CentOS stands for Community ENTerprise Operating System, the most popular Linux distribution for web servers with almost 30% of all servers using it. Third-party software is not included in the base.

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In CentOS 6.6 yum update show some dependency error

When I update centos package it (sudo yum update). It shows following error like. Error: Package: 1:control-center-2.28.1-39.el6.x86_64 (@server1) Requires: libgnome-desktop-2.so.11()(64bit) ...
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4answers
27 views

fdisk - do i need it or can i make a filesystem directly?

i read about fdisk being able to creation partition / which is to break down a physical disk into several logical partitions. If i intend to utilize the whole disk as a whole, is it still necessary ...
5
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3answers
51 views

Is sendmail a smtp server? Is there any difference between MTA and mail server?

I am new to mail and do not exactly know how it works. I have seen administrators use sendmail to send out email. Is sendmail a smtp server or is it a client that need to relies on smtp server to ...
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1answer
23 views

Understanding fdisk -l output and calculating storage

I have basic understanding of disk. (Please correct me if i am wrong) I understand on 1 platter, there are 2 heads, 1 on top, and 1 on bottom. Both side of the platter is able to provide storage ? On ...
0
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1answer
40 views

devices inside /dev - are their naming persistent by default?

Can i check if devices like sda , sdb naming in /dev/ are persistent by default or there are some udev rules in place to create persistent naming for them ? Does udev itself create device naming ...
1
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1answer
40 views

tuning windows 7 to centos linux smb over a long distance VPN connection

I'll try to fill in as I can, but here's the basics We have a VPN (I believe running openvpn) between a site in singapore to a main site in london, with the main site.Its a purely ipv4network. We ...
2
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3answers
4k views

Cant get squid proxy to work

i need squid proxy on my centos server. But i just can't get it to work. I did yum install squid. Here is my squid.conf file (i removed all comments): acl all src 0.0.0.0/0.0.0.0 acl manager proto ...
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5answers
2k views

How to work around shell limitation of 'Argument list too long'?

How can I work around the bash shell limitation of 'Argument list too long' when using filename wildcards that match a ton of files in /tmp/? [my-centos4 tmp] rm -rf /tmp/myLocalFiles* bash: /bin/rm: ...
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0answers
20 views

CentOS / RedHat DHCP working, static is not

I have installed CentOS 7 minimal install without GUI when I setup network configuration with Webmin web interface or manually editing files with VI it does not work. When I use e.g. "yum search ...
1
vote
1answer
41 views

udev symbolic links - where is /dev/sda pointing to

It is said that udev create symbolic links identifying the actual device and /dev/disk/by-uuid is an example. [root@centos1 by-uuid]# pwd /dev/disk/by-uuid [root@centos1 by-uuid]# ls ...
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2answers
29 views

2 Separate Machines, 2 Static IP Address. No connection Outside ISP Network

I have two separate physical machines. The first one is running CentOS 6.6 x86_64, and the second is running Ubuntu 14.04 LTS. (also 64-bit) Here's the issue. Both servers have a direct connection to ...
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2answers
3k views

After minimal install Centos 6.5 doesn't see network

I installed an minimal Centos 6.5 (with standart VGA) on my laptop beside Windows 7 as dual boot. Now I want to install some extra features like XWindows but Centos doesn't reach the internet. It ...
1
vote
2answers
22 views

Allow SSH direct Root user login to particular IP addresses

I have configured ssh login disable direct root user, configuration are, /etc/ssh/sshd_config Port 1845 PermitRootLogin no AllowUsers SKBFSXDWA I would like to direct root login to specific ...
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0answers
9 views

Eclipse on new VM cannot download stuff, why not?

I copied eclipse into a new VirtualBox CentOS 7 virtual machine from another computer, but how do I get it to allow eclipse to download stuff from the internet? Here is the problem: Eclipse works, ...
0
votes
1answer
35 views

How do I configure VirtualBox to launch a VM from an external drive?

What steps do I need to take in order to use VirtualBox to access a CentOS 7 installation that is on a detached hard drive? Here is the situation: 1.) CentOS 7 and Windows 7 were installed on a ...
0
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2answers
28 views

udev - am i using it, where do i see it?

It is mentioned that udev present devices in /dev for devices that are presented to the kernel and it is use to create persistent naming. I have having 2 harddisk /dev/sda /dev/sdb. How does ...
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0answers
9 views

Correct kmod-megasr driver to install CentOS 7 on Intel Embedded RAID Technology II?

I am trying to install CentOS 7 on a server using RAID 5 on Intel Embedded RAID Technology II. I did need to install a special hardware key to unlock the RAID 5 feature. I have succcessfully ...
0
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1answer
32 views

PPTPD on CentOS: no connection

I have installed PPTPD on my CentOS server and try to connect to it from my Mac and my Android smartphone. Both failed. This is the log on my Mac (from ppp client): Mon Jun 22 22:11:58 2015 : ...
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0answers
17 views

Unable to connect to the proxy server

I have a vps with centos 6.6 x64 and I installed Squid using this tutorial When I using the proxy in chrome with "Proxy SwitchyOmega" extension I got this error Unable to connect to the proxy server ...
1
vote
1answer
24 views

how do I copy large datasets between two VirtualBox virtual machines?

I have two separate CentOS 7 virtual machines running in VirtualBox that is installed in a Windows 8.1 host. How do I transfer large amounts of data from one of the CentOS 7 virtual machines to the ...
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2answers
32 views

DHCP server used reserved IP

I am using DHCP server on centOS 6.5, I reserved an IP for specific MAC address my config file /etc/dhcp/dhcpd.conf option domain-name-servers 192.168.1.5, 8.8.8.8; ...
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0answers
14 views

Failed to start nginx on CentOS

I installed nginx on Centos7, I'm unable to start the service: #service nginx start Starting nginx (via systemctl): Job for nginx.service failed. See 'systemctl status nginx.service' and ...
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2answers
18 views

How to delete all files and directory except one named directory from a specific folder in centos [duplicate]

I want to delete all files and directories from a specific directory except for one directory. For the same operation I had run this command # rm -R -df !(dir_name_not_to_delete) It works in Ubuntu ...
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1answer
22 views

single user vs multi user mode (without networking) init level 1 vs 2

I tried init 1 (single user mode) and i am still able to switch between users. So this leads me to think that maybe other users is not able to login if i have a network (hence single user mode) Then ...
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vote
1answer
41 views

how do I access a CentOS 7 file system from Windows 8.1

I am using an Apricorn SATA Wire to connect a hard drive removed from another PC to the USB drive of a Windows 8.1 machine. The external hard drive is from a machine that had both CentOS 7 and ...
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3answers
3k views

“muxserver_listen bind(): No such file or directory” using todo.txt over ssh on Haiku OS

I'm getting this error after entering a password when connecting via ssh from a Terminal window, ever since I followed these directions to reuse ssh connections: "...consider appending the following ...
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2answers
3k views

Creating a USB stick for installing centos 6.x using DVD1 and DVD2 iso files

First, we create 2 partitions on the USB stick that is let's say 16GB. first partition is let's say only 1GB and the second partition is the rest of what is available. after we "w" write the ...
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0answers
7 views

Cannot mount CentOS 7 partition from external drive using Paragon ExtFS

I downloaded Paragon ExtFS to a Windows 8.1 computer and connected a detached hard drive using an Apricorn SATA Wire USB 3.0. But the Paragon ExtFS gui will not let me mount any of the components of ...
0
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1answer
16 views

VirtualBox claims a USB drive, but hosted CentOS 7 cannot access it

How can I get CentOS 7 to open a USB hard drive from within VirtualBox running inside Windows 8.1? I have VirtualBox installed in Windows 8.1 and I am using it to launch and use CentOS 7 within ...
0
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1answer
14 views

why do i keep getting the same $SHELL even i am on a different shell already

[oracle@SJOAM ~]$ echo $SHELL /bin/bash [oracle@SJOAM ~]$ sh sh-4.1$ echo $SHELL /bin/bash sh-4.1$ csh [oracle@SJOAM ~]$ echo $SHELL /bin/bash Why am i always in bash !? but the prompt are already ...
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1answer
18 views

using rpm -i in Linux as a normal user

I'm trying to run rpm -i to install an rpm but it fails. I must always use root to do the installation. why ? [alankoh@sjoam2 Downloads]$ rpm -i sqldeveloper-4.0.3.16.84-1.noarch.rpm error: ...
1
vote
1answer
27 views

Maximizing Window for Virtual Machine in VirtualBox

I installed VirtualBox 4.3.28 in Windows 8.1 and am running CentOS 7 within it. But the problem is that VirtualBox is placing a size limit on the frame within which CentOS 7 is visible. Here is a ...
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0answers
13 views

Stuck after reboot

I was trying to install centos on windows so I downloaded the iso image and I used unibootin to make a bootable usb device. After installing on my usb drive it asked me to reboot so I confirmed. I ...
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0answers
24 views

CentOS screen resolution on VirtualBox

I still have the same issue, and I stuck here for 2 days. Background: Install CentOS 6.6(64 bit) on VirtualBox 4.3.28. Already installed Guest Additions. The mouse works pretty fine after GA ...
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4answers
5k views

CentOS installing jre/jdk error

[root@jony source]# sh run.sh Error occurred during initialization of VM Could not reserve enough space for object heap Error: Could not create the Java Virtual Machine. Error: A fatal exception has ...
0
votes
1answer
63 views

FFMPEG auto installer with latest version

I found this software which compiles FFMPEG with the older version. Is there something like it with the latest version of FFMPEG. Or how how can i update the FFMPEG after this auto install.
1
vote
1answer
29 views

understanding Stats on folder in Linux

This is my stat output on a folder stat Downloads/ File: `Downloads/' Size: 4096 Blocks: 8 IO Block: 4096 directory Device: fd02h/64770d Inode: 259595 Links: 3 What does it ...
0
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1answer
44 views

Installing 64 bit CentOS using VirtualBox

I downloaded VirtualBox to a windows 8.1 machine by selecting the Windows (32-bit/64-bit) installer option at this link on the Oracle web ste. But when I try to create a new Virtual Machine using ...
0
votes
1answer
20 views

Windows 8.1 Virtual Machine pointing to CentOS 7

How do I set up a virtual machine within windows 8.1 pointing to a CentOS 7 installation which I would like to install on the same physical box? I have been encountering all sorts of problems ...
3
votes
3answers
6k views

Is it possible to put UFW on CentOS?

If so, how would I do it? If not, is there an easier way to set some basic rules on CentOS other than iptables? I'm more of an app developer and less of a sys admin.
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0answers
31 views

How to access access virtual raid drives created by another linux system that died

I had a server, red hat 6.4, that had 2 raid systems connected to it, but then the server suddenly died. I connected one of the raid systems to another linux system with centos 6.3 after installing ...
1
vote
1answer
27 views

xclock not showing (traditional X without X11 forwarding)

Server A -> 192.168.1.25 Server B -> 192.168.1.26 Both running Centos 6.6 with iptables off. No firewall in between. A$echo $DISPLAY :0.0 A$xclock -- Able to see xclock popup on the A screen ...
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votes
3answers
9k views

Why Centos still not using Latest kernel

As i have seen many changes and improvement in kernel 3.xx The improvement i like is dmcache which introduced in kernel 3.9 I have 3 server with centos installed on all machine Centos is still ...
4
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1answer
38 views

What does chmod 7760 <directory> do in CentOS 7 bash?

I typed the command chmod 7760 by accident. I meant to type chmod 770 and now I'm curious what the first command did exactly. After typing chmod 7760 , I typed ls -Al and the directory name was ...
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2answers
3k views

iptables not starting on CentOS 6

I am running CentOS release 6.5 (Final) and cannot figure out why my iptables is not starting. I may have executed some other command to permanently prevent the start up of iptables; I do not ...
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0answers
13 views

Rename files if already exists centos7

I have a vsftpd installed in my centos 7 server. The problem is that i have mutiple clients sent files concurrently to the same ftp, and i am not able to rename the client file. The filename is ...
0
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1answer
3k views

MySQL ERROR 2002 (HY000) on CentOS 5

I have problem with starting up mysql. When I type service mysql start All I got is ERROR 2002 (HY000): Can't connect to local MySQL server through socket /var/lib/mysql/mysql.sock' (2)** ...
1
vote
1answer
3k views

Setting up a second monitor in CentOS

I have CentOS installed on my laptop. I hooked up my TV via VGA and it works, just not as I'd like it to. The left side (on the TV) is cut off, like the image is justified too far left. I want it to ...
0
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1answer
4k views

domain MX record not found while installing Zimbra

I am getting this error: DNS ERROR resolving MX for localhost.localdomain It is suggested that the domain name have an MX record configured in DNS Re-Enter domain name? [Yes] named file: $ttl ...
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0answers
26 views

Why does the EPEL Repo fail on a Centos 7 VM on VMWare Workstation 11?

I created a Centos 7 VM on VMware Workstation 11 on a windows 7 host. I am trying to reach the EPEL repo using sudo yum update -y and I get the following error: [root@localhost vagrant]# sudo ...