From a1e67dc5d41467c76ae7d19c0c3559674b64b5a7 Mon Sep 17 00:00:00 2001
From: Tim Mirecki <tim@carpages.ca>
Date: Fri, 12 Apr 2019 11:33:14 -0400
Subject: [PATCH 1/2] Add command_remove to allow a pod to exit the cluster
 gracefully. Refs #37.

---
 docker/files/cli/commands/cluster.sh | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/docker/files/cli/commands/cluster.sh b/docker/files/cli/commands/cluster.sh
index a23b99f..db9fd74 100644
--- a/docker/files/cli/commands/cluster.sh
+++ b/docker/files/cli/commands/cluster.sh
@@ -53,11 +53,20 @@ command_query:rules() {
     proxysql_execute_query_hr "SELECT * FROM mysql_query_rules"
 }
 
-commands_add "query:nodes" "Show al the nodes of the cluster"
+commands_add "query:nodes" "Show all the nodes of the cluster"
 command_query:nodes() {
     proxysql_execute_query_hr "SELECT * FROM proxysql_servers;"
 }
 
+commands_add "remove" "Remove this node from the cluster"
+command_remove() {
+    proxysql_execute_query_hr "
+        DELETE FROM proxysql_servers
+        WHERE hostname = '${IP}';
+        LOAD PROXYSQL SERVERS TO RUN;
+    " ${PROXYSQL_SERVICE}
+}
+
 commands_add "sync" "Synchronize from backends"
 command_sync() {
     local joinExistingCluster=${1};

From 064b1d27f3e4153ff8757db53832f0d4bd7220a0 Mon Sep 17 00:00:00 2001
From: Tim Mirecki <tim@carpages.ca>
Date: Fri, 12 Apr 2019 11:40:20 -0400
Subject: [PATCH 2/2] Add preStop pod lifecycle hook to remove node from
 cluster proxysql_servers before termination.

---
 deploy/charts/proxysql-cluster/templates/statefulset.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/deploy/charts/proxysql-cluster/templates/statefulset.yaml b/deploy/charts/proxysql-cluster/templates/statefulset.yaml
index d2c9ed6..f66c0c1 100644
--- a/deploy/charts/proxysql-cluster/templates/statefulset.yaml
+++ b/deploy/charts/proxysql-cluster/templates/statefulset.yaml
@@ -53,6 +53,13 @@ spec:
             - mountPath: /etc/proxysql.cnf
               name: proxysql
               subPath: proxysql.cnf
+          lifecycle:
+            preStop:
+              exec:
+                command:
+                  - /bin/bash
+                  - -c
+                  - "/usr/bin/proxysql-cli remove"
           {{ if .Values.resources }}
           resources:
 {{ .Values.resources | indent 12 }}