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If you use the AWS CLI or an AWS SDK to make requests from your instance, these tools sign requests on your behalf.If your instance's date and time are not set correctly, the date in the signature may not match the date of the request, and AWS rejects the request.You will want to become familiar with ntpq as it will give you a command line equivalent of a management console.I would suggest using ntpq with the -n option to disable DNS resolution so that you can see the actual ip addresses being [email protected]:~$ su hduser Password: [email protected]:~$ ssh-keygen -t rsa -P "" Generating public/private rsa key pair. ECDSA key fingerprint is e1:8b:a0:a:ef:f4:b4:5e:a9:ed:be:64:be:5c:2f. Are you sure you want to continue connecting (yes/no)?Enter file in which to save the key (/home/hduser/.ssh/id_rsa): Created directory '/home/hduser/.ssh'. yes Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
Perhaps there's a problem getting the correct time from the Internet, which is enabled or disabled from the first "Set time automatically" option.In addition, your instance's security group rules must allow outbound UDP traffic on port 123 (NTP), and your network ACL rules must allow both inbound and outbound UDP traffic on port 123.The procedures in this section show how to verify that the default NTP configuration is working correctly.If your instance does not have access to the Internet, you need to configure NTP to query a different server in your private network to keep accurate time.
Some of this may be automatic, but knowing how to make the manual changes for specific NTP servers would be a good thing.
Your identification has been saved in /home/hduser/.ssh/id_rsa. Welcome to Ubuntu 14.04.1 LTS (GNU/Linux 3.13.0-40-generic x86_64) ...