Question

我已经使用yum install docker安装了Docker：

$ uname -a
Linux caspgval4 3.10.0-229.20.1.el7.x86_64 #1 SMP Wed Nov 4 10:08:36 CST 2015 x86_64 x86_64 x86_64 GNU/Linux

$ docker --version
Docker version 1.12.6, build 3a094bd/1.12.6

$ docker info
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

$ sudo systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: inactive (dead)
     Docs: http://docs.docker.com

我正在尝试安装和运行Docker，但是它给出了如下错误：

$ sudo service docker start
Redirecting to /bin/systemctl start  docker.service
Failed to start docker.service: Unit not found.

如何解决此问题？我尝试了以下命令，但没有运气：

$ sudo systemctl start docker
Failed to start docker.service: Unit not found.

额外信息：

$ journalctl -u docker
No journal files were found.
-- No entries --

$ cat /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target
Wants=docker-storage-setup.service
Requires=rhel-push-plugin.socket
Requires=docker-cleanup.timer

[Service]
Type=notify
NotifyAccess=all
EnvironmentFile=-/etc/sysconfig/docker
EnvironmentFile=-/etc/sysconfig/docker-storage
EnvironmentFile=-/etc/sysconfig/docker-network
Environment=GOTRACEBACK=crash
Environment=DOCKER_HTTP_HOST_COMPAT=1
Environment=PATH=/usr/libexec/docker:/usr/bin:/usr/sbin
ExecStart=/usr/bin/dockerd-current \
          --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current \
          --default-runtime=docker-runc \
          --authorization-plugin=rhel-push-plugin \
          --exec-opt native.cgroupdriver=systemd \
          --userland-proxy-path=/usr/libexec/docker/docker-proxy-current \
          $OPTIONS \
          $DOCKER_STORAGE_OPTIONS \
          $DOCKER_NETWORK_OPTIONS \
          $ADD_REGISTRY \
          $BLOCK_REGISTRY \
          $INSECURE_REGISTRY
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=1048576
LimitNPROC=1048576
LimitCORE=infinity
TimeoutStartSec=0
Restart=on-abnormal
MountFlags=slave

[Install]
WantedBy=multi-user.target

我尝试了以下内容：

$ sudo systemctl daemon-reload
$ sudo systemctl start docker
Failed to start docker.service: Unit not found.
$ sudo journalctl -u docker
-- No entries --

更多调试信息：

$ sudo systemctl status network.target
● network.target - Network
   Loaded: loaded (/usr/lib/systemd/system/network.target; static; vendor preset: disabled)
   Active: active since Mon 2017-01-23 02:54:39 PST; 2 months 29 days ago
     Docs: man:systemd.special(7)
           http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget

Jan 23 02:54:39 mymachine systemd[1]: Starting Network.
Jan 23 02:54:39 mymachine systemd[1]: Reached target Network.

$ sudo systemctl status docker-storage-setup.service
● docker-storage-setup.service - Docker Storage Setup
   Loaded: loaded (/usr/lib/systemd/system/docker-storage-setup.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

$ sudo systemctl status rhel-push-plugin.socket
Unit rhel-push-plugin.socket could not be found.

$ sudo systemctl status docker-cleanup.timer
● docker-cleanup.timer - Run docker-cleanup every hour
   Loaded: loaded (/usr/lib/systemd/system/docker-cleanup.timer; disabled; vendor preset: disabled)
   Active: inactive (dead)

Answer 1

如果有人使用snap安装了docker，他们可以使用以下命令启动服务

sudo snap status docker #check the status
sudo snap start docker # start the service

Answer 2

看起来你错过了rhel-push-plugin.socket单元，它可能是rhel-push-plugin包的一部分。您可以尝试修复该安装，或者您可以直接从Docker安装上游Docker软件包，并以root身份安装：

curl -sSL https://get.docker.com/ | sh

上游Docker安装将是Docker的更新版本，但它不会像rhel-push-plugin那样进行各种RHEL修改。

Answer 3

https://docs.aws.amazon.com/AmazonECS/latest/developerguide/docker-basics.html

注意

在某些情况下，您可能需要重新启动实例以为ec2-user提供访问Docker守护程序的权限。如果看到以下错误，请尝试重新启动实例：

Answer 4

运行此命令以列出所有服务：

sudo systemctl list-units --type=service

寻找正确的Docker服务名称（在我的情况下为snap.docker.dockerd.service），然后运行：

sudo systemctl restart snap.docker.dockerd.service

Answer 5

尝试以root用户身份安装Docker（sudo）：

sudo yum install docker

请参阅 Installation on Red Hat Enterprise Linux 。

Answer 6

如果您的操作系统是Ubuntu，请使用以下命令，它将成功安装Docker：

apt install docker.io

无法启动Docker服务，错误＆＃34;无法启动docker.service：找不到单元。＆＃34;

6 个答案: