check chkeeper health manually because swarm doesn't support depends_on-healthy_condition

clickhouse/node-entrypoints/main/00_wait_for_keeper.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+set -e
+
+keeper_hostnames=(
+	"clickhouse-keeper1"
+	"clickhouse-keeper2"
+	"clickhouse-keeper3"
+)
+keeper_healthy=(false false false)
+
+can_proceed=false
+
+while ! $can_proceed ; do
+	for keeper_idx in "${!keeper_hostnames[@]}"; do
+		if wget -q --tries=1 --spider "http://${keeper_hostnames[$keeper_idx]}:9182/ready" ; then
+			echo "keeper healthy"
+			keeper_healthy[$keeper_idx]=true
+		fi
+	done
+	can_proceed=true
+	for keeper_idx in "${!keeper_hostnames[@]}"; do
+		if ! ${keeper_healthy[$keeper_idx]} ; then
+			can_proceed=false
+			sleep 5
+			break
+		fi
+	done
+done