hackerain

a = (a+50-int(a)%50);
 
 
For example:
 
before after
 
a=1 --> a=50
a=49 --> a=50
a=51 --> a=100

hackerain

C语言产生随机数需要调用stdlib.h头文件中的两个函数：
int rand(void)： 产生一个0到RAND_MAX之间的随机整数。（RAND_MAX定义在stdlib.h, 其值为2147483647）
void srand(int seed)： 用于初始化种子，便于每次产生不同的随机数。

/*
如果要产生其他范围内的整数，可以使用取余运算实现。以下代码为产生0～100之间的随机数：
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

hackerain

public void bindCloudletsToVmsSimple(){
    int vmNum = vmList.size();
    int cloudletNum = cloudletList.size();

    int idx = 0;

    for (int i=0;i<cloudletNum;i++){
        cloudletList.get(i).setVmId(vmList.get(idx).getId());
        idx = (idx+1)%vmNum;
    }

hackerain

suo@ustack:~/devstack$ curl -H "content-type: application/json" -H "x-auth-token:$ADMIN" http://localhost:35357/v3/credentials -d '{"credential": {"user_id": "91f2f916a5714101866ae325fd6d5aec", "project_id" : "473c507eb7e645fda4d7dabb6c7eac03", "blob": {"AccessKey": "AKIAJ5AAFSPWGWH25P3A", "SecertKey": "PzJGRqDLN8uET9ZzhQZ4wy5gTIGFxE1S3FhghwS8"}, "type": "AccessKey"}}' | ./jsontool.py 
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   611  100   372  100   239   6223   3998 --:--:-- --:--:-- --:--:--  6200
{
  "credential": {
    "user_id": "91f2f916a5714101866ae325fd6d5aec", 
    "links": {
      "self": "http://localhost:5000/v3/credentials/c04f153f34134fb68699c9efb70c50ec"
    }, 

hackerain

#set -g prefix C-x
#unbind C-b
#bind-key C-x send-prefix

set-option -g status-keys vi
set-window-option -g mode-keys vi
setw -g mode-mouse on

set -g mouse-resize-pane on
set -g mouse-select-pane on

hackerain

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sched
import sys,time

# action function, and add another event to queue.
def event(action_time):
    print "action_time:%s" % (action_time)
    scheduler.enterabs(action_time + 5, 1, event, (action_time + 5,))

hackerain

import wsme
from pecan import rest
from wsmeext.pecan import wsexpose
         
         
class RootController(rest.RestController):
         
    @wsexpose(wsme.types.File)
    def get(self):
         

hackerain

SCREEN_NAME=${SCREEN_NAME:-gring}
USE_SCREEN=${USE_SCREEN:-True}
CONFIG_FILE=${CONFIG_FILE:-/etc/gringotts/gringotts.conf}
 
function screen_it {
 
    echo "staring $1"
 
    if [[ "$USE_SCREEN" = "True" ]]; then
        screen -S $SCREEN_NAME -X screen -t $1

hackerain

SCREEN_NAME=${SCREEN_NAME:-gring}
 
SCREEN=$(which screen)
if [[ -n "$SCREEN" ]]; then
    SESSION=$(screen -ls | awk '/[0-9].'$SCREEN_NAME'/ { print $1 }')
    if [[ -n "$SESSION" ]]; then
        screen -X -S $SESSION quit
    fi  
fi

hackerain

通过availability_zone参数可以将虚拟机强制调度到指定的计算节点，但是默认的该参数只能由admin使用，若要普通用户使用，在nova的policy.json中，将"compute:create:forced_host": "is_admin:True"，这条规则改为"compute:create:forced_host": ""


命令行：

nova boot --image c796de54-25f8-405e-afdd-e03003a9e62a --nic net-id=ba05e057-1eb8-4cb2-af58-9b99a72df5ed --flavor 2 --availability_zone nova:server-76 vm


API: