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

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2
votes
3answers
56 views

Determine originating process for outbound traffic

I can see that my server is sending out a lot of traffic. If I go to netstat -apln | grep httpd I can see that all the traffic is going to one IP. Is there a way I can see what script / file is ...
0
votes
0answers
28 views

How to reset CPU counters?

I have a Linux server (Debian 2.6.32-46-amd64) which has been online for 117 days. The server is basically an Apache + MySQL, and MySQL was usually at 100~200% CPU usage (using top) being the server ...
4
votes
1answer
41 views

How do you actually create LVM snapshot?

I'm trying to test LVM, but I failed on first, potentially simple task - create a snapshot. I have following situation: root@debian:~# vgs VG #PV #LV #SN Attr VSize VFree big 1 1 0 ...
3
votes
2answers
487 views

Is it normal for PID's to be over 65535?

I have a managed VPS running on CloudLinux 6.6 x86_64 standard. It has a few websites with MySQL, PHP and Apache running with CPanel. I am working on a PHP system that needs to manage a PID and ...
0
votes
0answers
9 views

Nodejs remote debugging ports closed

I have a problem with nodejs remote debugging. I'm using centos on remote server and phpstorm on my PC. When I open putty: I type in command: node --debug-brk=5858 main_server.js, and the output is: ...
-1
votes
0answers
17 views

Horde groupware: Restrict access to selected IMAP users

System description Horde Groupware 5.2.3 on Debian Wheezy at home IMAP and SMTP servers at ISP (shared hosting) Horde is up and running and authentication is configured to use IMP. Q1: Being on ...
2
votes
1answer
44 views

Why does my linux server resolve all domains (even non-existant ones)

Currently every domain name resolves to my primary server, primary.example.com. So for example, if I ping randomdomain123.blah I get: PING primary.example.com` (1.2.3.4) 56(84) bytes of data. but ...
1
vote
0answers
28 views

What kind of situations should I enable IPv6 in my linux server?

As we know, IPv6 module is installed and enabled by default in our CentOS server. But I have never use it and many articles tell us to disabled IPv6 feature for performance or security reason. So what ...
-2
votes
0answers
10 views

Linux // Plesk - copying FTP backup to local repo via SSH [on hold]

where do I begin, I have a 20gb backup file on my FTP server saved directly from plesk with the automated backup service. I need to copy this to the local repository but plesk is taking forever to do ...
-2
votes
1answer
30 views

Point domain to VPS [on hold]

This is driving me crazy, since yesterday night that I am with this.. I read from everywhere but I have no success unfortunately.. I bought a domain on Hostinger and a VPS on ServerArc, what I what ...
0
votes
0answers
24 views

How to change mode from manged to monitor on mon0 interface on NIC?

I am connecting to a home router using wifi. The detais of my wireless cards are as follows: #lspci 01:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01) #lspci -vv ...
-1
votes
1answer
17 views

Is it advisable to put a /home in readonly mode when doing server transfer?

I am planning to move a lot Cpanel accounts to another server. Is it advisable to put a /home in read only mode to prevent users from making changes to their account while the migration is on going?
0
votes
0answers
11 views

Can not view Ubuntu desktop on VNC viewer [migrated]

I'm having problems on trying to connect to Ubuntu 14.04 via VNC from Windows. I'm able to stablish the connection but VNC isn't showing desktop icons. Futhermore, if i move the mouse on the VNC ...
0
votes
0answers
25 views

“NRPE: Unable to read output” while trying to run a script as another user

First of all: I know there were already questions about this issue, but even using their answers I still cannot figure out why my command is not working. What I want to do is call a script on remote ...
-1
votes
1answer
45 views

Give root privileges to an user just for a specific directory

I have have a web server running on my machine and I would like to give the 2 users, misterX and misterY, root privileges for the directory /var/www so that they can also edit the files that are being ...
0
votes
0answers
11 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 ...
-2
votes
0answers
16 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 ...
0
votes
2answers
20 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
votes
0answers
30 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
votes
0answers
19 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
vote
0answers
30 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
156 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
39 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 ...
-2
votes
1answer
13 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
31 views

Best Practice for Mailbox Backup (IMAP)? With Webinterface? [on hold]

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 ...
2
votes
1answer
26 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
votes
0answers
16 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
35 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 ...
0
votes
0answers
25 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
20 views

Error when I rsync site to vesta before adding it to the CP [on hold]

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?
-1
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
48 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
28 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 ...
0
votes
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 ...
-2
votes
0answers
49 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
43 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 ...
2
votes
1answer
31 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
18 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
38 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
vote
5answers
59 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
vote
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
31 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 ...