TranslateProject/sources/tech/20191125 How to Install Ansible (Automation Tool) on CentOS 8-RHEL 8.md

[#]: collector: (lujun9972)
[#]: translator: ( )
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[#]: subject: (How to Install Ansible (Automation Tool) on CentOS 8/RHEL 8)
[#]: via: (https://www.linuxtechi.com/install-ansible-centos-8-rhel-8/)
[#]: author: (Pradeep Kumar https://www.linuxtechi.com/author/pradeep/)

How to Install Ansible (Automation Tool) on CentOS 8/RHEL 8
======

**Ansible** is an awesome automation tool for Linux sysadmins. It is an open source configuration tool which allows sysadmins to manage hundreds of servers from one centralize node i.e **Ansible Server**. Ansible is the preferred configuration tool when it is compared with similar tools like **Puppet**, **Chef** and **Salt** because it doesn’t need any agent and it works on SSH and python.

[![Install-Ansible-CentOS8-RHEL8][1]][2]

In this tutorial we will learn how to install and use Ansible on CentOS 8 and RHEL 8 system

Ansible Lab Details:

  * Minimal CentOS 8 / RHEL 8 Server (192.168.1.10) with Internet Connectivity
  * Two Ansible Nodes – Ubuntu 18.04 LTS (192.168.1.20) & CentOS 7 (192.168.1.30)



### Ansible Installation steps on CentOS 8 

Ansible package is not available in default CentOS 8 package repository. so we need to enable [EPEL Repository][3] by executing the following command,

```
[root@linuxtechi ~]$ sudo dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm -y
```

Once the epel repository is enabled, execute the following dnf command to install Ansible

```
[root@linuxtechi ~]$ sudo dnf install ansible
```

Output of above command :

![dnf-install-ansible-centos8][1]

Once the ansible is installed successfully, verify its version by running the following command

```
[root@linuxtechi ~]$ sudo ansible --version
```

![Ansible-version-CentOS8][1]

Above output confirms that Installation is completed successfully on CentOS 8.

Let’s move to RHEL 8 system

### Ansible Installation steps on RHEL 8

If you have a valid RHEL 8 subscription then use following subscription-manager command to enable Ansible Repo,

```
[root@linuxtechi ~]$ sudo subscription-manager repos --enable ansible-2.8-for-rhel-8-x86_64-rpms
```

Once the repo is enabled then execute the following dnf command to install Ansible,

```
[root@linuxtechi ~]$ sudo dnf install ansible -y
```

Once the ansible and its dependent packages are installed then verify ansible version by executing the following command,

```
[root@linuxtechi ~]$ sudo ansible --version
```

### Alternate Way to Install Ansible via pip3 on CentOS 8 / RHEL 8

If you wish to install Ansible using **pip** (**python’s package manager**) then first install pyhton3 and python3-pip packages using following command,

```
[root@linuxtechi ~]$ sudo dnf install python3 python3-pip -y
```

After pyhthon3 installation, verify its version by running

```
[root@linuxtechi ~]$ python3 -V
Python 3.6.8
[root@linuxtechi ~]$
```

Now run below pip3 command to install Ansible,

```
[root@linuxtechi ~]$ pip3 install ansible --user
```

Output,

![Ansible-Install-pip3-centos8][1]

Above output confirms that Ansible has been installed successfully using pip3. Let’s see how we can use Ansible

### How to Use Ansible Automation Tool?

When we install Ansible using yum or dnf command then its configuration file, inventory file and roles directory created automatically under /etc/ansible folder.

So, let’s add a group with name “**labservers**” and under this group add ubuntu 18.04 and CentOS 7 System’s ip address in **/etc/ansible/hosts** file

```
[root@linuxtechi ~]$ sudo vi /etc/ansible/hosts
…
[labservers]
192.168.1.20
192.168.1.30
…
```

Save & exit file.

Once the inventory file (/etc/ansible/hosts) is updated then exchange your user’s ssh public keys with remote systems which are part of “labservers” group.

Let’s first generate your local user’s public and private key using ssh-keygen command,

```
[root@linuxtechi ~]$ ssh-keygen
```

Now exchange public key between the ansible server and its clients using the following command,

```
[root@linuxtechi ~]$ ssh-copy-id root@linuxtechi
[root@linuxtechi ~]$ ssh-copy-id root@linuxtechi
```

Now let’s try couple of Ansible commands, first verify the connectivity from Ansible server to its clients using ping module,

```
[root@linuxtechi ~]$ ansible -m ping "labservers"
```

**Note:** If we don’t specify the inventory file in above command then it will refer the default hosts file (i.e /etc/ansible/hosts)

Output,

![ansible-ping-module-centos8][1]

Let’s check kernel version of each client using Ansible shell command,

```
[root@linuxtechi ~]$ ansible -m command -a "uname -r" "labservers"
192.168.1.30 | CHANGED | rc=0 >>
4.15.0-20-generic
192.168.1.20 | CHANGED | rc=0 >>
3.10.0-327.el7.x86_64
[root@linuxtechi ~]$
```

Use the following ansible command to list all hosts from the inventory file,

```
[root@linuxtechi ~]$ ansible all -i /etc/ansible/hosts --list-hosts
  hosts (4):
    192.168.100.1
    192.168.100.10
    192.168.1.20
    192.168.1.30
[root@linuxtechi ~]$
```

Use the following ansible command to list only hosts from “labservers” group

```
root@linuxtechi ~]$ ansible labservers -i /etc/ansible/hosts --list-hosts
  hosts (2):
    192.168.1.20
    192.168.1.30
[root@linuxtechi ~]$
```

That’s all from this article, we have successfully demonstrated on how to install and use Ansible on CentOS 8 and RHEL 8 System. Please do you share your feedback and comments.

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--------------------------------------------------------------------------------

via: https://www.linuxtechi.com/install-ansible-centos-8-rhel-8/

作者：[Pradeep Kumar][a]
选题：[lujun9972][b]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)

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