DOCKER学习_001:Docker简介

 docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since Sat 2019-11-09 02:36:44 EST; 10min ago
     Docs: https://docs.docker.com
 Main PID: 62112 (dockerd)
    Tasks: 13
   Memory: 46.2M
   CGroup: /system.slice/docker.service
           └─62112 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.288676502-05:00" level=info msg="scheme \...=grpc
Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.288692565-05:00" level=info msg="ccResolv...=grpc
Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.288723178-05:00" level=info msg="ClientCo...=grpc
Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.316499988-05:00" level=info msg="Loading ...art."
Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.470346871-05:00" level=info msg="Default ...ress"
Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.525457432-05:00" level=info msg="Loading ...one."
Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.545391836-05:00" level=info msg="Docker d....03.4
Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.545511423-05:00" level=info msg="Daemon h...tion"
Nov 09 02:36:44 docker-server1 dockerd[62112]: time="2019-11-09T02:36:44.565917783-05:00" level=info msg="API list...sock"
Nov 09 02:36:44 docker-server1 systemd[1]: Started Docker Application Container Engine.
Hint: Some lines were ellipsized, use -l to show in full.

{
 "api-cors-header": "", 
 "authorization-plugins": [],
 "bip": "",
 "bridge": "",
 "cgroup-parent": "",
 "cluster-store": "",
 "cluster-store-opts": {},
 "cluster-advertise": "",
 #启用debug的模式，启用后，可以看到很多的启动信息。默认 false
 "debug": true, 
 "default-gateway": "",
 "default-gateway-v6": "",
 "default-runtime": "runc",
 "default-ulimits": {},
 "disable-legacy-registry": false,
 #容器DNS的地址，在容器的/etc/resolv.conf 文件中可查看
 "dns": ["192.168.80.1"], 
 "dns-opts": [],
 "dns-search": [],
 "exec-opts": [],
 "exec-root": "",
 "fixed-cidr": "",
 "fixed-cidr-v6": "",
 #已废弃，使用data-root代替
 "graph": "/var/lib/docker", 
 #Docker运行时使用的根路径,根路径下的内容稍后介绍，默认/var/lib/docker
 "data-root": "/var/lib/docker", 
 "group": "", #Unix套接字的属组,仅指/var/run/docker.sock 
 "hosts": [], #设置容器hosts
 "icc": false,
 "insecure-registries": [],
 "ip": "0.0.0.0",
 "iptables": false,
 "ipv6": false,
 "ip-forward": false,
 "ip-masq": false,
 "labels": ["nodeName=node-121"]
 "live-restore": true,
 "log-driver": "",
 "log-level": "",
 "log-opts": {
    "max-file": "5",
    "max-size": "50m"
 },
 "max-concurrent-downloads": 3,
 "max-concurrent-uploads": 5,
 "mtu": 0,
 "oom-score-adjust": -500,
 "pidfile": "", #Docker守护进程的PID文件
 "raw-logs": false,
 "registry-mirrors": ["xxxx"], #镜像加速的地址，增加后在 docker info 中可查看。
 "runtimes": {
 "runc": {
 "path": "runc"
 },
 "custom": {
 "path": "/usr/local/bin/my-runc-replacement",
 "runtimeArgs": [
 "--debug"
 ]
 }
 },
 "selinux-enabled": false, #参考：Docker的启动参数
 "storage-driver": "overlay2",
 "storage-opts": [],
 "swarm-default-advertise-addr": "",
 "tls": true, #参考：Docker的启动参数
 "tlscacert": "", #参考：Docker的启动参数
 "tlscert": "", #参考：Docker的启动参数
 "tlskey": "", #参考：Docker的启动参数
 "tlsverify": true, #参考：Docker的启动参数
 "userland-proxy": false,
 "userns-remap": ""
 }

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
BindsTo=containerd.service
After=network-online.target firewalld.service containerd.service
Wants=network-online.target
Requires=docker.socket

[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always

# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3

# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s

# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity

# Comment TasksMax if your systemd version does not support it.
# Only systemd 226 and above support this option.
TasksMax=infinity

# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes

# kill only the docker process, not all processes in the cgroup
KillMode=process
MountFlags=slave     # 解决目录被其它的容器挂载使用，导致已经退出的容器无法被删除的问题
[Install]
WantedBy=multi-user.target