You can find Jenkins initial password from the EC2 management console System Log.
- Go to Amazon EC2 console at https://console.aws.amazon.com/ec2/.
- Chose your Instance and Click Actions → Instance Settings → Get System log
You can also SSH into your instance and find the login credential using the following command.
$ cat /home/ubuntu/credentials ////////////////////credentials info//////////////////// --- Jenkins ----- User: admin ----- Password : 70f34bba9ef44c44b44f059509a0f348 ////////////////////////////////////////////////////////