For systems, which can't connect to Internet without a proxy
Note: If your computer or VM in which you are about to install docker is not connected to Internet directly, then you can use a http(s) proxy. This is the case with most development VMs in the corporates which are generally not exposed to the Internet. Check with your IT team and get a proxy. Once you get a proxy, set it to your VM using the following guide.
Add the following lines to your ~/.bashrc file, so that they will be set when you startup.
vi ~/.bashrcexport https_proxy=https://x.x.x.x:3128
export http_proxy=http://x.x.x.x:3128
Sometimes, (as it happened to me), the yum.conf also needs a proxy. Otherwise, you might get a timeout error. Though the curl works, you will face the issue with yum. So add the following line to your /etc/yum.conf file
proxy=http://x.x.x.x:3128
Note: Mostly, the port will be 3128. If not, check with your IT team.
Installing Docker CE on CentOS 7.5
It is recommended to do a yum update before you proceed:
sudo yum update
Here, I am going to use CentOS 7.5. You need to download Docker into it, probably using yum package manager. Most of the steps taken here are from the official guide
You need to install the following packages, before you install docker:
sudo yum install -y yum-utils \ device-mapper-persistent-data \ lvm2
Add the repo, so that you can get future updates easily.
Now, install the docker-ce
sudo yum install docker-ce
The above will install the latest docker-ce version.
Now, you are ready to go
Start the docker service
sudo systemctl start docker
Check its status:
sudo systemctl status docker
It must be active and running.
Now, you can run the hello-world.
But, again, for the systems which need proxy to be setup to connect to Internet, the following guide will help.
vi /etc/systemd/system/docker.service.d/http-proxy.conf
In the above file, write the following lines:
[Service] Environment="HTTP_PROXY=http://x.x.x.x:3128"
and again, for https proxy,
vi /etc/systemd/system/docker.service.d/https-proxy.conf[Service] Environment="HTTPS_PROXY=http://x.x.x.x:3128"
As you can see, though https proxy comes with https:// prefix, we left that to http:// only. Because, for some reason, setting to https:// did not work.
Check if the proxies are set:
systemctl show --property=Environment docker
When you run the above, you should see your proxy configuration.
If you don't see above, just do the following:
sudo systemctl daemon-reload sudo systemctl restart docker
Now, run the hello-world app
docker run hello-world
This fetches the hello-world image from the docker hub (if it is already not present) and then executes it.
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