docker容器自动重启

在使用容器部署应用时，有时候需要设置容器在异常退出后的重启策略，有如下办法：

• 启动容器时指定重启策略

docker run --restart=always -d nginx

• 更新已存在容器重启策略

docker update --restart=always  7aab

Docker supports the following restart policies:

Policy	Result
no	Do not automatically restart the container when it exits. This is the default.
on-failure[:max-retries]	Restart only if the container exits with a non-zero exit status. Optionally, limit the number of restart retries the Docker daemon attempts.
always	Always restart the container regardless of the exit status. When you specify always, the Docker daemon will try to restart the container indefinitely. The container will also always start on daemon startup, regardless of the current state of the container.
unless-stopped	Always restart the container regardless of the exit status, including on daemon startup, except if the container was put into a stopped state before the Docker daemon was stopped.