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

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16 views

How to decide nginx access log buffer size?

This link says: The buffer size must not exceed the size of an atomic write to a disk file. For FreeBSD this size is unlimited. How can I find size of atomic write on my server? Is there any ...
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8 views

incrond Error - access denied on /home/*/abc/ events will be discarded silently

I am getting following error on Ubuntu in the logs. incrond Error - access denied on /home/*/abc/ events will be discarded silently I am trying to monitor /home/*/abc/ can be anything. Any ...
-5
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0answers
35 views

Shellshock / Malware [on hold]

I noticed recently and attack exactly like this: http://www.skepticism.us/2015/05/13/ The attacker is trying to access some "vulnerable" routes 123.56.118.97 - - [25/May/2015:03:23:47 +0200] "GET ...
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votes
1answer
9 views

Adding an admin user to a MongoDB

I'm using MongoDB 3.0.3, and I've been having issues with creating users. I created a user on the admin database using db.addUser('admin', '....'). I gave it dbAdminAnyDatabase privilege. The output ...
0
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0answers
17 views

Why c app is not writing to nohup.out

I wrote a simple master-slave failover setup for my two servers using c, running redhat6 which using udp heartbeats to monitor one another. In my app I'm printing out some information like, heartbeat ...
0
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1answer
40 views

System Information on terminal

This might come across as a silly question but is there any shell that will allow me to get the system information as the shell is active? What I mean is a shell like bash or similar that will show me ...
0
votes
1answer
8 views

Exception reporting with rsync backups?

I run rsync in the cron every 4 hours. This works well for backups, but it generates six messages a day to root for each successful backup. I know I can put the output to /dev/null not to get any ...
0
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0answers
11 views

MD RAID Array Often Starts Without All Drives

I find that, when I start/restart my system, my MD array often doesn't start with all of the drives even though the device-names haven't changed at all. I'll have to stop the array and reassemble it, ...
1
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0answers
36 views

ssh: transparent redirect of incoming connections based on host- or username [duplicate]

I have a Linux server with a single, static IPv4 address and several DNS entries pointing to the IP. The server hosts several Docker container, and listens on port 22 for incoming SSH connections. ...
0
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1answer
47 views

Starting to learn about IPtables, why do I need this rule?

I have been reading all day about IP tables, how the rules work, sets of rules for basic webservers, etc. Now I`m trying to configure my webserver with IPtables using this thread as a starting point: ...
-1
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0answers
7 views

dropbox_uploader upload in background?

i am trying to upload very large file to dropbox using dropbox_uploader , file size about 1TB , i want to execute upload process and close ssh console I've used this nohup ...
1
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0answers
15 views

Adding normal graph on memory usage per process to Zabbix

I need to monitor memory usage per process of processes on Linux. My monitoring tool is Zabbix. I found some links which describe how we can do it on windows. As an example I can refer to Host ...
0
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0answers
19 views

Nagios python plugin not working properly

I have installed ICINGA for monitoring my azure infradtructure. I want to monitor my DB Servers using python script which is here Now it is making connection to DB server but mode options are not ...
3
votes
1answer
79 views

ssh as user runs program with no authentication (neither password nor keys)

I'd like to set up a user on my system (Ubuntu 14.04 x64) such that people can run ssh example@myhost.example.com and see some output from a program without being prompted for a password or having to ...
0
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0answers
16 views

qemu-img VHD to raw image convert results in bad geometry:

Is anyone else able to reproduce this? Using StarWind V2V Image Converter on Windows, I'm able to get a valid disk.img file, so the source image.vhd is clean (pulled down from rackspace). Is this a ...
1
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0answers
14 views

Custom IPv6 stateless autoconfiguration suffix [duplicate]

When a router announces an IPv6 prefix via Router Advertisements, a host can use SLAAC to automatically derive the remaining bits from its MAC and use the combination as its globally routable IPv6 ...
-2
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0answers
12 views

While executing vgdisplay command on RHEL 6.5 gives me Input/output error for disk. But the server doesn't have that disks

Complete errors as given below: /dev/mapper/mpathcq: read failed after 0 of 4096 at 107374116864: Input/output error /dev/mapper/mpathcq: read failed after 0 of 4096 at 107374174208: Input/output ...
-6
votes
0answers
27 views

What means high ram vps and [on hold]

I want to rent a vps server for personal needs, so i found hosting provider who provides high ram vps and premium vps. What are the advantages and disadvantages respectively for high ram vps and ...
2
votes
1answer
41 views

Add a custom header to Postfix with the relayed domain

I've got a Postfix setup that allows relays only from certain domains. I accomplish this using the relay_domains flag in main.cf and it queries mysql to find the list of allowed domains. ...
0
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0answers
5 views

Who was the original author of logrotate and what year was it written? [migrated]

The question started as an internal team debate. But we realized we couldn't find any information about when the original version of logrotate was authored and who wrote it. Any idas?
0
votes
1answer
51 views

How much memory must be left to the OS with a java server application?

Suppose I am running tomcat with -Xms256m -Xmx1024m, but would like to increase my heap usage. What is the largest safe heap size I can allocate? For the purpose of this question, please assume, ...
0
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0answers
24 views

Some processes using 100% CPU and hangs on select() call for some time

So I have this strange scenario: there is a server this apache/passenger/Rails and some other services. For example top command itself takes 100% Cpu time (also iostat and ruby, other processes seems ...
0
votes
1answer
37 views

why my nat iptables rules dont work with marked packets?

System: debian squeeze, Linux server 2.6.32-5-amd64 #1 SMP Tue May 13 16:34:35 UTC 2014 x86_64 GNU/Linux, iptables v1.4.8 lsmod | grep iptable iptable_security 2176 0 iptable_mangle ...
-1
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2answers
30 views

Match BIND's view to certain users

It's easy to make a BIND's view to match certain IPs with the aid of match-clients directive. But is it possible at all for a view to match not IPs, but users? For example service a is run under user ...
0
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1answer
27 views

EC2 volumes & partitioning

With Amazon EC2 CentOS 7 HVM community image machine just thinking for volumes & partitioning. Would it not be good that I create default 8GB volume sda for root device for all operating system ...
0
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0answers
16 views

CentOS 7 mount ebs thorugh systemd unit

CentOS 7 HVM community image is not mounting the drive if as recommended we do it via rc.local(since doing it via /etc/fstab entry may halt the machine and make it not reachable if any issue occurs in ...
2
votes
1answer
20 views

EBS volume mount point should be disk or partition

With community CentOS 7 HVM image, after adding another EBS volume to my EC2 instance, lsblk command shows this NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda 202:0 0 8G 0 disk -xvda1 ...
1
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1answer
19 views

AUFS: How to create a read/write branch of only part of a directory tree?

AuFS (another union file system) allows us to merge two trees into one, even when those trees overlap. We can then direct writes to the merged tree towards one of the branches and reads to another. ...
0
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2answers
41 views

MySQL, NFS and symbolic links

I have been migrating an older server running apache2 + mysql under ubuntu to a new server running debian (wheezy). The migration works fine while the databases are storted localy (in our case ...
0
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0answers
16 views

DNS records for mail server [duplicate]

I've been toying with an old box I've got at home and decided it might be fun to set up a mail server. It's running a lightweight debian distro, postfix, and dovecot, along side a web server, PHP, ...
0
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0answers
14 views

Installing LTTng-modules 2.5.4 on CentOS 7

I am trying to install LTTng-modules 2.5.4 on CentOS 7, by building it from source because CentOS 7 is unable to install this package from RPM. Running "make" to build package contents results in the ...
0
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1answer
34 views

Cannot find error in iptables firewall configuration

I'm struggling with a firewall problem on my Centos server. I have the following configuration which when I use it with a service iptables restart and I try to ssh to the server with putty, I cannot ...
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1answer
23 views

Minimum System Requirements for MariaDB [duplicate]

I recently set up a CentOS 7 server on digitalocean, I went with the $20 a month plan because i found these minimum specs for MYSQL. When i did a LAMP install it had me install MariaDB instead. I'm ...
0
votes
1answer
16 views

Forwarding over a vpn

I have a group of AWS web servers which will need to get into the business of initiating and speaking TCP over a VPN to a third party. Don't ask me why a VPN is the third party's chosen solution; ...
3
votes
1answer
146 views

How to stop hidden mac hidden files are showing in other systems? [on hold]

If i copy the Images or files from mac to other os systems, it shows the files "._.DS_Store, .DS_Store" in other os systems.How to stop it?
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18 views

Clone Linux user (copy user, based on another one) [migrated]

How can I create a new system user, an exact copy of another one (having the same groups, permissions, privileges and settings), but with different username, password and home directory?
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10 views

Scalix - Finding out when a mailbox received its last email

I have an old email-server that I want to shutdown. To do that I want to know when each mailbox on that email-server has received its last email. Sadly i don't know much about Scalix, just a few ...
-2
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0answers
25 views

How manage developer server on linux? [on hold]

I want to have such things on my server: 1)Web app1 (redmine - ruby) 2)Web app2 (buildbot - python) 3)C++ compilation env for our project (fixed version of gcc and libraries) 4)some proxy for web, to ...
-2
votes
0answers
25 views

Unable to connect Linux/Apache to MSSql Database

I am using RHEL 6.5 on my Linux Server. I am trying to connect to our Database server which is hosted on an MS SQL Server. I have some perl code through which I am checking the connection with the ...
-3
votes
1answer
43 views

Not able to install MySQL server on CentOS 6.6

I tried this following command [root@n yum.repos.d]# rpm -qa | grep mysql mysql-libs-5.1.73-3.el6_5.x86_64 mysql-community-release-fc21-5.noarch [root@n yum.repos.d]# But I give followed ...
0
votes
1answer
24 views

How to restrict samba shared files access in web browser?

I have configured samba to share the files.But i want to restrict these shared files are showing except authorized users in the web browser. for ex: My smb.conf file is [Creative] printable ...
0
votes
1answer
26 views

Combining partition types lvm

I have an older disk setup that was made with msdos parition types and it appears that they kept growing the same disk in order to grow the lvm however it ran into an issue where it got to 2TB and ...
-1
votes
0answers
27 views

How do I visually analyze/check DDOS attacks? [closed]

How do I tell that a DDOS attack is happening on my servers? Is there a tool which provides visual cues to figure out what is happening or which IP is causing trouble, which IP to block. A simple ...
0
votes
0answers
26 views

How to connect between two Linux machines VIA Linux router machine [closed]

I have three Linux machines that connected as the following: Linux_machine1 --> Route_linux_machine --> Linux_machine2 How to ssh from Linux_machine1 to Linux_machine2 Only VIA ...
0
votes
1answer
59 views

Nginx Proxy not working

I'm trying to redirect all traffic from www.impactteachers.com/teach to application.impactteachers/teach. This way, our application form is also accessible from the following URL: ...
3
votes
1answer
61 views

Debian Server Keeps Restarting Unexpectedly

My laboratory' server with Debian-Wheezy-7.8-Stable keeps restarting few times after some hours of uptime without any notification. This server is set up for considerably high load numerical ...
0
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0answers
48 views

Dropbox Linux Segmentation Fault

Everything worked great for a year, and the server was untouched. All of a sudden my automation file transfers depending on Dropbox didn't work anymore. The dropbox tray icon is unavailable so I try ...
0
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0answers
29 views

How to log changes made in a particular file to syslog

How to log changes made in a particular file using syslog-ng. The log must contain the timestamp, hostname, user who modified the file and action performed. Is there any option other than audit in ...
0
votes
0answers
32 views

Squid returns (111) connection refused for some websites [on hold]

I've created a transparent squid in a VPS and some websites (http/https) are returning connection refused, even though others https websites as google, facebook are working just fine. Quite weird. ...
1
vote
1answer
32 views

Is smartd really reporting this drive is too hot?

"SMART Usage Attribute: 194 Temperature_Celsius changed from 146 to 150". This is on CentOS 6.6. What does this really mean? Is the drive really hot or is this perhaps a software bug? The drive is an ...