Questions tagged [rhel]

Red Hat Enterprise Linux (RHEL) is a commercially supported Linux distribution.

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postfix lost connection after STARTTLS from unknown

I am trying to build a email server using RHEL 8 which will receive mail from its client servers. When i try to send a mail from the client server i am getting the following error message under ...
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2answers
39 views

Is their anyway to get TLS 1.3 on Nginx without building from source

Currently running NGINX on redhat 7.7 production webserver, I think I know the answer but I wanted to double check. The issue is I'm trying to get TLS1.3 working. Below is part of my conf. ...
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53 views

Automate a domain join on linux

I'm new to Linux and searched the whole day on how to automate a domain join and i didn't find anything. This is the code i came up with. realm join domain.com --user=exampleuser echo "password" I ...
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1answer
129 views

How to create sub-directories without HTTP or HTTPS from string parameter

I have ksh script, which is running the below command: mkdir -p down/$JENKINS_URL the thing is that some $JENKINS_URL (string) includes HTTP:// and in some HTTPS://, which is causing the creation of ...
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+50

Lost network connectivity to KVM guest vm's on host Network Restart

I just restarted the network services in KVM host and running vm guest's network were not reachable. I enabled network to vm guest's through Bridge. Only after guest reboot I could access the vm IP's....
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26 views

What are the CentOS/RHEL 8 equivalents of libgssglue and openjpeg-libs?

What are the CentOS/RHEL 8 equivalents(or name of the package which they were merged into) of libgssglue and openjpeg-libs, if any(are their functions now unsupported)? I'd greatly appreciate the ...
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1answer
40 views

Install gcc 6.2.0 on RHEL6

I have an RHEL 6 server with gcc version 4.4.7. I wanted to update the gcc version to 6.2.0 . Yum update doesn't work. Also, SO answers for a similar question on does not work. Has anyone updated ...
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1answer
21 views

How to instal yum on Red Hat Enterprise Linux Workstation release 6.7 (Santiago)?

I am trying to install some packages using yum but yum is not installed $ yum install There was a problem importing one of the Python modules required to run yum. The error leading to this problem ...
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10 views

Which file to set isolcpus on CentOS 7?

I am using CentOS 7 and would like to isolate cores 0 and 1 for the OS/Kernel, meaning nothing will be scheduled on my other cores. I need isolcpus After some Googling I found this: https://access....
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RedHat Linux 7.6 Coreparking and MySQL breaking mySQL

Has anyone had any issues with MySQL and Core Parking CPU's on RHEL 7 I inherited a number API gateway clusters with MySQL 5.6.? running on them. We use a script that fails over the clusters to a ...
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25 views

Hostname overrided after Reboot even after making entry in /etc/hostname

I have cloned a KVM vm from one host to other host, I tried to rename the hostname and it's been renamed. But after reboot still it goes to old name. hostnamectl command output Static hostname: ...
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Black screen with cursor after attempting updates RHEL 7.0

I am a building automation software engineer and have been tasked with testing one of our programming tools on a Linux installation. After reading documentation, the program will only run on Red Hat 7....
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23 views

How to store value of sqlcmd query into variable in shell scripting

I tried to store the value of my sqlcmd query into variable and display the output. For example cwdusers=$(sqlcmd -S "mydb" -U xxx -P xxxxx -d My_DB -Q "select count(*) from user_table") echo "Total ...
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63 views

Yum broken on RHEL 7; “[Errno 12] Timeout on …” repository

Issue and symptoms: [root@XXX ~]# yum install python-pip Loaded plugins: enabled_repos_upload, langpacks, package_upload, product-id, search-disabled-repos, subscription-manager epel/x86_64/metalink ...
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1answer
24 views

What happens if a RHEL activation key (by mistake) is used multiple times?

According to some support page of Red Hat, it is possible to streamline system registration and subscription attachment of one (?or several) system(s) using activation keys. Indeed I have a setup in ...
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24 views

JVM memory + dose heap size Xmx values have impact on consuming memory

we have linux redhat machines with service ( service is based on java ) for now service consume 1.5G memory , and the heap size set to Xmx2G let say we increase the heap size to Xmx10G dose this ...
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2answers
52 views

What determines an interface's promiscuity, the interface flags or properties?

I was running a scan with Lynis on a RHEL 7 box and it said that an interface was in promiscuous mode. I checked and determined that the links were not based on not having the Promuscuous flag (only ...
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35 views

How do I find what program is sending an email from a linux server

We have inherited a RHEL server and it is continually trying to send e-mails to defunct email aliases. Is there any way of finding out what program is sending the emails?
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1answer
26 views

Moving a Compile/Make project from old RedHat 5 (CentOS) to modern Ubuntu/Mint

So I have a little learning project that I am currently working on. I have a project/program that is compiled up from multiple *.cpp *.hpp etc files. This project (actual bin-executable) is built ...
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2answers
31 views

How to upgrade ruby in RHEL

How to upgrade ruby to a new version in RHEL. When I try - sudo yum install ruby It says Package ruby-2.0.0.648-33.el7_4.x86_64 already installed and latest version Nothing to do When I ...
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58 views

runlevel + what is runlevel 5 3 in redhat linux

we know that runlevl of multi user mode is N 5 but on our redhat 7.2 we get the following runlevel 5 3 what is the meaning of this run-level ? how to change this machine to multi user mode ( ...
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74 views

What does this error mean? AH01215: Schema .myuser@mydb. Password .mypass [closed]

I'm trying to deploy a page called 'Create' on my Redhat 7 linux web server using Apache. When I try to reach my page, I get the following error message from my error log: [cgi:error] [pid 23367:tid ...
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37 views

MTU 9000 and 1500 when machines with MTU 1500 send data to machines with MTU 9000

we have some machines in the cluster linux machines as Linux_a , linux_b are configured with MTU 1500 while linux machines - linux_1 and linux_2 are configured with MTU 9000 so linux machines - ...
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1answer
43 views

Redhat 6- Normal user cannot resolve hostname through proxy but root can

I have a linux server (in Nutanix) where normal user cannot resolve hostname through proxy but root can, below is the result: backup user: [backup@~]$ curl --insecure --url "https://outlook....
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65 views

Trouble launching Red Hat(7.7) Subscription-Manager

My system config: Red Hat 7.7 [Developer's edition]. Stand Alone system. root@thinkred1cartoon:$ cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.7 (Maipo) root@thinkred1cartoon:$ ...
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1answer
233 views

How to install Terminator in Rhel8?

I am not able to install Terminator in Rhel 8. I do not want to install it using "snap". The process that used to work in Rhel 7 does not work in Rhel8.
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1answer
105 views

Redhat 7.5 unable to install pyarrow

ERROR: Could not build wheels for pyarrow which use PEP 517 and cannot be installed directly When executing the below command: ( I get the following error) sudo /usr/local/bin/pip3 install pyarrow ...
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1answer
58 views

ssh-keygen and its -Z option on OpenBSD and on RHEL

I'm following along a rather good text about SSH certificates written for RHEL 6 and openssh-5.3p1-94.el6 (which makes it about 10 years old) while trying to mimic the examples on my OpenBSD-current ...
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1answer
68 views

problem sftp connection with rsa keys

I am on RHEL 6. I have a user Jack which doesn't have shell access but SFTP. With my own user, I have created an RSA key pair with ssh-keygen command for jack (the user). I have created .ssh folder ...
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34 views

Opening and closing round brackets give continuous 0s or 9s in terminal without further keypress

I have got assigned a new virtual machine at my company. The issue I am facing is when I type ( or ) it prints 9 or 0 continuously after the bracket till we interrupt it. I couldn't find what ...
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3answers
301 views

Replace third word in double quotes from file

This is the json file that we want to edit Example 1 { "topics": [{"topic": "hfgt_kejd_tdsfd”}], "version": 1 } Example 2 { "topics": [{"topic": "hfgt_kj_fsrfdfd”}], "version": 1 } We ...
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1answer
42 views

increase maximum number of open files (ulimit)

I need to increase the files limit on my system (for running on large files in Spark). The release of linux on my server is: Redhat Release: Red Hat Enterprise Linux Server release 7.6 (Maipo) I ...
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9 views

resizing vncserver and xrandr in RHEL 6

vncserver -screen scrn 1920x1080x32 this works for me in RHEL 7.6, as well as SLES 11.4 I am running a separate system on RHEL 6.9 which has had security settings already applied [manipulated] by ...
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24 views

What could make a server going offline every 24hrs?

I have 8 servers, spread across two subnets (two separate switches), that all exhibit a maximum 24hr uptime. These are diskless machines mounting their filesystem from an NFS server. They go offline ...
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1answer
13 views

FvwmCommand WindowList - get layer information

I'm trying to get information about running windows with all the information that is shown in the menu of "FvwmCommand WindowList" output. (Redhat Linux 7) The problem with this command is that it ...
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1answer
40 views

Haproxy seems to not send logs to 127.0.0.1:514 despite configuration

Edit: the actual problem ended up being either the local0 vs local2 distinction and the rsyslog end of deal. I'm building a kubernetes / openshift cluster, and on front of that, I need to set up a L4 ...
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13 views

How Can I Safely Move /var to a New Disk or Partition [duplicate]

I'm working with a client that has their own VM images of RHEL 7 that they want to use for a project. Unfortunately, all of / is only 50GB. I asked for /var to be 300GB but all they did was mount a ...
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1answer
29 views

Can't locate IO/Pty.pm - but it is installed

I have a script that I inherited from another developer and am trying to make it work on a new RHEL server. The script uses Expect.pm which 'uses' IO/Pty (and IO/Tty). The issue is, when I run this ...
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27 views

Whitelist sender SMTP Server in Postfix header_checks

I'm trying to whitelist a SMTP server in my postfix header_checks configuration file. To prevent Phishing mails we reject all external mails to our internal network with our company domain as e-mail ...
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1answer
27 views

The output of “yum updateinfo” and “yum check-update” is not the same

Why I am getting an empty list when running yum updateinfo: $ yum updateinfo Loaded plugins: fastestmirror, ovl Loading mirror speeds from cached hostfile * base: centos.mirror.ate.info * epel: ...
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1answer
28 views

How to print top 5 biggest repositories of Bitbucket

I'm trying to write a shell script which will print the top 5 biggest repositories of Bitbucket and will present the Project name, Reposotry name, and its size. repository config file example: [...
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1answer
41 views

Cannot disable SELinux by modifying the config file and rebooting

I'm trying to disable SELinux on a virtual environment (because a software component we use recommends it, not because I want to) I have tried setting its status to "disabled" in /etc/selinux/config ...
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19 views

Using named pipes within ksh-script for write and read

I'm porting some ksh scripts from Solaris 10 (ksh-Version M-11/16/88i) to RedHat 7.x Linux (ksh-Version AJM 93u+ 2012-08-01) and have some difficulties with inter-process communication. Normally there ...
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33 views

Remote ssh logins [duplicate]

I was surprised to see that I'm receiving lots of ssh intruders from different IP locations. Also in my server 90% of CPU is being utilized in running cron /tmp/.txl/upd >/dev/null 2>&1 ...
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1answer
22 views

Install R on rhel 6

Am getting below error when I do ./configure -with-x=no checking whether zlib support suffices... configure: error: zlib library and headers are required Installation Steps which I follow sudo ...
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24 views

How do I run linux functions from file

Newbie Linux question. Trying to install MISP from this github page. In the instructions there are lines that read #. For example, # <snippet-begin 0_RHEL_EPEL.sh> enableEPEL () { sudo yum ...
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9 views

Finding reason for reboot RHEL 7

I have RHEL 7 machine running workloads. The machine is provisioned in AWS of instance c5. During workload the process got killed and the machine shutdowns. I need to analysed why the machine got ...
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0answers
31 views

Why some Active Directory domain users can't connect to the server?

I've been experiencing an issue with a RHEL 7 Server in which relatively newly created Active Directory domain users can't connect to the server. When I try to login with users which were created ...
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1answer
25 views

Library stability across different major and minor versions

I'm building a shared library from my C++ code on RHEL A.B (Major version is A and minor version is B). In how many of the below scenarios this shared library is guaranteed to work in a stable, ...
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2answers
233 views

What does the word “rolling” mean in a rpm package version context?

What does the word "rolling" in "1:13.0.1.9-2.rolling.el7" below signify? ================================================================================================= Package ...