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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2answers
2k views

Installing MySQL on CentOS throws error that cannot find mysqld.sock

I have yum install mysql in CentOS 6.4. Now, when I use mysql command, it throws the following error: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld....
3
votes
1answer
417 views

RAID 5 built using mdadm starts in degraded mode. Is this normal?

I am setting up a new set of drives on a CentOS 7 installation (10x1TB), however am seeing something annoying during the build process. When I attempt to build the array, it is immediately recognised ...
-2
votes
3answers
7k views

Cannot ping from CentOS 7 host, but I can browse and lookup domain name

I have new CentOS 7 box and I have a problem with the ping command. When I try to ping ping google.com I get time out and 100% packet loss, but I can dig/nslookup google.com, and I can browse ...
0
votes
2answers
8k views

Where to locate resolv.conf file in CentOS 7

I know that "/etc/resolv.conf" is auto generated file by "/etc/resolvconf/resolv.conf.d/head" when reboot Ubuntu 14.04. It's ok But where i can locate same "/etc/resolvconf/resolv.conf.d/head" file ...
2
votes
0answers
108 views

Linux - On boot do push-button-connect to strongest wireless

I'm trying to configure linux (in this case CentOS) to automatically connect to the nearest WiFi via "push-button-connect". This micro computer has no keyboard or display, so the goal is to hit the "...
2
votes
1answer
176 views

Reliable and persistent installation of the Nvidia driver on Centos 5

We have a bunch of computers controlling equipment that run on Centos 5. We also need to use the proprietary Nvidia driver, the default nv driver doesn't work correctly with some software we need. ...
2
votes
1answer
211 views

Installed coreutils on CentOS for sort --human-readable flag but it still doesn't work

I'm trying to do du -h | sort -h, but my CentOS 5.7 doesn't have -h flag for sort. So I installed coreutils Updated: coreutils.x86_64 0:5.97-34.el5_8.1 Complete! yet sort still doesn't have ...
0
votes
1answer
353 views

How can I programmatically access the contents of a Dovecot mailbox in CentOS 7?

I just set up postfix and dovecot on a CentOS 7 server using this tutorial. I am able to successfully create a mail record using echo "TEST" | mail -s "testmail" youruser@localhost && tail -f ...
3
votes
1answer
1k views

ACL/MAC Permissions for dovecot and postfix in CentOS 7

I am using this tutorial to set up Postfix and Dovecot on a CentOS 7 web server. But when I try to send a test email using sudo echo "TEST" | mail -s "testmail" newuser@localhost && sudo tail ...
1
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3answers
2k views

what is dhcpv6-client service in firewalld, and can i safely remove it?

In a CentOS 7 server, I type in firewall-cmd --list-all, and it gives me the following: public (default, active) interfaces: enp3s0 sources: services: dhcpv6-client https ssh ports: ...
2
votes
1answer
443 views

blocking all but specific ips from specific services in CentOS 7

In a CentOS 7 web server that needs to remain totally closed to the public, I need to block all ip addresses and then only allow specified ip addresses to access specified services. How can I ...
0
votes
1answer
166 views

/usr/lib/python2.4/site-packages/cElementTree.so: wrong ELF class: ELFCLASS32

yum update There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: /usr/lib/python2.4/site-packages/cElementTree.so: wrong ELF class: ...
3
votes
2answers
3k views

Cannot update glibc on CentOS 7

I have CentOS 7 installed. I want to install the APR package for Apache, and I'm told I cannot install it because it requires at least glibc.2.14 while I have glibc.2.12 installed. I have downloaded ...
0
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0answers
26 views

centos cluster set core/each_program

I'm using unix server (OS: centos5) and I'm using several clusters. Some clusters have 8 cores, other are 24 cores and etc. I execute jobs using this command. qsub -q cluster_name -d $PWD ...
7
votes
1answer
21k views

How to update glibc to 2.14 in CentOS 6.5

I want to install Android NDK on my CentOS 6.5 machine. But when I ran the program, it says it needs glibc 2.14 to be able to run. My CentOS 6.5 only has Glibc 2.12 installed. So I tried to update ...
1
vote
1answer
303 views

How to remove a service that keeps the system from booting?

I created a service that starts a script using exec, because it works on upstart. On systemd it keeps the system from booting, because it waits for my script to end, but since it is a webserver, it ...
7
votes
1answer
35k views

Where to find the Crontab logs in CentOS

First of all I'm using CentOS [root@a etc]# cat system-release CentOS release 6.5 (Final) [root@a cron.daily]# ps -ef | grep cron root 982 1 0 Jun14 ? 00:01:15 crond root ...
1
vote
1answer
63 views

SELinux ignoring configuration?

I'm using Vagrant and VirtualBox to run a CentOS 6.5 VM. In /etc/sysconfig/selinux I have set SELINUX=permissive. However, everytime I restart the VM, sudo getenforce shows SELinux as Enforcing. Here'...
3
votes
1answer
596 views

httpd doesn't serve relative url from tomcat, why not?

In a CentOS 7 server, I am trying to set up httpd to act as a reverse proxy for tomcat. I have httpd running perfectly in the sense that I type in http/mydomain.com and it serves up static content ...
0
votes
1answer
48 views

Panic fault when mounting LVM2 volume

I have a CentOS 7 system that I can boot using a live cd. The system HDD's have an lvm2 partition with 2 volumes /root and /home. I can mount /root volume without any problems in the live ...
1
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0answers
506 views

Add files to Centos Live CD

I'm trying to 'inject' 2 files into a Centos 6 live CD ISO. Process to date: extracted the files from the iso to ./files/ extracted the files from the squashfs.img to ./squashfs/ mounted the ...
2
votes
1answer
81 views

Why string comparision results always false

I am trying to do a one time check about apache's mod-status page for updates like this(this is just a test script): firstcontent=$(lynx -dump http://some-server/server-status-page) echo $...
1
vote
1answer
2k views

while installing centos error is that 'sda must have gpt label'

While trying to install CentOS 6.4 IN DUAL BOOT with win 7 there was this error "sda must have gpt label". I don't know how to fix it and I also don't want to repartition my hard drive.
0
votes
1answer
176 views

text colors in CentOS 6.5

I've got an inventory/ordering program that runs on cobol on CentOS. The program is pretty much all text-based and looks like an old DOS program. I did a reinstall of the server, updating from ...
0
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0answers
338 views

How to use binaries in jailshell?

I'm offering jailshell (on CentOS- whm) access to someone in order to use the folder sync tool called Unison (Some sort of bidirectional rsync) That's for the background. Unison is installed, as ...
4
votes
0answers
3k views

How can I reset an unknown root password if a file system check interrupts the startup sequence?

This morning I was helping a fellow admin with a crash that occurred on a CentOS 5.8 VM. Earlier in the day, the underlying SAN hosting various VMs experienced an issue and ultimately caused some ...
1
vote
1answer
1k views

How to block the social websites in centos through proxy?

I am installed squid in centos system. Blocked the social websites to all ip address through squid in my server systems. But someone access social websites through proxy websites, because lot of proxy ...
2
votes
1answer
13k views

unable to start nginx on centos 7

service nginx start Redirecting to /bin/systemctl start nginx.service Job for nginx.service failed. See 'systemctl status nginx.service' and 'journalctl -xn' for details. [root@myvps ~]# systemctl ...
9
votes
2answers
18k views

apache won't restart after adding VirtualHost conf file, why not?

In a CentOS 7 server, I get the following error when I type sudo apachectl restart after I add an include file at the bottom of httpd.conf: Job for httpd.service failed. See 'systemctl status httpd....
0
votes
0answers
321 views

DNS/BIND configuration to resolve *.mail.*.outlook.com subdomains

I'm running BIND 9.3.3rc2 on a CentOS 5 system acting as an SMTP server. Until last week, I haven't had any problems with DNS or name resolution. The only problems I have resolving are with subdomains ...
0
votes
1answer
1k views

how to make firewall changes permanent via firewall-cmd?

I am trying to open some ports in CentOS 7. I am able to open a port with the following command: firewall-cmd --direct --add-rule ipv4 filter IN_public_allow 0 -m tcp -p tcp --dport 7199 -j ACCEPT ...
0
votes
0answers
100 views

Unable to trap “CTRL+C” within kickstart “%pre” bash script

I'm using an interactive pre-installation bash script in a CentOS-7 kickstart image. I was trying to use "trap" to catch user Ctrl+C (SIGINT) and run some code as follows: trap_ctrl_c() { #Some ...
2
votes
0answers
520 views

Making static routes persist after a reboot

I have two VLANs (default vlan and vlan 5 for voip). I have 2 interfaces, one for each VLAN. My route table looks like this right now: Destination Gateway Genmask Flags Metric ...
1
vote
1answer
960 views

Thruk installation “failed to open socket”

I am extremely confused, and Google isn't really helping. Also, I'm kind of a Linux novice. I've taken a couple of classes, but that was all about how to configure things in a basic Linux setup. I'm ...
1
vote
1answer
531 views

Will I receive critical security updates if I lock CentOS yum to a specific repo version?

We run Citrix XenServer as our virtualisation platform. Presently we're right up to date with our XenServer service packs and hotfixes i.e. we're running XenServer 6.2SP1 with the SP1015 update ...
0
votes
1answer
181 views

Checking if a mail has arrived, if not then alert

I am using fetchmail in combination with procmail for mail filtering on CentOS where my mail contains various log messages. They serve me so I could search through my mail(logs) for error strings. So ...
0
votes
1answer
10k views

CentOS 7 add new user with root privileges

I am reading this tutorial, and trying to create a new user with root privileges and then block root access via ssh in a CentOS 7 server. The problem is that the new user is blocked from doing root ...
1
vote
2answers
1k views

script to add users to otrs

I'm looking for a fast way to import customer users into otrs (ticket system) I have an export from Active Directory with: firstname lastname password email username There is a script in the otrs/...
0
votes
0answers
7k views

CentOS 7 httpd failed to make connection with backend

In a CentOS 7 server with apache httpd 2.4 set up as an ssl reverse proxy for tomcat, I am getting an error indicating that httpd is not able to connect with tomcat. How can I resolve this error so ...
0
votes
0answers
8k views

completely clean re-install of mysql on CentOS 7

I have encountered problems with a mysql installation on CentOS 7. All the data is backed up, so I just want to completely erase every remnant of mysql on the machine and then do a clean install. My ...
1
vote
1answer
1k views

centos dropbox newest version not starting

I have some issues getting dropbox to run on Centos 6.3. These issues started after I recently got a security warning to upgrade Dropbox. Before this, the older version (not sure which one exactly) ...
0
votes
0answers
117 views

Setting different path for installation in python packaging

I am new to python packaging. My Command Line Interface (CLI) named virtdc modules has to be installed in /var/lib/virtdc. virtdc is the top folder structure /var/lib/virtdc/ framework/ ...
1
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0answers
184 views

How to configure nginx to dynamically read folders, user accounts/domains?

I have cPanel and Apache 2.4 on my CentOS 6.6 VPS. I installed Nginx as a reverse proxy. Everything works fine. I have 2 domains on the VPS & I'm able to configure them both on nginx. The ...
4
votes
0answers
978 views

How to disable sudo related logging for successful command execution under CentOS/Fedora?

You can disable sudo related log messages via adding something like Defaults:juser !syslog to our sudoers file. That is disabling logging to syslog. But under e.g. CentOS/Fedora there is an auditd ...
1
vote
1answer
162 views

Centos 5.01 can't connect to the internet

I am trying to download USB driver for centos 5.01 but I can't connect to the internet. I have tried to set ONBOOT="yes" , NM_CONTROLLED="yes" and BOOTPROTO="dhcp" on /etc/sysconfig/network-...
1
vote
1answer
988 views

Emails not sending to one specific domain

We have a AWS server where emails are delivered to domains other than our own domain. I have confirm that I can send an email to my gmail account but I can't send to my hosted gmail account. So for ...
0
votes
2answers
2k views

Service start and Permission denied

I have a script that execute a java program, and I want to create a service to start this script at boot time. So I've created a script called run.sh. /test/run.sh #!/bin/bash java -cp myjar:/test/...
0
votes
0answers
141 views

Configuration of “Same Host Name” for my all LAN Machines under squid proxy

I am having the network model as Modem N/w Switch ISDN (Airtel) -----------> Server(Centos) [Squid] -----------------> Client Machines. ...
1
vote
1answer
990 views

/sys: cpio: chown failed - Read-only file system (Building Passenger RPM using Docker) [duplicate]

While I'm trying to build rpm using Docker for Phusion Passenger 4.0.53 (https://github.com/phusion/passenger_rpm_automation), I get the following error. Any help is most appreciated. $ ./build -p /...
1
vote
1answer
666 views

CentOS 7 Crash on boot

Getting this message attempting to boot CentOS 7 BUG: unable to handle kernel NULL pointer dereference at 000000000000009B And then a kernel panic Happens when trying to boot from the OS HDD or ...