TechOps Examples
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🛠 TOOL OF THE DAY
cloudwatch-log-redirector - handy command-line tool helps you capture the logs from your applications and redirect them to AWS CloudWatch Logs.
🧠 USE CASE
Ansible Ping-Pong Architecture
Normal Ping output:
> ping 192.168.0.100
PING 192.168.0.100 (192.168.0.100): 56 data bytes
64 bytes from 192.168.0.100: icmp_seq=0 ttl=64 time=0.047 ms
64 bytes from 192.168.0.100: icmp_seq=1 ttl=64 time=0.056 ms
64 bytes from 192.168.0.100: icmp_seq=2 ttl=64 time=0.045 ms
Ansible Ping output:
> ansible 192.168.0.100 -m ping
> 192.168.0.100 | SUCCESS => {
"changed": false,
"ping": "pong"
}
Have you ever wondered why it is different?
The normal ping uses ICMP to check network connectivity, while Ansible's ping is a module that ensures connectivity by running Python on the remote host and returning a "pong" message.
It's more of a connectivity and system readiness check rather than just a network test.
The Ansible directory structure plays a role too.
Ansible Directory Structure
The
pingmodule lives inside/etc/ansible/ansible_plugins/modules/, where all modules reside.Ansible stores key configurations in
ansible.cfgand manages hosts viahosts.iniunder theinventorydirectory.Once you run the ping module, Ansible references this structure, ensuring the configuration and host details are in place.
Anisble Ping-Pong Architecture:
The Ansible controller receives the
ansible 192.168.0.100 -m pingrequest.It checks the
hosts.inifile in the inventory to find the target host (192.168.0.100).The
pingmodule (ansible.builtin.ping) is triggered from themodulesdirectory.The ping module establishes an SSH connection and sends the "PING packet" to the target host.
If the target host is reachable, it sends a "PONG packet" back to the controller via SSH.
The Ansible controller displays the success message, showing
"ping": "pong".
Some of the less-known ping types you should understand:
Flood Ping
Sends packets as fast as possible, useful for stress testing or debugging.
ping -f 192.168.1.1
Ping with a Set Number of Requests
Limits the number of ping requests sent.
ping -c 4 192.168.1.1
TTL Ping
Limits the Time To Live (TTL) value of a packet, often used in debugging routing loops or traceroute.
ping -t 5 192.168.1.1
Ping Broadcast
Pings every host on the local network.
ping -b 192.168.1.255
Reverse Ping (Windows)
Windows-specific, checks if another host can ping your machine.
ping -r 9 192.168.1.1
Hope this was useful and it's always interesting to see the behind-the-scenes for a stronger understanding!
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