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Fix HAProxy draining (#1993) (#2198)

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* Fix HAProxy draining by manually entering the 'MAINT' state

Inspired by rldleblanc: https://github.com/ansible/ansible/issues/37591#issuecomment-610130611

Signed-off-by: Norman Ziegner <norman.ziegner@ufz.de>

* Add changelog fragment

Signed-off-by: Norman Ziegner <norman.ziegner@ufz.de>

* Fix drain function docstring

Signed-off-by: Norman Ziegner <norman.ziegner@ufz.de>

* Fix typos

Signed-off-by: Norman Ziegner <norman.ziegner@ufz.de>

* Update changelog fragment

Signed-off-by: Norman Ziegner <norman.ziegner@ufz.de>
(cherry picked from commit 7145204594)

Co-authored-by: Norman Ziegner <normo157@gmail.com>
This commit is contained in:
patchback[bot] 2021-04-07 20:15:51 +02:00 committed by GitHub
parent bec6f732ad
commit 809cdda9ef
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2 changed files with 11 additions and 7 deletions
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3
changelogs/fragments/1993-haproxy-fix-draining.yml Normal file
View file

@ -0,0 +1,3 @@
---
bugfixes:
- haproxy - fix a bug preventing haproxy from properly entering ``DRAIN`` mode (https://github.com/ansible-collections/community.general/issues/1913).

15
plugins/modules/net_tools/haproxy.py
View file

@ -367,10 +367,9 @@ class HAProxy(object):
# We can assume there will only be 1 element in state because both svname and pxname are always set when we get here
# When using track we get a status like this: MAINT (via pxname/svname) so we need to do substring matching
if status in state[0]['status']:
if not self._drain or (state[0]['scur'] == '0' and 'MAINT' in state):
if not self._drain or state[0]['scur'] == '0':
return True
else:
time.sleep(self.wait_interval)
time.sleep(self.wait_interval)
self.module.fail_json(msg="server %s/%s not status '%s' after %d retries. Aborting." %
(pxname, svname, status, self.wait_retries))
@ -409,15 +408,17 @@ class HAProxy(object):
def drain(self, host, backend, status='DRAIN'):
"""
Drain action, sets the server to DRAIN mode.
In this mode mode, the server will not accept any new connections
In this mode, the server will not accept any new connections
other than those that are accepted via persistence.
"""
haproxy_version = self.discover_version()
# check if haproxy version suppots DRAIN state (starting with 1.5)
# check if haproxy version supports DRAIN state (starting with 1.5)
if haproxy_version and (1, 5) <= haproxy_version:
cmd = "set server $pxname/$svname state drain"
self.execute_for_backends(cmd, backend, host, status)
self.execute_for_backends(cmd, backend, host, "DRAIN")
if status == "MAINT":
self.disabled(host, backend, self.shutdown_sessions)
def act(self):
"""
@ -426,7 +427,7 @@ class HAProxy(object):
# Get the state before the run
self.command_results['state_before'] = self.get_state_for(self.backend, self.host)
# toggle enable/disbale server
# toggle enable/disable server
if self.state == 'enabled':
self.enabled(self.host, self.backend, self.weight)
elif self.state == 'disabled' and self._drain: