CentOS is an Enterprise-class Linux Distribution derived from Redhat Enterprise Linux sources freely provided to the public.

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rich rules in firewalld to log imap and smtp attempts

How can I set up rich rules in firewalld that will record what is happening when a remote Thunderbird client tries to connect via imap and smtp? I imagine that two rules might be required, one for ...
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6 views

RHEL 5 box constantly displaying NIC statistics on console screen, how can I disable this?

I have a RHEL 5 box that is constantly displaying nic statistics on the console screen when using the KVM. This makes it very hard to do any troubleshooting when the box goes down as these statistics ...
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1answer
175 views

unable establish remote imap connection, why not?

A remote CentOS 7 web server is able to successfully receive email sent from elsewhere on the internet addressed to me@mydomain.com . An app running on the same CentOS 7 server is able to use ...
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1answer
66 views

Starting Services without Systemd?

Is it possible to start services on and post startup in CentOS/Fedora distributions without using systemd (systemctl)? If yes, how? Systemd does not work in non-privileged docker containers; ...
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13 views

Where can I find the server config that I am using to send emails with sendmail in CentOS 5.6?

I have a CentOS 5.6 VM and have been able to send emails from my PHP application up until two days ago. I am trying to find the SMTP server config details in my sendmail files somewhere, but I cannot ...
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1answer
67 views

What is the proper encoding name to use in locale for UTF-8?

Just wondering here as I have on this CentOS 7 system: $ locale -a <snip> en_US.utf8 <snip> and yet: $ localectl System Locale: LANG=en_US.UTF-8 To add to that, the preferred name ...
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21 views

Refresh/reinstall CentOS 7 in automatic mode remotely

Is it able to fully reinstall (with erasing disk data) CentOS 7 without physical access to the computer, only remotely SSH?
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1answer
40 views

Which unix / linux flavor should I learn looking at job opportunities in future? [closed]

I am a Computer Engineer and I want to start exploring the Unix & Linux environment. Which flavor of Unix and also Linux should I learn looking at a job opportunity in these two fields in future? ...
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2answers
310 views

Delete files older than specific file

I need to delete from a folder all files older than a specific file. Running bash on CentOS 7. I have a solution for this, but I think there should be a more elegant way do it: ...
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1answer
24 views

unix2dos not recogonizing outfile

I typed unix2dos /path/to/filename_unix.txt /path/to/filename_dos.txt in the CentOS 7 terminal, but I got the following in response: unix2dos: converting file /path/to/filename_unix.txt to DOS format ...
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1answer
50 views

Why scripts run as user but not as a cron?

I have a script that checks to see if port 4000 is open and listening, if it is return true, else start a service that also outputs a logfile. The script runs fine if I execute it as a user, but if I ...
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1answer
129 views

Desktop gone after upgrade to Centos 6.6

I upgraded a local Centos VM from 6.5 to 6.6. After the update, no restart is needed and the desktop works. When I restart, I see the blue startup bar and CentOS 6.6 on the right side of it. When the ...
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150 views

Centos 7 boot up with custom kernel problem

I have installed centos 7 on virtualbox machine which has kernel-3.10.0-123.20.1.el7.x86_64. I am trying to build Linux kernel from kernel sources. I downloaded the kernel source files from: ...
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1answer
188 views

firewalld settings for OpenVPN with https, ssh, and smtp

I am configuring a remote CentOS 7 webapp server to wrap https and ssh inside OpenVPN, while keeping smtp running outside of OpenVPN. I notice that, when I establish an OpenVPN connection from a ...
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1answer
246 views

“No package stress available, nothing to do” and "bash: yum-config-manager:command not found

I am trying to install the stress package on CentOS 7 virtual machine running on vmware player on windows 7 laptop. I have tried many packages and have updated yum but whenever I run sudo yum install ...
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0answers
257 views

What's wrong with my NFS setup?

I had previously been able to configure an NFS server on a computer running CentOS 6.6, and to mount the file system in a Virtual Machine with the same OS and using autofs. Last week I did a fresh ...
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1answer
150 views

Question about CentOS and KVM virtualization and PCI Passthrough

I want to replace Windows Server 2012 R2 and Hyper-V on my homeserver with CentOS and KVM. My plan is to virtualize one Windows 8.1 machine and several smaller Linux machines like on Hyper-V, there is ...
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1answer
812 views

yum command not found, cannot install stress [closed]

When I try to install the stress package on SUSE11 and Centos 7, yum tells me that it isn't found or that stress as a command does not exist. Anywhere I have looked online tells me that it is as easy ...
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2answers
75 views

Delete/repair files with weird permissions/owner/group

I have the following files (output of ls -l): ?rw------- 6144 1684128777 2049835008 50331648 Jan 1 1970 image1.jpg br-xrwSrw- 25120 1987343475 1936028517 110, 110 May 30 2032 image2.jpg ...
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1answer
59 views

To be SOX compliant I need to keep years worth logs. Need help with particuliars

My company is going through an audit and I have taking over the role of Linux systems administrator unofficially. I see our current logging system has it to were we basically keep a months worth of ...
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38 views

Xvfb differences on Ubuntu and CentOS

I have an html screen capture utility built using Qt that uses WebKit. It basically takes html as input and produces a screen capture as a png. On Ubuntu desktop 12.04 the capture quality is ...
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28 views

Have CentOS push custom updates to windows 7 clients

Is there anyway do deploy updates for Windows OS desktops, from a custom source? I frequently work on computers, and installing Windows 7 with an OEM disk and waiting for my slow internet connection ...
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27 views

Temporarily mounted filesystems suddenly unmount

On a CentOS 7 machine, I've had several instances recently where filesystems mounted manually (not using an entry in fstab) suddenly get unmounted. This always occurs when I/O is occurring on the ...
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2answers
99 views

menu script over ssh

I have a script that asks for input from the user. When I run this locally it does what I want however I'd really like to run it over ssh. I've tried the regular ways I'd run a script: ssh ...
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1answer
43 views

Centos & PostgreSQL - cannot create database cluster

I have a server with CentOS 6. I installed on it postgreSQL 9.4, but didn't tell my mate and he installed 8.4 which included in CentOS by default. So we removed (service remove postgresql) both of ...
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1answer
23 views

Running xinetd and httpd on centos 6

We are running several centos 6.4 lamp stacks, and our backup solution (unitrends) has a client that requires xinetd. Can these two coexist on the same server? If so, is there any secret handshake I ...
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15 views

How to reboot OS in KRDC without command?

I cant enter the command because some app are been stucked. Ctrl+Alt+Del exit me into the Windows Logon Screen. Alt+PrtSrn+b reboot myself. What to do?
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1answer
36 views

How to reboot centos with hotkeys?

I stuck on installation in centos with some soft on error. How I can exit of installation proccess or reboot server?
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1answer
90 views

CentOS 7 very slow boot up after changing NIC

I have created a VM in VMWare esxi. I then cloned the VM, the clone receiving a new NIC along with a new MAC address. I change the IPADDR, HWADDR, and BOOTPROTO values and reboot the cloned-VM. ...
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1answer
181 views

multiple user-types/access-rules for OpenVPN on CentOS 7 and firewalld

How can I define separate roles for users and administrator in OpenVPN running on CentOS 7 server? Specifically, the users must only be allowed to https, while the administrator must be allowed to ...
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2answers
37 views

Ubuntu CentOS RHEL cross bash script su support

I know that title was a little ambiguous. Allow me to explain our issue. We designed an installer script on Ubuntu since Debian based systems are our primary core, however, some of our cloud based ...
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139 views

firewall-cmd doesn't work when called through OpenVPN connection, why not?

I recently set up OpenVPN to run on a remote CentOS 7 server. Once I establish an OpenVPN connection to the remote server from my local machine, I am able to ssh through the VPN tunnel with ssh ...
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1answer
152 views

LFTP mirror includes - including other directories other than what I've included

My question: How can I make sure LFTP only includes files AND directories using --include or --include-glob, and not download a bunch of extra directories from the root of the remote that aren't in ...
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19 views

How can I configure web server with virtual hosts and serve content using tilde

Have a CentOS Linux release 7.0.1406 (Core) where I have no domain, only the IP I need to configure it so that I can use as web host and serve the content of a directory located in for example ...
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1answer
229 views

changing default centos 7 workspaces

On CentOS7, using the gnome environment, I do not seem to be able to add, remove, or change the workspaces. I prefer to have 2 workspaces, or no workspaces, and understand the usefulness of the ...
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54 views

Modifying SELinux settings to allow for MySQL to run on CentOS7

I'm trying to install MySQL 5.6 on Cent OS 7 with SELinux enabled and am trying to get past the error (in /var/log/audit/audit.log): type=AVC msg=audit(1424111345.853:558): avc: denied { execmem } ...
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1answer
49 views

How to install libsnmp on CentOS 6.5?

I'm trying to use software on my server that requires libsnmp. I tried running: yum list libsnmp But it says: Error: No matching Packages to list I also tried: yum search libsnmp But it ...
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0answers
104 views

GSettings / DConf settings not saved permanently

I have a problem with GSettings /Dconf on my Centos 7 + Gnome Classic box. I'd like to turn the desktop animations off with the following command: gsettings set org.gnome.desktop.interface ...
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68 views

launching fish shell to new terminal of tcsh on centos

I have downloaded fish shell on my centos, but when I switch command to /bin/fish or even try to run xterm -e /bin/fish I am getting following error: Standard input: echo $_ " "; __fish_pwd ...
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1answer
23 views

CentOS Black Screen after 4+ hours of indexing

I am running a CentOS virtual image on virtual box. It has liferay and solr installed on it and I am trying to index a Lar file that is 50+ MB of metadata. This is estimated to take more than 12 hours ...
2
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1answer
63 views

Ghost vulnerability - recompile C/C++ programs?

I've CentOS 6.0 server with glibc-2.12-1.7.el6.x86_64 running many open source services and some of my own C programs. To fix ghost vulnerability, I need to update it to glibc-2.12-1.149.el6_6.5. ...
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1answer
283 views

How to install keepass2 on CentOS 7?

I am looking for instructions on how to install Keepass2 on CentOS 7 unfortunately no luck so far. Is there any rpm available anywhere? Any info will be much appreciated!
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21 views

VirtualBox state suddenly SEEMs to have been restored to an earlier time

I have CentOS 7 installed on my Windows 8.1 VirtualBox, and file-system sized 30Gb. It worked fine until this morning, then the storage became full (due to Downloads and Projects). I tried a tool ...
0
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1answer
91 views

Entries in /etc/crontab not getting called in Centos 6.x

I created a dummy entry in /etc/crontab, but it doesn't get executed according to the cron log: /var/log/cron: Feb 7 08:20:01 localhost CROND[22781]: (root) CMD (/usr/lib64/sa/sa1 1 1) Feb 7 ...
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2answers
44 views

how do I find the location of mysql drivers on CentOS 7?

MariaDB is installed on a remote CentOS 7 server. How can I find the location of the nearest equivalent to mysql-connector-java-5.0.8.jar in the server's file system? grep seems to only search ...
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1answer
430 views

What's the difference between “errors:” “dropped:” “overruns:” and “frame:” fields in ifconfig RX packets output?

Can someone please elaborate on the difference between the various RX packets fields in ifconfig output? For example, let's say I run ifconfig and see the following: eth0 Link encap:Ethernet ...
2
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1answer
60 views

calling javac from CentOS 7

I want to be able to use the javac command on the CentOS 7 terminal. How do I set the PATH variable in order to accomplish this? The following explains relevant aspects of my current environment. ...
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1answer
54 views

Frequently can't access Virtualmin via browser

I have a CentOS 5 server over at Digital Ocean which has Virtualmin installed (because I'm a newbie and still learning). Virtualmin is accessed by visiting https://ipaddress:10000 but that URL almost ...
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30 views

Compatibilty of the following softwares

I am a professor (Mechanical Engineering department) at a college which is making the transition from Windows to Linux. However, we are quite unsure whether all the CAE softwares that we use would be ...
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20 views

Automate a gratuitous ARP every x seconds

There may be another issue here, so any other questions or comments are welcome. I have a CentOS 6.6 VM running under VirtualBox. It is connected to a GNS3 topology using a UDPTunnel. Everything ...