Installing Docker

Optional: If wget is not installed, install it first. Otherwise, skip this step.
```
yum install wget
```

Install Docker and import the basic image. For details, see Docker Installation Guide (CentOS & openEuler) .

cd /opt
wget --no-check-certificate https://mirrors.huaweicloud.com/openeuler/openEuler-22.03-LTS-SP4/docker_img/aarch64/openEuler-docker.aarch64.tar.xz
docker load < openEuler-docker.aarch64.tar.xz

Create a Docker network in bridge mode.

docker network create -d bridge flink-network

Create three Docker containers with the 8c32g specification. Name them flink_jm_8c32g, flink_tm1_8c32g, and flink_tm2_8c32g, start them, and exit.

docker run -it -d -v /usr/lib64:/usr/lib64 --name flink_jm_8c32g --privileged --cpus=8 --memory=32g --network flink-network -p 0.0.0.0:8081:8081 openeuler-22.03-lts-sp4 /bin/bash 
docker run -it -d -v /usr/lib64:/usr/lib64 --name flink_tm1_8c32g --privileged --cpus=8 --memory=32g --network flink-network openeuler-22.03-lts-sp4 /bin/bash 
docker run -it -d -v /usr/lib64:/usr/lib64 --name flink_tm2_8c32g --privileged --cpus=8 --memory=32g --network flink-network openeuler-22.03-lts-sp4 /bin/bash

Query the container IDs, which are located in the first column.
```
docker ps
```
Log in to all containers, enable the SSH service in the containers, and configure password-free login.
1. Log in to the containers in sequence and perform 6.b to 6.g in 6.
```
docker exec -it flink_jm_8c32g /bin/bash 
docker exec -it flink_tm1_8c32g /bin/bash 
docker exec -it flink_tm2_8c32g /bin/bash 
```
2. Install the SSH service dependency, password change dependency, command editing dependency, command search dependency, and network management dependency. If other dependencies are missing in the image, install them by yourself.
```
yum -y install openssh-clients openssh-server passwd vim findutils net-tools libXext libXrender gcc cmake make gcc-c++ unzip
```
3. Generate an RSA key.
```
ssh-keygen -A
```
4. Enable the SSH service in the container.
```
/usr/sbin/sshd -D &
```
5. Set a password for the container.
```
# Set the password of the current user. Remember the password.
passwd
```
6. Generate an RSA key again. When a message is displayed, press Enter.
```
ssh-keygen -t rsa
```
7. Exit from the container.
```
exit
```
8. On the flink_jm_8c32g container, enable SSH password-free login to other containers.
```
docker exec -it flink_jm_8c32g /bin/bash 
ssh-copy-id -i ~/.ssh/id_rsa.pub root@flink_tm1_8c32g
ssh-copy-id -i ~/.ssh/id_rsa.pub root@flink_tm2_8c32g
```

Parent topic: Installing the Basic Environment