Docker command not found while docker.service is Active (running) - linux

Question

I've installed docker on CentOS 7, but when I run docker, I get bash: docker: command not found...
Other apps that require docker gave this error: "docker": executable file not found in $PATH
which docker returns: no docker in (/usr/.....
whereis docker returns: docker: /etc/docker /usr/libexec/docker /usr/share/man/man1/docker.1.gz
This is how I installed it:
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
sudo yum update -y && sudo yum install -y \
containerd.io-1.2.13 \
docker-ce-19.03.11 \
docker-ce-cli-19.03.11
mkdir /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"storage-opts": [
"overlay2.override_kernel_check=true"
]
}
EOF
sudo systemctl enable docker

Answer 1

I would recommend you to read the official documentation at docs.docker.com.
Did you successfully meet the OS requirements?
To install Docker Engine you need a maintained version of CentOS 7,
archived versions are not supported or tested.
The centos-extras repository must be activated. This repository is
activated by default, but if you deactivated it, you have to activate
it again.
The Overlay2 storage driver is recommended.
Have you deleted the older versions?
Older versions of Docker were called docker or docker-engine. If
these are installed, uninstall them, along with associated
dependencies.
$ sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
I have sent you some document texts from the official Docker documentation page, I would recommend you to read the whole document page.