RH294 - ch10s02

In this review, you will install Ansible on workstation, use it as a control node, and configure it for connections to the managed hosts servera and serverb. Use ad hoc commands to perform actions on managed hosts.

Outcomes

You should be able to:

Install Ansible.
Use ad hoc commands to perform actions on managed hosts.

On workstation, run the lab review-deploy start command. This script ensures that the managed hosts, servera and serverb, are reachable on the network. The script creates a lab subdirectory named review-deploy in the student's home directory.

[student@workstation ~]$ lab review-deploy start

Procedure 10.1. Instructions

Install Ansible on workstation so that it can serve the control node.

[student@workstation ~]$ sudo yum install ansible
[sudo] password for student:
Loaded plugins: langpacks, search-disabled-repos
Resolving Dependencies
--> Running transaction check
...output omitted...
Is this ok [y/d/N]: y
...output omitted...

On the control node, create an inventory file, /home/student/review-deploy/inventory, containing a group called dev. This group should consist of the managed hosts servera.lab.example.com and serverb.lab.example.com.
Change directory into the Ansible project directory, /home/student/review-deploy, created by the setup script.
[student@workstation ~]$ cd ~/review-deploy
Create the inventory file with the following content.
[dev] servera.lab.example.com serverb.lab.example.com
Create the Ansible configuration file in /home/student/review-deploy/ansible.cfg. The configuration file should reference the /home/student/review-deploy/inventory inventory file.
Add the following entries to configure the inventory file ./inventory as the inventory source. Save the changes and exit the text editor.
[defaults] inventory=./inventory

Execute an ad hoc command using privilege escalation to modify the contents of the /etc/motd file on servera and serverb to contain the string Managed by Ansible\n. Use devops as the remote user.

[student@workstation review-deploy]$ ansible dev -m copy \
> -a 'content="Managed by Ansible\n" dest=/etc/motd' -b -u devops
servera.lab.example.com | CHANGED => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/libexec/platform-python"
    },
    "changed": true,
    "checksum": "4458b979ede3c332f8f2128385df4ba305e58c27",
    "dest": "/etc/motd",
    "gid": 0,
    "group": "root",
    "md5sum": "65a4290ee5559756ad04e558b0e0c4e3",
    "mode": "0644",
    "owner": "root",
    "secontext": "unconfined_u:object_r:etc_t:s0",
    "size": 19,
    "src": "/home/devops/.ansible/tmp/...output omitted...",
    "state": "file",
    "uid": 0
}
serverb.lab.example.com | CHANGED => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/libexec/platform-python"
    },
    "changed": true,
    "checksum": "4458b979ede3c332f8f2128385df4ba305e58c27",
    "dest": "/etc/motd",
    "gid": 0,
    "group": "root",
    "md5sum": "65a4290ee5559756ad04e558b0e0c4e3",
    "mode": "0644",
    "owner": "root",
    "secontext": "system_u:object_r:etc_t:s0",
    "size": 19,
    "src": "/home/devops/.ansible/tmp/...output omitted...",
    "state": "file",
    "uid": 0
}

Execute an ad hoc command to verify that the contents of the /etc/motd file on servera and serverb are identical.

[student@workstation review-deploy]$ ansible dev -m command -a "cat /etc/motd"
servera.lab.example.com | CHANGED | rc=0 >>
Managed by Ansible

serverb.lab.example.com | CHANGED | rc=0 >>
Managed by Ansible

Evaluation

On workstation, run the lab review-deploy grade command to confirm success on this exercise. Correct any reported failures and rerun the command until successful.

[student@workstation ~]$ lab review-deploy grade

Finish

On workstation, run the lab review-deploy finish command to clean up this exercise.

[student@workstation ~]$ lab review-deploy finish

This concludes the lab.

Discuss Red Hat Enterprise Linux Automation with Ansible

Go to community

Red Hat Linux Automation with Ansible (RH294)

Haley_Ruccio

24 lip 2023

Learn how to automate Linux system administration tasks with Red Hat Ansible Automation PlatformRed Hat Enterprise Linux Automation with Ansible (RH294) is designed for Linux administrators and developers who need to automate repeatable and error-prone steps for system provisioning, configuration, application deployment, and orchestration. This course is based on Red Hat® Enterprise Linux® 9 and Red Hat Ansible Automation Platform 2.2.Course content summaryInstall Red Hat Ansible Automation Platform on control nodes.Create and update inventories of managed hosts and manage connections to them.Automate administration tasks with Ansible Playbooks and ad hoc commands.Write effective playbooks at scale.Protect sensitive data used by Ansible Automation Platform with Ansible Vault.Reuse code and simplify playbook development with Ansible Roles and Ansible Content Collections.Audience for this courseThis course is geared toward Linux system administrators, DevOps engineers, infrastructure automation engineers, and systems design engineers who are responsible for these tasks:Automating configuration managementEnsuring consistent and repeatable application deploymentProvisioning and deployment of development, testing, and production serversIntegrating with DevOps continuous integration/continuous delivery workflowsPrerequisites for this coursePass the Red Hat Certified System Administrator (RHCSA) exam (EX200), or demonstrate equivalent Red Hat Enterprise Linux knowledge and experience.Take our free assessment to gauge whether this offering is the best fit for your skills.

980

curl finds no route to host?

TPeters

23 lip 2023

I am doing the self-paced course RH294 . With two exercises (Ch.3 final Lab and Ch.4 lab exercise 2) I ran into this problem:after installing and starting a web service, from the classroom web termicaI I cannot reach servera.lab.example.com with curl: "No route to host". This despite the fact that I can ping it, open a shell to it, and install the package on it with Ansible.Anyone else have the same problem?What might be the cause?

1702

Welcome to the Red Hat Linux Automation with Ansible (RH294) group in the Red Hat Learning Community

cschunke

18 lip 2023

We are excited to launch a space dedicated to the Red Hat Training course Red Hat Linux Automation with Ansible! To gain the most value from this group - click the "Join Group" button in the upper right hand corner.We encourage group members to collaborate in this group to discuss topics, ask questions, share best practices and tips, provide course feedback, and share their accomplishments as it relates to RH294.Read more about Red Hat Linux Automation with Ansible here.

351

Revision: rh294-8.4-9cb53f0