描述
刚入手Ubuntu，发现各种不适。使用Xshell连接Ubuntu（装在虚拟机下18.04.3）怎么也连接不上。
排查问题
查看防火墙设置
指令
sudo ufw status
发现我的是关了防火墙的。
Ubuntu主机没有开启SSH服务
开启指令
sudo apt-get install openssh-server
安装该SSH服务后，可以连接Ubuntu系统。
更换Ubuntu的apt源为国内源
进入编辑目录
命令
sudo vim /etc/apt/sources.list
中科大
命令
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
阿里云源
指令
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
生效命令
sudo apt-get update
sudo apt-get upgrade
docker常用命令
操作tomcat
拉取镜像
docker pull tomcat
启动tomcat
docker run --name tomcat1 -d -p 8080:8080 tomcat
查看是否启动成功
docker ps -a
操作Nginx
拉取镜像
docker pull nginx
启动Nginx
docker run --name nginx -d -p 80:80 nginx
操作mysql
拉取镜像
docker pull mysql
启动mysql
docker run --name mysql01 -e MYSQL_ROOT_PASSWORD=123456 -d -p 3306:3306 mysql
参考
https://www.cnblogs.com/yadongliang/p/8663146.html
来源：oschina
链接：https://my.oschina.net/u/3193075/blog/3096175