memcached 安装
sudo apt-get install memcached
memcached 参数说明
memcached -d -m 50 -p 11211 -u root
-m 指定使用多少兆的缓存空间；-p 指定要监听的端口； -u 指定以哪个用户来运行
安装php-memcache模块
sudo apt-get install php5-memcache
编辑配置文件
sudo vi /etc/php5/conf.d/memcache.ini
;uncomment the next line to enable the module
extension=memcache.so
[memcache]
memcache.dbpath=”/var/lib/memcache”
memcache.maxreclevel=0
memcache.maxfiles=0
memcache.archivememlim=0
memcache.maxfilesize=0
memcache.maxratio=0
update-grub command not found：apt-get update; apt-get install –reinstall grub
mkdir /boot/grub
update-grub
Add a “non-free” component to /etc/apt/sources.list, for example:
Debian 8 “Jessie”
deb http://httpredir.debian.org/debian/ jessie main contrib non-free
Update the list of available packages and install the firmware-realtek package:
apt-get update && apt-get install firmware-realtek
apt-get update
apt-get install network-manager-gnome
reboot
apt-get install guvcview
rm -rf ~/.config/xfce4/panel
rm -rf ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-panel.xml
reboot
Linux或freebsd，如果是vps，好像必须得是KVM的才能查看。
SSD是非转动磁盘
cat /sys/block/sda/queue/rotational
返回 0, 就是 SSD。
最近安装了Archlinux发现Xterm终端不支持中文，中文显示乱码。google了半天，终于找到了答案
首先，编辑~/.Xresources文件，添加一下三句：
–英文字体
xterm*faceName:DejaVu Sans Mono:antialias=True:pixelsize=14
–中文字体
xterm*faceNameDoublesize:WenQuanYi Micro Hei:antialias=True:pixelsize=14
Xterm*locale:zh_CN.UTF-8
其中的DejaVu Sans Mono和WenQuanYi Micro Hei是我的字体文件，查看本机上安装的字体使用fc-list命令查看，将第二行WenQuanYi Micro Hei改为你安装的中文字体，修改完成之后在终端下输入命令：
xrdb -merge ~/.Xresources
重新加载你的终端配置文件，好了，大功告成。终端可以显示中文了
apt-get update 出现 这种错误
Reading package lists… Done
W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following key IDs:
9D6D8F6BC857C906
解决方法
apt-get install debian-keyring debian-archive-keyring
apt-get update
Depends: init-system-helpers (>= 1.18~) but it is not installable
E: Unable to correct problems, you have held broken packages.
Working on debian wheezy…
I added backports to my apt repo “deb http://ftp.de.debian.org/debian wheezy-backports main” and performed a “apt-get update”. Afterwards, the apt-get install docker-engine completed fine.
Personally, I’m leaving backports commented out for now but in my conf as a reminder…
In Red Hat based distributions such as Fedora and CentOS, make use of a script called ‘chkconfig‘ to enable and disable the running services in Linux.
For example, lets disable the Apache web server at the system startup.
[avishek@tecmint]# chkconfig httpd off
[avishek@tecmint]# chkconfig httpd –del
In Debian based distributions such as Ubuntu, Linux Mint and other Debian based distributions use a script called update-rc.d.
For example, to disable the Apache service at the system startup execute the following command. Here ‘-f’ option stands for force is mandatory.
[avishek@tecmint]# update-rc.d -f a