Ubuntu 系统管理

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Ubuntu 服务器使用记录

系统时间

修改时区

Using the Command Line (terminal)

Using the command line, you can use sudo dpkg-reconfigure tzdata.

  1. sudo dpkg-reconfigure tzdata

  2. Follow the directions in the terminal.

  3. The timezone info is saved in /etc/timezone - which can be edited or used below

Using the Command Line (unattended)

  1. Find out the long description for the timezone you want to configure.

  2. Save this name to /etc/timezone

  3. run sudo dpkg-reconfigure --frontend noninteractive tzdata:

$ echo "Asia/Shanghai" | sudo tee /etc/timezone
Australia/Adelaide
$ sudo dpkg-reconfigure --frontend noninteractive tzdata

Current default time zone: 'Australia/Adelaide'
Local time is now:      Sat May  8 21:19:24 CST 2010.
Universal Time is now:  Sat May  8 11:49:24 UTC 2010.

This can be scripted if required.

NTP

$ timedatectl status
      Local time: Tue 2017-03-07 03:35:20 CST
  Universal time: Mon 2017-03-06 19:35:20 UTC
        RTC time: Mon 2017-03-06 19:35:20
       Time zone: Asia/Shanghai (CST, +0800)
 Network time on: yes
NTP synchronized: yes
 RTC in local TZ: no

iptables

若 INPUT 链预设是 DROP 或者 INPUT 链最后的规则只有 -j DROP，则必须在这条规则之前添加：

$ sudo iptables -I INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT

否则，Ubuntu 不能使用 apt-get 更新。

使用 iptables-save，必须像下面这样：

$ sudo sh -c "iptables-save > /etc/iptables.rules"