Eureka

安装

sudo apt-get install -y python3-pip build-essential python3-dev python3-setuptools python3-wheel

sudo pip3 install https://github.com/shadowsocks/shadowsocks/archive/master.zip

配置

sudo mkdir /etc/shadowsocks
sudo nano /etc/shadowsocks/config.json

输入以下内容：

{
    “server”:”::”,
    “server_port”:8888,
    “local_address”: “127.0.0.1”,
    “local_port”:1080,
    “password”:”password”,
    “timeout”:300,
    “method”:”aes-256-cfb”,
    “fast_open”: true
}

添加systemd服务

sudo nano /etc/systemd/system/shadowsocks-server.service

输入以下内容：

[Unit]
Description=Shadowsocks Server
After=network.target

[Service]
ExecStartPre=/bin/sh -c ‘ulimit -n 51200’
ExecStart=/usr/local/bin/ssserver -c /etc/shadowsocks/config.json
Restart=on-abort

[Install]
WantedBy=multi-user.target

优化

sudo apt-get update
sudo apt-cache showpkg linux-image | grep generic

找到内核版本大于4.9的目标内核，例如：linux-image-4.15.0-38-generic，安装新内核

sudo apt-get install -y linux-image-4.15.0-38-generic

安装完成后重启，进入系统后删除就内核

sudo reboot

sudo purge-old-kernels

开启BBR

modprobe tcp_bbr
echo “tcp_bbr” >> /etc/modules-load.d/modules.conf

echo “net.core.default_qdisc=fq” >> /etc/sysctl.conf
echo “net.ipv4.tcp_congestion_control=bbr” >> /etc/sysctl.conf

sysctl -p

检查是否开启成功，若以下两个命令返回值中有bbr则代表成功

sysctl net.ipv4.tcp_available_congestion_control
sysctl net.ipv4.tcp_congestion_control

优化吞吐量

sudo nano /etc/sysctl.d/local.conf

# max open files
fs.file-max = 51200
# max read buffer
net.core.rmem_max = 67108864
# max write buffer
net.core.wmem_max = 67108864
# default read buffer
net.core.rmem_default = 65536
# default write buffer
net.core.wmem_default = 65536
# max processor input queue
net.core.netdev_max_backlog = 4096
# max backlog
net.core.somaxconn = 4096

# resist SYN flood attacks
net.ipv4.tcp_syncookies = 1
# reuse timewait sockets when safe
net.ipv4.tcp_tw_reuse = 1
# turn off fast timewait sockets recycling
net.ipv4.tcp_tw_recycle = 0
# short FIN timeout
net.ipv4.tcp_fin_timeout = 30
# short keepalive time
net.ipv4.tcp_keepalive_time = 1200
# outbound port range
net.ipv4.ip_local_port_range = 10000 65000
# max SYN backlog
net.ipv4.tcp_max_syn_backlog = 4096
# max timewait sockets held by system simultaneously
net.ipv4.tcp_max_tw_buckets = 5000
# turn on TCP Fast Open on both client and server side
net.ipv4.tcp_fastopen = 3
# TCP receive buffer
net.ipv4.tcp_rmem = 4096 87380 67108864
# TCP write buffer
net.ipv4.tcp_wmem = 4096 65536 67108864
# turn on path MTU discovery
net.ipv4.tcp_mtu_probing = 1

net.ipv4.tcp_congestion_control = bbr

sysctl –system

启动服务并设置开机启动

sudo systemctl enable shadowsocks-server
sudo systemctl start shadowsocks-server

自建了Gitlab服务器，为了使用邮件发送（密码找回、验证等等），可以直接使用腾讯企业邮箱或其他国内免费邮箱作为发送服务器，而不必架设Postfix等邮箱服务器。

以腾讯企业邮箱为例说明：

修改配置文件/etc/gitlab/gitlab.rb

gitlab_rails['gitlab_email_from'] = 'xxx@xxx.com.cn'
gitlab_rails['gitlab_email_reply_to'] = 'noreply@xxx.com.cn'

gitlab_rails['smtp_enable'] = true
gitlab_rails['smtp_address'] = "smtp.exmail.qq.com"
gitlab_rails['smtp_port'] = 465
gitlab_rails['smtp_user_name'] = "xxx@xxx.com.cn"
gitlab_rails['smtp_password'] = "xxxxxx"
gitlab_rails['smtp_domain'] = "exmail.qq.com"
gitlab_rails['smtp_authentication'] = "login"
gitlab_rails['smtp_enable_starttls_auto'] = true
gitlab_rails['smtp_tls'] = true

修改完成后，运行gitlab-ctl reconfigure，然后运行gitlab-rails console，进入控制台后运行以下命令测试设置是否正确和生效：

irb(main):003:0> Notify.test_email('xxx@xxx.com', 'Message Subject', 'Message Body').deliver_now

其中xxx@xxx.com为接收人的邮箱，如果该邮箱成功收到邮件则说明设置成功。

在Ubuntu14.04中使用了官方的驱动，自带了校屏工具。系统升级到Ubuntu16.04后没有再使用官方驱动，内核中已经自带了驱动，工作良好。经过摸索，校屏方法同样很简单。

一条命令搞定，实时生效，不需要重启系统：

xinput_calibrator --output-filename /usr/share/X11/xorg.conf.d/99-calibration.conf

Ubuntu 16.04环境下搭建Git服务器

（1）安装apache2

sudo apt-get install apache2

（2）安装cgit

git clone https://git.zx2c4.com/cgit
cd cgit
git submodule init
git submodule update
make
sudo make install

依赖项

sudo apt-get install build-essential
sudo apt-get install libssl–dev

（3）配置apache2

启用模块

sudo a2enmod cgid

添加/etc/apache2/conf-available/cgit.conf

ScriptAlias /cgit/ “/var/www/htdocs/cgit/cgit.cgi/”
RedirectMatch ^/cgit$ /cgit/
Alias /cgit-css “/var/www/htdocs/cgit/”
<Directory “/var/www/htdocs/cgit/”>
AllowOverride None
Options ExecCGI FollowSymlinks
Require all granted
</Directory>

启用cgit.conf

sudo ln -sf ../conf-available/cgit.conf cgit.conf

（4）配置cgit

/etc/cgitrc

#
# cgit config
# see cgitrc(5) for details

css=/cgit-css/cgit.css
logo=/cgit-css/cgit.png

repo.url=test.git
repo.path=/var/www/htdocs/cgit/test.git
repo.desc=the master test repository
repo.owner=test@example.com
repo.readme=info/web/about.html

 

运行环境：Ubuntu 16.04

网络管理：NetworkManager

网络：eth0 —> 局域网，Wifi —> 外网

默认情况下，eth0为默认路由，需要将wifi设置为默认路由，使用NetworkManager最简单的修改方法如下：

打开网络管理器，在eth0路由设置里将”Use this connection only for resources on its network”勾选中，IPv4和IPv6均设置。