add update playbook + document

README.md

@@ -1,3 +1,20 @@
 # ansible-playbooks
 
-Ansible playbooks to manage the IT infrastructure
+Ansible playbooks to manage the IT infrastructure.
+
+## Configure hosts
+
+Make sure to define the hosts in `/etc/ansible/hosts`:
+
+```sh
+[serversgroup]
+<hostname or IP address> ansible_user=ansible
+```
+
+## Run playbooks
+
+The `ssh` credentials can be specified interactively:
+
+```sh
+ansible-playbook <playbook>.yml -k
+```

update.yml

@@ -0,0 +1,7 @@
+- hosts: dnfservers
+   tasks:
+   - name: Upgrade apt packages
+      become: yes
+      apt:
+         upgrade: "dist"
+         update_cache: yes