Dec 8, 2013
Technology###Python Preparation
Install python
$ pacman -S python
Install pip
$ pacman -S python-pip
Install virtualenv, before install virtualenv, be sure to update your time. 1970’s time will get ssl error.
$ date -s "8 Dec 2013 16:09:40"
$ pip install --upgrade virtualenv virtualenvwrapper
Prepare virtualenv:
[root@alarmpi ~]# mkdir ~/pyv
[root@alarmpi ~]# vim ~/.virtualenvrc
export WORKON_HOME="/root/pyv"
export PROJECT_HOME="/root/pyv"
source /usr/bin/virtualenvwrapper.sh
[root@alarmpi ~]# source ~/.virtualenvrc
Now your virtualenv is OK. Make a virtualenv for python2.7
$ mkvirtualenv --python=/usr/bin/python2.7 v27
cdvirtualenv
Add environment variables into your ~/.bashrc
export WORKON_HOME=$HOME/pyv
export PIP_VIRTUALENV_BASE=$WORKON_HOME
source /usr/bin/virtualenvwrapper.sh
Next time if you want to enter virtualenv, simply type:
$ workon v27
Install rpi.gpio
$ pip install rpi.gpio
###Use rpi.gpio on raspberryPI
TBD. I don’t know why but my raspberyPI can’t work properly on 1602 LCD. So I begin to test GPIO
###Use WiringPi for programming
Preparation:
$ pacman -S git gcc make
Download the packages:
$ git clone git://git.drogon.net/wiringPi
$ cd wiringPi
$ git pull origin
$ ./build
Testing the WiringPi:
[root@alarmpi gpio]# ./gpio readall
+----------+-Rev1-+------+--------+------+-------+
| wiringPi | GPIO | Phys | Name | Mode | Value |
+----------+------+------+--------+------+-------+
| 0 | 17 | 11 | GPIO 0 | OUT | High |
| 1 | 18 | 12 | GPIO 1 | IN | Low |
| 2 | 21 | 13 | GPIO 2 | IN | Low |
| 3 | 22 | 15 | GPIO 3 | IN | Low |
| 4 | 23 | 16 | GPIO 4 | IN | Low |
| 5 | 24 | 18 | GPIO 5 | IN | Low |
| 6 | 25 | 22 | GPIO 6 | IN | Low |
| 7 | 4 | 7 | GPIO 7 | IN | Low |
| 8 | 0 | 3 | SDA | ALT0 | High |
| 9 | 1 | 5 | SCL | ALT0 | High |
| 10 | 8 | 24 | CE0 | ALT0 | High |
| 11 | 7 | 26 | CE1 | ALT0 | High |
| 12 | 10 | 19 | MOSI | ALT0 | Low |
| 13 | 9 | 21 | MISO | ALT0 | Low |
| 14 | 11 | 23 | SCLK | ALT0 | Low |
| 15 | 14 | 8 | TxD | ALT0 | High |
| 16 | 15 | 10 | RxD | ALT0 | High |
+----------+------+------+--------+------+-------+
Simply testing a LED tutorial:
Wiring image:
Then Writing following script:
#!/bin/bash
/root/wiringPi/gpio/gpio mode 0 out
while true then
do
/root/wiringPi/gpio/gpio write 0 1
sleep 1
/root/wiringPi/gpio/gpio write 0 0
sleep 1
done
Now you will get a shining LED.
Dec 7, 2013
Technology###ALSA普通用户无声
只有root才能听到声音，其他一概是哑巴，解决方案：
$ sudo apt-get install acl
$ sudo setfacl -m u:Your_Username:rw /dev/snd/*
等于说赋予了普通用户(Your_Username)访问/dev/snd下所有设备的读写权限。这时候打开mplayer就可以听到MP3播放声了。
###使用tsocks和ssh转发穿越防火墙
ssh -qTfnN -D 1394 xxx@xxx.xxx.xxx.xxx
这样可以在本地打开一个socks代理，127.0.0.1:1394
安装tsocks
$ sudo apt-get install tsocks
配置tsocks
# vim /etc/tsocks.conf
# Local networks
# For this example this machine can directly access 192.168.0.0/255.255.255.0
# (192.168.0.*) and 10.0.0.0/255.0.0.0 (10.*)
local = 192.168.0.0/255.255.255.0
local = 10.0.0.0/255.0.0.0
server = 127.0.0.1
server_port = 1394
server_type = 5
试听音乐：
tsocks mplayer http://www.live365.com/play/wkhr
但是，用vlc总是提示失败。
###安装archlinux for raspberryPI
下载并解压得到img文件，而后：
[Trusty@XXXyyy arch_rasp]$ fdisk -l archlinux-hf-2013-07-22.img
Disk archlinux-hf-2013-07-22.img: 1.8 GiB, 1960837120 bytes, 3829760 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00057540
Device Boot Start End Blocks Id System
archlinux-hf-2013-07-22.img1 2048 186367 92160 c W95 FAT32 (LBA)
archlinux-hf-2013-07-22.img2 186368 3667967 1740800 5 Extended
archlinux-hf-2013-07-22.img5 188416 3667967 1739776 83 Linux
拷贝出根分区：
$ mount ./archlinux-hf-2013-07-22.img -o offset=96468992 /mnt
$ tar cjvf mnt.tar.bz2 /mnt
然后将mnt.tar.bz2解压到某硬盘分区，则可以用该硬盘启动raspberryPI
$ pacman -Syu --noconfirm
$ pacman -S tigervnc
$ pacman -S alsa-utils lxde mplayer vlc vim
$ pacman -S xf86-video-fbdev
$ pacman -S alsa-utils alsa-firmware alsa-lib alsa-plugins
$ pacman -S sudo
然后我们可以编辑出一个vncserver
$ vncserver
$ vim /root/.vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#twm &
startlxde &
$ vncserver -kill :1
$ vncserver
添加普通用户的权限和vnc:
$ visudo
root ALL=(ALL) ALL
Trusty ALL=(ALL) ALL
Trusty ALL=(ALL) NOPASSWD: ALL
###Start playing on boot
每次允许自动登录：
[Trusty@XXXyyy ~]$ sudo mkdir /etc/systemd/system/getty@tty1.service.d
[Trusty@XXXyyy ~]$ cat /etc/systemd/system/getty\@tty1.service.d/autologin.conf
[Service]
ExecStart=
ExecStart=-/usr/bin/agetty --autologin Trusty --noclear %I 38400 linux
安装screen
$ pacman -S screen
增加自定义服务：
[root@alarmpi ~]# cat /etc/systemd/system/radio.service
[Unit]
Description=My Radio
After=network.target
[Service]
RemainAfterExit=yes
ExecStart=/usr/bin/autoradio &
[Install]
WantedBy=multi-user.target
编写autoradio脚本：
[root@alarmpi ~]# cat /usr/bin/autoradio
#!/bin/bash
screen -d -m sudo -u Trusty cvlc --aout oss http://www.live365.com/play/wkhr --http-proxy=http://10.0.0.221:9001
如果想添加管理
[root@alarmpi ~]# cat /usr/bin/autoradio
#!/bin/bash
screen -d -m sudo -u Trusty cvlc --aout oss http://www.live365.com/play/wkhr --http-proxy=http://10.0.0.221:9001 --http-port=5202 --http-password=xxxxxx
好了，这个Internet Radio就写好了。Enjoy it!!!
Dec 6, 2013
Technology###Package Installation
Install virt-viewer for browsing the virtual machine desktop. For default spicec is not OK.
$ pacman -S gtk-vnc
$ yaourt -S spice-gtk3
$ yaourt -S virt-viewer
Install virt-manager
[root@DashArch Trusty]# pacman -S virt-manager
[root@DashArch Trusty]# systemctl start libvirtd.service
[root@DashArch Trusty]# systemctl enable libvirtd.service
ln -s '/usr/lib/systemd/system/libvirtd.service' '/etc/systemd/system/multi-user.target.wants/libvirtd.service'
[root@DashArch Trusty]# ps -ef | grep libvirt
root 8852 1 5 15:23 ? 00:00:00 /usr/bin/libvirtd -p /var/run/libvirtd.pid
###启动支持spice Server的qemu
-vga qxl -spice port=5988,disable-ticketing将使能spice
./run-qemu -boot d -m 1024 -enable-kvm -drive file=./fpgawindows.qcow2,if=ide -drive file=./fake.qcow2,if=virtio -cdrom ./virtio-win-0.1-74.iso -usb -vga qxl -spice port=5988,disable-ticketing -localtime
在本地或者远程访问spice server:
$ spice -h 127.0.0.1 -p 5988
但是ArchLinux上的X Server会出现问题，具体解决方案未明了。然而在Ubuntu上则是可以顺利访问的。
###启动支持VNC的Qemu
./run-qemu -boot d -m 1024 -enable-kvm -drive file=./fpgawindows.qcow2,if=ide -drive file=./fake.qcow2,if=virtio -cdrom ./virtio-win-0.1-74.iso -usb -vga std -nographic -localtime -vnc :33
启动后vncviewer :33则可连接到qemu的窗口
###启动Qemu，以std方式
全新启动：
./run-qemu -boot d -m 1024 -enable-kvm -drive file=./fpgawindows.qcow2,if=ide -drive file=./fake.qcow2,if=virtio -cdrom ./virtio-win-0.1-74.iso -usb -vga std -localtime `
保存状态： ctl+alt+2
$ savevm booted
启动到上一次保存的状态：
$ ./run-qemu -boot d -m 1024 -enable-kvm -drive file=./fpgawindows.qcow2,if=ide -drive file=./fake.qcow2,if=virtio -cdrom ./virtio-win-0.1-74.iso -usb -vga std -localtime --loadvm booted
Dec 6, 2013
TechnologyDownload the iso file from the redhat repository:
http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/images/images/bin/src/
Start the qemu with the following command :
./run-qemu -hda fpgawindows.qcow2 -m 1024 -cdrom ./virtio-win-0.1-74.iso -drive file=./fake.qcow2,if=ide
In run-qemu, the actual command is:
qemu-system-i386 -net nic,model=virtio,macaddr=$macaddr -net tap,ifname="$IFACE" $*
Then, follow the following images to operate:
Dec 5, 2013
TechnologyStrangely, I cannot enable the multiple SSH connections on OpenWRT.
The configuration file is listed as:
config autossh
option ssh '-N -T -R 4381:localhost:22 root@XXX.xxx.xxx.xxx '
option gatetime '0'
option monitorport '20000'
option poll '600'
#config autossh
# option ssh '-L -N -T 10.0.0.1:9009:1XX.XX.XX.XXX:8000 xxx@xxx.xxx.xxx.xxx '
# option gatetime '0'
# option monitorport '20001'
# option poll '600'
But only 1 connection could be enabled.
I doubt this is because of the startup scripts for /etc/init.d/autossh. I should change its methods.
start() {
config_load 'autossh'
config_foreach start_instance 'autossh'
}
But how to read and display the configuration files? It seems the multiple selections is hard to config…..
