ubuntu16.04 升级nginx

在 /etc/apt/sources.list.d/ 下添加一个 nginx.list 文件，内容如下

deb http://nginx.org/packages/mainline/ubuntu/ xenial nginx
deb-src http://nginx.org/packages/mainline/ubuntu/ xenial nginx

添加 nginx 的 key，并更新 apt,执行下面两行命令:

curl http://nginx.org/keys/nginx_signing.key | sudo apt-key add
sudo apt update

需要注意的是，Ubuntu 自带的 nginx 系列模组会干扰nginx本体安装，所以先备份配置文件，删除ubuntu的默认模组，再重装nginx

依次执行下面5行命令:

sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak
sudo apt remove nginx nginx-common nginx-full nginx-core
sudo apt install nginx
sudo rm /etc/nginx/nginx.conf
sudo cp /etc/nginx/nginx.conf.bak /etc/nginx/nginx.conf

另外一点是此时 nginx 被 mask 了……解除并重启它：执行下面两行命令:

sudo systemctl unmask nginx
sudo systemctl start nginx

 测试无误后，加上重启自启动

sudo systemctl enable nginx