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--- lab:stack_-_discover_and_add_to_inventory [2023/04/28 21:47] – [Step 3 - Identify Nodes That Weren't Discovered] user
+++ lab:stack_-_discover_and_add_to_inventory [2023/05/01 19:43] (current) – updated user
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-====== Stack - Discover NUCs and Add to Inventory ======
-Now that you have your [[Stack of NUCs]] all built, updated, and connected to the wireless network, it is time to set them all up in the Ansible inventory so we can start doing things with them.
-Purpose:
-  * Discover local hosts that the Ansible control node can access
-  * Add these hosts to our inventory
-====== Step 1 - Power on All NUCs ======
-Power on all the NUCs. WiFi connectivity should make all visible to [[Stack - NUC 2|NUC 2]], the Ansible control node.
-====== Step 2 - Discover and Add to Inventory ======
-Run the discovery script from the Ansible control node ([[Stack - NUC 2|NUC 2]]), and add the IP address to the inventory file ('hosts')
-    * example:
-      * ''cd my-project''
-      * ''bash discover.sh hosts''
-    * <file bash discover.sh>
-if [ "$#" -ne 1 ]
-then
-  echo "Usage: $0 filename.txt"
-  echo "results will be appended to this file"
-  exit 1
-fi
-OUTPUT=$1
-[[ ! -z "$OUTPUT" ]] && touch $OUTPUT || exit
-IPs=$(sudo arp-scan --localnet --numeric --quiet --ignoredups | grep -E '([a-f0-9]{2}:){5}[a-f0-9]{2}' | awk '{print $1}')
-for i in ${IPs}; do
-  # set up SSH managment keys
-  ssh-keygen -q -R $i && ssh-keyscan -H $i >> ~/.ssh/known_hosts
-  # identify hosts ansible can access
-  ssh -q -o PasswordAuthentication=No $i "hostname -I" && echo $i && echo $i >> $OUTPUT
-done
-</file>
-====== Step 3 - Identify Nodes That Weren't Discovered ======
-This is a quick and easy way to determine which ones weren't discovered: power off the ones that are working. Any of the NUCs still on has a problem.
-''ansible -i hosts all -a "poweroff"''
-Pull these NUCs for re-imaging/investigation. Next, power the "good" NUCs back on
-You now have a working Ansible environment! Continue to our First Ansible playbook with [[stack_-_ansible_-_update|Ansible Update]].
-====== Optional ======
-Since the lldpd package was installed, you can also discover the nodes using
-  * ''lldpcli show neighbors''