# Did elasticsearch cluster name includes special characters **URL:** \ **Category:** Elasticsearch\ **Created:** [September 11, 2020, 1:18pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329 "2020-09-11T13:18:43Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![chandu2](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@chandu2](https://discuss.elastic.co/u/chandu2)\ **Post date:** [September 11, 2020, 1:18pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/1 "2020-09-11T13:18:43Z")
Did elasticsearch cluster name includes special characters. If Iam including I am getting error. Please anyone clarify on this. How can I use special characters also ---
**Author:** ![Peter\_Steenbergen](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/peter_steenbergen/32/22888_2.png) [@Peter\_Steenbergen](https://discuss.elastic.co/u/Peter_Steenbergen)\ **Post date:** [September 11, 2020, 1:39pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/2 "2020-09-11T13:39:32Z")
I always thought that the cluster.name setting found on [https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster.name.html#cluster.name](https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster.name.html#cluster.name) always must consist of alphanumeric characters and dash/underscore. What characters are you trying to use? ---
**Author:** ![chandu2](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@chandu2](https://discuss.elastic.co/u/chandu2)\ **Post date:** [September 11, 2020, 1:56pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/3 "2020-09-11T13:56:16Z")
I am using default\_elastic. I am getting error ---
**Author:** ![Peter\_Steenbergen](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/peter_steenbergen/32/22888_2.png) [@Peter\_Steenbergen](https://discuss.elastic.co/u/Peter_Steenbergen)\ **Post date:** [September 11, 2020, 1:58pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/4 "2020-09-11T13:58:28Z")
Can you share the error? ---
**Author:** ![chandu2](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@chandu2](https://discuss.elastic.co/u/chandu2)\ **Post date:** [September 11, 2020, 2:08pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/5 "2020-09-11T14:08:17Z")
Yes. Below is the error I am getting: The Elasticsearch "default\_elastic" is invalid: metadata.name: Invalid value: "default\_elastic": a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. '[example.com](http://example.com)', regex used for validation is 'a-z0-9?(.a-z0-9?)\*') ---
**Author:** ![Peter\_Steenbergen](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/peter_steenbergen/32/22888_2.png) [@Peter\_Steenbergen](https://discuss.elastic.co/u/Peter_Steenbergen)\ **Post date:** [September 11, 2020, 2:53pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/6 "2020-09-11T14:53:47Z")
Are you using it on kubernetes by any chance? It looks like that, and it is not an elastic thing but more a k8s thing. For instance: > You can use the characters a-z or "-" or a "." but no other characters. ---
**Author:** ![chandu2](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@chandu2](https://discuss.elastic.co/u/chandu2)\ **Post date:** [September 11, 2020, 3:17pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/7 "2020-09-11T15:17:35Z")
Yes, I am using it in kubernetes. Thank you ---
**Author:** ![Steve\_Mushero](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/steve_mushero/32/22441_2.png) [@Steve\_Mushero](https://discuss.elastic.co/u/Steve_Mushero)\ **Post date:** [September 12, 2020, 4:06am UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/8 "2020-09-12T04:06:52Z")
Looks like it is using the same name for the 'host' and node, and since they have to be DNS names, cannot use underscore. Just use dash. Annoying, I know. ---
**Author:** ![chandu2](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@chandu2](https://discuss.elastic.co/u/chandu2)\ **Post date:** [September 14, 2020, 10:03am UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/9 "2020-09-14T10:03:56Z")
Is there any way to use underscores with Capital letters for cluster name. Thanks in advance ---
**Author:** ![Peter\_Steenbergen](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/peter_steenbergen/32/22888_2.png) [@Peter\_Steenbergen](https://discuss.elastic.co/u/Peter_Steenbergen)\ **Post date:** [September 14, 2020, 11:52am UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/10 "2020-09-14T11:52:00Z")
No I do not think that it is possible, it has to follow the RFC guidelines. ---
**Author:** ![chandu2](https://avatars.discourse-cdn.com/v4/letter/c/ee7513/32.png) [@chandu2](https://discuss.elastic.co/u/chandu2)\ **Post date:** [September 14, 2020, 12:50pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/11 "2020-09-14T12:50:19Z")
okay. Thank you ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [October 12, 2020, 12:50pm UTC](https://discuss.elastic.co/t/did-elasticsearch-cluster-name-includes-special-characters/248329/12 "2020-10-12T12:50:24Z")
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