Run mysql on the primary storage machine.

services/mysql-backup.hcl

@@ -3,11 +3,17 @@ job "mysql-backup" {
   type = "batch"
 
   periodic {
-    cron = "23 23 * * * *"
+    crons = ["23 23 * * * *"]
     prohibit_overlap = true
   }
 
   group "db" {
+    # Run on primary storage node for fast local disk access
+    constraint {
+      attribute = "${meta.storage_role}"
+      value     = "primary"
+    }
+
     task "backup" {
       driver = "raw_exec"
 
@@ -21,7 +27,7 @@ job "mysql-backup" {
         data = <<EOH
           set -e
           /run/current-system/sw/bin/nomad alloc exec -job -task=mysqld mysql \
-            mysqldump -u root --password="$MYSQL_ROOT_PASS" --all-databases > /data/compute/appdata/db-backups/mysql/backup.sql && \
+            mysqldump -u root --password="$MYSQL_ROOT_PASS" --all-databases > /data/services/db-backups/mysql/backup.sql && \
           echo "last_success $(date +%s)" | \
           /run/current-system/sw/bin/curl --data-binary @- http://pushgateway.service.consul:9091/metrics/job/mysql_backup
         EOH