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

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Encrypting a headless Debian home server

I have a server on which I'd like to install Debian and use as personal network storage. The problem is that I'd want the server to be as encrypted as possible, since I'm going to be living with ...
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4 views

Unable to mount root fs over NFS [migrated]

I am attempting to set up the first (of many) Raspberry Pis running Pidora to boot from an NFS share. It is my goal to eventually place a dozen or more Raspberry Pis in the datacenter I use to power ...
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5 views

IPv6 host route is deleted after PMTU expires

I am experimenting my new IPv6 tunnel setup between my local Ubuntu box and a scratch Linode. I set up some docker containers, configured 6in4 tunnel server and IPv6 forwarding on the Linode: # uname ...
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11 views

rebuild yum index on aws s3

I am trying to rebuild yum repo on aws S3 after adding new packages. Here are few commands I am trying, but it is not helping. [root@chucks ~]$ createrepo --baseurl ...
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21 views

clonehd takes 2 hours for a 100GB disk. Expected?

I have a VirtualBox image using VDI and flexible size. Right now the physical DVI file 94GB. The host is an Ubuntu server and the guest is a CentOS 6.4 with ext4 partition. The host is using a sata ...
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4 views

Is there a way to get current txqueue utilization on e.g. eth0 or tun device?

I have detected drops on my tun0 interface. They seem to have been caused by low txqueuelen setting. Now as I increased the txqueuelen value for the network device and there are no more drops yet - ...
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7 views

JVM process resident set size “equals” max heap size, not current heap size

After a few reading about jvm memory (here, here, here, others I forgot...), I am expecting the resident set size of my java process to be roughly equal to the current heap space capacity. That's not ...
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16 views

Two identical VPS hosts with different ways of handling file names

I have CentOS 6.5 32 bit, 512 RAM, running Nginx, PHP-FPM, Mysql on two hosts. One for local dev, running inside a VirtualBox 4.3.12 and the other running online with digital ocean. Both of these ...
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1answer
16 views

Netcat UDP File Transfer Between Two Servers Times Out?

I'm testing file transfer speeds between two Red Hat servers that are connected to the same switch within the data center and I decided to use netcat to eliminate protocol overhead as much as ...
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2answers
18 views

multiple tailf commands?

How to use multiple tailf command in linux? Have tried so many but unfortunately nothing worked. [admin.ar@IRISCORE home]$ cd iris [admin.ar@IRISCORE iris]$ cd logs [admin.ar@IRISCORE logs]$ tailf ...
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12 views

sg_map & lsscsi showing old storage version

I am using SUN storage and recently upgraded/refreshed my ISCSI LUN storage. We have replicated old storage to new storage and attached to our servers. I can see at SUN storage side that storage is ...
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1answer
43 views

Linux server hangs, where to look for possible reason?

Linux server hangs for several times without knowing the exact reason. Which file or log should I look at? The server responds to ping, but I can not ssh to it. And when I plug a monitor into it, it ...
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2answers
30 views

HP Proliant Standby

I'm working on coordinating a rack with 1 HP Proliant DL580 G5 and 2 Proliant DL380 G4's. Is it possible to induce either of these units into something like a standby mode? I've perused the manuals ...
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20 views

iptable CLUSTERIP won't work

We have some requirements which explained here. We tried to satisfy them without any success as described. Here is the brief information: Here are requirements: High Availability Load Balancing ...
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1answer
30 views

Web Interface to sharing files on a server with automatic deletion after x days [on hold]

I currently have access to an FTP server, with files uploaded onto them. I was interested in knowing how to: Automatically delete files on a specific folder on the FTP server which are x days old? ...
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2answers
37 views

RHEL 6.5 and LDAP

I am trying to connect our Active directory server to brand new RHEL 6.5 server. I want to authenticate users using AD credentials, but I want to restrict that only certain users can login, I don't ...
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28 views

LVM mirror attempt results in “Insufficient free space”

Attempting to add a disk to mirror an LVM volume on CentOS 7 always fails with "Insufficient free space: 1 extents needed, but only 0 available". Having searched for a solution, I have tried ...
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20 views

periodic connection timeouts to nginx server

We have the following setup: One nginx server as a loadbalancer in front of four worker application servers. The nginx server get about 100 requests per second, sometimes more that that, active ...
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15 views

Multimaster Keepalived Configuration (Virtual IP with Load Balancing)

Here are requirements: 1. High Availability 2. Load Balancing First configuration 1. Two linux servers have been configured with one static IP for each: 10.17.243.11, 10.17.243.12 2. Keepalived has ...
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1answer
10 views

NetExtender: Unable to reconnect

I am running NetExtender on my Linux based server to connect to the another company's private network. The connection works fine but once in a month, if the connection drops it does not reconnect ...
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1answer
20 views

unable to configure vsftpd using ssl

i am trying to setup vsftpd over ssl . followings are configuration under vsftpd.conf anonymous_enable=NO local_enable=YES write_enable=YES local_umask=022 #anon_upload_enable=YES ...
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1answer
31 views

Disabling ZFS cache ZFSonLinux

Using ZFS to take advantage of some of the available options and to manage volumes, not the RAID. I have a single logical device (HW RAID) added to a zpool. The ZFS ARC does not seem to perform as ...
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2answers
25 views

FTP and SFTP logs track in CentOS

How it is possible to track the changes made to a directory using tools like FileZilla or XFTP ? because we found some files suddenly got missed from server, in history also nothing was found so ...
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1answer
65 views

What is the correct iptables rule when NATing multiple private subnets?

I have a Centos minimal 6.5 acting as a router. eth0 is connected to a Cisco switch trunk port, allowing VLANs 200-213. I have several VLAN interfaces just as this link suggests: ...
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1answer
37 views

tc-qfq is classless error

I'm using Linux 3.0.101 with iproute2-3.4.0 on a router and I'm getting this error: tc qdisc add dev eth2.2 root handle 1: qfq --> OK tc class add dev eth2.2 parent 1: classid 1:10 qfq weight 1 ...
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1answer
36 views

What is the difference between sar -B verses sar -W

I am trying to understand why my system is running slowly. I found the sar command, but wanted to know the difference between sar -B and sar -W I read the man page, and I understand that -B gives me ...
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0answers
36 views

File server instance in Amazon AWS [on hold]

I have a VPC in Amazon Web Services with an instance that works as a file server, i.e., I want other instances (clients) to copy files from an to this instance. All the instances are Ubuntu servers. ...
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0answers
26 views

How to add an SSH user to my Ubuntu 12 server to upload PHP files

I have an Ubuntu 12 VPS and wanted to create a user account to upload and download my PHP code. So when logged in as root I created a user "chris" and then created a directory /var/www/chris I want ...
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3answers
71 views

Automatically Kill/Restart Process(es) When Memory is Critically Low

I have a Debian Wheezy VPS box where am running a couple of Django apps in production. Ideally, would have tried addressed my current memory footprint issues by optimizing the apps, adding more RAM or ...
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2answers
57 views

understanding my site's DNS records [on hold]

firstly apologies for using the word 'pointage' this is the word my french domain registrar uses so I may have used to wrong term. OK I would like to better understand what is going on on my ...
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1answer
18 views

Installing PHP 5.2.17 from WHM/Cpanel server by replacing 5.4.31

Recently we purchased a dedicated server with WHM/Cpanel. The PHP version installed on the server is 5.4.31. But i want to downgrade the pHP version from 5.4.31 to PHP 5.2.17 as to run some old ...
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1answer
41 views

Server load increases by lot of httpd request with same PID [on hold]

I can see that my server load increases to more than 200-300 range. Before 1 week the maximum load was around 20-25. In top and ps -ef i can see a lot of httpd threads and the PPID of most of the ...
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6 views

vmstat uninterruptable sleep calculation vs. wa

How is uninterruptable sleep calculated? Is the 'b' figure a reasonable figure to estimate the number of processes waiting for I/O over the course of that second? For a synthetic test : i=1; while ...
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16 views

Permission Issue for mounted Folder

We are using Jboss5.1.0 installed in Oracle Linux Server. We have mounted the Virtual Folder Directroy from Windows 2008 R2 Server which servers images and css files. we have mounted the virual ...
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1answer
18 views

Does linux count s3fs mounts as local disk usage?

I have an s3 bucket mounted on an EC2 instance whose main disk is an EBS volume. Whenever I run something like du -h /path/to/mount it tells me the size of the folders within those. I'm wondering ...
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1answer
29 views

rpm command stucks in my machine

in CentOs 5 rpm command stucks in my linux machine... [root@manage glib]# rpm -i libgcc-4.1.1-52.el5.i386.rpm [root@manage glib]# ps -efww | grep libgcc root 2020 32168 0 13:50 pts/0 ...
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2answers
54 views

script to count the occurence of the particular string in the given time interval

We are trying to write a script "sendemail.sh" to count the number of occurrence of a particular string in a log file "SendEmail.log" within the given interval. We have a log file. In that we are ...
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1answer
50 views
+50

Configure firewalld for OpenVPN (server-bridge) in Fedora 20

I've installed an OpenVPN server (server-bridge) on Fedora 20, but I cannot get it to work. I'm almost sure that It's a firewall issue. I'm trying to connect from an OSX client, but I can connect ...
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9 views

Multiple file systems on BeagleBone Black? [migrated]

I'm trying to put together a BeagleBone Black using Debian on the EMMC, a separate MicroSD card and a flash USB disk (but could ostensibly be platter media on USB). My question, simply put: are there ...
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1answer
21 views

Running 64-bit apache mesos on 32 bit non-Linux non-Mac OS operating system

I am exploring Apache Mesos for my next project. As I was going through the mesos documentation, I realised that it can be installed on a Linux(64 bit) and Mac (64 bit) machine. That should be fine ...
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13 views

Ganglia and how it communicates

I'm a little confused about how Ganglia sends information around and have found conflicting information on the web. I would have thought that the gmond process would either send info to gmetad at a ...
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1answer
20 views

fail2ban block ports rules iptable

I just installed Ubuntu Server 14.04 and don't have much experience with IPtables. I am trying to get a basic setup going where I only accept SSH connections on port 22 and 2222. I actually have that ...
1
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1answer
11 views

Tomcat SFL4j error

I am getting this error when trying to start a new application using Tomcat: Could not find necessary SLF4j logging jars. If using Jetty, the SLF4j logging jars need to go in the jetty lib/ext ...
0
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1answer
20 views

Siege - running a stress test benchmark

I need to do a benchmark test of a HTTPS server using Siege, to see how it behaves under massive load. I'm initiating tests from another machine which is quite powerful and it is connected to the same ...
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2answers
28 views

TFTP PUT Failing Across Hosts

I have a TFTP server installed on a CentOS host. /etc/xinetd.d/tftp: service tftp { disable = no socket_type = dgram protocol = udp wait ...
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2answers
90 views

Website down but server is fine

Apologies if this is a vague/if I've missed any information. One of my biggest websites are down and it's causing lots of problems. The server which it is hosted on is absolutely fine (all the other ...
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1answer
15 views

MDADM remove drive during recovery

I would like to know that can I remove a drive during a recovery process from a RAID1 array: What happend is that SDD had bad sectors, I removed it with mdadm --manage /dev/md0 --fail /dev/sdd1 ...
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2answers
44 views

CentOS 6 - Kernel 3 from CentOS 7 Repo?

i want to run kernel 3 on centos 6. I found out, that it cant get installed over yum and i would need to compile it by my own. My question: Could i use the centos 7 repo to install kernel 3.x from ...
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1answer
35 views

server using too much cpu with nginx and gzip enabled

I have magento website on dedicated server. I decided to use gzip to save ban-with for magento websites and wanted to load them faster. But now server is using %250 more cpu if I click on a category ...
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2answers
56 views

SSH Public Key Authentication only works if active session exists before

I have a rather strange problem with my SSH configuration. I set up my server with the help of a Remote Access Card and configured everything with a KVM viewer. So while being logged into the server ...