Basic HA Setup (VRRP)

Documentation on how to set up an active passive VRRP Cluster All the needed Commands use the STACKIT Cli.

Overview core components:

VRRP Sync between two Virtual Machines including Security Groups and Port Security setup (additional adresses)

Basic Network Config

Creation of a STACKIT Network where the VMs and NIC adapters will be placed.

NETWORKID=$(stackit network create --name demo --ipv4-dns-name-servers "1.1.1.1,8.8.8.8,9.9.9.9" --ipv4-prefix "10.1.2.0/24" -y -o json | jq -r .networkId)

Security Groups

Basic Security Group to allow VRRP & ICMP Traffic for failover

Create the Security Group:

SECGROUPID=$(stackit security-group create --name VRRP -y -o json | jq -r .id)

Create the Security Rules: Allow VRRP & ICMP for testing only

stackit security-group rule create --security-group-id $SECGROUPID --direction ingress --protocol-name icmp 
stackit security-group rule create --security-group-id $SECGROUPID --direction ingress --protocol-name vrrp

Network Adapters

We need three network interfaces. One for each server an the third for registering the internal vip address.

Network Interface for the VIP:

VIPNICID=$(stackit network-interface create --network-id $NETWORKID --name vipPort -y -o json | jq -r .id)

Get the (v)IP of the NIC:

VIPIP=$(stackit network-interface describe $VIPNICID --network-id $NETWORKID -o json | jq -r .ipv4)

Network Interface for the VMs:

NICID=$(stackit network-interface create --network-id $NETWORKID --allowed-addresses $VIPIP --name <nicName> --security-groups $SECGROUPID,<defaultSecGroupId> -y -o json | jq -r .id)

Set up the virtual Machines

Create two VMs with a Debian 12 as OS.

stackit server create --boot-volume-performance-class storage_premium_perf4 --boot-volume-size 32 --boot-volume-source-type image --boot-volume-source-id 03e19c6a-d73a-4ba9-96af-4bd03cf905d3 --keypair-name <sshKeyPair> --availability-zone eu01-1 --machine-type c1.2 --name <serverName> --network-interface-ids $NICID

External floating Addresses (HA)

To access the HA cluster from the Internet bind a Public IP to our vIP NIC adapter so the WAN ip is always pointed to the active replica.

stackit public-ip create --associated-resource-id $VIPNICID

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