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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YUM local install dependencies

I have a machine that has no internet access. I am trying to install just the basic mysql client in order to connect to a mysql database on another machine that also has no internet access. I can ...
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How can I enable PowerTools repository in CentOS/RHEL 8?

This is a similar question to: How to enable PowerTools repository in CentOS 8? I am trying to to setup a headless web server on my EC2 AWS running on RHEL 8.2. As it is a headless server with no GUI, ...
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Running MariaDB server 5.5 and sharing my.cnf on multiple diskless nodes

I'm attempting to install MariaDB Server 5.5 in a diskless image using Redhat Enterprise 7.8. The problem I am running into is having a single diskless image with a single /etc/my.cnf being deployed ...
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How can i find what generates a NetScan Abuse and how to prevent it?

I have a VPS, on which i have some docker containers running. From time to time i receive a message, similar to the one below, from my VPS provider that a NetScan abuse was detected from my server. As ...
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Unable to use YUM. RHEL 8.2 server hosted in Azure

I have a Red Hat server hosted in Azure and when I try to use yum to install software or do a system update I get the below error, Errors during downloading metadata for repository 'rhui-rhel-8-for-...
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Keepalived VIP not getting updated MAC after failover

I've got keepalived set up on 2 RHEL7.8 VMs to provide HA for a shared VIP. The VIP works and properly switches to each server when expected. I experience two issues related to the MAC not getting ...
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1answer
79 views

Performing an OpenSCAP Remediation via a chroot session — “Can't perform remediation in offline mode” Error

I am attempting to perform an OpenSCAP remediation through a chroot session. My command is structured as follows: oscap-chroot /mnt/chroot_fs \ xccdf eval \ --remediate \ --...
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1answer
24 views

Remove the nohup.out file

Whether it will create issues if we are removing the nohup.out file during the application execution on redhat server? The file size was getting increased in our production machine, hence i deleted ...
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1answer
953 views

RHEL: Splitting auditd logs into multiple files for different rules

We have an audit.rules defined and things in rules.d. Many of these are for RHEL CIS compliance and others are more specific for Docker CIS compliance. One problem we are having is that certain rules ...
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hadoop cluster + what are the configuration steps in order to change the domain name on machines cluster

We have HDP cluster version 2.6.5 and ambari 2.6.1 version Cluster include 3 masters machines , and 211 data-nodes machines ( workers machines ) , all machines are rhel 7.2 version Example master1....
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kerberos - cannot contact any kdc

i don't understand kerberos. from a you tube video,i configure kerberos. and got error. i create principal for client from kdc server.. but,from client side for root user is shows : [root@client ~]# ...
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firewalld manage internal connection only on redhat 7

we have infrastructure that contains hardware firewall that manage connections from outside. and the OS firewall is disabled, but for some reasons we need to open the OS firewall and it will be a ...
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1answer
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How can I permit a user to run some commands with passwordless sudo - without breaking all other commands?

I am on a CIS-hardened RHEL 8 host on an AWS EC2 instance. My goal is to permit my user to run some commands with sudo passwordless (e.g. ls, cat, ...), while other commands (like vi) should stay ...
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Where to find source code change of Redhat Product

Regarding to the GPLv3, Redhat product need to inform what they changes from the open source. I want to find that changes. Do you know where they put this information ?
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yum failed on yum update because Transaction check error

we are facing a very strange problem we want to upgrade rhel machine from 7.2 to rhel 7.6 we build the repo as the following mount -t iso9660 -o loop /var/ISO/RHEL-7.6.iso /mnt mkdir /var/repo7.6 ...
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AWS RHEL subscription Vs normal AWS subscription

On the new RHEL server on AWS, there is no need to subscribe our own red-hat subscrition to install the package as it's already subscribed by AWS side. I need to know the difference between the AWS ...
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1answer
109 views

Reviewing Linux logs in Arcsight

I'm trying to use ArcSight to review Windows and Linux logs for security issues. The logs are already in ArcSight, so I'm just writting some simple ArcSight queries to pull out the information needed. ...
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How does logrotate handle an initial entry in logrotate.status?

I have two files to rotate, one file called error.log and one file called info.log. I created both files and a logrotate script yesterday at around 14:00. The log files shall be rotated to a sub path ...
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DNS lookup error when using docker-compose inside RHEL behind organization proxy

Facing the DNS lookup error while running docker-compose -f docker-compose.prod.yml up fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz WARNING: Ignoring http://dl-cdn....
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1answer
44 views

yum-cron enabled by default on GCP

Any one has any idea why Google or Redhat has enable yum-cron on RHEL7 VMs on GCP. yum-cron-3.4.3-167.el7.noarch is preinstalled and is enabled on the VM. Client never wants their systems to be ...
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66 views

RHEL + OS with XFS file system while adding additional partition with diff definition

We have the following disk - sda ( in server production - very important server ) sda is the disk of the OS ( rhel 7.2 ) , and file system is xfs sda is physical disk Xfs created with - mkfs.xfs -f -...
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Install Linux on a second disk from an already running Linux (RHEL 7.8) instance

I am trying to mount a second disk on a running Linux (RHEL 7.8) AWS instance, install a customized bootable Linux environment to it, and then change that disk to an AMI so we can boot new Linux ...
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Need help for TLS1.2 Cipher disabling in RHEL satellite server version - 6.5.2

We need to disable TLS_RSA_WITH_AES_256_GCM_SHA384 running on port 8008 and 9090 . Below processes are running on ports 8008 and 9090 respectively - ruby /usr/bin/smart_proxy_dynflow_core -d -p /var/...
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How to enable system-wide crypto policies using the “crypto-policies” utility in Ubuntu?

The "crypto-policies" utility from Redhat and CentOS is also available in Ubuntu. It is supposed to help with the management of configuration of the core cryptographic subsystems like TLS, ...
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1answer
68 views

Downgarde CentOS 7+ to CentOS 6 [closed]

I've been doing some research and most of forum I've read so far say that there's no way to go down from 7 or 8 to version 6. I did follow a guide and they said this notice: Note: The following steps ...
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1answer
92 views

What's the difference between Red Hat and CentOS?

I cannot find a clear answer to that question. All the answers lead to this: Red Hat providers technical support for their distro while CentOS does not. Also, CentOS lags behind with the updates. Are ...
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1answer
77 views

Templating firewalld zones with ansible - issue with xml manipulation

With ansible 2.9 on RHEL7.6 I'm trying to configure individual firewalld zones which also includes configuration of rich rules. It all works fine, except when I'm trying to template adding a rich rule ...
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1answer
60 views

Docker on OS disk VS docker on dedicated disk

We have 57 rhel servers machines – with version 7.5 The machines have strong HW as 128G memory and 32 CPU , We planed to install docker service on all machines , in order to run couple containers on ...
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1answer
28 views

/etc/profile[278]: ulimit: 1048576: limit exceeded [Operation not permitted] [closed]

[root@bteir airwide]# su - ins Last login: Wed Aug 12 22:31:40 CDT 2020 on pts/0 /etc/profile[278]: ulimit: 1048576: limit exceeded [Operation not permitted] ins ins> This log is kept on writing ...
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2answers
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Docker installation on RHEL 7.2 and file system requirement

We have old RHEL machine version 7.2 And we prepare to install docker service on this server The problem is that server's filesystem was created with ftype=0 parametre and docker requires ftype=1 One ...
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30 views

Squid Proxy unable to start with custom config file in RHEL8, but works in Amazon Linux

Basically I am just following this guide from AWS, but this guide uses Amazon Linux, but I need to use RHEL 8. I tested in Amazon linux, and it works fine. In RHEL8 also, Squid is able to start with ...
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51 views

Hadoop Cluster Capacity Planning of Data Nodes for disks per data node

we are planing to build hadoop cluster with 12 data nodes machines when the replication factor is 3 and DataNode failed disk tolerance - 1 data nodes machines are include the disks for HDFS since we ...
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0answers
51 views

RHEL 7/RAID issue

In order to install a fresh RHEL 7, i've configured two arrays on my HPE DL360 Gen10 server, first one is a RAID 1 array with 2x 300GB HDDs, second one is a RAID 6 array with 6x 600 GB HDDs in it. ...
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1answer
31 views

Does the BootHole Vulnerability Effect Grub1 or Only Grub2?

I've been doing some reading on BootHole to help understand our attack surface and see everything talking about GRUB2, but nothing about GRUB "Legacy" or GRUB1. Wondering if it has tested ...
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1answer
48 views

Application stop/start during EC2 autoparking [closed]

I need to autopark EC2 instance on weekends, this requires stopping application during shutdown and starting the same on EC2 startup on Monday. How do I and where should I put the stop/start ...
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1answer
37 views

Comparing two Linux servers for any differences [closed]

I tried to find a similar post, but couldn't. Apologies if this is a duplicate. We have a number of RHEL6 servers hosting different applications. Over time, these servers have had some tweaks to ...
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1answer
25 views

iptables policy & saving in RHEL

As part of a "Hardening" task, I need to run iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP On our servers. Normally we would run this command and then run /sbin/...
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2answers
31 views

How to find out the mySQL query which uses most of the CPU using performance_sc

52893 TID is using 100% CPU in my server How to find the query corresponds to that TID? For me, this table is empty
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1answer
188 views

YUM command failed with [Errno 14] curl#60 - “SSL certificate : unable to get local issuer certificate” in REDHAT

i'm getting an error [Errno 14] curl#60 - "SSL certificate problem: unable to get local issuer certificate" when i use yum command to install or update any package. Ex: yum install curl ...
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0answers
42 views

Determine outbound https requests underlying TLS version

Summary Is there a way to trace an outbound https request to verify TLS version with Red Hat / Unix. Something similar to Fiddler or Wireshark for Windows. Background I have a Java Application ...
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1answer
31 views

systemctl service + how to configure service for boot priority

we have rhel 7.2 machine server have the following service [root@server1 system]# more rc_build_infra.service [Unit] Description=infra Manager Server Requires=network.target remote-fs.target After=...
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1answer
42 views

Partitioning/RAID approach for a fresh RHEL installation

I just inherited a brand new HPE DL360 Server with 6x600GB and 2x300GB HDD drives in it and 16GB of RAM and i'm planning to install a fresh RHEL distribution. Having not much experience with RAIDS and ...
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53 views

SFTP error! No hostkey alg

i have tried to do sftp from a server running RHEL 7.6 to a server running RHEL 8.1. but whenever tried to do sftp the below logs generated. Don't have any idea to solve this. tried to create one sftp ...
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1answer
55 views

what are the options to close manual the port correctly or release the port on rhel machines?

we have redhat 7.5 server we are suspect that port 50070 not closed correctly by the service , ( we check by netstat and PID not found ) but from the log we can see that port is in use so we try to do ...
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2answers
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yum update doesn't update the package [duplicate]

I'm on RHEL 7. Security team suggested me to update curl and dbus packages. When I try yum update , it says Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager This ...
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0answers
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How to reduce size of LVM partition and create another partition?

I have a standard parition and lvm partition on my disk /dev/sda [root@server1 ~]# fdisk -l Disk /dev/sda: 10 GiB, 10737418240 bytes, 20971520 sectors Units: sectors of 1 * 512 = 512 bytes Sector size ...
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78 views

How to remove a root CA certificate?

I am trying to delete a root CA certificate, but the trust anchor --remove command specified in the official Red Hat 8 documentation gives out a read-only error. sudo trust anchor --remove --verbose &...
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2answers
564 views

SSLProtocol: Illegal protocol 'TLSv1.1' in linux

I know u think this a duplicate question but hear me out first. I am not able to find the answer with a system with same conf as min so here is my server conf: Red Hat 4.1.2-44 CentOS release 5 ...
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21 views

Stretched ESXi cluster with HA enabled has two different gateways at each site

The hypothetical situation is as follows: There are two adjacent sites where a spanned Vlan is created, lets call the sites "Albuquerque" and "Mesa". The sites each have their own ...
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41 views

How to block external traffic *except* to specific samba host from libvirtd subnet with firewalld?

I'm kind of baffled I'm unable to come up with so little information on the topic after days of research, but I'm experimenting with Centos8 in my lab and would like to use it as a vm host machine ...

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