docker not starting and failing with error , Failed to start docker.service: Unit not found

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When I am trying to start docker using the command:

sudo systemctl start docker

I am getting below error

Failed to start docker.service: Unit not found.

I tried finding some suggestions over the web to resolve this issue and followed that but it didn't solve the issue.

Cannot start docker daemon in CentOS7

This is my docker.socket file [which is just a copy-paste of one of the answer]

[Unit]
Description=Docker Socket for the API
PartOf=docker.service

[Socket]
ListenStream=/var/run/docker.sock
SocketMode=0660
SocketUser=root
SocketGroup=docker

[Install]
WantedBy=sockets.target

This is the error I am getting error while starting docker.socket

sudo systemctl start docker.socket

See "systemctl status docker.socket" and "journalctl -xe" for details.

output of "systemctl status docker.socket"

systemctl status docker.socket

systemd[1]: Socket service docker.service not loaded, refusing.
systemd[1]: Failed to listen on Docker Socket for the API.

docker version details

Client: Docker Engine - Community
 Version:           19.03.2
 API version:       1.40
 Go version:        go1.12.8
 Git commit:        6a30dfca03
 Built:             Thu Aug 29 05:26:30 2019
 OS/Arch:           linux/amd64
 Experimental:      false
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

To me, it looks like that docker.service is an issue. Could you please suggest how I can resolve it.

docker-compose docker
1 Answers

There should be a docker.service unit file at either /lib/systemd/system or /etc/systemd/system. Mine looks like what's shown below.

If you have one there, you can try to make sure it's enabled via:

sudo systemctl enable docker.service

Here's an exmaple of the docker.service unit file:

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
BindsTo=containerd.service
After=network-online.target firewalld.service containerd.service
Wants=network-online.target
Requires=docker.socket

[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 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

[Install]
WantedBy=multi-user.target
user_142675460
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