How to use WiringPi2 for Python on the Raspberry Pi in Raspbian part 1

http://raspi.tv/2013/how-to-use-wiringpi2-for-python-on-the-raspberry-pi-in-raspbian

 

http://wiringpi.com/wp-content/uploads/2013/03/pins.pdf

 

http://www.element14.com/community/docs/DOC-73950/l/raspberry-pi-2-model-b-gpio-40-pin-block-pinout

 

https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf

 

http://www.cnblogs.com/sn-dnv-aps/p/4390899.html

apt-get update 问题

环境：Ubuntu 14.04

使用apt-get update出现如下问题：

Fetched 11.8 MB in 26s (448 kB/s)
W: GPG error: http://security.debian.org wheezy/updates InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 9D6D8F6BC857C906 NO_PUBKEY 8B48AD6246925553
W: GPG error: http://http.debian.net wheezy-updates Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010
W: Failed to fetch http://packages.couchbase.com/ubuntu/dists/trusty/InRelease Unable to find expected entry ‘precise/main/binary-amd64/Packages’ in Release file (Wrong sources.list entry or malformed file)

W: Failed to fetch http://http.debian.net/debian/dists/wheezy/Release.gpg Connection failed

 

解决方法，增加公共的key:
sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 9D6D8F6BC857C906 8B48AD6246925553 7638D0442B90D010 6FB2A1C265FFB764

 

 

使用淘宝NPM镜像

环境: Ubuntu 14.04

在使用js库的时候老是有些包无法下载使用（又被墙了），最近发现淘宝开发一个NPM镜像。

地址如下：http://npm.taobao.org/

安装如下：

npm config set ca “”

sudo npm install -g cnpm –registry=https://registry.npm.taobao.org

 

安装包 leaflet-storage

sudo cnpm install napa

sudo cnpm install leaflet-storage
/usr/bin/env: node: No such file or directory

 

解决如下：sudo ln /usr/bin/nodejs /usr/bin/node

 

 

单机安装Ceph

环境: Ubuntu 14.04

一直想用做图片方面的存储，之前有用过Riak CS，但布署，安装和管理挺麻烦的。后来知道ceph，了解它的途径是使用它了。先说下安装步骤：

wget -q -O- ‘https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc’ | sudo apt-key add –

echo deb http://ceph.com/debian-giant/ trusty main | sudo tee /etc/apt/sources.list.d/ceph.list

更新系统
sudo apt-get -q update

安装ceph布署工具
sudo apt-get install ceph-deploy

查询主机名
hostname
主机名为ubuntu

初始化节点信息
sudo ceph-deploy new ubuntu

安装ceph软件
sudo ceph-deploy install ubuntu

创建mon集群
sudo ceph-deploy mon create

启动mon进程
sudo ceph-deploy mon create-initial

安装OSD
sudo mkdir -p /data/osd
sudo ceph-deploy osd prepare ubuntu:/data/osd
sudo ceph-deploy osd activate ubuntu:/data/osd

查看ceph状态
sudo ceph health

增加一个元数据服务器
sudo ceph-deploy mds create ubuntu

查看进程
jerry@ubuntu:~$ ps ax | grep ceph
8863 ? Ssl 0:00 /usr/bin/ceph-mon –cluster=ceph -i ubuntu -f
9357 ? Ssl 0:01 /usr/bin/ceph-osd –cluster=ceph -i 0 -f
9496 ? Ssl 0:00 /usr/bin/ceph-mds –cluster=ceph -i ubuntu -f
9517 pts/0 S+ 0:00 grep –color=auto ceph

有三个ceph服务

查看状态
sudo ceph -s

 

使用ceph

启动ceph-rest-api

sudo ceph-rest-api -n client.admin &

通过浏览器查看 http://192.168.56.101:5000/