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

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20 views

linux + increase temporary the /tmp partition for installation

I have linux VM machines with version red-hat 4 I have the following file system df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 950M 163M 739M 19% / /dev/sda1 ...
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2answers
37 views

What's the default order of “for f in directory/*”? [duplicate]

I wanted to know if iterating over files in directory with for f in directory/* will have some default order of processing entries (file name, created date, etc.?), or is it non-deterministic? It ...
0
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0answers
12 views

overlapping subnets - how to give one precedence?

I have Linux devices with a single ethernet interface and two IP adresses. The first (eth0) is statically configured to 10.1.1.146/24. The second (eth0:1) is configured via DHCP and it may happen ...
-4
votes
1answer
51 views

Linux Server Memory: Is this enough?

One of (weblogic)process on my WAS server(redhat linux) is killed at last night. There is no log. so I doubt my system memory. Is the system or process has enough memory? server specification and ...
1
vote
1answer
40 views

Is there a way to limit the “buffer” memory use in Linux?

I'd like to limit a Linux server's assignment of RAM into the disk cache buffer and instead leave it idle. (CentOS 5 if it matters). I know it's ideal to be using every drop of physical RAM available ...
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0answers
15 views

Should I not use my server when its server image is being created?

I have an Ubuntu server on Rackspace and I am currently getting an image created for this server. In the mean time, are there any adverse effects to either the server or the image if I use my server ...
-1
votes
1answer
47 views

port listening in netstat can't telnet

I'm trying to connect to port 8020 on a CentOS vm but I'm getting telnet: connect to address <public_ip>: Connection refused when I run telnet public_ip 8020. When I run netstat -anp | grep 8020 ...
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0answers
20 views

Apache sending out bogus packets to mysql

We have a LAMP server running Ubuntu 12.04 LTS. We noticed that every few seconds Apache is sending out zero-length MySQL packets to a server with the IP address 192.168.0.170. We have no such ...
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0answers
25 views

apache stops running and can only be started with apachectl [on hold]

On my raspberry pi I have apache2 running. It was running fine for several weeks, until it al of a sudden stopped today. I thought a simple restart could bring it back to live, but it doesn't want ...
43
votes
12answers
6k views

Linux: productive sysadmins without root (securing intellectual property)?

Is there any way to make a seasoned Linux syadmin productive without giving him full root access? This question comes from a perspective of protecting intellectual property (IP), which in my case, is ...
1
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0answers
18 views

Issue with Fail2ban and Mikrotik Firewall

OS: CentOS 7.1 At my organization we are currently assessing using Fail2ban with the firewall on our Mikrotik router. I want Fail2ban to communicate any IP flagged as banned to the Mikrotik ...
0
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1answer
42 views

Linux server as router emulating commercial modem [on hold]

When you buy some commercial routers like TP-LINK or Buffalo or many others, you have the chance of connect to a wan network. So if in a commercial router I set the IP Address 192.168.0.2 and ...
0
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1answer
30 views

DRBD - no resources defined

I have some problems getting a drbd cluster running. When I want to start creating my storage, i get the following error: root@raspberrypi-ha1~# drbdadm create-md drbd1 no resources defined But ...
0
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0answers
18 views

C program memory - data structure visualization tools [closed]

I am working on a complex forest data structure having a linked list for child nodes (in each forest node). Cannot use the matrix representation as the graph is huge and requires a lot of memory. Is ...
-2
votes
0answers
31 views

Where is the expected /etc/init.d/mongod in mongo DB 3.2.1?

I have installed mongodb according to this https://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/ service mongod stop/start/status It works fine but I can't figure where is the init ...
0
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0answers
14 views

How to check apache configuration for a site in a shared hosting [closed]

I have a shared hosting (not VPS!) which provides SSH too. I want to see the Apache configuration for my website (something like /etc/apache2/sites-enabled) but that folder does not exist. Is there a ...
0
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0answers
18 views

What is the most straightforward method in linux to replicate data? [closed]

I'm looking into methods by which one might make generic applications on a basic linux server which don't have replication/distribution features themselves, redundant/highly available from the ...
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0answers
19 views

Truly dynamic configuration files [closed]

There is this nice feature in Ansible, which runs a dynamic inventory script Upon detecting the execute permission on the file. Is it possible to create similar solution for other configuration files ...
1
vote
1answer
33 views

unmounted logical volume is “busy”?

I'm trying to shrink an ext4 filesystem on a CentOS 6 server. I did a lazy unmount of the filesystem while I waited for some processes to finish running. They've all finished running but I can't ...
1
vote
1answer
14 views

Do I need to restart SUSE when upgrade glibc?

I plan to upgrade glibc version (HAVE to install by rpm command) on 30 SUSE machines, all the machine are using for running test on Jenkins. Could someone tell me the reboot is needed in this case?
0
votes
1answer
16 views

source nat for return traffic (Hair pinning )

Is there any way to source nat traffic received ? iptables -t nat -A POSTROUTING -o eth18 --src 123.123.123.123/32 --jump SNAT --to-source 66.66.66.66 Return traffic still uses 123.123.123.123 as ...
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0answers
24 views

ipv6 forwarding in linux failing

I have following ipv6 network in my system. X2 & Y2 interfaces belong to Linux and are physical interfaces. X1 & Y1 are external devices. (2000::10)X1<-----------------> X2 ...
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0answers
23 views

port forwarding by iptables failed

I hope to forward from 192.168.1.230:9090 to 192.168.1.231:8080. I execute the following command: iptables -t nat -A PREROUTING -d 192.168.1.230 -p tcp --dport 9090 -j DNAT --to 192.168.1.231:8080 ...
2
votes
2answers
21 views

Disable upload in vsftpd

How can I prevent local users from uploading files in vsftpd? I know I can prevent them from downloading files by setting the string download_enable in vsftpd.conf on "NO", is there an option for ...
1
vote
0answers
14 views

Broadcasting a printer from Cups / Samba

I am currently attempting to broadcast my postscript printer from my debian machine to other (Windows) based machines on the network. I came across this article and this article which explained the ...
0
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3answers
38 views

iptables rules for port 53 not taking effect

My ubuntu 14.04 LTS server is receiving lots of incoming traffic on port 53 from different ip addresses. I am not hosting any DNS service. So I decided to block port 53: iptables -A INPUT -p tcp ...
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0answers
4 views

x server radeon with multiple screens [migrated]

I've a radeon r9 270x with four outputs, two DVI, one HDMI and one DisplayPort output. I'd like to configure the X server such that it has two screens, from a user's point of view it should provide ...
1
vote
0answers
36 views

How can I distinguish between SAN zoning and LUN assignment issues on RHEL6?

From Red Hat Enterprise Linux 6 how can I tell the difference between a SAN zoning problem (e.g. cannot reach the storage at all) versus a LUN masking issue (e.g. LUNs not assigned to the right HBA ...
0
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0answers
38 views

PHP Glob does not show symlinks on external drives

I have run into a problem using glob function. I use it to scan the entire directory contents and everything is shown except for the symlinks that are mapped from an external hdd or the other ...
-1
votes
0answers
23 views

share internet in linux over LAN [closed]

Kindly let me know whether below scenario will work.. Linux machine A - 192.168.0.1 gets internet from proxy server by setting proxy like 10.22.89.1 : 8080 in /etc/profile. Linux machine B - ...
0
votes
1answer
19 views

rsyslog server listen only on tcp 514

I'm trying to set rsyslog client- server to listen to tcp messages with port other then 514, however it doesn't work. Only when using 514 it receives messages. I'm using EC2 vms. input(type="imtcp" ...
3
votes
0answers
26 views

How does Grub Stage1, exactly, access/load stage 2? [migrated]

This is my first ever question, I have put this question in front of Red Hat Instructors but didn't find any satisfying answers. I'm using RHEL/CENTOS6, GRUB Legacy 0.97, and have consulted heaps of ...
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2answers
34 views

Handle two IPs on the same network [closed]

I have a few embedded low-quality systems (IP cameras) which have an hardcoded IP address that I cannot change. All devices have the same IP, so in theory I cannot put them on the same Ethernet ...
0
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0answers
19 views

OVO agent for Linux + how to find the core id on the agent

I want to print the core id of the Linux agent ( OVO installed on my Linux machine ) I searched in google and find the following commands /opt/OV/bin/ovdeploy -cmd "ovcoreid" -node linux01 ...
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votes
0answers
20 views

Linux Qualification for Junior Developer [closed]

I am junior developer working in Ruby, Python and JS day to day but am trying to build my skill set and get some qualifications on my CV. I am doing this for several reasons, I want to work overseas ...
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0answers
14 views

Server doesn't boot after installing X Window System

I've been trying to install XFCE to use with VNC on a Centos 7 server but every time I install X Window System the server doesn't boot. Always with the dracut error: /dev/md1 does not exists Boot ...
1
vote
1answer
35 views

NTP using GPS and PPS as clock, PPS is marked as falseticker

I am attempting to add a GPS-based clock source to my network, using a GPS which emits a 1-PPS clock pulse. This is connected to a GPIO pin. After allowing ntpd to run for 30 minutes or so, the PPS ...
0
votes
0answers
16 views

Xen VGA passthrough w/ XEN_PCIDEV_BACKEND kernel option

Xen's webpage ( http://wiki.xenproject.org/wiki/Xen_VGA_Passthrough ) says this is a requirement for VGA passtrough: "dom0 Linux kernel needs "XEN_PCIDEV_BACKEND" option enabled." I'm running ...
0
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0answers
22 views

Getting more info with PAM auth

I'm trying to setup a SOCKS authentication using PAM. I'm using a custom python file as a pam module to authenticate users but the problem is that I can't seem to pass all the informations needed to ...
3
votes
1answer
55 views

How to automate RAID configuration, BIOS configs during PXE installs

Ok, since this got put on hold, trying to reword it to fit the format better. Business problem: As part of our automated install process of baremetal machines, we need to do some basic pre-work on ...
0
votes
1answer
24 views

What can I check to see why a server is inaccessible

I have a server that is running an older version of Centos (5). About once a day, for 4-5 minutes, sometimes longer, the server is not accessible. After a few minutes it becomes available again. It is ...
3
votes
0answers
28 views

Can servers with encrypted root filesystems be made reasonably highly available?

I have some servers I'd like to keep on encrypted disks, but I don't want to have to manually type a passphrase at every boot. I also don't want to keep the key on the machine unencrypted. TPM would ...
0
votes
0answers
13 views

Adding an ip6ip6 tunnel in Linux fails silently

This is on Debian Wheezy. I'm trying to add an ip6ip6 tunnel like this: # ip -6 tunnel add v6tunash01 mode ip6ip6 local 2a02:27f0:2:246::2 remote 2a02:27f0:2:306::2 No output. But the device ...
0
votes
0answers
13 views

CLI tool for setting configuration options across projects [closed]

I need to setup multiple servers and for each I have to change some configuration options and add some new options. Is there an easy way to state that a given config file should have certain values ...
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votes
0answers
9 views

Crashing NFSv3 server locks client shares

I have a NFSv3 server running on NetBSD 7. There is a Linux (3.16.0) and an OpenBSD (5.8-stable) box connected to it. When the server crashes the clients are unable to unmount the shares. The shares ...
0
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0answers
22 views

iptables using ipset with SNAT

I have a bunch of iptables SNAT rules that map networks to ougoing public ips, like this: iptables -t nat -A POSTROUTING -o eth0 --src 10.1.1.0/26 --jump SNAT --to-source 123.123.123.12 iptables -t ...
0
votes
1answer
17 views

sudo apt-get install -d zsh. Can not find where it downloaded the file

After running command sudo apt-get install -d zsh I get the following output: Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: ...
-1
votes
0answers
17 views

Ubuntu server /dev/root full and causing some errors on my website [duplicate]

My ubuntu server has around 2Tb storage and i use it to host onlt 1 website. Recently i've been having some errors saying: 'PDOException' with message 'SQLSTATE[HY000]: General error: 3 Error ...
-1
votes
1answer
43 views

Can Linxu RDP client connect to Windows 10? [closed]

Is there a RDP client for Linux that can connect to Windows 10? I have been using rdesktop to connect to my Windows 7 server just fine, but now I am required to connect to Windows 10 and I keep ...
2
votes
0answers
14 views

SELinux: manually changing files in /etc/selinux/targeted/contexts/files/

I'm setting up a CentOS 7 server in which the /home directory has to be located on another partition and then mounted with bind-mount. So: /data/homes should be bind-mounted to /home. The problem is ...