防火墙知识
1 2 3 4 5 6 7 | - 安装:sudo apt-get install ufw - 查看状态:sudo ufw status - 开启/关闭:sudo ufw enable | disable - 默认允许/禁止:sudo ufw default allow | deny - 允许/禁止:sudo ufw allow|deny 服务 | port,如:sudo ufw deny 22 - 移除规则:sudo ufw delete deny 22 - 允许范围端口:sudo ufw allow 5901:5999/tcp |
ubuntu — apt-get install的时候提示unable to locate package
由于ubuntu镜像一般默认自带的都是us的官方源http://us.archive.ubuntu.com,和http://security.ubuntu.com。这些镜像源的地址在中国大多数难以连接,因此需要换国内的源,国内的源有网易源、阿里源、科大源等等,替换阿里源。
1 2 3 4 | sudo su #输入密码 cd /etc/apt #切换到apt源文件 mv sources.list sources.list_bak #备份源文件 vim sources.list #新建一个,然后将下面的内容copy进去 |
- 替换全部为一下内容
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | # deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial universe deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties deb http://archive.canonical.com/ubuntu xenial partner deb-src http://archive.canonical.com/ubuntu xenial partner deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse |
- 保存,然后执行
1 | sudo apt-get update |
xshell 连接 ubuntu
如果没安装 ssh 服务 会报错 Could not connect to ‘192.168.216.152’ (port 22): Connection failed.
1 2 3 4 5 | sudo apt-get install openssh-service 或者 1. sudo apt update 2. sudo apt upgrade 3. sudo apt install -y openssh-server |
- 测试
1 | ssh localhost |
VI时,方向键按下去后变成ABCD,删除键无效(重新安装)
1 2 | sudo apt-get remove vim-common sudo apt-get install vim |