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vesion-specific upgrade guide for 1.0.3 and 0.12.10

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Chris Baker 2021-01-29 19:41:48 +00:00
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website/content/docs/upgrade/upgrade-specific.mdx
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@ -14,6 +14,31 @@ upgrade. However, specific versions of Nomad may have more details provided for
their upgrades as a result of new features or changed behavior. This page is
used to document those details separately from the standard upgrade flow.
## Nomad 1.0.3, 0.12.10
Nomad versions 1.0.3 and 0.12.10 change the behavior of the `exec` and `java` drivers so that
tasks are isolated in their own PID and IPC namespaces. As a result, the
process launched by these drivers will be PID 1 in the namespace. This has
[significant impact](https://man7.org/linux/man-pages/man7/pid_namespaces.7.html)
on the treatment of a process by the Linux kernel. Furthermore, tasks in the
same allocation will no longer be able to coordinate using signals, SystemV IPC
objects, or POSIX message queues. Operators should weigh potential impact of an
upgrade on their applications against the security consequences inherent in using
the host namespaces.
This is the sole change for Nomad 1.0.3, intended to provide better process
isolation by default. An upcoming version of Nomad will include options for
configuring this behavior.
This change is limited to the `exec` and `java` driver plugins. It does not affect
the Nomad server. This only affect Nomad clients running on Linux, using the
`exec` or `java` drivers or third-party driver plugins which relied on the shared
Nomad executor library.
Upgrading a Nomad client to 1.0.3 or 0.12.10 will not restart existing tasks.
As such, processes from existing `exec`/`java` tasks will need to be manually restarted
(using `alloc stop` or another mechanism) in order to be fully isolated.
## Nomad 1.0.2
#### Dynamic secrets trigger template changes on client restart