| #!/bin/bash -ex | |
| # Build a new Centos8 install on EBS volume in a chroot | |
| # Run from RHEL8 or CentOS8 instance - eg: ami-0c322300a1dd5dc79 in us-east-1 (RHEL 8 official image) | |
| # Script expects a second EBS volume, I add them as /dev/sdf in the console | |
| # When the script completes, turn the second EBS volume into your new AMI through the console. | |
| # Adjust the section below to match the device names you're using. Defaults are for an m5.large | |
| # m5 series requires the updated device names |
For more background, see https://alan.ivey.dev/posts/2020/creating-an-ami-for-arm/.
Install Packer 1.5 or higher (template developed against v1.5.6). Ensure you have appropriate permissions for creating AMIs with Packer and Packer can access in your shell environment.
Build:
packer build centos8.pkr.hcl
To limit a CPU to a certain C-state, you can pass the processor.max_cstate=X option in the kernel line of /boot/grub/grub.conf.
Here we limit the system to only C-State 1:
kernel /vmlinuz-2.6.18-371.1.2.el5 ... processor.max_cstate=1
On some systems, the kernel can override the BIOS setting, and the parameter intel_idle.max_cstate=0 may be required to ensure sleep states are not entered:
Just run this from your Mac terminal and it'll drop you in a container with full permissions on the Docker VM. This also works for Docker for Windows for getting in Moby Linux VM (doesn't work for Windows Containers).
docker run -it --rm --privileged --pid=host justincormack/nsenter1
more info: https://github.com/justincormack/nsenter1