Docker 基础命令介绍

ph033378

　　Docker是一种C/S结构，所以就会有客户端和服务端。Docker支持很多子命令，例如我们在命令行docker然后tab键会出来很多命令
　　当然docker工具很多，除了 docker 命令行工具，用户也可以通过 REST API 与服务器通信
Docker daemon是服务器组件，以 Linux 后台服务的方式运行。可以通过命令：systemctl status docker.service看到
Docker daemon 运行在 Docker host 上，负责创建、运行、监控容器，构建、存储镜像。
监听地址的配置：

默认docker daemon只能监听本地host，如果远程要访问，需要打开tcp监听，如下：

/etc/systemd/system/multi-user.target.wants/docker.service[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network.target docker.socket firewalld.service
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://
#上面这里如果改成这样就开启了监听远程所有端口：ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=1048576
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
TasksMax=infinity
TimeoutStartSec=0
# 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
[Install]
WantedBy=multi-user.target　　重启服务端docker
systemctl daemon-reload
systemctl restart docker.service　　调试
　　可以通过在客户端通过H参数来指定服务器和info子命令来查看服务端信息

　　这里可以看到哦啊服务端运行情况
root@d1:/etc/apt# docker -H 192.168.56.132 info
Containers: 1
Running: 0
Paused: 0
Stopped: 1
Images: 1
Server Version: 17.03.1-ce
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Backing Filesystem: extfs
Dirs: 9
Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 4ab9917febca54791c5f071a9d1f404867857fcc
runc version: 54296cf40ad8143b62dbcaa1d90e520a2136ddfe
init version: 949e6fa
Security Options:
apparmor
seccomp
  Profile: default
Kernel Version: 4.4.0-31-generic
Operating System: Ubuntu 16.04.1 LTS
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 3.842 GiB
Name: d1
ID: SQ7Y:TBJA:LS5G:IQNB:CIHC:6T2D:J22X:F3QK:7AS2:7KLN:NIIQ:JLXY
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
WARNING: No swap limit support
Experimental: false
Insecure Registries:
127.0.0.0/8
Registry Mirrors:
http://febb9aec.m.daocloud.io
Live Restore Enabled: false