sudo systemctl status cloud-ops-agent"*" -=> Verify that the agent is working as expected
Create an uptime check
It verify that a resource is always accessible
In the Cloud Console, in the left menu, click Uptime checks, and then click +Create Uptime Check
Set the required fields
Click on Next to leave the other details to default and click Test to verify that your uptime check can connect to the resource
When you see a green check mark everything can connect. Click Create
Create an alerting policy
In the left menu, click Alerting, and then click +Create Policy
Click on Select a metric dropdown. Disable the Show only active resources & metrics
Type Network traffic in filter by resource and metric name and click on VM instance > interface. Select Network traffic (agent.googleapis.com/interface/traffic) and click Apply > Next
Set the Threshold position to Above threshold, Threshold value to 500 and Advanced Options > Retest window to 1 min. Click Next
Click on drop down arrow next to Notification Channels, then click on Manage Notification Channels
Scroll down the page and click on ADD NEW for Email
In Create Email Channel dialog box, enter your personal email address in the Email Address field and a Display name > Save
Go back to the previous Create alerting policy tab
Click on Notification Channels again, then click on the Refresh icon to get the display name you mentioned in the previous step
Click on Notification Channels again if necessary, select your Display name and click OK
Add a message in documentation, which will be included in the emailed alert
Mention the Alert name as Inbound Traffic Alert > Next
Review the alert and click Create Policy
Create a dashboard and chart
You can display the metrics collected by Cloud Monitoring in your own charts and dashboards
In the left menu select Dashboards, and then +Create Dashboard
Name the dashboard
Add the first chart
Click Line option in Chart library
Name the chart title
Click on Resource & Metric dropdown. Disable the Show only active resources & metrics
Type CPU load (1m) in filter by resource and metric name and click on VM instance > Cpu. Select CPU load (1m) and click Apply. Leave all other fields at the default value. Refresh the tab to view the graph
Add the second chart
Click + Add Chart and select Line option in Chart library
Name this chart and follow previous steps
View your logs
Select Navigation menu > Logging > Logs Explorer
Select the logs you want to see > Resource
Select VM Instance > instanceName in the Resource drop-down menu
Apply > Stream logs
Start and stop the VM instance
Open the Compute Engine window in a new browser window. Select Navigation menu > Compute Engine, right-click VM instances > Open link in new window
In the Compute Engine window, select the instance, click the three vertical dots at the top of the screen and then click Stop, and then confirm to stop the instance
In the VM instance details window, click the three vertical dots at the top of the screen and then click Start/resume, and then confirm
Check the uptime check results and triggered alerts
This view provides a list of all active uptime checks, and the status of each in different locations
In the Cloud Logging window, select Navigation menu > Monitoring > Uptime checks
Click the name of the uptime check, Lamp Uptime Check
Check if alerts have been triggered
In the left menu, click Alerting
You see incidents and events listed in the Alerting window
Check your email account. You should see Cloud Monitoring Alerts
Cloud Functions
Theory
Cloud Functions is a serverless execution environment for building and connecting cloud services
Your Cloud Function is triggered when an event being watched is fired
Cloud Functions are written in Javascript and execute in a Node.js environment on Google Cloud
Cloud Functions provides a connective layer of logic that lets you write code to connect and extend cloud services
Cloud events are things that happen in your cloud environment, You create a response to an event with a trigger
Create a function
In the console, click the Navigation menu > Cloud Functions
Click Create function > Enter the values
At the bottom, click Deploy to deploy the function
Test the function
In the Cloud Functions Overview page, display the menu for your function, and click Test function
In the Triggering event field, enter the required texts between {} and click Test the function
In the Logs field, a status code of 200 indicates success
View logs
Go to the Cloud Functions Overview page > View Logs
Google Cloud Pub/Sub
Theory
Google Cloud Pub/Sub is a messaging service for exchanging event data among applications and services
A producer of data publishes messages to a Cloud Pub/Sub topic. A consumer creates a subscription to that topic
To use a Pub/Sub, you create a topic to hold data and a subscription to access data published to the topic
Setting up Pub/Sub
Click Navigation menu > Pub/Sub > Topics > Create topic
The topic must have a unique name
Add a subscription
Click Topics in the left panel to return to the Topics page. For the topic you just made click the three dot icon > Create subscription
Fill the required details
Publish a message to the topic
At the bottom of the Topics details page, click MESSAGES tab and then click PUBLISH MESSAGE
Enter the message and click PUBLISH
To view the message you'll use the subscription to pull the message from the topic
