# yum install -y yum-utils device-mapper-persistent-data lvm2
# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

# yum install -y docker-ce

[root@localhost docker]# docker --version
Docker version 19.03.8, build afacb8b

{
 "icc": false,
 "log-level": "info",
 "log-driver": "json-file",
 "log-opts": {
 "max-size": "10m",
 "max-file":"5",
 "labels": "somelabel",
 "env": "os,customer"
 },
 "iptables": true,
 "userns-remap": "default",
 "userland-proxy": false,
 "experimental": false,
 "selinux-enabled": true,
 "live-restore": true,
 "no-new-privileges": true,
 "cgroup-parent": "/foobar",
 "seccomp-profile": "/etc/docker/seccomp/default-no-chmod.json",
 "tls": true,
 "tlsverify": true,
 "tlscacert": "/etc/docker/CA/ca.pem",
 "tlscert": "/etc/docker/CA/server-cert.pem",
 "tlskey": "/etc/docker/CA/server-key.pem"
}

$ openssl genrsa -out server-key.pem 4096

$ openssl req -subj "/CN=localhsot" -sha256 -new -key server-key.pem -out server.csr

$ openssl genrsa -out key.pem 4096
$ openssl req -subj '/CN=localhost' -new -key key.pem -out client.csr

$ chmod -v 0400 ca-key.pem key.pem server-key.pem
$ chmod -v 0444 ca.pem server-cert.pem cert.pem

[root@localhost CA]# ls
ca-key.pem ca.pem ca.srl cert.pem client.csr extfile.cnf key.pem server-cert.pem server.csr server-key.pem

"tls": true,
"tlsverify": true,
"tlscacert": "/etc/docker/CA/ca.pem",
"tlscert": "/etc/docker/CA/server-cert.pem",
"tlskey": "/etc/docker/CA/server-key.pem"

$ cp -v {ca,cert,key}.pem ~/.docker
$ export DOCKER_HOST=tcp://$HOST:2376 DOCKER_TLS_VERIFY=1

$ curl https://$HOST:2376/images/json  --cert ~/.docker/cert.pem  --key ~/.docker/key.pem  --cacert ~/.docker/ca.pem
 
[{"Containers":-1,"Created":1540777343,"Id":"sha256:55e7b305dc477345434ce3bd3941940481f982eea31c8f28c0670d59c63d544b","Labels":nu

[root@localhost docker]# cat /etc/subuid
dockremap:100000:65536

"log-level": "info",
"log-driver": "json-file",
"log-opts": {
 "max-size": "10m",
 "max-file":"5",
 "labels": "somelabel",
 "env": "os,customer"
},

{
 "log-driver": "fluentd",
 "log-opts": {
 "fluentd-address": "fluentdhost:24224"
 }
 }

{
 "log-driver": "syslog",
 "log-opts": {
 "syslog-address": "udp://1.2.3.4:1111"
 }
}

{
 "default-ulimits": {
 "nofile": {
  "Name": "nofile",
  "Hard": 64000,
  "Soft": 64000
 }
 }
}

https://github.com/docker/labs/blob/master/security/seccomp/seccomp-profiles/default-no-chmod.json
[root@localhost docker]# docker run --rm -it alpine sh
/ # ls bin etc lib mnt proc run srv tmp var
dev home media opt root sbin sys usr / # touch foo.sh
/ # chmod +x foo.sh
chmod: foo.sh: Operation not permitted
/ # exit

{
 "authorization-plugins": [],//访问授权插件
 "data-root": "",//docker数据持久化存储的根目录,默认为/var/lib/docker
 "dns": [],//DNS服务器
 "dns-opts": [],//DNS配置选项，如端口等
 "dns-search": [],//DNS搜索域名
 "exec-opts": [],//执行选项
 "exec-root": "",//执行状态的文件的根目录
 "experimental": false,//是否开启试验性特性
 "features": {},//启用或禁用特定功能。如：{"buildkit": true}使buildkit成为默认的docker镜像构建器。
 "storage-driver": "",//存储驱动器类型
 "storage-opts": [],//存储选项
 "labels": [],//键值对式标记docker元数据
 "live-restore": true,//dockerd挂掉是否保活容器（避免了docker服务异常而造成容器退出）
 "log-driver": "json-file",//容器日志的驱动器
 "log-opts": {
 "max-size": "10m",
 "max-file":"5",
 "labels": "somelabel",
 "env": "os,customer"
 },//容器日志的选项
 "mtu": 0,//设置容器网络MTU（最大传输单元）
 "pidfile": "",//daemon PID文件的位置
 "cluster-store": "",//集群存储系统的URL
 "cluster-store-opts": {},//配置集群存储
 "cluster-advertise": "",//对外的地址名称
 "max-concurrent-downloads": 3,//设置每个pull进程的最大并发
 "max-concurrent-uploads": 5,//设置每个push进程的最大并发
 "default-shm-size": "64M",//设置默认共享内存的大小
 "shutdown-timeout": 15,//设置关闭的超时时限
 "debug": true,//开启调试模式
 "hosts": [],//dockerd守护进程的监听地址
 "log-level": "",//日志级别
 "tls": true,//开启传输层安全协议TLS
 "tlsverify": true,//开启输层安全协议并验证远程地址
 "tlscacert": "",//CA签名文件路径
 "tlscert": "",//TLS证书文件路径
 "tlskey": "",//TLS密钥文件路径
 "swarm-default-advertise-addr": "",//swarm对外地址
 "api-cors-header": "",//设置CORS（跨域资源共享-Cross-origin resource sharing）头
 "selinux-enabled": false,//开启selinux(用户、进程、应用、文件的强制访问控制)
 "userns-remap": "",//给用户命名空间设置 用户/组
 "group": "",//docker所在组
 "cgroup-parent": "",//设置所有容器的cgroup的父类
 "default-ulimits": {
 "nofile": {
  "Name": "nofile",
  "Hard": 64000,
  "Soft": 64000
 }
 },//设置所有容器的ulimit
 "init": false,//容器执行初始化，来转发信号或控制(reap)进程
 "init-path": "/usr/libexec/docker-init",//docker-init文件的路径
 "ipv6": false,//支持IPV6网络
 "iptables": false,//开启防火墙规则
 "ip-forward": false,//开启net.ipv4.ip_forward
 "ip-masq": false,//开启ip掩蔽(IP封包通过路由器或防火墙时重写源IP地址或目的IP地址的技术)
 "userland-proxy": false,//用户空间代理
 "userland-proxy-path": "/usr/libexec/docker-proxy",//用户空间代理路径
 "ip": "0.0.0.0",//默认IP
 "bridge": "",//将容器依附(attach)到桥接网络上的桥标识
 "bip": "",//指定桥接IP
 "fixed-cidr": "",//(ipv4)子网划分，即限制ip地址分配范围，用以控制容器所属网段实现容器间(同一主机或不同主机间)的网络访问
 "fixed-cidr-v6": "",//（ipv6）子网划分
 "default-gateway": "",//默认网关
 "default-gateway-v6": "",//默认ipv6网关
 "icc": false,//容器间通信
 "raw-logs": false,//原始日志(无颜色、全时间戳)
 "allow-nondistributable-artifacts": [],//不对外分发的产品提交的registry仓库
 "registry-mirrors": [],//registry仓库镜像加速地址
 "seccomp-profile": "",//seccomp配置文件
 "insecure-registries": [],//配置非https的registry地址
 "no-new-privileges": false,//禁止新优先级
 "default-runtime": "runc",//OCI联盟(The Open Container Initiative)默认运行时环境
 "oom-score-adjust": -500,//内存溢出被杀死的优先级(-1000~1000)
 "node-generic-resources": ["NVIDIA-GPU=UUID1", "NVIDIA-GPU=UUID2"],//对外公布的资源节点
 "runtimes": {
 "cc-runtime": {
  "path": "/usr/bin/cc-runtime"
 },
 "custom": {
  "path": "/usr/local/bin/my-runc-replacement",
  "runtimeArgs": [
  "--debug"
  ]
 }
 },//运行时
 "default-address-pools":[
 {"base":"172.80.0.0/16","size":24},//默认的dhcp分配地址
 {"base":"172.90.0.0/16","size":24}
 ]
}