas:/tank/nobackup /mnt/nas nfs exec,nosuid,rw,bg,soft 0 0 then mount -a; mount gives nas:/tank/nobackup on /mnt/nas type nfs ...
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0answers
8 views

Rename files in selected folder in Linux [migrated]

Command for rename file as IMG0001 to 4R0001 in folder for f in *;do mv "$f" `echo "$f" | sed 's/IMG/4R/g' `; done AND I just want rename selected folder /tmp/2014/1201 (rename files) ...
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0answers
22 views

log error in centos7 [on hold]

I'm just a beginner in linux base opreation system. I delete a log folder(log folder and all the sub folder within log folder) under var folder because it take 19GB of my hosting. And here we got the ...
9
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2answers
921 views

SSH MOTD per user

I want to display banner (welcome message) for SSH users with a specific welcome message for each user.
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0answers
56 views

Creating zones and editing named.conf - Centos [on hold]

I am running CentOS, with bind(BIND 9.3.6-) installed, and accessing via SSH with PuTTy. My goal is to setup a nameserver for my domain d.org on my dedicated server 44.44.44.44 which also hosts the ...
1
vote
1answer
22 views

ttyS0 acting strangely: how to reset it without rebooting?

I've got a Redhat box whose serial console (dev/ttyS0) is acting strangely. Firstly, it is echoing all input, including passwords typed at the login prompt. Secondly, running stty sane or other stty ...
1
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1answer
34 views

Is Linux limiting my application's UDP transfers, and how can I see it?

I am currently developping two applications to work over a custom video streaming "protocol". Basically: The server captures video frames from a webcam, slices them into parts, and sends these parts ...
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0answers
11 views

Disabling autoenabled hotkeys while in Cinnamon fallback mode (in a RDP session)

I connect via a Windows 7 machine via RDP to the server (running Linux Mint 17); I authenticate, it launches into fallback mode (pretty standard). However, when I type certain letters, like 's', the ...
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0answers
16 views

Avoid unexisting subdomains to show main domain

I have a site example.com, and I made a subdomain test.example.com, both work just fine. The problem is that if someone now surfs to an unexisting subdomain like puppy.example.com he still gets to see ...
3
votes
2answers
25 views

logrotate not emailing log

My logs are being rotated properly, however, I am not being emailed the rotated log. What am I doing wrong? My main logrotate.conf is: include /etc/logrotate.d here is my ...
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0answers
13 views

Vestacp custome nameservers [on hold]

I am using vesta control panel, as per their documentation, i have created custom nameservers, here what i did... I have registered both nameservers using 2 different ips at my domain registrar. I ...
1
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0answers
18 views

The default value for vm.dirty_background_ratio

Wondering why the default value for "vm.dirty_background_ratio" from Linux Server (CentOS and Ubuntu) is set to 40. Is this just a recommendation for safety? Or is there any particular reason why? ...
1
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1answer
28 views

generating ssh-keys for a non root user with salt

I need to generate ssh-keys(public/private pair) for a user say helen. This user is already in all my salt minions. How do I generate ssh keys for this user from my salt master? For root user I ...
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votes
2answers
37 views

How to check HDD in Linux for bad blocks

Since 2 days one mysql server can't start. I get this every 5 secs in the syslog: Dec 17 09:24:35 backup kernel: [ 681.132013] ata2.00: exception Emask 0x0 SAct 0x50000 SErr 0x0 action 0x0 Dec 17 ...
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0answers
30 views

postfix - hock - extracting information out of processed emails

The setup Linux, Debian Wheezy, serves as mail server for about 1000 users. Courier and Postfix installed in this box. Info about the server It is a postfix setup which drops the emails to the ...
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0answers
27 views

FreeRadius Error reading /etc/freeradius/huntgroups

I've configured freeradius to use sql, everything was working fine, I was doing some tests with the users, and suddenly I cannot start the debugger because of this error : rlm_preprocess: Error ...
0
votes
0answers
13 views

unable to open luks encrypted device (wrong password) [migrated]

I'm using CentOS 7 with a luks encrypted root partition. Usually I have to type my password during boot, but sometimes the system doesn't accept it. It reacts as it was wrong, but it isn't. I did not ...
-1
votes
0answers
22 views

Linux editing remotely mounted files [migrated]

I have a web server and I mount the directory containing all my website projects onto a local directory in my Linux VirtualBox under /home/UserA/Desktop/Remote/sites. My problem is editing the files ...
1
vote
1answer
16 views

command line alternative to dpkg-reconfigure slapd

Is there a way to reconfigure slapd, providing all configuration options as command-line parameters/arguments? My goal is to be find an alternative to the interactive UI. Thank you
0
votes
2answers
32 views

Automatic archiving of log files [on hold]

I look at my various log files, and I believe the operating system will periodically archive the log by appending a datestamp to it. I've created some custom logs in my httpd.conf file, however, ...
2
votes
1answer
13 views

Migrate Gitlab Database from v6.3 to v7.5?

What way is the best way to migrate all projects, issues, users, snippets and everything else from an old gitlab installation to a new one? Our old machine is a bitnami VM with GitLab 6.3.0 - The ...
0
votes
1answer
26 views

Centralised log monitoring for linux servers [on hold]

I've read several QA on this site about monitoring servers, but I found out, that none of them centralises all the logs I want to watch. To describe my situation: 10 linux hosts Using logwatch to ...
1
vote
2answers
61 views

Performance Tuning Linux [closed]

Performance Tuning/ Monitoring/Latency keeping in mind I see following 4 items & in each item they are lot of tools. CPU Memory IO Network What I see following tools we do use. vmstat mpstat ...
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0answers
21 views

Fix Linux Log Directory Permission Denied

I just setup a fresh install of Amazon Linux on EC2 and I cannot access the following directory: -bash: cd: /var/log/httpd: Permission denied or -bash: cd: /usr/share/tomcat7/logs: ...
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votes
3answers
56 views

free shows more memory used than top process total

UPDATE: This was being caused due to a known issue with nss-softkn. See this article: https://www.splyt.com/blog/2014-05-16-optimizing-aws-nss-softoken When I run free -m from my centos 6.5 box I ...