用pdb调试OpenStack

ADMIN_PASSWORD=passwordMYSQL_PASSWORD=stackdbRABBIT_PASSWORD=stackqueueSERVICE_PASSWORD=$ADMIN_PASSWORD#enable_service rallySERVICE_TOKEN=password## vnc#enable_service n-spice#enable_service n-novnc#enable_service n-xvnc#GIT_BASE=https://code.csdn.net# Reclone each time#RECLONE=yesRECLONE=no## For KeystoneKEYSTONE_TOKEN_FORMAT=PKI## For Swift#SWIFT_REPLICAS=1#SWIFT_HASH=011688b44136573e209e# Enable LoggingLOGFILE=/opt/stack/logs/stack.sh.logVERBOSE=TrueLOG_COLOR=TrueSCREEN_LOGDIR=/opt/stack/logs# Pre-requisiteENABLED_SERVICES=rabbit,mysql,key## If you want ZeroMQ instead of RabbitMQ (don't forget to un-declare 'rabbit' from the pre-requesite)#ENABLED_SERVICES+=,-rabbit,-qpid,zeromq## If you want Qpid instead of RabbitMQ (don't forget to un-declare 'rabbit' from the pre-requesite)#ENABLED_SERVICES+=,-rabbit,-zeromq,qpid# Horizon (Dashboard UI) - (always use the trunk)ENABLED_SERVICES+=,horizonHORIZON_REPO=https://github.com/openstack/horizonHORIZON_BRANCH=master# Nova - Compute ServiceENABLED_SERVICES+=,n-api,n-crt,n-obj,n-cpu,n-cond,n-sch######vncENABLED_SERVICES+=,n-novnc,n-xvnc#jjIMAGE_URLS+=",https://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-x86_64-disk.img"#IMAGE_URLS+=",http://172.28.0.1/image/cirros-0.3.0-x86_64-disk.img"# Nova Network - If you don't want to use Neutron and need a simple network setup (old good stuff!)#ENABLED_SERVICES+=,n-net## Nova Cells#ENABLED_SERVICES+=,n-cell# Glance - Image ServiceENABLED_SERVICES+=,g-api,g-reg# Swift - Object Storage#ENABLED_SERVICES+=,s-proxy,s-object,s-container,s-account# Neutron - Networking Service# If Neutron is not declared the old good nova-network will be usedENABLED_SERVICES+=,q-svc,q-agt,q-dhcp,q-l3,q-meta,neutron## Neutron - Load BalancingENABLED_SERVICES+=,q-lbaas## Neutron - VPN as a ServiceENABLED_SERVICES+=,q-vpn## Neutron - Firewall as a ServiceENABLED_SERVICES+=,q-fwaas# VLAN configuration#Q_PLUGIN=ml2#ENABLE_TENANT_VLANS=True# GRE tunnel configurationQ_PLUGIN=ml2ENABLE_TENANT_TUNNELS=True# VXLAN tunnel configuration#Q_PLUGIN=ml2#Q_ML2_TENANT_NETWORK_TYPE=vxlan   # Cinder - Block Device ServiceVOLUME_GROUP="cinder-volumes"ENABLED_SERVICES+=,cinder,c-api,c-vol,c-sch,c-bak# Heat - Orchestration ServiceENABLED_SERVICES+=,heat,h-api,h-api-cfn,h-api-cw,h-eng#IMAGE_URLS+=",http://fedorapeople.org/groups/heat/prebuilt-jeos-images/F17-x86_64-cfntools.qcow2"# Ceilometer - Metering Service (metering + alarming)#ENABLED_SERVICES+=,ceilometer-acompute,ceilometer-acentral,ceilometer-collector,ceilometer-api#ENABLED_SERVICES+=,ceilometer-alarm-notify,ceilometer-alarm-eval# Apache fronted for WSGI#APACHE_ENABLED_SERVICES+=keystone,swiftAPACHE_ENABLED_SERVICES+=keystone

以上为localrc文件，用于devstack安装时的配置文件，用git clone一份devstack的源码，将localrc文件copy过去，然后./stack，就可以了。

1.  创建文件creds：

exportSERVICE_TOKEN=xxx(3中输入的密码)

exportOS_TENANT_NAME=admin

exportOS_USERNAME=admin

export OS_PASSWORD=xxx

exportOS_AUTH_URL=http://localhost:5000/v2.0/

exportSERVICE_ENDPOINT=http://localhost:35357/v2.0

source creds就可以使用openstack了

2. 若想更改已安装的组件，再./stack.sh即可

Pdb调试Havana过程

1.      修改代码

在需要调试的地方加入：

import pdb; pdb.set_trace()(以在nova/compute/api.py:get_all()中加入pdb为例)

2.      重启服务

在相应的screen中用ctrl+c终止当前进程，然后按向上的方向键，就会出现启动服务的命令，按enter服务就起来了。

3.      开始调试：

显示有两个screen

screen –x stack

进入如下界面：

最下一行表示，每一个进程都有一个screen。带*号的表示当前的screen，可以同时按下ctrl+a+8和ctrl+a+2分别前进和后退，来切换不同的screen.

4.      在0$中输入nova list；切换到4$ n-api:

5.      开始使用pdb进行调试

6. 物理机重启后，可使用rejoin-stack.sh启动openstack服务

7. ctrl+a+shift+", 可以选择screen , 主要就不需要通过ctrl + a  or ctrl + p 来回切换了：）。

参考资料

1.使用pdb调试openstack (How to debug openstackusing pdb )

http://blog.csdn.net/hackerain/article/details/8373597

2. linux screen 命令详解

http://www.cnblogs.com/mchina/archive/2013/01/30/2880680.html