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

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1answer
23 views

Shutting down Openstack server and virtual machines

When I shutdown Openstack compute host (for example reboot required by updates) what happens to virtual machines that were running on that host? I know that when host starts again the virtual ...
0
votes
1answer
19 views

Unblock All Ports in CSF? [closed]

I have CSF installed on a cPanel server and know that I believe that I can unblock ports specifically for outgoing connections in the /etc/csf/csf.conf file. It looks like this line can just be ...
2
votes
1answer
31 views

Traffic shaping outbound clients source ip with tc / iptables

My question is I am trying to limit a users bandwidth on a server and wondering the best way to do this. Before I dive to far into the tc/iptables I was wondering if I could get any advice on this ...
-6
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0answers
29 views

How to do Virtual Locations with VPN [closed]

How dose hide my ass do Virtual Locations with VPN ? https://support.hidemyass.com/hc/en-us/articles/202722036-What-are-virtual-locations-and-what-do-I-need-them-for-
-2
votes
1answer
33 views

How to open sftp connection and execute sftp command in the same shell command [closed]

Is there any possibility for opening sftp connection to remote server and execute sftp command in same line from shell. Something like this: sftp user@example.com && put /tmp/test.txt /tmp/ ...
4
votes
1answer
86 views

Practical ulimits

One of the projects I'm working on is moving certain puppet-applied ulimit settings away from "that sounds about right" to dynamically allocated based on the environment. This is for ...
0
votes
1answer
26 views

What is the counter type for Linux's /sys/block/$DEVICE/stat

What are the counter types for /sys/block/$DEVICE/stat? $ cat /sys/block/sda/stat 8323741 42381356 464031898 19207478 1940738 49062039 408122282 79935459 0 22315734 99172579 Specifically, ...
-1
votes
2answers
42 views

Debian 7 password recovery [closed]

During installation, I've set up a password which I have typed wrong twice, and now I'm not allowed to gain access to my root account in Debian. I'm trying to procedure like ...
1
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0answers
21 views

Copying from NFS mount crashes Linux client machine

I have NFS share mounted on CLIENT in /etc/fstab: SERVER:/share on /mnt/share type nfs (rw,users,noexec,nosuid,nodev,timeo=14,hard,intr,addr=1.2.3.4) Intensive use on client like copying a lot of ...
0
votes
2answers
62 views

Issue with multiple virtual hosts on dedicated server. 2nd VH won't respond, 1st one does

I've got two virtual hosts setup and enabled using a2ensite. It's Ubuntu Server 14.04.1 LTS, Apache2, etc. So there's two config files in /etc/apache2/sites-available and their respective symlinks ...
-1
votes
1answer
46 views

Bonding multiple proxy server [closed]

I want to use multiple proxy server at the same time to speed my downloads. How can use multiple proxy at the same time. Reverse Proxy products such as haproxy nginx can use multiple proxy server but ...
0
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0answers
51 views

Forwarding traffic from one ethernet interface to another

Earlier, I was trying to get traffic from one ethernet interface to another without using a bridge. Here is a link to the solution : ...
-1
votes
0answers
30 views

Send traffic out the right interface (Linux) [closed]

I have two interfaces (wan and wan2). I want to use wan2 interface to connect to only one port (for example 9999). I do not want to use it to connect to other ports. Connections to the rest I want to ...
2
votes
1answer
155 views

SFTP-server uploaded files having wrong rights

I have been trying to figure out what is wrong with the file rights. When I am uploading files using FileZilla all the files get rights -rw-r--r--. I would want them to have -rwxr-xr-x. I have tried ...
1
vote
1answer
25 views

Amazon EC2 - Not able to find / mount EBS volume partition

I have a linux instance to which a ebs volumne of 20GB has been attached. The web-console volume page shows: 20 GiB gp2 snap-b3a87xyz in-use i-cd5b9999 (myinstance):/dev/sda1 (attached) The ...
-2
votes
2answers
47 views

How to uninstall nginx on CentOS7 [on hold]

I installed Nginx from src myself using this guide and now, I would like to get rid of it. But it seems there is nothing to do, aside from wiping out the src in usr/local/src I did yum list installed ...
4
votes
2answers
171 views

What happens to a daemon without a “K” link in /etc/rcX.d/

What happens to processes started by init through an init script, if that script does not have a corresponding K entry in (for example) /etc/rc0.d/? For example, the following script started a ...
1
vote
2answers
51 views

How to override the hostname that DHCP configures on a CentOS7 box in AWS? [duplicate]

The title nearly says it all. I have a VM in EC2 running CentOS 7. It uses DHCP, which seems to be a EC2 requirement. DHCP keeps overwriting the hostname on reboot, no matter what I try. I won't ...
-1
votes
0answers
11 views

How can I use tacacs+ server for AAA by my application

I am trying to centralize the AAA mechanism for for one of my application. So I was thinking of using tacacs+ server for that purpose. But I am not able to find a proper way to use it. I am trying to ...
0
votes
0answers
16 views

mdadm/grub2/lvm boot failure if all drives are physically connected

Weird problem here. I've got a Debian 7 server (quad core, 32GB RAM) that runs a whole bunch of VMs. The main boot drive is a RAID 1, with an LVM volume group called System, which contains a bunch of ...
0
votes
1answer
30 views

why linux bridge shows 2 mac addresses for one qemu vm?

I am new to qemu networking and pretty confused about the following situation. I launched 5 VMs. Each connects to br0 through a tap device. I also have a dnsmasq listening on br0 for DHCP. The ...
0
votes
1answer
27 views

New Relic memory reporting

We're using New Relic to monitor a server and a PHP application. New Relic is reporting memory usage of 90%+, which aligns with top. However, the sum of memory used by the processes in New Relic ...
1
vote
1answer
31 views

Apache - random file takes a long time to load

The issue can be seen here: Random files on some page loads just take forever in the "receiving" stage, no matter what the size of the file is. Sometimes it takes extra 500 ms or up to 20 seconds. ...
0
votes
1answer
16 views

redhat 5.8 uses cifs protocol version 1 or 2?

I have one redhat 5.8 server and i would like to know if the server uses the cifs protocol versiorn 1 or 2. I was looking trough /sys and /proc, but i didn't found nothing, my question is, how can i ...
0
votes
1answer
50 views

Measure Dedicated Server Performance

I run an online video streaming site and keep getting more and more dedicated servers. Our business traffic fluctuates on an annual cycle which allows us to scale back our dedicated servers during the ...
0
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0answers
5 views

Dreaded Failed to create the VirtualBox object error [migrated]

My VirtualBox has gone loco. It crashed so badly, the entire machine (Ubuntu Linux host) crashed and required a reboot. Upon reboot, everything except for VirtualBox appears to run fine. Attempting to ...
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votes
0answers
9 views

Winbind without smbd

We authenticate the users on our Ubuntu using pam_winbind. After having spent some time with the update from Samba 3 to Samba 4 I'm wondering if it is possible to use winbind without the rest of the ...
0
votes
1answer
17 views

Amazon EC2 server cannot connect and access via putty out of sudden

I have a ubuntu server setup in amazon ec2 for few months. Today, out of sudden, the server status is not reacheable and putty is not accessible too. I've also rebooted the system, it seems to be ...
1
vote
2answers
64 views

Is my Postfix sending spam?

In my Rsys log I am getting weird email requests that are not initiated by my server: Nov 17 09:32:18 localhost postfix/qmgr[21748]: 8E52272C09: from=<>, size=33770, nrcpt=1 (queue active) Nov ...
1
vote
2answers
97 views

Missing packages after clean Debian install

I've just installed a clean version of Debian (Wheezy) using the netInstall image. I feel like there's a lot of missing package (that are usually installed by default when I used to use the full ...
4
votes
1answer
193 views

What is the size of an IO Operation (IOP) in AWS EBS?

My research suggests that both the standard and the maximum (kernel limitations) block size for modern file systems (ext4, xfs) is 4KB. However, AWS allows IO operations as large as 256KB and says ...
0
votes
1answer
58 views

Run app only in swap [closed]

I've a very low priority level program who consume large of memory. I need to free RAM for other programs. My objective is to kill -STOP <pid> this process and ```kill -CONT when i need it. But ...
0
votes
2answers
38 views

Can NFS server limit the amount of disk space that the NFS client can use?

Let's say in a server A with 100GB partition, user create a NFS export directory. In server B, user mount the NFS share to use it. In server A, can the NFS server limit the amount of disk space that ...
0
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0answers
83 views

VMs on ESXi system, only able to use internal IPs

first off I am a bit of a network newb, I know the basics but that is about it. So I have a ESXi server running a few VMs. The set up is; -Master IP (controls the ESXi box) -Internet IP (for general ...
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0answers
5 views

Packet forwarding for guest VMs not working [migrated]

I'm am running some VMWare Fusion VMs on OS X, and I'm having trouble with networking. OS X has a Wifi interface with two IP addresses: en0: ...
2
votes
2answers
65 views

bc: using “scale” with bash variable [closed]

Easily, I'm writing a script that needs some values with 2 digits after floating point. Trying to use bc I don't understand how use "scale", i.e. A=12 ; bc <<< $(($A/5)) it's correct, but ...
1
vote
1answer
56 views

Wordpress and Apache 2.4 installation troubles: Cannot Serve Directory

I'm having a devil of a time getting Wordpress going on my webhost. When I try to access my virtualhost, I get a "403 Forbidden You don't have permission to access / on this server." error and a ...
1
vote
1answer
39 views

Does password aging affect locked accounts in Linux?

I have a requirement to change the maxdays setting of several Linux accounts to 365 and most of the accounts are locked. Does password aging settings affect these accounts? My concern is that I'll ...
0
votes
0answers
18 views

PHP Change log Centos 7 [duplicate]

Might be a silly question but Im looking at the change log for PHP by running this command - rpm -q --changelog php | grep CVE See all the CVE's listed does that mean they have been patched in the ...
-1
votes
2answers
46 views

Can't update to latest PHP version. Centos 7 [closed]

I'm unable to update to the latest PHP package. I ran yum update php and it updated to PHP 5.4.16. Reran the update command to see if there was any newer versions and stated there was no packages ...
1
vote
0answers
32 views

LightDM fails to load after upgrade [closed]

I'm running Debian testing (Jessie) and XFCE4 is my desktop environment. I recently did an apt-get upgrade. Now, when I boot, I get a blank screen with a blinking cursor. Nothing happens, but I'm able ...
0
votes
2answers
119 views

Apache virtual host not working on Ubuntu 14.04 LTS

I've been using this tutorial to set up an Apache virtual host on my Ubuntu pc. I've created a no-ip domain which I will be using as the hostname of my virtual host. I've followed every step of the ...
0
votes
0answers
35 views

how do I recover /bin/hostname [migrated]

I have accidently deleted /bin/hostname. Termporarily I have put in a shell script there that returns the known name. But how do I recover the lost binary? It is an AWS AMI. Linux ip-10-2-0-162 ...
1
vote
1answer
22 views

Azure VM crashed and I recovered the VHD however cloud-init prevents me from booting it locally

One of our VM's suddenly was stuck at 100% CPU load and was unable to be reached from SSH. Rebooting did not help, nor did creating a new VM from the existing VHD. I downloaded the VHD. However, I'm ...
-2
votes
1answer
20 views

Create symlink if source exists

I'm trying to make a symlink to a directory if it exists only and cannot figure out how. I tried various ideas I found and none worked. Most notable idea that i thought would do the job was to use ln ...
0
votes
2answers
118 views

Forensics on tons of file changes

It has come to my attention that my CentOS 5.6 5.11 VPS has over 16,000 files with a timestamp during a 3-day period in September this year. I can't figure out why that is, as I did not log in via SSH ...
0
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0answers
26 views

Debugging frozen Gnu screen session?

We've been using GNU screen on our jump box to have ssh sessions open to multiple hosts within our private network. One window per host. Recently we've built a new environment and are experiencing ...
0
votes
1answer
27 views

Most outgoing connections blocked (kind of?)

I have a server which I upgraded from Ubuntu 12.04 to 14.04. Now I have some extremely strange behaviour (which I believe was not present immediately after the upgrade, but can't be sure): I can't (by ...
0
votes
0answers
9 views

Put crossdomain.xml into icecast2 webroot

I'm trying to put a crossdomain.xml file inside icecast2 web root to be able to access by the flash player http://example.com:8000/crossdomain.xml I'm frustrated now. Tried everything possible but ...
0
votes
1answer
42 views

OEL 6.5 bonding mode=802.3ad no connection

OEL 6.5 bonding mode=802.3ad no connection I configured 2nic into bond on OEL 6.5. to cisco switch (lacp) ---------- | eth0 |=====+ +~~physical-link~~\ ---------- || --------- | ...