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我们知道程序运行，通过修改命令参数或者配置文件配置项，对程序进行修改。Docker也不例外，通过docker.service 增加命令参数或者在/etc/docker/daemon.json中增加配置项均可。

推荐修改daemon.json对docker守护进程进行配置更改（方便维护）。通过dockerd --help，我们可以获知都有哪些参数，但是，daemon.json中该如何配置呢？格式如何？

以下是Linux下允许的配置选项的完整示例：

{"allow-nondistributable-artifacts": [],"api-cors-header": "","authorization-plugins": [],"bip": "","bridge": "","builder": {"gc": {"enabled": true,"defaultKeepStorage": "10GB","policy": [{ "keepStorage": "10GB", "filter": ["unused-for=2200h"] },{ "keepStorage": "50GB", "filter": ["unused-for=3300h"] },{ "keepStorage": "100GB", "all": true }]}},"cgroup-parent": "","containerd": "/run/containerd/containerd.sock","containerd-namespace": "docker","containerd-plugins-namespace": "docker-plugins","data-root": "","debug": true,"default-address-pools": [{"base": "172.30.0.0/16","size": 24},{"base": "172.31.0.0/16","size": 24}],"default-cgroupns-mode": "private","default-gateway": "","default-gateway-v6": "","default-network-opts": {},"default-runtime": "runc","default-shm-size": "64M","default-ulimits": {"nofile": {"Hard": 64000,"Name": "nofile","Soft": 64000}},"dns": [],"dns-opts": [],"dns-search": [],"exec-opts": [],"exec-root": "","experimental": false,"features": {"cdi": true,"containerd-snapshotter": true},"fixed-cidr": "","fixed-cidr-v6": "","group": "","host-gateway-ip": "","hosts": [],"proxies": {"http-proxy": "http://proxy.example.com:80","https-proxy": "https://proxy.example.com:443","no-proxy": "*.test.example.com,.example.org"},"icc": false,"init": false,"init-path": "/usr/libexec/docker-init","insecure-registries": [],"ip": "0.0.0.0","ip-forward": false,"ip-masq": false,"iptables": false,"ip6tables": false,"ipv6": false,"labels": [],"live-restore": true,"log-driver": "json-file","log-format": "text","log-level": "","log-opts": {"cache-disabled": "false","cache-max-file": "5","cache-max-size": "20m","cache-compress": "true","env": "os,customer","labels": "somelabel","max-file": "5","max-size": "10m"},"max-concurrent-downloads": 3,"max-concurrent-uploads": 5,"max-download-attempts": 5,"mtu": 0,"no-new-privileges": false,"node-generic-resources": ["NVIDIA-GPU=UUID1","NVIDIA-GPU=UUID2"],"oom-score-adjust": 0,"pidfile": "","raw-logs": false,"registry-mirrors": [],"runtimes": {"cc-runtime": {"path": "/usr/bin/cc-runtime"},"custom": {"path": "/usr/local/bin/my-runc-replacement","runtimeArgs": ["--debug"]}},"seccomp-profile": "","selinux-enabled": false,"shutdown-timeout": 15,"storage-driver": "","storage-opts": [],"swarm-default-advertise-addr": "","tls": true,"tlscacert": "","tlscert": "","tlskey": "","tlsverify": true,"userland-proxy": false,"userland-proxy-path": "/usr/libexec/docker-proxy","userns-remap": ""
}

当然，随着docker版本迭代，配置参数亦会有变更，最好还是去官网查看帮助文档：

https://docs.docker.com/reference/cli/dockerd/#daemon-configuration-file