Kelvin's tech-box

Kelvin Li

Tips for git repository migration to other server

Recently I am going to use the private git repository that hosting on the webfactionfrom my own server. During the migration I met some issues, here are some tips should be noticed. When create the new repository, don't forget: git config http.receivepack true If you are using

How to push to multiple git repositories at one time

I have 2 different repositories on the different servers, now I want one of them to be the backup. Two solutions are in my mind. 1. Sync the repository periodically 2. Each time when push the changes, both of the repositoy should be pushed Here you can follow this handy

Tar command usage

Create the tar file tar -czvp -f archive.tar.gz foo bar Create archive.tar.gz from files foo and bar with the preserved permission tar -cjvp -f archive.tar.bz2 foo bar How to split the file: split -b 4000k archive.tar.gz archive.20120829.tar.gz. -verbose creating

Install PIL on Ubuntu

Sometimes it's hard to install PIL on ubuntu, here are the tips to help fixing the install issue: Install the build dependencies sudo apt-get build-dep python-imaging Symlink the libraries: sudo ln -s /usr/lib/uname -i-linux-gnu/libfreetype.so /usr/lib/ sudo ln -s /usr/lib/uname -i-linux-gnu/libjpeg.

Setup Postgres on Ubuntu

Here is the brief step to setup the postgresql database on Ubuntu. Install sudo apt install postgresql postgresql-contrib sudo systemctl start postgresql.service Using postgres Roles and Database A default user account postgres is associated with role. sudo -i -u postgres psql postgres=# \q Create new role createuser --interactive or

Delete files with find results

When you tried to delete all files with the name abc.txt under the folder /home/kelvin, try the following commands(one of them works): find /home/kelvin -name abc.txt | xargs rm -rf find /home//kelvin -name abc.txt -exec rm -fv {} \; Refer the doc: http://www.linuxsir.org/

制作，编译和使用静态库

很多情况下，我们从网上得到的是一个纯C的代码包，他们这些库，往往是各种平台通用，代码包svn checkout出来后，里面有makefile, vcproject file 等。但往往我们先README看过之后，通过 ./configure make make install 来实现编译生成了一个库。（注意一些基本语法 ./confiure后如果带 --prefix=/path/to/your/custom/dir 表明自定义安装路径。）那么在这样的情况下，我们第一个首先会遇到的问题，就是这个库格式不兼容。我们添加了这个库到project后编译时，显示 this file format doesn't support (i386)。这个情况，是由于大部分snow leopard是INTEL DUO CPU，双核x86_64的，一般很多库，不加特别标注，都以为你开发了为MAC电

Start service automatically on linux server

Add the service as automatically startup 1. copy the startup script to /etc/init.d 2. sudo chmod 755 /etc/init.d/your_script 3. run the following commonds cd /etc/init.d sudo upate-rc.d your_script defaults xx(xx is the start sequence number) Remove the startup service

Enable the remote connection to the MySQL DB on Ubuntu Server

Create a MySQL user mysql> GRANT ALL PRIVILEGES ON remote.* TO remote@"%" IDENTIFIED BY "remotepwd"; Change the /etc/mysql/my.cnf disable the bind-address = 127.0.0.1 Restart the DB sudo /etc/init.d/mysql restart Done.

How to use the SSH in the proxy env

Sometimes you are working in the coperation dev environemnt and you found you stay behind the firewall, some ports are blocked, such as 22, and you have to access internet via corperation proxy server, but you do need to use ssh to connect some site outside of office. This post