Set Docker_Opts in centos

Question

I need to set docker to listen to tcp://0.0.0.0/4243 on my host machine running amazon linux (centos). All the documentation I have seen has told me to run the following command

Answer 1

I Think on CentOS, you can try setting the options as below in the file /etc/sysconfig/docker

other_args="-H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock"

Then restart the docker and try checking if the port is opening using

netstat -plt | grep 4243 

This should list if listening

Answer 2

I am working on centos 7.

I just want to add insecure-registry in docker config file then I changed "DOCKER_OPTS=--insecure-registry=...." in /etc/sysconfig/docker while it did not work.

While I saw a INSECURE_REGISTRY in the config so I changed this variable and it WORKS!

So I guess DOCKER_OPTS does not work here!

But it worked on my unbuntu 14!

It is really frustrating when using docker!

Answer 3

I cannot believe how many answers there are for this. So here is another one for:

• CentOS 7.3
• Docker Version = 17.03.1-ce, API Version = 1.27

This answer is built upon an unbelievable playing around combination of this answer and this one and this one.

1. sudo vim /usr/lib/systemd/system/docker.service
2. insert " -H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock"
3. sudo systemctl daemon-reload //refresh your file changes above
4. sudo systemctl restart docker
5. netstat -l | grep 4243 //verify port is open
6. connect to your docker host from somewhere, like Jenkins Docker Plugin, i.e. tcp://[server_ip]:4243

Answer 4

Based on https://docs.docker.com/engine/admin/configuring/

sudo mkdir /etc/systemd/system/docker.service.d
sudo vi /etc/systemd/system/docker.service.d/docker.conf

[Service]
ExecStart=
ExecStart=/usr/bin/docker daemon -H fd:// -D -H tcp://127.0.0.1:4243

sudo systemctl daemon-reload
sudo systemctl restart docker

Answer 5

1、edit /usr/lib/systemd/system/docker.service to add two param in the service section:

# vim /usr/lib/systemd/system/docker.service

[Service]

ExecStart=

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix://var/run/docker.sock

2、reload the configuration,and then restart docker。

# systemctl daemon-reload
# systemctl restart docker

3、to check for success, see if the return the following response。

# ps -ef|grep docker

root 26208 1 0 23:51 ? 00:00:00 /usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix://var/run/docker.sock

reference from Expose the Docker Remote API on Centos 7?

Answer 6

It worked for me when I followed how its shown in the posts above with drop-in replacement files in: /etc/systemd/system/docker.service.d