主要是讲如何启动openstack nova-extend services，该服务用于Openstack 二次扩展及部分需求开发，例如 ，节点巡检，动态迁移（基于FUSE 文件系统实现，分布式系统，如MooseFS),文件注入，Nova 服务的自身修复，instances IO 控制，instances CPU 隔离技术实现等其他需求开发
第一章：如何create openstack nova-extend service
a) 创建python-extend 文件
cp -fr /usr/bin/python /usr/bin/python-extend
用于启动openstack nova-extend 服务，Python 服务启动nova-extend ，socket 模块不能正常果子，具体原因在于协程分装，无法使用socket，threading等模块属性
b)创建启动程序python-extend 文件，保留在/usr/bin/
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import sys
from nova.cmd.extend import main
if __name__ == "__main__":
sys.exit(main())
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c) 创建from nova.cmd.extend import main 程序，调用nova.services.py
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import sys
from oslo.config import cfg
from nova import config
from nova import objects
from nova.openstack.common import log as logging
from nova import service
from nova import utils
CONF = cfg.CONF
CONF.import_opt('topic', 'nova.extend.api', group='extend')
def main():
objects.register_all()
config.parse_args(sys.argv)
logging.setup("nova")
utils.monkey_patch()
server = service.Service.create(binary='nova-extend',
topic=CONF.extend.topic,
manager=CONF.extend.manager)
service.serve(server, workers=CONF.extend.workers)
service.wait()
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d) /etc/nova.conf 配置
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extend_manager=nova.extend.manager.ExtendManager
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e) 创建openstack-nova-extend 启动服务脚步
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#!/bin/sh
. /etc/rc.d/init.d/functions
suffix=extend
prog=openstack-nova-$suffix
exec="/usr/bin/nova-$suffix"
config="/etc/nova/nova.conf"
pidfile="/var/run/nova/nova-$suffix.pid"
logfile="/var/log/nova/$suffix.log"
[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog
lockfile=/var/lock/subsys/$prog
start() {
[ -x $exec ] || exit 5
[ -f $config ] || exit 6
echo -n $"Starting $prog: "
daemon --user nova --pidfile $pidfile "$exec --logfile $logfile &>/dev/null & echo \$! > $pidfile"
retval=$?
echo
[ $retval -eq 0 ] && touch $lockfile
return $retval
}
stop() {
echo -n $"Stopping $prog: "
killproc -p $pidfile $prog
retval=$?
echo
[ $retval -eq 0 ] && rm -f $lockfile
return $retval
}
restart() {
stop
start
}
reload() {
restart
}
force_reload() {
restart
}
rh_status() {
status -p $pidfile $prog
}
rh_status_q() {
rh_status >/dev/null 2>&1
}
case "$1" in
start)
rh_status_q && exit 0
$1
;;
stop)
rh_status_q || exit 0
$1
;;
restart)
$1
;;
reload)
rh_status_q || exit 7
$1
;;
force-reload)
force_reload
;;
status)
rh_status
;;
condrestart|try-restart)
rh_status_q || exit 0
restart
;;
*)
echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
exit 2
esac
exit $?
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f) 启动openstack-nova-extend服务
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[root@athController cmd]
[root@athController cmd]
2014-08-04 23:18:58.325 47419 INFO nova.openstack.common.service [-] Caught SIGTERM, exiting
2014-08-04 23:19:00.151 45666 INFO nova.openstack.common.periodic_task [-] Skipping periodic task _periodic_update_dns because its interval is negative
2014-08-04 23:19:00.183 45666 AUDIT nova.service [-] Starting extend node (version 2013.2.1-1.el6)
2014-08-04 23:19:00.513 45666 INFO nova.openstack.common.rpc.common [req-d6b00731-baaa-47fa-bfa2-75f9ec4ef568 None None] Connected to AMQP server on 192.168.8.180:5672
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g) openstack-nova-extend 消息队列信息
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[root@athController cmd]
extend 0
extend.athCloud.8.180.abs.com.cn 0
extend_fanout_6dbb351ab48445cfaadc9de37e87d68f 0
extend_fanout_e870b14296354eddba09389319a9c590 0
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h) nova-manager service list 查看nova-extend服务状态
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[root@athController cmd]
Binary Host Zone Status State Updated_At
nova-conductor athController.8.180.abs.com.cn internal enabled :-) 2014-08-04 15:22:20
nova-consoleauth athController.8.180.abs.com.cn internal enabled :-) 2014-08-04 15:22:19
nova-cert athController.8.180.abs.com.cn internal enabled :-) 2014-08-04 15:22:20
nova-scheduler athController.8.180.abs.com.cn internal enabled :-) 2014-08-04 15:22:18
nova-network athController.8.180.abs.com.cn internal enabled :-) 2014-08-04 15:22:11
nova-compute athController.8.180.abs.com.cn nova enabled :-) 2014-08-04 15:22:10
nova-console athController.8.180.abs.com.cn internal enabled :-) 2014-08-04 15:22:17
nova-extend athController.8.180.abs.com.cn internal enabled :-) 2014-08-04 15:22:10
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i) 总结
openstack开发其实并不是很难，只要了解nova-compute，nova-api启动过程，参照文档基本都能实现
到此openstack Nova extend 服务启动实现完毕，下一章节将会在下周一撰写openstack nova-extend nova.extend.manager 功能实现，谢谢大家，如有不明白的地方请留言，我会在中午时间一一帮助大家解答，欢迎点评
写的不好的地方还希望大牛们指点，共同学习
本文转自 swq499809608 51CTO博客，原文链接:http://blog.51cto.com/swq499809608/1535750
Openstack架构构建及详解(4)--Nova组件
