GCP Google Cloud Platform - Cloud Monitoring Uptime Checks

Step-01: Introduction¶

Implement the following Cloud Monitoring concepts
Create VM Instance with sample webserver installed
Define Uptime checks
Define Alert Policy and Notification Channel
Simulate Incidents
Verify incidents in email and address incidents

Step-02: Create VM Instance with sample webserver installed¶

# Set Project
gcloud config set project PROJECT_ID
gcloud config set project gcplearn9

# Create VM Instance
gcloud compute instances create myvm1 \
  --zone=us-central1-a \
  --machine-type=e2-micro \
  --network-interface=subnet=default \
  --tags=http-server \
  --metadata-from-file=startup-script=webserver-install.sh 

# List Compute Instances
gcloud compute instances list

Step-03: Create Uptime Checks¶

Go to Cloud Monitoring -> Detect -> Uptime checks -> CREATE UPTIME CHECK

Target¶

Protocol: HTTP
Resource type: Instance
Applies to: Single
Instance: myvm1
Path: /index.html
Check Frequency: 1 minute
Regions: Global (leave to defaults)
REST ALL LEAVE TO DEFAULTS
CONTINUE

Response Validation¶

Response Timeout: 10 seconds
Content matching is enabled: Enable it
Response Content Match Type: contains
Response content: Welcome
REST ALL LEAVE DEFAULTS
CONTINUE

Alert & Notification¶

Create an alert: enable it
Name: Uptime failure
Durantion: 1 minute
Notifications: Create new Notification channel (EMAIL)
CONTINUE

Review¶

Enter a name for the uptime check
Title: myvm1 uptime check
Click on CREATE

Step-04: Verify Uptime checks¶

Go to Cloud Monitoring -> Detect -> Uptime checks -> myvm1 uptime check
```
# Verify check_passed value
check_passed=0
```

Step-05: Review Alert Policy¶

Go to Cloud Monitoring -> Detect -> Uptime checks -> myvm1 uptime check -> myvm1 uptime check uptime failure
OR
Go to Cloud Monitoring -> Detect -> Alerting -> Policies

Step-06: Stop VM and Verify the Incidents¶

# Stop VM
gcloud compute instances stop myvm1 --zone=us-central1-a

# Verify email in gmail
We should see a Incident email

# Verify the Uptime checks
Go to Cloud Monitoring -> Detect -> myvm1 uptime check 

# Verify the incidents
Go to Cloud Monitoring -> Detect -> Alerting  -> Incidents -> Open Incident

# Verify check_passed value in Alert policy
check_passed=6
Observation: should be greater than 0

Step-07: Start VM and Verify the Incidents¶

# Start VM
gcloud compute instances start myvm1 --zone=us-central1-a

# Verify the incidents
Go to Cloud Monitoring -> Detect -> Alerting  -> Incidents -> Open Incident
check_passed=6
Observation: 
1. should be check_passed=0
2. Incident should be auto-closed

Step-08: Review¶

# Connect to VM Instance
gcloud compute ssh --zone "us-central1-a" "myvm1" --project "gcplearn9"

# Verify Nginx access logs
tail -100f /var/log/nginx/access.log

# Sample Log - Cloud Monitoring Entries
35.205.72.231 - - [03/May/2024:04:32:05 +0000] "GET /index.html HTTP/1.1" 200 248 "-" "GoogleStackdriverMonitoring-UptimeChecks(https://cloud.google.com/monitoring)"
35.238.118.210 - - [03/May/2024:04:32:10 +0000] "GET /index.html HTTP/1.1" 200 248 "-" "GoogleStackdriverMonitoring-UptimeChecks(https://cloud.google.com/monitoring)"