DevOps Classroom notes 03/Aug/2025

Ansible

Adhoc commands

• Ansible allows us to automate individual commands using adhoc commands

ansible  -m [module] -a "[module options]"  [pattern]

• Lets Try file creation

 ansible -i hosts -m file -a "path=/tmp/1.txt state=touch" all

• Lets try adding a user called as test
  • homedirectory = “/opt/test”
  • shell = “/bin/sh”
  • username = “test”

ansible -i hosts -m user -a "name=test home=/opt/test shell=/bin/sh" all

Tomcat configuration.

• Manual steps

sudo apt update
sudo apt install openjdk-17-jdk -y
sudo useradd -m -d /opt/tomcat -U -s /bin/false tomcat
wget https://dlcdn.apache.org/tomcat/tomcat-10/v10.1.25/bin/apache-tomcat-10.1.25.tar.gz -P /tmp
sudo mkdir /opt/tomcat
sudo tar -xvf /tmp/apache-tomcat-10.1.25.tar.gz -C /opt/tomcat --strip-components=1
sudo chown -R tomcat:tomcat /opt/tomcat
sudo chmod -R g+r /opt/tomcat/conf
sudo chmod g+x /opt/tomcat/conf

• Ansible doesnot support –strip-components=1, so we need a workaround
  • if you dont find the right module there is a way to run raw linux command. The side effect of this approach is no desired state and it executes every time.
  • Change your manual steps accordingly

Lets take the approach 1: running raw linux commands

• Refer Here for available command modules

Better way

• Refer Here for changes