Questions tagged [redhat]

Red Hat is an open source technology solutions provider with offerings including Red Hat Enterprise Linux, open source applications, security and systems management, virtualization, Services Oriented Architecture (SOA) solutions, server and desktop operating systems, Java application software and services, and the JBoss Enterprise Middleware Suite. Please also consider whether or not the more specific RHEL5 or 6 tags might be appropriate as well.

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20 views

Need to make some Free space VG PE Size

I want to add 150GB space in Free PE /Size. How can I accomplish this? [root@localhost ~]# vgdisplay rhel01 --- Volume group --- VG Name rhel01 System ID Format ...
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What is the difference between 'Red Hat Enterprise Linux STIG - Ver 3, Rel 3' and 'Red Hat Enterprise Linux 7 STIG Benchmark -Ver3,Rel3'

I've been assigned to STIG our current rhel7 servers and when I go to 'public.cyber.mil/stigs/downloads' to download the zip file to import into stigviewer, I see two files. Red Hat Enterprise Linux 7 ...
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rsync + failed on error with Bad file descriptor

usually we not have this issue so its very rare! but today we got the following error when we are using rsync to copy files . when files - pkg_gh are with 1-3G size the error is like this Warning: ...
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rhel + resolve.conf + what is the right resolve.conf settings

we want to know what is the right configuration in resolve.conf and about domain name in resolve.conf in our rhel 7 server we configured the following example of resolve.conf more /etc/resolv.conf ; ...
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How to make Postfix route mails through sender-specific relay instead of smarthost?

I need all emails sent from a specific email address, example@example.com to get routed through a specific smart host (our 365 tenant). I've got it set up by setting in main.cf: ...
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Redhat PostFix implementation - Temporary lookup failure

Trying to set up PostFix as a simple relay server for apps and devices that need to send emails. If in main.cf I set relayhost = [1.2.3.4] where 1.2.3.4 would be IP of my email spam filter (...
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how to allow outgoing traffic with firewalld / libvirt on CentOS 8?

I installed a CentOS 8 guest on a CentOS 8 host using libvirt. However firewalld is blocking all outgoing traffic from the guest to the internet unless I use target=ACCEPT for the libvirt zone. The ...
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27 views

boot option to set MTU during RHEL install

I am trying to install RHEL-7.9 and it fails to download the installer image LiveOS/squashfs.img and goes into dracut emergency shell. When I tried to pull that image using curl it failed. Looking at ...
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How to remove warning about “System not registered - please register to enable updates and addons” on Red Hat 8?

I'm using a RHEL 8.2 system and don't wish to register the system, but I do want to stop getting this annoying notification. Similar to this question asked several years ago, except that while the ...
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What can cause a sudden jump in system time by +25 hours?

on the morning of April 29 I found the system time of my machine off by about 25 hours (in the future). Upon inspection of the logs I found this: Apr 28 04:47:44 my.host ntpd[772]: 0.0.0.0 0613 03 ...
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iptables dropping connections from vpn

I'm attempting to limit connections to port 3306 to a range of a given IP address that corresponds to our local network. I'm running iptables -I INPUT -p tcp --dport 3306 -j DROP iptables -I INPUT -p ...
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how to know if latest vmware tools version fit ESX version

we have rhel 7.6 OS version the default vmware tools version is vmware-toolbox-cmd -v 10.3.10.10540 (build-12406962) we upgrade the vmware tools as the following yum localinstall open-vm-tools-11.0....
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Systemd and Disaster-Recovery Stand-By systems

We're using systemd to run various services in production. (Duh...) We're building out a matching "disaster-recovery" site, which will have the same application installed -- with the same ...
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1answer
32 views

Red Hat doesn't find custom repo on install media

I'm attempting to create a Red Hat 7.8 ISO with a reduced set of rpms that have been updated to the latest version. I figured out how to isolate the packages I need and download them, but when I ...
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65 views

libreswan configure virtual interface for ipsec traffic

Description: I am learning how to configure ipsec with libreswan. I want to set up a host-to-host vpn between two hosts. I want each host to use a virtual interface for their ipsec tunnel. Problem: I ...
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RPM --queryformat FILEMD5S checksum is different than md5sum of machine

The RPM man page says: The FILEMD5S Tag The FILEMD5S tag is used to display the MD5 checksum for each of the files that comprise the package. Array: Yes (Size: One entry per filemd5s) Used with ...
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Systemd Service Start/Stop Before/After

So I currently have 2 scripts, let's call them script A and script B. What I need when the server boots is for Script A to start (this brings up a database) once that's done, it will bring up Script B ...
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Optimal ssl_bump configuration for whitelisted squid proxy

I've been banging my head against the wall for a few days now trying to get a whitelisted squid proxy to work. This is the first time working with squid 4.11 and don't remember having so many issues ...
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389 views

SSSD - Server does not see subdomains

Good morning, I have four servers in the same subnet, all running RHEL 7 and using SSSD to authenticate against an Active Directory domain controller. With one (and only one) of them I have an issue ...
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RHEL 8. linux OOM killer invoked to kill postgres process

Database is going to recovery mode whenever the OOM killer is invoked on the postgres process. /var/log/messages output with respect to the issue oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),...
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1answer
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Issue with removing LV disk space that was extended from another disk

I have a redhat server with two disks 100gb and 500gb. The 500GB disk was unused, however I then used it to extend the /var LV. The filesystem on all mountpoints are xfs and you actually can't reduce ...
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1answer
167 views

Getting libssl abd libcrypto conflict warning while compiling php on RHEL 7.8

I m getting following warning messages while compiling php on RHEL7.8 I am able to successfully compile and install php but I am not sure what will be the side effect of these warnings. Is there any ...
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1answer
15 views

Accessing default MPM prefork values in Ubuntu(debian based architecture) vs CentOS (Red Hat Enterprise Linux)

I was trying to list the MPM prefork default configuration values in apache web server. In ubuntu, apache web server, I could access the values inside /etc/apache2/mods-available/mpm_prefork.conf file....
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SSH hangs while executing remote script from a Daemon

I have a script which gets hanged while doing SSH from a Daemon , whereas it works perfectly while I run it from the terminal. Source Machine - redhat-rhel7.3-EUS-x86_64 Remote Machine - Solaris 11.4 ...
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2answers
29 views

RHEL PHP 7.3.5 with mysqlnd and apache

I'll start by stating I'm not a server admin by trade, so I've been struggling with this task. PHP 7.3.5 was already installed on RHEL7 running Apache. I have installed MySQL successfully and now I am ...
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128 views

What is the lifecycle of Oracle Linux for minor releases?

We are discovering Oracle Linux and considering the move from other RHEL clones. One question that's remains unanswered is: what's the lifecycle of minor releases on Oracle Linux? Do we get updates, ...
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Httpd Issue for Apache

I am having trouble starting the httpd service I have tried several ways from the internet still result is zero. I have attached the picture of the error. if anyone can help enter image description ...
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1answer
79 views

Jenkins vs shell scripts

why would Jenkins get a different result from shell scripts(redhat 7) alone? I have shell scripts that run fine if I execute them from a terminal, however when I run the scripts from Jenkins they get ...
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no login/no home dir user gets permission for denied (redhat8)

I am trying to solve a problem At work there is a given task where a python application is currently running on a server, this application is using a env file, which has username and password ...
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How to run a bash script from cron without being a root? [duplicate]

I'm using redhat 7. My user is not a root user, and the root user can't run the commands in the bash script file. I added the command that runs the script in crontab -e but it doesn't run. However if ...
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126 views

netcat-openbsd in RHEL/Centos (RPM)

There are two versions of netcat (nc) utility: netcat-openbsd and GNU netcat. For example, in some distributives like Debian or Arch user could choose which version of the package he/she would like to ...
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Linux rhel / centos, configure network bridge between two interfaces to communicate with secondary host (Using VMware)

Need I have two Linux hosts. Host1 and Host2. I need to be able to communicate with host2 on our network through a bridge built on Host1. Problem: br0 is pingable, but when ens161 and ens192 are both ...
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3answers
549 views

Server Not Found in Kerberos database - where is the database located?

Testing setup: Weblogic 12.2.1.4 running on a Windows 10 machine joined to an active directory JVM 1.8.0_281 The java web application is using Java GSSAPI to access the fileshare over Samba ...
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rhel + how to disable CPU's on my machine

We have physical Linux machine with 16 cpus lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 16 We want to disable ...
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RHEL 8.2 podman rootless container network bottleneck at 20Mbits/s

When I run container by podman 1.6.4 on RHEL8.2 (fresh install) with rootless user. The maximum upload speed per container will be around 22Mbits/s (with 1Gbits/s network) After start a second process,...
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Redhat 7 - IPv6 does not configure correctly on server bootup, only after resetting interface

we have some RedHat 5 servers which are running IPv4 and IPv6. We are migrating to RedHat 7 and using a similar ifcfg file. When the RedHat7 comes up after a reboot, all of the IPv4 IP's are ok but ...
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52 views

What is the best approach to managing firewalld with Ansible?

In the process of writing playbooks to configure firewalld (on RHEL) with Ansible, we've encountered some issues with juggling the running config and the configuration written to /etc/firewalld/...
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Why is load balancing not working in this server?

I'm trying to set up a load balancing using Apache and reverse proxy pattern. But I'm facing some issues. When trying the configuration, an HTTP 403 error is being responded. This is the configuration ...
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1answer
41 views

How to enable EPEL repository on RHEL so I can upgrade Apache [duplicate]

I want to upgrade Apache to 2.4.46 or later on RHEL 7. One step in the instructions I'm following is to Enable the EPEL repository, like so... cd /etc/yum.repos.d && wget http://mirror.centos....
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1answer
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Redhat 7.3 Sybase 16 (edge) issue with systemctl auto startup process

After installing Sybase 16 (Edge) and successfully upgrading a 15.7 instance to Edge, and then trying to add the sybase service with systemctl so that sybase starts up automatically when the Redhat 7 ...
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1answer
409 views

Create selinux context for systemd script?

I'm trying to create a systemd service that executes a custom script I wrote. It is just a backup script that I am using with a systemd timer. When I try to execute something simple in the systemd ...
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1answer
48 views

Slow File Transfer Speeds (~300kB/s) Between Hyper-V Guest and Host/Other Remote Machine in Azure

Slow File Transfer Speeds (~300kB/s) Between Hyper-V Guest and Host/Other Remote Machine in Azure I am seeing extremely slow file transfer speeds between the guest VM and the host VM or directly from ...
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1answer
66 views

RedHat 7: Is there a way to remove AD support from sssd?

We are a RedHat only shop. No Windows machines. All of our hosts authenticate with ldaps (636). Recently, there was a CVE about a Samba issue with Active Directory. CVE 2020-1472 We have absolutely no ...
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3answers
50 views

How to view journalctl without rebooting system in RHEL 7/8?

We're having issues with a customer having RedHat 7 PC's shutdown intermittently. One was just sent in for repair, and I'd like to check the journald output. However, I've read the rebooting the ...
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1answer
67 views

Do all servers have one base OS, like in RED HAT openstack architecture?

I'm a noob learning openstack. And The resources are all over the place tbh. I came across this image and would like to know one thing, So, Suppose I have 100TB of storage and 10 server grade ...
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1answer
188 views

Oracle Linux 8.3 can't find libyaml-devel

I'm evaluating Oracle Linux as a CentOS alternatives. During my tests I have to compile a package depending on libyaml-devel but the lib isn't present in the repo. I had the impression Oracle Linux ...
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1answer
125 views

linux + disk apears from lsblk but blkid not give the UUID

we have rhel 7.6 server with sdb and sdc and sdd disks the machine is physical machines with disk of 1.7T each of them we notice the sdd disk displayed from lsblk as lsblk | grep data sda ...
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1answer
69 views

rsyslog conf file syntax multiple filters

I'm setting up rsyslog on a Red Hat 8 system. I have the the first part working, that being filtering based on source IP, putting logs in a specific file, like this: if $fromhost-ip startswith '10.1.2....
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20 views

dmesg -T + how to expand dmesg info in order to verify history details

we have rhel 7.2 server from dmesg -T we see only the current date - Mon Jan 11 and not history dates as jan 10 , or less then jan 10 dmesg -T [Mon Jan 11 12:02:53 2021] Initializing cgroup subsys ...
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1answer
46 views

How to run wall command as another user in Linux (RHEL8)

How do I send a wall message as root (or any other user) and it not identify the original user? Looking at the below I would have expected wall to display message from root but it still shows admin1, ...

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