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

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How to install perf utility on red hat 5.10

Is the there a way to install perf on red hat linux 5.10 ? I tried the normal way but it failed sudo yum install perf Loaded plugins: aliases, changelog, downloadonly, fastestmirror, filter-...
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58 views

Out of memory: The process “mysqld” was terminated because the system is low on memory

I got this email alert today, with the following information: Process Name mysqld Event Time Tuesday, June 14, 2016 at 11:09:42 PM UTC PID 1820 Process UID 498 Process Username mysql ...
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12 views

X11 Forwarding using Attachmate Reflection

I've been using Putty for my SSH connections. I've been able to use XMing and X11 forwarding without a problem. I have to switch to Attachmate Reflection for work. I connect to the same machine and ...
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15 views

libnss-ldapd and Onelogin vLDAP

I'm trying to get Onelogin's new vLDAP service working with libnss-ldapd on an Ubuntu server (14.04). It looks like vLDAP uses authenticated bind per user. I've tried lots of different configurations ...
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1answer
42 views

Unable to communicate with pacemaker host while authorising

I'm trying to configure pacemaker cluster with two hosts, I'm using two centos 7(CentOS Linux release 7.2.1511 (Core)) virtual machines. What I did so far: I installed packages: yum install ...
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1answer
16 views

SGE/OGS 2011 breaking Ansys Workbench Mechanical launch due to network port blocked

We are running a SGE / OGS compute cluster on EL6 and are trying to launch an interactive Ansys Workbench. This works using SSH with X Forwarding, but using qrsh fails to run the Mechanical component -...
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15 views

How can I launch graph500 benchmark on nVidia GPU with CUDA?

How can I launch graph500 benchmark on nVidia GPU with CUDA? There is written: https://devblogs.nvidia.com/parallelforall/gpus-graph-predictive-analytics/ At the IEEE Bigdata conference later in ...
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3answers
95 views

Passwordless root SSH on CentOS 6 with public key

I am trying to create a "passwordless" setup so that the remote server is more secure without password + I can automate the login process. I have created a new ssh key with ssh-keygen, and copied the ...
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31 views

Openldap configuration on RHEL 6.6 client

We have a shell script which runs perl program to connect to LDAP server and make entries. This is the only script which uses ldap. This server is hosting all batch related files and run batch jobs ...
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1answer
28 views

Unable to install specific version of apache2

I pretty new to this, My distro is Ubuntu 14.04, I have installed apache2 latest version, which is available in repositories,(i.e.,2.4.7-1ubuntu4.9). I have used this command,apt-get install lamp-...
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79 views

How to allow users on an openLDAP server to create, update, and modify users under a certain organizationalUnit?

I have been stuck on trying to allow openLDAP users that are in a certain group (EX: cn=Admins,dc=mydomain,dc=com) to create, modify, update, and delete users that are in another organizationalUnit (...
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11 views

Applying ppolicy.ldif in OpenLdap

I just added the ppolicy.ldif schema to ldap by running the following: ldapadd -T EXTERNAL -H ldapi:/// -f /etc/openldap/schema/ppolicy.ldif I then try to ldapadd my change.ldif file seen below #...
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0answers
16 views

SVN Repository Management Between Windows and Linux Platforms

We have a developer that manages our SVN repository. They are in charge of deploying changes from their dev server to the live site as. If for example the live site and this developer's dev site is on ...
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1answer
20 views

forwarding emails via postfix, smart routine to actively check that it works

I have a domain registered at namecheap and run my website on a digitalocean droplet. I have successfully set up email forwarding on the server with postfix, such that emails sent to name@example.com ...
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38 views

hostapd Wired 802.1x with Bridge

I've got a PCEngines APU running Debian Jessie. I'm trying to configure hostapd to perform wired 802.1x authentication against a remote domain controller running NPS on 2008 R2. I would like 2 of it'...
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1answer
45 views

Thin LVM reducing the metadata size and performance

I have recently created a Thin LVM. I notice the Data is at 1.60% and Meta at 1.21%. [root@srv ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv1 volgrp1 twi-aotz-- 410....
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8 views

How to set an ACL in OpenLDAP to allow a user to fully manage an OrganizationalUnit? [duplicate]

I just installed OpenLDAP on my Ubuntu Server 16.04 LTS. I have my OpenLDAP server setup as depicted in the image below: Just like the image depicts I would like the blue color coded cn=admin to be ...
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30 views

Custom centos6.7 iso does not boot in uefi

I have created a custom CentOS 6.7 iso and in BIOS it boots and installs my application successfully. When I configured my VMware to boot in UEFI i get this error: -EFI Virtusl disk (0.0)... ...
2
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0answers
14 views

Comparison about security between file layout and object layout of pNFS [duplicate]

In the three types of pNFS (block layout, file layout and object layout), as I know, block layout is lack of security. So, between file layout and object layout of pNFS, which type is more secure?
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13 views

Comparison between performance of block layout, file layout and object layout of pNFS [duplicate]

As I know, there are three type of pNFS: file layout, block layout and object layout. So, between these types, which layout reach the best performance and which layout has the worst performance.
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1answer
20 views

Cacti generate old graph

I have a cacti system (Version 0.8.8b). The cacti system has been running for a year. I would like to generate retroactive daily graphs, because cacti can't show the old daily graphs. How to ...
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1answer
30 views

apt-get upgrade breaks PHP

I have installed PHP 5 from source for various reasons (mostly because readline is broken in the Debian packages, and we use that for tab completion in a CLI backend). When I run apt-get update &&...
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1answer
32 views

Linux: limit outgoing bandwidth based on destination /24 network

I am setting up a scanning system for a Pentest company. The box has loads of bandwidth and I'm concerned that testers could inadvertently DoS the clients. Capping the outgoing bandwidth to 10mbps ...
1
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1answer
61 views

How to write a shell script to search from a position in file instead to start from beginning of the file again

I am trying to write a shell script to find value stored after a repetitive word in a big file with millions of lines using for loop. After the finding the repetitive word how i make script to start ...
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14 views

Google Recaptcha Node.js Not Showing Up

I had a friend add Google reCaptcha to a node.js web site I have and on his machine it shows up when testing the site. When I entered my pub and priv key in the correct places the recaptcha does not ...
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19 views

linux auto.nfs config gets updated periodically

I' have little experience with linux autofs. I can't help but keep noticing that files in /etc/ timestamps change periodically. From documentation, my understanding is fstab is supposedly fixed(...
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32 views

Control internet access in LAN

We have a lab setup with multiple user-systems, where user authentication is done centrally from a server through ldap and home directories exported from server through nfs. Within this lab setup we ...
2
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0answers
25 views

Windows 10 Pro Sharing/Samba Speed Throttling?

Does Windows 10 Pro file sharing (aka Samba) throttle its speed? Mine seems to cap out at exactly 25 megabytes per second. My Windows 10 Pro machine is directly connected (via crossover cable) to a ...
0
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0answers
11 views

Error when use gitlab in context path

I try to configure gitlab CE with my Apache server. I want to have access to gitlab via context path e.g. .com/gitlab . To do that I configure proxy on my apache: ProxyPass /gitlab ...
0
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1answer
26 views

Can't enable cgroups memory controller

I have Debian 8.5 on DigitalOcean with a kernel version 3.16.7-ckt25-2 I'm trying to enable cgroups memory controller for Docker. I add cgroup_enable=memory swapaccount=1 to ...
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2answers
68 views

How to find online support for Amazon Linux AMI

I am a beginner to Linux, but am currently deciding on a distro for my AWS EC2 web server. My question is how to find online support to Amazon Linux AMI should I decide to use it? I know that it is ...
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2answers
46 views

Block SSH hop based on traffic origin?

Is there a way to find where the SSH traffic origins from? We have two servers A and B. A is on a private network. B has 2 nics, private and public. A can SSH into B and B can SSH into A problem is, ...
3
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1answer
48 views

Determine if Linux OS is booting off a USB

I need to determine (with a bash script) if a Linux OS is booting off a USB. Can we grep some command to find out?
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33 views

DNS request has status: SERVFAIL

Can you please take a look at the below config and what I am doing wrong? Just set up Ubuntu 14.04.4 LTS with bind and when I do a dig to my server I get a status: SERVFAIL My configuration is the ...
2
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1answer
31 views

Locking mechanism on pNFS

As I know, in parallel NFS, after getting Layout from Meta Data Server, Client communicate directly with the Data Server. I wander what will happen if multi clients read or write to the same region of ...
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6 views

Lookup process info of POSIX signal source

Good day everyone! I'm trying to find out all process, who sent SIGHUP to daemon, so I run one-row-script strace -qtt -e trace=none -e signal=SIGHUP -p 5670 2>&1 | while read in; do echo "$in"...
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1answer
64 views

linux redhat + how to install only the latest kernel rpm under /boot

installing of errata security kernel rpm ( from redhat sattelite ) on the linux red-hat, could sometimes - create a diff 2-4 new update kernel under /boot , the problem here that /boot could be ...
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2answers
54 views

/dev/sdc1: unable to read superblock

Linux Ubuntu 14.04 (azure server) I was trying to backup /dev/sda1 drive so I executed the sudo dd if=/dev/sda1 of=/dev/sdc1 command. While executing the command is available, the space was ...
2
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1answer
65 views

How NFS lock works in pNFS

As I know, pNFS is an extended protocol over NFSv4.1. Does anyone have any information about how the NFS lock works on Parallel NFS (pNFS)?
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1answer
89 views

Advantages and disadvantages of each type of layout in pNFS

As I know, Parallel NFS (pNFS) has three types: file layout, block layout and object layout. What are the advantages and disadvantages of each type?
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13 views

Jboss AS 7.2.0 Final : Enable SNMP ( standalone )

I have a JBoss AS 7.2.0 Final running in standalone mode. So, following some guides that I've found on internet, there changes were made at my ../jboss-as-7.2.0.Final/bin/standalone.conf JAVA_OPTS="$...
0
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1answer
41 views

How to create a HTTPS Proxy?

I have to setup access to a remote API service in which requests are IP-Whitelisted. The problem I have is that my web-nodes are in the cloud and their IP addresses often change. Therefore I want to ...
0
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0answers
19 views

Multiple Nginx Error Log Locations

I'm trying to get Nginx to log both in a log file and to stderr. The reasoning behind this is that I want Nginx to log to a log file as well as to journald. From the research and tests I've done I ...
1
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1answer
18 views

How to create a symmetrical Host - VM setup

So I'm in a rather annoying situation where about half of the work I do requires a Linux based environment to work on, and the other half requires a Windows based environment. Unfortunately I need to ...
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0answers
60 views

CentOS mail bounced error dsn=5.1.0 status postfix issue

I'm running centOs on my server and i use postfix for sending emails but a while ago postfix has started bouncing every mail i try to send giving this error: Jun 9 12:06:49 IrideLamp1 postfix/pickup[...
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27 views

Using a rented VPS as an Openvpn server for friends: legal risks and how to avoid them?

Disclaimer: I have done some research on the legal implications of an Openvpn server hosted on a VPS, but have come back from these quite empty-handed. Context: We are a bunch of friends in ...
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2answers
104 views

Linux change source ip adress of incoming traffic

I have a web service running on port X. It was never intended to run outside a local network, but I would like to access it over the internet. Therefore, I need to change the source IP address of all ...
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1answer
21 views

How to choose AWS EC2 instance with highest bandwidth for downloads?

I am about to create a new Ubuntu Server EC2 instance. However, there appears to be very little information regarding the bandwidth available for each instance type. The server will be primarily used ...
0
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1answer
19 views

Danger of setting the environment variable 'PATH' with a '.'? [closed]

I have an upcoming test and looking at past years they always ask a similar question. Basically the security hole that would be created by setting something like: PATH=".:/bin:/usr/bin" I get that ...
1
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1answer
31 views

IPv6 and LXC connectivity

I am struggling a bit on how to equip my LXC configuration with IPv6 currently. What's the setup? Ubuntu 16.04 LTS LXC2-beta from the Ubuntu PPA's (feature IPv6 connectivity) I use a netcup IPv6 ...