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3184 Commits

Author SHA1 Message Date
Joshua Boniface 2deee9a329 Lint: E262 inline comment should start with '# ' 2020-11-06 19:03:30 -05:00
Joshua Boniface 76b1cafdcc Lint: W605 invalid escape sequence '\$' 2020-11-06 19:01:22 -05:00
Joshua Boniface 639937f9c2 Lint: W605 invalid escape sequence '\^' 2020-11-06 18:59:30 -05:00
Joshua Boniface 63f4f9aed7 Lint: E722 do not use bare 'except' 2020-11-06 18:55:10 -05:00
Joshua Boniface 601ab1a181 Add second default too 2020-11-04 23:53:56 -05:00
Joshua Boniface 2266438303 Show fewer lines on a log follow 2020-11-03 11:16:29 -05:00
Joshua Boniface b783588ee6 Use "none" default instead of "default" 2020-10-29 12:19:07 -04:00
Joshua Boniface 56ba7b1457 Bump version to 0.9.1 2020-10-29 12:16:38 -04:00
Joshua Boniface e984f315f1 Correct bug in finding system template list 2020-10-29 12:14:10 -04:00
Joshua Boniface ec0b8acf90 Support per-VM migration type selectors 
Allow a VM to specify its migration type as a default choice. The valid
options are "default" (i.e. behave as now), "live" which forces a live
migration only, and "shutdown" which forces a shutdown migration only.
The new option is treated as a VM meta option and is set to default if
not found.
 2020-10-29 12:01:29 -04:00
Joshua Boniface d2c0d868c4 Add gevent to node daemon 
Required for the Metadata API instance.
 2020-10-27 02:42:49 -04:00
Joshua Boniface d63e757c32 Ensure args are checked against form body 
Required for XML definitions but erroneously removed during file parsing
reworking.
 2020-10-27 02:30:59 -04:00
Joshua Boniface 5d08ad9573 Fix incorrect keepalive interval setting 2020-10-26 11:44:45 -04:00
Joshua Boniface 81141c9b93 Include 0.9.0 changelog entries 2020-10-26 02:20:18 -04:00
Joshua Boniface 0f299777f1 Modify version to 3-digit numbering 
I expect 0.9 will be fairly long-lived, so add another decimal place so
I may continue adding tweaks to it.

THIS IS NOT SEMVER.
 2020-10-26 02:13:11 -04:00
Joshua Boniface fbbdb209c3 Remove Python OpenSSL dependency 
Not actually required for the SSL configuration.
 2020-10-26 02:02:15 -04:00
Joshua Boniface f85c2c2a75 Remove PyWSGI and move to Flask server 
Gevent was completely failure. The API would block during large file
uploads with no obvious solutions beyond "use gunicorn", which is not
suited to this. I originally had this working with the Flask "debug"
server, so just move to using that all the time. SSL is added using a
custom context with the OpenSSL library, so include that as a
dependency.
 2020-10-26 01:58:43 -04:00
Joshua Boniface adfe302f71 Move monkeypatch before all imports 2020-10-24 20:53:44 -04:00
Joshua Boniface 890023cbfc Make sender wait dynamic based on receiver 2020-10-21 14:43:54 -04:00
Joshua Boniface 28abb018e3 Improve some timeouts and conditionals 2020-10-21 12:00:10 -04:00
Joshua Boniface d42bb74dc9 Use explicit acquire/release instead of with 
The with blocks did not seem to work as expected. Go back to exclusive
locks as well since these are more consistent.
 2020-10-21 11:38:23 -04:00
Joshua Boniface 42c5f84ba7 Do multiple lock attempts 2020-10-21 11:21:37 -04:00
Joshua Boniface 88556f4a33 Convert from exclusive to write lock 2020-10-21 11:12:36 -04:00
Joshua Boniface 017953c2e6 Move lock release to phase D 2020-10-21 11:07:01 -04:00
Joshua Boniface 82b4d3ed1b Add missing prefix statements to loggers 2020-10-21 10:52:53 -04:00
Joshua Boniface 3839040092 Add exclusive lock function 2020-10-21 10:46:41 -04:00
Joshua Boniface bae366a316 Add waits and only receive check on send 2020-10-21 10:43:42 -04:00
Joshua Boniface 84ade53fae Add locks for VM state changes 
Use exclusive locks during API events which change VM state. This is
fairly critical to avoid potential duplicate updates. Only implemented
for these specifically required functions to avoid major performance
hits elsewhere.
 2020-10-21 10:40:00 -04:00
Joshua Boniface 72f47f216a Revert "Add locking in common zkhander" 
This reverts commit 53c0d2b4f6.

This resulted in a massive performance hit and some inconsistent
behaviour. Revert for now an re-investigate later.
 2020-10-21 03:49:13 -04:00
Joshua Boniface 9bfcab5e2b Improve documentation around n-1 situations 
Closes #104
 2020-10-21 03:30:33 -04:00
Joshua Boniface 53c0d2b4f6 Add locking in common zkhander 
Ensures that every changed made here is locked, thus preventing
duplicate updates, etc.
 2020-10-21 03:17:18 -04:00
Joshua Boniface 351076c15e Check if node changed during final check 
Avoids situations where two migrates, to different nodes, happen in
rapid succession. Aborts the migration if the current target node no
longer matches what was set at the start of the execution.
 2020-10-21 02:52:36 -04:00
Joshua Boniface 42514b9a50 Improve messages further 2020-10-21 02:41:42 -04:00
Joshua Boniface 611e47f338 Add messages to migration aborts 
Results in some information duplication, but ensures logging of the
reason a migration was aborted separate from the error(s) this may
generate.
 2020-10-21 02:38:42 -04:00
Joshua Boniface d96a23276b Mention recommendations about system disks 
Advise SSDs always, mention the situations where slower media can be
acceptable and the risks therein.
 2020-10-21 02:31:09 -04:00
Joshua Boniface 1523959074 Move where setting last_ vars happens 2020-10-21 02:24:00 -04:00
Joshua Boniface ef762359f4 Adjust timing to avoid migrating to self quickly 
Add another separate state lock, release it earlier, and ensure timings
are good to avoid double-migrating one VM.
 2020-10-21 02:17:55 -04:00
Joshua Boniface 398d33778f Avoid stopping duplicates, just lock our own key 2020-10-20 16:10:39 -04:00
Joshua Boniface a6d492ed9f Remove spurious writes and adjust sleep 2020-10-20 16:04:26 -04:00
Joshua Boniface 11fa3b0df3 Remove additional wait and add last_node entries 
These allow for aborting a migration to retain the previous settings and
override what the client set.
 2020-10-20 15:58:55 -04:00
Joshua Boniface 442aa4e420 Tweak timers further 2020-10-20 15:43:59 -04:00
Joshua Boniface 3910843660 Add missing break 2020-10-20 15:39:29 -04:00
Joshua Boniface 70f3fdbfb9 Tweak the delays slightly on receive 2020-10-20 15:38:07 -04:00
Joshua Boniface 7cb0241a12 Attempt live migrates 3 times before proceeding 2020-10-20 15:33:41 -04:00
Joshua Boniface 9fb33ed7a7 Increase peer lock acquiring timers 2020-10-20 15:26:59 -04:00
Joshua Boniface abfe0108ab Better handle aborting migrations 2020-10-20 15:22:16 -04:00
Joshua Boniface 567fe8f36b Wait for existing migrations before proceeding 2020-10-20 15:12:32 -04:00
Joshua Boniface ec7b78b9b8 Add additional short sleep in receive 2020-10-20 13:29:17 -04:00
Joshua Boniface 224c8082ef Alter text of synchronization messages 2020-10-20 13:08:18 -04:00
Joshua Boniface f9e7e9884f Improve handling of VM migrations 
The VM migration code was very old, very spaghettified, and prone to
strange failures.

Improve this by taking cues from the node primary migration. Use
synchronization between the nodes to ensure lockstep completion of the
migration in discrete steps.

A proper queue can be built later to integrate with this code more
cleanly.

References #108
 2020-10-20 13:01:55 -04:00