如何在没有日志的情况下在后台运行dockerd

Question

我正在使用franela/dind图像来获取 bash：

docker run --rm --privileged -it franela/dind bash

*确保删除/etc/docker/daemon.json运行前dockerd 。

我在里面运行了dockerd ，它开始打印大量日志：

WARN[2019-02-24T13:40:16.902536038Z] could not change group /var/run/docker.sock to docker: group docker not found 
INFO[2019-02-24T13:40:16.922239343Z] libcontainerd: started new docker-containerd process  pid=880
INFO[2019-02-24T13:40:16.922290278Z] parsed scheme: "unix"                         module=grpc
INFO[2019-02-24T13:40:16.922302876Z] scheme "unix" not registered, fallback to default scheme  module=grpc
INFO[2019-02-24T13:40:16.922360290Z] ccResolverWrapper: sending new addresses to cc: [{unix:///var/run/docker/containerd/docker-containerd.sock 0  <nil>}]  module=grpc
INFO[2019-02-24T13:40:16.922373417Z] ClientConn switching balancer to "pick_first"  module=grpc
INFO[2019-02-24T13:40:16.922423556Z] pickfirstBalancer: HandleSubConnStateChange: 0xc4203c96e0, CONNECTING  module=grpc
INFO[0000] starting containerd                           revision=468a545b9edcd5932818eb9de8e72413e616e86e version=v1.1.2
INFO[0000] loading plugin "io.containerd.content.v1.content"...  type=io.containerd.content.v1
INFO[0000] loading plugin "io.containerd.snapshotter.v1.btrfs"...  type=io.containerd.snapshotter.v1

我试图在没有日志的情况下运行它，但我尝试的一切都无济于事：

# run as a background process
dockerd &  
# redirect the output to /dev/null
dockerd > /dev/null
# try to remove the logs with the --log-level switch
dockerd --log-level error  

如何在没有所有这些日志的情况下运行dockerd服务？ 使其处于安静模式。

Answer 1

来自dockerd的日志被打印到stderr 。 您可以将其重定向到一个文件并在后台运行它，如下所示：

sudo docker run --privileged --rm -ti --entrypoint sh docker:18-dind

dockerd &> dockerd-logfile &

# check out the log stream, to cancel use ctrl+c
tail dockerd-logfile

# just to see it's still running
ps -ef

当然你也可以丢弃所有类似于你已经尝试过的日志： dockerd &> /dev/null &