Michael Skrynski
61d7a5bf78
This change transforms the cluster from single-master to a fully redundant 3-node control-plane setup for high availability. Changes: - Updated inventory/hosts.ini to promote cm4-02 and cm4-03 to master group * Added k3s_server_init flag to distinguish primary (true) from joining (false) masters * Reduced worker nodes from 3 to 1 (cm4-04) * Added clear comments explaining the HA setup - Modified roles/k3s-server/tasks/main.yml for multi-master support * Separated primary master initialization from additional master joining * Primary master (k3s_server_init=true) initializes cluster and generates token * Additional masters (k3s_server_init=false) join using primary's token * Proper sequencing ensures cluster stability during joining * Common tasks (kubeconfig setup) run on all masters - Updated site.yml for proper master deployment sequencing * Primary master deploys first and initializes cluster * Additional masters deploy serially (one at a time) for stability * Serial deployment prevents etcd consensus issues during joining * Workers join only after all masters are ready * Test deployments run on primary master only - Added comprehensive "High Availability - Multi-Master Cluster" section to README * Explains benefits of multi-master setup * Documents how to promote nodes to master * Includes monitoring and failover procedures * Shows how to recover from failed masters * Explains demoting masters back to workers Benefits: ✓ No single point of failure in control-plane ✓ Automatic etcd clustering across 3 nodes ✓ Can maintain master updates with 0 downtime ✓ Faster cluster recovery from node failures ✓ Better performance distribution for API server ✓ Works seamlessly with MikroTik VIP for external access Deployment Flow: 1. cm4-01 initializes cluster (becomes primary master) 2. cm4-02 joins as control-plane node 3. cm4-03 joins as control-plane node 4. cm4-04 joins as worker node 5. All nodes join etcd cluster with proper quorum Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
61 lines
1.0 KiB
YAML
61 lines
1.0 KiB
YAML
---
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- name: Prepare all nodes
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hosts: k3s_cluster
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gather_facts: true
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become: true
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roles:
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- role: prereq
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tags:
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- prereq
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- prepare
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- name: Setup primary k3s master (control-plane node 1)
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hosts: "{{ groups['master'][0] }}"
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become: true
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roles:
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- role: k3s-server
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tags:
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- k3s-server
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- server
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- master
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- name: Setup additional k3s masters (control-plane nodes 2+)
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hosts: "{{ groups['master'][1:] | default([]) }}"
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serial: 1
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become: true
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roles:
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- role: k3s-server
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tags:
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- k3s-server
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- server
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- master
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- name: Setup k3s agents (worker nodes)
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hosts: worker
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become: true
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roles:
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- role: k3s-agent
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tags:
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- k3s-agent
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- agent
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- worker
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- name: Install compute-blade-agent on workers
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hosts: worker
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become: true
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roles:
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- role: compute-blade-agent
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tags:
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- compute-blade-agent
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- blade-agent
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- name: Deploy test applications
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hosts: "{{ groups['master'][0] }}"
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gather_facts: true
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become: false
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roles:
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- role: k3s-deploy-test
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tags:
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- test
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- deploy-test
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