# Unhealthy cluster
**URL:** https://discuss.elastic.co/t/unhealthy-cluster/132664
**Category:** Elasticsearch
**Created:** [May 21, 2018, 2:03pm UTC](https://discuss.elastic.co/t/unhealthy-cluster/132664 "2018-05-21T14:03:11Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@hummingbirb](https://discuss.elastic.co/u/hummingbirb)
#### Post date: [May 21, 2018, 2:03pm UTC](https://discuss.elastic.co/t/unhealthy-cluster/132664/1 "2018-05-21T14:03:11Z")
Hi, recently I've inherited elk stack which seems to be in unhealthy condition.
There's only one node with all unassigned shards for which I'll be thankful if someone can tell me how to recover.
Here's some info I've managed to get, but please ask if you need more:
```
# curl -XGET 'localhost:9200/_cat/shards?v'
index shard prirep state docs store ip node
logs-2018.01.25 2 p STARTED 86985 32.4mb 127.0.0.1 adC2nk3
logs-2018.01.25 2 r UNASSIGNED
logs-2018.01.25 4 p STARTED 88173 33mb 127.0.0.1 adC2nk3
logs-2018.01.25 4 r UNASSIGNED
logs-2018.01.25 3 p STARTED 87965 32.8mb 127.0.0.1 adC2nk3
logs-2018.01.25 3 r UNASSIGNED
logs-2018.01.25 1 p STARTED 87669 32.8mb 127.0.0.1 adC2nk3
logs-2018.01.25 1 r UNASSIGNED
logs-2018.01.25 0 p STARTED 87080 32.7mb 127.0.0.1 adC2nk3
logs-2018.01.25 0 r UNASSIGNED
logs-2017.12.23 2 p STARTED 11941 5.3mb 127.0.0.1 adC2nk3
logs-2017.12.23 2 r UNASSIGNED
logs-2017.12.23 4 p STARTED 12264 5.6mb 127.0.0.1 adC2nk3
logs-2017.12.23 4 r UNASSIGNED
logs-2017.12.23 3 p STARTED 11956 5.4mb 127.0.0.1 adC2nk3
logs-2017.12.23 3 r UNASSIGNED
logs-2017.12.23 1 p STARTED 12091 5.3mb 127.0.0.1 adC2nk3
logs-2017.12.23 1 r UNASSIGNED
logs-2017.12.23 0 p STARTED 12147 5.5mb 127.0.0.1 adC2nk3
logs-2017.12.23 0 r UNASSIGNED
*Truncated*
# curl -XGET 'localhost:9200/_cluster/allocation/explain?pretty'
{
"index" : "logs-2018.01.25",
"shard" : 2,
"primary" : false,
"current_state" : "unassigned",
"unassigned_info" : {
"reason" : "CLUSTER_RECOVERED",
"at" : "2018-05-15T08:28:39.545Z",
"last_allocation_status" : "no_attempt"
},
"can_allocate" : "no",
"allocate_explanation" : "cannot allocate because allocation is not permitted to any of the nodes",
"node_allocation_decisions" : [
{
"node_id" : "adC2nk3KSPmL9c7zqiCiwA",
"node_name" : "adC2nk3",
"transport_address" : "127.0.0.1:9300",
"node_decision" : "no",
"deciders" : [
{
"decider" : "same_shard",
"decision" : "NO",
"explanation" : "the shard cannot be allocated to the same node on which a copy of the shard already exists [[logs-2018.01.25][2], node[abC2nk3KSPmL9c7zqiCiwA], [P], s[STARTED], a[id=dRx2RAW7RTaIaUxKym45Qg]]"
}
]
}
]
}
# curl -XGET 'localhost:9200/_cluster/health?pretty'
{
"cluster_name" : "elasticsearch",
"status" : "red",
"timed_out" : false,
"number_of_nodes" : 1,
"number_of_data_nodes" : 1,
"active_primary_shards" : 2142,
"active_shards" : 2142,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 2143,
"delayed_unassigned_shards" : 0,
"number_of_pending_tasks" : 0,
"number_of_in_flight_fetch" : 0,
"task_max_waiting_in_queue_millis" : 0,
"active_shards_percent_as_number" : 49.98833138856476
}
# curl -XGET 'localhost:9200/_cat/health?v'
epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1526387475 14:31:15 elasticsearch red 1 1 2142 2142 0 0 2143 0 - 50.0%
# curl -s 'localhost:9200/_cat/allocation?v'
shards disk.indices disk.used disk.avail disk.total disk.percent host ip node
2142 42.2gb 56.1gb 93.8gb 150gb 37 127.0.0.1 127.0.0.1 adC2nk3
2143 UNASSIGNED
```
---
### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [May 21, 2018, 2:07pm UTC](https://discuss.elastic.co/t/unhealthy-cluster/132664/2 "2018-05-21T14:07:46Z")
The fact that replica shards are unassigned is not a problem as you only have a single node. Elasticsearch will never allocate a replica to the same node that holds the primary.
You do however have a lot of very small shards, which is inefficient. Read [this blog post](https://www.elastic.co/blog/how-many-shards-should-i-have-in-my-elasticsearch-cluster) for some practical guidance around sharding.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 19, 2018, 9:29am UTC](https://discuss.elastic.co/t/unhealthy-cluster/132664/4 "2018-06-19T09:29:24Z")
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