Docker cannot start (SystemCTL Start Docker failed)
tags: docker
Docker cannot start a fault investigation
Investigation method:
1. Confirm that the SystemCTL Start Docker command process is correct.
SystemCTL Start Docker command needs to run after the systemctl Daemon-Reload command.
2. Use the command to view the SystemCTL Status Docker to see the reason for the error. (Generally speaking, it is useless)
3. CANTOS uses command Cat/VAR/LOG/MESSAGES | GREP DOCKER to see the real error reasons.
4. Check the corresponding questions.
daemon.json configuration error
hosts configuration
The hosts configuration in Daemon.json is as follows:
"hosts":[
"tcp://127.0.0.1:2375",
"unix:///var/run/docker.sock"
],
Report an error
unable to configure the Docker daemon with file /etc/docker/daemon.json: the following directives are specified both as a flag and in the configuration file: hosts: (from flag: [fd://], from file: [tcp://127.0.0.1:2375])
reason:
After modifying the docker.daemon file, it failed to start
Hosts configuration in the Daemon.json configuration file conflicts with Docker's default startup configuration.
Docker's default startup configuration is located in:
/lib/systemd/system/docker.serviceļ¼ubuntu
/usr/lib/systemd/system/docker.serviceļ¼centos
vim /usr/lib/systemd/system/docker.service
Conflict position, -H fd: //
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
Solution
Delete -H fd: //
ExecStart=/usr/bin/dockerd --containerd=/run/containerd/containerd.sock
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