graphite+grafana 修改指标存放时间后重启失败

由于领导安排，今天遇到一个新需求，需要展示7天内cf app 高峰期cpu平均值，翻阅一看，grafana只保留了一天的数据，所以修改指标保留期限：

vi  /opt/graphite/conf/storage-schemas.conf
# Schema definitions for Whisper files. Entries are scanned in order,
# and first match wins. This file is scanned for changes every 60 seconds.
#
#  [name]
#  pattern = regex
#  retentions = timePerPoint:timeToStore, timePerPoint:timeToStore, ...

# Carbon's internal metrics. This entry should match what is specified in
# CARBON_METRIC_PREFIX and CARBON_METRIC_INTERVAL settings
[carbon]
pattern = ^carbon.
retentions = 60:90d

[default_1min_for_1day]
pattern = .*
retentions = 60s:15d

修改完毕，页面指标数据依然保持一天的量，当时想当然的以为需要重启graphite使配置生效。后来验证表明，调整这里的配置后，必须删除以前生成的wsp文件，生成新的wsp文件后方可生效。

结果如下操作后，grafana报错无法正常连接sqlite数据库。

$ cd /opt/graphite/
$ sudo ./bin/carbon-cache.py start
 
$ sudo /etc/init.d/apache2 restart
 
# cd /opt/graphite
# PYTHONPATH=`pwd`/storage/whisper ./bin/run-graphite-devel-server.py --port=8085 --libs=`pwd`/webapp /opt/graphite 1>/opt/graphite/storage/log/webapp/process.log 2>&1 &
# tail -f /opt/graphite/storage/log/webapp/process.log

访问http://ip:8085 ，graphite webapp报出如下类似的问题.

File "/opt/graphite/webapp/graphite/urls.py", line 15, in <module>
    from django.conf.urls.defaults import *ImportError: No module named defaults

原因在于：Django版本变化，由原来的1.5.12升级到Django 1.6 时改变了模块结构，原先的defaults模块被去除了。查看django版本：

Python 2.7.6 (default, Jun 22 2015, 17:58:13) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import django
>>> print django.VERSION
(1, 5, 12, 'final', 0)
>>>

为了解决这一问题你有两种方式。

1：回滚到1.5.12

2：找到代码问题行，将此行改为

from django.conf.urls import patterns, url, include

经过反复百度查阅资料，终于找到一个靠谱的解决方法：

python scirpte name: fixerrorNomodule.py
import re
files = ["/opt/graphite/webapp/graphite/urls.py",
"/opt/graphite/webapp/graphite/urls.py",
"/opt/graphite/webapp/graphite/render/urls.py",
"/opt/graphite/webapp/graphite/cli/urls.py",
"/opt/graphite/webapp/graphite/composer/urls.py",
"/opt/graphite/webapp/graphite/metrics/urls.py",
"/opt/graphite/webapp/graphite/browser/urls.py",
"/opt/graphite/webapp/graphite/account/urls.py",
"/opt/graphite/webapp/graphite/dashboard/urls.py",
"/opt/graphite/webapp/graphite/whitelist/urls.py",
"/opt/graphite/webapp/graphite/graphlot/urls.py",
"/opt/graphite/webapp/graphite/version/urls.py",
"/opt/graphite/webapp/graphite/events/urls.py"]
files2= ["/opt/graphite/webapp/graphite/urls.py"]
str = 'from django.conf.urls.defaults import *
'
for file in files: 
    print file
    f = open(file, "r+")
    flists = f.readlines()
    print len(flists),
    for i in range(len(flists)):
        if flists[i] == str:
            print flists[i]
            flists[i] = "from django.conf.urls import patterns, url, include 
"
        else:
            pass
    f = open(file, "w+")
    f.writelines(flists)
    f.close()

修复后，再次重启服务，grafana得以回复正常。为表示感谢，特标注原作者地址：http://zicowarn.blog.51cto.com/3815716/1542790/

再次提醒：调整配置后，必须删除以前生成的wsp文件，生成新的wsp文件后方可生效。