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used ansible conventions to use trigered action ==> state,

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now only two states are available enabled/disabled_
get weight for backend server, is default behavior for both state,
supports set weight while enable server in lb pool
This commit is contained in:
Ravi Bhure 2014-12-05 11:44:43 -07:00
parent bcbe945a41
commit 44b2cdb5f2
1 changed files with 47 additions and 131 deletions
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176
network/haproxy.py
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@ -21,22 +21,26 @@
DOCUMENTATION = ''' DOCUMENTATION = '''
--- ---
module: haproxy module: haproxy
short_description: An Ansible module to handle actions enable/disable server and set/get weight from haproxy using socket commands. short_description: An Ansible module to handle states enable/disable server and set weight to backend host in haproxy using socket commands.
description: description:
- Enable/Diable Haproxy Backend Server, - The Enable Haproxy Backend Server, with
- Get/Set weight of Haproxy Backend Server, supports get current weight for server (default) and
using haproxy socket commands - http://haproxy.1wt.eu set weight for haproxy backend server when provides.
- The Disable Haproxy Backend Server, with
supports get current weight for server (default) and
shutdown sessions while disabling backend host server.
notes: notes:
- "enable or disable or set weight commands are restricted and can only be issued on sockets configured for level 'admin', " - "enable or disable commands are restricted and can only be issued on sockets configured for level 'admin', "
- "Check - http://haproxy.1wt.eu/download/1.5/doc/configuration.txt, " - "Check - http://haproxy.1wt.eu/download/1.5/doc/configuration.txt, "
- "Example: 'stats socket /var/run/haproxy.sock level admin'" - "Example: 'stats socket /var/run/haproxy.sock level admin'"
options: options:
action: state:
description: description:
- Action to take. - describe the desired state of the given host in lb pool.
required: true required: true
default: null default: null
choices: [ "enabled", "disabled", "get_weight", "set_weight" ] choices: [ "enabled", "disabled" ]
host: host:
description: description:
- Host (backend) to operate in Haproxy. - Host (backend) to operate in Haproxy.
@ -66,26 +70,25 @@ options:
''' '''
EXAMPLES = ''' EXAMPLES = '''
# disable backend server in 'www' backend examples:
- haproxy: action=disabled host={{ inventory_hostname }} backend=www
# disable backend server without backend name (applied to all) # disable server in 'www' backend pool
- haproxy: action=disabled host={{ inventory_hostname }} - haproxy: state=disabled host={{ inventory_hostname }} backend=www
# disable server without backend pool name (apply to all available backend pool)
- haproxy: state=disabled host={{ inventory_hostname }}
# disable server, provide socket file # disable server, provide socket file
- haproxy: action=disabled host={{ inventory_hostname }} socket=/var/run/haproxy.sock backend=www - haproxy: state=disabled host={{ inventory_hostname }} socket=/var/run/haproxy.sock backend=www
# disable backend server in 'www' backend and drop open sessions to it # disable backend server in 'www' backend pool and drop open sessions to it
- haproxy: action=disabled host={{ inventory_hostname }} backend=www shutdown_sessions=true - haproxy: state=disabled host={{ inventory_hostname }} backend=www socket=/var/run/haproxy.sock shutdown_sessions=true
# enable backend server in 'www' backend # enable server in 'www' backend pool
- haproxy: action=enabled host={{ inventory_hostname }} backend=www - haproxy: state=enabled host={{ inventory_hostname }} backend=www
# report a server's current weight in 'www' backend # enable server in 'www' backend pool with change server(s) weight
- haproxy: action=get_weight host={{ inventory_hostname }} backend=www - haproxy: state=enabled host={{ inventory_hostname }} socket=/var/run/haproxy.sock weight=10 backend=www
# change a server's current weight in 'www' backend
- haproxy: action=set_weight host={{ inventory_hostname }} backend=www weight=10
author: Ravi Bhure <ravibhure@gmail.com> author: Ravi Bhure <ravibhure@gmail.com>
version_added: "1.9" version_added: "1.9"
@ -104,14 +107,12 @@ def main():
ACTION_CHOICES = [ ACTION_CHOICES = [
'enabled', 'enabled',
'disabled', 'disabled',
'get_weight',
'set_weight'
] ]
# load ansible module object # load ansible module object
module = AnsibleModule( module = AnsibleModule(
argument_spec = dict( argument_spec = dict(
action = dict(required=True, default=None, choices=ACTION_CHOICES), state = dict(required=True, default=None, choices=ACTION_CHOICES),
host=dict(required=True, default=None), host=dict(required=True, default=None),
backend=dict(required=False, default=None), backend=dict(required=False, default=None),
weight=dict(required=False, default=None), weight=dict(required=False, default=None),
@ -121,7 +122,7 @@ def main():
supports_check_mode=True, supports_check_mode=True,
) )
action = module.params['action'] state = module.params['state']
host = module.params['host'] host = module.params['host']
backend = module.params['backend'] backend = module.params['backend']
weight = module.params['weight'] weight = module.params['weight']
@ -129,7 +130,7 @@ def main():
shutdown_sessions = module.params['shutdown_sessions'] shutdown_sessions = module.params['shutdown_sessions']
################################################################## ##################################################################
# Required args per action: # Required args per state:
# (enabled/disabled) = (host) # (enabled/disabled) = (host)
# #
# AnsibleModule will verify most stuff, we need to verify # AnsibleModule will verify most stuff, we need to verify
@ -137,16 +138,12 @@ def main():
################################################################## ##################################################################
if action in ['set_weight']:
if not weight:
module.fail_json(msg='no weight specified for action, require value in number')
################################################################## ##################################################################
if not socket: if not socket:
module.fail_json('unable to locate haproxy.sock') module.fail_json('unable to locate haproxy.sock')
################################################################## ##################################################################
required_one_of=[['action', 'host']] required_one_of=[['state', 'host']]
ansible_haproxy = HAProxy(module, **module.params) ansible_haproxy = HAProxy(module, **module.params)
if module.check_mode: if module.check_mode:
@ -173,7 +170,7 @@ class HAProxy(object):
def __init__(self, module, **kwargs): def __init__(self, module, **kwargs):
self.module = module self.module = module
self.action = kwargs['action'] self.state = kwargs['state']
self.host = kwargs['host'] self.host = kwargs['host']
self.backend = kwargs['backend'] self.backend = kwargs['backend']
self.weight = kwargs['weight'] self.weight = kwargs['weight']
@ -190,7 +187,6 @@ class HAProxy(object):
buffer = "" buffer = ""
self.client = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) self.client = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.client.connect(self.socket) self.client.connect(self.socket)
self.client.sendall('%s\n' % cmd) self.client.sendall('%s\n' % cmd)
@ -204,7 +200,7 @@ class HAProxy(object):
self.client.close() self.client.close()
return result return result
def enabled(self, host, backend): def enabled(self, host, backend, weight):
""" """
Enables backend server for a particular backend. Enables backend server for a particular backend.
@ -232,12 +228,16 @@ class HAProxy(object):
if 'BACKEND' in line: if 'BACKEND' in line:
result = line.split(',')[0] result = line.split(',')[0]
pxname = result pxname = result
cmd = "enable server %s/%s" % (pxname, svname) cmd = "get weight %s/%s ; enable server %s/%s" % (pxname, svname, pxname, svname)
if weight:
cmd += "; set weight %s/%s %s" % (pxname, svname, weight)
self.execute(cmd) self.execute(cmd)
else: else:
pxname = backend pxname = backend
cmd = "enable server %s/%s" % (pxname, svname) cmd = "get weight %s/%s ; enable server %s/%s" % (pxname, svname, pxname, svname)
if weight:
cmd += "; set weight %s/%s %s" % (pxname, svname, weight)
self.execute(cmd) self.execute(cmd)
def disabled(self, host, backend, shutdown_sessions): def disabled(self, host, backend, shutdown_sessions):
@ -273,117 +273,33 @@ class HAProxy(object):
if 'BACKEND' in line: if 'BACKEND' in line:
result = line.split(',')[0] result = line.split(',')[0]
pxname = result pxname = result
cmd = "disable server %s/%s" % (pxname, svname) cmd = "get weight %s/%s ; disable server %s/%s" % (pxname, svname, pxname, svname)
if shutdown_sessions: if shutdown_sessions == 'true':
cmd += "; shutdown sessions server %s/%s" % (pxname, svname) cmd += "; shutdown sessions server %s/%s" % (pxname, svname)
self.execute(cmd) self.execute(cmd)
else: else:
pxname = backend pxname = backend
cmd = "disable server %s/%s" % (pxname, svname) cmd = "get weight %s/%s ; disable server %s/%s" % (pxname, svname, pxname, svname)
if shutdown_sessions: if shutdown_sessions == 'true':
cmd += "; shutdown sessions server %s/%s" % (pxname, svname) cmd += "; shutdown sessions server %s/%s" % (pxname, svname)
self.execute(cmd) self.execute(cmd)
def get_weight(self, host, backend):
"""
Report a server's current weight.
get weight <backend>/<server>
Report the current weight and the initial weight of server <server> in
backend <backend> or an error if either doesn't exist. The initial weight is
the one that appears in the configuration file. Both are normally equal
unless the current weight has been changed. Both the backend and the server
may be specified either by their name or by their numeric ID, prefixed with a
sharp ('#').
Syntax: get weight <pxname>/<svname>
"""
svname = host
if self.backend is None:
output = self.execute('show stat')
#sanitize and make a list of lines
output = output.lstrip('# ').strip()
output = output.split('\n')
result = output
for line in result:
if 'BACKEND' in line:
result = line.split(',')[0]
pxname = result
cmd = "get weight %s/%s" % (pxname, svname)
self.execute(cmd)
else:
pxname = backend
cmd = "get weight %s/%s" % (pxname, svname)
self.execute(cmd)
def set_weight(self, host, backend, weight):
"""
Change a server's current weight.
set weight <backend>/<server> <weight>[%]
Change a server's weight to the value passed in argument. If the value ends
with the '%' sign, then the new weight will be relative to the initially
configured weight. Relative weights are only permitted between 0 and 100%,
and absolute weights are permitted between 0 and 256. Servers which are part
of a farm running a static load-balancing algorithm have stricter limitations
because the weight cannot change once set. Thus for these servers, the only
accepted values are 0 and 100% (or 0 and the initial weight). Changes take
effect immediately, though certain LB algorithms require a certain amount of
requests to consider changes. A typical usage of this command is to disable
a server during an update by setting its weight to zero, then to enable it
again after the update by setting it back to 100%. This command is restricted
and can only be issued on sockets configured for level "admin". Both the
backend and the server may be specified either by their name or by their
numeric ID, prefixed with a sharp ('#').
Syntax: set weight <pxname>/<svname>
"""
svname = host
weight = weight
if self.backend is None:
output = self.execute('show stat')
#sanitize and make a list of lines
output = output.lstrip('# ').strip()
output = output.split('\n')
result = output
for line in result:
if 'BACKEND' in line:
result = line.split(',')[0]
pxname = result
cmd = "set weight %s/%s %s" % (pxname, svname, weight)
self.execute(cmd)
else:
pxname = backend
cmd = "set weight %s/%s %s" % (pxname, svname, weight)
self.execute(cmd)
def act(self): def act(self):
""" """
Figure out what you want to do from ansible, and then do the Figure out what you want to do from ansible, and then do the
needful (at the earliest). needful (at the earliest).
""" """
# toggle enable/disbale server # toggle enable/disbale server
if self.action == 'enabled': if self.state == 'enabled':
self.enabled(self.host, self.backend) self.enabled(self.host, self.backend, self.weight)
elif self.action == 'disabled': elif self.state == 'disabled':
self.disabled(self.host, self.backend, self.shutdown_sessions) self.disabled(self.host, self.backend, self.shutdown_sessions)
# toggle get/set weight
elif self.action == 'get_weight':
self.get_weight(self.host, self.backend)
elif self.action == 'set_weight':
self.set_weight(self.host, self.backend, self.weight)
# wtf?
else: else:
self.module.fail_json(msg="unknown action specified: '%s'" % \ self.module.fail_json(msg="unknown state specified: '%s'" % \
self.action) self.state)
self.module.exit_json(stdout=self.command_results, changed=True) self.module.exit_json(stdout=self.command_results, changed=True)