docker-machine無法啟動的解決辦法：1、使用“docker-machine ls”查看主機狀態；2、卸載現有docker，并重新安裝；3、啟動docker，并查看docker服務狀態即可。

本文操作環境：centos7系統、Docker 19.03.9版、Dell G3電腦。

如何解決docker-machine無法啟動的問題？

Centos7 docker-machine 部署docker主機 docker服務啟動失敗

背景：

計劃使用Centos7 Core 作為 docker host，搭建測試平臺，只有4臺主機，就使用Swarm方案。

環境:

安裝：

在工作desktop(Ubuntu)主機上安裝 docker-machine,可以參考https://docs.docker.com/machine/install-machine/

首先安裝 docker-host1：

docker-machine –debug create –driver generic –generic-ip-address=xxx.xxx.xxx.80 –generic-ssh-key=/home/sleeber/.ssh/id_rsa –generic-ssh-port=22 –generic-ssh-user=wntime docker-host1

安裝最后輸出，顯示docker 服務無法啟動：

sudo systemctl -f start docker SSH cmd err, output: exit status 1: Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.  Error creating machine: Error running provisioning: something went wrong running an SSH command command : sudo systemctl -f start docker err     : exit status 1 output  : Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.  notifying bugsnag: [Error creating machine: Error running provisioning: something went wrong running an SSH command command : sudo systemctl -f start docker err     : exit status 1 output  : Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details. ]

使用docker-machine ls 查看主機狀態：

:~/docker-test-env$ docker-machine ls NAME         ACTIVE   DRIVER    STATE     URL                      SWARM   DOCKER    ERRORS docker-host1   -        generic   Running   tcp://xxx.xxx.xxx.80:2376           Unknown   Unable to query docker version: Cannot connect to the docker engine endpoint

SSH到docker-host1 主機，手動啟動docker服務

sudo systemctl start docker Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.

按照提示查看狀態

 systemctl status docker.service ● docker.service - Docker Application Container Engine    Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)   Drop-In: /etc/systemd/system/docker.service.d            └─10-machine.conf    Active: failed (Result: start-limit) since Thu 2020-05-28 20:41:39 EDT; 581ms ago      Docs: https://docs.docker.com   Process: 30463 ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --storage-driver overlay2 --tlsverify --tlscacert /etc/docker/ca.pem --tlscert /etc/docker/server.pem --tlskey /etc/docker/server-key.pem --label provider=generic (code=exited, status=1/FAILURE)  Main PID: 30463 (code=exited, status=1/FAILURE)

谷歌一下： https://github.com/moby/moby/issues/33931 https://www.jianshu.com/p/bd395fdf7611 https://www.jianshu.com/p/93518610eea1

按照搜索結果看，應該是10-machine.conf引起；但是刪除了10-machine.conf文件，及文件夾還是無法啟動

$ sudo rm /etc/systemd/system/docker.service.d/10-machine.conf $ sudo systemctl start docker Failed to start docker.service: Unit is not loaded properly: Invalid argument. See system logs and 'systemctl status docker.service' for details. $ sudo rm -rf /etc/systemd/system/docker.service.d/ $ sudo systemctl start docker Failed to start docker.service: Unit is not loaded properly: Invalid argument. See system logs and 'systemctl status docker.service' for details.

使用dockerd 直接能啟動

$ sudo nohup dockerd & [1] 31419 $ nohup: ignoring input and appending output to ‘nohup.out’  $ ll total 4 -rw-------. 1 root root 2638 May 28 20:52 nohup.out $ tail -f nohup.out tail: cannot open ‘nohup.out’ for reading: Permission denied tail: no files remaining $ sudo tail -f nohup.out time="2020-05-28T20:52:56.409646032-04:00" level=warning msg="Base device already exists and has filesystem xfs on it. User specified filesystem  will be ignored." storage-driver=devicemapper time="2020-05-28T20:52:56.430282474-04:00" level=info msg="[graphdriver] using prior storage driver: devicemapper" time="2020-05-28T20:52:56.430326847-04:00" level=warning msg="[graphdriver] WARNING: the devicemapper storage-driver is deprecated, and will be removed in a future release" time="2020-05-28T20:52:56.433336530-04:00" level=warning msg="mountpoint for pids not found" time="2020-05-28T20:52:56.433595847-04:00" level=info msg="Loading containers: start." time="2020-05-28T20:52:56.529329426-04:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to set a preferred IP address" time="2020-05-28T20:52:56.558933143-04:00" level=info msg="Loading containers: done." time="2020-05-28T20:52:56.570819898-04:00" level=info msg="Docker daemon" commit=9d988398e7 graphdriver(s)=devicemapper version=19.03.9 time="2020-05-28T20:52:56.570873940-04:00" level=info msg="Daemon has completed initialization" time="2020-05-28T20:52:56.585131361-04:00" level=info msg="API listen on /var/run/docker.sock" ^C $ sudo docker version Client: Docker Engine - Community  Version:           19.03.9  API version:       1.40  Go version:        go1.13.10  Git commit:        9d988398e7  Built:             Fri May 15 00:25:27 2020  OS/Arch:           linux/amd64  Experimental:      false  Server: Docker Engine - Community  Engine:   Version:          19.03.9   API version:      1.40 (minimum version 1.12)   Go version:       go1.13.10   Git commit:       9d988398e7   Built:            Fri May 15 00:24:05 2020   OS/Arch:          linux/amd64   Experimental:     false  containerd:   Version:          1.2.13   GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429  runc:   Version:          1.0.0-rc10   GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd  docker-init:   Version:          0.18.0   GitCommit:        fec3683

使用systemctl 查看docker服務狀態還是顯示失敗

$ sudo systemctl status docker ● docker.service - Docker Application Container Engine    Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)   Drop-In: /etc/systemd/system/docker.service.d            └─10-machine.conf    Active: failed (Result: start-limit) since Thu 2020-05-28 20:49:52 EDT; 4min 59s ago      Docs: https://docs.docker.com   Process: 31051 ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --storage-driver overlay2 --tlsverify --tlscacert /etc/docker/ca.pem --tlscert /etc/docker/server.pem --tlskey /etc/docker/server-key.pem --label provider=generic (code=exited, status=1/FAILURE)  Main PID: 31051 (code=exited, status=1/FAILURE)  May 28 20:49:50 test-java2 systemd[1]: docker.service failed. May 28 20:49:52 test-java2 systemd[1]: docker.service holdoff time over, scheduling restart. May 28 20:49:52 test-java2 systemd[1]: Stopped Docker Application Container Engine. May 28 20:49:52 test-java2 systemd[1]: start request repeated too quickly for docker.service May 28 20:49:52 test-java2 systemd[1]: Failed to start Docker Application Container Engine. May 28 20:49:52 test-java2 systemd[1]: Unit docker.service entered failed state. May 28 20:49:52 test-java2 systemd[1]: docker.service failed. May 28 20:50:45 test-java2 systemd[1]: start request repeated too quickly for docker.service May 28 20:50:45 test-java2 systemd[1]: Failed to start Docker Application Container Engine. May 28 20:50:45 test-java2 systemd[1]: docker.service failed.

推斷 docker-machine 安裝docker還是有些問題，只能手動安裝

注意：卸載docker后，需要手動刪除/etc/systemd/system/docker.service.d/ 文件夾，否則新安裝的docker也是不能啟動的。

卸載現有docker，并重新安裝

sudo yum remove docker*                    docker-client                    docker-client-latest                    docker-common                    docker-latest                    docker-latest-logrotate                    docker-logrotate                    docker-engine  sudo rm -rf /etc/systemd/system/docker.service.d/  sudo yum install -y yum-utils device-mapper-persistent-data lvm2  sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo  sudo yum install -y docker-ce docker-ce-cli containerd.io

啟動docker，并查看docker服務狀態

$ sudo docker version Client: Docker Engine - Community  Version:           19.03.10  API version:       1.40  Go version:        go1.13.10  Git commit:        9424aeaee9  Built:             Thu May 28 22:18:06 2020  OS/Arch:           linux/amd64  Experimental:      false  Server: Docker Engine - Community  Engine:   Version:          19.03.10   API version:      1.40 (minimum version 1.12)   Go version:       go1.13.10   Git commit:       9424aeaee9   Built:            Thu May 28 22:16:43 2020   OS/Arch:          linux/amd64   Experimental:     false  containerd:   Version:          1.2.13   GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429  runc:   Version:          1.0.0-rc10   GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd  docker-init:   Version:          0.18.0   GitCommit:        fec3683

可以正常啟動了

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