# 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": [],//訪問授權插件
 "data-root": "",//docker數據持久化存儲的根目錄,默認為/var/lib/docker
 "dns": [],//DNS服務器
 "dns-opts": [],//DNS配置選項，如端口等
 "dns-search": [],//DNS搜索域名
 "exec-opts": [],//執行選項
 "exec-root": "",//執行狀態的文件的根目錄
 "experimental": false,//是否開啟試驗性特性
 "features": {},//啟用或禁用特定功能。如：{"buildkit": true}使buildkit成為默認的docker鏡像構建器。
 "storage-driver": "",//存儲驅動器類型
 "storage-opts": [],//存儲選項
 "labels": [],//鍵值對式標記docker元數據
 "live-restore": true,//dockerd掛掉是否?；钊萜鳎ū苊饬薲ocker服務異常而造成容器退出）
 "log-driver": "json-file",//容器日志的驅動器
 "log-opts": {
 "max-size": "10m",
 "max-file":"5",
 "labels": "somelabel",
 "env": "os,customer"
 },//容器日志的選項
 "mtu": 0,//設置容器網絡MTU（最大傳輸單元）
 "pidfile": "",//daemon PID文件的位置
 "cluster-store": "",//集群存儲系統的URL
 "cluster-store-opts": {},//配置集群存儲
 "cluster-advertise": "",//對外的地址名稱
 "max-concurrent-downloads": 3,//設置每個pull進程的最大并發
 "max-concurrent-uploads": 5,//設置每個push進程的最大并發
 "default-shm-size": "64M",//設置默認共享內存的大小
 "shutdown-timeout": 15,//設置關閉的超時時限
 "debug": true,//開啟調試模式
 "hosts": [],//dockerd守護進程的監聽地址
 "log-level": "",//日志級別
 "tls": true,//開啟傳輸層安全協議TLS
 "tlsverify": true,//開啟輸層安全協議并驗證遠程地址
 "tlscacert": "",//CA簽名文件路徑
 "tlscert": "",//TLS證書文件路徑
 "tlskey": "",//TLS密鑰文件路徑
 "swarm-default-advertise-addr": "",//swarm對外地址
 "api-cors-header": "",//設置CORS（跨域資源共享-Cross-origin resource sharing）頭
 "selinux-enabled": false,//開啟selinux(用戶、進程、應用、文件的強制訪問控制)
 "userns-remap": "",//給用戶命名空間設置 用戶/組
 "group": "",//docker所在組
 "cgroup-parent": "",//設置所有容器的cgroup的父類
 "default-ulimits": {
 "nofile": {
  "Name": "nofile",
  "Hard": 64000,
  "Soft": 64000
 }
 },//設置所有容器的ulimit
 "init": false,//容器執行初始化，來轉發信號或控制(reap)進程
 "init-path": "/usr/libexec/docker-init",//docker-init文件的路徑
 "ipv6": false,//支持IPV6網絡
 "iptables": false,//開啟防火墻規則
 "ip-forward": false,//開啟net.ipv4.ip_forward
 "ip-masq": false,//開啟ip掩蔽(IP封包通過路由器或防火墻時重寫源IP地址或目的IP地址的技術)
 "userland-proxy": false,//用戶空間代理
 "userland-proxy-path": "/usr/libexec/docker-proxy",//用戶空間代理路徑
 "ip": "0.0.0.0",//默認IP
 "bridge": "",//將容器依附(attach)到橋接網絡上的橋標識
 "bip": "",//指定橋接IP
 "fixed-cidr": "",//(ipv4)子網劃分，即限制ip地址分配范圍，用以控制容器所屬網段實現容器間(同一主機或不同主機間)的網絡訪問
 "fixed-cidr-v6": "",//（ipv6）子網劃分
 "default-gateway": "",//默認網關
 "default-gateway-v6": "",//默認ipv6網關
 "icc": false,//容器間通信
 "raw-logs": false,//原始日志(無顏色、全時間戳)
 "allow-nondistributable-artifacts": [],//不對外分發的產品提交的registry倉庫
 "registry-mirrors": [],//registry倉庫鏡像加速地址
 "seccomp-profile": "",//seccomp配置文件
 "insecure-registries": [],//配置非https的registry地址
 "no-new-privileges": false,//禁止新優先級
 "default-runtime": "runc",//OCI聯盟(The Open Container Initiative)默認運行時環境
 "oom-score-adjust": -500,//內存溢出被殺死的優先級(-1000~1000)
 "node-generic-resources": ["NVIDIA-GPU=UUID1", "NVIDIA-GPU=UUID2"],//對外公布的資源節點
 "runtimes": {
 "cc-runtime": {
  "path": "/usr/bin/cc-runtime"
 },
 "custom": {
  "path": "/usr/local/bin/my-runc-replacement",
  "runtimeArgs": [
  "--debug"
  ]
 }
 },//運行時
 "default-address-pools":[
 {"base":"172.80.0.0/16","size":24},//默認的dhcp分配地址
 {"base":"172.90.0.0/16","size":24}
 ]
}