How To Install LAMP Stack In Fedora 23

November 6, 2015, 4:56 am

≫ Next: How To Install LEMP Stack On Fedora 23

≪ Previous: Fedora 23 Is Out! Upgrade To Fedora 23 From Fedora 22

LAMP is a combination of operating system and open-source software stack. The acronym LAMP comes from the first letters of Linux, Apache HTTP Server, MySQL/MariaDB database, and PHP, Perl or Python.

In this tutorial, let us see how to install LAMP stack in Fedora 23 server. Although, the same procedure will work Fedora 22 and earlier versions.

My testbox hostname and IP address are server.unixmen.local and 192.168.1.102/24 respectively. Well, let us start to deploy the LAMP stack now.

Install Apache

Apache is an open-source, multi-platform web server. It provides a full range of web server features including CGI, SSL and virtual domains.

Change to root user using the following command:

su

Enter the following command to install Apache:

In Fedora 23/22:

dnf install httpd -y

In Fedora 21 and earlier versions:

yum install httpd -y

Enable the httpd service to start automatically on every reboot:

systemctl enable httpd

Start httpd service using the following command:

systemctl start httpd

If you are encountered with the following error:

Job for httpd.service failed. See 'systemctl status httpd.service' and 'journalctl -xn' for details.

Delete all contents in your /etc/hostname file and add the word “localhost”. Also set “localhost“ to the “Servername” value in/etc/httpd/conf/httpd.conf file and try again to start httpd service.

And adjust the firewall to allow the httpd service to access it from remote clients.

firewall-cmd --permanent --add-service=http

firewall-cmd --permanent --add-service=https

Restart firewalld service:

firewall-cmd --reload

Test Apache:

Open up your browser and enter http://ip-address/ in the address bar. You will see the following Apache default page.

If you see the above output, then Congratulations! Apache is working!

Install MariaDB

MariaDB is a drop in replacement for MySQL. It is a robust, scalable and reliable SQL server that comes rich set of enhancements. The default database in Fedora 19 is MariaDB.

Install it using the following command:

In Fedora 23/22:

dnf install mariadb mariadb-server -y

In Fedora 21 and earlier versions:

yum install mariadb mariadb-server -y

Enable mariadb service at boot time with following command:

systemctl enable mariadb

And start mariadb service using command:

systemctl start mariadb

Set MariaDB root password:

By default mysql root user password is empty. So, to prevent unauthorized access to mysql databases, let us set a root user password:

mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

You already have a root password set, so you can safely answer 'n'.

Change the root password? [Y/n] y     ## Enter 'y' and press enter ##
New password:               ## Enter password ##
Re-enter new password:      ## Re-enter password ##
Password updated successfully!
Reloading privilege tables..
 ... Success!

By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n]    ## Press Enter ##
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] ## Press Enter ##
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] ## Press Enter ##
 - Dropping test database...
ERROR 1008 (HY000) at line 1: Can't drop database 'test'; database doesn't exist
 ... Failed!  Not critical, keep moving...
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] ## Press Enter ##
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

Install PHP

PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely used open-source general purpose scripting language that is especially suited for web development and can be embedded into HTML.

Install PHP with following command:

In Fedora 23/22:

dnf install php -y

In Fedora 21 and earlier versions:

yum install php -y

Test PHP:

Create a sample “testphp.php” file in Apache document root folder and append the lines as shown below:

vi /var/www/html/testphp.php

Add the following lines:

<?php
phpinfo();
?>

Restart httpd service:

systemctl restart httpd

Now, navigate to http://server-ip-address/testphp.php. It will display all the details about PHP such as version, build date and commands etc.

Install PHP Modules:

Search for the available PHP modules using the following command:

In Fedora 23/22:

dnf search php

In Fedora 21 and earlier versions:

yum search php

Now install the required module of your choice, for example php-mysql, using the following command:

In Fedora 23/22:

dnf install php-mysql -y

In Fedora 21 and earlier versions:

yum install php-mysql -y

Restart the httpd service.

systemctl restart httpd

To verify the modules, open your web browser and navigate to http://server-ip-address/testphp.php. You will able to see the installed PHP modules.

As you see in the above screenshot, php-mysql module has been installed and activated.

Install phpMyAdmin

phpMyAdmin is a tool that can be used to manage mysql databases via web browser. This step is optional. If you’re advanced user, you can mange mysql databases from the command line.

phpMyAdmin is available in the default repositories. So, you can install it using command:

In Fedora 23/22:

dnf install phpmyadmin -y

In Fedora 21 and earlier versions:

yum install phpmyadmin -y

Configure phpMyAdmin:

By default, phpMyAdmin can be accessed only form the localhost. To access it from a remote system in your network, do the following steps.

Edit file /etc/httpd/conf.d/phpMyAdmin.conf,

vi /etc/httpd/conf.d/phpMyAdmin.conf

Find and comment out Require ip 127.0.0.1 and Require ip ::1 lines. And then add one extra line Require all granted just below to commented lines.

This is how my phpMyAdmin.conf file looked after the changes made. The changes are shown in bold letters.

[...]

Alias /phpMyAdmin /usr/share/phpMyAdmin
Alias /phpmyadmin /usr/share/phpMyAdmin

<Directory /usr/share/phpMyAdmin/>
   AddDefaultCharset UTF-8

   <IfModule mod_authz_core.c>
     # Apache 2.4
     <RequireAny>
#       Require ip 127.0.0.1
#       Require ip ::1
        Require all granted
     </RequireAny>
   </IfModule>
   <IfModule !mod_authz_core.c>
     # Apache 2.2
     Order Deny,Allow
     Deny from All
     Allow from 127.0.0.1
     Allow from ::1
   </IfModule>
</Directory>

<Directory /usr/share/phpMyAdmin/setup/>
   <IfModule mod_authz_core.c>
     # Apache 2.4
     <RequireAny>
#       Require ip 127.0.0.1
#       Require ip ::1
        Require all granted
     </RequireAny>
   </IfModule>
   <IfModule !mod_authz_core.c>
[...]

Important: But allowing phpMyAdmin to anyone other than localhost should be considered dangerous unless properly secured by SSL. Do this at your own risk.

Save and close the file. Restart httpd service.

systemctl restart httpd

Test phpMyAdmin:

Open up your web browser and navigate to http://ip-address/phpmyadmin URL. You should see the following like screen. Enter the mariadb root user name and password to access the phpmyadmin dashboard.

Here it is how my phpMyAdmin Dashboard looks like.

From here, you can create, delete or modify databases easily than from the command line.

That’s it. Start using LAMP stack on Fedora 23.

The post How To Install LAMP Stack In Fedora 23 appeared first on Unixmen.

↧

How To Install LEMP Stack On Fedora 23

November 9, 2015, 4:09 am

≫ Next: How To Install Linux Kernel 4.3.0

≪ Previous: How To Install LAMP Stack In Fedora 23

LEMP is a combination of the operating system and open-source software stack. The acronym LEMP is derived from the first letters of Linux, Nginx HTTP Server, MySQL/MariaDB database, and PHP, Perl or Python.

In this tutorial we will see how to install LEMP stack on Fedora 23 server. The same procedure should work on previous Fedora versions.

My testbox hostname and IP address are server.unixmen.local and 192.168.1.102/24 respectively.

Well, let us start to deploy the LEMP stack now.

Install Nginx

Nginx (pronounced engine-x) is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server written by Igor Sysoev.

First login as root user to perform the installation:

su

Note: If you have installed apache or any other web servers before, remove or disable them.

systemctl disable httpd.service

systemctl stop httpd.service

To install Nginx enter the following command in your terminal:

In Fedora 23/22:

dnf install nginx

In Fedora 21 and earlier versions:

yum install nginx

Enable Nginx service to start automatically on every reboot:

systemctl enable nginx.service

Start Nginx service using the command:

systemctl start nginx.service

Adjust the firewall to allow the httpd service to access it from remote clients.

firewall-cmd --permanent --add-service=http

firewall-cmd --permanent --add-service=https

Restart firewalld service:

firewall-cmd --reload

Test Nginx:

Open up your web browser and navigate to http://ip-address/ or http://localhost/. You will see a screen something like below.

Configure Nginx:

Open the file /etc/nginx/nginx.conf in any editor:

vi /etc/nginx/nginx.conf

Set the worker_processes (i.e No. Of CPU’s in your system) or leave it as default. To see the no. Of CPU’s, use the command“lscpu”. In my case, it’s “1″. So I set this as ’1′:

worker_processes 1;

Scroll down further in this configuration file and set the server name and PHP scripts. The changes are shown in bold.

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  server.unixmen.local;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location / {
        }
## Add the following lines ##  
  
    location ~ \.php$ {
              root           /usr/share/nginx/html;
              try_files $uri =404;
              fastcgi_split_path_info ^(.+\.php)(/.+)$;
              fastcgi_pass   127.0.0.1:9000;
              fastcgi_index  index.php;
              fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
              include        fastcgi_params;
    }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }
}

Save and close the file.

Test nginx configuration:

Test the nginx configuration for any syntax errors using command:

nginx -t

Sample output:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

Restart nginx service.

systemctl restart nginx.service

Install MariaDB

MariaDB is a drop in replacement for MySQL. It is a robust, scalable and reliable SQL server that comes rich set of enhancements.

Now, start installing MariaDB as shown below:

In Fedora 23/22:

dnf install mariadb-server mariadb

In Fedora 21 and earlier versions:

yum install mariadb-server mariadb

Start MariaDB service and let it to start automatically on every reboot:

systemctl start mariadb.service

systemctl enable mariadb.service

Setup Database root password:

By default, MySQL root password is empty. So, to prevent unauthorized access to MySQL, let us set root user password. Enter the following command to setup mysql root user password:

mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

Set root password? [Y/n] y ## Enter Y and press Enter
New password:   ## Enter new password
Re-enter new password:  ## Enter password again
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y  ## Enter Y and press Enter
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] y  ## Enter Y and press Enter
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] y  ## Enter Y and press Enter
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y  ## Enter Y and press Enter
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

Install PHP

PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely used open-source general purpose scripting language that is especially suited for web development and can be embedded into HTML.

Install PHP with following command:

In Fedora 23/22:

dnf install php-fpm php-mysql php-common

In Fedora 21 and earlier versions:

yum install php-fpm php-mysql php-common

Enable and start php–fpm service:

systemctl enable php-fpm.service

systemctl start php-fpm.service

Configure PHP:

Open up /etc/php.ini file in any editor:

vi /etc/php.ini

Find the line cgi.fix_pathinfo, uncomment and change the value from 1 to 0 (zero):

[...];
 http://www.php.net/manual/en/ini.core.php#ini.cgi.fix-pathinfo
cgi.fix_pathinfo=0
[...]

Open up the file /etc/php-fpm.d/www.conf:

vi /etc/php-fpm.d/www.conf

And change the user and group values from apache to nginx:

[...]
; Unix user/group of processes
; Note: The user is mandatory. If the group is not set, the default user's group
;       will be used.
; RPM: apache Choosed to be able to access some dir as httpd
user = nginx
; RPM: Keep a group allowed to write in log dir.
group = nginx
[...]

Save and close the file. Restart php–fpm service:

systemctl restart php-fpm.service

Test PHP:

Create a sample “testphp.php” file in the Nginx document root folder:

vi /usr/share/nginx/html/testphp.php

Append the lines as shown below:

<?php
phpinfo();
?>

Save and close the file.

Now, Restart Nginx service using command:

systemctl restart nginx.service

Navigate to http://server-ip-address/testphp.php. It will display all the details about PHP such as version, build date and commands etc.

Install PHP Modules:

Search for the available PHP modules using the following command:

In Fedora 23/22:

dnf search php

In Fedora 21 and earlier versions:

yum search php

Now install the required module of your choice, for example php-mysql, using the following command:

In Fedora 23/22:

dnf install php-mysql -y

In Fedora 21 and earlier versions:

yum install php-mysql -y

Restart the httpd service.

systemctl restart httpd

To verify the modules, open your web browser and navigate to http://server-ip-address/testphp.php. You will able to see the installed PHP modules.

As you see in the above screenshot, php-mysql module has been installed and activated.

That’s it. LEMP server has been installed, and it is ready to host your website now.

IF you want to install LAMP stack, check the following link.

How To Install LAMP Stack In Fedora 23

Cheers!

The post How To Install LEMP Stack On Fedora 23 appeared first on Unixmen.

↧

How To Install Linux Kernel 4.3.0

November 30, 2015, 3:58 am

≪ Previous: How To Install LEMP Stack On Fedora 23

The Linux Kernel development team has announced the latest stable Kernel version 4.3.0 on November 1, 2015. Linux Torvolds wrote in the release notes:

So it *felt* like the last week of the rc series was busy, to the
point where I got a bit worried about the release. But doing the
actual numbers shows that that really was just my subjective feeling,
probably due to the kernel summit and travel back home from Korea. It
wasn't actually a particularly busy week, it's just that the pull
requests were more noticeable in the last couple of days.

We had a network update and a late fix for a x86 vm86 mode bug
introduced by the vm86 cleanups, but other than that it's just a
collection of various small oneliners all over. Ok, the vm86 mode
thing was a one-liner too, it was just slightly more nerve-wracking
because it looked scarier than it was before people (Andy) figured out
what was going on.

The changes from rc7 are dominated by the network stuff, but as you
can tell from the appended shortlog it's not anything particularly
scary.

So on the whole, this remains a rather calm release cycle until the
very end. And with the release of 4.3, obviously the merge window for
4.4 is open, and let's keep our fingers crossed that that will be an
equally calm release. Especially since apparently Greg has decided
ahead of time (as an experiment brought on by discussion at the kernel
summit) that 4.4 will be another LTS release.

Install Linux Kernel 4.3.0

In this tutorial, we will see how to compile and install Linux Kernel 4.3.0 latest stable version in Ubuntu and CentOS.

First, we will see how to install Kernel 4.3.0 in Ubuntu 15.10 server.

1. Install Linux Kernel 4.3.0 in Ubuntu

The following steps are tested in Ubuntu 15.10 server edition. However, the same steps might work on Debian, and other Ubuntu derivatives such as Linux Mint, Elementary OS etc.

Run the following command to find the current Linux kernel version installed on your system:

uname -r

Sample output:

4.2.0-16-generic

As you see in the above input, the currently installed version is 4.2.0. Let us upgrade it to 4.3.0.

To do that, first download the Kernel 4.3.0 stable version from the official website using the following command.

On 64bit Ubuntu systems:

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-headers-4.3.0-040300-generic_4.3.0-040300.201511020949_amd64.deb

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-headers-4.3.0-040300_4.3.0-040300.201511020949_all.deb

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-image-4.3.0-040300-generic_4.3.0-040300.201511020949_amd64.deb

On 32bit Ubuntu systems:

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-headers-4.3.0-040300_4.3.0-040300.201511020949_all.deb

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-headers-4.3.0-040300-generic_4.3.0-040300.201511020949_i386.deb

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/linux-image-4.3.0-040300-generic_4.3.0-040300.201511020949_i386.deb

After downloading the necessary Kernel packages depending upon your Ubuntu system’s architecture, run the following commands to install Kernel 4.3.0:

sudo dpkg -i *.deb

If the above command doesn’t work, run the following commands instead.

sudo apt-get install gdebi

sudo gdebi linux-headers-4.3*.deb linux-image-4.3*.deb

Update the Grub boot loader using command:

sudo update-grub

Sample output:

Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.3.0-040300-generic
Found initrd image: /boot/initrd.img-4.3.0-040300-generic
Found linux image: /boot/vmlinuz-4.2.0-16-generic
Found initrd image: /boot/initrd.img-4.2.0-16-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin

If you’re using BURG boot loader, then run:

sudo update-burg

That’s it. Reboot your system to log in to your new Kernel.

After successful log in, run the following command to check if the new Kernel has been updated.

uname -r

Sample output:

4.3.0-040300-generic

Or, use -a flag to view the complete details:

uname -a

Sample output:

Linux server 4.3.0-040300-generic #201511020949 SMP Mon Nov 2 14:50:44 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

In case, you have some issues or end up with an unresponsive system after installing new Kernel, just reboot your system and login with your old Kernel.

Select ‘Advanced options for Ubuntu’ from the Boot menu to log in to your old Kernel.

Select the previous working kernel version, which is 4.2.0 in our case.

Then, run the following command to remove the newly installed Kernel:

sudo apt-get remove linux-header-4.3* linux-image-4.3*

Reboot your Ubuntu system to apply the changes.

2. Install Linux Kernel 4.3.0 in CentOS

Now, we will see how to install/update Linux Kernel 4.3.0 in CentOS. The steps are tested in CentOS 7, however the same steps should work on RHEL 7, Scientific Linux 7 and Fedora etc.

Kernel 4.3.0 is not included in the CentOS default repositories. In order to install the Latest stable Kernel version, we will add ELRepo. ELRepo is an RPM repository for Enterprise Linux packages. ELRepo supports Red Hat Enterprise Linux (RHEL) and its derivatives (Scientific Linux, CentOS & others).

To install ELRepo, follow the steps given below.

First of all, Import the public key:

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

To install ELRepo for RHEL/Scientific Linux/CentOS-7:

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

To make use of ELRepo mirror system, please also install yum-plugin-fastestmirror too.

yum install yum-plugin-fastestmirror

On Fedora 22 or later:

dnf install yum-plugin-fastestmirror

To install ELRepo for RHEL/Scientific Linux/CentOS-6:

rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm

To make use of ELRepo mirror system, please also install yum-plugin-fastestmirror too.

yum install yum-plugin-fastestmirror

To install ELRepo for RHEL/Scientific Linux/CentOS-5:

rpm -Uvh http://www.elrepo.org/elrepo-release-5-5.el5.elrepo.noarch.rpm

To make use of ELRepo mirror system, please also install yum-plugin-fastestmirror too.

yum install yum-plugin-fastestmirror

After installing ELRepo, let us find out the current Kernel version using command:

uname -r

Sample output:

3.10.0-123.9.3.el7.x86_64

Now, let us install the latest stable Kernel version 4.3.0 using command:

yum --enablerepo=elrepo-kernel install kernel-ml

Note: Here, Kernel-ml refers the current mainline stable version i.e 4.3.0. the letter “ml” is the short form of mainline. The kernel-ml packages are built from the sources available from the “mainline stable” branch of The Linux Kernel Archives.

Sample output:

Type ‘Y’ to continue.

Loaded plugins: fastestmirror
elrepo-kernel | 2.9 kB 00:00:00 
elrepo-kernel/primary_db | 824 kB 00:00:04 
Loading mirror speeds from cached hostfile
 * base: centos.excellmedia.net
 * elrepo: mirrors.thzhost.com
 * elrepo-kernel: mirrors.thzhost.com
 * extras: centos.excellmedia.net
 * updates: centos.excellmedia.net
Resolving Dependencies
--> Running transaction check
---> Package kernel-ml.x86_64 0:4.3.0-1.el7.elrepo will be installed
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================================================================================================
 Package Arch Version Repository Size
========================================================================================================================================================================
Installing:
 kernel-ml x86_64 4.3.0-1.el7.elrepo elrepo-kernel 37 M

Transaction Summary
========================================================================================================================================================================
Install 1 Package

Total download size: 37 M
Installed size: 169 M
Is this ok [y/d/N]: Y

That’s it. Reboot your system after the installation is completed.

Now, you’ll see the Kernel 4.3.0 entry is added to the Boot menu. Select it and hit enter to log in with new Kernel.

To check the Kernel details, run:

uname -r

Sample output:

4.3.0-1.el7.elrepo.x86_64

Or,

uname -a

Sample output:

Linux server1.unixmen.local 4.3.0-1.el7.elrepo.x86_64 #1 SMP Tue Nov 3 20:15:39 EST 2015 x86_64 x86_64 x86_64 GNU/Linux

If you have any problem after updating the latest Kernel and want to remove it, then reboot your system. Select your previous working Kernel from the boot menu:

Then, run the following command to remove the newly installed Kernel: