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ubuntu 12.04配置rsync服务

rsync，remote synchronize顾名思意就知道它是一款实现远程同步功能的软件，它在同步文件的同时，可以保持原来文件的权限、时间、软硬链接等附加信息。

默认情况ubuntu安装了rsync服务，但在/etc下没有配置文件，一般情况可以copy示例文件到/etc下

安装sync，xinetd

$ sudo apt-get install rsync xinetd

1	$ sudo apt-get install rsync xinetd

$ sudo cp /usr/share/doc/rsync/examples/rsyncd.conf /etc

1	$ sudo cp /usr/share/doc/rsync/examples/rsyncd.conf /etc

查看内容，可以看到如下内容

# sample rsyncd.conf configuration file

# GLOBAL OPTIONS

#motd file=/etc/motd
#log file=/var/log/rsyncd
# for pid file, do not use /var/run/rsync.pid if
# you are going to run rsync out of the init.d script.
# pid file=/var/run/rsyncd.pid
#syslog facility=daemon
#socket options=

# MODULE OPTIONS

[ftp]

 comment = public archive
 path = /var/www/pub
 use chroot = yes
# max connections=10
 lock file = /var/lock/rsyncd
# the default for read only is yes...
 read only = yes
 list = yes
 uid = nobody
 gid = nogroup
# exclude =
# exclude from =
# include =
# include from =
# auth users =
# secrets file = /etc/rsyncd.secrets
 strict modes = yes
# hosts allow =
# hosts deny =
 ignore errors = no
 ignore nonreadable = yes
 transfer logging = no
# log format = %t: host %h (%a) %o %f (%l bytes). Total %b bytes.
 timeout = 600
 refuse options = checksum dry-run
 dont compress = *.gz *.tgz *.zip *.z *.rpm *.deb *.iso *.bz2 *.tbz

# sample rsyncd.conf configuration file

# GLOBAL OPTIONS

#motd file=/etc/motd

#log file=/var/log/rsyncd

# for pid file, do not use /var/run/rsync.pid if

# you are going to run rsync out of the init.d script.

# pid file=/var/run/rsyncd.pid

#syslog facility=daemon

#socket options=

# MODULE OPTIONS

[ftp]

comment = public archive

path = /var/www/pub

use chroot = yes

# max connections=10

lock file = /var/lock/rsyncd

# the default for read only is yes...

read only = yes

list = yes

uid = nobody

gid = nogroup

# exclude =

# exclude from =

# include =

# include from =

# auth users =

# secrets file = /etc/rsyncd.secrets

strict modes = yes

# hosts allow =

# hosts deny =

ignore errors = no

ignore nonreadable = yes

transfer logging = no

# log format = %t: host %h (%a) %o %f (%l bytes). Total %b bytes.

timeout = 600

refuse options = checksum dry-run

dont compress = *.gz *.tgz *.zip *.z *.rpm *.deb *.iso *.bz2 *.tbz

修改同步的目录，用户名，密码，日志信息

$ sudo vim /etc/rsyncd.conf

1	$ sudo vim /etc/rsyncd.conf

1.修改

path = /var/www/pub

1	path = /var/www/pub

为需要同步的目录。
如果路径中存在空格，则要分两种情况处理，如果空格在路径中间，如"/nfs/Public/Shared Videos",则直接写

path = /nfs/Public/Shared Videos

1	path = /nfs/Public/Shared Videos

如果空格在路径的最后面，如"/nfs/Public/Shared Videos "，则需要如下形式设置,注意最后面的"\ ",是一个反斜杠加空格，否则最后的空格会被忽略。

path = /nfs/Public/Shared Videos\

1	path = /nfs/Public/Shared Videos\

2.设置可以登录的用户名，密码，修改

# auth users =
# secrets file = /etc/rsyncd.secrets

1 2	# auth users = # secrets file = /etc/rsyncd.secrets

为

auth users = user
secrets file = /etc/rsyncd.secrets

1 2	auth users = user secrets file = /etc/rsyncd.secrets

配置用户名和密码

$ sudo vim /etc/rsyncd.secrets 

  user:password

$ sudo vim /etc/rsyncd.secrets

user:password

赋予权限 rsyncd.secrets的权限必须为600

$ sudo chmod 600 /etc/rsyncd.secrets

1	$ sudo chmod 600 /etc/rsyncd.secrets

3.开启日志

#log file=/var/log/rsyncd

1	#log file=/var/log/rsyncd

为

log file=/var/log/rsyncd

1	log file=/var/log/rsyncd

4.如果提示

rsync: change_dir "/" (in ftp) failed: Permission denied (13)

1	rsync: change_dir "/" (in ftp) failed: Permission denied (13)

则调整

uid = nobody
gid = nogroup

1 2	uid = nobody gid = nogroup

为

uid = root
gid = root

1 2	uid = root gid = root

5.对于严格要求一致性的重要的文件,去掉"refuse options"中的"checksum",这样会导致同步变慢，但是会比较安全（已经有报告说当同步时候不校验MD5会出现文件大小一致但是MD5不正确的情况），这个需要客户端在同步的时候使用 "-c" 作为参数。

 refuse options = dry-run

1	refuse options = dry-run

编辑/etc/default/rsync 启动rsync作为使用xinetd的守护进程

$ sudo vim /etc/default/rsync

1	$ sudo vim /etc/default/rsync

修改

RSYNC_ENABLE=inetd

1	RSYNC_ENABLE=inetd

创建 /etc/xinetd.d/rsync 通过xinetd使rsync开始工作

$ sudo vim /etc/xinetd.d/rsync

  service rsync
    {
        disable         = no
        socket_type     = stream
        wait            = no
        user            = root
        server          = /usr/bin/rsync
        server_args     = --daemon
        log_on_failure  += USERID
    }

$ sudo vim /etc/xinetd.d/rsync

service rsync

{

disable = no

socket_type = stream

wait = no

user = root

server = /usr/bin/rsync

server_args = --daemon

log_on_failure += USERID

}

启动/重启 xinetd

$ sudo /etc/init.d/xinetd restart

1	$ sudo /etc/init.d/xinetd restart

测试

运行下面的命令检查，确认rsync配置成功。

$ sudo rsync user@www.mobibrw.com::ftp
  Password: 
  drwxr-xr-x        4096 2006/12/13 09:41:59 .
  drwxr-xr-x        4096 2006/11/23 18:00:03 folders

$ sudo rsync user@www.mobibrw.com::ftp

Password:

drwxr-xr-x 4096 2006/12/13 09:41:59 .

drwxr-xr-x 4096 2006/11/23 18:00:03 folders

从服务器同步文件

$ sudo rsync -cvazu --progress user@www.mobibrw.com::ftp /rsync
Password:
receiving incremental file list
./
...................................

$ sudo rsync -cvazu --progress user@www.mobibrw.com::ftp /rsync

Password:

receiving incremental file list

...................................

c同步完成后校验文件MD5（慢，但是可靠）
v详细提示
a以archive模式操作，复制目录、符号连接
z压缩
u只进行更新，防止本地新文件被重写，注意两者机器的时钟的同步
--progress指显示进度

注意，如果需要为多个目录做独立的配置，可以参考如下配置（配置中设置了两个独立的同步目录"ftp"跟"movie"）

# sample rsyncd.conf configuration file

# GLOBAL OPTIONS

#motd file=/etc/motd
log file=/var/log/rsyncd
# for pid file, do not use /var/run/rsync.pid if
# you are going to run rsync out of the init.d script.
# pid file=/var/run/rsyncd.pid
#syslog facility=daemon
#socket options=

# MODULE OPTIONS

[ftp]
 comment = public archive
 path=/nfs/MyCloud
 use chroot = yes
# max connections=10
 lock file = /var/lock/rsyncd
# the default for read only is yes...
 read only = yes
 list = yes
 uid = root
 gid = root
# exclude =
# exclude from =# hosts allow =
# hosts deny =
# include =
# include from =
 auth users = user
 secrets file = /etc/rsyncd.secrets
 strict modes = yes
# hosts allow =
# hosts deny =
 ignore errors = no
 ignore nonreadable = yes
 transfer logging = no
# log format = %t: host %h (%a) %o %f (%l bytes). Total %b bytes.
 timeout = 600
 refuse options = dry-run
 dont compress = *.gz *.tgz *.zip *.z *.rpm *.deb *.iso *.bz2 *.tbz

[movie]
 comment = public archive
 path= /nfs/Public/Shared Videos
 use chroot = yes
# max connections=10
 lock file = /var/lock/rsyncd
# the default for read only is yes...
 read only = yes
 list = yes
 uid = root
 gid = root
# exclude =
# exclude from =
# include =
# include from =
 auth users = user
 secrets file = /etc/rsyncd.secrets
 strict modes = yes
# hosts allow =
# hosts deny =
 ignore errors = no
 ignore nonreadable = yes
 transfer logging = no
# log format = %t: host %h (%a) %o %f (%l bytes). Total %b bytes.
 timeout = 600
 refuse options = dry-run
 dont compress = *.gz *.tgz *.zip *.z *.rpm *.deb *.iso *.bz2 *.tbz

# sample rsyncd.conf configuration file

# GLOBAL OPTIONS

#motd file=/etc/motd

log file=/var/log/rsyncd

# for pid file, do not use /var/run/rsync.pid if

# you are going to run rsync out of the init.d script.

# pid file=/var/run/rsyncd.pid

#syslog facility=daemon

#socket options=

# MODULE OPTIONS

[ftp]

comment = public archive

path=/nfs/MyCloud

use chroot = yes

# max connections=10

lock file = /var/lock/rsyncd

# the default for read only is yes...

read only = yes

list = yes

uid = root

gid = root

# exclude =

# exclude from =# hosts allow =

# hosts deny =

# include =

# include from =

auth users = user

secrets file = /etc/rsyncd.secrets

strict modes = yes

# hosts allow =

# hosts deny =

ignore errors = no

ignore nonreadable = yes

transfer logging = no

# log format = %t: host %h (%a) %o %f (%l bytes). Total %b bytes.

timeout = 600

refuse options = dry-run

dont compress = *.gz *.tgz *.zip *.z *.rpm *.deb *.iso *.bz2 *.tbz

[movie]

comment = public archive

path= /nfs/Public/Shared Videos

use chroot = yes

# max connections=10

lock file = /var/lock/rsyncd

# the default for read only is yes...

read only = yes

list = yes

uid = root

gid = root

# exclude =

# exclude from =

# include =

# include from =

auth users = user

secrets file = /etc/rsyncd.secrets

strict modes = yes

# hosts allow =

# hosts deny =

ignore errors = no

ignore nonreadable = yes

transfer logging = no

# log format = %t: host %h (%a) %o %f (%l bytes). Total %b bytes.

timeout = 600

refuse options = dry-run

dont compress = *.gz *.tgz *.zip *.z *.rpm *.deb *.iso *.bz2 *.tbz

通过计划任务定时同步

1.创建脚本文件,假定文件在/home目录

$ vim rsync_backup.sh

#!/bin/sh 
rsync -auvz --password-file=/home/rsyncd.secrets user@www.mobibrw.com::ftp /rsync

$ vim rsync_backup.sh

#!/bin/sh

rsync -auvz --password-file=/home/rsyncd.secrets user@www.mobibrw.com::ftp /rsync

2.赋予执行权限

$ chmod +x rsync_backup.sh

1	$ chmod +x rsync_backup.sh

3.创建密码文件，自动填写密码

$ vim /home/rsyncd.secrects

password

$ vim /home/rsyncd.secrects

password

4.创建定时任务，每半小时自动检查备份一次

编辑计划任务文件,执行日志输出到 “/var/log/cron_rsync_backup.log”

$ vim cron_rsync_backup

*/30 * * * *  /home/rsync_backup.sh > /var/log/cron_rsync_backup.log 2>&1

$ vim cron_rsync_backup

*/30 * * * * /home/rsync_backup.sh > /var/log/cron_rsync_backup.log 2>&1

增加计划任务

$ crontab /home/cron_rsync_backup

1	$ crontab /home/cron_rsync_backup

重启计划任务，使之生效

$ /etc/init.d/cron restart

1	$ /etc/init.d/cron restart

检查是否已经成功增加计划

$ crontab -l

1	$ crontab -l

Android Studio如何Import Module 即项目依赖（针对非Gradle项目，以Crosswalk为例）

我们要写一个使用CrosswalkWebView的项目，就要依赖Crosswalk的工程，在Eclipse中存在Workspace的概念，对应到Android Studio 就变成了Module.

我们下载到的Crosswalk-WebView的工程是Eclipse建立的项目，此时项目是不能被Android Studio直接引用的，因此需要导入成Android Studio项目的一个Module。

导入Module

1.选择"Import Module"菜单

2.选择项目的路径，并且重命名 Module Name

3.完成导入

4.查看导入完成后的项目中，出现了新导入的 "CrosswalkWebview"，实质上是拷贝了所需要的文件到工程的目录中

设置Module之间项目依赖

1.选择"Open Module Settings"

2.设置模块依赖

3.选择依赖的Module

4.选中依赖的模块，点击“OK”

Ubuntu 14 安装 Atlassian Jira

JIRA是Atlassian公司出品的项目与事务跟踪工具，被广泛应用于缺陷跟踪、客户服务、需求收集、流程审批、任务跟踪、项目跟踪和敏捷管理等工作领域。

前些年CSDN搞了个99元买正版的活动，当时花钱买了个授权，然后束之高阁，这几天被翻出来了，捣鼓一下。

本文以 atlassian-jira-6.1.3-x64.bin 为例子。

下载独立安装包

下载地址 https://www.atlassian.com/software/jira/download

下载到用户当前目录 atlassian-jira-6.1.3-x64.bin

安装Java

$sudo apt-get install openjdk-7-jre

1	$sudo apt-get install openjdk-7-jre

给予安装包执行权限

$sudo chmod +x atlassian-jira-6.1.3-x64.bin

1	$sudo chmod +x atlassian-jira-6.1.3-x64.bin

以下是详细的执行安装过程

$ sudo ./atlassian-jira-6.1.3-x64.bin 
Unpacking JRE ...
Starting Installer ...

This will install JIRA 6.1.3 on your computer.
OK [o, Enter], Cancel [c]
o
Choose the appropriate installation or upgrade option.
Please choose one of the following:
Express Install (use default settings) [1], Custom Install (recommended for advanced users) [2, Enter], Upgrade an existing JIRA installation [3]
2

Where should JIRA 6.1.3 be installed?
[~/atlassian-jira-6.1.3-x64.bin.8800.dir]
/usr/share/atlassian/jira
Default location for JIRA data
[/var/atlassian/application-data/jira]

Configure which ports JIRA will use.
JIRA requires two TCP ports that are not being used by any other
applications on this machine. The HTTP port is where you will access JIRA
through your browser. The Control port is used to Startup and Shutdown JIRA.
Use default ports (HTTP: 8080, Control: 8005) - Recommended [1, Enter], Set custom value for HTTP and Control ports [2]
2
HTTP Port Number
[8080]
8888
Control Port Number
[8005]
8885
JIRA can be run in the background.
You may choose to run JIRA as a service, which means it will start
automatically whenever the computer restarts.
Install JIRA as Service?
Yes [y, Enter], No [n]
y

Extracting files ...
                                                         
Please wait a few moments while JIRA starts up.
Launching JIRA ...
Installation of JIRA 6.1.3 is complete
Your installation of JIRA 6.1.3 is now ready and can be accessed via your
browser.
JIRA 6.1.3 can be accessed at http://localhost:8888
Finishing installation ...

$ sudo ./atlassian-jira-6.1.3-x64.bin

Unpacking JRE ...

Starting Installer ...

This will install JIRA 6.1.3 on your computer.

OK [o, Enter], Cancel [c]

Choose the appropriate installation or upgrade option.

Please choose one of the following:

Express Install (use default settings) [1], Custom Install (recommended for advanced users) [2, Enter], Upgrade an existing JIRA installation [3]

Where should JIRA 6.1.3 be installed?

[~/atlassian-jira-6.1.3-x64.bin.8800.dir]

/usr/share/atlassian/jira

Default location for JIRA data

[/var/atlassian/application-data/jira]

Configure which ports JIRA will use.

JIRA requires two TCP ports that are not being used by any other

applications on this machine. The HTTP port is where you will access JIRA

through your browser. The Control port is used to Startup and Shutdown JIRA.

Use default ports (HTTP: 8080, Control: 8005) - Recommended [1, Enter], Set custom value for HTTP and Control ports [2]

HTTP Port Number

[8080]

8888

Control Port Number

[8005]

8885

JIRA can be run in the background.

You may choose to run JIRA as a service, which means it will start

automatically whenever the computer restarts.

Install JIRA as Service?

Yes [y, Enter], No [n]

Extracting files ...

Please wait a few moments while JIRA starts up.

Launching JIRA ...

Installation of JIRA 6.1.3 is complete

Your installation of JIRA 6.1.3 is now ready and can be accessed via your

browser.

JIRA 6.1.3 can be accessed at http://localhost:8888

Finishing installation ...

安装完成后，访问 http://localhost:8888 就可以了。

主要是要注意，安装的第二步，选择目录的时候，一定要更改默认的目录，否则安装到最后会报告异常。

Ubuntu 14.04/14.10/16.04编译CPU版本Caffe

最近在学习Deep Learning,参考一下经典的Caffe,记录一下编译历程。

安装build-essentials

安装开发所需要的一些基本包

$ sudo apt-get install build-essential

1	$ sudo apt-get install build-essential

安装OpenCV

图片处理都算依赖OpenCV,版本号要>=2.4版本，目前14.04跟14.10默认的版本都是2.4

$ sudo apt-get install libopencv-dev

1	$ sudo apt-get install libopencv-dev

安装数学计算库ATLAS

ATLAS提供离散数学，线性代数的计算支持

$ sudo apt-get install libatlas-base-dev

1	$ sudo apt-get install libatlas-base-dev

安装Boost库

Boost提供了一系列的C++算法支持，需要>=1.55版本,目前的14.04跟14.10默认的版本都是1.55

$ sudo apt-get install libboost-all-dev

1	$ sudo apt-get install libboost-all-dev

然后就是一些依赖项

protobuf,leveldb,snappy,hdf5,gflags-devel,glog-devel,lmdb-devel

$ sudo apt-get install libprotobuf-dev protobuf-compiler libleveldb-dev libsnappy-dev libhdf5-serial-dev libgoogle-glog-dev libgflags-dev liblmdb-dev

1	$ sudo apt-get install libprotobuf-dev protobuf-compiler libleveldb-dev libsnappy-dev libhdf5-serial-dev libgoogle-glog-dev libgflags-dev liblmdb-dev

安装GIT

$ sudo apt-get install git

1	$ sudo apt-get install git

下载代码

$ git clone https://github.com/BVLC/caffe.git

1	$ git clone https://github.com/BVLC/caffe.git

编译Caffe

$ cd caffe

$ cp Makefile.config.example Makefile.config

$ cd caffe

$ cp Makefile.config.example Makefile.config

然后修改里面的内容，主要需要修改的参数包括
CPU_ONLY是否只使用CPU模式，没有GPU没安装CUDA的同学可以打开这个选项
BLAS (使用intel mkl还是OpenBLAS)
完成设置后,开始编译

$ make all -j4

$ make test

$ make runtest

$ make all -j4

$ make test

$ make runtest

编译出错的处理

Ubuntu 16.04下编译时候提示:

CXX src/caffe/solvers/sgd_solver.cpp
In file included from src/caffe/solvers/sgd_solver.cpp:5:0:
./include/caffe/util/hdf5.hpp:6:18: fatal error: hdf5.h: No such file or directory
#include "hdf5.h"

CXX src/caffe/solvers/sgd_solver.cpp

In file included from src/caffe/solvers/sgd_solver.cpp:5:0:

./include/caffe/util/hdf5.hpp:6:18: fatal error: hdf5.h: No such file or directory

#include "hdf5.h"

解决方法:
1. 编辑Makefile.config,在文件最后，添加/usr/include/hdf5/serial到INCLUDE_DIRS

INCLUDE_DIRS += /usr/include/hdf5/serial

1	INCLUDE_DIRS += /usr/include/hdf5/serial

2.修改Makefile文件，把hdf5_hl和hdf5修改为hdf5_serial_hl和hdf5_serial，也就是把下面第一行代码改为第二行代码。

原始内容：

LIBRARIES += glog gflags protobuf boost_system boost_filesystem m hdf5_hl hdf5

1	LIBRARIES += glog gflags protobuf boost_system boost_filesystem m hdf5_hl hdf5

修改后的内容：

LIBRARIES += glog gflags protobuf boost_system boost_filesystem m hdf5_serial_hl hdf5_serial

1	LIBRARIES += glog gflags protobuf boost_system boost_filesystem m hdf5_serial_hl hdf5_serial

编译Python接口

$ sudo apt install python-pip

$ pip install --upgrade pip

$ sudo pip install -r python/requirements.txt

$ sudo apt-get install python-numpy

$ make pycaffe

$ make distribute

$ sudo apt install python-pip

$ pip install --upgrade pip

$ sudo pip install -r python/requirements.txt

$ sudo apt-get install python-numpy

$ make pycaffe

$ make distribute

Sigmoid函数

Sigmoid函数是一个S型函数. Sigmoid函数的数学公式为

它是常微分方程

的一个解.

Sigmoid函数具有如下基本性质：

定义域为
值域为, 为有界函数
函数在定义域内为连续和光滑函数
函数的导数为
不定积分为, 为常数

由于Sigmoid函数所具有的性质, 它常和单位阶跃函数用于构造人工神经网络^[1]; 另外心理学中的学习曲线^[2]的形状也和Sigmoid函数比较类似.

参考资料

[1]

Ito, Y. (1991). "Representation of functions by superpositions of a step or sigmoid function and their applications to neural network theory." Neural Networks 4(3): 385-394.

[2]

Yelle, L. E. (1979). "The learning curve: Historical review and comprehensive survey." Decision Sciences 10(2): 302-328.

国内Android SDK 镜像

最近更新Android SDK的时候奇慢无比，频繁失败，到了无法使用的地步，搜索了一下找到一个比较好用的国内镜像。
北京化工大学镜像站 http://ubuntu.buct.edu.cn/

Android镜像设置如下
1.点击选项

2.代理服务器填写ubuntu.buct.edu.cn或ubuntu.buct.cn或ubuntu.buct6.edu.cn(IPv6)，端口80，强制HTTP
注：该代理并非正向代理也不是反向代理，所有代理请求将被重定向至本站镜像。

3.关闭SDK Manager

4.单击Reload，选择需要的组件，即可安装

Android Studio中创建keystore

一直在Eclipse中开发Android，切换到Android Studio中之后，各种不习惯。基本的创建keystore文件的操作也是找了半天才找到。

1.点击Build ,在下拉框中选择 "Generate Signed APK"

2.选择 "Create new"

3.按照里面的内容填写即可，注意最后文件的扩展名变为".jks",而不是以前的".keystore".

注意：最新的Android Studio 4.x版本已经没办法按照上面的办法创建证书了，创建证书会报告如下错误：

解决方法是在Android Studio的命令行中执行证书创建命令，创建pkcs12格式的证书，如下：

$ keytool -deststoretype pkcs12 -genkeypair -alias ka -keystore ks.p12 -keyalg RSA

1	$ keytool -deststoretype pkcs12 -genkeypair -alias ka -keystore ks.p12 -keyalg RSA

参考下图：

根据提示，补充内容即可。

Android Studio中使用证书：

signingConfigs {
	release {
		File strFile = new File("ks.p12")
		storeFile file(strFile)
		keyAlias 'ka'
		keyPassword 'password'
		storePassword 'password'
	}
	debug {
		File strFile = new File("ks.p12")
		storeFile file(strFile)
		keyAlias 'ka'
		keyPassword 'password'
		storePassword 'password'
	}
}

buildTypes {
	release {
		signingConfig signingConfigs.release
		minifyEnabled false
		proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
	}
	debug {
		signingConfig signingConfigs.debug
	}
}

signingConfigs {

release {

File strFile = new File("ks.p12")

storeFile file(strFile)

keyAlias 'ka'

keyPassword 'password'

storePassword 'password'

}

debug {

File strFile = new File("ks.p12")

storeFile file(strFile)

keyAlias 'ka'

keyPassword 'password'

storePassword 'password'

}

buildTypes {

release {

signingConfig signingConfigs.release

minifyEnabled false

proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

}

debug {

signingConfig signingConfigs.debug

}

参考链接

使用keytool 生成证书

小米音箱连接到Intel Wireless Bluetooth 7260 音质非常差的解决

最近买了个小米音箱，如下图所示。连接到手机，连接到 DELL笔记本的蓝牙上面都是正常的，但是一旦连接到 Intel Wireless Bluetooth 7260 上面，立即就会音质非常差了。纠结了好久终于找到原因。

首先看看音质非常差的原因，按照下图操作

20150315131426

可以看到下图的显示，此时，音频处于单声道的8000采样，这个音频质量太差，没办法听音乐的，失真严重。而且没办法选择。

怎么处理呢？如下操作

然后

关闭语音服务，连接音乐服务。

点击后的结果如下所示即可

此时再次观察合成器的属性

20150315131426

观察高级属性

此时大家听音乐的时候，就会效果非常好了。

总结一下原因：

Intel的蓝牙，默认连接了小米的语音电话功能，这个功能按理说在蓝牙通信的时候，音箱应该声明自身没有电话通信功能的，可是小米的音箱错误的声明自己支持语音通话，造成了蓝牙协议栈把音箱当成了电话，导致默认音频异常。

升级到OS X Yosemite后 Android Studio启动崩溃 Symbol not found: _CGContextSetAllowsAcceleration

Mac OS 升到Yosemite后，打开 Android Studio报

Symbol not found: _CGContextSetAllowsAcceleration   
Referenced from: /Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Libraries/libawt.jnilib

1 2	Symbol not found: _CGContextSetAllowsAcceleration Referenced from: /Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Libraries/libawt.jnilib

解决方法，是重新安装Apple的Java支持：
Apple官网下载或者本站下载

Ubuntu 12.04 下 Apache 2.2.22 开启 Https

最近发现网站总是被电信恶意添加了广告，导致链接总是各种异常，因此打算开启HTTPS来规避这种情况。本来以为很简单的，结果发现网上的各种不靠谱。

1.启用Apache自带的SSL模块

sudo a2enmod ssl

1	sudo a2enmod ssl

2.激活Apache对于HTTPS的支持

sudo a2ensite default-ssl

1	sudo a2ensite default-ssl

这一步骤其实就是把/etc/apache2/sites-available/default-ssl拷贝到了 /etc/apache2/sites-enabled/default-ssl,并且更改了一下文件权限

如果要取消对于HTTPS的支持可以执行

sudo a2dissite default-ssl

1	sudo a2dissite default-ssl

或者

sudo rm -rf /etc/apache2/sites-enabled/default-ssl

1	sudo rm -rf /etc/apache2/sites-enabled/default-ssl

3.强制Apache2 刷新配置

sudo service apache2 reload

1	sudo service apache2 reload

或者

sudo service apache2 restart

1	sudo service apache2 restart

这样便开启了Apache2 的HTTPS支持，此时输入https://www.mobibrw.com/就可以正常访问了。

但是此时使用的证书是在 /etc/apache2/sites-enabled/default-ssl中配置的默认的证书文件，内容如下：

#   A self-signed (snakeoil) certificate can be created by installing
#   the ssl-cert package. See
#   /usr/share/doc/apache2.2-common/README.Debian.gz for more info.
#   If both key and certificate are stored in the same file, only the
#   SSLCertificateFile directive is needed.

SSLCertificateFile    /etc/ssl/certs/ssl-cert-snakeoil.pem
SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key

# A self-signed (snakeoil) certificate can be created by installing

# the ssl-cert package. See

# /usr/share/doc/apache2.2-common/README.Debian.gz for more info.

# If both key and certificate are stored in the same file, only the

# SSLCertificateFile directive is needed.

SSLCertificateFile /etc/ssl/certs/ssl-cert-snakeoil.pem

SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key

如果要替换成自己的证书文件，只要修改 SSLCertificateFile 跟SSLCertificateKeyFile就可以了。

上面使用的例子的证书格式是.pem格式的，如果是.csr格式的只要是Base64编码格式的（记事本打开之后，首行是"-----BEGIN CERTIFICATE-----"），跟上面的例子相同，直接设置就可以了。以申请到的沃通的免费证书为例子：

申请完成后的证书ZIP文件中有一个for Apache.zip的压缩包，解压缩之后，上传到服务器，然后直接如下设置就可以了：

#   A self-signed (snakeoil) certificate can be created by installing
#   the ssl-cert package. See
#   /usr/share/doc/apache2.2-common/README.Debian.gz for more info.
#   If both key and certificate are stored in the same file, only the
#   SSLCertificateFile directive is needed.

SSLCertificateFile    /etc/apache2/certs/wosign.csr
SSLCertificateKeyFile /etc/apache2/certs/wosign.key

# A self-signed (snakeoil) certificate can be created by installing

# the ssl-cert package. See

# /usr/share/doc/apache2.2-common/README.Debian.gz for more info.

# If both key and certificate are stored in the same file, only the

# SSLCertificateFile directive is needed.

SSLCertificateFile /etc/apache2/certs/wosign.csr

SSLCertificateKeyFile /etc/apache2/certs/wosign.key

至于其他的配置，跟/etc/apache2/sites-enabled/000-default中的一致就可以了。

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导入Module

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参考资料

参考链接