Add healthcheck to proxysql

proxysql/base/proxysql-configmap.yml

@@ -406,3 +406,10 @@ data:
         { hostname = "proxysql-1.proxysqlcluster", port = 6032, weight = 1 },
         { hostname = "proxysql-2.proxysqlcluster", port = 6032, weight = 1 }
     )
+  healthcheck.sh: |
+    #!/bin/bash
+    num_servers=$(mysql -NB -u admin -h 127.0.0.1 -P 6032 -e "select count(*) from main.mysql_servers")
+    if [[ ${num_servers} -lt 1 ]]; then
+      exit 1
+    fi
+    exit 0

proxysql/base/proxysql-deployment.yml

@@ -50,11 +50,27 @@ spec:
             - name: proxysql-etc
               mountPath: /etc
               subPath: etc
+            - name: proxysql-healthcheck
+              mountPath: /usr/local/bin/healthcheck.sh
+              subPath: healthcheck.sh
           ports:
             - containerPort: 6033
               name: proxysql-mysql
             - containerPort: 6032
               name: proxysql-admin
+          env:
+            - name: MYSQL_PWD
+              valueFrom:
+                secretKeyRef:
+                  name: proxysql-secret
+                  key: "proxysql_admin_password"
+              livenessProbe:
+                exec:
+                  command:
+                  - /bin/bash
+                  - /usr/local/bin/healthcheck.sh
+                initialDelaySeconds: 5
+                periodSeconds: 5
       initContainers:
         - image: docker.sunet.se/sunet/docker-jinja:latest
           name: init-config
@@ -309,3 +325,9 @@ spec:
             items:
               - key: "proxysql.cnf"
                 path: "proxysql.cnf"
+        - name: proxysql-healthcheck
+          configMap:
+            name: proxysql-configmap
+            items:
+              - key: "healthcheck.sh"
+                path: "healthcheck.sh"