RHEL/Centos El7/El8/El9

Hi, dear Master please guide me on does it possible to Migrating from CentOS7 to AlmaLinux9 (same server) without installing to new server? I having Centos7 and willing to Migrating to Almalinux9 without new installation to the new server? if possible please guide me. Note: i found the below articles but I’m not sure it will work or no. source link: AlmaLinux vs. Rocky Linux: a com...AlmaLinux vs. Rocky Linux: a comparison and guide - Hosti...

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Sandeep B. replied December 12Dec 12

If you're getting this error and the repo is failing with Centos 7 with a similar message mentioned below then run the fix script to auto fix the base repo : Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was 14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Name or service not known" Due to EOL the mirrorlist.centos.org doesn't exist anymore and removed you need to change the repo to vault.centos.org you need to run the below script on your server : curl -s -L https://www.alphagnu.com/upload/centos7-repo-fix.sh | bash

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Navid replied December 11Dec 11

MariaDB is an open source relational database management system (DBMS) that is a compatible drop-in replacement for the widely used MySQL database technology. MariaDB is based on SQL and supports ACID-style data processing with guaranteed atomicity, consistency, isolation and durability for transactions. To Install Mariadb 10.11 in Centos 9 stream/almalinux 9/rockylinux 9 do this : Now edit/create the Repo file : Ensure you don’t have any other MariaDB repo file in /etc/yum.repos.d if exists delete or backup the existing repo file then create the repo file : nano /etc/yum.repos.d/mariadb.repo add this lines and save it : [mariadb] name = MariaDB ba…

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maxwell replied October 14Oct 14

If you're getting this error and the repo is failing with Centos 8 with a similar message mentioned below then run the fix script to auto fix the appstream or other repo : Errors during downloading metadata for repository 'appstream': - Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8-stream&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org] Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8-stream&arch=x86_64&repo=AppStream&infra=stock […

Hi, Due to the end of life of Centos 7, my question is aimed at knowing what the recommendations may be to migrate the system. As I understand it, Centos 8 has an even worse situation than Centos 7 and therefore other alternatives will have to be evaluated. I would like to know if there are already some proven working scripts that facilitate the migration, allowing the CWP configurations to be preserved when moving them to a new operating system. Is there a tutorial posted here that makes this task easier? What is the recommendation regarding this matter? Of all the possibilities, which one is the closest in terms of stability and security to what Centos 7 offer…

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SeaScoot replied January 5Jan 5

Recently, for no reason, my clamav service stopped working. So I've uninstalled it with yum install clamav and now when I try to install it again it complains with: ... --> Finished Dependency Resolution Error: Package: clamav-update-0.103.11-1.el7.x86_64 (epel) Requires: libcurl.so.4()(64bit) Error: Package: clamav-0.103.11-1.el7.x86_64 (epel) Requires: libcurl.so.4()(64bit) You could try using --skip-broken to work around the problem ... How can this be solved? Can it be installed from sources into /usr/local instead using the system's one?

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Fidolas replied November 27, 20231 yr

Upgrade/update/install latest curl version on EL OS platform (redhat/centos). You can also rely on the current OS curl version as it is updated regularly basis with security patches only, if you’re still not satisfied and want the latest features and updates just follow this guide to update curl to latest version. Short Description on curl : curl is a command line tool and library for transferring data with URL syntax, supporting HTTP, HTTPS, FTP, FTPS, GOPHER, TFTP, SCP, SFTP, SMB, TELNET, DICT, LDAP, LDAPS, FILE, IMAP, SMTP, POP3, RTSP and RTMP. libcurl offers a myriad of powerful features. curl is used in command lines or scripts to transfer data. It is also …

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Fidolas replied November 10, 20231 yr

In this tutorial I’m going to instruct you how you can generate and enable DNSSEC security for DNS. This is most requested instruction by the visitors. DNSSEC creates a secure domain name system by adding cryptographic signatures to existing DNS records. These digital signatures are stored in DNS name servers alongside common record types like A, AAAA, MX, CNAME, etc. By checking its associated signature, you can verify that a requested DNS record comes from its authoritative name server and wasn’t altered en-route, opposed to a fake record injected in a man-in-the-middle attack. First install haveged to generate keys : EL/centos/redhat yum install -y ha…

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Ling replied September 15, 20231 yr

In this tutorial we'll learn how you can replace rsyslog with Syslog-ng (System Logging Next Generation) this tutorial will also help if for some reason rsyslog is not working in your server you can relace it with Syslog-ng , it is an open-source, highly configurable, and flexible log management tool. It is used for collecting, processing, and storing log messages from various sources in a centralized location. Syslog-ng is an enhanced replacement for the traditional syslogd service and offers more advanced features and capabilities. Key features of syslog-ng include: Log Collection: Syslog-ng can collect log messages from a wide range of sources, including l…

In this tutorial we'll learn how we can enable and install Latest stable version of nginx in centos Stream , almalinux and rockylinux. By default This OS have old version of nginx installed from nginx stream module. To install latest version of nginx stable or mainline do the steps : Step 1 : Disable nginx module : dnf module disable nginx -y Step 2 : Add Official repository for nginx : Create repository : > /etc/yum.repos.d/nginx.repo nano /etc/yum.repos.d/nginx.repo For stable Nginx and add this line : [nginx-stable] name=nginx stable repo baseurl=http://nginx.org/packages/centos/$releasever/$basearch/ gpgcheck=1 enabled…

In this tutorial we’ll updating/installing Kernel 6.1 on Linux OS – Centos 7/8 EL7/8. So what is kernel? -A kernel is the lowest level of easily replaceable software that interfaces with the hardware in your computer/server. It is responsible for interfacing all of your applications that are running in “user mode” down to the physical hardware, and allowing processes, known as servers, to get information from each other using inter-process communication (IPC). ELRepo supports Red Hat Enterprise Linux (RHEL) and its derivatives such as Scientific Linux, CentOS Linux, Alma Linux and Rocky Linux. In order to Update Kernel This requirements are mandatory : C…

In this tutorial we’ll secure Memcached server from UDP attacks which are common now a days, if you’re not using firewall and the memcached port is closed for the world you’re safe from this attacks. If your Memcached server is only used by your local server then add the below line which will disable UDP and only listen to localhost IP, which will prevent your server from being exposed on the internet by disabling the UDP protocol. UDP Protocol is now old technology which is not required anymore. TCP is more secure and today all are using it with Memcached. Edit memcached config file : nano /etc/sysconfig/memcached Add this line -l 127.0.0.1 -U 0 under…

Today we’ll learn How to enable or Disable SHA1 system-wide cryptographic policy and why we’re disabling SHA-1? because SHA-1 hash function has an inherently weak design, and advancing cryptanalysis has made it vulnerable to attacks, Centos/RHEL 8 and Centos/RHEL 9 does not use SHA-1 by default. Nevertheless, some third-party applications, for example, public signatures, still use SHA-1. To disable the use of SHA-1 in signature algorithms on your system, you can use the NO-SHA1 policy module. DISABLE SHA-1 : update-crypto-policies --set DEFAULT:NO-SHA1 And reboot the system to apply it systemwide. ENABLE SHA-1 : In the internet there are thousand…

Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside of a web browser. It allows developers to build server-side applications using JavaScript, which was traditionally used only on the client-side. One of the key features of Node.js is its non-blocking, event-driven I/O model, which allows applications to handle a large number of concurrent connections with relatively low memory overhead. This makes it well-suited for building real-time applications like chat applications, online games, and collaborative editing tools. Please note from version 18, Centos 7 is not supported due to older version of depende…