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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Is it possible to change the security policy in Centos 8 / RHEL 8 after the installation?

During the installation process, we have the option to choose different security policy profiles. For example: PCI-DSS Is it possible to change the security policy in Centos 8 / RHEL 8 after the ...
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10 views

Vnc server not working on centos

I was working with VNC server for the first time without any problem I followed this tutorial Now when I want to log I think I forget my password so I retype it many time and Im blocked I get ...
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1answer
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what is alternative to openldap [closed]

I have a storage and I connected it to a linux redhat server. Now I am trying to map that into several computers on the same network. I used to use openldap but for any reason, I am unable to set user ...
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How can i install an old samba version on Oracle Linux 7.5

Apologies if this is a lame question but i don't have much experience with subject.. I know that there are a bunch of posts regarding this but i wasn't able to find a proper solution... I running ...
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How to update Security Vulnerability on Rhel Linux (CVE Vulnerability) [duplicate]

I got a new assignment to update security vulnerabilities on Linux Rhel, maybe here all my friends have gotten a similar case. Please share your knowledge for this Security Vulnerability Update. Note:...
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Centos Forwardind by portfwd

I have Centos 7 I used portfwd to forwarding incoming connections form my centos 7 server to windows game server, But the Centos 7 server does not receive the connection from the Windows game server "...
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1answer
19 views

RHEL 7.8 - Different behaviors between `service X start` and `systemctl start X`

I'm currently setting up a RHEL 7.8 tomcat service and I'm having trouble with the service and systemctl commands. Context: the following file was set up on /etc/init.d/tomcat: #!/bin/bash # # # ...
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Can Kaazing 4.5 Gateway be configured to use server cipher preference

I have a Kaazing 4.5 gateway running on RedHat7 that currently uses client cipher preference when establishing a TLS session. Per https://kaazing.com/doc/jms/4.0/security/u_tls_works.html it suggests ...
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43 views

MariaDB Galera Cluster Rolling Upgrade - Replication Warning WSREP tx protocol version

I am upgrading a MariaDB Galera cluster from MariaDB 10.1.44 up to MariaDB 10.4.13 on Red Hat. I upgraded 1 member of the cluster and of course ran mysql_upgrade --skip-write-binlog when the software ...
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How to enable enforce_for_root under pam_pwquality.so in RHEL8 / CentOS 8?

How can we enable enforce_for_root under pam_pwquality.so in a persistent way? The goal is to force the root user set a strong password. I am aware that root is omnipotent and any restrictions can be ...
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What is the differences between to install docker-compose by binary or by pip install

We have two option that we can use in order to install the docker-compose We already installed docker , and now we want to install docker compose on production environment One option is by binary ...
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I can't install packages using yum [Errno 5] [Errno 13] Permission denied

I cannot install git package on server. Below is the output of yum command: [root@sbybz221033 ~]# yum update git Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-...
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how to know if we reached the max value of fs.file-max

on our linux rhel servers fs.file-max set with 100000 sysctl -p | grep fs.file-max fs.file-max = 100000 from my understanding the file-max kernel parameter refers to open file descriptors, and file-...
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22 views

how to count the open files without lsof [closed]

we have in our cluster more then 800 rhel machines - version 7.2 since lsof | wc -l take too much time ( sometimes 3-4 min ) , in order to get the current open files we want to know if there are ...
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HDP cluster + data node machines + End of File Exception between local host is

we have small HDP cluster with 3 data-nodes machines HDP version is - 2.6.5 from the data-node machines we can see the following logs the main exception is about - java.io.EOFException: End of ...
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dmesg + UDP: bad checksum. + rhel 7.x

from the dmesg we get very strange lines as [6484420.812643] raid6: using avx2x2 recovery algorithm [6484420.859086] Btrfs loaded [6484426.278636] nr_pdflush_threads exported in /proc is scheduled ...
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19 views

Get error trying to feed SSL passphrase to apache

I've got scripts which restart apache so I've been trying to find a way to restart apache without it asking for the ssl passphrase as this means it won't restart in the script. The two solutions I ...
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17 views

How can I delete an OpenStack volume snapshot older than 10 days?

How can I delete an OpenStack volume snapshot older than 10 days? Below the playbook that I use to create the volume, but I want to implement also the deletion. --- - name: Creating a volume ...
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IPMI hangs while installing RHVH ISO in OVH dedicated server

I'm trying to install rhvh(Redhat-Virtulization) iso into ovh dedicated server using IPMI. Every time it gets hanged at pre-installation scripts. IPMI gets hanged at 0 FPS, it never responds, unless I ...
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1answer
19 views

Can't access Kibana remotely - Can curl successfully on machine

I've installed Kibana on rhel and am I'm trying to access remotely on http://server-url:5601. I've installed elasticsearch and am able to access that remotely on http://server-url:9200 I've added ...
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Anyone else unable to raise a Redhat support ticket? The portal is just hanging

I'm trying to raise a support ticket with redhat but the support system is just hanging: https://access.redhat.com/support/cases/#/case/new?intcmp=hp|a|a3|case& It's been like this for a few ...
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31 views

linux hang + kernel messages about failed to assign mem

we have 5 Linux rhel machines , we noticed that all machines was hang with the same time from messages file we can se the following Dec 29 19:54:25 localhost kernel: pci 0000:ff:12.4: BAR 4: failed ...
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1answer
38 views

RedHat 7.6, reboot cause applications listen on tcp6 sockets only

We have some vmware virtual machines with RHEL 7.6 installed, recently all of them got a reboot due data center move location. The problem is, after reboot some applicaiton, such as Java, kube-proxy ...
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1answer
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fsck on disk while Linux machine is up with runlevel N 5

we have linux machine , and we did the disk repair as the following umount /grid/sde fsck.ext4 /dev/sde e2fsck 1.42.9 (28-Dec-2013) /dev/sde: clean, 103867/1310720 files, 4725204/5242880 blocks this ...
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does RedHat EL6 uses systemd?

Does EL6 uses systemd? OS DETAILS here Linux version 2.6.32-642.11.1.el6.x86_64 (mockbuild@x86-027.build.eng.bos.redhat.com) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-17) (GCC) ) SMP Wed Oct 26 10:...
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Tomcat does not shut down correctly with init.d script on system-shutdown - restart prevented

I want to start Apache Tomcat 7 on my Redhat 7 server (RHEL7) automatically at system startup. In order to do that, I did the following steps: creation of the following init.d script and make it ...
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44 views

Replaced a RAID controller, now Red Hat won't start :(

I'm working with a client's HP ProLiant ML110 G7. At the beginning of the week, it wouldn't boot or POST at all. Over the course of the week, we've replaced the memory, motherboard, and power supply....
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115 views

PAM: password authentication failed for remote user

I am executing a command from server1 which would do a remote ssh to server2 and execute certain commands as olcne user. I am seeing some exception in /var/log/secure file wrt to pam. Can someone ...
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6 views

/dev/disk/by-path is missing

On a RHEL 7.6 system we use, there is no /dev/disk/by-path for a reason I don't know. Generating it manually doesn't seem like a good solution. I'm seeing records on /dev/disk/by-id though. Is this ...
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1answer
28 views

mailx does not run using crontab

I have a script which sends emails. It works perfectly when run manually but I doesn't work when run with crontab: #!/bin/bash cat $HOME/myfolder/mailbody | /bin/mailx -v -s "mymail" -a file.txt xxx....
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How can I merge several logical volumes into a new logical volume on another disk online? Bonus curveball, all the lv's are /var folders

I have two virtual disks sda and sdb on an rhel7 VM. My /var and /var/log folders are both constrained by the sizes of their initial provisioned logical volumes. sda is partitioned into an xfs ...
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1answer
69 views

Which firewall port required to access python repository?

Trying to install python library from corporate Server. Due to security reason the internet is blocked and specific URL's only allowed. So would like to raise a firewall opening to install python lib ...
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1answer
237 views

Why do I get an curl error while executing yum update

I'm working in a lab. There are many windows-PCs in this lab and I'm using one of them. There is also a proxy server, which allows all of PCs to be able to connect to the Internet. Now, I have a Red ...
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18 views

Check existing mounts against /etc/fstab and report missing mounts?

I've got an environment that I didn't build that was handed off to me and it's scheduled for the first round of updates. Unfortunately the client believes that some mount points may have been added ...
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1answer
42 views

Calico-node pods not becoming READY until iptables is disabled - Kubernetes on RHEL 7

I have provisioned a Kubernetes cluster on RHEL 7 and deployed Calico to it. The calic-node pods running on the master and worker nodes do not become ready until I SSH into the master and temporarily ...
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23 views

Strategies to compare between 2 virtual machines

I am writing a set of codes with Ansible/Terraform to deploy the same VM which I am already deploying using Bash scripts that interact with VMWare (vSphere 5.5) API. I have searched around how I ...
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1answer
54 views

Bootstrapping a Kubernetes cluster using Kubeadm on RHEL 7 - Issues with firewall

I'm trying to bootstrap a Kubernetes cluster on RHEL 7.8 but I'm having some issues with my firewall. nftables is not supported in Kubernetes and iptables-legacy must be installed instead. While the ...
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33 views

ntp.conf stepout adjustments

I’ve been reading over ntp documentation and I’m not quite sure I’m wrapping my head around ‘stepout’. We have a large environment of Linux VM’s that require ‘tinker panic 0’ to be set. ntp is ...
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33 views

While creating Virtual Machine storage selection is grayed out

I have created new free subscription and i am trying to create Red Hat linux virtual machine. While selecting storage i see all the sizes are grayed out and i am not able to select any storage. Can ...
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1answer
25 views

How can one identify what changes the SELinux file context of a file?

I'm noticing some files within a web directory with changed file contexts that deviates from system policy. There are developers that run git pull against at a higher part of the web directory and I'm ...
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1answer
20 views

SSH_AUTH_SOCK held by keyring

I'm running RHEL with xfce 4.14 on one of the work VMs $ cat /etc/redhat-release Red Hat Enterprise Linux release 8.1 (Ootpa) $ uname -a Linux foo.local 4.18.0-147.el8.sf02480468.12.x86_64 #1 SMP ...
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54 views

Apache Stops Suddenly

I have an Apache server that sometimes stops receiving requests until I restart then everything will be fine (I check the log, nothing there). Before restarting apache I run the command below, and ...
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1answer
83 views

Accidentally deleted openssl lib packages and can't get yum [duplicate]

Accidentally deleted openssl lib packages and can't get yum or wget to work again can anyone please help
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22 views

Cockpit drop connection when accessed from client in LAN

I have a recently installed Fedora box running at my local network. It has been configured just like my other Fedora box. However, I could not get Cockpit to work on this particular one. I am able ...
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12 views

How to mount an added volume to an instance and how to merge the disks together in OpenStack?

I have one volume in an instance created by OpenStack. | de917e5b-3214-4268-89ef-322a1a3568a0 | volume-myserver0-0 | in-use | 20 | Attached to myserver on /dev/vda | ...
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13 views

What happens if tmpfs reached the limit that defined in percentage

lets say we defined the following in /etc/fstab tmpfs /data tmpfs size=90% 0 0 And then we mount -a Now /data is with tmpfs What could be happens on the following scenario case that /data ...
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19 views

AZCOPY with FIPS on Linux

Azure azcopy v10 on RHEL7 was working until the server was made FIPS compliant. Researched Azure and found that is because the default implementation of MD5 is not FIPS compliant. This can be fixed ...
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2answers
40 views

repair file system by edit the fstab file

is it possible to run xfs repair by re-edit the fstab file? /dev/mapper/vg-linux_root / xfs defaults 0 0 UUID=7de1dc5c-b605-4a6f-bdf1-f1e869f6ffb9 /boot xfs ...
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1answer
36 views

How to resize RHEL Atomic logical partition?

We have a VM in AWS that is running Red Hat Enterprise Linux Atomic Host 7.7.3.1. AWS shows this EBS volume attached to it: And the size of the volume is 60 GB: I do not know who set up the VM or ...
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1answer
65 views

Get status of the master VRRP router Keepalived

I have two Linux routers (RHEL 7) participating in a redundant VRRP configuration provided by the keepalived package version 2.0.20. These two routers used to be running RHEL 6 and keepalived version ...

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