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

learn more… | top users | synonyms (3)

0
votes
1answer
13 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
7 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 ...
0
votes
2answers
25 views

How to manage server configurations for small projects and servers?

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
1answer
11 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
93 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
20 views

Improve read performance on ext4 on Centos with software raid1?

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
24 views

How to release the physical and virtual memory used from the mysql server?

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
19 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
17 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
10 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 ...
1
vote
1answer
22 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 ...
-1
votes
0answers
20 views

Mismatch of IP Address in our linux machines?

I have few Ubuntu machines in which I have our app servers running which is trying to connect to another set of RHEL machines in which I have our Cassandra cluster running. Now as I said, my app ...
0
votes
1answer
28 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
34 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
38 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
19 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
21 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
21 views

Connection failed to MySQL server?

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
53 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
30 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
36 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 ...
-5
votes
0answers
47 views

Slow site, most time spent Blocking/Connecting [on hold]

My site is based on user-submitted content, meaning that users can upload images, etc. The problem is, my website loads extremely slowly on first load (before it caches). For example, here is the ...
10
votes
1answer
81 views

How do I make sec ignore a timestamp properly

I have a rule that is set up like so; In /etc/sec/rules.d I have; type=SingleWithSuppress ptype=regexp pattern=(\S+) sshd\[\d+\]: PAM \d+ more authentication failures\; logname=.* uid=.* euid=.* ...
0
votes
0answers
7 views

increasing shrink space in windows 7 [migrated]

I am trying to install Linux on a machine that is currently running windows 7 home edition. I want to keep windows 7 and install windows in a partition. So I went to Disk Management, right-clicked ...
0
votes
0answers
14 views

Connect to Oracle Linux 7 server via VNC from Windows 7 [on hold]

I'm in the process of setting up a small Oracle DB server, and am trying to figure out how to connect remotely to it. So far I've gotten to the point where I can SSH in to it, and can connect to ...
-3
votes
0answers
33 views

Linux super light-weight http/web service [on hold]

I know of Lighthttpd as a light-weight way of serving files via http, however, this does too much (CGI, Output compression, URL-Rewriting). I wonder if there is a way to serve files from a server, ...
3
votes
1answer
22 views

What is the default journal commit interval of XFS?

Ext3 and Ext4 have a default journal commit interval of 5 seconds, which can be changed with the 'commit' mount option. I can verify that my VirtualBox host indeed flashes its disk icon after 5 ...
-3
votes
0answers
58 views

Linux can't detect all memory [on hold]

I have a server with four nodes.The total memory size is 512G. After installing CentOS 6.5,I found the total memory is only 260G. And here is the information in /proc/buddyinfo : Node 0, zone ...
1
vote
0answers
19 views

Build a repository with apt-mirror for ubuntu with changelogs

is it possible to create an internal mirror of the ubuntu update repository with apt-mirror including all the changelogs. I have the following output when i ask for the changelog of a package: ...
-2
votes
2answers
41 views

How to use .htaccess and .htpasswd for selective redirects & passwords

In my /var/www/ directory I have many directories some like: /var/www/impdata/ /var/www/data/ So can I achieve this: When I go to: www.websitename.com/data/ it should give an 404 error. And when ...
-1
votes
0answers
10 views

How to test ebtables/ping between 2 bridged VLANs? [on hold]

I defined two VLANs: eth1.2 and eth1.3. I added them both to a bridge I created: br0. Now I want to 'play' with them using ebtables. I want to set some routing rules. My question is how can I test ...
1
vote
0answers
29 views

Is it overkill to use Ganglia and Nagios for one server? [on hold]

In my home I run a Plex/Data server. It basically just serves everyone's files and then Plex to play movies and such. A Teamspeak server also runs on it, but nothing major other than those tasks. I ...
0
votes
0answers
17 views

Encrypting SVN Store with ecryptfs

I previously had TrueCrypt setup to automount my SVN repos on the Subversion server at boot with an automated network script that used a keyfile on a protected share to mount the volume. Now that ...
-1
votes
1answer
42 views

Map drive from windows to linux file share [on hold]

What I would like to do is to fire up a linux based cloud computer and be able to map a network drive from a local windows computer to this remote linux cloud computer. Is this possible?
1
vote
1answer
18 views

Using sssd ldap access filter DENY based on group?

I am currently using sssd.conf to only allow login for ldap users that are in a specific group. I would like to do the opposite and DENY login based on group membership of a user, while allowing all ...
0
votes
0answers
46 views

KVM does not boot with .iso disk images. Device or resource busy?

I've been trying to set up a windows VM on my Ubuntu box by following the linked blog post http://www.pugetsystems.com/labs/articles/Multiheaded-NVIDIA-Gaming-using-Ubuntu-14-04-KVM-585/ So I have ...
-1
votes
1answer
22 views

Random 403 Forbidden error (Apache 2.4)

My Apache 2.4 (CentOS 7) server hosts multiple websites. Sometimes I get a 403 Forbidden (You don't have permission to access file X on this server) error when accessing any of the websites files ...
-3
votes
0answers
25 views

Map remote host to local ip (linux) [on hold]

How can I map remote host to local ip? For example: If I map google.com to ip 192.168.1.15 so when i ping 192.168.1.15 i get forwarded response from google.com Maybe Iptables or something?
1
vote
1answer
38 views

Is there a way to check the syntax of a crontab file without actually installing it?

I know that "crontab -e" performs a syntax check before attempting to install an edited crontab. However, I am looking for a way to verify that the syntax of a crontab file is correct, even if: the ...
3
votes
2answers
190 views

tcpdump truncates to 1472 bytes useful data in UDP packets during the capture

I am writing an application which work with network. To perform some tests I need to reproduce the flow which I had a day before. But at the same time it is not allowed to stop the current working ...
-7
votes
1answer
30 views

WHM install dropbox automated server backup? [on hold]

is it possible to make automated backup on dropbox business account for my server ? my server has over 100 website total backup size about 500GB is there any tutorial or example for my request ?
-1
votes
1answer
22 views

linux server still recognizes the old domain after changing it to new one

I have some Linux servers (RHEL 6.3 and 5.4) under one domain (MS Windows server 2008R2) and every thing was working fine, but we decided to change the domain from olddomain.com to newdomain.com, now ...
-2
votes
0answers
30 views

Unable to change root's password (Ubuntu)

all. Long-time Linux user here... but this one's got me stumped. root@hal:/var/log# passwd root Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully ...
4
votes
2answers
98 views

Server overloaded, acts like out of memory, but thats not true

I have a Centos 6.5 server, running QEMU-KVM virtualization: hardware: 40 CPUs 400 GB RAM software: Kernel: 2.6.32-431.17.1.el6.x86_64 Qemu: 0.12.1.2 Libvirt: 0.10.2 There are 3 guests, with ...
3
votes
3answers
84 views

Setting up FQDN in sendmail [on hold]

In this blog post he suggests echo '127.0.0.1 localhost EXAMPLE.my_domain localhost.localdomain EXAMPLE' >> /etc/hosts but ends the post with But this is a less desirable approach ...
0
votes
2answers
37 views

Dockerfile separation of concerns for a secure apache httpd server with respect to SSL certification files

Issue: In a non-docker solution, the SSL certificates can be located in /etc/pki/CA/.... and with references to these in /etc/httpd/conf.d/*.conf files. How must these SSL certificates be ...
-1
votes
0answers
12 views

xfs maintenance mode in redhat 7 [migrated]

In my desktop I installed redhat 7 and after reboot it went to maintenance mode, After entering the password it is not allowing to do a file system scan for root and every time it boots enters to ...