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

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7 views

EFI ignoring isolinux.cfg?

i have a modified centos 6.5 iso with isolinux.cfg which is modified to use kicstart file from iso, it's working on server with BIOS firmware. When tried on EFI systems it shows grub-prompt and ...
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0answers
15 views

How to have WordPress read a text file that has a link as it's only text and use that link in a page? The link changes regularly [on hold]

The subject describes the matter, I think. Using an API, I'm provided a link that changes often, that I need to serve in my WordPress blog. I can easily cron a wget to get me the file. The question is ...
1
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2answers
12 views

shared object file open error with “sudo command” but NOT with “sudo bash” then same command?

I'm having a hard time getting my brain wrapped around how LD_LIBRARY_PATH is handled differently for the following three cases: run as a regular user run via "sudo command" run via "sudo bash" ...
-1
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0answers
27 views

Which distribution has the largest security update coverage [on hold]

Most large distributions provide timely security updates to newly discovered vulnerabilities. However, most distributions also limit these security updates to a subset of the packages in the ...
0
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0answers
14 views

SFTP, limit download data for specific user

I was wondering if a root user can create another user with a specified limit of data to download from server (i.e.: from Filezilla). Server is Debian 7
1
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0answers
29 views

Multiple pearl processess all hitting one IP address DDOS source hack? [duplicate]

I have been running at high CPU loads 45 45 45 ish for a while, updated cpanel / apache so far but tracing PID's that are running I find the following all with the same IP.. [code] select(8, [3], ...
3
votes
3answers
135 views

rsync many small files with long filenames takes a lot of bandwidth

I have a file storage server which stores files on disk using the file's sha256 hash as the filename, along with the file extension, and in three levels of directories, e.g. a PDF file with sha256 ...
-2
votes
0answers
12 views

Fedora 8 on intel atom device using live image burn with unetboot [migrated]

I'm new in LINUX, and I've been installing fedora 8 live image on intel atom based cpu ( installed on the harddrive, not usbstick) I have a running internet connection (router, Windows based PC, and ...
3
votes
2answers
36 views

After a while ssh connection freezes when a command run remotely produces a lot of output

The situation is this: there is a an ssh client (Ubuntu 14.04) and an ssh server (Debian 7). There is a bunch of networking in between them. SSH connection is easily (and quickly) established and ...
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votes
1answer
12 views

Port 5005 on my VPS is listening, but closed

I have a program running on port 5005, and the port is listening and accessible via localhost: znc-admin:~/.znc$ netstat -tulpn | grep 5005 (Not all processes could be identified, non-owned process ...
-1
votes
1answer
25 views

Best Practice for Mailbox Backup (IMAP)? With Webinterface?

Situation: Debian Mailserver with ISPconfig3, Postfix and Dovecot, about 500 Users with different Domains. Server is a virtual client, so i backup it via XenBackup. Problem: If a user delete a single ...
1
vote
1answer
22 views

inetd and echo service

inetd - From Wikipedia, inetd (internet service daemon) is a super-server daemon on many Unix systems that provides Internet services. For each configured service, it listens for requests from ...
-2
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0answers
15 views

Linux - modify incoming packets before forwarding: [on hold]

I'm using a Linux (Debian based) system on which IP forwarding is enabled (/proc/sys/net/ipv4/ip_forward is set to 1). I can read the incoming packets using a raw sockets program, but I want to modify ...
0
votes
1answer
24 views

gnupg 'libgpg-error.so.0 no version information available'

I'm trying to compile gnupg-2.1.0 for Debian Wheezy, I've downloaded and compiled the required libraries (libgpg-error-1.17, libgcrypt-1.6.2, libksba-1.3.2, libassuan-2.1.3, and pth-2.0.7 in that ...
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0answers
22 views

Monitor network statistics with vnstat on CoreOS?

I notice that vnstat isn't installed on CoreOS. Is there a comparable way to monitor network usage on a CoreOS cluster? Certainly one could run vnstat through a Docker container but I assume that ...
-2
votes
0answers
16 views

Error when I rsync site to vesta before adding it to the CP

Well I rsynced all the sites folders from my old host to one running vestacp with the idea to add them and configure in the VestaCP later. Seems that when the directory with the site is already ...
0
votes
1answer
22 views

Monit failed to start shell script

So I am having a problem with monit starting a process this is my code: check process program_1 matching "program_1" start program = "/home/user1/files/start.sh" stop program = ...
3
votes
3answers
41 views

Add a Message to be Displayed During Shutdown of CentOS 6 and 7

When issuing a reboot or shutdown I see: [kbrandt@ny-kbrandt01: ~] sudo reboot [sudo] password for kbrandt: Broadcast message from kbrandt@ny-kbrandt01.ds.stackexchange.com (/dev/pts/3) at 14:50 ...
-1
votes
0answers
18 views

Can I connect two Linux systems via USB? [migrated]

I would like to hook up my new Raspberry Pi A+ to an older B model without having to connect the A+ to WiFi. Can I connect them somehow via USB? Can I do it with a hub in between?
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votes
0answers
16 views

iptables NATed traffic is not getting ack back

Ok, I'm trying to setup the classic iptables DNAT/SNAT scenario (RHEL 6.5, 2.6.32-431.17.1.el6.ppc64 kernel ): *Host A 172.16.0.0/24 nets Host B 172.16.0.0/24 + 192.168.0.0/24 nets Host C ...
2
votes
3answers
44 views

java program out of memory before reaching xmx

On a Redhat CentOS 6.4 are only a few process running, using about 3GB RAM (System has 12GB available). One of the processes is a WSO2ESB Server (java), we start it with those parameters: -Xms2048m ...
-1
votes
1answer
27 views

Ubuntu server suddenly freeze 12.04LTS

I am using Ubuntu to host a Java server application and apache2 for website. The server is running well for a month and it suddenly get frozen. The java server application has no response. Apache ...
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0answers
14 views

Monitor link status with monit

Does anybody know a good way to monitor an ethernet link status (packet losss, connection loss) with monit? The default config file only provides 1 example for network monitoring (through pings and ...
-1
votes
0answers
43 views

Convert all received attachments into PDF files [on hold]

I am trying to make my server do the following: Receive email Check for attachments in the email message If there is an attachment; check for the attachment format If it is doc, jpg, bmp, etc ...
2
votes
2answers
41 views

Putty Kerberos/GSSAPI authentication

I configured a few Linux servers to authenticate with Active Directory Kerberos using sssd on RHEL6. I also enabled GSSAPI authentication in hopes of passwordless logins. But I can't seem to get ...
0
votes
1answer
27 views

Is Ploop a bad idea for OpenVZ?

I know that with Ploop you lose disk space as files are added/deleted within a container and you have to manually compact the container, but i have also read that if you reboot or there is a crash the ...
-1
votes
0answers
11 views

how to get tripwire to warn if a file exists

When I configure tripwire policy, I have to comment out files that don't exist so tripwire doesn't give an error. But what if I want to test for a file suddenly existing? Suppose I want to test, for ...
1
vote
1answer
27 views

Different postfix relayhost based on system user?

How do I configure Postfix to send email through a different relayhost based the system user? The current setup has relayhost= set so all mail goes through that smtp server but I would like Postfix ...
0
votes
0answers
16 views

Centos and Strongswan

I'm trying to implement a strongswan solution for a site to site tunnel between me and a third party vendor. My tunnel establishes fine between myself and the vendor however I am wondering if this is ...
-1
votes
2answers
36 views

How to manage server configurations for small projects and servers? [on hold]

I have been developing a web application which recently launched. Now I am continuing with improvements and want to create a staging server similar to the production server. I know of the existence ...
1
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5answers
58 views

Get number of TCP established connections

On a Linux server one can use netstat -tan | grep ESTABLISHED| wc -l but this will not work on a high load server with watch -n1. Such approach works fine if the server is not very busy or the ...
1
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2answers
100 views

Managing IPv6 rDNS

Still very new to IPv6 and I talked to my datacenter and they do not do rDNS for IPv6. Unfortunately we currently do not support rDNS for IPv6 allocations. We can however delegate the IP block ...
1
vote
0answers
24 views

Improve read performance on ext4 on Centos with software raid1? [duplicate]

I'm running a number of MongoDB nodes on dedicated servers running Centos6. Each machine has two SSDs which I have in Raid1 with two logical partitions: # df -h Filesystem Size Used Avail Use% ...
-1
votes
1answer
30 views

How to release the physical and virtual memory used from the mysql server? [on hold]

Several php scripts are executed from cron on my CentOS 6.5, every php script contain database requests. Depending on the php object size and type the database requests can allocate too much memory. ...
0
votes
1answer
27 views

when is the jvm heap allocated by the OS

One of our sap systems(PI ABAP+JAVA stack) was giving performance issue. The entire 64GB configured for the machine gets hogged up(and the 8 cores as well). Every one is suspecting the java part,but i ...
0
votes
1answer
22 views

What causes “SYN to LISTEN sockets dropped”?

A quite busy proxy server has lots of "SYNs to LISTEN sockets dropped". I learned one cause could be a too small backlog size. But in that case the "times the listen queue of a socket overflowed" ...
-1
votes
0answers
13 views

How to setup mailx to queue locally while forwarding to a relay

I have a mail-script running on about 40-50 servers, mailing me stats, logs, etc. about the machines. This script uses mailx to sendmail using the .rc file located in /etc/mail.rc. In this mail.rc I ...
2
votes
1answer
28 views

Using a JBOD for redundant NFS

I have a Xyratex sp-2224 JBOD enclosure (dual controller) and a pair of Dell servers with SAS HBAs installed that I'm looking to utilize in a redundant NFS cluster. The hardware isn't what I'm ...
0
votes
1answer
29 views

Can I compile PHP 5.2.17 on CentOS 6.5, then copy it to a similar server?

I have two CentOS 6.5 VMs/servers with Plesk 12 installed on both. On on of these servers, lets call it server 1, I have compiled PHP 5.2.17 - yes I know this is old etc. however two sites I host ...
0
votes
0answers
39 views

sshd with port forwarding left connections to localhost without counterparty process

After temporary tunnel setup from X.X.X.X , from where I ran ssh -R 1089:localhost:1089 for several days, I have noticed this. I wonder what processes is 2494/sshd connected to, as no counterparty ...
-5
votes
1answer
40 views

Is it possible to have file with no name? [on hold]

I recently listen to the argument at school. Two people were arguing if it's possible to have a file without a name. But I didn't wait for the end of it. So I'm asking, it's possible to have a file ...
-1
votes
0answers
20 views

Monitor traffic with endpoints [on hold]

I want to monitor traffic on my linux machine with metadata (remote IP, port) like ntop does, but a bit more like webalizer or cacti over time. vnstat does not provide connection metadata, but ...
0
votes
2answers
23 views

Running startup shell script for ruby application as other user (not root)

I have installed RVM using 'user01' on Ubuntu 14.04 and user01 can start my rails application as expected. I, however, want to start this application following system start-up. I am trying to use the ...
1
vote
1answer
23 views

How to configure an additional BIND instance for a domain already described by other public name servers?

Background I have a small virtual server hosted by my provider and there I have configured a relatively simple combination of postfix, dovecot and roundcubemail (backed by nginx) that works OK. I ...
0
votes
0answers
4 views

linux: how to troubleshoot forwarded port? [migrated]

My home internet connection has a static IP address (eg: 123.123.123.123) I have configured my router to forward port 9000 to an internal host (192.168.1.101). That host is running Ubuntu 14-04. ...
-1
votes
0answers
23 views

Connection failed to MySQL server? [on hold]

My website runs on a cPanel server that I have root access to. About once every 2-3 hours I get an error message saying that the website can't connect to my MySQL database. The website and database ...
1
vote
2answers
58 views

screen command process id

First of all sorry for my bad english and i am new at linux. When i do this, it can write process id to pid file start () { echo -n "Starting someserver.jar: " java -jar ...
0
votes
0answers
17 views

Cannot query UDP services

I run a couple UDP services, one including Teamspeak 3. Unfortunately, I am unable to query either of these UDP services (I cannot connect to the Teamspeak 3 server) besides the TCP based stuff, ...
-1
votes
1answer
32 views

init.d script getting error

First of all sorry for my bad english Ok, i wrote a init.d script and i don't know its true or false (i am new at this things) #!/bin/sh . /etc/init.d/someserver start () { echo -n $"Starting ...
0
votes
2answers
39 views

How to configure ssh access for an unattended linux-distro ISO image for local development env similar to accessing cloud service VM instances?

I configured Packer.io to build unattended iso installs of various debian-derived distros to VMware fusion. As i configure the VMs manually for ssh access, it times out and the build artifacts created ...