njduck – NjDuck.com

如何编译系统签名的APK

在github上下载工具：

 https://github.com/getfatday/keytool-importkeypair

从安卓源代码中复制必要的文件：

文件路径：build/target/product/security
platform.pk8
platform.x509.pem

把上面这2个文件和工具放在同一个目录下，执行下面的命令：

sh keytool-importkeypair -k ./platform.keystore -p android -pk8 platform.pk8 -cert platform.x509.pem -alias platform

-p: 密码，上面的例子使用了android

-alias: 别名，签名的时候需要，上面的例子使用了platform

修改AndroidManifest.xml文件，添加下面的内容之一：

android:sharedUserId=”android.uid.system
android:sharedUserId=”android.uid.shared”
android:sharedUserId=”android.media”

<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.njduck.demoapp"
    android:sharedUserId="android.uid.system">

ubuntu编译AOSP

系统环境： ubuntu 20.04 LTS

安装必要工具：

sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z-dev ccache libgl1-mesa-dev libxml2-utils xsltproc unzip openjdk-8-jdk libtinfo-dev libncurses-dev libncurses5 libssl-dev

修改BaseTools路径：

cd bootable/bootloader/edk2
rm -rf Conf/BuildEnv.sh
unset EDK_TOOLS_PATH
./edksetup.sh BaseTools
cd -

开始编译吧：

source build/envsetup.sh
lunch xxx
make -j40

等等……

需要LLVM?

sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"

docker镜像的导出与导入

导出

docker save -o rocketmq.tar rocketmq

导入

docker load --input rocketmq.tar

如何新建自签名SSL证书

准备工作：

mkdir ca
cd ca
mkdir demoCA
mkdir demoCA/newcerts
touch demoCA/index.txt
echo "01" > demoCA/serial

2. 生成CA证书

openssl genrsa -des3 -out ca.key 2048

3. 生成CA公钥

openssl req -new -x509 -days 7305 -key ca.key -out ca.crt

4. 生成域名证书私钥

openssl genrsa -des3 -out *.njduck.com.pem 1024

5. 将域名私钥解密生成key

openssl rsa -in *.njduck.com.pem -out *.njduck.com.key

6. 生成证书请求

openssl req -new -key *.njduck.com.pem -out *.njduck.com.csr

7. 证书签名

openssl ca -policy policy_anything -days 1460 -cert ca.crt -keyfile ca.key\
    -in *.njduck.com.csr -out *.njduck.com.crt

CA证书生成后可以直接从第4步开始给其他域名生成证书

I’ll be back

Boracay, Philippines

Excel小技巧

=IF(EXACT(WEEKDAY(A10,2),"1"),"一",IF(EXACT(WEEKDAY(A10,2),"2"),"二",IF(EXACT(WEEKDAY(A10,2),"3"),"三",IF(EXACT(WEEKDAY(A10,2),"4"),"四",IF(EXACT(WEEKDAY(A10,2),"5"),"五",IF(EXACT(WEEKDAY(A10,2),"6"),"六",IF(EXACT(WEEKDAY(A10,2),"7"),"日","")))))))

下载整站数据

wget -c -r -np -k -L -p http://xxx.yyy.zzz

配置HBase单机版

配置JAVA_HOME

编辑conf/hbase-env.sh，指定包含/bin/java的路径为JAVA_HOME

export JAVA_HOME=/usr

编辑HBase主配置文件

conf/hbase-site.xml

<configuration>
  <property>
    <name>hbase.rootdir</name>
    <value>file:///home/ubuntu/hbase/hbase</value>
  </property>
  <property>
    <name>hbase.zookeeper.property.dataDir</name>
    <value>/home/ubuntu/hbase/zookeeper</value>
  </property>
  <property>
    <name>hbase.unsafe.stream.capability.enforce</name>
    <value>false</value>
    <description>
      Controls whether HBase will check for stream capabilities (hflush/hsync).

      Disable this if you intend to run on LocalFileSystem, denoted by a rootdir
      with the 'file://' scheme, but be mindful of the NOTE below.

      WARNING: Setting this to false blinds you to potential data loss and
      inconsistent system state in the event of process and/or node failures. If
      HBase is complaining of an inability to use hsync or hflush it's most
      likely not a false positive.
    </description>
  </property>
</configuration>

启动HBase

执行bin/start-hbase.sh

启用ssh的公钥连接，禁用密码连接

系统

ubuntu 16.04 64bit

步骤

服务器的~/目录新建文件夹.ssh，权限0700
上传公钥到服务器的~/.ssh/目录，重命名为authorized_keys，权限为0644
编辑/etc/ssh/sshd_config

PubkeyAuthentication yes
PasswordAuthentication no

重启服务器

reboot

愉快的玩耍吧～

ssh -i [PrivateKey] [root@]server

给Ubuntu下的Chromium浏览器添加Flash插件

sudo apt-get install pepperflashplugin-nonfree
sudo update-pepperflashplugin-nonfree --install