systemctl edit docker.service

Instead of editing the service file directly. I added the following lines (the first ExecStart= clears out the default, or you will have two and the unit won’t start)
———————————————-
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H fd:// –containerd=/run/containerd/containerd.sock –insecure-registry docker.example.com:5000
———————————————–

You may also want to do ‘export SYSTEMD_EDITOR=vim’ if you don’t want nano.

You should allow port ‘5000’ in firewall as docker registry is running on 5000 port.

how do we avoid docker push from trying to use a webproxy? in /etc/profile, I have explicitly set

export no_proxy=”localhost,127.0.0.1,node2,*.local.domain”

Yet when pushing image, docker tries to resolve the hostname through webproxy

[admin@node2 ~]# cat /etc/hosts
15.12.70.46 node2 node2

# docker push node2:5000/friendlyhello
The push refers to a repository [node2:5000/friendlyhello]
983860a985da: Preparing
fc5535ef2a0b: Preparing
0bd3f73f5940: Preparing
63d42cb10c64: Preparing
32d47307f796: Preparing
c86aa07d5fdb: Waiting
d8a33133e477: Waiting
Error: Status 404 trying to push repository friendlyhello: ….
“>\nYour requested host \”node2\” could not be resolved by DNS.\n\n\n\n\n\n\n\n\n\n\nFor assistance, contact your network support team.\n\n\n\n\n\n\n”

From any of the docker Engine node, run the “docker images” command to see the images inside your registry.

Hi Nag,

Did you update your system’s ‘/usr/lib/systemd/system/docker.service’ file and reload daemon service and restart Docker service ..?

after I change “192.168.0.31 boot-node” to “192.168.0.31 boot-node boot-node” in /etc/hosts
and change “/usr/bin/dockerd –insecure-registry boot-node:5000” to “/usr/bin/dockerd –insecure-registry=boot-node:5000” for ExecStart
it starts to work

[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 –-insecure-registry boot-node:5000
ExecReload=/bin/kill -s HUP $MAINPID
# 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
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# 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
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

also I have
192.168.0.31 boot-node
in /etc/hosts