使用pdb调试devstack方法总结

devtsack环境准备：

• 下载devtstack代码：

git clone https://github.com/EldonZhao/devstack.git

• 编辑local.conf：

cd devstack
cp samples/local.conf .
vim local.conf
ADMIN_PASSWORD=123456
DATABASE_PASSWORD=123456
RABBIT_PASSWORD=123456
SERVICE_PASSWORD=$ADMIN_PASSWORD
HOST_IP=192.168.193.128

• 安装devstack：

FORCE=yes ./stack.sh

• 在需要断点代码前添加如下代码：

vim /opt/stack/senlin/senlin/api/openstack/v1/nodes.py
import pdb
pdb.set_trace()

• 重启代码所在进程：

source stack-screenrc
输入Ctrl+a
输入"（双引号）进入进程选择界面
选择代码所在进程，输入回车键enter（如下图）
输入Ctrl+c（结束进程）
输入方向键向上，输入回车键enter

devstack进程列表

重启的过程

• 触发断点：

[stack@eldon devstack]$ senlin --debug cluster-list -g
INFO (shell) 1
DEBUG (extension) found extension EntryPoint.parse('v2token = keystoneauth1.loading._plugins.identity.v2:Token')
DEBUG (extension) found extension EntryPoint.parse('admin_token = keystoneauth1.loading._plugins.admin_token:AdminToken')
DEBUG (extension) found extension EntryPoint.parse('v3oidcauthcode = keystoneauth1.loading._plugins.identity.v3:OpenIDConnectAuthorizationCode')
DEBUG (extension) found extension EntryPoint.parse('v2password = keystoneauth1.loading._plugins.identity.v2:Password')
DEBUG (extension) found extension EntryPoint.parse('v3password = keystoneauth1.loading._plugins.identity.v3:Password')
DEBUG (extension) found extension EntryPoint.parse('v3oidcpassword = keystoneauth1.loading._plugins.identity.v3:OpenIDConnectPassword')
DEBUG (extension) found extension EntryPoint.parse('token = keystoneauth1.loading._plugins.identity.generic:Token')
DEBUG (extension) found extension EntryPoint.parse('v3token = keystoneauth1.loading._plugins.identity.v3:Token')
DEBUG (extension) found extension EntryPoint.parse('password = keystoneauth1.loading._plugins.identity.generic:Password')
DEBUG (session) REQ: curl -g -i -X GET http://10.134.29.148:5000/v2.0 -H "Accept: application/json" -H "User-Agent: python-senlinclient"
INFO (connectionpool) Starting new HTTP connection (1): 10.134.29.148
DEBUG (connectionpool) "GET /v2.0 HTTP/1.1" 200 339
DEBUG (session) RESP: [200] Content-Length: 339 Vary: X-Auth-Token Keep-Alive: timeout=5, max=100 Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.1e-fips mod_wsgi/3.4 Python/2.7.5 Connection: Keep-Alive Date: Thu, 25 Feb 2016 12:14:54 GMT Content-Type: application/json x-openstack-request-id: req-52f92c50-a091-46a1-8a45-07f26a5e8c8f
RESP BODY: {"version": {"status": "stable", "updated": "2014-04-17T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.identity-v2.0+json"}], "id": "v2.0", "links": [{"href": "http://10.134.29.148:5000/v2.0/", "rel": "self"}, {"href": "http://docs.openstack.org/", "type": "text/html", "rel": "describedby"}]}}
DEBUG (v2) Making authentication request to http://10.134.29.148:5000/v2.0/tokens
DEBUG (connectionpool) "POST /v2.0/tokens HTTP/1.1" 200 4369
DEBUG (session) REQ: curl -g -i -X GET http://10.134.29.148:8778/v1/clusters -H "User-Agent: python-senlinclient" -H "Accept: application/json" -H "X-Auth-Token: {SHA1}dc50206f41d9861fe70c8c3fb7e2cb3d909a3389"
INFO (connectionpool) Starting new HTTP connection (1): 10.134.29.148

• 进行pdb调试：

b（or break）：设置断点；设置函数：b demo.func；设置行数：b demo:14(行数)
n（or next）：执行下一行：Step over，跳过
c（or continue）：执行下一个断点，没有断点则到程序结束：Step filter
s（or step）：进入函数，Step into，单步跳入
r（or return）：跳出函数，Step return
l（or list）：查看当前代码段
q（or quit）：退出当前debug
p（or print）：打印变量值
h（or help）：查看帮助
cl（clear）：清除所有节点
disable [bpnumber[bpnumber]]：将第num个断点失效，enable，失效第10个断点
enable [bpnumber[bpnumber]]：启用第num个断点，enable 10，启用第10个断点
w（where）：打印堆栈信息
a（args）：打印当前函数参数信息