背景说明

一般情况下，安装完docker之后可以正常启动Docker相关服务，但是当需要获取镜像时，由于默认的镜像仓库在国外，由于墙的原因，镜像下载的速度慢且不稳定，于是，我们可以将仓库改成国内的，比如阿里提供的镜像加速。

每个阿里云账号有自己的专属的加速器地址

解决方案

网页直链

https://cr.console.aliyun.com/#/accelerator

加速地址

浏览器访问地址:https://www.aliyun.com/product/acr
image.png
选择容器镜像服务ACRimage.png
选择管理控制台
image.png

配置方案

启动参数

状态查看

  1. [root@vm system]# systemctl status docker
  2. ● docker.service - Docker Application Container Engine
  3.    Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
  4.    Active: active (running) since Mon 2020-02-10 17:37:29 CST; 1h 59min ago
  5.      Docs: https://docs.docker.com
  6.  Main PID: 15256 (dockerd)
  7.    CGroup: /system.slice/docker.service
  8.            └─15256 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
  10. Feb 10 17:37:29 vm dockerd[15256]: time="2020-02-10T17:37:29.052785177+08:00" level=info msg="ClientConn switchin...e=grpc
  11. Feb 10 17:37:29 vm dockerd[15256]: time="2020-02-10T17:37:29.062543996+08:00" level=info msg="Loading containers: start."
  12. Feb 10 17:37:29 vm dockerd[15256]: time="2020-02-10T17:37:29.592241301+08:00" level=info msg="Default bridge (doc...dress"
  13. Feb 10 17:37:29 vm dockerd[15256]: time="2020-02-10T17:37:29.820389366+08:00" level=info msg="Loading containers: done."
  14. Feb 10 17:37:29 vm dockerd[15256]: time="2020-02-10T17:37:29.851582816+08:00" level=warning msg="Not using native...erlay2
  15. Feb 10 17:37:29 vm dockerd[15256]: time="2020-02-10T17:37:29.851862707+08:00" level=info msg="Docker daemon" comm...9.03.5
  16. Feb 10 17:37:29 vm dockerd[15256]: time="2020-02-10T17:37:29.851924932+08:00" level=info msg="Daemon has complete...ation"
  17. Feb 10 17:37:29 vm dockerd[15256]: time="2020-02-10T17:37:29.972226271+08:00" level=info msg="API listen on /var/....sock"
  18. Feb 10 17:37:29 vm systemd[1]: Started Docker Application Container Engine.
  19. Feb 10 19:35:53 vm systemd[1]: [/usr/lib/systemd/system/docker.service:38] Unknown lvalue 'TasksMax' in section 'Service'
  20. Hint: Some lines were ellipsized, use -l to show in full.

编辑配置
进入路径/lib/systemd/system编辑docker.service配置文件,然后找到ExecStart这项，将阿里云的加速器地址拷贝到截图这个地方。

  1. [root@vm system]# cd /lib/systemd/system
  2. [root@vm system]# ls -l |grep docker.service 
  3. -rw-r--r--. 1 root root 1683 Nov 13 15:25 docker.service
  4. [root@vm system]# vim docker.service 
  5.   9 [Service]
  6.  10 Type=notify
  7.  11 # the default is not to use systemd for cgroups because the delegate issues still
  8.  12 # exists and systemd currently does not support the cgroup feature set required
  9.  13 # for containers run by docker
  10.  14 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
  11.  15 ExecReload=/bin/kill -s HUP $MAINPID
  12.  16 TimeoutSec=0
  13.  17 RestartSec=2
  14.  18 Restart=always

编辑ExecStart属性值

  1. ExecStart=/usr/bin/dockerd --registry-mirror https://b7j3uwrc.mirror.aliyuncs.com -H fd:// --containerd=/run/containerd/containerd.sock

私有仓库[—insecure-registry 172.31.98.241:8082 ] 注意：配置需要添加在-H之前否则不生效

加载配置
配置好文件后重载配置文件

  1. [root@vm system]# systemctl daemon-reload

重启服务
启动docker

  1. [root@vm system]# systemctl restart docker

查看状态

  1. [root@vm system]# systemctl status docker
  2. ● docker.service - Docker Application Container Engine
  3.    Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
  4.    Active: active (running) since Mon 2020-02-10 19:40:45 CST; 5s ago
  5.      Docs: https://docs.docker.com
  6.  Main PID: 50570 (dockerd)
  7.    Memory: 44.0M
  8.    CGroup: /system.slice/docker.service
  9.            └─50570 /usr/bin/dockerd --registry-mirror=https://b7j3uwrc.mirror.aliyuncs.com -H fd:// --containerd=/run/containerd/containerd.sock
  11. Feb 10 19:40:44 vm dockerd[50570]: time="2020-02-10T19:40:44.451512387+08:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
  12. Feb 10 19:40:44 vm dockerd[50570]: time="2020-02-10T19:40:44.459093097+08:00" level=info msg="[graphdriver] using prior storage driver: overlay2"
  13. Feb 10 19:40:44 vm dockerd[50570]: time="2020-02-10T19:40:44.474401723+08:00" level=info msg="Loading containers: start."
  14. Feb 10 19:40:45 vm dockerd[50570]: time="2020-02-10T19:40:45.009310553+08:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0...IP address"
  15. Feb 10 19:40:45 vm dockerd[50570]: time="2020-02-10T19:40:45.241392858+08:00" level=info msg="Loading containers: done."
  16. Feb 10 19:40:45 vm dockerd[50570]: time="2020-02-10T19:40:45.276477408+08:00" level=warning msg="Not using native diff for overlay2, this may cause degraded p...er=overlay2
  17. Feb 10 19:40:45 vm dockerd[50570]: time="2020-02-10T19:40:45.276797901+08:00" level=info msg="Docker daemon" commit=633a0ea graphdriver(s)=overlay2 version=19.03.5
  18. Feb 10 19:40:45 vm dockerd[50570]: time="2020-02-10T19:40:45.276857654+08:00" level=info msg="Daemon has completed initialization"
  19. Feb 10 19:40:45 vm dockerd[50570]: time="2020-02-10T19:40:45.306857874+08:00" level=info msg="API listen on /var/run/docker.sock"
  20. Feb 10 19:40:45 vm systemd[1]: Started Docker Application Container Engine.
  21. Hint: Some lines were ellipsized, use -l to show in full.

拉取镜像

[root@vm system]# docker pull primetoninc/jdk:1.8
1.8: Pulling from primetoninc/jdk
af4b0a2388c6: Pulling fs layer

配置文件

进入目录/etc/docker/查看配置文件daemon.json，如果不存在则创建

[root@template-docker ~]# mkdir /etc/docker
[root@template-docker ~]# touch /etc/docker/daemon.json
[root@vm ~]# cd /etc/docker/

Docker服务未启动时，目录/etc/docker不存在需要手动创建

编辑配置

[root@vm docker]# echo '{"registry-mirrors": ["https://b7j3uwrc.mirror.aliyuncs.com"]}' >> /etc/docker/daemon.json
[root@vm docker]# cat daemon.json 
{"registry-mirrors": ["https://b7j3uwrc.mirror.aliyuncs.com"]}
[root@vm docker]#

加载配置
配置好文件后重载配置文件

[root@vm system]# systemctl daemon-reload

重启服务
启动docker

[root@vm system]# systemctl restart docker

配置查看

[root@vm system]# docker info
Client:
 Debug Mode: false

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 19.03.5
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Native Overlay Diff: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: b34a5c8af56e510852c35414db4c1f4fa6172339
 runc version: 3e425f80a8c931f88e6d94a8c831b9d5aa481657
 init version: fec3683
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 3.10.0-514.el7.x86_64
 Operating System: CentOS Linux 7 (Core)
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 7.624GiB
 Name: vm
 ID: WPPJ:5XPD:QSPF:UAXC:7LWX:YHDO:3VCC:3WP2:55SY:E2SC:L4PT:CQPO
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Registry Mirrors:
  https://b7j3uwrc.mirror.aliyuncs.com/
 Live Restore Enabled: false

[root@vm system]#

拉取镜像

[root@vm system]# docker pull primetoninc/jdk:1.8
1.8: Pulling from primetoninc/jdk
af4b0a2388c6: Pulling fs layer