# Using an AWS EC2 as a Cosmos Node

**URL:** <https://forum.cosmos.network/t/using-an-aws-ec2-as-a-cosmos-node/845>\
**Category:** Validation\
**Created:** [September 14, 2018, 3:56pm UTC](https://forum.cosmos.network/t/using-an-aws-ec2-as-a-cosmos-node/845 "2018-09-14T15:56:05Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![katernoir](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.cosmos.network/katernoir/32/96_2.png) [@katernoir](https://forum.cosmos.network/u/katernoir)\
**Post date:** [September 16, 2018, 11:37am UTC](https://forum.cosmos.network/t/using-an-aws-ec2-as-a-cosmos-node/845/2 "2018-09-16T11:37:31Z")

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Very good writeup for beginners who want to join the testnet! Just a slight comment on opening ports for Cosmos: You don’t need to open port 26657 to the public. If you’re running sentry nodes, this should actually be avoided, because it opens access to the RPC and therefore could leak the IP address of your validator node. [Here](https://forum.cosmos.network/t/what-ports-does-gaiad-use/444) is a good thread about what ports gaiad is using and if they should be opened or not.

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