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8 Popular Steps to Install Mono on RedHat/CentOS 7

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In this article, I will take you through 8 Popular Steps to Install Mono on RedHat/CentOS 7. Mono is a popular tool in Linux platform used for compiling and executing C# Program. This tool helps Microsoft C# Professionals to write and execute C# code in Linux Platform.

8 Popular Steps to Install Mono on RedHat/CentOS 7 1

Install Mono on CentOS 7

Also Read: 6 Useful C# For Loop Examples

Step 1: Prerequisites

a)You require a running RedHat/CentOS 7 System.

b)You need to have sudo access. You can check Step By Step: How to add User to Sudoers into Ubuntu 18.04 to provide sudo access to User.

Step 2: Update Your System

First you need to update your system before proceeding with the next step using yum -y update command.

[root@localhost ~]# yum -y update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.piconets.webwerks.in
* epel: mirrors.piconets.webwerks.in
* extras: mirrors.piconets.webwerks.in
* updates: mirrors.piconets.webwerks.in
Resolving Dependencies
--> Running transaction check
---> Package NetworkManager.x86_64 1:1.18.0-5.el7_7.1 will be updated
---> Package NetworkManager.x86_64 1:1.18.0-5.el7_7.2 will be an update
---> Package NetworkManager-libnm.x86_64 1:1.18.0-5.el7_7.1 will be updated
---> Package NetworkManager-libnm.x86_64 1:1.18.0-5.el7_7.2 will be an update
---> Package NetworkManager-team.x86_64 1:1.18.0-5.el7_7.1 will be updated
---> Package NetworkManager-team.x86_64 1:1.18.0-5.el7_7.2 will be an update
---> Package NetworkManager-tui.x86_64 1:1.18.0-5.el7_7.1 will be updated
---> Package NetworkManager-tui.x86_64 1:1.18.0-5.el7_7.2 will be an update
---> Package binutils.x86_64 0:2.27-41.base.el7_7.1 will be updated
---> Package binutils.x86_64 0:2.27-41.base.el7_7.3 will be an update
---> Package curl.x86_64 0:7.29.0-54.el7_7.1 will be updated
---> Package curl.x86_64 0:7.29.0-54.el7_7.2 will be an update
---> Package docker.x86_64 2:1.13.1-103.git7f2769b.el7.centos will be updated
---> Package docker.x86_64 2:1.13.1-109.gitcccb291.el7.centos will be an update
---> Package docker-client.x86_64 2:1.13.1-103.git7f2769b.el7.centos will be updated
---> Package docker-client.x86_64 2:1.13.1-109.gitcccb291.el7.centos will be an update
---> Package docker-common.x86_64 2:1.13.1-103.git7f2769b.el7.centos will be updated
---> Package docker-common.x86_64 2:1.13.1-109.gitcccb291.el7.centos will be an update
---> Package epel-release.noarch 0:7-11 will be updated
---> Package epel-release.noarch 0:7-12 will be an update
---> Package firewalld.noarch 0:0.6.3-2.el7_7.2 will be updated
---> Package firewalld.noarch 0:0.6.3-2.el7_7.4 will be an update

Step 3: Install Yum Utils Packages

Now you need to install yum-utils package using yum install -y yum-utils command as shown below. This package will install yum-config-manager tool which is required for adding mono repository.

[root@localhost ~]# yum install -y yum-utils
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.piconets.webwerks.in
* epel: mirrors.piconets.webwerks.in
* extras: mirrors.piconets.webwerks.in
* updates: mirrors.piconets.webwerks.in
Resolving Dependencies
--> Running transaction check
---> Package yum-utils.noarch 0:1.1.31-52.el7 will be installed
--> Processing Dependency: python-kitchen for package: yum-utils-1.1.31-52.el7.noarch
--> Processing Dependency: libxml2-python for package: yum-utils-1.1.31-52.el7.noarch
--> Running transaction check
---> Package libxml2-python.x86_64 0:2.9.1-6.el7_2.3 will be installed
---> Package python-kitchen.noarch 0:1.1.1-5.el7 will be installed
--> Processing Dependency: python-chardet for package: python-kitchen-1.1.1-5.el7.noarch
--> Running transaction check
---> Package python-chardet.noarch 0:2.2.1-3.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================================================================================================
Package Arch Version Repository Size
========================================================================================================================================================================
Installing:
yum-utils noarch 1.1.31-52.el7 base 121 k
Installing for dependencies:
libxml2-python x86_64 2.9.1-6.el7_2.3 base 247 k
python-chardet noarch 2.2.1-3.el7 base 227 k
python-kitchen noarch 1.1.1-5.el7 base 267 k

Transaction Summary
========================================================================================================================================================================
Install 1 Package (+3 Dependent packages)

Total download size: 862 k
Installed size: 4.3 M
Downloading packages:
(1/4): python-kitchen-1.1.1-5.el7.noarch.rpm | 267 kB 00:00:00
(2/4): yum-utils-1.1.31-52.el7.noarch.rpm | 121 kB 00:00:00
(3/4): libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm | 247 kB 00:00:00
(4/4): python-chardet-2.2.1-3.el7.noarch.rpm | 227 kB 00:00:00
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 1.0 MB/s | 862 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : python-chardet-2.2.1-3.el7.noarch 1/4
Installing : python-kitchen-1.1.1-5.el7.noarch 2/4
Installing : libxml2-python-2.9.1-6.el7_2.3.x86_64 3/4
Installing : yum-utils-1.1.31-52.el7.noarch 4/4
Verifying : python-kitchen-1.1.1-5.el7.noarch 1/4
Verifying : yum-utils-1.1.31-52.el7.noarch 2/4
Verifying : libxml2-python-2.9.1-6.el7_2.3.x86_64 3/4
Verifying : python-chardet-2.2.1-3.el7.noarch 4/4

Installed:
yum-utils.noarch 0:1.1.31-52.el7

Dependency Installed:
libxml2-python.x86_64 0:2.9.1-6.el7_2.3 python-chardet.noarch 0:2.2.1-3.el7 python-kitchen.noarch 0:1.1.1-5.el7

Complete!

Step 4: Add Repo

Now that you have installed yum-config-manager, you need to add the Mono repository using yum-config-manager to download the mono packages as shown in below command.

[root@localhost ~]# yum-config-manager --add-repo http://download.mono-project.com/repo/centos/
Loaded plugins: fastestmirror
adding repo from: http://download.mono-project.com/repo/centos/

[download.mono-project.com_repo_centos_]
name=added from: http://download.mono-project.com/repo/centos/
baseurl=http://download.mono-project.com/repo/centos/
enabled=1

Step 5: Clear Older YUM Cache

We can clear old yum cache and remove all previous yum leftover using yum clean all command as shown below.

[root@localhost ~]# yum clean all
Loaded plugins: fastestmirror
Cleaning repos: base download.mono-project.com_repo_centos_ epel extras kubernetes nodesource puppetlabs-pc1 updates
Cleaning up list of fastest mirrors

Step 6: Build Up New YUM Cache

Once everything is cleared from the cache, then we can build new cache using yum makecache command as shown below.

[root@localhost ~]# yum makecache
Loaded plugins: fastestmirror
Determining fastest mirrors
epel/x86_64/metalink | 8.6 kB 00:00:00
* base: mirrors.piconets.webwerks.in
* epel: mirrors.piconets.webwerks.in
* extras: mirrors.piconets.webwerks.in
* updates: mirrors.piconets.webwerks.in
base | 3.6 kB 00:00:00
download.mono-project.com_repo_centos_ | 2.9 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 2.9 kB 00:00:00
kubernetes/signature | 454 B 00:00:00
kubernetes/signature | 1.4 kB 00:00:00 !!!
nodesource | 2.5 kB 00:00:00
puppetlabs-pc1 | 2.5 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/28): base/7/x86_64/group_gz | 165 kB 00:00:00
(2/28): download.mono-project.com_repo_centos_/primary_db | 1.5 MB 00:00:01
(3/28): base/7/x86_64/primary_db | 6.0 MB 00:00:02
(4/28): base/7/x86_64/other_db | 2.6 MB 00:00:02
(5/28): download.mono-project.com_repo_centos_/other_db | 114 kB 00:00:01
(6/28): epel/x86_64/group_gz | 95 kB 00:00:00
(7/28): epel/x86_64/prestodelta | 75 B 00:00:00
(8/28): base/7/x86_64/filelists_db | 7.3 MB 00:00:05
(9/28): epel/x86_64/primary_db | 6.8 MB 00:00:03
(10/28): extras/7/x86_64/filelists_db | 217 kB 00:00:00
(11/28): extras/7/x86_64/primary_db | 165 kB 00:00:00
(12/28): extras/7/x86_64/other_db | 106 kB 00:00:00
(13/28): download.mono-project.com_repo_centos_/filelists_db | 984 kB 00:00:07
(14/28): epel/x86_64/other_db | 3.2 MB 00:00:01
(15/28): epel/x86_64/updateinfo | 1.0 MB 00:00:05
(16/28): kubernetes/filelists | 22 kB 00:00:01
(17/28): kubernetes/primary | 66 kB 00:00:01
(18/28): nodesource/x86_64/primary_db | 25 kB 00:00:00
(19/28): nodesource/x86_64/filelists_db | 342 kB 00:00:00
(20/28): kubernetes/other | 42 kB 00:00:00
(21/28): nodesource/x86_64/other_db | 3.4 kB 00:00:00
(22/28): puppetlabs-pc1/x86_64/primary_db | 234 kB 00:00:00
(23/28): puppetlabs-pc1/x86_64/other_db | 13 kB 00:00:00
(24/28): updates/7/x86_64/other_db | 573 kB 00:00:00
(25/28): updates/7/x86_64/filelists_db | 4.5 MB 00:00:01
(26/28): puppetlabs-pc1/x86_64/filelists_db | 7.6 MB 00:00:04
(27/28): epel/x86_64/filelists_db | 11 MB 00:00:13
(28/28): updates/7/x86_64/primary_db | 7.6 MB 00:00:08
kubernetes 481/481
kubernetes 481/481
kubernetes 481/481
Metadata Cache Created

Step 7: Install Mono

You can install mono using yum install -y mono-complete command as shown below.

[root@localhost ~]# yum install -y mono-complete
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.piconets.webwerks.in
* epel: mirrors.piconets.webwerks.in
* extras: mirrors.piconets.webwerks.in
* updates: mirrors.piconets.webwerks.in
Resolving Dependencies
--> Running transaction check
---> Package mono-complete.x86_64 0:6.8.0.105-0.xamarin.3.epel7 will be installed
--> Processing Dependency: mono-data-sqlite = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: libmonosgen-2_0-devel = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: install mono = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-reactive = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: libmonoboehm-2_0-devel = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: libmonoboehm-2_0-1 = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-wcf = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: libmono-llvm0 = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-web = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-extras = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: monodoc-core = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: ibm-data-db2 = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: libmonosgen-2_0-1 = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-locale-extras = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: libmono-2_0-1 = 6.8.0.105 for package: mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: libmono-2_0-devel = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-mvc = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-winfxcore = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-data-oracle = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-data = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-core = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64
--> Processing Dependency: mono-devel = 6.8.0.105 for package: install mono-complete-6.8.0.105-0.xamarin.3.epel7.x86_64

Installed:
mono-complete.x86_64 0:6.8.0.105-0.xamarin.3.epel7

Dependency Installed:
glib2-devel.x86_64 0:2.56.1-5.el7 ibm-data-db2.x86_64 0:6.8.0.105-0.xamarin.3.epel7
libexif.x86_64 0:0.6.21-6.el7 libgdiplus-devel.x86_64 0:6.0.4-0.xamarin.1.epel7
libgdiplus0.x86_64 0:6.0.4-0.xamarin.1.epel7 libmono-2_0-1.x86_64 0:6.8.0.105-0.xamarin.3.epel7
libmono-2_0-devel.x86_64 0:6.8.0.105-0.xamarin.3.epel7 libmono-llvm0.x86_64 0:6.8.0.105-0.xamarin.3.epel7
libmonoboehm-2_0-1.x86_64 0:6.8.0.105-0.xamarin.3.epel7 libmonoboehm-2_0-devel.x86_64 0:6.8.0.105-0.xamarin.3.epel7
libmonosgen-2_0-1.x86_64 0:6.8.0.105-0.xamarin.3.epel7 libmonosgen-2_0-devel.x86_64 0:6.8.0.105-0.xamarin.3.epel7
mono-core.x86_64 0:6.8.0.105-0.xamarin.3.epel7 install mono-data.x86_64 0:6.8.0.105-0.xamarin.3.epel7
mono-data-oracle.x86_64 0:6.8.0.105-0.xamarin.3.epel7 install mono-data-sqlite.x86_64 0:6.8.0.105-0.xamarin.3.epel7
mono-devel.x86_64 0:6.8.0.105-0.xamarin.3.epel7 mono-extras.x86_64 0:6.8.0.105-0.xamarin.3.epel7
mono-llvm-tools.x86_64 0:6.0+mono20190708165219-0.xamarin.1.epel7 mono-locale-extras.x86_64 0:6.8.0.105-0.xamarin.3.epel7
mono-mvc.x86_64 0:6.8.0.105-0.xamarin.3.epel7 mono-reactive.x86_64 0:6.8.0.105-0.xamarin.3.epel7
mono-wcf.x86_64 0:6.8.0.105-0.xamarin.3.epel7 mono-web.x86_64 0:6.8.0.105-0.xamarin.3.epel7
mono-winforms.x86_64 0:6.8.0.105-0.xamarin.3.epel7 mono-winfxcore.x86_64 0:6.8.0.105-0.xamarin.3.epel7
monodoc-core.x86_64 0:6.8.0.105-0.xamarin.3.epel7 msbuild.noarch 1:16.5+xamarinxplat.2020.01.10.05.36-0.xamarin.2.epel7
msbuild-libhostfxr.x86_64 0:3.0.0.2019.04.16.02.13-0.xamarin.4.epel7 msbuild-sdkresolver.noarch 1:16.5+xamarinxplat.2020.01.10.05.36-0.xamarin.2.epel7
pcre-devel.x86_64 0:8.32-17.el7 unzip.x86_64 0:6.0-20.el7

Complete!

If you see any key error during or after installation, then you can use below command to import the key.

rpm --import "http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF"

Step 8: Write Your First C# Program

Once mono is successfully installed, we can now write a small program to test the installation. In this program, we are displaying "Hello World!" in the Console Output.

[root@localhost ~]# vi hello.cs
public class HelloWorld 
{
    public static void Main() 
    {
      System.Console.WriteLine("Hello, World!");
    }
}

Compile Your Program

You can compile hello.cs program using mcs hello.cs command as specified below.

[root@localhost ~]# mcs hello.cs

Run Your Program

Now you can run your program using mono hello.exe command and check the output.

[root@localhost ~]# mono hello.exe
Hello, World!

 

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