- Usual security updates do not require a reboot on Linux... Updating can be done via the usual Debian-bases update mechanisms (
apt-getfor example). - If you want to upgrade the kernel and other part of the OS that cannot be upgraded easily (for example to Upgrade the Ubuntu version to a newer one; or if a security flaw is found in the kernel you use and you are vulnerable to it), the usual way is simply to reinstall the EC2 instances from scratch with a newer AMI image. This can be painful but the use of computer assisted deployment tools such as
Puppet,CFengineorChefcan make the task considerably simpler...
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Answer by Oct for ubuntu ec2 instance - apply security updates
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