背景说明
daemon.json文件是docker的配置参数文件，默认文件不会自动创建，需要手动创建，docker不管以何种方式启动，默认都会读取这个配置文件，可以使得用户统一管理不同系统下的docker的daemon配置。
版本支持: docker1.3.1以上 文件绝对路径:/etc/docker/daemon.json
解决方案
官网地址
https://docs.docker.com/engine/reference/commandline/dockerd/
[root@vm1 ~]# dockerd --helpUsage: dockerd [OPTIONS]A self-sufficient runtime for containers.Options:--add-runtime runtime Register an additional OCI compatible runtime (default [])--allow-nondistributable-artifacts list Allow push of nondistributable artifacts to registry--api-cors-header string Set CORS headers in the Engine API--authorization-plugin list Authorization plugins to load--bip string Specify network bridge IP-b, --bridge string Attach containers to a network bridge--cgroup-parent string Set parent cgroup for all containers--config-file string Daemon configuration file (default "/etc/docker/daemon.json")--containerd string containerd grpc address--containerd-namespace string Containerd namespace to use (default "moby")--containerd-plugins-namespace string Containerd namespace to use for plugins (default "plugins.moby")--cpu-rt-period int Limit the CPU real-time period in microseconds for the parent cgroup for all containers--cpu-rt-runtime int Limit the CPU real-time runtime in microseconds for the parent cgroup for all containers--cri-containerd start containerd with cri--data-root string Root directory of persistent Docker state (default "/var/lib/docker")-D, --debug Enable debug mode--default-address-pool pool-options Default address pools for node specific local networks--default-cgroupns-mode string Default mode for containers cgroup namespace ("host" | "private") (default "host")--default-gateway ip Container default gateway IPv4 address--default-gateway-v6 ip Container default gateway IPv6 address--default-ipc-mode string Default mode for containers ipc ("shareable" | "private") (default "private")--default-runtime string Default OCI runtime for containers (default "runc")--default-shm-size bytes Default shm size for containers (default 64MiB)--default-ulimit ulimit Default ulimits for containers (default [])--dns list DNS server to use--dns-opt list DNS options to use--dns-search list DNS search domains to use--exec-opt list Runtime execution options--exec-root string Root directory for execution state files (default "/var/run/docker")--experimental Enable experimental features--fixed-cidr string IPv4 subnet for fixed IPs--fixed-cidr-v6 string IPv6 subnet for fixed IPs-G, --group string Group for the unix socket (default "docker")--help Print usage-H, --host list Daemon socket(s) to connect to--host-gateway-ip ip IP address that the special 'host-gateway' string in --add-host resolves to. Defaults to the IP addressof the default bridge--icc Enable inter-container communication (default true)--init Run an init in the container to forward signals and reap processes--init-path string Path to the docker-init binary--insecure-registry list Enable insecure registry communication--ip ip Default IP when binding container ports (default 0.0.0.0)--ip-forward Enable net.ipv4.ip_forward (default true)--ip-masq Enable IP masquerading (default true)--ip6tables Enable addition of ip6tables rules--iptables Enable addition of iptables rules (default true)--ipv6 Enable IPv6 networking--label list Set key=value labels to the daemon--live-restore Enable live restore of docker when containers are still running--log-driver string Default driver for container logs (default "json-file")-l, --log-level string Set the logging level ("debug"|"info"|"warn"|"error"|"fatal") (default "info")--log-opt map Default log driver options for containers (default map[])--max-concurrent-downloads int Set the max concurrent downloads for each pull (default 3)--max-concurrent-uploads int Set the max concurrent uploads for each push (default 5)--max-download-attempts int Set the max download attempts for each pull (default 5)--metrics-addr string Set default address and port to serve the metrics api on--mtu int Set the containers network MTU--network-control-plane-mtu int Network Control plane MTU (default 1500)--no-new-privileges Set no-new-privileges by default for new containers--node-generic-resource list Advertise user-defined resource--oom-score-adjust int Set the oom_score_adj for the daemon-p, --pidfile string Path to use for daemon PID file (default "/var/run/docker.pid")--raw-logs Full timestamps without ANSI coloring--registry-mirror list Preferred Docker registry mirror--rootless Enable rootless mode; typically used with RootlessKit--seccomp-profile string Path to seccomp profile--selinux-enabled Enable selinux support--shutdown-timeout int Set the default shutdown timeout (default 15)-s, --storage-driver string Storage driver to use--storage-opt list Storage driver options--swarm-default-advertise-addr string Set default address or interface for swarm advertised address--tls Use TLS; implied by --tlsverify--tlscacert string Trust certs signed only by this CA (default "/root/.docker/ca.pem")--tlscert string Path to TLS certificate file (default "/root/.docker/cert.pem")--tlskey string Path to TLS key file (default "/root/.docker/key.pem")--tlsverify Use TLS and verify the remote--userland-proxy Use userland proxy for loopback traffic (default true)--userland-proxy-path string Path to the userland proxy binary--userns-remap string User/Group setting for user namespaces-v, --version Print version information and quit[root@vm1 ~]#
日志配置
log-driver配置容器日志的默认驱动程序（默认为” json-file”）json-file驱动建议配置如下
{"log-driver": "json-file","log-opts": {"max-size": "10m","max-file": "3"}}
下载速度
max-concurrent-downloads并行镜像的连接数，用于提高镜像的下载速度（默认为3）
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