{"id":15209,"date":"2014-08-19T15:32:31","date_gmt":"2014-08-19T10:02:31","guid":{"rendered":"https:\/\/2thenew.xyz\/blog\/?p=15209"},"modified":"2016-11-29T17:44:23","modified_gmt":"2016-11-29T12:14:23","slug":"change-ssh-key-pair-of-running-ec2-instance","status":"publish","type":"post","link":"https:\/\/2thenew.xyz\/blog\/change-ssh-key-pair-of-running-ec2-instance\/","title":{"rendered":"Change ssh key-pair of Running EC2 Instance"},"content":{"rendered":"

Sometimes we get the requirement to change the key-pair for some security reasons. In this article, we will be changing the key pair of running EC2 instances.<\/p>\n

Steps:<\/h3>\n

1. Create a new key pair from AWS Console.
\n2. Generate Public key from newly created key pair ( Private Key ).
\n3. Paste the generated public key ( from Step 2 ) in ~\/.ssh\/authorized_keys of Server.
\n4. Delete the existing key from ~\/.ssh\/authorized_keys of Server
\n5. Perform ssh using new key.<\/p>\n

I have a running EC2 Instance ( Ubuntu 14.04 ) having key-pair “testing-key”.<\/p>\n

\"Screenshot<\/a><\/p>\n

Let’s change the key<\/p>\n

1. Create a new key pair from AWS Console<\/h4>\n

\"Screenshot<\/a><\/p>\n

This is a private key that you have to download on your local machine.<\/p>\n

2. Generate Public Key from Private Key (testing-ssh-key)<\/h4>\n

Execute<\/p>\n

[js]"$ ssh-keygen -y"[\/js]<\/p>\n

and provide the path for private key.
\nHere “testing-ssh-key.pem” is the new private key<\/p>\n

\"Screenshot<\/a><\/p>\n

3. Append the above generated public key to ~\/.ssh\/authorized_keys<\/h4>\n

4. Remove the old key from ~\/.ssh\/authorized_keys ( “testing-key.pem” )<\/h4>\n

5. Perform ssh using new key<\/h4>\n

[js]
\n$ ssh -i testing-ssh-key.pem ubuntu@X.X.X.X
\n[\/js]<\/p>\n

You can now log in using new key.<\/p>\n

\"Screenshot<\/a><\/p>\n

Read more about our D<\/a>evOps AWS<\/a> capabilities.<\/span><\/p>\n

Note: This article is not for changing key-pair if it is lost or deleted. Before performing below actions, it is advisable to take the backup of existing EC2 Instance.<\/p>\n","protected":false},"excerpt":{"rendered":"

Sometimes we get the requirement to change the key-pair for some security reasons. In this article, we will be changing the key pair of running EC2 instances. Steps: 1. Create a new key pair from AWS Console. 2. Generate Public key from newly created key pair ( Private Key ). 3. Paste the generated public […]<\/p>\n","protected":false},"author":100,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":381,"footnotes":""},"categories":[1174,2348],"tags":[2366,1555,3233,1892,1556,1498,553],"class_list":["post-15209","post","type-post","status-publish","format-standard","hentry","category-aws-2","category-devops-technology","tag-aws-devops","tag-aws-amazon-web-services","tag-cloud-devops","tag-devops","tag-ec2-instance","tag-key-pair","tag-ssh"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t