Eric Guo's

in HTML5, JavaScript, Ruby & Rails, Python, and Cloud MES!

Prepare the 16 kHz Monaural MP3 for Wechat API Speach to Text Interface


ffmpeg -i test_voice.amr -acodec mp3 -ac 1 -ar 16000 test_voice.mp3

微信AI开放接口, require that interface.

How to install in CentOS 7 from source code

yum install nasm
cd /usr/local/src
tar -zxvf lame-3.100.tar.gz
cd lame-3.100
./configure --prefix=/usr/local
make && make install
ln -s /usr/local/lib/ /usr/lib64/
tar -jxvf ffmpeg-snapshot.tar.bz2
cd ffmpeg
./configure --prefix=/usr/local --enable-libmp3lame
make && make install

Original post

How to Resolve Rails Test:system Long Time Pending Using Chromedriver


Running rails test:system in my local dev always pending and timeout problem haunted me for a long time, finally, I know why.

Due to some change introduced in Google, every time a new chromedriver installed using brew, the first time running always need to download a file from but due to there is GFW in China, it always pending.

So resolved is quite simple, make sure you running ruby.exe(or binary of ruby) when first time can access google site and that’s it.

You need to make sure only once per every new version, that’s it!

Allow New User to Login From Remote in Percona Server


Allow remote connect

vi /etc/my.cnf # bind-address =
systemctl restart mysqld
netstat -lnp | grep mysql # confirm 3306 is listened
firewall-cmd --add-service=mysql --permanent
firewall-cmd --reload

Add user

mysql -u root -p # input password if required
CREATE DATABASE cybros_bi character set UTF8mb4 collate utf8mb4_bin;
CREATE USER 'cybros_bi'@'%' IDENTIFIED BY 'cybros_bi_password';
GRANT ALL ON cybros_bi.* TO 'cybros_bi'@'%';

Install Pentaho Data Integration on MacOS 10.14.5 Mojave


It’s a little hard to find out the root cause why out of box Pentaho Data Integration not working, any way, it’s resolved.

First need java 8 to install, because Oracle refuse to provide, need OpenJDK instead.

brew tap adoptopenjdk/openjdk
brew cask install adoptopenjdk8
brew install jenv # If also want to using other java version
cd "/Applications/Data"
cat JavaApplicationStub

Also need change JavaApplicationStub file as below. (Maybe Pentaho developer didin’t having a MBP…)

# PROG_DIR=$(cd "$(dirname "$0")"; pwd)
# PROG_DIR is in .app/Contents/MacOS
# BASE_DIR="$PROG_DIR"/../../../
cd "$BASE_DIR"
echo $BASE_DIR
. "spoon.command" "$BASE_DIR"

If you want to continue using Java 12 in system wide, install brew install jenv and running jenv local 1.8 at data-integration folder.

Using Aliyun OSS as CDN for the Rails Application


用Rails做企业官网虽然不是现在的流行方式,但是考虑到Rails的灵活性和后端开发的方便性,在某些情况下,还是相比现在最火的JAM gatsby.js更实际。


| |
<cache> <no cache>
| |
[200] <>
[Nginx location /assets]
[200] --> [CDN Cache]

配置方法也非常简单,新建一个OSS Bucket,例如上图中的名字thape-assets

最后在Rails中的 config/environments/production.rb 中,启用新的OSS地址即可。

# Enable serving of images, stylesheets, and JavaScripts from an asset server.
config.action_controller.asset_host = ''

CentOS Rails Server With Oracle on VMware Installation Log


First CentOS server installed in VMware as thape SSO server.

Install software in root account

Update system

Run as root:

yum update
yum install -y git zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel
rpm -ivh epel-release-latest-7.noarch.rpm
yum --enablerepo=epel install htop

As VMware admin required, not disable the PermitRootLogin in /etc/ssh/sshd_config

Setup a user account

adduser deployer
gpasswd -a deployer wheel
visudo # add deployer ALL=(ALL) NOPASSWD: ALL at end
sudo su - deployer
mkdir .ssh
chmod 700 .ssh
vi .ssh/authorized_keys
chmod 600 .ssh/authorized_keys

Also disable root login and password via PermitRootLogin in /etc/ssh/sshd_config

Before exis, make sure you can login via ssh deployer@ip_address, other wise, check file permission.

Install rbenv and ruby-build

cd # as a deployer
git clone git:// .rbenv
cd ~/.rbenv && src/configure && make -C src
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
~/.rbenv/bin/rbenv init
# As an rbenv plugin
mkdir -p "$(rbenv root)"/plugins
git clone "$(rbenv root)"/plugins/ruby-build

Install Ruby 2.6.3

rbenv install -l
rbenv install 2.6.3
rbenv global 2.6.3
echo 'eval "$(rbenv init -)"' >> ~/.bash_profile
echo "gem: --no-document" > ~/.gemrc
gem install bundler
gem install bundler -v 1.17.3

Install Javascript Runtime

Run as root:

curl -sL | bash -
sudo yum install nodejs
curl -sL | sudo tee /etc/yum.repos.d/yarn.repo
sudo yum install yarn
# if you behind GFW
npm config set registry --global
npm config set disturl --global
yarn config set registry --global
yarn config set disturl --global

Install nginx

sudo yum install epel-release
sudo yum install nginx
chkconfig nginx on
sudo firewall-cmd --add-service=http --permanent
sudo firewall-cmd --add-service=https --permanent
sudo firewall-cmd --reload

Fix permission for CentOS

sudo mkdir /var/www
cd /var/www
sudo mkdir cybros
sudo chown deployer:deployer cybros/

and disable selinux(,

or further read nginx permission denied

Install Oracle Instant Client

Download Version and following ruby-oci8 document

sudo rpm -i ./oracle-instantclient12.2-basic-
sudo rpm -i ./oracle-instantclient12.2-devel-
sudo rpm -i ./oracle-instantclient12.2-sqlplus-
cd /usr/local/bin
sudo ln -s /usr/bin/sqlplus64 sqlplus
export LD_LIBRARY_PATH=/usr/lib/oracle/12.2/client64/lib
gem install ruby-oci8
Append to ~/.bashrc
export LD_LIBRARY_PATH=/usr/lib/oracle/12.2/client64/lib
export NLS_LANG=en_US.UTF-8

Install FreeTDS to connect to SQL Server

sudo su -
tar -xzf freetds-1.00.111.tar.gz
cd freetds-1.00.111
./configure --prefix=/usr/local --with-tdsver=7.3
make install
logout # as deployer
gem install tiny_tds

Install MySQL

Install the percona server via yum.

After install, do the secure installation for root.

mysql -u root -p
CREATE DATABASE cybros_prod character set UTF8mb4 collate utf8mb4_bin;
CREATE USER 'cybros_prod'@'localhost' IDENTIFIED BY 'new_password';
GRANT ALL ON cybros_prod.* TO 'cybros_prod'@'localhost';

Install Ruby on Rails Production Based on Amazon Linux 2 AMI (HVM)


Based my last rbenv and CentOS Ruby on Rails production environment install log, but this time on AWS!

But will only record the difference as below:

Run sudo amazon-linux-extras install nginx1.12 instead of sudo yum install nginx to install nginx.

Seems AMI provide their own version of below package.

0 ansible2 available [ =2.4.2 =2.4.6 ]
2 httpd_modules available [ =1.0 ]
3 memcached1.5 available [ =1.5.1 ]
4 nginx1.12=latest enabled [ =1.12.2 ]
5 postgresql9.6 available [ =9.6.6 =9.6.8 ]
6 postgresql10 available [ =10 ]
8 redis4.0 available [ =4.0.5 =4.0.10 ]
9 R3.4 available [ =3.4.3 ]
10 rust1 available \
[ =1.22.1 =1.26.0 =1.26.1 =1.27.2 =1.31.0 ]
11 vim available [ =8.0 ]
13 ruby2.4 available [ =2.4.2 =2.4.4 ]
15 php7.2 available \
[ =7.2.0 =7.2.4 =7.2.5 =7.2.8 =7.2.11 =7.2.13 =7.2.14 ]
16 php7.1 available [ =7.1.22 =7.1.25 ]
17 lamp-mariadb10.2-php7.2 available \
[ =10.2.10_7.2.0 =10.2.10_7.2.4 =10.2.10_7.2.5
=10.2.10_7.2.8 =10.2.10_7.2.11 =10.2.10_7.2.13
=10.2.10_7.2.14 ]
18 libreoffice available [ = = ]
19 gimp available [ =2.8.22 ]
20 docker=latest enabled \
[ =17.12.1 =18.03.1 =18.06.1 ]
21 mate-desktop1.x available [ =1.19.0 =1.20.0 ]
22 GraphicsMagick1.3 available [ =1.3.29 ]
23 tomcat8.5 available \
[ =8.5.31 =8.5.32 =8.5.38 ]
24 epel available [ =7.11 ]
25 testing available [ =1.0 ]
26 ecs available [ =stable ]
27 corretto8 available [ =1.8.0_192 =1.8.0_202 ]
28 firecracker available [ =0.11 ]
29 golang1.11 available [ =1.11.3 ]
30 squid4 available [ =4 ]
31 php7.3 available [ =7.3.2 ]
32 lustre2.10 available [ =2.10.5 ]

OpenID Connect Learning Notes


最近在做面向大中型企业的 oauth2id 方案,这个领域有很多术语,比如OAuth2, OpenID Connect,同时也有很多相同概念的术语,例如SSO(Single Sign On),CAS(Central Authentication Service)

中文的资料相当少,入门性的有阮一峰的理解OAuth 2.0,英文资料较多: