47 lines
No EOL
1.4 KiB
Markdown
47 lines
No EOL
1.4 KiB
Markdown
# Basic High Availability (HA) Setup Using VRRP
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This guide provides a comprehensive, step-by-step process for setting up a Basic High Availability (HA)
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cluster using the Virtual Router Redundancy Protocol (VRRP) with the STACKIT CLI.
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In this HA configuration, one virtual machine (VM) functions as the active primary node while the secondary
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remains on standby.
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> For setup instructions using the STACKIT CLI instead of Terraform, please refer to the [STACKIT CLI Guide](STACKIT-CLI-GUIDE.md).
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## Testing the Setup
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After completing the setup, use the [test-setup.sh](test-setup.sh) script to verify that the Apache server is operational
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on each machine. Executing this script should yield the following results:
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```bash
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Performing curl on IP: 193.148.177.243
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<center><h1>example01</h1>
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Performing curl on IP: 193.148.161.92
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<center><h1>example02</h1>
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Performing curl on IP: 193.148.169.230
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<center><h1>example01</h1>
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```
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The output indicates a successfully functional VRRP setup.
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### Failover Testing
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To test failover, stop the master VM and perform another `curl` request to the vIP WAN IP:
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```bash
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vip01_wan_ip=$(terraform output -raw vip01-wan-ip)
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curl $vip01_wan_ip
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<center><h1>example02</h1>
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```
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The response confirms that the fail-over from the master to the backup has occurred.
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## Diagrams
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- **HA Traffic Flow**:
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- **vIP Binding Concept**:
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