Questions tagged [centos7]

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. Maintenance updates for CentOS/RHEL 7 will stop on June 30, 2024, with full updates ceasing in winter of 2019.

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CentOS7: su /bin/bash: Resource temporarily unavailable

Whenever I try to change to testuser, I get resource temporarily unavailable message. The nproc and nofile limits are set to 65k. testuser runs multiple java programs. Did not exceed the nproc and ...
2 votes
1 answer
4k views

Kickstart install: what disk name should I tell Anaconda to use? (Installer running from USB thumb drive.)

I'm running the CentOS 7.6 installer from a USB thumb drive using a kickstart file. I'm installing to a system that has only one disk. In the bash shell of the installer, my system's hard drive shows ...
-1 votes
0 answers
13 views

How to stop deferred emails from powerMTA server [closed]

I tried many commands, but I failed every time. Is there any way to stop sending the deferred emails?
0 votes
2 answers
3k views

How is php-fpm socket folder ({/var,}/run/php-fpm) created on Linux?

I am setting up multiple php versions on CentOS7 (native and from remi repos). As installed, the native php-fpm ( is setup on a unix socket, while the (remi) php74-php-fpm would listen on a TCP socket....
3 votes
1 answer
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Trying to use keepalived for failover and forwarding but getting "Keepalived_healthcheckers[1706]: TCP socket bind failed. Rescheduling."

The goal is to get two different CentOS 7 VMs with keepalived installed to perform failover with VIP 192.168.1.11 and also forward the http (to become https shortly after this works) traffic to a ...
4 votes
1 answer
8k views

Send mail service start error

I installed sendmail on CentOS based on some tutorial. When I start sendmail, it showing sendmail failed error. Here the following command result: systemctl status sendmail sendmail.service - ...
3 votes
1 answer
9k views

id: user: no such user

I'm using Centos 7 to authenticate locally Active directory users using kerberos. I joined the realm with the Administrator and i can login/ssh through it/with it, nslookup working fine, and adcli ...
5 votes
2 answers
10k views

Kubeadm 1.24 with containerd. Kubeadm init fail (centos 7)

I try to install a single node cluster on centos 7, with kubadm 1.24 and with containerd, i followed the installation steps, and i did: containerd config default > /etc/containerd/config.toml and ...
0 votes
3 answers
6k views

/var/log/messages Not Created Although restart rsyslog.service

I use centos7 and /var/log/messages has not worked for a while although I restarted rsyslog.service. Its size was always 0. I then deleted the messages file, and restarted rsyslog again but it was ...
3 votes
2 answers
8k views

Failed at step EXEC spawning /usr/libexec/mariadb-prepare-db-dir

a bit of a newbie here so mind my obliviousness. I'm trying to install mariadb on a fresh Centos 7 server, though upon running "systemctl start mariadb.service" I get this malarkey: Job for ...
0 votes
1 answer
58 views

Firewall blocking not the IP-address, but the DNS-name

System: CentOS 7 I noticed on my server that some IP-addresses that I blocked are not actually blocked, but continue to hold connections. I started to look on the iptables-level and saw a strange ...
0 votes
0 answers
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Enable ethtool statistics in a QEMU CentOS Guest OS

I have a network interface available in a QEMU Guest OS running CentOS 7, and on the Host OS side it reports as: $ virsh domiflist --domain mydomain Interface Type Source Model MAC -...
5 votes
2 answers
6k views

Linux SMB to \\domainname ends up "tree connect failed: NT_STATUS_DUPLICATE_NAME "

Issue: From CentOS7 machine: smbclient -L %domainname%.com --user=%username% Result: tree connect failed: NT_STATUS_DUPLICATE_NAME This is especially when I try to connect to //domainname.com, ...
0 votes
0 answers
40 views

Why does a zombie process consume a large amount of CPU resources?

pcm-memory was found to become a zombie process in the system, consuming a significant amount of CPU resources. At the same time, the time field in top will become abnormal: this machine only has a ...
0 votes
2 answers
8k views

How to add a DUD driver to CentOS/RHEL 7 media (without network)?

I'm working on making an offline installer for something I currently build using PXE and RHEL 7. The servers concerned (Dell 14G) need an addition driver loaded for the RAID controller. In the PXE ...
0 votes
2 answers
199 views

Unable to SSH VM instance after OS upgrade & reboot of VM instance in GCP

My VM instance was on CentOS 7 I recently attempted upgrading that to Almalinux 8 using below link https://wiki.almalinux.org/elevate/ELevating-CentOS7-to-AlmaLinux-9.html#migrate-centos-7-to-...
7 votes
1 answer
433 views

Upgrade OS on ZFS file server

I need to upgrade the OS of my ZFS disk server from CentOS 7 to Rocky Linux 9. I am currently running ZFS 2.0.7, and if I'm correct Rocky Linux 9 uses 2.3. My tentative plan is to use the AlmaLinux ...
0 votes
2 answers
55 views

Is there a way to check if a new application has been deployed recently in glassfish in linux?

I am not sure if I made it clear. This is what I want to check. Say someone deployed a new .ear file few days ago that changed the version of the application. I want to test it.
2 votes
2 answers
2k views

nmcli is not working in Kickstart script

I have the following commands in a Kickstart post-install script: firewall-offline-cmd --new-zone=management firewall-offline-cmd --zone=management --add-service=ssh --add-service=snmp firewall-...
3 votes
1 answer
4k views

SSSD Sites with Active Directory

I am a Windows admin who manages our AD infrastructure. Our Linux team have been building some CentOS 7 VMs and configuring them to use SSSD to join the domain. The initial config was querying a DC ...
0 votes
0 answers
41 views

How to stop using NVIDIA card on Centos

I bought a machine many years ago that has an NVIDIA GPU installed. I no longer need the GPU and was going to give it to a colleague, but when I remove it, my system gets stuck booting at a step that ...
4 votes
6 answers
34k views

centos7: boot error dracut-initqueue after converting virtual disk

I installed centos7 on Ubuntu 16.04 KVM with qcow2 disk format. To deploy my centos machine I need it in vhdx disk format to support Microsoft's Hyper-V. I used qemu-image to convert it from qcow2 ...
29 votes
7 answers
19k views

CentOS 7 - end of life in 2024, then what

We are working on a software solution and some of our providers are really CentOS 7 centered. CentoS 7 will continue to produce through the remainder of the RHEL 7 life cycle, which will end sometime ...
66 votes
12 answers
127k views

Install a newer version of Git on CentOS 7

I like to enable Git "Push to Deploy" on my CentOS 7 server. Currently I only can get Git 1.8.3.1 via yum. I need a newer version. Do I have to build it from source or is there any repo I can use? I ...
1 vote
1 answer
139 views

Error setting up base reposotory while using pxe booting centos9 with kickstart file

I am trying to setup a PXE boot server in centos for unattended install of OS, for POC I am using a centos7 as a PXE server which is running on Citrix hypervisor, I am using a kickstart file. When I ...
0 votes
0 answers
92 views

Change IPSec IKEV2 VPN Default Ports 500 & 4500 To Anothers

For some reason OpenVPN is working on my local machine very well, But IPSec IKEV2 VPN not & it only works when OpenVPN is connect. I have a domain for IPSec IKEV2 VPN & in local machine vpn is ...
0 votes
0 answers
97 views

StrongSwan IPSec VPN - IKEv2 - LetsEncrypt Certificate Issue (building CRED_PRIVATE_KEY - RSA failed, tried 10 builders)

I followed the link below for setup IKEv2 VPN Using Strongswan and Let's encrypt on CentOS 7. How to Setup IKEv2 VPN Using Strongswan and Let's encrypt on CentOS 7 But info on that link has been ...
0 votes
1 answer
454 views

Windows vps performance

Windows vps performance is not as expected while I see this message in /var/log/messages. [ 7283.526915] kvm [34279]: vcpu0 disabled perfctr wrmsr: 0xc2 data 0xffff Its a KVM vps on 3.10.0-1127.19.1....
1 vote
1 answer
7k views

How do I extend the space of /dev/sda3 on Oracle Linux Server 7.9

Disk capacity is at 105GB, but the root directory (/dev/sda3) capacity is only 39GB, I want to increase the capacity. How can we do this? By the way, the OS is Oracle Linux Server 7.9. $ df -h ...
61 votes
4 answers
212k views

How to manage DNS in NetworkManager via console (nmcli)?

I have CentOS 7.2 (guest in VirtualBox, vagrant box centos/7, no GUI). I see there is a nameserver in file: $ cat /etc/resolv.conf # Generated by NetworkManager nameserver 10.0.2.3 But how to add or ...
4 votes
1 answer
5k views

Apache 2.4 with Kerberos Auth and LDAP Authorization

I am trying to setup an Apache SVN repository with Kerberos authentication and LDAP group membership authorization, so that only users that belong to a specific group can access it. Kerberos auth on ...
0 votes
1 answer
1k views

Should I allow LDAP through firewallD?

Setting up firewallD on Centos 7 servers. They use LDAP for authentication over SSH login. Do I need to explicitly allow port 389 LDAP on the default zone on FirewallD or because iv allowed SSH and ...
0 votes
0 answers
171 views

Limit maximum concurrent ssh connections per user does not work when shell is /sbin/nologin

I have a Centos 7 server and when I limit the maximum connections per user using the config file /etc/security/limits.conf it works just fine. See below an example of my configuration in that file: @...
0 votes
2 answers
119 views

Monit complains of checksum failure after MariaDB reinstall and upgrade to newer version

I have a Linode VPS running CentOS 7 and somewhat old versions of web-related services (because code I've written isn't ready for newer versions - I'm planning to build a fresh VPS with new everything ...
0 votes
1 answer
4k views

Port is open and apache is listening but on browser "ERR_CONNECTION_TIMED_OUT" error

i have centos 7 and installed apache server on vps. listening 80, 8002 ports in httpd.conf Listen 80 Listen 8002 also checked the $ netstat -anp | grep 8002 tcp 0 0 0.0.0.0:8002 ...
0 votes
1 answer
16 views

Slow transactions in sub-domain

Wonder if you can help solve this little problem. I administer a system that has Wordpress in the parent domain and an api being served from a sub-domain. Normally, the api returns results to its ...
6 votes
1 answer
6k views

What controls the cleanup of the /tmp/systemd-private* directories?

It doesn't seem like the systemd-tmpfiles service cleans up these folders because I have files in /tmp/systemd-private-*-httpd.service-*/tmp/ that are 27ish days old (the last time httpd was restarted)...
0 votes
1 answer
5k views

Forbidden You don't have permission to access this resource

I have recently installed apache 2.4 plus mod_ssl I am using this apache as a proxy server and redirecting traffic to tomcat. The issue I am facing right now is that everything works without HTTP but ...
2 votes
2 answers
7k views

zfs module not found on centos after restart

After I rebooted a CentOS server, ZFS does not work: $ sudo zfs list The ZFS modules are not loaded. Try running '/sbin/modprobe zfs' as root to load them. $ sudo modprobe zfs modprobe: FATAL: ...
2 votes
1 answer
12k views

How to run clamd by systemd as daemon on Centos 7

# rpm -q centos-release centos-release-7-5.1804.el7.centos.2.x86_64 # rpm -qa clam clamav-filesystem-0.100.0-2.el7.noarch clamav-data-0.100.0-2.el7.noarch clamav-lib-0.100.0-2.el7.x86_64 clamav-...
2 votes
2 answers
4k views

Clickhouse: Failed to get D-Bus connection: Operation not permitted - CentOS 7, no docker image

I am trying to set up a Clickhouse server on my WSL which is based on CentOS. After following instructions in this page, and installing the DB successfully, when I want to enable the service I get ...
1 vote
2 answers
4k views

virt-install: error: unrecognized arguments: (but no arguments listed)

Been trying to create my first VM with KVM but getting a cryptic error from virt-install. It's saying I have a 'unrecognized arguments' but does not say which argument: $ sudo virt-install \ >    ...
2 votes
1 answer
5k views

Kernel update not being applied even after reboot

Here is my server details cat /etc/*-release CentOS Linux release 7.3.1611 (Core) NAME="CentOS Linux" VERSION="7 (Core)" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="7" PRETTY_NAME="CentOS Linux 7 (...
4 votes
1 answer
7k views

Scripts in /etc/profile.d are being executed twice on login

Background Info: I am trying to configure a Linux server running CentOS 7 for multiple users. After installing java I want to globally set the $JAVA_HOME environment variable for all users and add it ...
8 votes
2 answers
21k views

Nodejs Nginx error: (13: Permission denied) while connecting to upstream

I'm trying to run multiple Nodejs applications on Nginx server running on CentOS 7. I noticed that when I run a Nodejs app on some ports I get an 502 Bad Gateway error in the browser so I checked the ...
0 votes
1 answer
471 views

Install and launch chrome in centos 7

I am trying to standup google-chrome with gui in centos 7 which is from AWS EC2, i followed all the steps as given below still i didn't succeed, your help much appreciated. Install chrome yum install ...
5 votes
1 answer
36k views

CentOS 7 Unable to Resolve Any Host Names

New to Linux and looking for friendly assistance. My company is re-configuring our network DNS infrastructure to point our internal DNS servers at two new CentOS 7 / BIND 9 machines in our DMZ ...
0 votes
1 answer
3k views

Start vsftpd instances by systemd target

Used: # cat /etc/centos-release CentOS Linux release 7.3.1611 (Core) # systemctl --version systemd 219 +PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +...
0 votes
3 answers
1k views

having issues while accessing Postgresql

I have installed postgreSql client 9.6 following this link postgreSql installation and I am using centos version 7 on Linux. It got installed successfully but I am getting some problems while ...
2 votes
1 answer
4k views

ISCSI target service on Centos OS 7 errors

I have problem with ISCSI Target Utils. Service started normally, but showing errors: systemd[1]: Starting tgtd iSCSI target daemon... tgtd[3138]: tgtd: iser_ib_init(3436) Failed to initialize RDMA; ...

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