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Add VM informant to vm-compute-node (#3324)

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The general idea is that the VM informant binary is added to the
vm-compute-node images only. `compute_tools` then will run whatever's at
`/bin/vm-informant`, if the path exists.
This commit is contained in:
sharnoff
2023-01-16 15:05:29 +00:00
committed by GitHub
parent 84ffdc8b4f
commit 5c6a7a17cb
5 changed files with 78 additions and 1 deletions
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compute_tools/README.md
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@@ -19,6 +19,10 @@ Also `compute_ctl` spawns two separate service threads:
- `http-endpoint` runs a Hyper HTTP API server, which serves readiness and the
last activity requests.
If the `vm-informant` binary is present at `/bin/vm-informant`, it will also be started. For VM
compute nodes, `vm-informant` communicates with the VM autoscaling system. It coordinates
downscaling and (eventually) will request immediate upscaling under resource pressure.
Usage example:
```sh
compute_ctl -D /var/db/postgres/compute \