/etc/docker/daemon.json 是 docker 的配置文件，默认是没有的，需要我们手动创建，可配置项如下：
[root@localhost ~]$ vim /etc/docker/daemon.json { "authorization-plugins": [], "data-root": "", # 设置docker运行时的根目录 "dns": [], # 设置容器的DNS地址 "dns-opts": [], # 设置容器的/etc/resolv.conf文件 "dns-search": [], "exec-opts": [], "exec-root": "", "experimental": false, "features": {}, "storage-driver": "", "storage-opts": [], "labels": [], "live-restore": true, "log-driver": "json-file", "log-opts": { "max-size": "10m", "max-files":"5", "labels": "somelabel", "env": "os,customer" }, "mtu": 0, "pidfile": "", # 设置docker守护进程的PID文件 "cluster-store": "", "cluster-store-opts": {}, "cluster-advertise": "", "max-concurrent-downloads": 3, "max-concurrent-uploads": 5, "default-shm-size": "64M", "shutdown-timeout": 15, "debug": true, # 是否以debug模式启动docker "hosts": [], # 设置容器的hosts "log-level": "", "tls": true, "tlsverify": true, "tlscacert": "", "tlscert": "", "tlskey": "", "swarm-default-advertise-addr": "", "api-cors-header": "", "selinux-enabled": false, # 设置是否支持SELinux "userns-remap": "", "group": "", "cgroup-parent": "", "default-ulimits": { "nofile": { "Name": "nofile", "Hard": 64000, "Soft": 64000 } }, "init": false, "init-path": "/usr/libexec/docker-init", "ipv6"