Installing Docker

Install Docker and deploy multiple containers to set up the Flink environment. If the server cannot connect to the Internet, configure a local yum repository according to your environment to ensure a smooth installation.

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 network in bridge mode.
```
docker network create -d bridge flink-network
```
Check whether the network is created successfully.
```
docker network ls
```

Create and start three Docker containers.

The containers have the 8c32g specification, and are named flink_jm_8c32g, flink_tm1_8c32g, and flink_tm2_8c32g. After all containers are started, the command execution process automatically exits.

docker run -it -d --name flink_jm_8c32g --cpus=8 --memory=32g --network flink-network openeuler-22.03-lts-sp4 /bin/bash 
docker run -it -d --name flink_tm1_8c32g --cpus=8 --memory=32g --network flink-network openeuler-22.03-lts-sp4 /bin/bash 
docker run -it -d --name flink_tm2_8c32g --cpus=8 --memory=32g --network flink-network openeuler-22.03-lts-sp4 /bin/bash

Query the container IDs.
```
docker ps
```
The first column in the following figure shows the container IDs.
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 5.b to 5.g.
```
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 wget libXtst
```
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 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