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

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2
votes
1answer
34 views

Can't allow users to log in via SSH (Bash, OpenSSH, CentOS 6.5)

I am running a CentOS 6.5 machine remotely via SSH. I use RSA keys and have disabled PAM. The problem that I am having is that whenever I add a new user and want him/her to log in via SSH, they are ...
0
votes
2answers
390 views

Xen: can't get Dom0 and the DomUs to ping eachother

We have installed a Xen (4.1) configuration and can't get Dom0 and the DomUs to communicate (ping eachother). The DomUs are able to ping eachother but not Dom0, and Dom0 cannot ping the DomUs. We ...
0
votes
0answers
8 views

execute local command using ProxyCommand ssh

I am trying to execute local command using ssh and ProxyCommand in sys config but getting an error cat ssh_config Host ameyj-c Hostname x ProxyCommand bash -s "/home/abc/abc.sh" ssh ameyj-c ...
0
votes
1answer
747 views

Gre Tunnel Cisco Linux traffic forwarding

I setup a gre tunnel a cisco router and a Linux machine, the tunnel interface in the Linux box named pic. Well i have to forward traffic coming from cisco through the Linux box. the rules i've set in ...
1
vote
1answer
43 views

Access NMEA reference clock and GPS position simultaneously

I noticed two approaches to get an accurate time from GPS (with PPS). Using ntpd either with NMEA reference clock or Shared Memory Driver My problem: I want to have a very accurate time and access ...
0
votes
1answer
18 views

zabbix & configuration apache proxy header with headers

I wanted to implement checking a page that is available for the two data centers. However, web scenarios zabbixie 2.2.1 does not properly handle headers. I got the idea that it will use for the apache ...
1
vote
0answers
19 views

CentOS 6.4 - Trying to lose link, but can't

I am trying to test out active/active LACP bonding between CentOS 6.4 and Arista. One of the tests I'm doing is to shut down an interface on the host and see what happens. On the switch: Link ...
0
votes
0answers
16 views

Can I update Ubuntu with active users logged in?

I would like to run apt-get dist-upgrade, but I don't know how this will affect the currently logged in users. How can I find out: 1. will a restart be required 2. will the system be ...
0
votes
0answers
10 views

Changing DIR colors in terminal/ssh [on hold]

I am running centos and connecting through SSH with PuTTY, I have read in multiple threads now that changing colors can be done in nano /etc/bashrc nano /etc/DIR_COLORS At default the color is ...
-1
votes
0answers
13 views

Can't change interface duplex and speed on linux

I have eth0 interface with local ip. After reboot, interface have 10 speed and half duplex. After change with ethtool ethtool -s eth0 speed 100 duplex full autoneg off\on link is down, after link ...
-1
votes
0answers
21 views

PostgreSQL server does not start with increased shared_memory

I've installed a new PostgreSQL server on an empty Ubuntu 14.04 virutal server. The PostgreSQL server works fine in default configuration, so i thought it would be a good idea to improve performance ...
-3
votes
0answers
52 views

Deliver All Emails Sent To A Server No Matter The Domain To A Single User

I am working on a solution that requires an email server that deliver all emails no matter what domain it's sent to (preferably without changing configuration with each new domain) to a single user ...
0
votes
1answer
41 views

How to trace dropped TCP connections?

Trying to help someone with a situation where TCP connections get mysteriously dropped after a few minutes for no apparent reason (this happens even with non idle connections). Both client and server ...
1
vote
0answers
5 views

rsync --iconv option on Mac not working (sync from remote Linux server to local Mac)

I want to use rsync to backup data from a remote Linux server to my local Mac. And I want to initialise this operation on my local Mac. All works fine except that there is a special character problem: ...
12
votes
11answers
6k views

Best way to go about changing a root password on 3000+ Solaris, AIX, and Linux servers?

Long story short: Big old corporation, lots of UNIX/Linux servers. I inherited responsibility for a bunch of scripts that that left a few years ago. One of them was a script that would be run every ...
19
votes
7answers
4k views

Poodle: Is disabling SSL V3 on server really a solution?

I've been reading all day about the Poodle vulnerability and it I am bit confused now vs Security and Revenue. If I disable SSL V3 on Server (SSL V2 and V3 both will be disabled for Apache) clients ...
-1
votes
0answers
7 views

is possible to set a default user to be shown at startup LightDM? [migrated]

Is possible to set a default user to be shown at startup LightDM?
1
vote
2answers
301 views

Linux command line based spam checker?

Does a command line based spam checker exist? We have created a mailbox at a 3rd party, and unfortunately decided on spam checking 'disabled' in the initial setup. There is no way to re-enable spam ...
0
votes
1answer
2k views

vsftpd: refusing to run with writable root inside chroot

I want to setup a anonymous only ftp server (able to upload files). Here is my config file: listen=YES anonymous_enable=YES anon_root=/var/www/ftp local_enable=YES write_enable=YESr. ...
0
votes
0answers
6 views

Issues with Gluster and how to stress test it

I'm new to gluster and have just installed it on 2 webservres that are about to deliver a lot of video/audio files (about 16000 files, ca. 1TB in total). What is a good way to test my websever ...
0
votes
0answers
19 views

Why in 64 bit machine not able to use whole free memory as disk cache. Facing sudden disk cache drop

I know, process can use disk cache as free memory as required. In my 32 bit machine I can see, disk cache can use all free memory. But in 64 bit machine can't. In 64 bit machine, I have 252GB RAM(free ...
2
votes
2answers
128 views

tail all log files in a directory | exclude zipped files

Im trying to find the right command to tail a bunch of log files whilst excluding the zipped files in a set directory. The log files are being zipped as they become oversized. At the moment Im using: ...
1
vote
0answers
8 views

Unable to Configure Quotas in RHEL6 & CentOS6- quotecheck returns error message

Unable to Configure Quotas in RHEL6 & CentOS6- quotecheck returns error message I've created new partition(/dev/sda6) and mounted it(on /hulk). Edited /etc/fstab file to give quotas on the ...
3
votes
4answers
5k views

MegaCli: Get the /dev/sd* device name for a logical drive

Let's say I know the drive I want is on Adapter 8, Virtual Drive 0, is there a way to get the Linux device name (e.g. /dev/sdt)? I am on RHEL 6.2. -pdlist displays a WWN value for each physical ...
0
votes
3answers
120 views

Can i install Centos from Amazon AMI image or snapshot on local computer

I have the Amazon Ec2 instance with Centos installed. I ahve all the desired plugins / modules etc installed. Now i want to make the exact copy of that in my local computer virtual machine in vmware ...
0
votes
3answers
28 views

understanding resolv.conf nameserver through system calls

I am trying to understand how /etc/resolv.conf /etc/nsswitch.conf exactly works and what is significance of nameserver entry 127.0.1.1 I did strace ping google.com to get to know about the system ...
-1
votes
2answers
31 views

how to get a connection between Windows and Linux without an existing DHCP server

Scenario: In general a ubuntu machine (called server) runs in a network and gets an IP from it. Due to testing, sometimes a windows machine (client) is physical connected to the ubuntu machine ...
1
vote
1answer
783 views

How do I get rsync to listen on two different ports via xinetd?

I have multiple servers that receive files via rsync on different ports. I'd like to merge them into the same physical server and let the clients continue to direct their files to the same port they ...
0
votes
1answer
750 views

OpenVPN-AS not starting

I have been trying to get an OpenVPN Access server running but I am having a lot of trouble. I have a host node running Proxmox and I would like an OpenVZ container to run the server. I have gone ...
-5
votes
0answers
23 views

accidently i deleted var/tmp file in centos server [on hold]

accidently i deleted var/tmp in root directory ,, and i reboot my server,, i cant login to ssh and my site in 500 internal server error, i try to restart service in whm but i cant, got error with ...
0
votes
0answers
3 views

How do I start an application after I ran the installation script? [migrated]

I've been looking around the internet and I can't find a direct answer to this. I've install Komodo IDE by downloading the .tar.gz file (from http://komodoide.com/download/) and using the tar command ...
0
votes
0answers
3 views

SATA controller or disk failing? [migrated]

Recently my laptop IO became deadly slow. I investigated a bit, and according to smartmon tools I have no errors on the disk, tough I'm getting a lot of errors in the syslog: ata2.00: exception Emask ...
2
votes
1answer
1k views

Linux- Permission denied?

I'm installing Neo4j server as a linux service, but when I install it, I get the following message: /sbin/insserv: Permission denied What is this? What should I do? I'm running everything with ...
-2
votes
2answers
19 views

How to remove Postfix queue messages sent to a specific domain

I have a server with multiple domains. How can I clear all Postfix queue messages for a specific domain?
0
votes
2answers
2k views

service httpd restart failure on aws amazon linux ami

Thanks for your help. I recently did the following: Ran sudo yum update on my ec2 instance running the Amazon Linux ami I then added a virtual host to my vhost.conf for a subdomain. While the server ...
4
votes
2answers
780 views

Mounting NFS3 using Kerberos and AD

I've got a Linux server (Centos 5.6) that needs to automount home directories from a Windows (Server 2008) NFS share using Kerberos. The share mounts (with the nobody user and group) if authentication ...
0
votes
0answers
24 views

mfks.ext3/4 on a loopback mounted file — raid1 deadlock? [on hold]

I'm having a problem with creating filesystem on raid1 array. I'm operating on files instead of real drives. That's what I'm doing: creating 2 2GB files with dd attaching them to loop0 and ...
72
votes
8answers
29k views

Heartbleed: how to reliably and portably check the OpenSSL version?

I was looking at a reliable and portable way to check the OpenSSL version on GNU/Linux and other systems, so users can easily discover if they should upgrade their SSL because of the Heartbleed bug. ...
0
votes
1answer
690 views

Postfix SASL+submission relay access denied

I have been at this for a couple of hours, and apparently I am missing something in newer postfix versions. I have the server set up, and it works locally but when I try to send from a remote network ...
0
votes
0answers
13 views

watchdog service is not working because /dev/watchdog does not exist

There is a ITE8783 watchdog chip placed within my machine (OS Ubuntu 14.04.1). The kernel module it87 supports is. This module was not automatically loaded on startup. So I added it87 to /etc/modules. ...
21
votes
3answers
23k views

Why is my rsync so slow?

My Laptop and my workstation are both connected to a Gigabit Switch. Both are running Linux. But when I copy files with rsync, it performs badly. I get about 22 MB/s. Shouldn't I theoretically get ...
6
votes
4answers
3k views

How do I use the locate command within a specified directory?

I am using the locate command on Linux. My current usage of it searches through the entire filesystem. I only want it to search within a specific directory. How can I do this?
-3
votes
1answer
31 views

Linux Logs Intrusion Detection [on hold]

I am doing a research for security monitoring in Linux system, while I am doing some testing on a virtual machine. Currently I am discovering the logging mechanisms and I am trying to simulate a ...
0
votes
1answer
28 views

Diagnose what is causing Linux system load

I understand that system load is kernel usage such as IO or network. If you don't believe you have high load of either of those two items, what would be some recommended steps to track down what is ...
-9
votes
2answers
37 views

is it possible to have Web server and NAS on the same hardware microsever? [on hold]

I have a HP microserver proliant gen 8, and i want to know if there's a way to make this hardware work as NAS with freeNAS ... etc, and in the same time make it work as a web server with Centos Nginx ...
0
votes
1answer
47 views

BIND failing to resolve with 'WARNING: recursion requested but not available'

there are no errors in the logs and query logging won't initialize iptables is fully disabled but the server will respond with "WARNING: recursion requested but not available" because my client ...
1
vote
0answers
463 views

can't get freeswitch to redirect calls back to kamailio

Background Information: I'm trying to follow the tutorial found here: http://kb.asipto.com/freeswitch:kamailio-3.3.x-freeswitch-1.2.x-sbc The basic set up is as follows: Two Polycom phones ...
3
votes
1answer
2k views

Error headers: ap_headers_output_filter() after putting cache header in htaccess file

Receiving error: [debug] mod_headers.c(663): headers: ap_headers_output_filter() after I included this within the htaccess file: # 6 DAYS <FilesMatch ...
37
votes
3answers
20k views

In Linux, what is the difference between “buffers” and “cache” reported by the free command?

This is an old question that I've seen from time to time. My understanding of it is rather limited (having read about the differences a long time ago, but the factoid(s) involved never really stuck). ...
0
votes
0answers
17 views

Linux quota - wrong disk usage

I'm using centos 6 and quota shows wrong disk usage for all users... Something like multiply real disk usage... # quota -v myuser Disk quotas for user myuser (uid 511): Filesystem blocks ...