On system rollback and totalised fields: An algebraic approach to system change
february 2012 by bpo
"In system operations the term rollback is often used to imply that arbitrary changes can be reversed i.e. ‘rolled back’ from an erroneous state to a previously known acceptable state. We show that this assumption is flawed and discuss error-correction schemes based on absolute rather than relative change."
"By formulating this problem algebraically, the discussion is distanced from the sometimes emotional standpoints that bind system administrators to the notion of rollback: desperately wanting does not make it possible. The discussion about totalisation of fields is particularly useful, as it maps nicely to the flaws in this thinking. To deal with the inverse of a many-to-one map, one must invoke a policy or arbitrary selection."
paper
deployment
cfengine
automation
"By formulating this problem algebraically, the discussion is distanced from the sometimes emotional standpoints that bind system administrators to the notion of rollback: desperately wanting does not make it possible. The discussion about totalisation of fields is particularly useful, as it maps nicely to the flaws in this thinking. To deal with the inverse of a many-to-one map, one must invoke a policy or arbitrary selection."
february 2012 by bpo
Research Systems Unix Group: radmind
november 2009 by bpo
At its core, radmind operates as a tripwire. It is able to detect changes to any managed filesystem object, e.g. files, directories, links, etc. However, radmind goes further than just integrity checking: once a change is detected, radmind can optionally reverse the change.
Each managed machine may have its own loadset composed of multiple, layered overloads. This allows, for example, the operating system to be described separately from applications.
tools
sysadmin
deployment
unix
automation
cfengine
Each managed machine may have its own loadset composed of multiple, layered overloads. This allows, for example, the operating system to be described separately from applications.
november 2009 by bpo
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