搭建Docker的API服务

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文章目录

介绍
安装
开启远程访问

介绍

利用docker提供的API访问docker 在远端操作容器的创建、部署、启动、停止等。

安装

安装Docker服务，此处不做过多介绍，参考上一个笔记。

开启远程访问

本次基于安装的Docker基本信息如下

[root@localhost ~]# docker version
Client: Docker Engine - Community
 Version:           20.10.8
 API version:       1.41
 Go version:        go1.16.6
 Git commit:        3967b7d
 Built:             Fri Jul 30 19:55:49 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.8
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.16.6
  Git commit:       75249d8
  Built:            Fri Jul 30 19:54:13 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.9
  GitCommit:        e25210fe30a0a703442421b0f60afac609f950a3
 runc:
  Version:          1.0.1
  GitCommit:        v1.0.1-0-g4144b63
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

首先编辑docker的宿主机文件 /lib/systemd/system/docker.service

修改以ExecStart开头的行

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix://var/run/docker.sock

编辑后文件内容如下：

[root@localhost ~]# cat /lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service containerd.service
Wants=network-online.target
Requires=docker.socket containerd.service

[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 tcp://0.0.0.0:2375 -H unix://var/run/docker.sock
#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
OOMScoreAdjust=-500

[Install]
WantedBy=multi-user.target

修改后保存文件，然后通知docker服务做出的修改

systemctl daemon-reload

重启docker服务

service docker restart

接下来测试一下看是否能连接到docker api。上面的2375就是对应端口

[root@localhost ~]# curl http://192.168.3.8:2375/version

{"Platform":{"Name":"Docker Engine - Community"},"Components":[{"Name":"Engine","Version":"20.10.8","Details":{"ApiVersion":"1.41","Arch":"amd64","BuildTime":"2021-07-30T19:54:13.000000000+00:00","Experimental":"false","GitCommit":"75249d8","GoVersion":"go1.16.6","KernelVersion":"3.10.0-1160.el7.x86_64","MinAPIVersion":"1.12","Os":"linux"}},{"Name":"containerd","Version":"1.4.9","Details":{"GitCommit":"e25210fe30a0a703442421b0f60afac609f950a3"}},{"Name":"runc","Version":"1.0.1","Details":{"GitCommit":"v1.0.1-0-g4144b63"}},{"Name":"docker-init","Version":"0.19.0","Details":{"GitCommit":"de40ad0"}}],"Version":"20.10.8","ApiVersion":"1.41","MinAPIVersion":"1.12","GitCommit":"75249d8","GoVersion":"go1.16.6","Os":"linux","Arch":"amd64","KernelVersion":"3.10.0-1160.el7.x86_64","BuildTime":"2021-07-30T19:54:13.000000000+00:00"}
[root@localhost ~]#

此时本级可以访问，如果其他机器访问的话可能2375端口没有开放，需要在防火墙中打开添加2375端口tcp放行。

#添加2375端口
[root@localhost ~]# firewall-cmd --permanent --zone=public --add-port=2375/tcp
success
#防火墙重启
[root@localhost ~]# firewall-cmd --reload
success
#查看开放的端口
[root@localhost ~]# firewall-cmd --permanent --zone=public --list-ports
2375/tcp

使用另外一个机器内网浏览器访问http://192.168.3.8:2375/version,此时 192.168.3.8是我的docker所在机器的ip地址

搭建Docker的API服务

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