packstack总体流程分析2

packstack总体流程分析（2）本文回答这两个问题：这些create_xxx_manifest是由哪里来调用的？/var/tmp/packstack/xxx/xxx.pp是如何被执行的？ (1)各plugins中的create_xxx_mainfest是如何被调用的？def initPluginsSequences():

for plugin incontroller.getAllPlugins():

plugin.initSequences(controller)在initPluginsSequences中，会去调用所有plugins.xxx.py中的initSequences 其中plugin就是一个plugins.xxx.py文件，比如cinder_250.py，nova_300.py(2)某个plugin中的initSequences的一个例子：比如plugins/cinder_250.py中的initSequences：def initSequences(controller):

config = controller.CONF

if config['CONFIG_CINDER_INSTALL'] != 'y':

return

config['CONFIG_CINDER_BACKEND'] = (

[i.strip() for i in config['CONFIG_CINDER_BACKEND'].split(',') if i]

)

for key in ('CONFIG_CINDER_NETAPP_VOLUME_LIST',

'CONFIG_CINDER_GLUSTER_MOUNTS',

'CONFIG_CINDER_NFS_MOUNTS'):

if key in config:

config[key] = [i.strip() for i in config[key].split(',') if i]

cinder_steps = [

{'title': 'Adding Cinder Keystone manifest entries',

'functions': [create_keystone_manifest]}

]

if 'lvm' in config['CONFIG_CINDER_BACKEND']:

cinder_steps.append(

{'title': 'Checking if the Cinder server has a cinder-volumes vg',

'functions': [check_cinder_vg]})

cinder_steps.append(

{'title': 'Adding Cinder manifest entries',

'functions': [create_manifest]}

 

)

controller.addSequence("Installing OpenStack Cinder", [], [], cinder_steps)（3）functions的执行：生成/var/tmp/packstack/xxx/xxx.pp文件，即生成puppet文件def runSequences():controller.runAllSequences()如果function不是plugins.puppet_xxx.py中的，那么会调用create_xxx_manitest()生成host_ip_plugin.pp，比如192.168.129.130_cinder.pp如果function是plugins.puppet_xxx.py中的，那么会调用puppet apply来执行这些puppet，来做实际的部署工作。 （4）调用各plugins/xxx.py:create_xxx_manifest的流程生成puppet文件，以及这些puppet文件被最终执行的流程如下： installer.run_setup.py:main()->installer.run_setup.py:_main()->installer.run_setup.py:_main():initPluginsSequences()

->installer.run_setup.py: initPluginsSequences()

->plugins.cinder_xxx.py: initSequences()

->plugins.nova_xxx.py: initSequences()

->plugins.puppet_xxx.py：initSequences()->installer.run_setup.py:_main():runSequences()

->installer.setup_controller.py: runAllSequences()

->installer.core.sequences.py: Sequence.run()

->installer.core.sequences.py: Step.run()

->plugins.xxx.py:在initSequences中初始化的functions

->if not puppet_xxx.py:

->appendManifestFile:生成host_ip_cinder.pp,目录在/var/tmp/packstac/uuid/下

->if puppet_xxx.py:

-> plugins.puppet.initSequences()会将apply_puppet_manifest这一function加入到sequence中

-> plugins.puppet.apply_puppet_manifest()调用puppet apply，执行这些puppet脚本