From fa3b21e55b28b39719aaef472ed50c33228b1640 Mon Sep 17 00:00:00 2001
From: enggnr <129082112+enggnr@users.noreply.github.com>
Date: Fri, 30 Jun 2023 15:32:31 +0530
Subject: [PATCH] Add host to etcd cluster

---
 home/.chezmoi.yaml.tmpl                       |  2 +
 ..._onchange_before_11-join-etcd-cluster.tmpl | 38 +++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 home/.chezmoiscripts/universal/run_onchange_before_11-join-etcd-cluster.tmpl

diff --git a/home/.chezmoi.yaml.tmpl b/home/.chezmoi.yaml.tmpl
index bc2469e8..1814b675 100644
--- a/home/.chezmoi.yaml.tmpl
+++ b/home/.chezmoi.yaml.tmpl
@@ -140,6 +140,8 @@ data:
     docker:
       doRegion: nyc1
     domain: "{{ $domain }}"
+    etcd:
+      initial_cluster_urls: "node1=http://10.18.0.2:2380,etcd3=http://10.18.0.4:2380"
     headless: {{ $headless }}
     home: "{{ .chezmoi.homeDir }}"
     homeParentFolder: "{{ if eq .chezmoi.os "linux" }}/home{{ else if eq .chezmoi.os "darwin" }}/Users{{ else }}C:\Users{{ end }}"
diff --git a/home/.chezmoiscripts/universal/run_onchange_before_11-join-etcd-cluster.tmpl b/home/.chezmoiscripts/universal/run_onchange_before_11-join-etcd-cluster.tmpl
new file mode 100644
index 00000000..c7aedb21
--- /dev/null
+++ b/home/.chezmoiscripts/universal/run_onchange_before_11-join-etcd-cluster.tmpl
@@ -0,0 +1,38 @@
+{{- if (eq .host.distro.family "linux") -}}
+#!/usr/bin/env bash
+# @file etcd Clustering
+# @brief Adds the host to `etcd` cluster
+# @description
+#     This script adds the host to `etcd` cluster provided as input, if `etcd` is installed. Static clustering
+#     mechanism is used to join the host to an existing etcd cluster. The other mechanisms that are based on
+#     service discovery is not supported by this script.
+#
+#     Static mechanism needs the IP address(es) of all the participating members to bootstrap a node/member.
+#     This is the only input needed to be able to add the host as a member of the cluster. The format of this field
+#     is available in the [inputs file](https://github.com/megabyte-labs/install.doctor/blob/master/home/.chezmoi.yaml.tmpl).
+#
+#     ## Configuration Variables
+#
+#     The following chart details the input variable(s) that are used to join the host to `etcd` cluster:
+#
+#     | Variable                     | Description                                                |
+#     |------------------------------|------------------------------------------------------------|
+#     | `etcd.initial_cluster_urls`  | Appropriately formatted initial cluster configuration      |
+
+{{ includeTemplate "universal/profile-before" }}
+{{ includeTemplate "universal/logg-before" }}
+
+### Join host to `etcd` cluster
+if command -v etcd > /dev/null; then
+  logg info 'Adding host to the `etcd` cluster'
+  {{ if and .etcd.initial_cluster_urls (gt (len .etcd.initial_cluster_urls) 0) }}
+  etcd --name {{ .chezmoi.hostname }} \
+  --initial-advertise-peer-urls http://$(hostname -i):2380 --listen-peer-urls http://$(hostname -i):2380 \
+  --advertise-client-urls http://$(hostname -i):2379 --listen-client-urls http://$(hostname -i):2379 \
+  --initial-cluster "{{ .etcd.initial_cluster_urls }}" \
+  --initial-cluster-state existing
+  {{ end }}
+else
+  logg info 'etcd is not installed or it is not available in the PATH'
+fi
+{{ end -}}