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

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Moving from a Lenny Debian server to a newer machine [on hold]

Hi I am looking for a "To do List" to migrate my old Debian Lenny version VPS to a newer system either a newer Debian (which I believe will go out of service next year anyway) - or another type of ...
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0answers
6 views

Redhat Linux 6.1 x64 bit path problems

I have got 4 paths to a IBM DS3524 SAN. HBA ports with qlogic drivers. Suddenly I got this errors in the /var/log/messages file: kernel: sd 8:0:0:176: [sdsy] Result: hostbyte=DID_ERROR driverbyte=...
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0answers
8 views

Haproxy performance degradation when backends added [on hold]

We are testing performance of haproxy. It's installed on a physical machine with 40 cores and 256 RAM. OS is Centos 7. During that we noticed a weird thing - the more backend nodes we add, the worse ...
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0answers
14 views

How to monitor a Multiple Server if its down or had crash [duplicate]

I really need some help guys. I am just a junior web developer. My senior, which who maintains the server, I think. just quit since he got scolded for not monitoring that the server crashed. Now my ...
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1answer
171 views

What time zone is a cron job using?

I'm guessing there's a difference between my PHP time and the server time. When I check the current time in PHP, it's showing that MST is being used. However, cron jobs aren't running at the correct ...
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0answers
7 views

Why is the cachedir option of createrepo not being used?

I'm trying to speed up execution of the createrepo. The man page suggests adding ---cachedir so I did that. However after running the command the specified directory is still empty. This makes me ...
15
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8answers
31k views

Command line program to test DHCP service

Is there a simple ping-like command to test whether a DHCP service is running on a network? ...on Linux
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1answer
13 views

How can extended file permissions (ACLs) be managed by Kerberos in Linux?

Is it possible to have extended file permissions (ACLs) in Linux be managed (enforced?) by adding permissions authenticated by Kerberos?
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2answers
159 views

Red hat Linux + TIME ZONE CONFIGURATION + details from clock file

In order to configure the Time Zone on red hat Linux machine ( version 5 and 6 ) need to configure the file: /etc/sysconfig/clock And create a symbolic link between /etc/localtime to /usr/share/...
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0answers
22 views

Server starts DDoSing out of nowhere [duplicate]

I've started renting a VPS and have been using it a few weeks back. I am however, not very familiar with managing it. I just checked my e-mail and found that my VPS has started DDoSing. The company ...
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2answers
31 views

Linux - Logging process list during high memory usage

I'm trying to diagnose occasional spikes in memory usage on a Linux server. If the spikes are high enough the OOM Killer kicks in, which results in /var/log/messages containing a useful dump of the ...
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1answer
2k views

snort complains on local.rules

I just installed snort-2.9.7.0 on Fedora 20, and am getting error when running: % snort -c /etc/snort/snort.conf --dump-dynamic-rules=/tmp Running in Rule Dump mode --== Initializing Snort ==...
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1answer
5k views

VisualSVN for Linux

I'm looking for an application like VisualSVN in order to manage repositories and also User Access. For example you can create users and assign them to specific projects. It doesn't matter which ...
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1answer
46 views

Chef Server opscode-reporting with wrong Postgresql credentials

I'm using Chef 12.5.0 and I recently discoverd that after an update the reporting isn't working anymore. So I executed: opscode-reporting-ctl reconfigure and got the following error: FATAL: ...
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1answer
34 views

Overwriting /etc/ Files between two servers

I'm the process of migrating an NIS server from one machine running Ubuntu 9.10 to a new one running Ubuntu 14.04.4 Server, and following these instructions: How do I replace an NIS master server? ...
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0answers
19 views

Installing a mail server suporting multiple domains on linux using postfix + dovecot [on hold]

I am trying to create a mail server on linux (ubuntu). I have seen some tutorial but most of them does not work, or they "partly" work. I've been trying to use postfix with dovecot. Basically what i ...
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2answers
1k views

KVM virt-clone while the VM is running

Is it possible to clone a running kvm machine without tools like virt-clone? They already have the original vm in production, I cannot shut it down. If I don't care about temporary data corruption (...
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1answer
2k views

Access denied trying to login to Ubuntu 14.04 (Authentication with Active Directory)

I'm trying to set up my Ubuntu 14.04 print server to authenticate users with my Active Directory server, I've followed all of the steps using the following tutorial: http://www.kiloroot.com/add-...
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1answer
3k views

Tomcat fails to start, no logs or error provided

I have a Centos5 box running tomcat5 (a version before 5.5, there's no bin/version.sh script). When attempting to start tomcat, whether through init.d or service, I get the FAILED message with no ...
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2answers
4k views

Varnish “FetchError no backend connection” error

Varnishlog: 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829925 1.0 12 SessionOpen c 79.124.74.11 3063 :80 12 SessionClose c EOF 12 StatSess c 79.124.74.11 3063 ...
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0answers
11 views

Linux Ubuntu 16.04.1 UFS: Warnings in Dmsg and Console. ZFS

Why am I getting these warnings on my ZFS disks? ALl disks but sda are ZFS I'm guessing its nothing to worry about though. OS: Ubuntu 16.04.1 LTS, no external PPAs or repos Whole DMesg Warning ...
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0answers
17 views

Looking for a GUI for HTPASSWD, or a way to style the popup [on hold]

At the moment I am just using htpasswd authentication for my clients login to my dev server... I would really like to be able to style a landing page that has the htpasswd login functionality albeit ...
1
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1answer
3k views

“show_signal_msg: N callbacks suppressed” then pegged at 100% and machine unresponsive

This happened on an Ubuntu 14.04 64-bit DigitalOcean Droplet: Apr 22 02:17:02 localhost CRON[32514]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Apr 22 03:16:59 localhost ...
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1answer
1k views

What cause high CPU usage on the server during file upload

When I try to upload a huge file size (approx 2GB), the server cpu usage goes really high. What should I do to fix this? I just use standard html form and php, for file upload. I'm sorry if I post ...
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0answers
20 views

Network-Wide Process Communication/Coordination

I am looking for a way to connect processes on multiple systems in potentially multiple locations. An event bus or message queue seems the ideal way to do this, but I have not been able to find an ...
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1answer
2k views

can not install glibc-devel 'Requires: libnss_files.so.2' error

I'm using Linux 6.1 I need to install glibc-devel but it fails with this error. [root@server1 Packages]# yum install glibc-devel-2.12-1.25.el6.i686.rpm Loaded plugins: refresh-packagekit Setting up ...
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1answer
4k views

LDAP+SAMBA login issues

I'm on a clean Ubuntu 13.10 install and I've just installed and configured openldap+samba. While I'm trying to configure a domain controller plus user shares. In order to ease LDAP management I've ...
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4answers
331 views

Linux no space left on device issue

We have SUSE Linux OS: $ uname -a Linux 3.0.13-0.27-default #1 SMP Wed Feb 15 13:33:49 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Only for a specific file the file creation fails with error no space ...
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1answer
24 views

Access shared files between two vlans using a local server

I am very new to networking. I have two VLANs, and want to read and transfer shared files between them. I cannot add a new router. I have access to a server which can be accessed by both the VLANs ...
3
votes
1answer
1k views

Large lag on mysql replication (Relay_Log_Pos and Exec_Master_Log_Pos does not increase)

Today my two slave's (one mysql 5.1 and second MariaDB 5.5, master is mysql 5.1) started lagging. Similar situation are quite often with lags rises to even 10000 seconds, because slaves have worse ...
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0answers
43 views

Higher TCP latencies in the latest versions of Linux

In my research group, we recently upgraded the OS on our machines from Red Hat 6.2 to Debian 8.3 and observed that the TCP round trip time through the integrated Intel 1G NICs between our machines had ...
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2answers
1k views

Traceroute doesn't reach gateway

I have problem with my openSUSE 11.3 network. So, I've assigned IP address 192.168.137.2 to it, and another computer (Windows 7) with IP address 192.168.137.1. On the openSUSE, the gateway is the 192....
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2answers
3k views

Permissions to Ping over an interface

My server is running CentOS 6. I have a Sprint Broadband device connected as ppp0. This connection has a tendency to need restarted, so I'm trying to monitor it with Nagios (this is used for other ...
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6answers
5k views

SSH doesn't ask for password, gives “permission denied” immediately

Trying to SSH using a user account; root account works but I am specifying a private key. User account simply gives "Permission denied (publickey,gssapi-with-mic) without prompting me for my password ...
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0answers
12 views

fio results of performance measurements (esxi+RAID10) better under Windows than Linux

Summing up On same hardware: fio, Debian 8 on bare metal: read : bw=11973KB/s, iops=1485, clat 99.00th=[ 758] fio, Windows 2008 R2 in ESXi 5.5u2 VM: read : bw=43277KB/s, iops=5398, clat 99.00th=[ ...
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0answers
8 views

Where is PPPoE session id Stored in linux?

How can I get Session ID of my current PPPoE session I have tried Wireshark but I did get Session ID but is there any other method like file in linux ?
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1answer
16 views

Linux: How to build a single command with parameters depending on current time range

I want to create a command which appends a specific parameter only when the current time is between midnight and 6am. Example pseudo-code: mvn clean verify <#if isBetweenMidnightAnd6AM> -...
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0answers
12 views

Is it possible to control the size lastlog pre allocates?

This question is in relation to the lastlog file size explained in this article http://www.noah.org/wiki/Lastlog_is_gigantic I understand it is being created as a sparse file hence the size. Here's ...
6
votes
2answers
4k views

Encoding to base32 from the shell

I'm looking to encode an input string to base32 encoding directly from the shell. I'm looking to do this in ubuntu, but I imagine flavor doesn't particularly matter here. Are there any existing ...
0
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1answer
21 views

ftp reverse proxy using haproxy

is it possible to have ftp reverse proxy like http example client >> proxy >> real server i have tried using haproxy but at the end the real ip of the ftp server is exposed not ...
12
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1answer
4k views

kworker consuming +90% IO and zero disk write

this is a standard apache web server on AWS Linux AMI + EBS. We are noticing high load average (+8) and iotop -a shows: Total DISK READ: 0.00 B/s | Total DISK WRITE: 2.37 M/s TID PRIO USER ...
2
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0answers
17 views

Pre-labelled LTO-6/LTFS tape numbers- Are the tape numbers stored somewhere on the tape?

I have some Fujifilm LTO-6 tapes which come labelled with tape numbers. I'm writing a script and I would like to assign a variable from the tape number. Is this information stored anywhere on the tape?...
1
vote
4answers
7k views

SSH Tunnel yielding “administratively prohibited: open failed” after a few hours

i have a dynamic OpenSSH tunel running as : ssh -N -D *:1080 user@example.com (OpenSSH_5.3p1 Debian-3, OpenSSL 0.9.8n 24 Mar 2010) which runs perfectly for a few hours, of few days, but begin to ...
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3answers
21k views

Linux DHCP server option 43 vendor-encapsulated-options, how to format/encode?

I admin the network for a small business which has an IPCop firewall box providing DHCP services to the network (and various other services). The DHCP server in IPCop appears to be dhcpd and IPCop ...
17
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5answers
18k views

How to automatically run a script when the contents of a directory changes in Linux?

I want to automatically run a script whenever new files are copied into a particular directory. In other words, is there a way in Linux to "watch" a directory for changes and then run something in ...
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1answer
48 views

SSH and sudo over a pseudo-tty terminal

I am trying to overcome some limitations in our environment to write up an authorized SSH file for passwordless ssh keys. I am requiring to perform an ssh as a to a target system, and then run a "...
0
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0answers
6 views

How to update OpenVZ server completely [on hold]

I am trying to update my OpenVZ server from older version to newer version. I would like to know the explained procedure in updating OpenVZ server including the commands performed.
1
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5answers
3k views

nginx: php-fastcgi running but php files not executing

I have recently set up a nginx server with PHP running as FastCGI process. The server is running with HTML files however PHP files are downloading instead of displaying and PHP code is not processed. ...
0
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2answers
18 views

Auto test framework for server deployment

I deploy Linux servers all the time and would like to test each installation. Like a system test. For applications there a numerous of test frameworks, but I can't find anything for testing the a ...
0
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1answer
6k views

NOQUEUE: SYSERR(root): opendaemonsocket: daemon MTA-v4: cannot bind: Address already in use

I have an issue with sendmail on my server (ubuntu 12.10) with php, mysql,and wordpress installed. Basically I want to create a contact form in my blog to receive emails from visitors directly into my ...