Questions specific to the CentOS Linux distribution. Use this tag if your question relates to how the CentOS distribution affects your problem; do not use it if you just happen to be using CentOS and your question is about a specific configuration detail or syntax.

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42 views

How to keep remote directory up-to-date with local directory automatically?

Say, I have a directory A on my local machine and B on remote machine(Both are CentOS 7). I am using rsync to sync between them. But I want to track my changes on local directory and automatically ...
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27 views

Samba Share to Require Password Debugging

I've recently set up Samba on one of my CentOS 7 servers and it works fine, it allows anyone to access it as long as they are on the LAN. Now I need to set up a second share that can only be accessed ...
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116 views

CentOs 7 - MobaXterm - X11 Forwarding per user

I am using MobaXTerm to connect to my CentOs 7 Server. I have set X11Forwarding yes in my /etc/ssh/sshd_config file. The root user is able to start the X11-Gui for example gedit. The other users ...
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126 views

apache server-status 403 forbidden azure centos vm

I get 403 forbidden for http://testapache.cloudapp.net/server-status. Below are the following exact steps I have followed. I created a new centos vm. Then ran yum install httpd Opened ...
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37 views

Empty output file in systemd unit file

I created the below systemd unit file (Centos 7) to run KMS server and logs the client requests to the kms-server.txt file. The service runs without any problem and responses to the client's requests ...
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14 views

Networking issues after XEN guest migration

Yesterday, after mirgation of my CentOS 5.3 VPS from ISP to my own local XEN, I was a little bit complicated: after changing all network settings inside: /etc/sysconfig/network-scripts/ifcfg-eth0 ...
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31 views

Dovecot… shadow - uknown user… how do I fix this

For one user in particular I have this maillog error and the user is unable to send files using SMTP WLMX002 dovecot[1402]: auth-worker(49961): shadow(user@domain.com,X.X.X.X): unknown user How do ...
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18 views

FTP Server Allowing Public FTP Users When Are Restricted

I'm configuring FTP on a Centos 6.5 Machine, First I disabled Firewall & SELinux on Machine With Relevant Commands. Then installed FTP Via Yum, enabled service on boot & in running session ...
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47 views

CentOS not booting up after showing 5 ducks

I have been trying to install CentOS on my system for couples of days, without any success. After creating a flash drive with OS and and trying to install OS from this, it only shows 5 ducks and ...
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136 views

NFS Share on Centos 7 Fails to automount

I have a fresh install of Centos 7. I cannot seem to auto mount an NFS share located on 192.168.254.105:/srv/nfsshare from the Centos client. Mounting the share manually however, works perfectly. ...
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122 views

Install wireless usb on CentOS 7 (VMWare)

I am very new to Linux. I have installed CentOS 7 on a virtual machine using a windows host. I am wanting to install my USB wifi dongle so it can be used on the CentOS 7 guest. (My windows does not ...
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145 views

Postfix cannot start but dovecot is ok

My postfix service cannot start. Here is message: Job for postfix.service failed. See 'systemctl status postfix.service' and 'journalctl -xn' for details. And here is service status: ...
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157 views

Mysql 100% 1 core CPU load

I have 8 cpu in server, and Mysql works only on 1 cpu core on 100%. How can I use all cores? my my.cnf [mysqld] safe-show-database query_cache_limit=1M query_cache_size=64M ## 32MB for every 1GB ...
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0answers
127 views

Apache SSL timeout is not matching settings

I have a CentOS 6.7 apache Server version: Apache/2.4.7 (Unix) server with both http and https ports configured. They are configured the same, except for the SSL specific settings. The most relevant ...
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31 views

Remove permanent redirect and clean DNS

I am experiencing "Server not found" errors since I did the following, in my server I had this domain structure: example.com -> permanent redirection to app.example.com app.example.com I removed ...
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120 views

httpd and mysqld used out of memory

I choose 512mb ram for my Centos VPS with very low traffic new website .but after 2,3 hours after rebooting, i have only 24mb free memory. when i use top command: 2981 root 20 0 37176 10m ...
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156 views

CentOS server can't be reached from local net after no active request to outer net for some time

I'm setting Wake-On-Lan of my CentOS server so that it can be wake up through Internet. I set a static ip address on my server, preserve the ip address on the router and create a static ARP entry of ...
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176 views

How to configure pam.d config files in CentOS

I am hardening a CentOS 6.7 VM to CIS standards. https://benchmarks.cisecurity.org/tools2/linux/CIS_CentOS_Linux_6_Benchmark_v1.1.0.pdf The above is the document I am using to harden the image. I am ...
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38 views

cups: connection timed out

Per title I'm showing connection timed out in the /var/log/cups/error_log. D [29/Oct/2015:17:43:32 -0400] cupsdSetBusyState: Printing jobs D [29/Oct/2015:17:44:04 -0400] [Job 11441] Connection ...
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51 views

Linux/CentOS - can't su after changing ownership

I mistakenly changed ownership of all files on a CentOS system from root to my login account. I can login but if I su I get: su: cannot set groups: Operation not permitted I don't need the system ...
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67 views

CentOS Running process not responding to kill signals and not context switched

An updatedb process on my linux server is not responding to kill signals. (kill -9 or SIGSTOP) [root@chroot-1 ~]# ps auwx | grep -i 4505 root 4505 99.5 0.0 59544 1256 ? RN 09:43 ...
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253 views

CentOS 7 - Forcing a disk to be /dev/sda

I've been wrestling with this problem for awhile now, and I've hit a wall and need help. In my system, I have 1 drive connected to a SATA port, an SSD. CentOS 7 is installed to this disk. Also in ...
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129 views

gmail Internal parse error: Illegal envelope To: address (invalid domain name): root@[1.2.3.4]

Sending e-mails to my own gmail account from a server without a domain name. When using internal hostname basinsrv.localdomain, cannot reply. Tried these non-default settings in main.cf: myorigin ...
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186 views

vsftpd 2.2.2 - 500 OOPS: priv_sock_get_cmd

I'm very new to Linux, and I'm currently experimenting with it and several services in order to familiarize myself to it. I've installed vsftpd to access the machine over ftp however I'm getting the ...
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18 views

Unable to update CentOS6.6 due to 404

For a long while I've had a scheduled call of 'yum upgrade' to keep my VPS healthy. Recently the update fails because no repositories can be found from the various mirrors. ...
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23 views

Restoring VG configuration from recovered drive

Had to reinstall CentOS on a server with three RAID 1 arrays. I installed the OS on sda (300g), and left sdb and sdc alone (they were not formatted or otherwise fiddled with). The OS is up but ...
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74 views

How to recover an Intel RAID 0 on a Rocks cluster distribution

We had a Rocks 5.5 distribution on our cluster and wanted to upgrade to 6.2. The "/export" partition was mounted on a Intel software RAID 0 array of 2 identical hard drives (HD) (/dev/sdb and ...
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50 views

Linux PAM: add specific lib to Makefile and compile a single module

I am dealing with the development of a custom PAM module for a CentOS7 system. As starting point, I'd like to use the project linux-pam, specifically: compiling only the pam_permit module; adding as ...
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376 views

Installing Docker on CentOS

I'm working through the docker installation guide. Running CentOS 7. I ran: curl -sSL https://get.docker.com/ | sh Output: warning: ...
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2k views

Bash session errors on commands: “fork: Cannot allocate memory”

I have a bash session open to a remote server and something is wrong. I created a directory "test" and touched the files inside touch 1 2 3 4 5. I then tried to copy the directory cp test/ test2/ and ...
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48 views

Cyrus Performance Tweaks?

Okay guys, I have put a lot of research into this so bear with me. Here's what I am up against. I have been working with RC for a long time and I know some awesome SQL tweaks that work wonders, etc. ...
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2k views

Adding CentOS 7 to Active Directory

I am having a hard time adding a CentOS 7 machine to my domain (Active Directory 2012 running in Windows 2008 mode). I am using realmd to join the machine to the domain. Here is what I have checked so ...
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41 views

Which Kickstart commands and options cannot be %included?

I'm using Kickstart to automate a CentOS 7 installation and I'd like to create a common Kickstart file so I can %include it. After some testing it seems like some commands (like text) cannot be ...
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37 views

Libgcrypt warning: MD5 used - FIPS mode inactivated

Last week I enabled the openSSH FIPS 140-2 module on Server "A", and that system works flawlessly (including tsql queries to a SQL Server instance). I recently enabled the openSSH FIPS 140-2 module ...
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405 views

Centos 7 Mail log?

Previously I was using tail -f /var/log/maillog on Centos 6 When trying tail -f /var/log/maillog in CentOS 7 it says: cannot open ‘/var/log/maillog’ for reading: No such file or directory tail: no ...
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201 views

How to stream webcam on linux vps with videolan and output to html

It used to be quite simple to stream my webcam facing out into the yard to the world on my website. However, telstra has changed things where can't find a way to point my webcam to anything but local ...
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75 views

Can't setup mount of EncFS on user login

I've tried to setup EncFS to be mounted on user login as described in this guide excluding the Password Utility section, however it works with little success. The EncFS works properly ...
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281 views

Vagrant + CentOS 7 - Apache fails to start, I don't see an error

I'm spending some time trying to provision a Vagrant box running from a CentOS 7 base box. After a fresh install of Apache, I am able to hit the server over http and restart the server, but as soon ...
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173 views

CentOS 7.1.1503 Minimal cannot install Gnome Desktop via yum groupinstall “GNOME Desktop”

I've installed CentOS 7 as a virtual machine using virtualbox. That part worked fine and I've got my network connection working properly. I've updated yum and that worked fine. It would seem that ...
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210 views

Centos 7 - Can't download RPM (Trying to connect with IPV6)

I am normally an Debian/Ubuntu guy, but I wanted to test the foreman on CentOS 7, but I am having some trouble with the rpm command. I have tried to disable IPV6 with echo 1 > ...
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71 views

iptables blocking incoming FTP traffic 2/3 minutes after being reset

On CentOS 6.6- At first, iptables was blocking access to my FTP server at all while it was on. After some research I added the lines to /etc/sysconfig/iptables that are suggested in the question ...
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60 views

How has this arrangement of RAID disks occurred and is it recoverable?

I some months ago set up two RAID arrays for a system under CentOS 7. I was somewhat confused that the device list included two entries for each array, i.e. one had /dev/md126 and /dev/md126p1. The ...
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360 views

Centos 7 GUI Freeze problem

I have installed CentOS 7 DVD ISO on my MSI GE70 Laptop that has geforce gtx 765m, when the GUI comes after 5 seconds screen freeze. Is this an nvidia problem? How can I solve it? I cannot disable ...
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1k views

CentOs7 Python 3.4 Install Method

This post relates to this question where I was asked to explain how I installed python3 on my system. I was attempting to install python3 on my system for development purposes. Something went wrong ...
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261 views

how do I mount an external hard drive connected via SATA Wire to CentOS 7

I have CentOS 7 installed as a guest OS inside VirtualBox running on a Windows 8.1 machine. There is a SATA Wire connecting the machine to an external hard drive that used to contain a dual boot ...
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565 views

PuTTY does not connect over SSH; other clients work fine

I have a CentOS system that I can connect to using several SSH clients (FireSSH, WinSCP, MySQL Workbench over SSH). For some reason, PuTTY, which was working a few days ago, can not connect. It will ...
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155 views

How to install a CentOS image manually?

I am moving my project from CentOS 6 to CentOS 7 and need to deal with the changes in the boot requirements introduced by CentOS 7, particularly the upgrade from grub to grub2. The gist of the problem ...
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104 views

compile ffmpeg centos

I used this Guide http://trac.ffmpeg.org/wiki/CompilationGuide/Centos To install ffmpeg in my VPS with CentOS 6 64. But it was installed in /root/bin/ and I need to install it in usr/bin/ to run ...
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1k views

saving file to usb stick while using linux boot stick

I am using the instructions in this youtube video to install CentOS 7 on a new computer that is running Windows 8. The tutorial uses UniversalUSBInstaller from PenDriveLinux, but the installation is ...
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959 views

USB WiFi on CentOS7

I've got a clean installation of CentOS 7 on a desktop PC and a USB WiFI Adapter (RTL8191SU 802.11n). Connecting through USB leads shows "USB Ethernet: connecting" in Gnome3's network status bar. ...