ajust etcd parameters

roles/etcd/templates/etcd.service.j2

@@ -24,13 +24,14 @@ ExecStart={{ bin_dir }}/etcd \
   --initial-cluster={{ ETCD_NODES }} \
   --initial-cluster-state={{ CLUSTER_STATE }} \
   --data-dir=/var/lib/etcd \
+  --snapshot-count=50000 \
   --auto-compaction-retention=1 \
   --max-request-bytes=10485760 \
   --quota-backend-bytes=8589934592
-Restart=on-failure
 Restart=always
-RestartSec=5
+RestartSec=15
 LimitNOFILE=65536
+OOMScoreAdjust=-999
 
 [Install]
 WantedBy=multi-user.target