TL; DR: I merged a few ArgoCD clusters together into a central ArgoCD last week, just to have 1 ArgoCD to manage multiple GKE clusters. Obviously this will cause some performance issue – the more apps I have, the longer it takes to refresh in ArgoCD. Here’s a simple way to scale it up.
# strategic merge patch for application controller
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: argocd-application-controller
spec:
# 2 replicas instead of 1
replicas: 2
template:
spec:
containers:
- name: argocd-application-controller
env:
- name: ARGOCD_CONTROLLER_REPLICAS
# match the number of the replicas above for proper sharding
value: "2"For Jsonnet implementation, which like it better, here’s how to patch an environment variable:
statefulset_argocd_application_controller+: {
spec+: {
replicas: app_controller_replicas,
template+: {
spec+: {
containers: [
super.containers[0] {
env: [
v
for v in super.env
if v.name != 'ARGOCD_CONTROLLER_REPLICAS'
] + [
{
name: 'ARGOCD_CONTROLLER_REPLICAS',
value: std.toString(app_controller_replicas),
},
],
},
],
},
},
},
},
...
🙂