[WIP] Solve some concurrency issues #621
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nvgoldin
commented
Jul 1, 2017
nvgoldin
commented
- Use uuid4 instead of uuid1, so we do not give the same network names in parallel runs.
- Let libvirt generate the bridge name - here I think I hit occasionally a race condition in libvirt(one run complains the bridge name already exists, because the other process just created it). According to libvirt docs the bridge name will be auto-generated, however it does not talk directly about parallel-safety. If indeed this an issue, we'll have to generate the bridge name too, which will be little more constrained than the network names because it has a lower limitation on the number of chars(16 iirc).
nvgoldin
commented
Jul 1, 2017
lago/virt.py
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| str: prefixed identifier for the given unprefixed name | ||
| str: prefixed identifier for the given unprefixed name, with all | ||
| none alphanumeric characters in the unprefixed name replaced | ||
| with a 'L' |
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Note to self - probably better replacing it with a random char.
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ci test please |
Until now the prefix uuid was generated with 'uuid1' command. In cases where you started two environments with the same network names - the uuid1 usage caused us to pass the same network name to libvirt, despite the environments being different, thus throwing a libvirt error. The reason is that we truncated the 8 last bytes of the uuid1 and joined that with the network name. The 8 last bytes of uuid1 are most definitely not random. I see no reason to have the uuid not completely random - therefore this patch changes the prefix uuid to be generated with uuid4, which should be completely random. Signed-off-by: Nadav Goldin <ngoldin@redhat.com>
This patch changes the 'prefixed_name' function logic, so it will generate unique names, based on the Prefix UUID4 and the SHA256 hash of the passed name. This is required as we use those names in passed network names to libvirt. Signed-off-by: Nadav Goldin <ngoldin@redhat.com>
Signed-off-by: Nadav Goldin <ngoldin@redhat.com>
Signed-off-by: Nadav Goldin <ngoldin@redhat.com>
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