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Joined 1 year ago
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Cake day: June 20th, 2023

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  • Depends on specific machine setup and how good the backup is.

    Backup requirements for /usr there are sticky bits set on some binaries. That needs to be preserved. In all cases soft links likely need to be preserved for things to work correctly on future package installs. Hard links can be problematic, but if you have a large enough drive or not that many it wont matter. Running package verification can be help after restore to make sure everything looks right. If running a Linux system with SELinux in enforcing mode (RHEL on many derivatives), then the security context will also need to be preserved BUT running a relabel will probably work if the security context was not included in backups. Sometimes running the relabel process wont work if there are files that needs a specific security context but are not listed in the security context database. Can’t provide more details because most of my experience with that is on systems we just replace (LSPP custom labeling resulted in systems that if you booted into permissive would then be unbootable, so they were just reinstalled once any debugging was done).

    For /boot things can get tricky depending on the distribution, what boot manager is used, and /boot was a separate partition or not. Basically the boot manager (probably grub) needs to know how to find the files in boot so it can load the kernel. In most cases if you restore /boot and rerun the tools to update the boot manger everything will be fine. BUT some distributions, hardware setups, or dual boot configurations are more complicated, so extra work might be needed.

    You didn’t mention /dev, which is all special files. These don’t need to be restored, just make sure the right processes recreate them. There are tools to do this, hopefully the packages are installed. Or boot from a rescue disk and fix it. Look up instruction for your specific distro.





  • Depends on environment.

    Real hardware separate for a server partitions for: /home, /var, swap, sometimes /usr, sometimes /var/log/audit Depends on deployment requirements, and if a system is expected to run after filling up audit.

    Real hardware for a at home desktop: /var, swap, maybe /home, or just one partition for / and one for swap.

    Cloud: all one partition, put swap in a file if it is needed. Cloud images are easy to grow if it is just one partition. Cloud-init will handle that automatically with the right packages installed, no configuration needed. Swap partitions are unlikely to be the right size as they vary according to memory and memory varies according to instance/guest sizes. Swap makes auto growing root partition harder (cloud-init custom config injection required). Best practice is to size workload and instances to not need swap whenever possible.





  • There have been ways to recycle organic waste into oil for decades. They even built a full sized plant to use turkey offal from a nearby turkey processor (initially could get it for free). Even ran demos on tire rubber or plastics. Initially cost effective when oil prices were high as they could sell the oil.

    Few of problems. Up front cost is high. Oil price volotility and the drop in oil prices made it uneconomic. Coupled with needing to pay for the turkey offal (someone else started paying the processor for it), killed the plant being fully self funded.

    Since then refinements in the process, or closely related ones, keep being developed without being able to overcome the economics. These processes can recycle from just about anything organic, including plastics, to whatever oil feedstock you want. Plastic as good as virgin plastics, pharmaceuticals, or whatever oil you want. Still the economics don’t work when oil is cheap and new oils societal costs are externalized.



  • I have not listened to the podcast unfortunately.

    Rebuilders are fine, and RedHat is fine to not spend the effort to debrand their source rpms. The problem is one of value. The value RedHat provides for some people is probably worth more than RedHat charges. The value RedHat provides to others is less than the effort it takes to renew a developer license once a year for 16 installs. The problem is that there are several who are ending support for RHEL because they fall into the latter group (notably Jeff Geerling for ansible roles). RHEL losing out on that support might be huge, might not, only time will tell.