CentOS is a Linux distribution standing for "Community ENTerprise Operating System" and is a rebuild of "Red Hat Enterprise Linux" (RHEL), belonging to the same company that distributes RHEL (Red Hat, Inc.). The "CentOS7" tag refers to versions 7.x-xxxx of CentOS, working only on 64-bit hardware. ...

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Interface being deleted

I have a cluster consisting of CentOS6.5 and CentOS7 virtual machines. I've come across an issue where the network interface, eth0, is being deleted for reasons unknown and I'm looking for help on how ...
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1answer
12 views

how to control ldap users access using groupdn?

i am using openldap, nslcd and nss-pam-ldapd. i want to restrict users login to ldap client. i have configured this in centos6.5 without any problem using groupdn. but in centos 7, there is no ...
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2answers
29 views

Static IP address on CentOS 7

I just installed CentOS minimal and now I am struggling to give my machine a fixed IP address. This is my ifcfg-ens32 file: DEVICE="ens32" TYPE="Ethernet" BOOTPROTO=static IP_ADDR="192.168.0.243" ...
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36 views

`ldap_bind: Invalid credentials` during setup of LDAP server on Centos 7 VM

I am setting up an LDAP server on a centos 7 VM, by following the guide here. Everything is fine until the last part of step 4, after I create the base domain. I have not changed ldap.conf or similar ...
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26 views

DHCP client not getting IPv4 address from a DHCP server

I configured a DHCP server on a VM in VirtualBox. This machine has 2 network adapters, enp0s3 - NAT (from where I have my network connection) and enp0s8 - Internal Network (intnet). DHCP server is ...
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13 views

Openvpn Error opening configuration file:

I just set up openvpn with this script on clean centos 7. And I can't connect to server. I got following error in journalctl -xn 05:18:39 localhost.localdomain openvpn[1433]: Options error: In ...
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34 views

setfacl access files and directories by other group under RHEL 7

I exhausted all option on the setfacl to allow other group to access (cp, mv, touch ) a file and subdir of my directory. Background: I have a RHEL 7.2 and created 4 different users, as a (default by ...
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1answer
23 views

Missing firewallD in CentOS 7 VPS

i fresh installed CentOS 7 in a OVH VPS. but when i ran the command firewall-cmd i got this: -bash: firewall-cmd: command not found so i was looking how resolve that and i saw that basically i ...
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1answer
147 views

Using Lets Encrypt SSL for multiple Apache servers with distributed traffic

I'm having some issues setting up Let's Encrypt for a couple websites that are setup on two different servers, and have the traffic distributed to them via HAProxy. The servers have a number ...
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18 views

/dev/centos/root does not exist after migrating CentOS7 from vmware to Xen

I am migrating a CentOS 7 system from VMware Server 2 to XenServer 6.5. The CentOS system was installed using the minimal installation. I used ovftool to convert the .vmdk file to a .img using the ...
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KVM - libvirt qemu script make duplicates in iptables

OS: CentOS 7 Firewall: iptables libvirt: 1.2.17 Problem: I used guide to make port forwarding from host to gues machines. Link to guide: ...
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21 views

How to encrypt boot partition in CentOS 7 kickstart?

I have a kickstart file for CentOS 7 Minimal. I would like to add encryption only to my /boot partition. but when I added the following line in the kickstart file, the complete installation fails. The ...
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16 views

Problems installing pdftk on CentOS7 - libgcj issues

I'm trying to install a command line pdf manipulation program called "pdftk" on CentOS 7. I've tried several ways to get it installed and running into issues. If I try to install the rpm I get this ...
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22 views

CentOS Convert iptables rule to firewall-cmd rule [closed]

I have the following iptables-rules on CentOS 6: iptables -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --set --name ssh --rsource iptables -A INPUT -p tcp --dport 22 -m state --state NEW ...
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22 views

AD authentication on Centos7

I set my configuration on centos 6 and it works but when I pushed it on centos 7 it doesn't work. Here is my configuration : # authconfig --test caching is disabled nss_files is always enabled ...
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18 views

Cannot start container : failed to create endpoint X on network bridge:

I'm using following system: [alexus@wcmisdlin02 Desktop]$ rpm -q docker docker-1.9.1-25.el7.centos.x86_64 [alexus@wcmisdlin02 Desktop]$ cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) ...
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3answers
42 views

How to shrink /home and add more space on CentOS7

CentOS 7 file system is XFS, And resize2fs doesn't work. I need to shrink /home to 400G and add 100G space to /. What should I do? # df -h Filesystem Size Used Avail Use% Mounted on ...
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1answer
15 views

Prevent shutdown until ExecStop script completes

I have a script that runs infinitely at startup, and another script that shuts it down safely. The second script requires connection to a remote database. They are both declared in the same service ...
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2answers
22 views

Initialise Kerberos ticket on ssh login using PAM

Right, so I am struggling a bit with PAM in Centos7. I have no idea how to configure it manually and make the changes permanent so that I get a kerberos ticket after a successful ssh login. The ...
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25 views

CentoOS / Apache Cant reach webserver

I have CentoOS 7.2 and Apache/2.4.6 The Iptables are disabled/stopped. SeLinux is also disabled. setenforce 0 I can ping the sites on my vhosts list from outside the network and also can ping others ...
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1answer
82 views

How do i get Strongswan / IPTables to route data back to my road warrior client correctly?

I have a simple VPN. I have a client on 10.185.28.241 who gets a virtual IP of 10.42.42.0/24 from the VPN which is located at 10.112.18.105 and is providing access to machines in the 10.112.0.0/16 ...
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30 views

oVirt release36 on CentOS Linux release 7.2.1511 (Core) --> Failed to acquire lock: No space left on device

I'm running oVirt release36 on CentOS 7.2.1511. When I start the hosted virtual machine, I am presented with the following error: exitMessage = Failed to acquire lock: No space left on device I can ...
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2answers
50 views

Centos 7, Kickstart , Error setting up base repository during installation

I am trying to install centos 7 using kickstart on vmware 12. I have downloaded iso and installed many virtual machines using the same iso package. I am getting error: Error setting up base ...
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1answer
22 views

rkhunter: After some days I get “The system has changed to not using prelinking since the last run.”

We run here a (new) CentOS 7 system. To observe the system against invalid changes / hacker attacks we running rkhunter every night. Also after each (yum) update we prelinking all and running ...
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1answer
19 views

CentOS 7 Generic Cloud login?

I have an OpenStack cloud and added the CentOS-7-x86_64-GenericCloud-1503 image and it boots just fine, but I do not know how to login. What is the root password? How can I set it? Is there some other ...
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1answer
18 views

How to remove the sound driver from CentOS 7?

I have a centOS minimal installed and it the sound drivers loaded. I would like to remove all the sound drivers from my server. How can I do that? following are the command outputs from my server. ...
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1answer
47 views

Can connect via SSH - but not via SFTP? Exit status 127

Unfortunately I can not connect via sftp to my VPS: This is my sshd_config: # Package generated configuration file # See the sshd_config(5) manpage for details # What ports, IPs and protocols we ...
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1answer
24 views

Make Yum recognize that httpd24-httpd (from SCL) provides the webserver virtual package

I've recently discovered software collections and understand how they allow me to install multiple versions of software by introducing a namespace for each collection. On Enterprise Linux, this is ...
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1answer
72 views

SELinux setup for MongoDB

I'm trying to install MongoDB on CentOS 7.2 from the mongodb.org repository. So far so good, but the hoster has created a secondary disk (/mongo) for all the MongoDB data files. This clashes with the ...
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22 views

Create xfs system with mfks

I'am following a guide to install Zenoss which asks me to create a xfs system. To do this I need to run the following command: mkfs -t xfs Partition The guide says as follows: 'Replace Partition ...
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72 views

sysctl: cannot stat /proc/sys/net/ipv4/netfilter/ip_conntrack_max: No such file or directory

I try to change net.ipv4.netfilter.ip_conntrack_max by editing /etc/sysctl.conf net.ipv4.netfilter.ip_conntrack_max = 65535 and sysctl -p But i receive error: sysctl: cannot stat ...
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1answer
157 views

tmpfs partitions using a lot of space?

I bought a centos 7 minimal server with 512Gb x 2 NVMe SSDs in software raid 1 When I enter df -h command I get: [root@CentOS-72-64-minimal ~]# df -h Filesystem Size Used Avail Use% Mounted on ...
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23 views

Cannot recover tar.gz file Centos7

I need to recover my corrupted backup file I have gone through several methods to recover it but non of them is working. I have Centos7 server File to recover backup.tar.gz, Location of file ...
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1answer
52 views

Server full ram but not show which process is use much RAM

One of our Hadoop datanode with CentOS7 64 bit is using all of it's RAM, I tried to figure out which process is using so much RAM but couldn't. Please help me to check this please: System: CentOS 7 ...
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1answer
34 views

Centos 7 network issue

I have a Centos 7 server behind a Dell sonicwall I have configured the sonicwall to allow certain services and this seems to work fine. However I can't telnet to some ports. I have added Wireshark to ...
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34 views

Why does MariaDB hang on shutdown on CentOS 7?

I installed MariaDB 5.5 using the CentOS 7 packages (yum install mariadb mariadb-server). The server starts up OK and seems to work fine, but it won't shut down properly. Every time I do systemctl ...
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29 views

How to add a progress bar in CentOS 7 minimal kickstart installation?

I am installing a custom CentOS minimal iso. I would like to add a progress bar instead of displaying all the text into screen during the installation. I have added the following line to the ...
2
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1answer
55 views

How to investigate high CPU for dmeventd (lvm2 / xfs)

I have three CentOS 7.2.1511 Servers that started showing dmeventd at the top of the cpu utilization (single core). They are running docker and apache mesos. Even when I shutdown docker and mesos ...
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3answers
65 views

upgrading openssl in CentOS 7

First, I tried downloading the source tarball openssl-1.0.1s.tar.gz from openssl.org and doing a ./config && make install, and although it seems to have completed the process successfully, I ...
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3answers
47 views

What is the performance impact of disabling NCQ?

Our cluster system runs currently under CentOS7 with SSDs and NCQ disabled. What kind of a performance drop is to be expected within an i/o-heavy usage scenario? I'm not excepting a precise answer ...
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2answers
47 views

How to keep openvpn connection open on Centos

I access test server via shell and i use this command to connect to VPN sudo openvpn client.conf I want to keep the connection open with the VPN, something like service when you make service ...
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0answers
38 views

Firewalld blocks IPv6, ignores config

I'm trying to setup an IPv6 web-server on CentOS 7.2 with NGINX. I have tested my IPv6 connectivity outgoing and incoming - everything works. My IP, AAAA records, etc as fine as well. Essentially ...
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0answers
24 views

Centos 7 vsftpd - cannot modify files or rename folders - no write permission

I have just installed fresh centos 7 relase and i try to configure an vsftpd server. Server is set to use local users. Want i want to achive is to be able to write to /var/www/html There are ...
2
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1answer
56 views

ProFTPd timeout on LIST

Recently I've migrated a centOS 5 server to 7. But since then connection to FTP through FileZilla doesn't work unless I put FileZilla on FTP Plain Connection. TLS doesn't work when getting the folder ...
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2answers
137 views

CentOS reporting lower total memory compared others in AWS

I have a t2.medium instance running in AWS on the CentOS 7 AMI and I noticed in top and free it's basically reporting 3.45GiB of total memory. If I launch an instance with the AWS linux (I think I ...
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37 views

Reload not restart of Mariadb on CentOS 7

Hallo I'm having MariaDB 10 installed on a CentOS 7 and I'm looking for a way to reload a tweaked server.cnf. I'm not looking for a restart as I'm having a script running that takes over a month to ...
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18 views

CentOS7 install on ESXi6 shows blank black screen after selecting install or test from menu

I'm trying to install a fresh version of CentOS7 on a new ESXi host we have setup. I can create the VM just fine, and select the CentOS7 ISO from the datastore. Once I boot the VM up and open the ...
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1answer
53 views

How to compile drivers for Centos 7 with mainline kernel 4.5.0.0-1 from @elrepo-kernel

When using CENTOS 7 with Kernel 4.5, I can not yum install kernel-headers with the same kernel version. I am stuck on 3.10, which is what Centos comes with. How can I install Kernel-headers 4.5 and ...
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0answers
12 views

ISCSI Targetcli backstores fileio attach an existing image file

I can't seem to find an answer to this simple question. How do I attach an existing raw image file as an iSCSI backstore target using targetcli? I am using CentoOS 7. In targetcli I can get into ...
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1answer
63 views

Sensu API not responding. Uchiwa: Connection error. Is the Sensu API running? Redis Issue

I have been setting up sensu on CentOS7.2 for the first time following the official docs over and over however I have not been able to get it to work: I cannot seem to connect to the API. Uchiwa ...