AWS ssh access 'Permission denied (publickey)' issue [closed]

Question

How to connect to a AWS instance through ssh?

I have:

1. Signed up at AWS;
2. Created a public key and a certificate at AWS website and saved them to disk;

3. Went to my console and created environment variables:

   $ export JAVA_HOME=/usr/lib/jvm/java-6-openjdk/ $ export EC2_CERT=/home/default/aws/cert-EBAINCRNWHDSCWWIHSOKON2YWGJZ5LSQ.pem $ export EC2_PRIVATE_KEY=/home/default/aws/pk-EBAINCRNWHDSCWWIHSOKON2YWGJZ5LSQ.pem 

4. Told AWS API to use this keypair and saved the keypair to file:

   $ ec2-add-keypair ec2-keypair > ec2-keypair.pem 

5. Started an AWS Ubuntu 9 instance using this keypair:

   $ ec2-run-instances ami-ed46a784 -k ec2-keypair 

6. Attempted to establish a ssh connection to the instance:

   $ ssh -v -i ec2-keypair.pem [email protected] OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to ec2-174-129-185-190.compute-1.amazonaws.com [174.129.185.190] port 22. debug1: Connection established. debug1: identity file ec2-keypair.pem type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.1p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 none debug1: kex: client->server aes128-cbc hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'ec2-174-129-185-190.compute-1.amazonaws.com' is known and matches the RSA host key. debug1: Found key in /home/default/.ssh/known_hosts:11 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Trying private key: ec2-keypair.pem debug1: read PEM private key done: type RSA debug1: Authentications that can continue: publickey debug1: No more authentication methods to try. Permission denied (publickey). 

   What could be the problem and how to make it work?

Answer 1

For Ubuntu instances:

chmod 600 ec2-keypair.pem ssh -v -i ec2-keypair.pem [email protected] 

For other instances, you might have to use ec2-user instead of ubuntu.

Most EC2 Linux images I've used only have the root user created by default.

See also: http://www.youtube.com/watch?v=WBro0TEAd7g