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We have a couple of ec2 instances on amazon, and we used amazon AIM Linux to set up. The instance type is m1.medium.
Everything is going well until this week.
We found from log file that there would be a huge clock drift happened suddenly, and sometimes there has a 5-minutes discrepancy。
I would like to ask if anyone else encounter this problem? How to deal with it?
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Amazon Time Sync is used by EC2 instances and other AWS services. It uses a fleet of redundant satellite-connected and atomic clocks in each Region to deliver time derived from these highly accurate reference clocks. This service is provided at no additional charge.
After verifying the policy setting, you can change the time zone from the Command Prompt window. Run a Command Prompt window as Administrator. Enter time or date in the Command Prompt window, then select OK. Enter the new time or date at the prompt.
Amazon Inspector is an automated security assessment service that helps improve the security and compliance of applications deployed on AWS. Amazon Inspector automatically assesses applications for exposure, vulnerabilities, and deviations from best practices.
On the AWS Elemental Server web interface, go to the Settings page and choose General. In Timezone, choose your required time zone. Choose Update.
Time drift can occur due to over utilization of your instances resources. I would encourage you to check you cloudwatch CPU graphs to try identify if your CPU was being over utilized.
If you are running amazon linux AMI, NTP is installed by default.
To verify if NTP is running run
sudo service ntpd status
If it is not installed you can run the following to install it:
sudo yum install ntp
If NTPD is running and your clock time is off I would try to restart it and see if it synchs with the NTP servers your have setup. You can also add more NTP servers by editing the /etc/ntp.conf file. Just search for NTP servers to find ones to add.
199
Yes, best not to trust the system clock. Just install and configure NTP.
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